/*
Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
For licensing, see LICENSE.md or http://ckeditor.com/license
*/
(function(){if(window.CKEDITOR&&window.CKEDITOR.dom)return;/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Contains the first and essential part of the {@link CKEDITOR}
 *		object definition.
 */

// #### Compressed Code
// Compressed code in ckeditor.js must be be updated on changes in the script.
// The Closure Compiler online service should be used when updating this manually:
// http://closure-compiler.appspot.com/

// #### Raw code
// ATTENTION: read the above "Compressed Code" notes when changing this code.

if ( !window.CKEDITOR ) {
	/**
	 * This is the API entry point. The entire CKEditor code runs under this object.
	 * @class CKEDITOR
	 * @mixins CKEDITOR.event
	 * @singleton
	 */
	window.CKEDITOR = ( function() {
		var basePathSrcPattern = /(^|.*[\\\/])ckeditor\.js(?:\?.*|;.*)?$/i;

		var CKEDITOR = {

			/**
			 * A constant string unique for each release of CKEditor. Its value
			 * is used, by default, to build the URL for all resources loaded
			 * by the editor code, guaranteeing clean cache results when
			 * upgrading.
			 *
			 * **Note:** There is [a known issue where "icons.png" does not include
			 * timestamp](https://dev.ckeditor.com/ticket/10685) and might get cached.
			 * We are working on having it fixed.
			 *
			 *		alert( CKEDITOR.timestamp ); // e.g. '87dm'
			 */
			// The production implementation contains a fixed timestamp, unique
			// for each release and generated by the releaser.
			// (Base 36 value of each component of YYMMDDHH - 4 chars total - e.g. 87bm == 08071122)
			timestamp: 'J5R9',

			/**
			 * Contains the CKEditor version number.
			 *
			 *		alert( CKEDITOR.version ); // e.g. 'CKEditor 3.4.1'
			 */
			version: '4.12.0',

			/**
			 * Contains the CKEditor revision number.
			 * The revision number is incremented automatically, following each
			 * modification to the CKEditor source code.
			 *
			 *		alert( CKEDITOR.revision ); // e.g. '3975'
			 */
			revision: '0',

			/**
			 * A 3-digit random integer, valid for the entire life of the CKEDITOR object.
			 *
			 *		alert( CKEDITOR.rnd ); // e.g. 319
			 *
			 * @property {Number}
			 */
			rnd: Math.floor( Math.random() * ( 999 /*Max*/ - 100 /*Min*/ + 1 ) ) + 100 /*Min*/,

			/**
			 * Private object used to hold core stuff. It should not be used outside of
			 * the API code as properties defined here may change at any time
			 * without notice.
			 *
			 * @private
			 */
			_: {
				pending: [],
				basePathSrcPattern: basePathSrcPattern
			},

			/**
			 * Indicates the API loading status. The following statuses are available:
			 *
			 * * **unloaded**: the API is not yet loaded.
			 * * **basic_loaded**: the basic API features are available.
			 * * **basic_ready**: the basic API is ready to load the full core code.
			 * * **loaded**: the API can be fully used.
			 *
			 * Example:
			 *
			 *		if ( CKEDITOR.status == 'loaded' ) {
			 *			// The API can now be fully used.
			 *			doSomething();
			 *		} else {
			 *			// Wait for the full core to be loaded and fire its loading.
			 *			CKEDITOR.on( 'load', doSomething );
			 *			CKEDITOR.loadFullCore && CKEDITOR.loadFullCore();
			 *		}
			 */
			status: 'unloaded',

			/**
			 * The full URL for the CKEditor installation directory.
			 * It is possible to manually provide the base path by setting a
			 * global variable named `CKEDITOR_BASEPATH`. This global variable
			 * must be set **before** the editor script loading.
			 *
			 *		alert( CKEDITOR.basePath ); // e.g. 'http://www.example.com/ckeditor/'
			 *
			 * @property {String}
			 */
			basePath: ( function() {
				// Find out the editor directory path, based on its <script> tag.
				var path = window.CKEDITOR_BASEPATH || '';

				if ( !path ) {
					var scripts = document.getElementsByTagName( 'script' );

					for ( var i = 0; i < scripts.length; i++ ) {
						var match = scripts[ i ].src.match( basePathSrcPattern );

						if ( match ) {
							path = match[ 1 ];
							break;
						}
					}
				}

				// In IE (only) the script.src string is the raw value entered in the
				// HTML source. Other browsers return the full resolved URL instead.
				if ( path.indexOf( ':/' ) == -1 && path.slice( 0, 2 ) != '//' ) {
					// Absolute path.
					if ( path.indexOf( '/' ) === 0 )
						path = location.href.match( /^.*?:\/\/[^\/]*/ )[ 0 ] + path;
					// Relative path.
					else
						path = location.href.match( /^[^\?]*\/(?:)/ )[ 0 ] + path;
				}

				if ( !path )
					throw 'The CKEditor installation path could not be automatically detected. Please set the global variable "CKEDITOR_BASEPATH" before creating editor instances.';

				return path;
			} )(),

			/**
			 * Gets the full URL for CKEditor resources. By default, URLs
			 * returned by this function contain a querystring parameter ("t")
			 * set to the {@link CKEDITOR#timestamp} value.
			 *
			 * It is possible to provide a custom implementation of this
			 * function by setting a global variable named `CKEDITOR_GETURL`.
			 * This global variable must be set **before** the editor script
			 * loading. If the custom implementation returns nothing (`==null`), the
			 * default implementation is used.
			 *
			 *		// e.g. 'http://www.example.com/ckeditor/skins/default/editor.css?t=87dm'
			 *		alert( CKEDITOR.getUrl( 'skins/default/editor.css' ) );
			 *
			 *		// e.g. 'http://www.example.com/skins/default/editor.css?t=87dm'
			 *		alert( CKEDITOR.getUrl( '/skins/default/editor.css' ) );
			 *
			 *		// e.g. 'http://www.somesite.com/skins/default/editor.css?t=87dm'
			 *		alert( CKEDITOR.getUrl( 'http://www.somesite.com/skins/default/editor.css' ) );
			 *
			 * @param {String} resource The resource whose full URL we want to get.
			 * It may be a full, absolute, or relative URL.
			 * @returns {String} The full URL.
			 */
			getUrl: function( resource ) {
				// If this is not a full or absolute path.
				if ( resource.indexOf( ':/' ) == -1 && resource.indexOf( '/' ) !== 0 )
					resource = this.basePath + resource;

				// Add the timestamp, except for directories.
				if ( this.timestamp && resource.charAt( resource.length - 1 ) != '/' && !( /[&?]t=/ ).test( resource ) )
					resource += ( resource.indexOf( '?' ) >= 0 ? '&' : '?' ) + 't=' + this.timestamp;

				return resource;
			},

			/**
			 * Specify a function to execute when the DOM is fully loaded.
			 *
			 * If called after the DOM has been initialized, the function passed in will
			 * be executed immediately.
			 *
			 * @method
			 * @todo
			 */
			domReady: ( function() {
				// Based on the original jQuery code (available under the MIT license, see LICENSE.md).

				var callbacks = [];

				function onReady() {
					try {
						// Cleanup functions for the document ready method
						if ( document.addEventListener ) {
							document.removeEventListener( 'DOMContentLoaded', onReady, false );
							executeCallbacks();
						}
						// Make sure body exists, at least, in case IE gets a little overzealous.
						else if ( document.attachEvent && document.readyState === 'complete' ) {
							document.detachEvent( 'onreadystatechange', onReady );
							executeCallbacks();
						}
					} catch ( er ) {}
				}

				function executeCallbacks() {
					var i;
					while ( ( i = callbacks.shift() ) )
						i();
				}

				return function( fn ) {
					callbacks.push( fn );

					// Catch cases where this is called after the
					// browser event has already occurred.
					if ( document.readyState === 'complete' )
						// Handle it asynchronously to allow scripts the opportunity to delay ready
						setTimeout( onReady, 1 );

					// Run below once on demand only.
					if ( callbacks.length != 1 )
						return;

					// For IE>8, Firefox, Opera and Webkit.
					if ( document.addEventListener ) {
						// Use the handy event callback
						document.addEventListener( 'DOMContentLoaded', onReady, false );

						// A fallback to window.onload, that will always work
						window.addEventListener( 'load', onReady, false );

					}
					// If old IE event model is used
					else if ( document.attachEvent ) {
						// ensure firing before onload,
						// maybe late but safe also for iframes
						document.attachEvent( 'onreadystatechange', onReady );

						// A fallback to window.onload, that will always work
						window.attachEvent( 'onload', onReady );

						// If IE and not a frame
						// continually check to see if the document is ready
						// use the trick by Diego Perini
						// http://javascript.nwbox.com/IEContentLoaded/
						var toplevel = false;

						try {
							toplevel = !window.frameElement;
						} catch ( e ) {}

						if ( document.documentElement.doScroll && toplevel ) {
							scrollCheck();
						}
					}

					function scrollCheck() {
						try {
							document.documentElement.doScroll( 'left' );
						} catch ( e ) {
							setTimeout( scrollCheck, 1 );
							return;
						}
						onReady();
					}
				};

			} )()
		};

		// Make it possible to override the "url" function with a custom
		// implementation pointing to a global named CKEDITOR_GETURL.
		var newGetUrl = window.CKEDITOR_GETURL;
		if ( newGetUrl ) {
			var originalGetUrl = CKEDITOR.getUrl;
			CKEDITOR.getUrl = function( resource ) {
				return newGetUrl.call( CKEDITOR, resource ) || originalGetUrl.call( CKEDITOR, resource );
			};
		}

		return CKEDITOR;
	} )();
}

/**
 * Function called upon loading a custom configuration file that can
 * modify the editor instance configuration ({@link CKEDITOR.editor#config}).
 * It is usually defined inside the custom configuration files that can
 * include developer defined settings.
 *
 *		// This is supposed to be placed in the config.js file.
 *		CKEDITOR.editorConfig = function( config ) {
 *			// Define changes to default configuration here. For example:
 *			config.language = 'fr';
 *			config.uiColor = '#AADC6E';
 *		};
 *
 * @method editorConfig
 * @param {CKEDITOR.config} config A configuration object containing the
 * settings defined for a {@link CKEDITOR.editor} instance up to this
 * function call. Note that not all settings may still be available. See
 * [Configuration Loading Order](https://ckeditor.com/docs/ckeditor4/latest/guide/dev_configuration.html)
 * for details.
 */

// PACKAGER_RENAME( CKEDITOR )

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Defines the {@link CKEDITOR.event} class, which serves as the
 *		base for classes and objects that require event handling features.
 */

if ( !CKEDITOR.event ) {
	/**
	 * Creates an event class instance. This constructor is rarely used, being
	 * the {@link #implementOn} function used in class prototypes directly
	 * instead.
	 *
	 * This is a base class for classes and objects that require event
	 * handling features.
	 *
	 * Do not confuse this class with {@link CKEDITOR.dom.event} which is
	 * instead used for DOM events. The CKEDITOR.event class implements the
	 * internal event system used by the CKEditor to fire API related events.
	 *
	 * @class
	 * @constructor Creates an event class instance.
	 */
	CKEDITOR.event = function() {};

	/**
	 * Implements the {@link CKEDITOR.event} features in an object.
	 *
	 *		var myObject = { message: 'Example' };
	 *		CKEDITOR.event.implementOn( myObject );
	 *
	 *		myObject.on( 'testEvent', function() {
	 *			alert( this.message );
	 *		} );
	 *		myObject.fire( 'testEvent' ); // 'Example'
	 *
	 * @static
	 * @param {Object} targetObject The object into which implement the features.
	 */
	CKEDITOR.event.implementOn = function( targetObject ) {
		var eventProto = CKEDITOR.event.prototype;

		for ( var prop in eventProto ) {
			if ( targetObject[ prop ] == null )
				targetObject[ prop ] = eventProto[ prop ];
		}
	};

	CKEDITOR.event.prototype = ( function() {
		// Returns the private events object for a given object.
		var getPrivate = function( obj ) {
				var _ = ( obj.getPrivate && obj.getPrivate() ) || obj._ || ( obj._ = {} );
				return _.events || ( _.events = {} );
			};

		var eventEntry = function( eventName ) {
				this.name = eventName;
				this.listeners = [];
			};

		eventEntry.prototype = {
			// Get the listener index for a specified function.
			// Returns -1 if not found.
			getListenerIndex: function( listenerFunction ) {
				for ( var i = 0, listeners = this.listeners; i < listeners.length; i++ ) {
					if ( listeners[ i ].fn == listenerFunction )
						return i;
				}
				return -1;
			}
		};

		// Retrieve the event entry on the event host (create it if needed).
		function getEntry( name ) {
			// Get the event entry (create it if needed).
			var events = getPrivate( this );
			return events[ name ] || ( events[ name ] = new eventEntry( name ) );
		}

		return {
			/**
			 * Predefine some intrinsic properties on a specific event name.
			 *
			 * @param {String} name The event name
			 * @param meta
			 * @param [meta.errorProof=false] Whether the event firing should catch error thrown from a per listener call.
			 */
			define: function( name, meta ) {
				var entry = getEntry.call( this, name );
				CKEDITOR.tools.extend( entry, meta, true );
			},

			/**
			 * Registers a listener to a specific event in the current object.
			 *
			 *		someObject.on( 'someEvent', function() {
			 *			alert( this == someObject );		// true
			 *		} );
			 *
			 *		someObject.on( 'someEvent', function() {
			 *			alert( this == anotherObject );		// true
			 *		}, anotherObject );
			 *
			 *		someObject.on( 'someEvent', function( event ) {
			 *			alert( event.listenerData );		// 'Example'
			 *		}, null, 'Example' );
			 *
			 *		someObject.on( 'someEvent', function() { ... } );						// 2nd called
			 *		someObject.on( 'someEvent', function() { ... }, null, null, 100 );		// 3rd called
			 *		someObject.on( 'someEvent', function() { ... }, null, null, 1 );		// 1st called
			 *
			 * @param {String} eventName The event name to which listen.
			 * @param {Function} listenerFunction The function listening to the
			 * event. A single {@link CKEDITOR.eventInfo} object instanced
			 * is passed to this function containing all the event data.
			 * @param {Object} [scopeObj] The object used to scope the listener
			 * call (the `this` object). If omitted, the current object is used.
			 * @param {Object} [listenerData] Data to be sent as the
			 * {@link CKEDITOR.eventInfo#listenerData} when calling the
			 * listener.
			 * @param {Number} [priority=10] The listener priority. Lower priority
			 * listeners are called first. Listeners with the same priority
			 * value are called in registration order.
			 * @returns {Object} An object containing the `removeListener`
			 * function, which can be used to remove the listener at any time.
			 */
			on: function( eventName, listenerFunction, scopeObj, listenerData, priority ) {
				// Create the function to be fired for this listener.
				function listenerFirer( editor, publisherData, stopFn, cancelFn ) {
					var ev = {
						name: eventName,
						sender: this,
						editor: editor,
						data: publisherData,
						listenerData: listenerData,
						stop: stopFn,
						cancel: cancelFn,
						removeListener: removeListener
					};

					var ret = listenerFunction.call( scopeObj, ev );

					return ret === false ? false : ev.data;
				}

				function removeListener() {
					me.removeListener( eventName, listenerFunction );
				}

				var event = getEntry.call( this, eventName );

				if ( event.getListenerIndex( listenerFunction ) < 0 ) {
					// Get the listeners.
					var listeners = event.listeners;

					// Fill the scope.
					if ( !scopeObj )
						scopeObj = this;

					// Default the priority, if needed.
					if ( isNaN( priority ) )
						priority = 10;

					var me = this;

					listenerFirer.fn = listenerFunction;
					listenerFirer.priority = priority;

					// Search for the right position for this new listener, based on its
					// priority.
					for ( var i = listeners.length - 1; i >= 0; i-- ) {
						// Find the item which should be before the new one.
						if ( listeners[ i ].priority <= priority ) {
							// Insert the listener in the array.
							listeners.splice( i + 1, 0, listenerFirer );
							return { removeListener: removeListener };
						}
					}

					// If no position has been found (or zero length), put it in
					// the front of list.
					listeners.unshift( listenerFirer );
				}

				return { removeListener: removeListener };
			},

			/**
			 * Similiar with {@link #on} but the listener will be called only once upon the next event firing.
			 *
			 * @see CKEDITOR.event#on
			 */
			once: function() {
				var args = Array.prototype.slice.call( arguments ),
					fn = args[ 1 ];

				args[ 1 ] = function( evt ) {
					evt.removeListener();
					return fn.apply( this, arguments );
				};

				return this.on.apply( this, args );
			},

			/**
			 * @static
			 * @property {Boolean} useCapture
			 * @todo
			 */

			/**
			 * Register event handler under the capturing stage on supported target.
			 */
			capture: function() {
				CKEDITOR.event.useCapture = 1;
				var retval = this.on.apply( this, arguments );
				CKEDITOR.event.useCapture = 0;
				return retval;
			},

			/**
			 * Fires an specific event in the object. All registered listeners are
			 * called at this point.
			 *
			 *		someObject.on( 'someEvent', function() { ... } );
			 *		someObject.on( 'someEvent', function() { ... } );
			 *		someObject.fire( 'someEvent' );				// Both listeners are called.
			 *
			 *		someObject.on( 'someEvent', function( event ) {
			 *			alert( event.data );					// 'Example'
			 *		} );
			 *		someObject.fire( 'someEvent', 'Example' );
			 *
			 * @method
			 * @param {String} eventName The event name to fire.
			 * @param {Object} [data] Data to be sent as the
			 * {@link CKEDITOR.eventInfo#data} when calling the listeners.
			 * @param {CKEDITOR.editor} [editor] The editor instance to send as the
			 * {@link CKEDITOR.eventInfo#editor} when calling the listener.
			 * @returns {Boolean/Object} A boolean indicating that the event is to be
			 * canceled, or data returned by one of the listeners.
			 */
			fire: ( function() {
				// Create the function that marks the event as stopped.
				var stopped = 0;
				var stopEvent = function() {
						stopped = 1;
					};

				// Create the function that marks the event as canceled.
				var canceled = 0;
				var cancelEvent = function() {
						canceled = 1;
					};

				return function( eventName, data, editor ) {
					// Get the event entry.
					var event = getPrivate( this )[ eventName ];

					// Save the previous stopped and cancelled states. We may
					// be nesting fire() calls.
					var previousStopped = stopped,
						previousCancelled = canceled;

					// Reset the stopped and canceled flags.
					stopped = canceled = 0;

					if ( event ) {
						var listeners = event.listeners;

						if ( listeners.length ) {
							// As some listeners may remove themselves from the
							// event, the original array length is dinamic. So,
							// let's make a copy of all listeners, so we are
							// sure we'll call all of them.
							listeners = listeners.slice( 0 );

							var retData;
							// Loop through all listeners.
							for ( var i = 0; i < listeners.length; i++ ) {
								// Call the listener, passing the event data.
								if ( event.errorProof ) {
									try {
										retData = listeners[ i ].call( this, editor, data, stopEvent, cancelEvent );
									} catch ( er ) {}
								} else {
									retData = listeners[ i ].call( this, editor, data, stopEvent, cancelEvent );
								}

								if ( retData === false )
									canceled = 1;
								else if ( typeof retData != 'undefined' )
									data = retData;

								// No further calls is stopped or canceled.
								if ( stopped || canceled )
									break;
							}
						}
					}

					var ret = canceled ? false : ( typeof data == 'undefined' ? true : data );

					// Restore the previous stopped and canceled states.
					stopped = previousStopped;
					canceled = previousCancelled;

					return ret;
				};
			} )(),

			/**
			 * Fires an specific event in the object, releasing all listeners
			 * registered to that event. The same listeners are not called again on
			 * successive calls of it or of {@link #fire}.
			 *
			 *		someObject.on( 'someEvent', function() { ... } );
			 *		someObject.fire( 'someEvent' );			// Above listener called.
			 *		someObject.fireOnce( 'someEvent' );		// Above listener called.
			 *		someObject.fire( 'someEvent' );			// No listeners called.
			 *
			 * @param {String} eventName The event name to fire.
			 * @param {Object} [data] Data to be sent as the
			 * {@link CKEDITOR.eventInfo#data} when calling the listeners.
			 * @param {CKEDITOR.editor} [editor] The editor instance to send as the
			 * {@link CKEDITOR.eventInfo#editor} when calling the listener.
			 * @returns {Boolean/Object} A booloan indicating that the event is to be
			 * canceled, or data returned by one of the listeners.
			 */
			fireOnce: function( eventName, data, editor ) {
				var ret = this.fire( eventName, data, editor );
				delete getPrivate( this )[ eventName ];
				return ret;
			},

			/**
			 * Unregisters a listener function from being called at the specified
			 * event. No errors are thrown if the listener has not been registered previously.
			 *
			 *		var myListener = function() { ... };
			 *		someObject.on( 'someEvent', myListener );
			 *		someObject.fire( 'someEvent' );					// myListener called.
			 *		someObject.removeListener( 'someEvent', myListener );
			 *		someObject.fire( 'someEvent' );					// myListener not called.
			 *
			 * @param {String} eventName The event name.
			 * @param {Function} listenerFunction The listener function to unregister.
			 */
			removeListener: function( eventName, listenerFunction ) {
				// Get the event entry.
				var event = getPrivate( this )[ eventName ];

				if ( event ) {
					var index = event.getListenerIndex( listenerFunction );
					if ( index >= 0 )
						event.listeners.splice( index, 1 );
				}
			},

			/**
			 * Remove all existing listeners on this object, for cleanup purpose.
			 */
			removeAllListeners: function() {
				var events = getPrivate( this );
				for ( var i in events )
					delete events[ i ];
			},

			/**
			 * Checks if there is any listener registered to a given event.
			 *
			 *		var myListener = function() { ... };
			 *		someObject.on( 'someEvent', myListener );
			 *		alert( someObject.hasListeners( 'someEvent' ) );	// true
			 *		alert( someObject.hasListeners( 'noEvent' ) );		// false
			 *
			 * @param {String} eventName The event name.
			 * @returns {Boolean}
			 */
			hasListeners: function( eventName ) {
				var event = getPrivate( this )[ eventName ];
				return ( event && event.listeners.length > 0 );
			}
		};
	} )();
}

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

if ( !CKEDITOR.editor ) {
	// Documented at editor.js.
	CKEDITOR.editor = function() {
		// Push this editor to the pending list. It'll be processed later once
		// the full editor code is loaded.
		CKEDITOR._.pending.push( [ this, arguments ] );

		// Call the CKEDITOR.event constructor to initialize this instance.
		CKEDITOR.event.call( this );
	};

	// Both fire and fireOnce will always pass this editor instance as the
	// "editor" param in CKEDITOR.event.fire. So, we override it to do that
	// automaticaly.
	CKEDITOR.editor.prototype.fire = function( eventName, data ) {
		if ( eventName in { instanceReady: 1, loaded: 1 } )
			this[ eventName ] = true;

		return CKEDITOR.event.prototype.fire.call( this, eventName, data, this );
	};

	CKEDITOR.editor.prototype.fireOnce = function( eventName, data ) {
		if ( eventName in { instanceReady: 1, loaded: 1 } )
			this[ eventName ] = true;

		return CKEDITOR.event.prototype.fireOnce.call( this, eventName, data, this );
	};

	// "Inherit" (copy actually) from CKEDITOR.event.
	CKEDITOR.event.implementOn( CKEDITOR.editor.prototype );
}

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Defines the {@link CKEDITOR.env} object which contains
 *		environment and browser information.
 */

if ( !CKEDITOR.env ) {
	/**
	 * Environment and browser information.
	 *
	 * @class CKEDITOR.env
	 * @singleton
	 */
	CKEDITOR.env = ( function() {
		var agent = navigator.userAgent.toLowerCase(),
			edge = agent.match( /edge[ \/](\d+.?\d*)/ ),
			trident = agent.indexOf( 'trident/' ) > -1,
			ie = !!( edge || trident );

		var env = {
			/**
			 * Indicates that CKEditor is running in Internet Explorer.
			 *
			 *		if ( CKEDITOR.env.ie )
			 *			alert( 'I\'m running in IE!' );
			 *
			 * **Note:** This property is also set to `true` if CKEditor is running
			 * in {@link #edge Microsoft Edge}.
			 *
			 * @property {Boolean}
			 */
			ie: ie,

			/**
			 * Indicates that CKEditor is running in Microsoft Edge.
			 *
			 *		if ( CKEDITOR.env.edge )
			 *			alert( 'I\'m running in Edge!' );
			 *
			 * See also {@link #ie}.
			 *
			 * @since 4.5.0
			 * @property {Boolean}
			 */
			edge: !!edge,

			/**
			 * Indicates that CKEditor is running in a WebKit-based browser, like Safari,
			 * or Blink-based browser, like Chrome.
			 *
			 *		if ( CKEDITOR.env.webkit )
			 *			alert( 'I\'m running in a WebKit browser!' );
			 *
			 * @property {Boolean}
			 */
			webkit: !ie && ( agent.indexOf( ' applewebkit/' ) > -1 ),

			/**
			 * Indicates that CKEditor is running in Adobe AIR.
			 *
			 *		if ( CKEDITOR.env.air )
			 *			alert( 'I\'m on AIR!' );
			 *
			 * @property {Boolean}
			 */
			air: ( agent.indexOf( ' adobeair/' ) > -1 ),

			/**
			 * Indicates that CKEditor is running on Macintosh.
			 *
			 *		if ( CKEDITOR.env.mac )
			 *			alert( 'I love apples!'' );
			 *
			 * @property {Boolean}
			 */
			mac: ( agent.indexOf( 'macintosh' ) > -1 ),

			/**
			 * Indicates that CKEditor is running in a Quirks Mode environment.
			 *
			 *		if ( CKEDITOR.env.quirks )
			 *			alert( 'Nooooo!' );
			 *
			 * Internet Explorer 10 introduced the _New Quirks Mode_, which is similar to the _Quirks Mode_
			 * implemented in other modern browsers and defined in the HTML5 specification. It can be handled
			 * as the Standards mode, so the value of this property will be set to `false`.
			 *
			 * The _Internet Explorer 5 Quirks_ mode which is still available in Internet Explorer 10+
			 * sets this value to `true` and {@link #version} to `7`.
			 *
			 * Read more: [IEBlog](http://blogs.msdn.com/b/ie/archive/2011/12/14/interoperable-html5-quirks-mode-in-ie10.aspx)
			 *
			 * @property {Boolean}
			 */
			quirks: ( document.compatMode == 'BackCompat' && ( !document.documentMode || document.documentMode < 10 ) ),

			/**
			 * Indicates that CKEditor is running in a mobile environemnt.
			 *
			 *		if ( CKEDITOR.env.mobile )
			 *			alert( 'I\'m running with CKEditor today!' );
			 *
			 * @deprecated
			 * @property {Boolean}
			 */
			mobile: ( agent.indexOf( 'mobile' ) > -1 ),

			/**
			 * Indicates that CKEditor is running on Apple iPhone/iPad/iPod devices.
			 *
			 *		if ( CKEDITOR.env.iOS )
			 *			alert( 'I like little apples!' );
			 *
			 * @property {Boolean}
			 */
			iOS: /(ipad|iphone|ipod)/.test( agent ),

			/**
			 * Indicates that the browser has a custom domain enabled. This has
			 * been set with `document.domain`.
			 *
			 *		if ( CKEDITOR.env.isCustomDomain() )
			 *			alert( 'I\'m in a custom domain!' );
			 *
			 * @returns {Boolean} `true` if a custom domain is enabled.
			 * @deprecated
			 */
			isCustomDomain: function() {
				if ( !this.ie )
					return false;

				var domain = document.domain,
					hostname = window.location.hostname;

				return domain != hostname && domain != ( '[' + hostname + ']' ); // IPv6 IP support (https://dev.ckeditor.com/ticket/5434)
			},

			/**
			 * Indicates that the page is running under an encrypted connection.
			 *
			 *		if ( CKEDITOR.env.secure )
			 *			alert( 'I\'m on SSL!' );
			 *
			 * @returns {Boolean} `true` if the page has an encrypted connection.
			 */
			secure: location.protocol == 'https:'
		};

		/**
		 * Indicates that CKEditor is running in a Gecko-based browser, like
		 * Firefox.
		 *
		 *		if ( CKEDITOR.env.gecko )
		 *			alert( 'I\'m riding a gecko!' );
		 *
		 * @property {Boolean}
		 */
		env.gecko = ( navigator.product == 'Gecko' && !env.webkit && !env.ie );

		/**
		 * Indicates that CKEditor is running in a Blink-based browser like Chrome.
		 *
		 *		if ( CKEDITOR.env.chrome )
		 *			alert( 'I\'m running in Chrome!' );
		 *
		 * @property {Boolean} chrome
		 */

		/**
		 * Indicates that CKEditor is running in Safari (including the mobile version).
		 *
		 *		if ( CKEDITOR.env.safari )
		 *			alert( 'I\'m on Safari!' );
		 *
		 * @property {Boolean} safari
		 */
		if ( env.webkit ) {
			if ( agent.indexOf( 'chrome' ) > -1 )
				env.chrome = true;
			else
				env.safari = true;
		}

		var version = 0;

		// Internet Explorer 6.0+
		if ( env.ie ) {
			// We use env.version for feature detection, so set it properly.
			if ( edge ) {
				version = parseFloat( edge[ 1 ] );
			} else if ( env.quirks || !document.documentMode ) {
				version = parseFloat( agent.match( /msie (\d+)/ )[ 1 ] );
			} else {
				version = document.documentMode;
			}

			// Deprecated features available just for backwards compatibility.
			env.ie9Compat = version == 9;
			env.ie8Compat = version == 8;
			env.ie7Compat = version == 7;
			env.ie6Compat = version < 7 || env.quirks;

			/**
			 * Indicates that CKEditor is running in an IE6-like environment, which
			 * includes IE6 itself as well as IE7, IE8 and IE9 in Quirks Mode.
			 *
			 * @deprecated
			 * @property {Boolean} ie6Compat
			 */

			/**
			 * Indicates that CKEditor is running in an IE7-like environment, which
			 * includes IE7 itself and IE8's IE7 Document Mode.
			 *
			 * @deprecated
			 * @property {Boolean} ie7Compat
			 */

			/**
			 * Indicates that CKEditor is running in Internet Explorer 8 on
			 * Standards Mode.
			 *
			 * @deprecated
			 * @property {Boolean} ie8Compat
			 */

			/**
			 * Indicates that CKEditor is running in Internet Explorer 9 on
			 * Standards Mode.
			 *
			 * @deprecated
			 * @property {Boolean} ie9Compat
			 */
		}

		// Gecko.
		if ( env.gecko ) {
			var geckoRelease = agent.match( /rv:([\d\.]+)/ );
			if ( geckoRelease ) {
				geckoRelease = geckoRelease[ 1 ].split( '.' );
				version = geckoRelease[ 0 ] * 10000 + ( geckoRelease[ 1 ] || 0 ) * 100 + ( geckoRelease[ 2 ] || 0 ) * 1;
			}
		}

		// Adobe AIR 1.0+
		// Checked before Safari because AIR have the WebKit rich text editor
		// features from Safari 3.0.4, but the version reported is 420.
		if ( env.air )
			version = parseFloat( agent.match( / adobeair\/(\d+)/ )[ 1 ] );

		// WebKit 522+ (Safari 3+)
		if ( env.webkit )
			version = parseFloat( agent.match( / applewebkit\/(\d+)/ )[ 1 ] );

		/**
		 * Contains the browser version.
		 *
		 * For Gecko-based browsers (like Firefox) it contains the revision
		 * number with first three parts concatenated with a padding zero
		 * (e.g. for revision 1.9.0.2 we have 10900).
		 *
		 * For WebKit-based browsers (like Safari and Chrome) it contains the
		 * WebKit build version (e.g. 522).
		 *
		 * For IE browsers, it matches the "Document Mode".
		 *
		 *		if ( CKEDITOR.env.ie && CKEDITOR.env.version <= 6 )
		 *			alert( 'Ouch!' );
		 *
		 * @property {Number}
		 */
		env.version = version;

		/**
		 * Since CKEditor 4.5.0 this property is a blacklist of browsers incompatible with CKEditor. It means that it is
		 * set to `false` only in browsers that are known to be incompatible. Before CKEditor 4.5.0 this
		 * property was a whitelist of browsers that were known to be compatible with CKEditor.
		 *
		 * The reason for this change is the rising fragmentation of the browser market (especially the mobile segment).
		 * It became too complicated to check in which new environments CKEditor is going to work.
		 *
		 * In order to enable CKEditor 4.4.x and below in unsupported environments see the
		 * {@glink guide/dev_unsupported_environments Enabling CKEditor in Unsupported Environments} article.
		 *
		 *		if ( CKEDITOR.env.isCompatible )
		 *			alert( 'Your browser is not known to be incompatible with CKEditor!' );
		 *
		 * @property {Boolean}
		 */
		env.isCompatible =
			// IE 7+ (IE 7 is not supported, but IE Compat Mode is and it is recognized as IE7).
			!( env.ie && version < 7 ) &&
			// Firefox 4.0+.
			!( env.gecko && version < 40000 ) &&
			// Chrome 6+, Safari 5.1+, iOS 5+.
			!( env.webkit && version < 534 );

		/**
		 * Indicates that CKEditor is running in the HiDPI environment.
		 *
		 *		if ( CKEDITOR.env.hidpi )
		 *			alert( 'You are using a screen with high pixel density.' );
		 *
		 * @property {Boolean}
		 */
		env.hidpi = window.devicePixelRatio >= 2;

		/**
		 * Indicates that CKEditor is running in a browser which uses a bogus
		 * `<br>` filler in order to correctly display caret in empty blocks.
		 *
		 * @since 4.3.0
		 * @property {Boolean}
		 */
		env.needsBrFiller = env.gecko || env.webkit || ( env.ie && version > 10 );

		/**
		 * Indicates that CKEditor is running in a browser which needs a
		 * non-breaking space filler in order to correctly display caret in empty blocks.
		 *
		 * @since 4.3.0
		 * @property {Boolean}
		 */
		env.needsNbspFiller = env.ie && version < 11;

		/**
		 * A CSS class that denotes the browser where CKEditor runs and is appended
		 * to the HTML element that contains the editor. It makes it easier to apply
		 * browser-specific styles to editor instances.
		 *
		 *		myDiv.className = CKEDITOR.env.cssClass;
		 *
		 * @property {String}
		 */
		env.cssClass = 'cke_browser_' + ( env.ie ? 'ie' : env.gecko ? 'gecko' : env.webkit ? 'webkit' : 'unknown' );

		if ( env.quirks )
			env.cssClass += ' cke_browser_quirks';

		if ( env.ie )
			env.cssClass += ' cke_browser_ie' + ( env.quirks ? '6 cke_browser_iequirks' : env.version );

		if ( env.air )
			env.cssClass += ' cke_browser_air';

		if ( env.iOS )
			env.cssClass += ' cke_browser_ios';

		if ( env.hidpi )
			env.cssClass += ' cke_hidpi';

		return env;
	} )();
}

// PACKAGER_RENAME( CKEDITOR.env )
// PACKAGER_RENAME( CKEDITOR.env.ie )

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Contains the second part of the {@link CKEDITOR} object
 *		definition, which defines the basic editor features to be available in
 *		the root ckeditor_basic.js file.
 */

if ( CKEDITOR.status == 'unloaded' ) {
	( function() {
		CKEDITOR.event.implementOn( CKEDITOR );

		/**
		 * Forces the full CKEditor core code, in the case only the basic code has been
		 * loaded (`ckeditor_basic.js`). This method self-destroys (becomes undefined) in
		 * the first call or as soon as the full code is available.
		 *
		 *		// Check if the full core code has been loaded and load it.
		 *		if ( CKEDITOR.loadFullCore )
		 *			CKEDITOR.loadFullCore();
		 *
		 * @member CKEDITOR
		 */
		CKEDITOR.loadFullCore = function() {
			// If the basic code is not ready, just mark it to be loaded.
			if ( CKEDITOR.status != 'basic_ready' ) {
				CKEDITOR.loadFullCore._load = 1;
				return;
			}

			// Destroy this function.
			delete CKEDITOR.loadFullCore;

			// Append the script to the head.
			var script = document.createElement( 'script' );
			script.type = 'text/javascript';
			script.src = CKEDITOR.basePath + 'ckeditor.js';

			document.getElementsByTagName( 'head' )[ 0 ].appendChild( script );
		};

		/**
		 * The time to wait (in seconds) to load the full editor code after the
		 * page load, if the "ckeditor_basic" file is used. If set to zero, the
		 * editor is loaded on demand, as soon as an instance is created.
		 *
		 * This value must be set on the page before the page load completion.
		 *
		 *		// Loads the full source after five seconds.
		 *		CKEDITOR.loadFullCoreTimeout = 5;
		 *
		 * @property
		 * @member CKEDITOR
		 */
		CKEDITOR.loadFullCoreTimeout = 0;

		// Documented at ckeditor.js.
		CKEDITOR.add = function( editor ) {
			// For now, just put the editor in the pending list. It will be
			// processed as soon as the full code gets loaded.
			var pending = this._.pending || ( this._.pending = [] );
			pending.push( editor );
		};

		( function() {
			var onload = function() {
					var loadFullCore = CKEDITOR.loadFullCore,
						loadFullCoreTimeout = CKEDITOR.loadFullCoreTimeout;

					if ( !loadFullCore )
						return;

					CKEDITOR.status = 'basic_ready';

					if ( loadFullCore && loadFullCore._load )
						loadFullCore();
					else if ( loadFullCoreTimeout ) {
						setTimeout( function() {
							if ( CKEDITOR.loadFullCore )
								CKEDITOR.loadFullCore();
						}, loadFullCoreTimeout * 1000 );
					}
				};

			CKEDITOR.domReady( onload );
		} )();

		CKEDITOR.status = 'basic_loaded';
	} )();
}

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Defines {@link CKEDITOR#verbosity} and binary flags {@link CKEDITOR#VERBOSITY_WARN} and
 * {@link CKEDITOR#VERBOSITY_ERROR}. Defines also the {@link CKEDITOR#error} and {@link CKEDITOR#warn} functions
 * and the default handler for the {@link CKEDITOR#log} event.
 */

/* global console */

'use strict';

/**
 * Warning reporting verbosity level. When {@link CKEDITOR#verbosity} is set to this value, only {@link CKEDITOR#warn}
 * messages will be output to the console. It is a binary flag so it might be combined with
 * the {@link CKEDITOR#VERBOSITY_ERROR} flag.
 *
 * @since 4.5.4
 * @readonly
 * @property {Number} [=1]
 * @member CKEDITOR
 */
CKEDITOR.VERBOSITY_WARN = 1;

/**
 * Error reporting verbosity level. When {@link CKEDITOR#verbosity} is set to this value, only {@link CKEDITOR#error}
 * messages will be output to the console. It is a binary flag so it might be combined with
 * the {@link CKEDITOR#VERBOSITY_WARN} flag.
 *
 * @since 4.5.4
 * @readonly
 * @property {Number} [=2]
 * @member CKEDITOR
 */
CKEDITOR.VERBOSITY_ERROR = 2;

/**
 * Verbosity of {@link CKEDITOR#error} and {@link CKEDITOR#warn} methods. Accepts binary flags
 * {@link CKEDITOR#VERBOSITY_WARN} and {@link CKEDITOR#VERBOSITY_ERROR}.
 *
 * 			CKEDITOR.verbosity = 0; // No console output after CKEDITOR.warn and CKEDITOR.error methods.
 * 			CKEDITOR.verbosity = CKEDITOR.VERBOSITY_WARN; // Console output after CKEDITOR.warn only.
 * 			CKEDITOR.verbosity = CKEDITOR.VERBOSITY_ERROR; // Console output after CKEDITOR.error only.
 * 			CKEDITOR.verbosity = CKEDITOR.VERBOSITY_WARN | CKEDITOR.VERBOSITY_ERROR; // Console output after both methods.
 *
 * Default value enables both {@link CKEDITOR#VERBOSITY_WARN} and {@link CKEDITOR#VERBOSITY_ERROR}.
 *
 * @since 4.5.4
 * @member CKEDITOR
 * @type {Number}
 */
CKEDITOR.verbosity = CKEDITOR.VERBOSITY_WARN | CKEDITOR.VERBOSITY_ERROR;

/**
 * Warning reporting function. When {@link CKEDITOR#verbosity} has the {@link CKEDITOR#VERBOSITY_WARN} flag set, it fires
 * the {@link CKEDITOR#log} event with type set to `warn`. Fired event contains also provided `errorCode` and `additionalData`.
 *
 * @since 4.5.4
 * @member CKEDITOR
 * @param {String} errorCode Error code describing reported problem.
 * @param {Object} [additionalData] Additional data associated with reported problem.
 */
CKEDITOR.warn = function( errorCode, additionalData ) {
	if ( CKEDITOR.verbosity & CKEDITOR.VERBOSITY_WARN ) {
		CKEDITOR.fire( 'log', { type: 'warn', errorCode: errorCode, additionalData: additionalData } );
	}
};

/**
 * Error reporting function. When {@link CKEDITOR#verbosity} has {@link CKEDITOR#VERBOSITY_ERROR} flag set, it fires
 * {@link CKEDITOR#log} event with the type set to `error`. The fired event also contains the provided `errorCode` and
 * `additionalData`.
 *
 * @since 4.5.4
 * @member CKEDITOR
 * @param {String} errorCode Error code describing the reported problem.
 * @param {Object} [additionalData] Additional data associated with the reported problem.
 */
CKEDITOR.error = function( errorCode, additionalData ) {
	if ( CKEDITOR.verbosity & CKEDITOR.VERBOSITY_ERROR ) {
		CKEDITOR.fire( 'log', { type: 'error', errorCode: errorCode, additionalData: additionalData } );
	}
};

/**
 * Fired by {@link CKEDITOR#warn} and {@link CKEDITOR#error} methods.
 * Default listener logs provided information to the console.
 *
 * This event can be used to provide a custom error/warning handler:
 *
 * 			CKEDTIOR.on( 'log', function( evt ) {
 *			    	// Cancel default listener.
 *					evt.cancel();
 *					// Log event data.
 *					console.log( evt.data.type, evt.data.errorCode, evt.data.additionalData );
 * 			} );
 *
 * @since 4.5.4
 * @event log
 * @member CKEDITOR
 * @param data
 * @param {String} data.type Log type. Can be `error` or `warn`.
 * @param {String} data.errorCode Error code describing the reported problem.
 * @param {Object} [data.additionalData] Additional data associated with this log event.
 */
CKEDITOR.on( 'log', function( evt ) {
	if ( !window.console || !window.console.log ) {
		return;
	}

	var type = console[ evt.data.type ] ? evt.data.type : 'log',
		errorCode = evt.data.errorCode,
		additionalData = evt.data.additionalData,
		prefix = '[CKEDITOR] ',
		errorCodeLabel = 'Error code: ';

	if ( additionalData ) {
		console[ type ]( prefix + errorCodeLabel + errorCode + '.', additionalData );
	} else {
		console[ type ]( prefix + errorCodeLabel + errorCode + '.' );
	}

	console[ type ]( prefix + 'For more information about this error go to https://ckeditor.com/docs/ckeditor4/latest/guide/dev_errors.html#' + errorCode );
}, null, null, 999 );

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Defines the {@link CKEDITOR.dom} object, which contains DOM
 *		manipulation objects and function.
 */

CKEDITOR.dom = {};

// PACKAGER_RENAME( CKEDITOR.dom )

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Defines the {@link CKEDITOR.tools} object that contains
 *		utility functions.
 */

( function() {
	var functions = [],
		cssVendorPrefix =
			CKEDITOR.env.gecko ? '-moz-' :
			CKEDITOR.env.webkit ? '-webkit-' :
			CKEDITOR.env.ie ? '-ms-' :
			'',
		ampRegex = /&/g,
		gtRegex = />/g,
		ltRegex = /</g,
		quoteRegex = /"/g,
		tokenCharset = 'abcdefghijklmnopqrstuvwxyz0123456789',
		TOKEN_COOKIE_NAME = 'ckCsrfToken',
		TOKEN_LENGTH = 40,

		allEscRegex = /&(lt|gt|amp|quot|nbsp|shy|#\d{1,5});/g,
		namedEntities = {
			lt: '<',
			gt: '>',
			amp: '&',
			quot: '"',
			nbsp: '\u00a0',
			shy: '\u00ad'
		},
		allEscDecode = function( match, code ) {
			if ( code[ 0 ] == '#' ) {
				return String.fromCharCode( parseInt( code.slice( 1 ), 10 ) );
			} else {
				return namedEntities[ code ];
			}
		};

	CKEDITOR.on( 'reset', function() {
		functions = [];
	} );

	/**
	 * Utility functions.
	 *
	 * @class
	 * @singleton
	 */
	CKEDITOR.tools = {
		/**
		 * Compares the elements of two arrays.
		 *
		 *		var a = [ 1, 'a', 3 ];
		 *		var b = [ 1, 3, 'a' ];
		 *		var c = [ 1, 'a', 3 ];
		 *		var d = [ 1, 'a', 3, 4 ];
		 *
		 *		alert( CKEDITOR.tools.arrayCompare( a, b ) );  // false
		 *		alert( CKEDITOR.tools.arrayCompare( a, c ) );  // true
		 *		alert( CKEDITOR.tools.arrayCompare( a, d ) );  // false
		 *
		 * @param {Array} arrayA An array to be compared.
		 * @param {Array} arrayB The other array to be compared.
		 * @returns {Boolean} `true` if the arrays have the same length and
		 * their elements match.
		 */
		arrayCompare: function( arrayA, arrayB ) {
			if ( !arrayA && !arrayB )
				return true;

			if ( !arrayA || !arrayB || arrayA.length != arrayB.length )
				return false;

			for ( var i = 0; i < arrayA.length; i++ ) {
				if ( arrayA[ i ] != arrayB[ i ] )
					return false;
			}

			return true;
		},

		/**
		 * Finds the index of the first element in an array for which the `compareFunction` returns `true`.
		 *
		 *		CKEDITOR.tools.getIndex( [ 1, 2, 4, 3, 5 ], function( el ) {
		 *			return el >= 3;
		 *		} ); // 2
		 *
		 * @since 4.5.0
		 * @param {Array} array Array to search in.
		 * @param {Function} compareFunction Compare function.
		 * @returns {Number} The index of the first matching element or `-1` if none matches.
		 */
		getIndex: function( arr, compareFunction ) {
			for ( var i = 0; i < arr.length; ++i ) {
				if ( compareFunction( arr[ i ] ) )
					return i;
			}
			return -1;
		},

		/**
		 * Creates a deep copy of an object.
		 *
		 * **Note**: Recursive references are not supported.
		 *
		 *		var obj = {
		 *			name: 'John',
		 *			cars: {
		 *				Mercedes: { color: 'blue' },
		 *				Porsche: { color: 'red' }
		 *			}
		 *		};
		 *		var clone = CKEDITOR.tools.clone( obj );
		 *		clone.name = 'Paul';
		 *		clone.cars.Porsche.color = 'silver';
		 *
		 *		alert( obj.name );					// 'John'
		 *		alert( clone.name );				// 'Paul'
		 *		alert( obj.cars.Porsche.color );	// 'red'
		 *		alert( clone.cars.Porsche.color );	// 'silver'
		 *
		 * @param {Object} object The object to be cloned.
		 * @returns {Object} The object clone.
		 */
		clone: function( obj ) {
			var clone;

			// Array.
			if ( obj && ( obj instanceof Array ) ) {
				clone = [];

				for ( var i = 0; i < obj.length; i++ )
					clone[ i ] = CKEDITOR.tools.clone( obj[ i ] );

				return clone;
			}

			// "Static" types.
			if ( obj === null || ( typeof obj != 'object' ) || ( obj instanceof String ) || ( obj instanceof Number ) || ( obj instanceof Boolean ) || ( obj instanceof Date ) || ( obj instanceof RegExp ) )
				return obj;

			// DOM objects and window.
			if ( obj.nodeType || obj.window === obj )
				return obj;

			// Objects.
			clone = new obj.constructor();

			for ( var propertyName in obj ) {
				var property = obj[ propertyName ];
				clone[ propertyName ] = CKEDITOR.tools.clone( property );
			}

			return clone;
		},

		/**
		 * Turns the first letter of a string to upper-case.
		 *
		 * @param {String} str
		 * @param {Boolean} [keepCase] Keep the case of 2nd to last letter.
		 * @returns {String}
		 */
		capitalize: function( str, keepCase ) {
			return str.charAt( 0 ).toUpperCase() + ( keepCase ? str.slice( 1 ) : str.slice( 1 ).toLowerCase() );
		},

		/**
		 * Copies the properties from one object to another. By default, properties
		 * already present in the target object **are not** overwritten.
		 *
		 *		// Create the sample object.
		 *		var myObject = {
		 *			prop1: true
		 *		};
		 *
		 *		// Extend the above object with two properties.
		 *		CKEDITOR.tools.extend( myObject, {
		 *			prop2: true,
		 *			prop3: true
		 *		} );
		 *
		 *		// Alert 'prop1', 'prop2' and 'prop3'.
		 *		for ( var p in myObject )
		 *			alert( p );
		 *
		 * @param {Object} target The object to be extended.
		 * @param {Object...} source The object(s) from properties will be
		 * copied. Any number of objects can be passed to this function.
		 * @param {Boolean} [overwrite] If `true` is specified, it indicates that
		 * properties already present in the target object could be
		 * overwritten by subsequent objects.
		 * @param {Object} [properties] Only properties within the specified names
		 * list will be received from the source object.
		 * @returns {Object} The extended object (target).
		 */
		extend: function( target ) {
			var argsLength = arguments.length,
				overwrite, propertiesList;

			if ( typeof ( overwrite = arguments[ argsLength - 1 ] ) == 'boolean' )
				argsLength--;
			else if ( typeof ( overwrite = arguments[ argsLength - 2 ] ) == 'boolean' ) {
				propertiesList = arguments[ argsLength - 1 ];
				argsLength -= 2;
			}

			for ( var i = 1; i < argsLength; i++ ) {
				var source = arguments[ i ] || {};

				CKEDITOR.tools.array.forEach( CKEDITOR.tools.object.keys( source ), function( propertyName ) {
					// Only copy existed fields if in overwrite mode.
					if ( overwrite === true || target[ propertyName ] == null ) {
						// Only copy specified fields if list is provided.
						if ( !propertiesList || ( propertyName in propertiesList ) )
							target[ propertyName ] = source[ propertyName ];
					}

				} );
			}

			return target;
		},

		/**
		 * Creates an object which is an instance of a class whose prototype is a
		 * predefined object. All properties defined in the source object are
		 * automatically inherited by the resulting object, including future
		 * changes to it.
		 *
		 * @param {Object} source The source object to be used as the prototype for
		 * the final object.
		 * @returns {Object} The resulting copy.
		 */
		prototypedCopy: function( source ) {
			var copy = function() {};
			copy.prototype = source;
			return new copy();
		},

		/**
		 * Makes fast (shallow) copy of an object.
		 * This method is faster than {@link #clone} which does
		 * a deep copy of an object (including arrays).
		 *
		 * @since 4.1.0
		 * @param {Object} source The object to be copied.
		 * @returns {Object} Copy of `source`.
		 */
		copy: function( source ) {
			var obj = {},
				name;

			for ( name in source )
				obj[ name ] = source[ name ];

			return obj;
		},

		/**
		 * Checks if an object is an Array.
		 *
		 *		alert( CKEDITOR.tools.isArray( [] ) );		// true
		 *		alert( CKEDITOR.tools.isArray( 'Test' ) );	// false
		 *
		 * @param {Object} object The object to be checked.
		 * @returns {Boolean} `true` if the object is an Array, otherwise `false`.
		 */
		isArray: function( object ) {
			return Object.prototype.toString.call( object ) == '[object Array]';
		},

		/**
		 * Whether the object contains no properties of its own.
		 *
		 * @param object
		 * @returns {Boolean}
		 */
		isEmpty: function( object ) {
			for ( var i in object ) {
				if ( object.hasOwnProperty( i ) )
					return false;
			}
			return true;
		},

		/**
		 * Generates an object or a string containing vendor-specific and vendor-free CSS properties.
		 *
		 *		CKEDITOR.tools.cssVendorPrefix( 'border-radius', '0', true );
		 *		// On Firefox: '-moz-border-radius:0;border-radius:0'
		 *		// On Chrome: '-webkit-border-radius:0;border-radius:0'
		 *
		 * @param {String} property The CSS property name.
		 * @param {String} value The CSS value.
		 * @param {Boolean} [asString=false] If `true`, then the returned value will be a CSS string.
		 * @returns {Object/String} The object containing CSS properties or its stringified version.
		 */
		cssVendorPrefix: function( property, value, asString ) {
			if ( asString )
				return cssVendorPrefix + property + ':' + value + ';' + property + ':' + value;

			var ret = {};
			ret[ property ] = value;
			ret[ cssVendorPrefix + property ] = value;

			return ret;
		},

		/**
		 * Transforms a CSS property name to its relative DOM style name.
		 *
		 *		alert( CKEDITOR.tools.cssStyleToDomStyle( 'background-color' ) );	// 'backgroundColor'
		 *		alert( CKEDITOR.tools.cssStyleToDomStyle( 'float' ) );				// 'cssFloat'
		 *
		 * @method
		 * @param {String} cssName The CSS property name.
		 * @returns {String} The transformed name.
		 */
		cssStyleToDomStyle: ( function() {
			var test = document.createElement( 'div' ).style;

			var cssFloat = ( typeof test.cssFloat != 'undefined' ) ? 'cssFloat' : ( typeof test.styleFloat != 'undefined' ) ? 'styleFloat' : 'float';

			return function( cssName ) {
				if ( cssName == 'float' )
					return cssFloat;
				else {
					return cssName.replace( /-./g, function( match ) {
						return match.substr( 1 ).toUpperCase();
					} );
				}
			};
		} )(),

		/**
		 * Builds a HTML snippet from a set of `<style>/<link>`.
		 *
		 * @param {String/Array} css Each of which are URLs (absolute) of a CSS file or
		 * a trunk of style text.
		 * @returns {String}
		 */
		buildStyleHtml: function( css ) {
			css = [].concat( css );
			var item,
				retval = [];
			for ( var i = 0; i < css.length; i++ ) {
				if ( ( item = css[ i ] ) ) {
					// Is CSS style text ?
					if ( /@import|[{}]/.test( item ) )
						retval.push( '<style>' + item + '</style>' );
					else
						retval.push( '<link type="text/css" rel=stylesheet href="' + item + '">' );
				}
			}
			return retval.join( '' );
		},

		/**
		 * Replaces special HTML characters in a string with their relative HTML
		 * entity values.
		 *
		 *		alert( CKEDITOR.tools.htmlEncode( 'A > B & C < D' ) ); // 'A &gt; B &amp; C &lt; D'
		 *
		 * @param {String} text The string to be encoded.
		 * @returns {String} The encoded string.
		 */
		htmlEncode: function( text ) {
			// Backwards compatibility - accept also non-string values (casting is done below).
			// Since 4.4.8 we return empty string for null and undefined because these values make no sense.
			if ( text === undefined || text === null ) {
				return '';
			}

			return String( text ).replace( ampRegex, '&amp;' ).replace( gtRegex, '&gt;' ).replace( ltRegex, '&lt;' );
		},

		/**
		 * Decodes HTML entities that browsers tend to encode when used in text nodes.
		 *
		 *		alert( CKEDITOR.tools.htmlDecode( '&lt;a &amp; b &gt;' ) ); // '<a & b >'
		 *
		 * Read more about chosen entities in the [research](https://dev.ckeditor.com/ticket/13105#comment:8).
		 *
		 * @param {String} The string to be decoded.
		 * @returns {String} The decoded string.
		 */
		htmlDecode: function( text ) {
			// See:
			// * https://dev.ckeditor.com/ticket/13105#comment:8 and comment:9,
			// * http://jsperf.com/wth-is-going-on-with-jsperf JSPerf has some serious problems, but you can observe
			// that combined regexp tends to be quicker (except on V8). It will also not be prone to fail on '&amp;lt;'
			// (see https://dev.ckeditor.com/ticket/13105#DXWTF:CKEDITOR.tools.htmlEnDecodeAttr).
			return text.replace( allEscRegex, allEscDecode );
		},

		/**
		 * Replaces special HTML characters in HTMLElement attribute with their relative HTML entity values.
		 *
		 *		alert( CKEDITOR.tools.htmlEncodeAttr( '<a " b >' ) ); // '&lt;a &quot; b &gt;'
		 *
		 * @param {String} The attribute value to be encoded.
		 * @returns {String} The encoded value.
		 */
		htmlEncodeAttr: function( text ) {
			return CKEDITOR.tools.htmlEncode( text ).replace( quoteRegex, '&quot;' );
		},

		/**
		 * Decodes HTML entities that browsers tend to encode when used in attributes.
		 *
		 *		alert( CKEDITOR.tools.htmlDecodeAttr( '&lt;a &quot; b&gt;' ) ); // '<a " b>'
		 *
		 * Since CKEditor 4.5.0 this method simply executes {@link #htmlDecode} which covers
		 * all necessary entities.
		 *
		 * @param {String} text The text to be decoded.
		 * @returns {String} The decoded text.
		 */
		htmlDecodeAttr: function( text ) {
			return CKEDITOR.tools.htmlDecode( text );
		},

		/**
		 * Transforms text to valid HTML: creates paragraphs, replaces tabs with non-breaking spaces etc.
		 *
		 * @since 4.5.0
		 * @param {String} text Text to transform.
		 * @param {Number} enterMode Editor {@link CKEDITOR.config#enterMode Enter mode}.
		 * @returns {String} HTML generated from the text.
		 */
		transformPlainTextToHtml: function( text, enterMode ) {
			var isEnterBrMode = enterMode == CKEDITOR.ENTER_BR,
				// CRLF -> LF
				html = this.htmlEncode( text.replace( /\r\n/g, '\n' ) );

			// Tab -> &nbsp x 4;
			html = html.replace( /\t/g, '&nbsp;&nbsp; &nbsp;' );

			var paragraphTag = enterMode == CKEDITOR.ENTER_P ? 'p' : 'div';

			// Two line-breaks create one paragraphing block.
			if ( !isEnterBrMode ) {
				var duoLF = /\n{2}/g;
				if ( duoLF.test( html ) ) {
					var openTag = '<' + paragraphTag + '>', endTag = '</' + paragraphTag + '>';
					html = openTag + html.replace( duoLF, function() {
						return endTag + openTag;
					} ) + endTag;
				}
			}

			// One <br> per line-break.
			html = html.replace( /\n/g, '<br>' );

			// Compensate padding <br> at the end of block, avoid loosing them during insertion.
			if ( !isEnterBrMode ) {
				html = html.replace( new RegExp( '<br>(?=</' + paragraphTag + '>)' ), function( match ) {
					return CKEDITOR.tools.repeat( match, 2 );
				} );
			}

			// Preserve spaces at the ends, so they won't be lost after insertion (merged with adjacent ones).
			html = html.replace( /^ | $/g, '&nbsp;' );

			// Finally, preserve whitespaces that are to be lost.
			html = html.replace( /(>|\s) /g, function( match, before ) {
				return before + '&nbsp;';
			} ).replace( / (?=<)/g, '&nbsp;' );

			return html;
		},

		/**
		 * Gets a unique number for this CKEDITOR execution session. It returns
		 * consecutive numbers starting from 1.
		 *
		 *		alert( CKEDITOR.tools.getNextNumber() ); // (e.g.) 1
		 *		alert( CKEDITOR.tools.getNextNumber() ); // 2
		 *
		 * @method
		 * @returns {Number} A unique number.
		 */
		getNextNumber: ( function() {
			var last = 0;
			return function() {
				return ++last;
			};
		} )(),

		/**
		 * Gets a unique ID for CKEditor interface elements. It returns a
		 * string with the "cke_" prefix and a consecutive number.
		 *
		 *		alert( CKEDITOR.tools.getNextId() ); // (e.g.) 'cke_1'
		 *		alert( CKEDITOR.tools.getNextId() ); // 'cke_2'
		 *
		 * @returns {String} A unique ID.
		 */
		getNextId: function() {
			return 'cke_' + this.getNextNumber();
		},

		/**
		 * Gets a universally unique ID. It returns a random string
		 * compliant with ISO/IEC 11578:1996, without dashes, with the "e" prefix to
		 * make sure that the ID does not start with a number.
		 *
		 * @returns {String} A global unique ID.
		 */
		getUniqueId: function() {
			var uuid = 'e'; // Make sure that id does not start with number.
			for ( var i = 0; i < 8; i++ ) {
				uuid += Math.floor( ( 1 + Math.random() ) * 0x10000 ).toString( 16 ).substring( 1 );
			}
			return uuid;
		},

		/**
		 * Creates a function override.
		 *
		 *		var obj = {
		 *			myFunction: function( name ) {
		 *				alert( 'Name: ' + name );
		 *			}
		 *		};
		 *
		 *		obj.myFunction = CKEDITOR.tools.override( obj.myFunction, function( myFunctionOriginal ) {
		 *			return function( name ) {
		 *				alert( 'Overriden name: ' + name );
		 *				myFunctionOriginal.call( this, name );
		 *			};
		 *		} );
		 *
		 * @param {Function} originalFunction The function to be overridden.
		 * @param {Function} functionBuilder A function that returns the new
		 * function. The original function reference will be passed to this function.
		 * @returns {Function} The new function.
		 */
		override: function( originalFunction, functionBuilder ) {
			var newFn = functionBuilder( originalFunction );
			newFn.prototype = originalFunction.prototype;
			return newFn;
		},

		/**
		 * Executes a function after a specified delay.
		 *
		 *		CKEDITOR.tools.setTimeout( function() {
		 *			alert( 'Executed after 2 seconds' );
		 *		}, 2000 );
		 *
		 * @param {Function} func The function to be executed.
		 * @param {Number} [milliseconds=0] The amount of time (in milliseconds) to wait
		 * to fire the function execution.
		 * @param {Object} [scope=window] The object to store the function execution scope
		 * (the `this` object).
		 * @param {Object/Array} [args] A single object, or an array of objects, to
		 * pass as argument to the function.
		 * @param {Object} [ownerWindow=window] The window that will be used to set the
		 * timeout.
		 * @returns {Object} A value that can be used to cancel the function execution.
		 */
		setTimeout: function( func, milliseconds, scope, args, ownerWindow ) {
			if ( !ownerWindow )
				ownerWindow = window;

			if ( !scope )
				scope = ownerWindow;

			return ownerWindow.setTimeout( function() {
				if ( args )
					func.apply( scope, [].concat( args ) );
				else
					func.apply( scope );
			}, milliseconds || 0 );
		},

		/**
		 * Creates a {@link CKEDITOR.tools.buffers.throttle throttle buffer} instance.
		 *
		 * See the {@link CKEDITOR.tools.buffers.throttle#method-input input method's} documentation for example listings.
		 *
		 * @since 4.10.0
		 * @inheritdoc CKEDITOR.tools.buffers.throttle#method-constructor
		 * @returns {CKEDITOR.tools.buffers.throttle}
		 */
		throttle: function( minInterval, output, contextObj ) {
			return new this.buffers.throttle( minInterval, output, contextObj );
		},

		/**
		 * Removes spaces from the start and the end of a string. The following
		 * characters are removed: space, tab, line break, line feed.
		 *
		 *		alert( CKEDITOR.tools.trim( '  example ' ); // 'example'
		 *
		 * @method
		 * @param {String} str The text from which the spaces will be removed.
		 * @returns {String} The modified string without the boundary spaces.
		 */
		trim: ( function() {
			// We are not using \s because we don't want "non-breaking spaces" to be caught.
			var trimRegex = /(?:^[ \t\n\r]+)|(?:[ \t\n\r]+$)/g;
			return function( str ) {
				return str.replace( trimRegex, '' );
			};
		} )(),

		/**
		 * Removes spaces from the start (left) of a string. The following
		 * characters are removed: space, tab, line break, line feed.
		 *
		 *		alert( CKEDITOR.tools.ltrim( '  example ' ); // 'example '
		 *
		 * @method
		 * @param {String} str The text from which the spaces will be removed.
		 * @returns {String} The modified string excluding the removed spaces.
		 */
		ltrim: ( function() {
			// We are not using \s because we don't want "non-breaking spaces" to be caught.
			var trimRegex = /^[ \t\n\r]+/g;
			return function( str ) {
				return str.replace( trimRegex, '' );
			};
		} )(),

		/**
		 * Removes spaces from the end (right) of a string. The following
		 * characters are removed: space, tab, line break, line feed.
		 *
		 *		alert( CKEDITOR.tools.ltrim( '  example ' ); // '  example'
		 *
		 * @method
		 * @param {String} str The text from which spaces will be removed.
		 * @returns {String} The modified string excluding the removed spaces.
		 */
		rtrim: ( function() {
			// We are not using \s because we don't want "non-breaking spaces" to be caught.
			var trimRegex = /[ \t\n\r]+$/g;
			return function( str ) {
				return str.replace( trimRegex, '' );
			};
		} )(),

		/**
		 * Returns the index of an element in an array.
		 *
		 *		var letters = [ 'a', 'b', 0, 'c', false ];
		 *		alert( CKEDITOR.tools.indexOf( letters, '0' ) );		// -1 because 0 !== '0'
		 *		alert( CKEDITOR.tools.indexOf( letters, false ) );		// 4 because 0 !== false
		 *
		 * @param {Array} array The array to be searched.
		 * @param {Object/Function} value The element to be found. This can be an
		 * evaluation function which receives a single parameter call for
		 * each entry in the array, returning `true` if the entry matches.
		 * @returns {Number} The (zero-based) index of the first entry that matches
		 * the entry, or `-1` if not found.
		 */
		indexOf: function( array, value ) {
			if ( typeof value == 'function' ) {
				for ( var i = 0, len = array.length; i < len; i++ ) {
					if ( value( array[ i ] ) )
						return i;
				}
			} else if ( array.indexOf )
				return array.indexOf( value );
			else {
				for ( i = 0, len = array.length; i < len; i++ ) {
					if ( array[ i ] === value )
						return i;
				}
			}
			return -1;
		},

		/**
		 * Returns the index of an element in an array.
		 *
		 *		var obj = { prop: true };
		 *		var letters = [ 'a', 'b', 0, obj, false ];
		 *
		 *		alert( CKEDITOR.tools.indexOf( letters, '0' ) ); // null
		 *		alert( CKEDITOR.tools.indexOf( letters, function( value ) {
		 *			// Return true when passed value has property 'prop'.
		 *			return value && 'prop' in value;
		 *		} ) );											// obj
		 *
		 * @param {Array} array The array to be searched.
		 * @param {Object/Function} value The element to be found. Can be an
		 * evaluation function which receives a single parameter call for
		 * each entry in the array, returning `true` if the entry matches.
		 * @returns Object The value that was found in an array.
		 */
		search: function( array, value ) {
			var index = CKEDITOR.tools.indexOf( array, value );
			return index >= 0 ? array[ index ] : null;
		},

		/**
		 * Creates a function that will always execute in the context of a
		 * specified object.
		 *
		 *		var obj = { text: 'My Object' };
		 *
		 *		function alertText() {
		 *			alert( this.text );
		 *		}
		 *
		 *		var newFunc = CKEDITOR.tools.bind( alertText, obj );
		 *		newFunc(); // Alerts 'My Object'.
		 *
		 * @param {Function} func The function to be executed.
		 * @param {Object} obj The object to which the execution context will be bound.
		 * @returns {Function} The function that can be used to execute the
		 * `func` function in the context of `obj`.
		 */
		bind: function( func, obj ) {
			return function() {
				return func.apply( obj, arguments );
			};
		},

		/**
		 * Class creation based on prototype inheritance which supports of the
		 * following features:
		 *
		 * * Static fields
		 * * Private fields
		 * * Public (prototype) fields
		 * * Chainable base class constructor
		 *
		 * @param {Object} definition The class definition object.
		 * @returns {Function} A class-like JavaScript function.
		 */
		createClass: function( definition ) {
			var $ = definition.$,
				baseClass = definition.base,
				privates = definition.privates || definition._,
				proto = definition.proto,
				statics = definition.statics;

			// Create the constructor, if not present in the definition.
			!$ && ( $ = function() {
				baseClass && this.base.apply( this, arguments );
			} );

			if ( privates ) {
				var originalConstructor = $;
				$ = function() {
					// Create (and get) the private namespace.
					var _ = this._ || ( this._ = {} );

					// Make some magic so "this" will refer to the main
					// instance when coding private functions.
					for ( var privateName in privates ) {
						var priv = privates[ privateName ];

						_[ privateName ] = ( typeof priv == 'function' ) ? CKEDITOR.tools.bind( priv, this ) : priv;
					}

					originalConstructor.apply( this, arguments );
				};
			}

			if ( baseClass ) {
				$.prototype = this.prototypedCopy( baseClass.prototype );
				$.prototype.constructor = $;
				// Super references.
				$.base = baseClass;
				$.baseProto = baseClass.prototype;
				// Super constructor.
				$.prototype.base = function baseClassConstructor() {
					this.base = baseClass.prototype.base;
					baseClass.apply( this, arguments );
					this.base = baseClassConstructor;
				};
			}

			if ( proto )
				this.extend( $.prototype, proto, true );

			if ( statics )
				this.extend( $, statics, true );

			return $;
		},

		/**
		 * Creates a function reference that can be called later using
		 * {@link #callFunction}. This approach is especially useful to
		 * make DOM attribute function calls to JavaScript-defined functions.
		 *
		 *		var ref = CKEDITOR.tools.addFunction( function() {
		 *			alert( 'Hello!');
		 *		} );
		 *		CKEDITOR.tools.callFunction( ref ); // 'Hello!'
		 *
		 * @param {Function} fn The function to be executed on call.
		 * @param {Object} [scope] The object to have the context on `fn` execution.
		 * @returns {Number} A unique reference to be used in conjuction with
		 * {@link #callFunction}.
		 */
		addFunction: function( fn, scope ) {
			return functions.push( function() {
				return fn.apply( scope || this, arguments );
			} ) - 1;
		},

		/**
		 * Removes the function reference created with {@link #addFunction}.
		 *
		 * @param {Number} ref The function reference created with
		 * {@link #addFunction}.
		 */
		removeFunction: function( ref ) {
			functions[ ref ] = null;
		},

		/**
		 * Executes a function based on the reference created with {@link #addFunction}.
		 *
		 *		var ref = CKEDITOR.tools.addFunction( function() {
		 *			alert( 'Hello!');
		 *		} );
		 *		CKEDITOR.tools.callFunction( ref ); // 'Hello!'
		 *
		 * @param {Number} ref The function reference created with {@link #addFunction}.
		 * @param {Mixed} params Any number of parameters to be passed to the executed function.
		 * @returns {Mixed} The return value of the function.
		 */
		callFunction: function( ref ) {
			var fn = functions[ ref ];
			return fn && fn.apply( window, Array.prototype.slice.call( arguments, 1 ) );
		},

		/**
		 * Appends the `px` length unit to the size value if it is missing.
		 *
		 *		var cssLength = CKEDITOR.tools.cssLength;
		 *		cssLength( 42 );		// '42px'
		 *		cssLength( '42' );		// '42px'
		 *		cssLength( '42px' );	// '42px'
		 *		cssLength( '42%' );		// '42%'
		 *		cssLength( 'bold' );	// 'bold'
		 *		cssLength( false );		// ''
		 *		cssLength( NaN );		// ''
		 *
		 * @method
		 * @param {Number/String/Boolean} length
		 */
		cssLength: ( function() {
			var pixelRegex = /^-?\d+\.?\d*px$/,
				lengthTrimmed;

			return function( length ) {
				lengthTrimmed = CKEDITOR.tools.trim( length + '' ) + 'px';

				if ( pixelRegex.test( lengthTrimmed ) )
					return lengthTrimmed;
				else
					return length || '';
			};
		} )(),

		/**
		 * Converts the specified CSS length value to the calculated pixel length inside this page.
		 *
		 * Since 4.11.0 it also returns negative values.
		 *
		 * **Note:** Percentage-based value is left intact.
		 *
		 * @method
		 * @param {String} cssLength CSS length value.
		 * @returns {Number/String} A number representing the length in pixels or a string with a percentage value.
		 */
		convertToPx: ( function() {
			var calculator;

			return function( cssLength ) {
				if ( !calculator ) {
					calculator = CKEDITOR.dom.element.createFromHtml( '<div style="position:absolute;left:-9999px;' +
						'top:-9999px;margin:0px;padding:0px;border:0px;"' +
						'></div>', CKEDITOR.document );
					CKEDITOR.document.getBody().append( calculator );
				}

				if ( !( /%$/ ).test( cssLength ) ) {
					var isNegative = parseFloat( cssLength ) < 0,
						ret;

					if ( isNegative ) {
						cssLength = cssLength.replace( '-', '' );
					}

					calculator.setStyle( 'width', cssLength );
					ret = calculator.$.clientWidth;

					if ( isNegative ) {
						return -ret;
					}
					return ret;
				}

				return cssLength;
			};
		} )(),

		/**
		 * String specified by `str` repeats `times` times.
		 *
		 * @param {String} str
		 * @param {Number} times
		 * @returns {String}
		 */
		repeat: function( str, times ) {
			return new Array( times + 1 ).join( str );
		},

		/**
		 * Returns the first successfully executed return value of a function that
		 * does not throw any exception.
		 *
		 * @param {Function...} fn
		 * @returns {Mixed}
		 */
		tryThese: function() {
			var returnValue;
			for ( var i = 0, length = arguments.length; i < length; i++ ) {
				var lambda = arguments[ i ];
				try {
					returnValue = lambda();
					break;
				} catch ( e ) {}
			}
			return returnValue;
		},

		/**
		 * Generates a combined key from a series of params.
		 *
		 *		var key = CKEDITOR.tools.genKey( 'key1', 'key2', 'key3' );
		 *		alert( key ); // 'key1-key2-key3'.
		 *
		 * @param {String} subKey One or more strings used as subkeys.
		 * @returns {String}
		 */
		genKey: function() {
			return Array.prototype.slice.call( arguments ).join( '-' );
		},

		/**
		 * Creates a "deferred" function which will not run immediately,
		 * but rather runs as soon as the interpreter’s call stack is empty.
		 * Behaves much like `window.setTimeout` with a delay.
		 *
		 * **Note:** The return value of the original function will be lost.
		 *
		 * @param {Function} fn The callee function.
		 * @returns {Function} The new deferred function.
		 */
		defer: function( fn ) {
			return function() {
				var args = arguments,
					self = this;
				window.setTimeout( function() {
					fn.apply( self, args );
				}, 0 );
			};
		},

		/**
		 * Normalizes CSS data in order to avoid differences in the style attribute.
		 *
		 * @param {String} styleText The style data to be normalized.
		 * @param {Boolean} [nativeNormalize=false] Parse the data using the browser.
		 * @returns {String} The normalized value.
		 */
		normalizeCssText: function( styleText, nativeNormalize ) {
			var props = [],
				name,
				parsedProps = CKEDITOR.tools.parseCssText( styleText, true, nativeNormalize );

			for ( name in parsedProps )
				props.push( name + ':' + parsedProps[ name ] );

			props.sort();

			return props.length ? ( props.join( ';' ) + ';' ) : '';
		},

		/**
		 * Finds and converts `rgb(x,x,x)` color definition to hexadecimal notation.
		 *
		 * @param {String} styleText The style data (or just a string containing RGB colors) to be converted.
		 * @returns {String} The style data with RGB colors converted to hexadecimal equivalents.
		 */
		convertRgbToHex: function( styleText ) {
			return styleText.replace( /(?:rgb\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\))/gi, function( match, red, green, blue ) {
				var color = [ red, green, blue ];
				// Add padding zeros if the hex value is less than 0x10.
				for ( var i = 0; i < 3; i++ )
					color[ i ] = ( '0' + parseInt( color[ i ], 10 ).toString( 16 ) ).slice( -2 );
				return '#' + color.join( '' );
			} );
		},

		/**
		 * Normalizes hexadecimal notation so that the color string is always 6 characters long and lowercase.
		 *
		 * @param {String} styleText The style data (or just a string containing hex colors) to be converted.
		 * @returns {String} The style data with hex colors normalized.
		 */
		normalizeHex: function( styleText ) {
			return styleText.replace( /#(([0-9a-f]{3}){1,2})($|;|\s+)/gi, function( match, hexColor, hexColorPart, separator ) {
				var normalizedHexColor = hexColor.toLowerCase();
				if ( normalizedHexColor.length == 3 ) {
					var parts = normalizedHexColor.split( '' );
					normalizedHexColor = [ parts[ 0 ], parts[ 0 ], parts[ 1 ], parts[ 1 ], parts[ 2 ], parts[ 2 ] ].join( '' );
				}
				return '#' + normalizedHexColor + separator;
			} );
		},

		/**
		 * Turns inline style text properties into one hash.
		 *
		 * @param {String} styleText The style data to be parsed.
		 * @param {Boolean} [normalize=false] Normalize properties and values
		 * (e.g. trim spaces, convert to lower case).
		 * @param {Boolean} [nativeNormalize=false] Parse the data using the browser.
		 * @returns {Object} The object containing parsed properties.
		 */
		parseCssText: function( styleText, normalize, nativeNormalize ) {
			var retval = {};

			if ( nativeNormalize ) {
				// Injects the style in a temporary span object, so the browser parses it,
				// retrieving its final format.
				var temp = new CKEDITOR.dom.element( 'span' );
				styleText = temp.setAttribute( 'style', styleText ).getAttribute( 'style' ) || '';
			}

			// Normalize colors.
			if ( styleText ) {
				styleText = CKEDITOR.tools.normalizeHex( CKEDITOR.tools.convertRgbToHex( styleText ) );
			}

			// IE will leave a single semicolon when failed to parse the style text. (https://dev.ckeditor.com/ticket/3891)
			if ( !styleText || styleText == ';' )
				return retval;

			styleText.replace( /&quot;/g, '"' ).replace( /\s*([^:;\s]+)\s*:\s*([^;]+)\s*(?=;|$)/g, function( match, name, value ) {
				if ( normalize ) {
					name = name.toLowerCase();
					// Drop extra whitespacing from font-family.
					if ( name == 'font-family' )
						value = value.replace( /\s*,\s*/g, ',' );
					value = CKEDITOR.tools.trim( value );
				}

				retval[ name ] = value;
			} );
			return retval;
		},

		/**
		 * Serializes the `style name => value` hash to a style text.
		 *
		 *		var styleObj = CKEDITOR.tools.parseCssText( 'color: red; border: none' );
		 *		console.log( styleObj.color ); // -> 'red'
		 *		CKEDITOR.tools.writeCssText( styleObj ); // -> 'color:red; border:none'
		 *		CKEDITOR.tools.writeCssText( styleObj, true ); // -> 'border:none; color:red'
		 *
		 * @since 4.1.0
		 * @param {Object} styles The object contaning style properties.
		 * @param {Boolean} [sort] Whether to sort CSS properties.
		 * @returns {String} The serialized style text.
		 */
		writeCssText: function( styles, sort ) {
			var name,
				stylesArr = [];

			for ( name in styles )
				stylesArr.push( name + ':' + styles[ name ] );

			if ( sort )
				stylesArr.sort();

			return stylesArr.join( '; ' );
		},

		/**
		 * Compares two objects.
		 *
		 * **Note:** This method performs shallow, non-strict comparison.
		 *
		 * @since 4.1.0
		 * @param {Object} left
		 * @param {Object} right
		 * @param {Boolean} [onlyLeft] Check only the properties that are present in the `left` object.
		 * @returns {Boolean} Whether objects are identical.
		 */
		objectCompare: function( left, right, onlyLeft ) {
			var name;

			if ( !left && !right )
				return true;
			if ( !left || !right )
				return false;

			for ( name in left ) {
				if ( left[ name ] != right[ name ] )
					return false;

			}

			if ( !onlyLeft ) {
				for ( name in right ) {
					if ( left[ name ] != right[ name ] )
						return false;
				}
			}

			return true;
		},

		/**
		 * @inheritdoc CKEDITOR.tools.object#keys
		 * @since 4.1.0
		 * @deprecated 4.12.0 Use {@link CKEDITOR.tools.object#keys} instead.
		 */
		objectKeys: function( obj ) {
			return CKEDITOR.tools.object.keys( obj );
		},

		/**
		 * Converts an array to an object by rewriting array items
		 * to object properties.
		 *
		 *		var arr = [ 'foo', 'bar', 'foo' ];
		 *		console.log( CKEDITOR.tools.convertArrayToObject( arr ) );
		 *		// -> { foo: true, bar: true }
		 *		console.log( CKEDITOR.tools.convertArrayToObject( arr, 1 ) );
		 *		// -> { foo: 1, bar: 1 }
		 *
		 * @since 4.1.0
		 * @param {Array} arr The array to be converted to an object.
		 * @param [fillWith=true] Set each property of an object to `fillWith` value.
		 */
		convertArrayToObject: function( arr, fillWith ) {
			var obj = {};

			if ( arguments.length == 1 )
				fillWith = true;

			for ( var i = 0, l = arr.length; i < l; ++i )
				obj[ arr[ i ] ] = fillWith;

			return obj;
		},

		/**
		 * Tries to fix the `document.domain` of the current document to match the
		 * parent window domain, avoiding "Same Origin" policy issues.
		 * This is an Internet Explorer only requirement.
		 *
		 * @since 4.1.2
		 * @returns {Boolean} `true` if the current domain is already good or if
		 * it has been fixed successfully.
		 */
		fixDomain: function() {
			var domain;

			while ( 1 ) {
				try {
					// Try to access the parent document. It throws
					// "access denied" if restricted by the "Same Origin" policy.
					domain = window.parent.document.domain;
					break;
				} catch ( e ) {
					// Calculate the value to set to document.domain.
					domain = domain ?

						// If it is not the first pass, strip one part of the
						// name. E.g.  "test.example.com"  => "example.com"
						domain.replace( /.+?(?:\.|$)/, '' ) :

						// In the first pass, we'll handle the
						// "document.domain = document.domain" case.
						document.domain;

					// Stop here if there is no more domain parts available.
					if ( !domain )
						break;

					document.domain = domain;
				}
			}

			return !!domain;
		},

		/**
		 * Creates an {@link CKEDITOR.tools.buffers.event events buffer} instance.
		 *
		 * See the {@link CKEDITOR.tools.buffers.event#method-input input method's} documentation for example code listings.
		 *
		 * @since 4.2.1
		 * @inheritdoc CKEDITOR.tools.buffers.event#method-constructor
		 * @returns {CKEDITOR.tools.buffers.event}
		 */
		eventsBuffer: function( minInterval, output, contextObj ) {
			return new this.buffers.event( minInterval, output, contextObj );
		},

		/**
		 * Enables HTML5 elements for older browsers (IE8) in the passed document.
		 *
		 * In IE8 this method can also be executed on a document fragment.
		 *
		 * **Note:** This method has to be used in the `<head>` section of the document.
		 *
		 * @since 4.3.0
		 * @param {Object} doc Native `Document` or `DocumentFragment` in which the elements will be enabled.
		 * @param {Boolean} [withAppend] Whether to append created elements to the `doc`.
		 */
		enableHtml5Elements: function( doc, withAppend ) {
			var els = 'abbr,article,aside,audio,bdi,canvas,data,datalist,details,figcaption,figure,footer,header,hgroup,main,mark,meter,nav,output,progress,section,summary,time,video'.split( ',' ),
				i = els.length,
				el;

			while ( i-- ) {
				el = doc.createElement( els[ i ] );
				if ( withAppend )
					doc.appendChild( el );
			}
		},

		/**
		 * Checks if any of the `arr` items match the provided regular expression.
		 *
		 * @param {Array} arr The array whose items will be checked.
		 * @param {RegExp} regexp The regular expression.
		 * @returns {Boolean} Returns `true` for the first occurrence of the search pattern.
		 * @since 4.4.0
		 */
		checkIfAnyArrayItemMatches: function( arr, regexp ) {
			for ( var i = 0, l = arr.length; i < l; ++i ) {
				if ( arr[ i ].match( regexp ) )
					return true;
			}
			return false;
		},

		/**
		 * Checks if any of the `obj` properties match the provided regular expression.
		 *
		 * @param obj The object whose properties will be checked.
		 * @param {RegExp} regexp The regular expression.
		 * @returns {Boolean} Returns `true` for the first occurrence of the search pattern.
		 * @since 4.4.0
		 */
		checkIfAnyObjectPropertyMatches: function( obj, regexp ) {
			for ( var i in obj ) {
				if ( i.match( regexp ) )
					return true;
			}
			return false;
		},

		/**
		 * Converts a keystroke to its string representation. Returns exactly the same
		 * members as {@link #keystrokeToArray}, but the returned object contains strings of
		 * keys joined with "+" rather than an array of keystrokes.
		 *
		 * ```javascript
		 * var lang = editor.lang.common.keyboard;
		 * var shortcut = CKEDITOR.tools.keystrokeToString( lang, CKEDITOR.CTRL + 88 );
		 * console.log( shortcut.display ); // 'Ctrl + X', on Mac '⌘ + X'.
		 * console.log( shortcut.aria ); // 'Ctrl + X', on Mac 'Cmd + X'.
		 * ```
		 *
		 * @since 4.6.0
		 * @param {Object} lang A language object with the key name translation.
		 * @param {Number} keystroke The keystroke to convert.
		 * @returns {Object} See {@link #keystrokeToArray}.
		 * @returns {String} return.display
		 * @returns {String} return.aria
		 */
		keystrokeToString: function( lang, keystroke ) {
			var ret = this.keystrokeToArray( lang, keystroke );

			ret.display = ret.display.join( '+' );
			ret.aria = ret.aria.join( '+' );

			return ret;
		},

		/**
		 * Converts a keystroke to its string representation.
		 *
		 * ```javascript
		 * var lang = editor.lang.common.keyboard;
		 * var shortcut = CKEDITOR.tools.keystrokeToArray( lang, CKEDITOR.CTRL + 88 );
		 * console.log( shortcut.display ); // [ 'CTRL', 'X' ], on Mac [ '⌘', 'X' ].
		 * console.log( shortcut.aria ); // [ 'CTRL', 'X' ], on Mac [ 'COMMAND', 'X' ].
		 * ```
		 *
		 * @since 4.8.0
		 * @param {Object} lang A language object with the key name translation.
		 * @param {Number} keystroke The keystroke to convert.
		 * @returns {Object}
		 * @returns {String[]} return.display An array of strings that should be used for visible labels.
		 * For Mac devices it uses `⌥` for <kbd>Alt</kbd>, `⇧` for <kbd>Shift</kbd> and `⌘` for <kbd>Command</kbd>.
		 * @returns {String[]} return.aria An array of strings that should be used for ARIA descriptions.
		 * It does not use special characters such as `⌥`, `⇧` or `⌘`.
		 */
		keystrokeToArray: function( lang, keystroke ) {
			var special = keystroke & 0xFF0000,
				key = keystroke & 0x00FFFF,
				isMac = CKEDITOR.env.mac,
				CTRL = 17,
				CMD = 224,
				ALT = 18,
				SHIFT = 16,
				display = [],
				aria = [];


			if ( special & CKEDITOR.CTRL ) {
				display.push( isMac ? '⌘' : lang[ CTRL ] );
				aria.push( isMac ? lang[ CMD ] : lang[ CTRL ] );
			}

			if ( special & CKEDITOR.ALT ) {
				display.push( isMac ? '⌥' : lang[ ALT ] );
				aria.push( lang[ ALT ] );
			}

			if ( special & CKEDITOR.SHIFT ) {
				display.push( isMac ? '⇧' : lang[ SHIFT ] );
				aria.push( lang[ SHIFT ] );
			}

			if ( key ) {
				if ( lang[ key ] ) {
					display.push( lang[ key ] );
					aria.push( lang[ key ] );
				} else {
					display.push( String.fromCharCode( key ) );
					aria.push( String.fromCharCode( key ) );
				}
			}

			return {
				display: display,
				aria: aria
			};
		},

		/**
		 * The data URI of a transparent image. May be used e.g. in HTML as an image source or in CSS in `url()`.
		 *
		 * @since 4.4.0
		 * @readonly
		 */
		transparentImageData: 'data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==',


		/**
		 * Returns the value of the cookie with a given name or `null` if the cookie is not found.
		 *
		 * @since 4.5.6
		 * @param {String} name
		 * @returns {String}
		 */
		getCookie: function( name ) {
			name = name.toLowerCase();
			var parts = document.cookie.split( ';' );
			var pair, key;

			for ( var i = 0; i < parts.length; i++ ) {
				pair = parts[ i ].split( '=' );
				key = decodeURIComponent( CKEDITOR.tools.trim( pair[ 0 ] ).toLowerCase() );

				if ( key === name ) {
					return decodeURIComponent( pair.length > 1 ? pair[ 1 ] : '' );
				}
			}

			return null;
		},

		/**
		 * Sets the value of the cookie with a given name.
		 *
		 * @since 4.5.6
		 * @param {String} name
		 * @param {String} value
		 */
		setCookie: function( name, value ) {
			document.cookie = encodeURIComponent( name ) + '=' + encodeURIComponent( value ) + ';path=/';
		},

		/**
		 * Returns the CSRF token value. The value is a hash stored in `document.cookie`
		 * under the `ckCsrfToken` key. The CSRF token can be used to secure the communication
		 * between the web browser and the server, i.e. for the file upload feature in the editor.
		 *
		 * @since 4.5.6
		 * @returns {String}
		 */
		getCsrfToken: function() {
			var token = CKEDITOR.tools.getCookie( TOKEN_COOKIE_NAME );

			if ( !token || token.length != TOKEN_LENGTH ) {
				token = generateToken( TOKEN_LENGTH );
				CKEDITOR.tools.setCookie( TOKEN_COOKIE_NAME, token );
			}

			return token;
		},

		/**
		 * Returns an escaped CSS selector. `CSS.escape()` is used if defined, leading digit is escaped otherwise.
		 *
		 * @since 4.5.10
		 * @param {String} selector A CSS selector to escape.
		 * @returns {String} An escaped selector.
		 */
		escapeCss: function( selector ) {
			// Invalid input.
			if ( !selector ) {
				return '';
			}

			// CSS.escape() can be used.
			if ( window.CSS && CSS.escape ) {
				return CSS.escape( selector );
			}

			// Simple leading digit escape.
			if ( !isNaN( parseInt( selector.charAt( 0 ), 10 ) ) ) {
				return '\\3' + selector.charAt( 0 ) + ' ' + selector.substring( 1, selector.length );
			}

			return selector;
		},

		/**
		 * Detects which mouse button generated a given DOM event.
		 *
		 * @since 4.7.3
		 * @param {CKEDITOR.dom.event/Event} evt DOM event. Since 4.11.3 a native `MouseEvent` instance can be passed.
		 * @returns {Number|Boolean} Returns a number indicating the mouse button or `false`
		 * if the mouse button cannot be determined.
		 */
		getMouseButton: function( evt ) {
			var domEvent = evt.data ? evt.data.$ : evt;

			if ( !domEvent ) {
				return false;
			}

			if ( CKEDITOR.env.ie && ( CKEDITOR.env.version < 9 || CKEDITOR.env.ie6Compat ) ) {
				if ( domEvent.button === 4 ) {
					return CKEDITOR.MOUSE_BUTTON_MIDDLE;
				} else if ( domEvent.button === 1 ) {
					return CKEDITOR.MOUSE_BUTTON_LEFT;
				} else {
					return CKEDITOR.MOUSE_BUTTON_RIGHT;
				}
			}

			return domEvent.button;
		},

		/**
		 * Convert hex string to array containing 1 byte in each cell. Bytes are represented as Integer numbers.
		 *
		 * @since 4.8.0
		 * @param {String} hexString Contains input string which represent bytes, e.g. `"08A11D8ADA2B"`.
		 * @returns {Number[]} Bytes stored in a form of Integer numbers, e.g. `[ 8, 161, 29, 138, 218, 43 ]`.
		 */
		convertHexStringToBytes: function( hexString ) {
			var bytesArray = [],
				bytesArrayLength = hexString.length / 2,
				i;

			for ( i = 0; i < bytesArrayLength; i++ ) {
				bytesArray.push( parseInt( hexString.substr( i * 2, 2 ), 16 ) );
			}
			return bytesArray;
		},

		/**
		 * Convert bytes array into a base64 encoded string.
		 *
		 * @since 4.8.0
		 * @param {Number[]} bytesArray An array which stores 1 byte in each cell as an Integer number.
		 * @returns {String} Base64 string which represents input bytes.
		 */
		convertBytesToBase64: function( bytesArray ) {
			// Bytes are `8bit` numbers, where base64 use `6bit` to store data. That's why we process 3 Bytes into 4 characters representing base64.
			//
			// Algorithm:
			// 1. Take `3 * 8bit`.
			// 2. If there is less than 3 bytes, fill empty bits with zeros.
			// 3. Transform `3 * 8bit` into `4 * 6bit` numbers.
			// 4. Translate those numbers to proper characters related to base64.
			// 5. If extra zero bytes were added fill them with `=` sign.
			//
			// Example:
			// 1. Bytes Array: [ 8, 161, 29, 138, 218, 43 ] -> binary: `0000 1000 1010 0001 0001 1101 1000 1010 1101 1010 0010 1011`.
			// 2. Binary: `0000 10|00 1010| 0001 00|01 1101| 1000 10|10 1101| 1010 00|10 1011` ← `|` (pipe) shows where base64 will cut bits during transformation.
			// 3. Now we have 6bit numbers (written in decimal values), which are translated to indexes in `base64characters` array.
			//    Decimal: `2 10 4 29 34 45 40 43` → base64: `CKEditor`.
			var base64characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/',
				base64string = '',
				bytesArrayLength = bytesArray.length,
				i;

			for ( i = 0; i < bytesArrayLength; i += 3 ) {
				var array3 = bytesArray.slice( i, i + 3 ),
					array3length = array3.length,
					array4 = [],
					j;

				if ( array3length < 3 ) {
					for ( j = array3length; j < 3; j++ ) {
						array3[ j ] = 0;
					}
				}

				// 0xFC -> 11111100 || 0x03 -> 00000011 || 0x0F -> 00001111 || 0xC0 -> 11000000 || 0x3F -> 00111111
				array4[ 0 ] = ( array3[ 0 ] & 0xFC ) >> 2;
				array4[ 1 ] = ( ( array3[ 0 ] & 0x03 ) << 4 ) | ( array3[ 1 ] >> 4 );
				array4[ 2 ] = ( ( array3[ 1 ] & 0x0F ) << 2 ) | ( ( array3[ 2 ] & 0xC0 ) >> 6 );
				array4[ 3 ] = array3[ 2 ] & 0x3F;

				for ( j = 0; j < 4; j++ ) {
					// Example: if array3length == 1, then we need to add 2 equal signs at the end of base64.
					// array3[ 0 ] is used to calculate array4[ 0 ] and array4[ 1 ], so there will be regular values,
					// next two ones have to be replaced with `=`, because array3[ 1 ] and array3[ 2 ] wasn't present in the input string.
					if ( j <= array3length ) {
						base64string += base64characters.charAt( array4[ j ] );
					} else {
						base64string += '=';
					}
				}

			}
			return base64string;
		},

		/**
		 * A set of functions for operations on styles.
		 *
		 * @property {CKEDITOR.tools.style}
		 */
		style: {
			/**
			 * Methods to parse miscellaneous CSS properties.
			 *
			 * @property {CKEDITOR.tools.style.parse}
			 * @member CKEDITOR.tools.style
			 */
			parse: {
				// Color list based on https://www.w3.org/TR/css-color-4/#named-colors.
				_colors: {
					aliceblue: '#F0F8FF',
					antiquewhite: '#FAEBD7',
					aqua: '#00FFFF',
					aquamarine: '#7FFFD4',
					azure: '#F0FFFF',
					beige: '#F5F5DC',
					bisque: '#FFE4C4',
					black: '#000000',
					blanchedalmond: '#FFEBCD',
					blue: '#0000FF',
					blueviolet: '#8A2BE2',
					brown: '#A52A2A',
					burlywood: '#DEB887',
					cadetblue: '#5F9EA0',
					chartreuse: '#7FFF00',
					chocolate: '#D2691E',
					coral: '#FF7F50',
					cornflowerblue: '#6495ED',
					cornsilk: '#FFF8DC',
					crimson: '#DC143C',
					cyan: '#00FFFF',
					darkblue: '#00008B',
					darkcyan: '#008B8B',
					darkgoldenrod: '#B8860B',
					darkgray: '#A9A9A9',
					darkgreen: '#006400',
					darkgrey: '#A9A9A9',
					darkkhaki: '#BDB76B',
					darkmagenta: '#8B008B',
					darkolivegreen: '#556B2F',
					darkorange: '#FF8C00',
					darkorchid: '#9932CC',
					darkred: '#8B0000',
					darksalmon: '#E9967A',
					darkseagreen: '#8FBC8F',
					darkslateblue: '#483D8B',
					darkslategray: '#2F4F4F',
					darkslategrey: '#2F4F4F',
					darkturquoise: '#00CED1',
					darkviolet: '#9400D3',
					deeppink: '#FF1493',
					deepskyblue: '#00BFFF',
					dimgray: '#696969',
					dimgrey: '#696969',
					dodgerblue: '#1E90FF',
					firebrick: '#B22222',
					floralwhite: '#FFFAF0',
					forestgreen: '#228B22',
					fuchsia: '#FF00FF',
					gainsboro: '#DCDCDC',
					ghostwhite: '#F8F8FF',
					gold: '#FFD700',
					goldenrod: '#DAA520',
					gray: '#808080',
					green: '#008000',
					greenyellow: '#ADFF2F',
					grey: '#808080',
					honeydew: '#F0FFF0',
					hotpink: '#FF69B4',
					indianred: '#CD5C5C',
					indigo: '#4B0082',
					ivory: '#FFFFF0',
					khaki: '#F0E68C',
					lavender: '#E6E6FA',
					lavenderblush: '#FFF0F5',
					lawngreen: '#7CFC00',
					lemonchiffon: '#FFFACD',
					lightblue: '#ADD8E6',
					lightcoral: '#F08080',
					lightcyan: '#E0FFFF',
					lightgoldenrodyellow: '#FAFAD2',
					lightgray: '#D3D3D3',
					lightgreen: '#90EE90',
					lightgrey: '#D3D3D3',
					lightpink: '#FFB6C1',
					lightsalmon: '#FFA07A',
					lightseagreen: '#20B2AA',
					lightskyblue: '#87CEFA',
					lightslategray: '#778899',
					lightslategrey: '#778899',
					lightsteelblue: '#B0C4DE',
					lightyellow: '#FFFFE0',
					lime: '#00FF00',
					limegreen: '#32CD32',
					linen: '#FAF0E6',
					magenta: '#FF00FF',
					maroon: '#800000',
					mediumaquamarine: '#66CDAA',
					mediumblue: '#0000CD',
					mediumorchid: '#BA55D3',
					mediumpurple: '#9370DB',
					mediumseagreen: '#3CB371',
					mediumslateblue: '#7B68EE',
					mediumspringgreen: '#00FA9A',
					mediumturquoise: '#48D1CC',
					mediumvioletred: '#C71585',
					midnightblue: '#191970',
					mintcream: '#F5FFFA',
					mistyrose: '#FFE4E1',
					moccasin: '#FFE4B5',
					navajowhite: '#FFDEAD',
					navy: '#000080',
					oldlace: '#FDF5E6',
					olive: '#808000',
					olivedrab: '#6B8E23',
					orange: '#FFA500',
					orangered: '#FF4500',
					orchid: '#DA70D6',
					palegoldenrod: '#EEE8AA',
					palegreen: '#98FB98',
					paleturquoise: '#AFEEEE',
					palevioletred: '#DB7093',
					papayawhip: '#FFEFD5',
					peachpuff: '#FFDAB9',
					peru: '#CD853F',
					pink: '#FFC0CB',
					plum: '#DDA0DD',
					powderblue: '#B0E0E6',
					purple: '#800080',
					rebeccapurple: '#663399',
					red: '#FF0000',
					rosybrown: '#BC8F8F',
					royalblue: '#4169E1',
					saddlebrown: '#8B4513',
					salmon: '#FA8072',
					sandybrown: '#F4A460',
					seagreen: '#2E8B57',
					seashell: '#FFF5EE',
					sienna: '#A0522D',
					silver: '#C0C0C0',
					skyblue: '#87CEEB',
					slateblue: '#6A5ACD',
					slategray: '#708090',
					slategrey: '#708090',
					snow: '#FFFAFA',
					springgreen: '#00FF7F',
					steelblue: '#4682B4',
					tan: '#D2B48C',
					teal: '#008080',
					thistle: '#D8BFD8',
					tomato: '#FF6347',
					turquoise: '#40E0D0',
					violet: '#EE82EE',
					windowtext: 'windowtext',
					wheat: '#F5DEB3',
					white: '#FFFFFF',
					whitesmoke: '#F5F5F5',
					yellow: '#FFFF00',
					yellowgreen: '#9ACD32'
				},

				_borderStyle: [
					'none',
					'hidden',
					'dotted',
					'dashed',
					'solid',
					'double',
					'groove',
					'ridge',
					'inset',
					'outset'
				],

				_widthRegExp: /^(thin|medium|thick|[\+-]?\d+(\.\d+)?[a-z%]+|[\+-]?0+(\.0+)?|\.\d+[a-z%]+)$/,

				_rgbaRegExp: /rgba?\(\s*\d+%?\s*,\s*\d+%?\s*,\s*\d+%?\s*(?:,\s*[0-9.]+\s*)?\)/gi,

				_hslaRegExp: /hsla?\(\s*[0-9.]+\s*,\s*\d+%\s*,\s*\d+%\s*(?:,\s*[0-9.]+\s*)?\)/gi,

				/**
				 * Parses the `value` used as a `background` property shorthand and returns information as an object.
				 *
				 * **Note:** Currently only the `color` property is extracted. Any other parts will go into the `unprocessed` property.
				 *
				 *		var background = CKEDITOR.tools.style.parse.background( '#0C0 url(foo.png)' );
				 *		console.log( background );
				 *		// Logs: { color: '#0C0', unprocessed: 'url(foo.png)' }
				 *
				 * @param {String} value The value of the `background` property.
				 * @returns {Object} An object with information extracted from the background.
				 * @returns {String} return.color The **first** color value found. The color format remains the same as in input.
				 * @returns {String} return.unprocessed The remaining part of the `value` that has not been processed.
				 * @member CKEDITOR.tools.style.parse
				 */
				background: function( value ) {
					var ret = {},
						colors = this._findColor( value );

					if ( colors.length ) {
						ret.color = colors[ 0 ];

						CKEDITOR.tools.array.forEach( colors, function( colorToken ) {
							value = value.replace( colorToken, '' );
						} );
					}

					value = CKEDITOR.tools.trim( value );

					if ( value ) {
						// If anything was left unprocessed include it as unprocessed part.
						ret.unprocessed = value;
					}

					return ret;
				},

				/**
				 * Parses the `margin` CSS property shorthand format.
				 *
				 * ```javascript
				 *	console.log( CKEDITOR.tools.parse.margin( '3px 0 2' ) );
				 *	// Logs: { top: "3px", right: "0", bottom: "2", left: "0" }
				 * ```
				 *
				 * @param {String} value The `margin` property value.
				 * @returns {Object.<String, String>}
				 * @returns {String} return.top Top margin.
				 * @returns {String} return.right Right margin.
				 * @returns {String} return.bottom Bottom margin.
				 * @returns {String} return.left Left margin.
				 * @member CKEDITOR.tools.style.parse
				 */
				margin: function( value ) {
					return CKEDITOR.tools.style.parse.sideShorthand( value, function( width ) {
						return width.match( /(?:\-?[\.\d]+(?:%|\w*)|auto|inherit|initial|unset|revert)/g ) || [ '0px' ];
					} );
				},

				/**
				 * Parses the CSS property shorthand format of all `top`, `right`, `bottom`, `left` sides.
				 *
				 * ```javascript
				 *	console.log( CKEDITOR.tools.style.parse.sideShorthand( 'solid dotted' ) );
				 *	// Logs: { top: 'solid', right: 'dotted', bottom: 'solid', left: 'dotted' }
				 *
				 * console.log( CKEDITOR.tools.style.parse.sideShorthand( 'foo baz', split ) );
				 * // Logs: { top: 'foo', right: 'baz', bottom: 'foo', left: 'baz' }
				 *
				 * console.log( CKEDITOR.tools.style.parse.sideShorthand( 'something else', split ) );
				 * // Logs: { top: 'bar', right: 'quix', bottom: 'bar', left: 'quix' }
				 *
				 * function split( value ) {
				 *  	return value.match( /(foo|baz)/g ) || [ 'bar', 'quix' ];
				 * }
				 * ```
				 *
				 * @since 4.12.0
				 * @param {String} value The shorthand property value.
				 * @param {Function} [split] The function used to split the CSS property shorthand.
				 * It should return an array of side shorthand parts (see the `split` function in the code listing).
				 * If not set, the property value will be split by spaces.
				 * @returns {Object.<String, String>}
				 * @returns {String} return.top Top value.
				 * @returns {String} return.right Right value.
				 * @returns {String} return.bottom Bottom value.
				 * @returns {String} return.left Left value.
				 * @member CKEDITOR.tools.style.parse
				 */
				sideShorthand: function( value, split ) {
					var ret = {},
						parts = split ? split( value ) : value.split( /\s+/ );

					switch ( parts.length ) {
						case 1:
							mapStyles( [ 0, 0, 0, 0 ] );
							break;
						case 2:
							mapStyles( [ 0, 1, 0, 1 ] );
							break;
						case 3:
							mapStyles( [ 0, 1, 2, 1 ] );
							break;
						case 4:
							mapStyles( [ 0, 1, 2, 3 ] );
							break;
					}

					function mapStyles( map ) {
						ret.top = parts[ map[ 0 ] ];
						ret.right = parts[ map[ 1 ] ];
						ret.bottom = parts[ map[ 2 ] ];
						ret.left = parts[ map[ 3 ] ];
					}

					return ret;
				},

				/**
				 * @param {String} value The `border` property value.
				 * @returns {CKEDITOR.tools.style.border} Border style.
				 * @deprecated 4.12.0 Use {@link CKEDITOR.tools.style.border#fromCssRule} instead.
				 * @member CKEDITOR.tools.style.parse
				 */
				border: function( value ) {
					return CKEDITOR.tools.style.border.fromCssRule( value );
				},

				/**
				 * Searches the `value` for any CSS color occurrences and returns it.
				 *
				 * @private
				 * @param {String} value
				 * @returns {String[]} An array of matched results.
				 * @member CKEDITOR.tools.style.parse
				 */
				_findColor: function( value ) {
					var ret = [],
						arrayTools = CKEDITOR.tools.array;


					// Check for rgb(a).
					ret = ret.concat( value.match( this._rgbaRegExp ) || [] );

					// Check for hsl(a).
					ret = ret.concat( value.match( this._hslaRegExp ) || [] );

					ret = ret.concat( arrayTools.filter( value.split( /\s+/ ), function( colorEntry ) {
						// Check for hex format.
						if ( colorEntry.match( /^\#[a-f0-9]{3}(?:[a-f0-9]{3})?$/gi ) ) {
							return true;
						}

						// Check for preset names.
						return colorEntry.toLowerCase() in CKEDITOR.tools.style.parse._colors;
					} ) );

					return ret;
				}
			}
		},

		/**
		 * A set of array helpers.
		 *
		 * @property {CKEDITOR.tools.array}
		 * @member CKEDITOR.tools
		 */
		array: {
			/**
			 * Returns a copy of `array` filtered using the `fn` function. Any elements that the `fn` will return `false` for
			 * will get removed from the returned array.
			 *
			 *		var filtered = this.array.filter( [ 0, 1, 2, 3 ], function( value ) {
			 *			// Leave only values equal or greater than 2.
			 *			return value >= 2;
			 *		} );
			 *		console.log( filtered );
			 *		// Logs: [ 2, 3 ]
			 *
			 * @param {Array} array
			 * @param {Function} fn A function that gets called with each `array` item. Any item that `fn`
			 * returned a `false`-alike value for will be filtered out of the `array`.
			 * @param {Mixed} fn.value The currently iterated array value.
			 * @param {Number} fn.index The index of the currently iterated value in an array.
			 * @param {Array} fn.array The original array passed as the `array` variable.
			 * @param {Mixed} [thisArg=undefined] A context object for `fn`.
			 * @returns {Array} The filtered array.
			 * @member CKEDITOR.tools.array
			 */
			filter: function( array, fn, thisArg ) {
				var ret = [];

				this.forEach( array, function( val, i ) {
					if ( fn.call( thisArg, val, i, array ) ) {
						ret.push( val );
					}
				} );

				return ret;
			},

			/**
			 * Returns the first element in the array for which the given callback `fn` returns `true`.
			 *
			 * ```js
			 * var array = [ 1, 2, 3, 4 ];
			 *
			 * CKEDITOR.tools.array.find( array, function( item ) {
			 *     return item > 2;
			 * } ); // returns 3.
			 * ```
			 *
			 * @param {Array} array An array to be iterated over.
			 * @param {Function} fn A function called for every `array` element until it returns `true`.
			 * @param {Mixed} fn.value The currently iterated array value.
			 * @param {Number} fn.index The index of the currently iterated value in an array.
			 * @param {Array} fn.array The original array passed as an `array` variable.
			 * @param {Mixed} [thisArg=undefined] The context object for `fn`.
			 * @returns {*} The first matched value or `undefined` otherwise.
			 * @member CKEDITOR.tools.array
			 * @since 4.12.0
			 */
			find: function( array, fn, thisArg ) {
				var length = array.length,
					i = 0;

				while ( i < length ) {
					if ( fn.call( thisArg, array[ i ], i, array ) ) {
						return array[ i ];
					}
					i++;
				}

				return undefined;
			},

			/**
			 * Iterates over every element in the `array`.
			 *
			 * @param {Array} array An array to be iterated over.
			 * @param {Function} fn The function called for every `array` element.
			 * @param {Mixed} fn.value The currently iterated array value.
			 * @param {Number} fn.index The index of the currently iterated value in an array.
			 * @param {Array} fn.array The original array passed as an `array` variable.
			 * @param {Mixed} [thisArg=undefined] The context object for `fn`.
			 * @member CKEDITOR.tools.array
			 */
			forEach: function( array, fn, thisArg ) {
				var len = array.length,
					i;

				for ( i = 0; i < len; i++ ) {
					fn.call( thisArg, array[ i ], i, array );
				}
			},

			/**
			 * Applies a function to each element of an array and returns the array of results in the same order.
			 * Note the order of the parameters.
			 *
			 * @param {Array} array An array of elements that `fn` is applied on.
			 * @param {Function} fn A function with the signature `a -> b`.
			 * @param {Mixed} [thisArg=undefined] The context object for `fn`.
			 * @returns {Array} An array of mapped elements.
			 * @member CKEDITOR.tools.array
			 * @since 4.6.2
			 */
			map: function( array, fn, thisArg ) {
				var result = [];
				for ( var i = 0; i < array.length; i++ ) {
					result.push( fn.call( thisArg, array[ i ], i, array ) );
				}
				return result;
			},

			/**
			 * Applies a function against each value in an array storing the result in an accumulator passed to the next iteration.
			 * Note the order of the parameters.
			 *
			 * @param {Array} array An array of elements that `fn` is applied on.
			 * @param {Function} fn A function with the signature `(accumulator, a, index, array) -> b`.
			 * @param {Mixed} initial Initial value of the accumulator.
			 * @param {Mixed} [thisArg=undefined] The context object for `fn`.
			 * @returns {Mixed} The final value of the accumulator.
			 * @member CKEDITOR.tools.array
			 * @since 4.6.2
			*/
			reduce: function( array, fn, initial, thisArg ) {
				var acc = initial;
				for ( var i = 0; i < array.length; i++ ) {
					acc = fn.call( thisArg, acc, array[ i ], i, array );
				}
				return acc;
			},

			/**
			 * Tests whether all elements in an array pass the test implemented by the provided function.
			 * Returns `true` if the provided array is empty.
			 *
			 *		var every = this.array.every( [ 11, 22, 33, 44 ], function( value ) {
			 *			return value > 10;
			 *		} );
			 *		console.log( every );
			 *		// Logs: true
			 *
			 * @param {Array} array
			 * @param {Function} fn A function that gets called with each `array` item.
			 * @param {Mixed} fn.value The currently iterated array value.
			 * @param {Number} fn.index The index of the currently iterated value in an array.
			 * @param {Array} fn.array The original array passed as the `array` variable.
			 * @param {Mixed} [thisArg=undefined] A context object for `fn`.
			 * @returns {Boolean} Information whether all elements pass the test.
			 * @member CKEDITOR.tools.array
			 * @since 4.8.0
			 */
			every: function( array, fn, thisArg ) {
				// Empty arrays always return true.
				if ( !array.length ) {
					return true;
				}

				var ret = this.filter( array, fn, thisArg );

				return array.length === ret.length;
			}
		},

		/**
		 * A set of object helpers.
		 *
		 * @property {CKEDITOR.tools.object}
		 * @member CKEDITOR.tools
		 */
		object: {

			/**
			 * List of ECMA3 object properties with obsolete
			 * [DontEnum](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Properties)
			 * attribute.
			 *
			 * @member CKEDITOR.tools.object
			 * @private
			 * @since 4.12.0
			 */
			DONT_ENUMS: [
				'toString',
				'toLocaleString',
				'valueOf',
				'hasOwnProperty',
				'isPrototypeOf',
				'propertyIsEnumerable',
				'constructor'
			],

			/**
			 * Returns an array of key-value pairs using enumerable string-keyed
			 * object properties.
			 *
			 * ```javascript
			 *	console.log( CKEDITOR.tools.object.entries( { foo: 1, bar: false } );
			 *	// -> [ [ 'foo', 1 ], [ 'bar', false ] ]
			 * ```
			 *
			 * @since 4.12.0
			 * @member CKEDITOR.tools.object
			 * @param {Object} obj
			 * @returns {Array} Object's key-value pairs.
			 */
			entries: function( obj ) {
				return CKEDITOR.tools.array.map( CKEDITOR.tools.object.keys( obj ), function( key ) {
					return [ key, obj[ key ] ];
				} );
			},

			/**
			 * Returns an array of passed object enumerable values.
			 *
			 * ```javascript
			 *	console.log( CKEDITOR.tools.object.values( { foo: 1, bar: false } );
			 *	// -> [ 1, false ]
			 * ```
			 *
			 * @since 4.12.0
			 * @member CKEDITOR.tools.object
			 * @param {Object} obj
			 * @returns {Array} Object's values.
			 */
			values: function( obj ) {
				return CKEDITOR.tools.array.map( CKEDITOR.tools.object.keys( obj ), function( key ) {
					return obj[ key ];
				} );
			},

			/**
			 * Returns an array of passed object keys.
			 *
			 * ```javascript
			 *	console.log( CKEDITOR.tools.object.keys( { foo: 1, bar: false } );
			 *	// -> [ 'foo', 'bar' ]
			 * ```
			 *
			 * @since 4.12.0
			 * @member CKEDITOR.tools.object
			 * @param {Object} obj
			 * @returns {Array} Object's keys.
			 */
			keys: function( obj ) {
				var hasOwnProperty = Object.prototype.hasOwnProperty,
					keys = [],
					dontEnums = CKEDITOR.tools.object.DONT_ENUMS;

				for ( var prop in obj ) {
					keys.push( prop );
				}

				// Fix don't enum bug for IE < 9 browsers (#3120).
				if ( CKEDITOR.env.ie && CKEDITOR.env.version < 9 ) {
					for ( var i = 0; i < dontEnums.length; i++ ) {
						if ( hasOwnProperty.call( obj, dontEnums[ i ] ) ) {
							keys.push( dontEnums[ i ] );
						}
					}
				}

				return keys;
			},

			/**
			 * Returns the first key from `obj` which has a given `value`.
			 *
			 * @param {Object} obj An object whose `key` is looked for.
			 * @param {Mixed} value An object's `value` to be looked for.
			 * @returns {String/null} Matched `key` or `null` if not found.
			 * @member CKEDITOR.tools.object
			 */

			findKey: function( obj, value ) {
				if ( typeof obj !== 'object' ) {
					return null;
				}

				var key;

				for ( key in obj ) {
					if ( obj[ key ] === value ) {
						return key;
					}
				}

				return null;
			},

			/**
			 * Merges two objects and returns the new one.
			 *
			 *		var obj1 = {
			 *				a: 1,
			 *				conflicted: 10,
			 *				obj: {
			 *					c: 1
			 *				}
			 *			},
			 *			obj2 = {
			 *				b: 2,
			 *				conflicted: 20,
			 *				obj: {
			 *					d: 2
			 *				}
			 *			};
			 *
			 *		CKEDITOR.tools.object.merge( obj1, obj2 );
			 *
			 * This code produces the following object:
			 *
			 *		{
			 *			a: 1,
			 *			b: 2,
			 *			conflicted: 20,
			 *			obj: {
			 *				c: 1,
			 *				d: 2
			 *			}
			 *		}
			 *
			 * @param {Object} obj1 The source object which will be used to create a new base object.
			 * @param {Object} obj2 An object whose properties will be merged into the base one.
			 * @returns {Object} The merged object.
			 * @member CKEDITOR.tools.object
			 */
			merge: function( obj1, obj2 ) {
				var tools = CKEDITOR.tools,
					copy1 = tools.clone( obj1 ),
					copy2 = tools.clone( obj2 );

				tools.array.forEach( tools.object.keys( copy2 ), function( key ) {
					if ( typeof copy2[ key ] === 'object' && typeof copy1[ key ] === 'object' ) {
						copy1[ key ] = tools.object.merge( copy1[ key ], copy2[ key ] );
					} else {
						copy1[ key ] = copy2[ key ];
					}
				} );

				return copy1;
			}
		},

		/**
		 * Converts relative positions inside a DOM rectangle into absolute ones using the given window as context.
		 * "Absolute" here means in relation to the upper-left corner of the topmost viewport.
		 *
		 * @since 4.10.0
		 * @param { CKEDITOR.dom.window } window The window containing an element for which the rectangle is passed.
		 * @param { CKEDITOR.dom.rect } rect A rectangle with a relative position.
		 * @returns { CKEDITOR.dom.rect } A rectangle with an absolute position.
		 */
		getAbsoluteRectPosition: function( window, rect ) {
			var newRect = CKEDITOR.tools.copy( rect );
			appendParentFramePosition( window.getFrame() );

			var winGlobalScroll = CKEDITOR.document.getWindow().getScrollPosition();

			newRect.top += winGlobalScroll.y;
			newRect.left += winGlobalScroll.x;

			// If there is no x or y, e.g. Microsoft browsers, don't return them, otherwise we will have rect.x = NaN.
			if ( ( 'x' in newRect ) && ( 'y' in newRect ) ) {
				newRect.y += winGlobalScroll.y;
				newRect.x += winGlobalScroll.x;
			}

			newRect.right = newRect.left + newRect.width;
			newRect.bottom = newRect.top + newRect.height;

			return newRect;

			function appendParentFramePosition( frame ) {
				if ( !frame ) {
					return;
				}

				var frameRect = frame.getClientRect();

				newRect.top += frameRect.top;
				newRect.left += frameRect.left;

				if ( ( 'x' in newRect ) && ( 'y' in newRect ) ) {
					newRect.x += frameRect.x;
					newRect.y += frameRect.y;
				}

				appendParentFramePosition( frame.getWindow().getFrame() );
			}
		}
	};

	// Generates a CSRF token with a given length.
	//
	// @since 4.5.6
	// @param {Number} length
	// @returns {string}
	function generateToken( length ) {
		var randValues = [];
		var result = '';

		if ( window.crypto && window.crypto.getRandomValues ) {
			randValues = new Uint8Array( length );
			window.crypto.getRandomValues( randValues );
		} else {
			for ( var i = 0; i < length; i++ ) {
				randValues.push( Math.floor( Math.random() * 256 ) );
			}
		}

		for ( var j = 0; j < randValues.length; j++ ) {
			var character = tokenCharset.charAt( randValues[ j ] % tokenCharset.length );
			result += Math.random() > 0.5 ? character.toUpperCase() : character;
		}

		return result;
	}

	/**
	 * Buffers `input` events (or any `input` calls) and triggers `output` not more often than once per `minInterval`.
	 *
	 * @since 4.11.0
	 * @class CKEDITOR.tools.buffers.event
	 * @member CKEDITOR.tools.buffers
	 * @constructor Creates a new instance of the buffer.
	 * @param {Number} minInterval The minimum interval between `output` calls in milliseconds.
	 * @param {Function} output The function that will be executed as `output`.
	 * @param {Object} [contextObj] The object used as context to the listener call (the `this` object).
	 */
	function EventsBuffer( minInterval, output, context ) {
		/**
		 * The minimal interval (in milliseconds) between the calls.
		 *
		 * @private
		 * @readonly
		 * @property {Number}
		 */
		this._minInterval = minInterval;

		/**
		 * The variable to be used as a context for the output calls.
		 *
		 * @private
		 * @readonly
		 * @property {Mixed}
		 */
		this._context = context;

		/**
		 * The ID of a delayed function call that will be called after the current interval frame.
		 *
		 * @private
		 */
		this._scheduledTimer = 0;

		this._lastOutput = 0;

		this._output = CKEDITOR.tools.bind( output, context || {} );

		var that = this;

		/**
		 * Acts as a proxy to the `output` function given in the consturctor, providing function throttling.
		 *
		 * Guarantees that the `output` function does not get called more often than
		 * indicated by the {@link #_minInterval}.
		 *
		 * The first `input` call is always executed asynchronously which means that the `output`
		 * call will be executed immediately.
		 *
		 * ```javascript
		 *	var buffer = new CKEDITOR.tools.buffers.event( 200, function() {
		 *		console.log( 'foo!' );
		 *	} );
		 *
		 *	buffer.input();
		 *	// 'foo!' logged immediately.
		 *	buffer.input();
		 *	// Nothing logged.
		 *	buffer.input();
		 *	// Nothing logged.
		 *	// … after 200ms a single 'foo!' will be logged.
		 * ```
		 *
		 * Can be easily used with events:
		 *
		 * ```javascript
		 *	var buffer = new CKEDITOR.tools.buffers.event( 200, function() {
		 *		console.log( 'foo!' );
		 *	} );
		 *
		 *	editor.on( 'key', buffer.input );
		 *	// Note: There is no need to bind the buffer as a context.
		 * ```
		 *
		 * @method
		 * @param {Mixed[]} [args]
		 */
		this.input = function() {
			// NOTE: This function needs to be created for each instance,
			// as there's a common practice to pass `buffer.input`
			// directly to a listener, and overwrite context object.
			if ( that._scheduledTimer && that._reschedule() === false ) {
				return;
			}

			var diff = ( new Date() ).getTime() - that._lastOutput;

			// If less than minInterval passed after last check,
			// schedule next for minInterval after previous one.
			if ( diff < that._minInterval ) {
				that._scheduledTimer = setTimeout( triggerOutput, that._minInterval - diff );
			} else {
				triggerOutput();
			}

			function triggerOutput() {
				that._lastOutput = ( new Date() ).getTime();
				that._scheduledTimer = 0;

				that._call();
			}
		};
	}

	EventsBuffer.prototype = {
		/**
		 * Resets the buffer state and cancels any pending calls.
		 */
		reset: function() {
			this._lastOutput = 0;
			this._clearTimer();
		},
		/**
		 * Called when the function call should be rescheduled.
		 *
		 * @private
		 * @returns {Boolean/undefined} If it returns `false`, the the parent call will be stopped.
		 */
		_reschedule: function() {
			return false;
		},
		/**
		 * Performs an actual call.
		 *
		 * @private
		 */
		_call: function() {
			this._output();
		},
		/**
		 * Cancels the deferred timeout.
		 *
		 * @private
		 */
		_clearTimer: function() {
			if ( this._scheduledTimer ) {
				clearTimeout( this._scheduledTimer );
			}

			this._scheduledTimer = 0;
		}
	};

	/**
	 * Throttles `input` events (or any `input` calls) and triggers `output` not more often than once per `minInterval`.
	 *
	 * Unlike {@link CKEDITOR.tools.buffers.event} this class allows passing custom parameters into the {@link #input}
	 * function. For more information see the
	 * [Throttling function issue](https://github.com/ckeditor/ckeditor-dev/issues/1993).
	 *
	 * @since 4.11.0
	 * @class CKEDITOR.tools.buffers.throttle
	 * @extends CKEDITOR.tools.buffers.event
	 */
	function ThrottleBuffer( minInterval, output, context ) {
		EventsBuffer.call( this, minInterval, output, context );

		/**
		 * Arguments for the last scheduled call.
		 *
		 * @property {Mixed[]}
		 * @private
		 */
		this._args = [];

		var that = this;

		/**
		 * Acts as a proxy to the `output` function given in the constructor, providing function throttling.
		 *
		 * Guarantees that the `output` function does not get called more often than
		 * indicated by the {@link #_minInterval}.
		 *
		 * If multiple calls occur within a single `minInterval` time,
		 * the most recent `input` call with its arguments will be used to schedule
		 * the next `output` call, and the previous throttled calls will be discarded.
		 *
		 * The first `input` call is always executed asynchronously which means that the `output`
		 * call will be executed immediately.
		 *
		 * ```javascript
		 *	var buffer = new CKEDITOR.tools.buffers.throttle( 200, function( message ) {
		 *		console.log( message );
		 *	} );
		 *
		 *	buffer.input( 'foo!' );
		 *	// 'foo!' logged immediately.
		 *	buffer.input( 'bar!' );
		 *	// Nothing logged.
		 *	buffer.input( 'baz!' );
		 *	// Nothing logged.
		 *	// … after 200ms a single 'baz!' will be logged.
		 * ```
		 *
		 * It can be easily used with events:
		 *
		 * ```javascript
		 *	var buffer = new CKEDITOR.tools.buffers.throttle( 200, function( evt ) {
		 *		console.log( evt.data.text );
		 *	} );
		 *
		 *	editor.on( 'key', buffer.input );
		 *	// Note: There is no need to bind the buffer as a context.
		 * ```
		 * @method
		 * @param {Mixed[]} [args]
		 */
		this.input = CKEDITOR.tools.override( this.input, function( originalInput ) {
			return function() {
				that._args = Array.prototype.slice.call( arguments );

				originalInput.call( this );
			};
		} );
	}

	ThrottleBuffer.prototype = CKEDITOR.tools.prototypedCopy( EventsBuffer.prototype );

	ThrottleBuffer.prototype._reschedule = function() {
		if ( this._scheduledTimer ) {
			this._clearTimer();
		}
	};

	ThrottleBuffer.prototype._call = function() {
		this._output.apply( this._context, this._args );
	};

	CKEDITOR.tools.buffers = {};
	CKEDITOR.tools.buffers.event = EventsBuffer;
	CKEDITOR.tools.buffers.throttle = ThrottleBuffer;

	/**
	 * Represents the CSS border style.
	 *
	 * @since 4.12.0
	 * @class CKEDITOR.tools.style.border
	 */
	CKEDITOR.tools.style.border = CKEDITOR.tools.createClass( {

		/**
		 * Creates a new instance of the border style.
		 * @constructor
		 * @param {Object} [props] Style-related properties.
		 * @param {String} [props.color] Border color.
		 * @param {String} [props.style] Border style.
		 * @param {String} [props.width] Border width.
		 */
		$: function( props ) {
			props = props || {};

			/**
			 * Represents the value of the CSS `width` property.
			 *
			 * @property {String} [width]
			 */
			this.width = props.width;

			/**
			 * Represents the value of the CSS `style` property.
			 *
			 * @property {String} [style]
			 */
			this.style = props.style;

			/**
			 * Represents the value of the CSS `color` property.
			 *
			 * @property {String} [color]
			 */
			this.color = props.color;

			this._.normalize();
		},

		_: {
			normalizeMap: {
				color: [
					[ /windowtext/g, 'black' ]
				]
			},

			normalize: function() {
				for ( var propName in this._.normalizeMap ) {
					var val = this[ propName ];

					if ( val ) {
						this[propName] = CKEDITOR.tools.array.reduce( this._.normalizeMap[ propName ], function( cur, rule ) {
							return cur.replace( rule[ 0 ], rule[ 1 ] );
						}, val );
					}
				}
			}
		},

		proto: {
			toString: function() {
				return CKEDITOR.tools.array.filter( [ this.width, this.style, this.color ], function( item ) {
					return !!item;
				} ).join( ' ' );
			}
		},

		statics: {
			/**
			 * Parses the CSS `border` property shorthand format.
			 * This CSS property [does not support inheritance](https://www.w3.org/TR/css3-background/#the-border-shorthands).
			 *
			 * ```javascript
			 *	console.log( CKEDITOR.tools.style.border.fromCssRule( '3px solid #ffeedd' ) );
			 *	// Logs: Border { width: '3px', style: 'solid', color: '#ffeedd' }
			 * ```
			 *
			 * @static
			 * @param {String} value The `border` property value.
			 * @returns {CKEDITOR.tools.style.border} Border style.
			 * @member CKEDITOR.tools.style.border
			 */
			fromCssRule: function( value ) {
				var props = {},
					input = value.split( /\s+/g ),
					parseColor = CKEDITOR.tools.style.parse._findColor( value );

				if ( parseColor.length ) {
					props.color = parseColor[ 0 ];
				}

				CKEDITOR.tools.array.forEach( input, function( val ) {
					if ( !props.style ) {
						if ( CKEDITOR.tools.indexOf( CKEDITOR.tools.style.parse._borderStyle, val ) !== -1 ) {
							props.style = val;
							return;
						}
					}

					if ( !props.width ) {
						if ( CKEDITOR.tools.style.parse._widthRegExp.test( val ) ) {
							props.width = val;
							return;
						}
					}

				} );

				return new CKEDITOR.tools.style.border( props );
			},

			/**
			 * Parses the `style`, `width` and `color` shorthand styles into
			 * border side shorthand styles.
			 *
			 * ```javascript
			 * var styles = {
			 *		'border-color': 'red blue',
			 *		'border-style': 'solid dotted solid',
			 *		'border-width': '1px 2px 3px 4px'
			 * };
			 *
			 * console.log( CKEDITOR.tools.style.border.splitCssValues( styles ) );
			 * // Logs:
			 * // {
			 * // 	'border-top': Border { width: '1px', style: 'solid', color: 'red' },
			 * // 	'border-right': Border { width: '2px', style: 'dotted', color: 'blue'},
			 * // 	'border-bottom': Border { width: '3px', style: 'solid', color: 'red' },
			 * // 	'border-left': Border { width: '4px', style: 'dotted', color: 'blue' }
			 * // }
			 *
			 * // Use fallback to fill up missing style:
			 * var partialStyles = {
			 * 		'border-style': 'solid',
			 * 		'border-width': '2px'
			 * 	},
			 * 	fallback = { color: 'red' };
			 *
			 * console.log( CKEDITOR.tools.style.border.splitCssValues( partialStyles, fallback ) );
			 * // Logs:
			 * // {
			 * // 	'border-top': Border { width: '2px', style: 'solid', color: 'red' },
			 * // 	'border-right': Border { width: '2px', style: 'solid', color: 'red' },
			 * // 	'border-bottom': Border { width: '2px', style: 'solid', color: 'red' },
			 * // 	'border-left': Border { width: '2px', style: 'solid', color: 'red' }
			 * // }
			 * ```
			 *
			 * Border side shorthands with greater style property specificity are preferred
			 * over more general shorthands.
			 *
			 * ```
			 * var styles = {
			 * 		'border-style': 'solid',
			 * 		'border-width': '2px',
			 * 		'border-color': 'red',
			 * 		'border-left-color': 'blue',
			 * 		'border-right-width': '10px',
			 * 		'border-top-style': 'dotted',
			 * 		'border-top-color': 'green'
			 * };
			 *
			 * console.log( CKEDITOR.tools.style.border.splitCssValues( styles ) );
			 * // Logs:
			 * // {
			 * // 	'border-top': Border { width: '2px', style: 'dotted', color: 'green' },
			 * // 	'border-right': Border { width: '10px', style: 'solid', color: 'red'},
			 * // 	'border-bottom': Border { width: '2px', style: 'solid', color: 'red' },
			 * // 	'border-left': Border { width: '2px', style: 'solid', color: 'blue' }
			 * // }
			 * ```
			 *
			 * @static
			 * @param {Object} styles Border styles shorthand object.
			 * @param {Object} [styles.border-color] Border color shorthand.
			 * @param {Object} [styles.border-style] Border style shorthand.
			 * @param {Object} [styles.border-width] Border width shorthand.
			 * @param {Object} [fallback] Fallback object used to fill up missing style.
			 * @param {Object} [fallback.color] Color CSS style used in absence of the `border-color` style.
			 * @param {Object} [fallback.style] Style CSS style used in absence of the `border-style` style.
			 * @param {Object} [fallback.width] Width CSS style used in absence of the `border-width` style.
			 * @returns {Object.<String, CKEDITOR.tools.style.border>}
			 * @returns {CKEDITOR.tools.style.border} return.border-top Border top style.
			 * @returns {CKEDITOR.tools.style.border} return.border-right Border right style.
			 * @returns {CKEDITOR.tools.style.border} return.border-bottom Border bottom style.
			 * @returns {CKEDITOR.tools.style.border} return.border-left Border left style.
			 * @member CKEDITOR.tools.style.border
			 */
			splitCssValues: function( styles, fallback ) {
				var types = [ 'width', 'style', 'color' ],
					sides = [ 'top', 'right', 'bottom', 'left' ];

				fallback = fallback || {};

				var stylesMap = CKEDITOR.tools.array.reduce( types, function( cur, type ) {
					var style = styles[ 'border-' + type ] || fallback[ type ];

					cur[ type ] = style ? CKEDITOR.tools.style.parse.sideShorthand( style ) : null;

					return cur;
				}, {} );

				return CKEDITOR.tools.array.reduce( sides, function( cur, side ) {
					var map = {};

					for ( var style in stylesMap ) {
						// Prefer property with greater specificity e.g
						// `border-top-color` over `border-color`.
						var sideProperty = styles[ 'border-' + side + '-' + style ];
						if ( sideProperty ) {
							map[ style ] = sideProperty;
						} else {
							map[ style ] = stylesMap[ style ] && stylesMap[ style ][ side ];
						}
					}

					cur[ 'border-' + side ] = new CKEDITOR.tools.style.border( map );

					return cur;
				}, {} );
			}
		}
	} );

	/**
	 * @member CKEDITOR.tools.array
	 * @method indexOf
	 * @inheritdoc CKEDITOR.tools#indexOf
	 */
	CKEDITOR.tools.array.indexOf = CKEDITOR.tools.indexOf;

	/**
	 * @member CKEDITOR.tools.array
	 * @method isArray
	 * @inheritdoc CKEDITOR.tools#isArray
	 */
	CKEDITOR.tools.array.isArray = CKEDITOR.tools.isArray;

	/**
	 * Left mouse button.
	 *
	 * @since 4.7.3
	 * @readonly
	 * @property {Number} [=0]
	 * @member CKEDITOR
	 */
	CKEDITOR.MOUSE_BUTTON_LEFT = 0;

	/**
	 * Middle mouse button.
	 *
	 * @since 4.7.3
	 * @readonly
	 * @property {Number} [=1]
	 * @member CKEDITOR
	 */
	CKEDITOR.MOUSE_BUTTON_MIDDLE = 1;

	/**
	 * Right mouse button.
	 *
	 * @since 4.7.3
	 * @readonly
	 * @property {Number} [=2]
	 * @member CKEDITOR
	 */
	CKEDITOR.MOUSE_BUTTON_RIGHT = 2;

	/**
	 * The namespace containing functions to work on CSS properties.
	 *
	 * @since 4.6.1
	 * @class CKEDITOR.tools.style
	 */

	/**
	 * The namespace with helper functions to parse some common CSS properties.
	 *
	 * @since 4.6.1
	 * @class CKEDITOR.tools.style.parse
	 */

	/**
	 * The namespace with helper functions and polyfills for arrays.
	 *
	 * @since 4.6.1
	 * @class CKEDITOR.tools.array
	 */

	/**
	 * The namespace with helper functions and polyfills for objects.
	 *
	 * @since 4.7.1
	 * @class CKEDITOR.tools.object
	 */
} )();

// PACKAGER_RENAME( CKEDITOR.tools )

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Defines the {@link CKEDITOR.dtd} object, which holds the DTD
 *		mapping for XHTML 1.0 Transitional. This file was automatically
 *		generated from the file: xhtml1-transitional.dtd.
 */

/**
 * Holds and object representation of the HTML DTD to be used by the
 * editor in its internal operations.
 *
 * Each element in the DTD is represented by a property in this object. Each
 * property contains the list of elements that can be contained by the element.
 * Text is represented by the `#` property.
 *
 * Several special grouping properties are also available. Their names start
 * with the `$` character.
 *
 *		// Check if <div> can be contained in a <p> element.
 *		alert( !!CKEDITOR.dtd[ 'p' ][ 'div' ] ); // false
 *
 *		// Check if <p> can be contained in a <div> element.
 *		alert( !!CKEDITOR.dtd[ 'div' ][ 'p' ] ); // true
 *
 *		// Check if <p> is a block element.
 *		alert( !!CKEDITOR.dtd.$block[ 'p' ] ); // true
 *
 * @class CKEDITOR.dtd
 * @singleton
 */
CKEDITOR.dtd = ( function() {
	'use strict';

	var X = CKEDITOR.tools.extend,
		// Subtraction rest of sets, from the first set.
		Y = function( source, removed ) {
			var substracted = CKEDITOR.tools.clone( source );
			for ( var i = 1; i < arguments.length; i++ ) {
				removed = arguments[ i ];
				for ( var name in removed )
					delete substracted[ name ];
			}
			return substracted;
		};

	// Phrasing elements.
	// P = { a: 1, em: 1, strong: 1, small: 1, abbr: 1, dfn: 1, i: 1, b: 1, s: 1,
	//		u: 1, code: 1, 'var': 1, samp: 1, kbd: 1, sup: 1, sub: 1, q: 1, cite: 1,
	//		span: 1, bdo: 1, bdi: 1, br: 1, wbr: 1, ins: 1, del: 1, img: 1, embed: 1,
	//		object: 1, iframe: 1, map: 1, area: 1, script: 1, noscript: 1, ruby: 1,
	//		video: 1, audio: 1, input: 1, textarea: 1, select: 1, button: 1, label: 1,
	//		output: 1, keygen: 1, progress: 1, command: 1, canvas: 1, time: 1,
	//		meter: 1, detalist: 1 },

	// Flow elements.
	// F = { a: 1, p: 1, hr: 1, pre: 1, ul: 1, ol: 1, dl: 1, div: 1, h1: 1, h2: 1,
	//		h3: 1, h4: 1, h5: 1, h6: 1, hgroup: 1, address: 1, blockquote: 1, ins: 1,
	//		del: 1, object: 1, map: 1, noscript: 1, section: 1, nav: 1, article: 1,
	//		aside: 1, header: 1, footer: 1, video: 1, audio: 1, figure: 1, table: 1,
	//		form: 1, fieldset: 1, menu: 1, canvas: 1, details:1 },

	// Text can be everywhere.
	// X( P, T );
	// Flow elements set consists of phrasing elements set.
	// X( F, P );

	var P = {}, F = {},
		// Intersection of flow elements set and phrasing elements set.
		PF = {
			a: 1, abbr: 1, area: 1, audio: 1, b: 1, bdi: 1, bdo: 1, br: 1, button: 1, canvas: 1, cite: 1,
			code: 1, command: 1, datalist: 1, del: 1, dfn: 1, em: 1, embed: 1, i: 1, iframe: 1, img: 1,
			input: 1, ins: 1, kbd: 1, keygen: 1, label: 1, map: 1, mark: 1, meter: 1, noscript: 1, object: 1,
			output: 1, progress: 1, q: 1, ruby: 1, s: 1, samp: 1, script: 1, select: 1, small: 1, span: 1,
			strong: 1, sub: 1, sup: 1, textarea: 1, time: 1, u: 1, 'var': 1, video: 1, wbr: 1
		},
		// F - PF (Flow Only).
		FO = {
			address: 1, article: 1, aside: 1, blockquote: 1, details: 1, div: 1, dl: 1, fieldset: 1,
			figure: 1, footer: 1, form: 1, h1: 1, h2: 1, h3: 1, h4: 1, h5: 1, h6: 1, header: 1, hgroup: 1,
			hr: 1, main: 1, menu: 1, nav: 1, ol: 1, p: 1, pre: 1, section: 1, table: 1, ul: 1
		},
		// Metadata elements.
		M = { command: 1, link: 1, meta: 1, noscript: 1, script: 1, style: 1 },
		// Empty.
		E = {},
		// Text.
		T = { '#': 1 },

		// Deprecated phrasing elements.
		DP = { acronym: 1, applet: 1, basefont: 1, big: 1, font: 1, isindex: 1, strike: 1, style: 1, tt: 1 }, // TODO remove "style".
		// Deprecated flow only elements.
		DFO = { center: 1, dir: 1, noframes: 1 };

	// Phrasing elements := PF + T + DP
	X( P, PF, T, DP );
	// Flow elements := FO + P + DFO
	X( F, FO, P, DFO );

	var dtd = {
		a: Y( P, { a: 1, button: 1 } ), // Treat as normal inline element (not a transparent one).
		abbr: P,
		address: F,
		area: E,
		article: F,
		aside: F,
		audio: X( { source: 1, track: 1 }, F ),
		b: P,
		base: E,
		bdi: P,
		bdo: P,
		blockquote: F,
		body: F,
		br: E,
		button: Y( P, { a: 1, button: 1 } ),
		canvas: P, // Treat as normal inline element (not a transparent one).
		caption: F,
		cite: P,
		code: P,
		col: E,
		colgroup: { col: 1 },
		command: E,
		datalist: X( { option: 1 }, P ),
		dd: F,
		del: P, // Treat as normal inline element (not a transparent one).
		details: X( { summary: 1 }, F ),
		dfn: P,
		div: F,
		dl: { dt: 1, dd: 1 },
		dt: F,
		em: P,
		embed: E,
		fieldset: X( { legend: 1 }, F ),
		figcaption: F,
		figure: X( { figcaption: 1 }, F ),
		footer: F,
		form: F,
		h1: P,
		h2: P,
		h3: P,
		h4: P,
		h5: P,
		h6: P,
		head: X( { title: 1, base: 1 }, M ),
		header: F,
		hgroup: { h1: 1, h2: 1, h3: 1, h4: 1, h5: 1, h6: 1 },
		hr: E,
		html: X( { head: 1, body: 1 }, F, M ), // Head and body are optional...
		i: P,
		iframe: T,
		img: E,
		input: E,
		ins: P, // Treat as normal inline element (not a transparent one).
		kbd: P,
		keygen: E,
		label: P,
		legend: P,
		li: F,
		link: E,
		// Can't be a descendant of article, aside, footer, header, nav, but we don't need this
		// complication. As well as checking if it's used only once.
		main: F,
		map: F,
		mark: P, // Treat as normal inline element (not a transparent one).
		menu: X( { li: 1 }, F ),
		meta: E,
		meter: Y( P, { meter: 1 } ),
		nav: F,
		noscript: X( { link: 1, meta: 1, style: 1 }, P ), // Treat as normal inline element (not a transparent one).
		object: X( { param: 1 }, P ), // Treat as normal inline element (not a transparent one).
		ol: { li: 1 },
		optgroup: { option: 1 },
		option: T,
		output: P,
		p: P,
		param: E,
		pre: P,
		progress: Y( P, { progress: 1 } ),
		q: P,
		rp: P,
		rt: P,
		ruby: X( { rp: 1, rt: 1 }, P ),
		s: P,
		samp: P,
		script: T,
		section: F,
		select: { optgroup: 1, option: 1 },
		small: P,
		source: E,
		span: P,
		strong: P,
		style: T,
		sub: P,
		summary: X( { h1: 1, h2: 1, h3: 1, h4: 1, h5: 1, h6: 1 }, P ),
		sup: P,
		table: { caption: 1, colgroup: 1, thead: 1, tfoot: 1, tbody: 1, tr: 1 },
		tbody: { tr: 1 },
		td: F,
		textarea: T,
		tfoot: { tr: 1 },
		th: F,
		thead: { tr: 1 },
		time: Y( P, { time: 1 } ),
		title: T,
		tr: { th: 1, td: 1 },
		track: E,
		u: P,
		ul: { li: 1 },
		'var': P,
		video: X( { source: 1, track: 1 }, F ),
		wbr: E,

		// Deprecated tags.
		acronym: P,
		applet: X( { param: 1 }, F ),
		basefont: E,
		big: P,
		center: F,
		dialog: E,
		dir: { li: 1 },
		font: P,
		isindex: E,
		noframes: F,
		strike: P,
		tt: P
	};

	X( dtd, {
		/**
		 * List of block elements, like `<p>` or `<div>`.
		 */
		$block: X( { audio: 1, dd: 1, dt: 1, figcaption: 1, li: 1, video: 1 }, FO, DFO ),

		/**
		 * List of elements that contain other blocks, in which block-level operations should be limited,
		 * this property is not intended to be checked directly, use {@link CKEDITOR.dom.elementPath#blockLimit} instead.
		 *
		 * Some examples of editor behaviors that are impacted by block limits:
		 *
		 * * Enter key never split a block-limit element;
		 * * Style application is constraint by the block limit of the current selection.
		 * * Pasted html will be inserted into the block limit of the current selection.
		 *
		 * **Note:** As an exception `<li>` is not considered as a block limit, as it's generally used as a text block.
		 */
		$blockLimit: {
			article: 1, aside: 1, audio: 1, body: 1, caption: 1, details: 1, dir: 1, div: 1, dl: 1,
			fieldset: 1, figcaption: 1, figure: 1, footer: 1, form: 1, header: 1, hgroup: 1, main: 1, menu: 1, nav: 1,
			ol: 1, section: 1, table: 1, td: 1, th: 1, tr: 1, ul: 1, video: 1
		},

		/**
		 * List of elements that contain character data.
		 */
		$cdata: { script: 1, style: 1 },

		/**
		 * List of elements that are accepted as inline editing hosts.
		 */
		$editable: {
			address: 1, article: 1, aside: 1, blockquote: 1, body: 1, details: 1, div: 1, fieldset: 1,
			figcaption: 1, footer: 1, form: 1, h1: 1, h2: 1, h3: 1, h4: 1, h5: 1, h6: 1, header: 1, hgroup: 1,
			main: 1, nav: 1, p: 1, pre: 1, section: 1
		},

		/**
		 * List of empty (self-closing) elements, like `<br>` or `<img>`.
		 */
		$empty: {
			area: 1, base: 1, basefont: 1, br: 1, col: 1, command: 1, dialog: 1, embed: 1, hr: 1, img: 1,
			input: 1, isindex: 1, keygen: 1, link: 1, meta: 1, param: 1, source: 1, track: 1, wbr: 1
		},

		/**
		 * List of inline (`<span>` like) elements.
		 */
		$inline: P,

		/**
		 * List of list root elements.
		 */
		$list: { dl: 1, ol: 1, ul: 1 },

		/**
		 * List of list item elements, like `<li>` or `<dd>`.
		 */
		$listItem: { dd: 1, dt: 1, li: 1 },

		/**
		 * List of elements which may live outside body.
		 */
		$nonBodyContent: X( { body: 1, head: 1, html: 1 }, dtd.head ),

		/**
		 * Elements that accept text nodes, but are not possible to edit into the browser.
		 */
		$nonEditable: {
			applet: 1, audio: 1, button: 1, embed: 1, iframe: 1, map: 1, object: 1, option: 1,
			param: 1, script: 1, textarea: 1, video: 1
		},

		/**
		 * Elements that are considered objects, therefore selected as a whole in the editor.
		 */
		$object: {
			applet: 1, audio: 1, button: 1, hr: 1, iframe: 1, img: 1, input: 1, object: 1, select: 1,
			table: 1, textarea: 1, video: 1
		},

		/**
		 * List of elements that can be ignored if empty, like `<b>` or `<span>`.
		 */
		$removeEmpty: {
			abbr: 1, acronym: 1, b: 1, bdi: 1, bdo: 1, big: 1, cite: 1, code: 1, del: 1, dfn: 1,
			em: 1, font: 1, i: 1, ins: 1, label: 1, kbd: 1, mark: 1, meter: 1, output: 1, q: 1, ruby: 1, s: 1,
			samp: 1, small: 1, span: 1, strike: 1, strong: 1, sub: 1, sup: 1, time: 1, tt: 1, u: 1, 'var': 1
		},

		/**
		 * List of elements that have tabindex set to zero by default.
		 */
		$tabIndex: { a: 1, area: 1, button: 1, input: 1, object: 1, select: 1, textarea: 1 },

		/**
		 * List of elements used inside the `<table>` element, like `<tbody>` or `<td>`.
		 */
		$tableContent: { caption: 1, col: 1, colgroup: 1, tbody: 1, td: 1, tfoot: 1, th: 1, thead: 1, tr: 1 },

		/**
		 * List of "transparent" elements. See [W3C's definition of "transparent" element](http://dev.w3.org/html5/markup/terminology.html#transparent).
		 */
		$transparent: { a: 1, audio: 1, canvas: 1, del: 1, ins: 1, map: 1, noscript: 1, object: 1, video: 1 },

		/**
		 * List of elements that are not to exist standalone that must live under it's parent element.
		 */
		$intermediate: {
			caption: 1, colgroup: 1, dd: 1, dt: 1, figcaption: 1, legend: 1, li: 1, optgroup: 1,
			option: 1, rp: 1, rt: 1, summary: 1, tbody: 1, td: 1, tfoot: 1, th: 1, thead: 1, tr: 1
		}
	} );

	return dtd;
} )();

// PACKAGER_RENAME( CKEDITOR.dtd )

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Defines the {@link CKEDITOR.dom.event} class, which
 *		represents the a native DOM event object.
 */

/**
 * Represents a native DOM event object.
 *
 * @class
 * @constructor Creates an event class instance.
 * @param {Object} domEvent A native DOM event object.
 */
CKEDITOR.dom.event = function( domEvent ) {
	/**
	 * The native DOM event object represented by this class instance.
	 *
	 * @readonly
	 */
	this.$ = domEvent;
};

CKEDITOR.dom.event.prototype = {
	/**
	 * Gets the key code associated to the event.
	 *
	 *		alert( event.getKey() ); // '65' is 'a' has been pressed
	 *
	 * @returns {Number} The key code.
	 */
	getKey: function() {
		return this.$.keyCode || this.$.which;
	},

	/**
	 * Gets a number represeting the combination of the keys pressed during the
	 * event. It is the sum with the current key code and the {@link CKEDITOR#CTRL},
	 * {@link CKEDITOR#SHIFT} and {@link CKEDITOR#ALT} constants.
	 *
	 *		alert( event.getKeystroke() == 65 );									// 'a' key
	 *		alert( event.getKeystroke() == CKEDITOR.CTRL + 65 );					// CTRL + 'a' key
	 *		alert( event.getKeystroke() == CKEDITOR.CTRL + CKEDITOR.SHIFT + 65 );	// CTRL + SHIFT + 'a' key
	 *
	 * @returns {Number} The number representing the keys combination.
	 */
	getKeystroke: function() {
		var keystroke = this.getKey();

		if ( this.$.ctrlKey || this.$.metaKey )
			keystroke += CKEDITOR.CTRL;

		if ( this.$.shiftKey )
			keystroke += CKEDITOR.SHIFT;

		if ( this.$.altKey )
			keystroke += CKEDITOR.ALT;

		return keystroke;
	},

	/**
	 * Prevents the original behavior of the event to happen. It can optionally
	 * stop propagating the event in the event chain.
	 *
	 *		var element = CKEDITOR.document.getById( 'myElement' );
	 *		element.on( 'click', function( ev ) {
	 *			// The DOM event object is passed by the 'data' property.
	 *			var domEvent = ev.data;
	 *			// Prevent the click to chave any effect in the element.
	 *			domEvent.preventDefault();
	 *		} );
	 *
	 * @param {Boolean} [stopPropagation=false] Stop propagating this event in the
	 * event chain.
	 */
	preventDefault: function( stopPropagation ) {
		var $ = this.$;
		if ( $.preventDefault )
			$.preventDefault();
		else
			$.returnValue = false;

		if ( stopPropagation )
			this.stopPropagation();
	},

	/**
	 * Stops this event propagation in the event chain.
	 */
	stopPropagation: function() {
		var $ = this.$;
		if ( $.stopPropagation )
			$.stopPropagation();
		else
			$.cancelBubble = true;
	},

	/**
	 * Returns the DOM node where the event was targeted to.
	 *
	 *		var element = CKEDITOR.document.getById( 'myElement' );
	 *		element.on( 'click', function( ev ) {
	 *			// The DOM event object is passed by the 'data' property.
	 *			var domEvent = ev.data;
	 *			// Add a CSS class to the event target.
	 *			domEvent.getTarget().addClass( 'clicked' );
	 *		} );
	 *
	 * @returns {CKEDITOR.dom.node} The target DOM node.
	 */
	getTarget: function() {
		var rawNode = this.$.target || this.$.srcElement;
		return rawNode ? new CKEDITOR.dom.node( rawNode ) : null;
	},

	/**
	 * Returns an integer value that indicates the current processing phase of an event.
	 * For browsers that doesn't support event phase, {@link CKEDITOR#EVENT_PHASE_AT_TARGET} is always returned.
	 *
	 * @returns {Number} One of {@link CKEDITOR#EVENT_PHASE_CAPTURING},
	 * {@link CKEDITOR#EVENT_PHASE_AT_TARGET}, or {@link CKEDITOR#EVENT_PHASE_BUBBLING}.
	 */
	getPhase: function() {
		return this.$.eventPhase || 2;
	},

	/**
	 * Retrieves the coordinates of the mouse pointer relative to the top-left
	 * corner of the document, in mouse related event.
	 *
	 *		element.on( 'mousemouse', function( ev ) {
	 *			var pageOffset = ev.data.getPageOffset();
	 *			alert( pageOffset.x );			// page offset X
	 *			alert( pageOffset.y );			// page offset Y
	 *     } );
	 *
	 * @returns {Object} The object contains the position.
	 * @returns {Number} return.x
	 * @returns {Number} return.y
	 */
	getPageOffset: function() {
		var doc = this.getTarget().getDocument().$;
		var pageX = this.$.pageX || this.$.clientX + ( doc.documentElement.scrollLeft || doc.body.scrollLeft );
		var pageY = this.$.pageY || this.$.clientY + ( doc.documentElement.scrollTop || doc.body.scrollTop );
		return { x: pageX, y: pageY };
	}
};

// For the followind constants, we need to go over the Unicode boundaries
// (0x10FFFF) to avoid collision.

/**
 * CTRL key (0x110000).
 *
 * @readonly
 * @property {Number} [=0x110000]
 * @member CKEDITOR
 */
CKEDITOR.CTRL = 0x110000;

/**
 * SHIFT key (0x220000).
 *
 * @readonly
 * @property {Number} [=0x220000]
 * @member CKEDITOR
 */
CKEDITOR.SHIFT = 0x220000;

/**
 * ALT key (0x440000).
 *
 * @readonly
 * @property {Number} [=0x440000]
 * @member CKEDITOR
 */
CKEDITOR.ALT = 0x440000;

/**
 * Capturing phase.
 *
 * @readonly
 * @property {Number} [=1]
 * @member CKEDITOR
 */
CKEDITOR.EVENT_PHASE_CAPTURING = 1;

/**
 * Event at target.
 *
 * @readonly
 * @property {Number} [=2]
 * @member CKEDITOR
 */
CKEDITOR.EVENT_PHASE_AT_TARGET = 2;

/**
 * Bubbling phase.
 *
 * @readonly
 * @property {Number} [=3]
 * @member CKEDITOR
 */
CKEDITOR.EVENT_PHASE_BUBBLING = 3;

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Defines the {@link CKEDITOR.editor} class, which is the base
 *		for other classes representing DOM objects.
 */

/**
 * Represents a DOM object. This class is not intended to be used directly. It
 * serves as the base class for other classes representing specific DOM
 * objects.
 *
 * @class
 * @mixins CKEDITOR.event
 * @constructor Creates a domObject class instance.
 * @param {Object} nativeDomObject A native DOM object.
 */
CKEDITOR.dom.domObject = function( nativeDomObject ) {
	if ( nativeDomObject ) {
		/**
		 * The native DOM object represented by this class instance.
		 *
		 *		var element = new CKEDITOR.dom.element( 'span' );
		 *		alert( element.$.nodeType ); // '1'
		 *
		 * @readonly
		 * @property {Object}
		 */
		this.$ = nativeDomObject;
	}
};

CKEDITOR.dom.domObject.prototype = ( function() {
	// Do not define other local variables here. We want to keep the native
	// listener closures as clean as possible.

	var getNativeListener = function( domObject, eventName ) {
			return function( domEvent ) {
				// In FF, when reloading the page with the editor focused, it may
				// throw an error because the CKEDITOR global is not anymore
				// available. So, we check it here first. (https://dev.ckeditor.com/ticket/2923)
				if ( typeof CKEDITOR != 'undefined' )
					domObject.fire( eventName, new CKEDITOR.dom.event( domEvent ) );
			};
		};

	return {

		/**
		 * Gets the private `_` object which is bound to the native
		 * DOM object using {@link #getCustomData}.
		 *
		 *		var elementA = new CKEDITOR.dom.element( nativeElement );
		 *		elementA.getPrivate().value = 1;
		 *		...
		 *		var elementB = new CKEDITOR.dom.element( nativeElement );
		 *		elementB.getPrivate().value; // 1
		 *
		 * @returns {Object} The private object.
		 */
		getPrivate: function() {
			var priv;

			// Get the main private object from the custom data. Create it if not defined.
			if ( !( priv = this.getCustomData( '_' ) ) )
				this.setCustomData( '_', ( priv = {} ) );

			return priv;
		},

		// Docs inherited from event.
		on: function( eventName ) {
			// We customize the "on" function here. The basic idea is that we'll have
			// only one listener for a native event, which will then call all listeners
			// set to the event.

			// Get the listeners holder object.
			var nativeListeners = this.getCustomData( '_cke_nativeListeners' );

			if ( !nativeListeners ) {
				nativeListeners = {};
				this.setCustomData( '_cke_nativeListeners', nativeListeners );
			}

			// Check if we have a listener for that event.
			if ( !nativeListeners[ eventName ] ) {
				var listener = nativeListeners[ eventName ] = getNativeListener( this, eventName );

				if ( this.$.addEventListener )
					this.$.addEventListener( eventName, listener, !!CKEDITOR.event.useCapture );
				else if ( this.$.attachEvent )
					this.$.attachEvent( 'on' + eventName, listener );
			}

			// Call the original implementation.
			return CKEDITOR.event.prototype.on.apply( this, arguments );
		},

		// Docs inherited from event.
		removeListener: function( eventName ) {
			// Call the original implementation.
			CKEDITOR.event.prototype.removeListener.apply( this, arguments );

			// If we don't have listeners for this event, clean the DOM up.
			if ( !this.hasListeners( eventName ) ) {
				var nativeListeners = this.getCustomData( '_cke_nativeListeners' );
				var listener = nativeListeners && nativeListeners[ eventName ];
				if ( listener ) {
					if ( this.$.removeEventListener )
						this.$.removeEventListener( eventName, listener, false );
					else if ( this.$.detachEvent )
						this.$.detachEvent( 'on' + eventName, listener );

					delete nativeListeners[ eventName ];
				}
			}
		},

		/**
		 * Removes any listener set on this object.
		 *
		 * To avoid memory leaks we must assure that there are no
		 * references left after the object is no longer needed.
		 */
		removeAllListeners: function() {
			var nativeListeners = this.getCustomData( '_cke_nativeListeners' );
			for ( var eventName in nativeListeners ) {
				var listener = nativeListeners[ eventName ];
				if ( this.$.detachEvent )
					this.$.detachEvent( 'on' + eventName, listener );
				else if ( this.$.removeEventListener )
					this.$.removeEventListener( eventName, listener, false );

				delete nativeListeners[ eventName ];
			}

			// Remove events from events object so fire() method will not call
			// listeners (https://dev.ckeditor.com/ticket/11400).
			CKEDITOR.event.prototype.removeAllListeners.call( this );
		}
	};
} )();

( function( domObjectProto ) {
	var customData = {};

	CKEDITOR.on( 'reset', function() {
		customData = {};
	} );

	/**
	 * Determines whether the specified object is equal to the current object.
	 *
	 *		var doc = new CKEDITOR.dom.document( document );
	 *		alert( doc.equals( CKEDITOR.document ) );	// true
	 *		alert( doc == CKEDITOR.document );			// false
	 *
	 * @param {Object} object The object to compare with the current object.
	 * @returns {Boolean} `true` if the object is equal.
	 */
	domObjectProto.equals = function( object ) {
		// Try/Catch to avoid IE permission error when object is from different document.
		try {
			return ( object && object.$ === this.$ );
		} catch ( er ) {
			return false;
		}
	};

	/**
	 * Sets a data slot value for this object. These values are shared by all
	 * instances pointing to that same DOM object.
	 *
	 * **Note:** The created data slot is only guaranteed to be available on this unique DOM node,
	 * thus any wish to continue access to it from other element clones (either created by
	 * clone node or from `innerHtml`) will fail. For such usage please use
	 * {@link CKEDITOR.dom.element#setAttribute} instead.
	 *
	 * **Note**: This method does not work on text nodes prior to Internet Explorer 9.
	 *
	 *		var element = new CKEDITOR.dom.element( 'span' );
	 *		element.setCustomData( 'hasCustomData', true );
	 *
	 * @param {String} key A key used to identify the data slot.
	 * @param {Object} value The value to set to the data slot.
	 * @returns {CKEDITOR.dom.domObject} This DOM object instance.
	 * @chainable
	 */
	domObjectProto.setCustomData = function( key, value ) {
		var expandoNumber = this.getUniqueId(),
			dataSlot = customData[ expandoNumber ] || ( customData[ expandoNumber ] = {} );

		dataSlot[ key ] = value;

		return this;
	};

	/**
	 * Gets the value set to a data slot in this object.
	 *
	 *		var element = new CKEDITOR.dom.element( 'span' );
	 *		alert( element.getCustomData( 'hasCustomData' ) );		// e.g. 'true'
	 *		alert( element.getCustomData( 'nonExistingKey' ) );		// null
	 *
	 * @param {String} key The key used to identify the data slot.
	 * @returns {Object} This value set to the data slot.
	 */
	domObjectProto.getCustomData = function( key ) {
		var expandoNumber = this.$[ 'data-cke-expando' ],
			dataSlot = expandoNumber && customData[ expandoNumber ];

		return ( dataSlot && key in dataSlot ) ? dataSlot[ key ] : null;
	};

	/**
	 * Removes the value in the data slot under the given `key`.
	 *
	 * @param {String} key
	 * @returns {Object} Removed value or `null` if not found.
	 */
	domObjectProto.removeCustomData = function( key ) {
		var expandoNumber = this.$[ 'data-cke-expando' ],
			dataSlot = expandoNumber && customData[ expandoNumber ],
			retval, hadKey;

		if ( dataSlot ) {
			retval = dataSlot[ key ];
			hadKey = key in dataSlot;
			delete dataSlot[ key ];
		}

		return hadKey ? retval : null;
	};

	/**
	 * Removes any data stored in this object.
	 * To avoid memory leaks we must assure that there are no
	 * references left after the object is no longer needed.
	 */
	domObjectProto.clearCustomData = function() {
		// Clear all event listeners
		this.removeAllListeners();

		var expandoNumber = this.$[ 'data-cke-expando' ];
		expandoNumber && delete customData[ expandoNumber ];
	};

	/**
	 * Gets an ID that can be used to identify this DOM object in
	 * the running session.
	 *
	 * **Note**: This method does not work on text nodes prior to Internet Explorer 9.
	 *
	 * @returns {Number} A unique ID.
	 */
	domObjectProto.getUniqueId = function() {
		return this.$[ 'data-cke-expando' ] || ( this.$[ 'data-cke-expando' ] = CKEDITOR.tools.getNextNumber() );
	};

	// Implement CKEDITOR.event.
	CKEDITOR.event.implementOn( domObjectProto );

} )( CKEDITOR.dom.domObject.prototype );

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Defines the {@link CKEDITOR.dom.node} class which is the base
 *		class for classes that represent DOM nodes.
 */

/**
 * Base class for classes representing DOM nodes. This constructor may return
 * an instance of a class that inherits from this class, like
 * {@link CKEDITOR.dom.element} or {@link CKEDITOR.dom.text}.
 *
 * @class
 * @extends CKEDITOR.dom.domObject
 * @constructor Creates a node class instance.
 * @param {Object} domNode A native DOM node.
 * @see CKEDITOR.dom.element
 * @see CKEDITOR.dom.text
 */
CKEDITOR.dom.node = function( domNode ) {
	if ( domNode ) {
		var type =
			domNode.nodeType == CKEDITOR.NODE_DOCUMENT ? 'document' :
			domNode.nodeType == CKEDITOR.NODE_ELEMENT ? 'element' :
			domNode.nodeType == CKEDITOR.NODE_TEXT ? 'text' :
			domNode.nodeType == CKEDITOR.NODE_COMMENT ? 'comment' :
			domNode.nodeType == CKEDITOR.NODE_DOCUMENT_FRAGMENT ? 'documentFragment' :
			'domObject'; // Call the base constructor otherwise.

		return new CKEDITOR.dom[ type ]( domNode );
	}

	return this;
};

CKEDITOR.dom.node.prototype = new CKEDITOR.dom.domObject();

/**
 * Element node type.
 *
 * @readonly
 * @property {Number} [=1]
 * @member CKEDITOR
 */
CKEDITOR.NODE_ELEMENT = 1;

/**
 * Document node type.
 *
 * @readonly
 * @property {Number} [=9]
 * @member CKEDITOR
 */
CKEDITOR.NODE_DOCUMENT = 9;

/**
 * Text node type.
 *
 * @readonly
 * @property {Number} [=3]
 * @member CKEDITOR
 */
CKEDITOR.NODE_TEXT = 3;

/**
 * Comment node type.
 *
 * @readonly
 * @property {Number} [=8]
 * @member CKEDITOR
 */
CKEDITOR.NODE_COMMENT = 8;

/**
 * Document fragment node type.
 *
 * @readonly
 * @property {Number} [=11]
 * @member CKEDITOR
 */
CKEDITOR.NODE_DOCUMENT_FRAGMENT = 11;

/**
 * Indicates that positions of both nodes are identical (this is the same node). See {@link CKEDITOR.dom.node#getPosition}.
 *
 * @readonly
 * @property {Number} [=0]
 * @member CKEDITOR
 */
CKEDITOR.POSITION_IDENTICAL = 0;

/**
 * Indicates that nodes are in different (detached) trees. See {@link CKEDITOR.dom.node#getPosition}.
 *
 * @readonly
 * @property {Number} [=1]
 * @member CKEDITOR
 */
CKEDITOR.POSITION_DISCONNECTED = 1;

/**
 * Indicates that the context node follows the other node. See {@link CKEDITOR.dom.node#getPosition}.
 *
 * @readonly
 * @property {Number} [=2]
 * @member CKEDITOR
 */
CKEDITOR.POSITION_FOLLOWING = 2;

/**
 * Indicates that the context node precedes the other node. See {@link CKEDITOR.dom.node#getPosition}.
 *
 * @readonly
 * @property {Number} [=4]
 * @member CKEDITOR
 */
CKEDITOR.POSITION_PRECEDING = 4;

/**
 * Indicates that the context node is a descendant of the other node. See {@link CKEDITOR.dom.node#getPosition}.
 *
 * @readonly
 * @property {Number} [=8]
 * @member CKEDITOR
 */
CKEDITOR.POSITION_IS_CONTAINED = 8;

/**
 * Indicates that the context node contains the other node. See {@link CKEDITOR.dom.node#getPosition}.
 *
 * @readonly
 * @property {Number} [=16]
 * @member CKEDITOR
 */
CKEDITOR.POSITION_CONTAINS = 16;

CKEDITOR.tools.extend( CKEDITOR.dom.node.prototype, {
	/**
	 * Makes this node a child of another element.
	 *
	 *		var p = new CKEDITOR.dom.element( 'p' );
	 *		var strong = new CKEDITOR.dom.element( 'strong' );
	 *		strong.appendTo( p );
	 *
	 *		// Result: '<p><strong></strong></p>'.
	 *
	 * @param {CKEDITOR.dom.element} element The target element to which this node will be appended.
	 * @returns {CKEDITOR.dom.element} The target element.
	 */
	appendTo: function( element, toStart ) {
		element.append( this, toStart );
		return element;
	},

	/**
	 * Clones this node.
	 *
	 * **Note**: Values set by {#setCustomData} will not be available in the clone.
	 *
	 * @param {Boolean} [includeChildren=false] If `true` then all node's
	 * children will be cloned recursively.
	 * @param {Boolean} [cloneId=false] Whether ID attributes should be cloned, too.
	 * @returns {CKEDITOR.dom.node} Clone of this node.
	 */
	clone: function( includeChildren, cloneId ) {
		var $clone = this.$.cloneNode( includeChildren );

		// The "id" attribute should never be cloned to avoid duplication.
		removeIds( $clone );

		var node = new CKEDITOR.dom.node( $clone );

		// On IE8 we need to fixed HTML5 node name, see details below.
		if ( CKEDITOR.env.ie && CKEDITOR.env.version < 9 &&
			( this.type == CKEDITOR.NODE_ELEMENT || this.type == CKEDITOR.NODE_DOCUMENT_FRAGMENT ) ) {
			renameNodes( node );
		}

		return node;

		function removeIds( node ) {
			// Reset data-cke-expando only when has been cloned (IE and only for some types of objects).
			if ( node[ 'data-cke-expando' ] )
				node[ 'data-cke-expando' ] = false;

			if ( node.nodeType != CKEDITOR.NODE_ELEMENT && node.nodeType != CKEDITOR.NODE_DOCUMENT_FRAGMENT  )
				return;

			if ( !cloneId && node.nodeType == CKEDITOR.NODE_ELEMENT )
				node.removeAttribute( 'id', false );

			if ( includeChildren ) {
				var childs = node.childNodes;
				for ( var i = 0; i < childs.length; i++ )
					removeIds( childs[ i ] );
			}
		}

		// IE8 rename HTML5 nodes by adding `:` at the begging of the tag name when the node is cloned,
		// so `<figure>` will be `<:figure>` after 'cloneNode'. We need to fix it (https://dev.ckeditor.com/ticket/13101).
		function renameNodes( node ) {
			if ( node.type != CKEDITOR.NODE_ELEMENT && node.type != CKEDITOR.NODE_DOCUMENT_FRAGMENT )
				return;

			if ( node.type != CKEDITOR.NODE_DOCUMENT_FRAGMENT ) {
				var name = node.getName();
				if ( name[ 0 ] == ':' ) {
					node.renameNode( name.substring( 1 ) );
				}
			}

			if ( includeChildren ) {
				for ( var i = 0; i < node.getChildCount(); i++ )
					renameNodes( node.getChild( i ) );
			}
		}
	},

	/**
	 * Checks if the node is preceded by any sibling.
	 *
	 * @returns {Boolean}
	 */
	hasPrevious: function() {
		return !!this.$.previousSibling;
	},

	/**
	 * Checks if the node is succeeded by any sibling.
	 *
	 * @returns {Boolean}
	 */
	hasNext: function() {
		return !!this.$.nextSibling;
	},

	/**
	 * Inserts this element after a node.
	 *
	 *		var em = new CKEDITOR.dom.element( 'em' );
	 *		var strong = new CKEDITOR.dom.element( 'strong' );
	 *		strong.insertAfter( em );
	 *
	 *		// Result: '<em></em><strong></strong>'
	 *
	 * @param {CKEDITOR.dom.node} node The node that will precede this element.
	 * @returns {CKEDITOR.dom.node} The node preceding this one after insertion.
	 */
	insertAfter: function( node ) {
		node.$.parentNode.insertBefore( this.$, node.$.nextSibling );
		return node;
	},

	/**
	 * Inserts this element before a node.
	 *
	 *		var em = new CKEDITOR.dom.element( 'em' );
	 *		var strong = new CKEDITOR.dom.element( 'strong' );
	 *		strong.insertBefore( em );
	 *
	 *		// result: '<strong></strong><em></em>'
	 *
	 * @param {CKEDITOR.dom.node} node The node that will succeed this element.
	 * @returns {CKEDITOR.dom.node} The node being inserted.
	 */
	insertBefore: function( node ) {
		node.$.parentNode.insertBefore( this.$, node.$ );
		return node;
	},

	/**
	 * Inserts a node before this node.
	 *
	 *		var em = new CKEDITOR.dom.element( 'em' );
	 *		var strong = new CKEDITOR.dom.element( 'strong' );
	 *		strong.insertBeforeMe( em );
	 *
	 *		// result: '<em></em><strong></strong>'
	 *
	 * @param {CKEDITOR.dom.node} node The node that will preceed this element.
	 * @returns {CKEDITOR.dom.node} The node being inserted.
	 */
	insertBeforeMe: function( node ) {
		this.$.parentNode.insertBefore( node.$, this.$ );
		return node;
	},

	/**
	 * Retrieves a uniquely identifiable tree address for this node.
	 * The tree address returned is an array of integers, with each integer
	 * indicating a child index of a DOM node, starting from
	 * `document.documentElement`.
	 *
	 * For example, assuming `<body>` is the second child
	 * of `<html>` (`<head>` being the first),
	 * and we would like to address the third child under the
	 * fourth child of `<body>`, the tree address returned would be:
	 * `[1, 3, 2]`.
	 *
	 * The tree address cannot be used for finding back the DOM tree node once
	 * the DOM tree structure has been modified.
	 *
	 * @param {Boolean} [normalized=false] See {@link #getIndex}.
	 * @returns {Array} The address.
	 */
	getAddress: function( normalized ) {
		var address = [];
		var $documentElement = this.getDocument().$.documentElement;
		var node = this.$;

		while ( node && node != $documentElement ) {
			var parentNode = node.parentNode;

			if ( parentNode ) {
				// Get the node index. For performance, call getIndex
				// directly, instead of creating a new node object.
				address.unshift( this.getIndex.call( { $: node }, normalized ) );
			}

			node = parentNode;
		}

		return address;
	},

	/**
	 * Gets the document containing this element.
	 *
	 *		var element = CKEDITOR.document.getById( 'example' );
	 *		alert( element.getDocument().equals( CKEDITOR.document ) ); // true
	 *
	 * @returns {CKEDITOR.dom.document} The document.
	 */
	getDocument: function() {
		return new CKEDITOR.dom.document( this.$.ownerDocument || this.$.parentNode.ownerDocument );
	},

	/**
	 * Gets the index of a node in an array of its `parent.childNodes`.
	 * Returns `-1` if a node does not have a parent or when the `normalized` argument is set to `true`
	 * and the text node is empty and will be removed during the normalization.
	 *
	 * Let us assume having the following `childNodes` array:
	 *
	 *		[ emptyText, element1, text, text, element2, emptyText2 ]
	 *
	 *		emptyText.getIndex()			// 0
	 *		emptyText.getIndex( true )		// -1
	 *		element1.getIndex();			// 1
	 *		element1.getIndex( true );		// 0
	 *		element2.getIndex();			// 4
	 *		element2.getIndex( true );		// 2
	 *		emptyText2.getIndex();			// 5
	 *		emptyText2.getIndex( true );	// -1
	 *
	 * @param {Boolean} normalized When `true`, adjacent text nodes are merged and empty text nodes are removed.
	 * @returns {Number} Index of a node or `-1` if a node does not have a parent or is removed during the normalization.
	 */
	getIndex: function( normalized ) {
		// Attention: getAddress depends on this.$
		// getIndex is called on a plain object: { $ : node }

		var current = this.$,
			index = -1,
			isNormalizing;

		if ( !this.$.parentNode )
			return -1;

		// The idea is - all empty text nodes will be virtually merged into their adjacent text nodes.
		// If an empty text node does not have an adjacent non-empty text node we can return -1 straight away,
		// because it and all its sibling text nodes will be merged into an empty text node and then totally ignored.
		if ( normalized && current.nodeType == CKEDITOR.NODE_TEXT && isEmpty( current ) ) {
			var adjacent = getAdjacentNonEmptyTextNode( current ) || getAdjacentNonEmptyTextNode( current, true );

			if ( !adjacent )
				return -1;
		}

		do {
			// Bypass blank node and adjacent text nodes.
			if ( normalized && current != this.$ && current.nodeType == CKEDITOR.NODE_TEXT && ( isNormalizing || isEmpty( current ) ) )
				continue;

			index++;
			isNormalizing = current.nodeType == CKEDITOR.NODE_TEXT;
		}
		while ( ( current = current.previousSibling ) );

		return index;

		function getAdjacentNonEmptyTextNode( node, lookForward ) {
			var sibling = lookForward ? node.nextSibling : node.previousSibling;

			if ( !sibling || sibling.nodeType != CKEDITOR.NODE_TEXT ) {
				return null;
			}

			// If found a non-empty text node, then return it.
			// If not, then continue search.
			return isEmpty( sibling ) ? getAdjacentNonEmptyTextNode( sibling, lookForward ) : sibling;
		}

		// Checks whether a text node is empty or is FCSeq string (which will be totally removed when normalizing).
		function isEmpty( textNode ) {
			return !textNode.nodeValue || textNode.nodeValue == CKEDITOR.dom.selection.FILLING_CHAR_SEQUENCE;
		}
	},

	/**
	 * @todo
	 */
	getNextSourceNode: function( startFromSibling, nodeType, guard ) {
		// If "guard" is a node, transform it in a function.
		if ( guard && !guard.call ) {
			var guardNode = guard;
			guard = function( node ) {
				return !node.equals( guardNode );
			};
		}

		var node = ( !startFromSibling && this.getFirst && this.getFirst() ),
			parent;

		// Guarding when we're skipping the current element( no children or 'startFromSibling' ).
		// send the 'moving out' signal even we don't actually dive into.
		if ( !node ) {
			if ( this.type == CKEDITOR.NODE_ELEMENT && guard && guard( this, true ) === false )
				return null;
			node = this.getNext();
		}

		while ( !node && ( parent = ( parent || this ).getParent() ) ) {
			// The guard check sends the "true" paramenter to indicate that
			// we are moving "out" of the element.
			if ( guard && guard( parent, true ) === false )
				return null;

			node = parent.getNext();
		}

		if ( !node )
			return null;

		if ( guard && guard( node ) === false )
			return null;

		if ( nodeType && nodeType != node.type )
			return node.getNextSourceNode( false, nodeType, guard );

		return node;
	},

	/**
	 * @todo
	 */
	getPreviousSourceNode: function( startFromSibling, nodeType, guard ) {
		if ( guard && !guard.call ) {
			var guardNode = guard;
			guard = function( node ) {
				return !node.equals( guardNode );
			};
		}

		var node = ( !startFromSibling && this.getLast && this.getLast() ),
			parent;

		// Guarding when we're skipping the current element( no children or 'startFromSibling' ).
		// send the 'moving out' signal even we don't actually dive into.
		if ( !node ) {
			if ( this.type == CKEDITOR.NODE_ELEMENT && guard && guard( this, true ) === false )
				return null;
			node = this.getPrevious();
		}

		while ( !node && ( parent = ( parent || this ).getParent() ) ) {
			// The guard check sends the "true" paramenter to indicate that
			// we are moving "out" of the element.
			if ( guard && guard( parent, true ) === false )
				return null;

			node = parent.getPrevious();
		}

		if ( !node )
			return null;

		if ( guard && guard( node ) === false )
			return null;

		if ( nodeType && node.type != nodeType )
			return node.getPreviousSourceNode( false, nodeType, guard );

		return node;
	},

	/**
	 * Gets the node that preceeds this element in its parent's child list.
	 *
	 *		var element = CKEDITOR.dom.element.createFromHtml( '<div><i>prev</i><b>Example</b></div>' );
	 *		var first = element.getLast().getPrev();
	 *		alert( first.getName() ); // 'i'
	 *
	 * @param {Function} [evaluator] Filtering the result node.
	 * @returns {CKEDITOR.dom.node} The previous node or null if not available.
	 */
	getPrevious: function( evaluator ) {
		var previous = this.$,
			retval;
		do {
			previous = previous.previousSibling;

			// Avoid returning the doc type node.
			// http://www.w3.org/TR/REC-DOM-Level-1/level-one-core.html#ID-412266927
			retval = previous && previous.nodeType != 10 && new CKEDITOR.dom.node( previous );
		}
		while ( retval && evaluator && !evaluator( retval ) );
		return retval;
	},

	/**
	 * Gets the node that follows this element in its parent's child list.
	 *
	 *		var element = CKEDITOR.dom.element.createFromHtml( '<div><b>Example</b><i>next</i></div>' );
	 *		var last = element.getFirst().getNext();
	 *		alert( last.getName() ); // 'i'
	 *
	 * @param {Function} [evaluator] Filtering the result node.
	 * @returns {CKEDITOR.dom.node} The next node or null if not available.
	 */
	getNext: function( evaluator ) {
		var next = this.$,
			retval;
		do {
			next = next.nextSibling;
			retval = next && new CKEDITOR.dom.node( next );
		}
		while ( retval && evaluator && !evaluator( retval ) );
		return retval;
	},

	/**
	 * Gets the parent element for this node.
	 *
	 *		var node = editor.document.getBody().getFirst();
	 *		var parent = node.getParent();
	 *		alert( parent.getName() ); // 'body'
	 *
	 * @param {Boolean} [allowFragmentParent=false] Consider also parent node that is of
	 * fragment type {@link CKEDITOR#NODE_DOCUMENT_FRAGMENT}.
	 * @returns {CKEDITOR.dom.element} The parent element.
	 */
	getParent: function( allowFragmentParent ) {
		var parent = this.$.parentNode;
		return ( parent && ( parent.nodeType == CKEDITOR.NODE_ELEMENT || allowFragmentParent && parent.nodeType == CKEDITOR.NODE_DOCUMENT_FRAGMENT ) ) ? new CKEDITOR.dom.node( parent ) : null;
	},

	/**
	 * Returns an array containing node parents and the node itself. By default nodes are in _descending_ order.
	 *
	 *		// Assuming that body has paragraph as the first child.
	 *		var node = editor.document.getBody().getFirst();
	 *		var parents = node.getParents();
	 *		alert( parents[ 0 ].getName() + ',' + parents[ 2 ].getName() ); // 'html,p'
	 *
	 * @param {Boolean} [closerFirst=false] Determines the order of returned nodes.
	 * @returns {Array} Returns an array of {@link CKEDITOR.dom.node}.
	 */
	getParents: function( closerFirst ) {
		var node = this;
		var parents = [];

		do {
			parents[ closerFirst ? 'push' : 'unshift' ]( node );
		}
		while ( ( node = node.getParent() ) );

		return parents;
	},

	/**
	 * @todo
	 */
	getCommonAncestor: function( node ) {
		if ( node.equals( this ) )
			return this;

		if ( node.contains && node.contains( this ) )
			return node;

		var start = this.contains ? this : this.getParent();

		do {
			if ( start.contains( node ) ) return start;
		}
		while ( ( start = start.getParent() ) );

		return null;
	},

	/**
	 * Determines the position relation between this node and the given {@link CKEDITOR.dom.node} in the document.
	 * This node can be preceding ({@link CKEDITOR#POSITION_PRECEDING}) or following ({@link CKEDITOR#POSITION_FOLLOWING})
	 * the given node. This node can also contain ({@link CKEDITOR#POSITION_CONTAINS}) or be contained by
	 * ({@link CKEDITOR#POSITION_IS_CONTAINED}) the given node. The function returns a bitmask of constants
	 * listed above or {@link CKEDITOR#POSITION_IDENTICAL} if the given node is the same as this node.
	 *
	 * @param {CKEDITOR.dom.node} otherNode A node to check relation with.
	 * @returns {Number} Position relation between this node and given node.
	 */
	getPosition: function( otherNode ) {
		var $ = this.$;
		var $other = otherNode.$;

		if ( $.compareDocumentPosition )
			return $.compareDocumentPosition( $other );

		// IE and Safari have no support for compareDocumentPosition.

		if ( $ == $other )
			return CKEDITOR.POSITION_IDENTICAL;

		// Only element nodes support contains and sourceIndex.
		if ( this.type == CKEDITOR.NODE_ELEMENT && otherNode.type == CKEDITOR.NODE_ELEMENT ) {
			if ( $.contains ) {
				if ( $.contains( $other ) )
					return CKEDITOR.POSITION_CONTAINS + CKEDITOR.POSITION_PRECEDING;

				if ( $other.contains( $ ) )
					return CKEDITOR.POSITION_IS_CONTAINED + CKEDITOR.POSITION_FOLLOWING;
			}

			if ( 'sourceIndex' in $ )
				return ( $.sourceIndex < 0 || $other.sourceIndex < 0 ) ? CKEDITOR.POSITION_DISCONNECTED : ( $.sourceIndex < $other.sourceIndex ) ? CKEDITOR.POSITION_PRECEDING : CKEDITOR.POSITION_FOLLOWING;

		}

		// For nodes that don't support compareDocumentPosition, contains
		// or sourceIndex, their "address" is compared.

		var addressOfThis = this.getAddress(),
			addressOfOther = otherNode.getAddress(),
			minLevel = Math.min( addressOfThis.length, addressOfOther.length );

		// Determinate preceding/following relationship.
		for ( var i = 0; i < minLevel; i++ ) {
			if ( addressOfThis[ i ] != addressOfOther[ i ] ) {
				return addressOfThis[ i ] < addressOfOther[ i ] ? CKEDITOR.POSITION_PRECEDING : CKEDITOR.POSITION_FOLLOWING;
			}
		}

		// Determinate contains/contained relationship.
		return ( addressOfThis.length < addressOfOther.length ) ? CKEDITOR.POSITION_CONTAINS + CKEDITOR.POSITION_PRECEDING : CKEDITOR.POSITION_IS_CONTAINED + CKEDITOR.POSITION_FOLLOWING;
	},

	/**
	 * Gets the closest ancestor node of this node, specified by its name or using an evaluator function.
	 *
	 *		// Suppose we have the following HTML structure:
	 *		// <div id="outer"><div id="inner"><p><b>Some text</b></p></div></div>
	 *		// If node == <b>
	 *		ascendant = node.getAscendant( 'div' );				// ascendant == <div id="inner">
	 *		ascendant = node.getAscendant( 'b' );				// ascendant == null
	 *		ascendant = node.getAscendant( 'b', true );			// ascendant == <b>
	 *		ascendant = node.getAscendant( { div:1, p:1 } );	// Searches for the first 'div' or 'p': ascendant == <div id="inner">
	 *
	 *		// Using custom evaluator:
	 *		ascendant = node.getAscendant( function( el ) {
	 *			return el.getId() == 'inner';
	 *		} );
	 *		// ascendant == <div id="inner">
	 *
	 * @since 3.6.1
	 * @param {String/Function/Object} query The name of the ancestor node to search or
	 * an object with the node names to search for or an evaluator function.
	 * @param {Boolean} [includeSelf] Whether to include the current
	 * node in the search.
	 * @returns {CKEDITOR.dom.node} The located ancestor node or `null` if not found.
	 */
	getAscendant: function( query, includeSelf ) {
		var $ = this.$,
			evaluator,
			isCustomEvaluator;

		if ( !includeSelf ) {
			$ = $.parentNode;
		}

		// Custom checker provided in an argument.
		if ( typeof query == 'function' ) {
			isCustomEvaluator = true;
			evaluator = query;
		} else {
			// Predefined tag name checker.
			isCustomEvaluator = false;
			evaluator = function( $ ) {
				var name = ( typeof $.nodeName == 'string' ? $.nodeName.toLowerCase() : '' );

				return ( typeof query == 'string' ? name == query : name in query );
			};
		}

		while ( $ ) {
			// For user provided checker we use CKEDITOR.dom.node.
			if ( evaluator( isCustomEvaluator ? new CKEDITOR.dom.node( $ ) : $ ) ) {
				return new CKEDITOR.dom.node( $ );
			}

			try {
				$ = $.parentNode;
			} catch ( e ) {
				$ = null;
			}
		}

		return null;
	},

	/**
	 * @todo
	 */
	hasAscendant: function( name, includeSelf ) {
		var $ = this.$;

		if ( !includeSelf )
			$ = $.parentNode;

		while ( $ ) {
			if ( $.nodeName && $.nodeName.toLowerCase() == name )
				return true;

			$ = $.parentNode;
		}
		return false;
	},

	/**
	 * @todo
	 */
	move: function( target, toStart ) {
		target.append( this.remove(), toStart );
	},

	/**
	 * Removes this node from the document DOM.
	 *
	 *		var element = CKEDITOR.document.getById( 'MyElement' );
	 *		element.remove();
	 *
	 * @param {Boolean} [preserveChildren=false] Indicates that the children
	 * elements must remain in the document, removing only the outer tags.
	 */
	remove: function( preserveChildren ) {
		var $ = this.$;
		var parent = $.parentNode;

		if ( parent ) {
			if ( preserveChildren ) {
				// Move all children before the node.
				for ( var child;
				( child = $.firstChild ); ) {
					parent.insertBefore( $.removeChild( child ), $ );
				}
			}

			parent.removeChild( $ );
		}

		return this;
	},

	/**
	 * @todo
	 */
	replace: function( nodeToReplace ) {
		this.insertBefore( nodeToReplace );
		nodeToReplace.remove();
	},

	/**
	 * @todo
	 */
	trim: function() {
		this.ltrim();
		this.rtrim();
	},

	/**
	 * @todo
	 */
	ltrim: function() {
		var child;
		while ( this.getFirst && ( child = this.getFirst() ) ) {
			if ( child.type == CKEDITOR.NODE_TEXT ) {
				var trimmed = CKEDITOR.tools.ltrim( child.getText() ),
					originalLength = child.getLength();

				if ( !trimmed ) {
					child.remove();
					continue;
				} else if ( trimmed.length < originalLength ) {
					child.split( originalLength - trimmed.length );

					// IE BUG: child.remove() may raise JavaScript errors here. (https://dev.ckeditor.com/ticket/81)
					this.$.removeChild( this.$.firstChild );
				}
			}
			break;
		}
	},

	/**
	 * @todo
	 */
	rtrim: function() {
		var child;
		while ( this.getLast && ( child = this.getLast() ) ) {
			if ( child.type == CKEDITOR.NODE_TEXT ) {
				var trimmed = CKEDITOR.tools.rtrim( child.getText() ),
					originalLength = child.getLength();

				if ( !trimmed ) {
					child.remove();
					continue;
				} else if ( trimmed.length < originalLength ) {
					child.split( trimmed.length );

					// IE BUG: child.getNext().remove() may raise JavaScript errors here.
					// (https://dev.ckeditor.com/ticket/81)
					this.$.lastChild.parentNode.removeChild( this.$.lastChild );
				}
			}
			break;
		}

		if ( CKEDITOR.env.needsBrFiller ) {
			child = this.$.lastChild;

			if ( child && child.type == 1 && child.nodeName.toLowerCase() == 'br' ) {
				// Use "eChildNode.parentNode" instead of "node" to avoid IE bug (https://dev.ckeditor.com/ticket/324).
				child.parentNode.removeChild( child );
			}
		}
	},

	/**
	 * Checks if this node is read-only (should not be changed).
	 *
	 *		// For the following HTML:
	 *		// <b>foo</b><div contenteditable="false"><i>bar</i></div>
	 *
	 *		elB.isReadOnly(); // -> false
	 *		foo.isReadOnly(); // -> false
	 *		elDiv.isReadOnly(); // -> true
	 *		elI.isReadOnly(); // -> true
	 *
	 * This method works in two modes depending on browser support for the `element.isContentEditable` property and
	 * the value of the `checkOnlyAttributes` parameter. The `element.isContentEditable` check is faster, but it is known
	 * to malfunction in hidden or detached nodes. Additionally, when processing some detached DOM tree you may want to imitate
	 * that this happens inside an editable container (like it would happen inside the {@link CKEDITOR.editable}). To do so,
	 * you can temporarily attach this tree to an element with the `data-cke-editable` attribute and use the
	 * `checkOnlyAttributes` mode.
	 *
	 * @since 3.5.0
	 * @param {Boolean} [checkOnlyAttributes=false] If `true`, only attributes will be checked, native methods will not
	 * be used. This parameter needs to be `true` to check hidden or detached elements. Introduced in 4.5.0.
	 * @returns {Boolean}
	 */
	isReadOnly: function( checkOnlyAttributes ) {
		var element = this;
		if ( this.type != CKEDITOR.NODE_ELEMENT )
			element = this.getParent();

		// Prevent Edge crash (https://dev.ckeditor.com/ticket/13609, https://dev.ckeditor.com/ticket/13919).
		if ( CKEDITOR.env.edge && element && element.is( 'textarea', 'input' ) ) {
			checkOnlyAttributes = true;
		}

		if ( !checkOnlyAttributes && element && typeof element.$.isContentEditable != 'undefined' ) {
			return !( element.$.isContentEditable || element.data( 'cke-editable' ) );
		}
		else {
			// Degrade for old browsers which don't support "isContentEditable", e.g. FF3

			while ( element ) {
				if ( element.data( 'cke-editable' ) ) {
					return false;
				} else if ( element.hasAttribute( 'contenteditable' ) ) {
					return element.getAttribute( 'contenteditable' ) == 'false';
				}

				element = element.getParent();
			}

			// Reached the root of DOM tree, no editable found.
			return true;
		}
	}
} );

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Defines the {@link CKEDITOR.dom.document} class, which
 *		represents a DOM document.
 */

/**
 * Represents a DOM window.
 *
 *		var document = new CKEDITOR.dom.window( window );
 *
 * @class
 * @extends CKEDITOR.dom.domObject
 * @constructor Creates a window class instance.
 * @param {Object} domWindow A native DOM window.
 */
CKEDITOR.dom.window = function( domWindow ) {
	CKEDITOR.dom.domObject.call( this, domWindow );
};

CKEDITOR.dom.window.prototype = new CKEDITOR.dom.domObject();

CKEDITOR.tools.extend( CKEDITOR.dom.window.prototype, {
	/**
	 * Moves the selection focus to this window.
	 *
	 *		var win = new CKEDITOR.dom.window( window );
	 *		win.focus();
	 */
	focus: function() {
		this.$.focus();
	},

	/**
	 * Gets the width and height of this window's viewable area.
	 *
	 *		var win = new CKEDITOR.dom.window( window );
	 *		var size = win.getViewPaneSize();
	 *		alert( size.width );
	 *		alert( size.height );
	 *
	 * @returns {Object} An object with the `width` and `height`
	 * properties containing the size.
	 */
	getViewPaneSize: function() {
		var doc = this.$.document,
			stdMode = doc.compatMode == 'CSS1Compat';
		return {
			width: ( stdMode ? doc.documentElement.clientWidth : doc.body.clientWidth ) || 0,
			height: ( stdMode ? doc.documentElement.clientHeight : doc.body.clientHeight ) || 0
		};
	},

	/**
	 * Gets the current position of the window's scroll.
	 *
	 *		var win = new CKEDITOR.dom.window( window );
	 *		var pos = win.getScrollPosition();
	 *		alert( pos.x );
	 *		alert( pos.y );
	 *
	 * @returns {Object} An object with the `x` and `y` properties
	 * containing the scroll position.
	 */
	getScrollPosition: function() {
		var $ = this.$;

		if ( 'pageXOffset' in $ ) {
			return {
				x: $.pageXOffset || 0,
				y: $.pageYOffset || 0
			};
		} else {
			var doc = $.document;
			return {
				x: doc.documentElement.scrollLeft || doc.body.scrollLeft || 0,
				y: doc.documentElement.scrollTop || doc.body.scrollTop || 0
			};
		}
	},

	/**
	 * Gets the frame element containing this window context.
	 *
	 * @returns {CKEDITOR.dom.element} The frame element or `null` if not in a frame context.
	 */
	getFrame: function() {
		var iframe = this.$.frameElement;
		return iframe ? new CKEDITOR.dom.element.get( iframe ) : null;
	}
} );

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Defines the {@link CKEDITOR.dom.document} class which
 *		represents a DOM document.
 */

/**
 * Represents a DOM document.
 *
 *		var document = new CKEDITOR.dom.document( document );
 *
 * @class
 * @extends CKEDITOR.dom.domObject
 * @constructor Creates a document class instance.
 * @param {Object} domDocument A native DOM document.
 */
CKEDITOR.dom.document = function( domDocument ) {
	CKEDITOR.dom.domObject.call( this, domDocument );
};

// PACKAGER_RENAME( CKEDITOR.dom.document )

CKEDITOR.dom.document.prototype = new CKEDITOR.dom.domObject();

CKEDITOR.tools.extend( CKEDITOR.dom.document.prototype, {
	/**
	 * The node type. This is a constant value set to {@link CKEDITOR#NODE_DOCUMENT}.
	 *
	 * @readonly
	 * @property {Number} [=CKEDITOR.NODE_DOCUMENT]
	 */
	type: CKEDITOR.NODE_DOCUMENT,

	/**
	 * Appends a CSS file to the document.
	 *
	 *		CKEDITOR.document.appendStyleSheet( '/mystyles.css' );
	 *
	 * @param {String} cssFileUrl The CSS file URL.
	 */
	appendStyleSheet: function( cssFileUrl ) {
		if ( this.$.createStyleSheet )
			this.$.createStyleSheet( cssFileUrl );
		else {
			var link = new CKEDITOR.dom.element( 'link' );
			link.setAttributes( {
				rel: 'stylesheet',
				type: 'text/css',
				href: cssFileUrl
			} );

			this.getHead().append( link );
		}
	},

	/**
	 * Creates a CSS stylesheet and inserts it into the document.
	 *
	 * @param cssStyleText {String} CSS style text.
	 * @returns {Object} The created DOM native stylesheet object.
	 */
	appendStyleText: function( cssStyleText ) {
		if ( this.$.createStyleSheet ) {
			var styleSheet = this.$.createStyleSheet( '' );
			styleSheet.cssText = cssStyleText;
		} else {
			var style = new CKEDITOR.dom.element( 'style', this );
			style.append( new CKEDITOR.dom.text( cssStyleText, this ) );
			this.getHead().append( style );
		}

		return styleSheet || style.$.sheet;
	},

	/**
	 * Creates a {@link CKEDITOR.dom.element} instance in this document.
	 *
	 * @param {String} name The name of the element.
	 * @param {Object} [attributesAndStyles]
	 * @param {Object} [attributesAndStyles.attributes] Attributes that will be set.
	 * @param {Object} [attributesAndStyles.styles] Styles that will be set.
	 * @returns {CKEDITOR.dom.element}
	 */
	createElement: function( name, attribsAndStyles ) {
		var element = new CKEDITOR.dom.element( name, this );

		if ( attribsAndStyles ) {
			if ( attribsAndStyles.attributes )
				element.setAttributes( attribsAndStyles.attributes );

			if ( attribsAndStyles.styles )
				element.setStyles( attribsAndStyles.styles );
		}

		return element;
	},

	/**
	 * Creates a {@link CKEDITOR.dom.text} instance in this document.
	 *
	 * @param {String} text Value of the text node.
	 * @returns {CKEDITOR.dom.element}
	 */
	createText: function( text ) {
		return new CKEDITOR.dom.text( text, this );
	},

	/**
	 * Moves the selection focus to this document's window.
	 */
	focus: function() {
		this.getWindow().focus();
	},

	/**
	 * Returns the element that is currently designated as the active element in the document.
	 *
	 * **Note:** Only one element can be active at a time in a document.
	 * An active element does not necessarily have focus,
	 * but an element with focus is always the active element in a document.
	 *
	 * @returns {CKEDITOR.dom.element} Active element or `null` if an IE8-9 bug is encountered.
	 * See [#10030](https://dev.ckeditor.com/ticket/10030).
	 */
	getActive: function() {
		var $active;
		try {
			$active = this.$.activeElement;
		} catch ( e ) {
			return null;
		}
		return new CKEDITOR.dom.element( $active );
	},

	/**
	 * Gets an element based on its ID.
	 *
	 *		var element = CKEDITOR.document.getById( 'myElement' );
	 *		alert( element.getId() ); // 'myElement'
	 *
	 * @param {String} elementId The element ID.
	 * @returns {CKEDITOR.dom.element} The element instance, or `null` if not found.
	 */
	getById: function( elementId ) {
		var $ = this.$.getElementById( elementId );
		return $ ? new CKEDITOR.dom.element( $ ) : null;
	},

	/**
	 * Gets a node based on its address. See {@link CKEDITOR.dom.node#getAddress}.
	 *
	 * @param {Array} address
	 * @param {Boolean} [normalized=false]
	 */
	getByAddress: function( address, normalized ) {
		var $ = this.$.documentElement;

		for ( var i = 0; $ && i < address.length; i++ ) {
			var target = address[ i ];

			if ( !normalized ) {
				$ = $.childNodes[ target ];
				continue;
			}

			var currentIndex = -1;

			for ( var j = 0; j < $.childNodes.length; j++ ) {
				var candidate = $.childNodes[ j ];

				if ( normalized === true && candidate.nodeType == 3 && candidate.previousSibling && candidate.previousSibling.nodeType == 3 )
					continue;

				currentIndex++;

				if ( currentIndex == target ) {
					$ = candidate;
					break;
				}
			}
		}

		return $ ? new CKEDITOR.dom.node( $ ) : null;
	},

	/**
	 * Gets elements list based on a given tag name.
	 *
	 * @param {String} tagName The element tag name.
	 * @returns {CKEDITOR.dom.nodeList} The nodes list.
	 */
	getElementsByTag: function( tagName, namespace ) {
		if ( !( CKEDITOR.env.ie && ( document.documentMode <= 8 ) ) && namespace )
			tagName = namespace + ':' + tagName;
		return new CKEDITOR.dom.nodeList( this.$.getElementsByTagName( tagName ) );
	},

	/**
	 * Gets the `<head>` element for this document.
	 *
	 *		var element = CKEDITOR.document.getHead();
	 *		alert( element.getName() ); // 'head'
	 *
	 * @returns {CKEDITOR.dom.element} The `<head>` element.
	 */
	getHead: function() {
		var head = this.$.getElementsByTagName( 'head' )[ 0 ];
		if ( !head )
			head = this.getDocumentElement().append( new CKEDITOR.dom.element( 'head' ), true );
		else
			head = new CKEDITOR.dom.element( head );

		return head;
	},

	/**
	 * Gets the `<body>` element for this document.
	 *
	 *		var element = CKEDITOR.document.getBody();
	 *		alert( element.getName() ); // 'body'
	 *
	 * @returns {CKEDITOR.dom.element} The `<body>` element.
	 */
	getBody: function() {
		return new CKEDITOR.dom.element( this.$.body );
	},

	/**
	 * Gets the DOM document element for this document.
	 *
	 * @returns {CKEDITOR.dom.element} The DOM document element.
	 */
	getDocumentElement: function() {
		return new CKEDITOR.dom.element( this.$.documentElement );
	},

	/**
	 * Gets the window object that stores this document.
	 *
	 * @returns {CKEDITOR.dom.window} The window object.
	 */
	getWindow: function() {
		return new CKEDITOR.dom.window( this.$.parentWindow || this.$.defaultView );
	},

	/**
	 * Defines the document content through `document.write`. Note that the
	 * previous document content will be lost (cleaned).
	 *
	 *		document.write(
	 *			'<html>' +
	 *				'<head><title>Sample Document</title></head>' +
	 *				'<body>Document content created by code.</body>' +
	 *			'</html>'
	 *		);
	 *
	 * @since 3.5.0
	 * @param {String} html The HTML defining the document content.
	 */
	write: function( html ) {
		// Don't leave any history log in IE. (https://dev.ckeditor.com/ticket/5657)
		this.$.open( 'text/html', 'replace' );

		// Support for custom document.domain in IE.
		//
		// The script must be appended because if placed before the
		// doctype, IE will go into quirks mode and mess with
		// the editable, e.g. by changing its default height.
		if ( CKEDITOR.env.ie )
			html = html.replace( /(?:^\s*<!DOCTYPE[^>]*?>)|^/i, '$&\n<script data-cke-temp="1">(' + CKEDITOR.tools.fixDomain + ')();</script>' );

		this.$.write( html );
		this.$.close();
	},

	/**
	 * Wrapper for `querySelectorAll`. Returns a list of elements within this document that match
	 * the specified `selector`.
	 *
	 * **Note:** The returned list is not a live collection (like the result of native `querySelectorAll`).
	 *
	 * @since 4.3.0
	 * @param {String} selector A valid [CSS selector](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Selectors).
	 * @returns {CKEDITOR.dom.nodeList}
	 */
	find: function( selector ) {
		return new CKEDITOR.dom.nodeList( this.$.querySelectorAll( selector ) );
	},

	/**
	 * Wrapper for `querySelector`. Returns the first element within this document that matches
	 * the specified `selector`.
	 *
	 * @since 4.3.0
	 * @param {String} selector A valid [CSS selector](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Selectors).
	 * @returns {CKEDITOR.dom.element}
	 */
	findOne: function( selector ) {
		var el = this.$.querySelector( selector );

		return el ? new CKEDITOR.dom.element( el ) : null;
	},

	/**
	 * Internet Explorer 8 only method. It returns a document fragment which has all HTML5 elements enabled.
	 *
	 * @since 4.3.0
	 * @private
	 * @returns DocumentFragment
	 */
	_getHtml5ShivFrag: function() {
		var $frag = this.getCustomData( 'html5ShivFrag' );

		if ( !$frag ) {
			$frag = this.$.createDocumentFragment();
			CKEDITOR.tools.enableHtml5Elements( $frag, true );
			this.setCustomData( 'html5ShivFrag', $frag );
		}

		return $frag;
	}
} );

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * Represents a list of {@link CKEDITOR.dom.node} objects.
 * It is a wrapper for a native nodes list.
 *
 *		var nodeList = CKEDITOR.document.getBody().getChildren();
 *		alert( nodeList.count() ); // number [0;N]
 *
 * @class
 * @constructor Creates a document class instance.
 * @param {Object} nativeList
 */
CKEDITOR.dom.nodeList = function( nativeList ) {
	this.$ = nativeList;
};

CKEDITOR.dom.nodeList.prototype = {
	/**
	 * Gets the count of nodes in this list.
	 *
	 * @returns {Number}
	 */
	count: function() {
		return this.$.length;
	},

	/**
	 * Gets the node from the list.
	 *
	 * @returns {CKEDITOR.dom.node}
	 */
	getItem: function( index ) {
		if ( index < 0 || index >= this.$.length )
			return null;

		var $node = this.$[ index ];
		return $node ? new CKEDITOR.dom.node( $node ) : null;
	},

	/**
	 * Returns a node list as an array.
	 *
	 * @returns {CKEDITOR.dom.node[]}
	 */
	toArray: function() {
		return CKEDITOR.tools.array.map( this.$, function( nativeEl ) {
			return new CKEDITOR.dom.node( nativeEl );
		} );
	}
};

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Defines the {@link CKEDITOR.dom.element} class, which
 *		represents a DOM element.
 */

/**
 * Represents a DOM element.
 *
 *		// Create a new <span> element.
 *		var element = new CKEDITOR.dom.element( 'span' );
 *
 *		// Create an element based on a native DOM element.
 *		var element = new CKEDITOR.dom.element( document.getElementById( 'myId' ) );
 *
 * @class
 * @extends CKEDITOR.dom.node
 * @constructor Creates an element class instance.
 * @param {Object/String} element A native DOM element or the element name for
 * new elements.
 * @param {CKEDITOR.dom.document} [ownerDocument] The document that will contain
 * the element in case of element creation.
 */
CKEDITOR.dom.element = function( element, ownerDocument ) {
	if ( typeof element == 'string' )
		element = ( ownerDocument ? ownerDocument.$ : document ).createElement( element );

	// Call the base constructor (we must not call CKEDITOR.dom.node).
	CKEDITOR.dom.domObject.call( this, element );
};

// PACKAGER_RENAME( CKEDITOR.dom.element )
/**
 * The the {@link CKEDITOR.dom.element} representing and element. If the
 * element is a native DOM element, it will be transformed into a valid
 * CKEDITOR.dom.element object.
 *
 *		var element = new CKEDITOR.dom.element( 'span' );
 *		alert( element == CKEDITOR.dom.element.get( element ) ); // true
 *
 *		var element = document.getElementById( 'myElement' );
 *		alert( CKEDITOR.dom.element.get( element ).getName() ); // (e.g.) 'p'
 *
 * @static
 * @param {String/Object} element Element's id or name or native DOM element.
 * @returns {CKEDITOR.dom.element} The transformed element.
 */
CKEDITOR.dom.element.get = function( element ) {
	var el = typeof element == 'string' ? document.getElementById( element ) || document.getElementsByName( element )[ 0 ] : element;

	return el && ( el.$ ? el : new CKEDITOR.dom.element( el ) );
};

CKEDITOR.dom.element.prototype = new CKEDITOR.dom.node();

/**
 * Creates an instance of the {@link CKEDITOR.dom.element} class based on the
 * HTML representation of an element.
 *
 *		var element = CKEDITOR.dom.element.createFromHtml( '<strong class="anyclass">My element</strong>' );
 *		alert( element.getName() ); // 'strong'
 *
 * @static
 * @param {String} html The element HTML. It should define only one element in
 * the "root" level. The "root" element can have child nodes, but not siblings.
 * @returns {CKEDITOR.dom.element} The element instance.
 */
CKEDITOR.dom.element.createFromHtml = function( html, ownerDocument ) {
	var temp = new CKEDITOR.dom.element( 'div', ownerDocument );
	temp.setHtml( html );

	// When returning the node, remove it from its parent to detach it.
	return temp.getFirst().remove();
};

/**
 * Sets {@link CKEDITOR.dom.element#setCustomData custom data} on an element in a way that it is later
 * possible to {@link #clearAllMarkers clear all data} set on all elements sharing the same database.
 *
 * This mechanism is very useful when processing some portion of DOM. All markers can later be removed
 * by calling the {@link #clearAllMarkers} method, hence markers will not leak to second pass of this algorithm.
 *
 *		var database = {};
 *		CKEDITOR.dom.element.setMarker( database, element1, 'foo', 'bar' );
 *		CKEDITOR.dom.element.setMarker( database, element2, 'oof', [ 1, 2, 3 ] );
 *
 *		element1.getCustomData( 'foo' ); // 'bar'
 *		element2.getCustomData( 'oof' ); // [ 1, 2, 3 ]
 *
 *		CKEDITOR.dom.element.clearAllMarkers( database );
 *
 *		element1.getCustomData( 'foo' ); // null
 *
 * @static
 * @param {Object} database
 * @param {CKEDITOR.dom.element} element
 * @param {String} name
 * @param {Object} value
 * @returns {CKEDITOR.dom.element} The element.
 */
CKEDITOR.dom.element.setMarker = function( database, element, name, value ) {
	var id = element.getCustomData( 'list_marker_id' ) || ( element.setCustomData( 'list_marker_id', CKEDITOR.tools.getNextNumber() ).getCustomData( 'list_marker_id' ) ),
		markerNames = element.getCustomData( 'list_marker_names' ) || ( element.setCustomData( 'list_marker_names', {} ).getCustomData( 'list_marker_names' ) );
	database[ id ] = element;
	markerNames[ name ] = 1;

	return element.setCustomData( name, value );
};

/**
 * Removes all markers added using this database. See the {@link #setMarker} method for more information.
 *
 * @param {Object} database
 * @static
 */
CKEDITOR.dom.element.clearAllMarkers = function( database ) {
	for ( var i in database )
		CKEDITOR.dom.element.clearMarkers( database, database[ i ], 1 );
};

/**
 * Removes all markers added to this element and removes it from the database if
 * `removeFromDatabase` was passed. See the {@link #setMarker} method for more information.
 *
 *		var database = {};
 *		CKEDITOR.dom.element.setMarker( database, element1, 'foo', 'bar' );
 *		CKEDITOR.dom.element.setMarker( database, element2, 'oof', [ 1, 2, 3 ] );
 *
 *		element1.getCustomData( 'foo' ); // 'bar'
 *		element2.getCustomData( 'oof' ); // [ 1, 2, 3 ]
 *
 *		CKEDITOR.dom.element.clearMarkers( database, element1, true );
 *
 *		element1.getCustomData( 'foo' ); // null
 *		element2.getCustomData( 'oof' ); // [ 1, 2, 3 ]
 *
 * @param {Object} database
 * @static
 */
CKEDITOR.dom.element.clearMarkers = function( database, element, removeFromDatabase ) {
	var names = element.getCustomData( 'list_marker_names' ),
		id = element.getCustomData( 'list_marker_id' );
	for ( var i in names )
		element.removeCustomData( i );
	element.removeCustomData( 'list_marker_names' );
	if ( removeFromDatabase ) {
		element.removeCustomData( 'list_marker_id' );
		delete database[ id ];
	}
};

( function() {
	var elementsClassList = document.createElement( '_' ).classList,
		supportsClassLists = typeof elementsClassList !== 'undefined' && String( elementsClassList.add ).match( /\[Native code\]/gi ) !== null,
		rclass = /[\n\t\r]/g;

	function hasClass( classNames, className ) {
		// Source: jQuery.
		return ( ' ' + classNames + ' ' ).replace( rclass, ' ' ).indexOf( ' ' + className + ' ' ) > -1;
	}

	CKEDITOR.tools.extend( CKEDITOR.dom.element.prototype, {
		/**
		 * The node type. This is a constant value set to {@link CKEDITOR#NODE_ELEMENT}.
		 *
		 * @readonly
		 * @property {Number} [=CKEDITOR.NODE_ELEMENT]
		 */
		type: CKEDITOR.NODE_ELEMENT,

		/**
		 * Adds a CSS class to the element. It appends the class to the
		 * already existing names.
		 *
		 *		var element = new CKEDITOR.dom.element( 'div' );
		 *		element.addClass( 'classA' ); // <div class="classA">
		 *		element.addClass( 'classB' ); // <div class="classA classB">
		 *		element.addClass( 'classA' ); // <div class="classA classB">
		 *
		 * **Note:** Since CKEditor 4.5.0 this method cannot be used with multiple classes (`'classA classB'`).
		 *
		 * @chainable
		 * @method addClass
		 * @param {String} className The name of the class to be added.
		 */
		addClass: supportsClassLists ?
			function( className ) {
				this.$.classList.add( className );

				return this;
			} : function( className ) {
				var c = this.$.className;
				if ( c ) {
					if ( !hasClass( c, className ) )
						c += ' ' + className;
				}
				this.$.className = c || className;

				return this;
			},

		/**
		 * Removes a CSS class name from the elements classes. Other classes
		 * remain untouched.
		 *
		 *		var element = new CKEDITOR.dom.element( 'div' );
		 *		element.addClass( 'classA' );		// <div class="classA">
		 *		element.addClass( 'classB' );		// <div class="classA classB">
		 *		element.removeClass( 'classA' );	// <div class="classB">
		 *		element.removeClass( 'classB' );	// <div>
		 *
		 * @chainable
		 * @method removeClass
		 * @param {String} className The name of the class to remove.
		 */
		removeClass: supportsClassLists ?
			function( className ) {
				var $ = this.$;
				$.classList.remove( className );

				if ( !$.className )
					$.removeAttribute( 'class' );

				return this;
			} : function( className ) {
				var c = this.getAttribute( 'class' );
				if ( c && hasClass( c, className ) ) {
					c = c
						.replace( new RegExp( '(?:^|\\s+)' + className + '(?=\\s|$)' ), '' )
						.replace( /^\s+/, '' );

					if ( c )
						this.setAttribute( 'class', c );
					else
						this.removeAttribute( 'class' );
				}

				return this;
			},

		/**
		 * Checks if element has class name.
		 *
		 * @param {String} className
		 * @returns {Boolean}
		 */
		hasClass: function( className ) {
			return hasClass( this.$.className, className );
		},

		/**
		 * Append a node as a child of this element.
		 *
		 *		var p = new CKEDITOR.dom.element( 'p' );
		 *
		 *		var strong = new CKEDITOR.dom.element( 'strong' );
		 *		p.append( strong );
		 *
		 *		var em = p.append( 'em' );
		 *
		 *		// Result: '<p><strong></strong><em></em></p>'
		 *
		 * @param {CKEDITOR.dom.node/String} node The node or element name to be appended.
		 * @param {Boolean} [toStart=false] Indicates that the element is to be appended at the start.
		 * @returns {CKEDITOR.dom.node} The appended node.
		 */
		append: function( node, toStart ) {
			if ( typeof node == 'string' )
				node = this.getDocument().createElement( node );

			if ( toStart )
				this.$.insertBefore( node.$, this.$.firstChild );
			else
				this.$.appendChild( node.$ );

			return node;
		},

		/**
		 * Append HTML as a child(ren) of this element.
		 *
		 * @param {String} html
		 */
		appendHtml: function( html ) {
			if ( !this.$.childNodes.length )
				this.setHtml( html );
			else {
				var temp = new CKEDITOR.dom.element( 'div', this.getDocument() );
				temp.setHtml( html );
				temp.moveChildren( this );
			}
		},

		/**
		 * Append text to this element.
		 *
		 *		var p = new CKEDITOR.dom.element( 'p' );
		 *		p.appendText( 'This is' );
		 *		p.appendText( ' some text' );
		 *
		 *		// Result: '<p>This is some text</p>'
		 *
		 * @param {String} text The text to be appended.
		 */
		appendText: function( text ) {
			// On IE8 it is impossible to append node to script tag, so we use its text.
			// On the contrary, on Safari the text property is unpredictable in links. (https://dev.ckeditor.com/ticket/13232)
			if ( this.$.text != null && CKEDITOR.env.ie && CKEDITOR.env.version < 9 )
				this.$.text += text;
			else
				this.append( new CKEDITOR.dom.text( text ) );
		},

		/**
		 * Appends a `<br>` filler element to this element if the filler is not present already.
		 * By default filler is appended only if {@link CKEDITOR.env#needsBrFiller} is `true`,
		 * however when `force` is set to `true` filler will be appended regardless of the environment.
		 *
		 * @param {Boolean} [force] Append filler regardless of the environment.
		 */
		appendBogus: function( force ) {
			if ( !force && !CKEDITOR.env.needsBrFiller )
				return;

			var lastChild = this.getLast();

			// Ignore empty/spaces text.
			while ( lastChild && lastChild.type == CKEDITOR.NODE_TEXT && !CKEDITOR.tools.rtrim( lastChild.getText() ) )
				lastChild = lastChild.getPrevious();
			if ( !lastChild || !lastChild.is || !lastChild.is( 'br' ) ) {
				var bogus = this.getDocument().createElement( 'br' );

				CKEDITOR.env.gecko && bogus.setAttribute( 'type', '_moz' );

				this.append( bogus );
			}
		},

		/**
		 * Breaks one of the ancestor element in the element position, moving
		 * this element between the broken parts.
		 *
		 *		// Before breaking:
		 *		//		<b>This <i>is some<span /> sample</i> test text</b>
		 *		// If "element" is <span /> and "parent" is <i>:
		 *		//		<b>This <i>is some</i><span /><i> sample</i> test text</b>
		 *		element.breakParent( parent );
		 *
		 *		// Before breaking:
		 *		//		<b>This <i>is some<span /> sample</i> test text</b>
		 *		// If "element" is <span /> and "parent" is <b>:
		 *		//		<b>This <i>is some</i></b><span /><b><i> sample</i> test text</b>
		 *		element.breakParent( parent );
		 *
		 * @param {CKEDITOR.dom.element} parent The anscestor element to get broken.
		 * @param {Boolean} [cloneId=false] Whether to preserve ancestor ID attributes while breaking.
		 */
		breakParent: function( parent, cloneId ) {
			var range = new CKEDITOR.dom.range( this.getDocument() );

			// We'll be extracting part of this element, so let's use our
			// range to get the correct piece.
			range.setStartAfter( this );
			range.setEndAfter( parent );

			// Extract it.
			var docFrag = range.extractContents( false, cloneId || false ),
				tmpElement,
				current;

			// Move the element outside the broken element.
			range.insertNode( this.remove() );

			// In case of Internet Explorer, we must check if there is no background-color
			// added to the element. In such case, we have to overwrite it to prevent "switching it off"
			// by a browser (https://dev.ckeditor.com/ticket/14667).
			if ( CKEDITOR.env.ie && !CKEDITOR.env.edge ) {
				tmpElement = new CKEDITOR.dom.element( 'div' );

				while ( current = docFrag.getFirst() ) {
					if ( current.$.style.backgroundColor ) {
						// This is a necessary hack to make sure that IE will track backgroundColor CSS property, see
						// https://dev.ckeditor.com/ticket/14667#comment:8 for more details.
						current.$.style.backgroundColor = current.$.style.backgroundColor;
					}

					tmpElement.append( current );
				}

				// Re-insert the extracted piece after the element.
				tmpElement.insertAfter( this );
				tmpElement.remove( true );
			} else {
				// Re-insert the extracted piece after the element.
				docFrag.insertAfterNode( this );
			}
		},

		/**
		 * Checks if this element contains given node.
		 *
		 * @method
		 * @param {CKEDITOR.dom.node} node
		 * @returns {Boolean}
		 */
		contains: !document.compareDocumentPosition ?
			function( node ) {
				var $ = this.$;

				return node.type != CKEDITOR.NODE_ELEMENT ? $.contains( node.getParent().$ ) : $ != node.$ && $.contains( node.$ );
			} : function( node ) {
				return !!( this.$.compareDocumentPosition( node.$ ) & 16 );
			},

		/**
		 * Moves the selection focus to this element.
		 *
		 *		var element = CKEDITOR.document.getById( 'myTextarea' );
		 *		element.focus();
		 *
		 * @method
		 * @param  {Boolean} defer Whether to asynchronously defer the
		 * execution by 100 ms.
		 */
		focus: ( function() {
			function exec() {
				// IE throws error if the element is not visible.
				try {
					this.$.focus();
				} catch ( e ) {}
			}

			return function( defer ) {
				if ( defer )
					CKEDITOR.tools.setTimeout( exec, 100, this );
				else
					exec.call( this );
			};
		} )(),

		/**
		 * Gets the inner HTML of this element.
		 *
		 *		var element = CKEDITOR.dom.element.createFromHtml( '<div><b>Example</b></div>' );
		 *		alert( element.getHtml() ); // '<b>Example</b>'
		 *
		 * @returns {String} The inner HTML of this element.
		 */
		getHtml: function() {
			var retval = this.$.innerHTML;
			// Strip <?xml:namespace> tags in IE. (https://dev.ckeditor.com/ticket/3341).
			return CKEDITOR.env.ie ? retval.replace( /<\?[^>]*>/g, '' ) : retval;
		},

		/**
		 * Gets the outer (inner plus tags) HTML of this element.
		 *
		 *		var element = CKEDITOR.dom.element.createFromHtml( '<div class="bold"><b>Example</b></div>' );
		 *		alert( element.getOuterHtml() ); // '<div class="bold"><b>Example</b></div>'
		 *
		 * @returns {String} The outer HTML of this element.
		 */
		getOuterHtml: function() {
			if ( this.$.outerHTML ) {
				// IE includes the <?xml:namespace> tag in the outerHTML of
				// namespaced element. So, we must strip it here. (https://dev.ckeditor.com/ticket/3341)
				return this.$.outerHTML.replace( /<\?[^>]*>/, '' );
			}

			var tmpDiv = this.$.ownerDocument.createElement( 'div' );
			tmpDiv.appendChild( this.$.cloneNode( true ) );
			return tmpDiv.innerHTML;
		},

		/**
		 * Retrieve the bounding rectangle of the current element, in pixels,
		 * relative to the upper-left corner of the browser's client area.
		 *
		 * Since 4.10.0 you can pass an additional parameter if the function should return an absolute element position that can be used for
		 * positioning elements inside scrollable areas.
		 *
		 * For example, you can use this function with the {@link CKEDITOR.dom.window#getFrame editor's window frame} to
		 * calculate the absolute rectangle of the visible area of the editor viewport.
		 * The retrieved absolute rectangle can be used to position elements like toolbars or notifications (elements outside the editor)
		 * to always keep them inside the editor viewport independently from the scroll position.
		 *
		 * ```javascript
		 * var frame = editor.window.getFrame();
		 * frame.getClientRect( true );
		 * ```
		 *
		 * @param {Boolean} [isAbsolute=false] The function will retrieve an absolute rectangle of the element, i.e. the position relative
		 * to the upper-left corner of the topmost viewport. This option is available since 4.10.0.
		 * @returns {CKEDITOR.dom.rect} The dimensions of the DOM element.
		 */
		getClientRect: function( isAbsolute ) {
			// http://help.dottoro.com/ljvmcrrn.php
			var elementRect = CKEDITOR.tools.extend( {}, this.$.getBoundingClientRect() );

			!elementRect.width && ( elementRect.width = elementRect.right - elementRect.left );
			!elementRect.height && ( elementRect.height = elementRect.bottom - elementRect.top );

			if ( !isAbsolute ) {
				return elementRect;
			}

			return CKEDITOR.tools.getAbsoluteRectPosition( this.getWindow(), elementRect );
		},

		/**
		 * Sets the inner HTML of this element.
		 *
		 *		var p = new CKEDITOR.dom.element( 'p' );
		 *		p.setHtml( '<b>Inner</b> HTML' );
		 *
		 *		// Result: '<p><b>Inner</b> HTML</p>'
		 *
		 * @method
		 * @param {String} html The HTML to be set for this element.
		 * @returns {String} The inserted HTML.
		 */
		setHtml: ( CKEDITOR.env.ie && CKEDITOR.env.version < 9 ) ?
			// old IEs throws error on HTML manipulation (through the "innerHTML" property)
			// on the element which resides in an DTD invalid position,  e.g. <span><div></div></span>
			// fortunately it can be worked around with DOM manipulation.
			function( html ) {
				try {
					var $ = this.$;

					// Fix the case when setHtml is called on detached element.
					// HTML5 shiv used for document in which this element was created
					// won't affect that detached element. So get document fragment with
					// all HTML5 elements enabled and set innerHTML while this element is appended to it.
					if ( this.getParent() )
						return ( $.innerHTML = html );
					else {
						var $frag = this.getDocument()._getHtml5ShivFrag();
						$frag.appendChild( $ );
						$.innerHTML = html;
						$frag.removeChild( $ );

						return html;
					}
				}
				catch ( e ) {
					this.$.innerHTML = '';

					var temp = new CKEDITOR.dom.element( 'body', this.getDocument() );
					temp.$.innerHTML = html;

					var children = temp.getChildren();
					while ( children.count() )
						this.append( children.getItem( 0 ) );

					return html;
				}
			} : function( html ) {
				return ( this.$.innerHTML = html );
			},

		/**
		 * Sets the element contents as plain text.
		 *
		 *		var element = new CKEDITOR.dom.element( 'div' );
		 *		element.setText( 'A > B & C < D' );
		 *		alert( element.innerHTML ); // 'A &gt; B &amp; C &lt; D'
		 *
		 * @param {String} text The text to be set.
		 * @returns {String} The inserted text.
		 */
		setText: ( function() {
			var supportsTextContent = document.createElement( 'p' );
			supportsTextContent.innerHTML = 'x';
			supportsTextContent = supportsTextContent.textContent;

			return function( text ) {
				this.$[ supportsTextContent ? 'textContent' : 'innerText' ] = text;
			};
		} )(),

		/**
		 * Gets the value of an element attribute.
		 *
		 *		var element = CKEDITOR.dom.element.createFromHtml( '<input type="text" />' );
		 *		alert( element.getAttribute( 'type' ) ); // 'text'
		 *
		 * @method
		 * @param {String} name The attribute name.
		 * @returns {String} The attribute value or null if not defined.
		 */
		getAttribute: ( function() {
			var standard = function( name ) {
					return this.$.getAttribute( name, 2 );
				};

			if ( CKEDITOR.env.ie && ( CKEDITOR.env.ie7Compat || CKEDITOR.env.quirks ) ) {
				return function( name ) {
					switch ( name ) {
						case 'class':
							name = 'className';
							break;

						case 'http-equiv':
							name = 'httpEquiv';
							break;

						case 'name':
							return this.$.name;

						case 'tabindex':
							var tabIndex = standard.call( this, name );

							// IE returns tabIndex=0 by default for all
							// elements. For those elements,
							// getAtrribute( 'tabindex', 2 ) returns 32768
							// instead. So, we must make this check to give a
							// uniform result among all browsers.
							if ( tabIndex !== 0 && this.$.tabIndex === 0 )
								tabIndex = null;

							return tabIndex;

						case 'checked':
							var attr = this.$.attributes.getNamedItem( name ),
								attrValue = attr.specified ? attr.nodeValue // For value given by parser.
								: this.$.checked; // For value created via DOM interface.

							return attrValue ? 'checked' : null;

						case 'hspace':
						case 'value':
							return this.$[ name ];

						case 'style':
							// IE does not return inline styles via getAttribute(). See https://dev.ckeditor.com/ticket/2947.
							return this.$.style.cssText;

						case 'contenteditable':
						case 'contentEditable':
							return this.$.attributes.getNamedItem( 'contentEditable' ).specified ? this.$.getAttribute( 'contentEditable' ) : null;
					}

					return standard.call( this, name );
				};
			} else {
				return standard;
			}
		} )(),

		/**
		 * Gets the values of all element attributes.
		 *
		 * @param {Array} exclude The names of attributes to be excluded from the returned object.
		 * @return {Object} An object containing all element attributes with their values.
		 */
		getAttributes: function( exclude ) {
			var attributes = {},
				attrDefs = this.$.attributes,
				i;

			exclude = CKEDITOR.tools.isArray( exclude ) ? exclude : [];

			for ( i = 0; i < attrDefs.length; i++ ) {
				if ( CKEDITOR.tools.indexOf( exclude, attrDefs[ i ].name ) === -1 ) {
					attributes[ attrDefs[ i ].name ] = attrDefs[ i ].value;
				}
			}

			return attributes;
		},

		/**
		 * Gets the nodes list containing all children of this element.
		 *
		 * @returns {CKEDITOR.dom.nodeList}
		 */
		getChildren: function() {
			return new CKEDITOR.dom.nodeList( this.$.childNodes );
		},

		/**
		 * Gets the current computed value of one of the element CSS style
		 * properties.
		 *
		 *		var element = new CKEDITOR.dom.element( 'span' );
		 *		alert( element.getComputedStyle( 'display' ) ); // 'inline'
		 *
		 * @method
		 * @param {String} propertyName The style property name.
		 * @returns {String} The property value.
		 */
		getComputedStyle: ( document.defaultView && document.defaultView.getComputedStyle ) ?
				function( propertyName ) {
					var style = this.getWindow().$.getComputedStyle( this.$, null );

					// Firefox may return null if we call the above on a hidden iframe. (https://dev.ckeditor.com/ticket/9117)
					return style ? style.getPropertyValue( propertyName ) : '';
				} : function( propertyName ) {
					return this.$.currentStyle[ CKEDITOR.tools.cssStyleToDomStyle( propertyName ) ];
				},

		/**
		 * Gets the DTD entries for this element.
		 *
		 * @returns {Object} An object containing the list of elements accepted
		 * by this element.
		 */
		getDtd: function() {
			var dtd = CKEDITOR.dtd[ this.getName() ];

			this.getDtd = function() {
				return dtd;
			};

			return dtd;
		},

		/**
		 * Gets all this element's descendants having given tag name.
		 *
		 * @method
		 * @param {String} tagName
		 */
		getElementsByTag: CKEDITOR.dom.document.prototype.getElementsByTag,

		/**
		 * Gets the computed tabindex for this element.
		 *
		 *		var element = CKEDITOR.document.getById( 'myDiv' );
		 *		alert( element.getTabIndex() ); // (e.g.) '-1'
		 *
		 * @method
		 * @returns {Number} The tabindex value.
		 */
		getTabIndex: function() {
			var tabIndex = this.$.tabIndex;

			// IE returns tabIndex=0 by default for all elements. In
			// those cases we must check that the element really has
			// the tabindex attribute set to zero, or it is one of
			// those element that should have zero by default.
			if ( tabIndex === 0 && !CKEDITOR.dtd.$tabIndex[ this.getName() ] && parseInt( this.getAttribute( 'tabindex' ), 10 ) !== 0 )
				return -1;

			return tabIndex;
		},

		/**
		 * Gets the text value of this element.
		 *
		 * Only in IE (which uses innerText), `<br>` will cause linebreaks,
		 * and sucessive whitespaces (including line breaks) will be reduced to
		 * a single space. This behavior is ok for us, for now. It may change
		 * in the future.
		 *
		 *		var element = CKEDITOR.dom.element.createFromHtml( '<div>Sample <i>text</i>.</div>' );
		 *		alert( <b>element.getText()</b> ); // 'Sample text.'
		 *
		 * @returns {String} The text value.
		 */
		getText: function() {
			return this.$.textContent || this.$.innerText || '';
		},

		/**
		 * Gets the window object that contains this element.
		 *
		 * @returns {CKEDITOR.dom.window} The window object.
		 */
		getWindow: function() {
			return this.getDocument().getWindow();
		},

		/**
		 * Gets the value of the `id` attribute of this element.
		 *
		 *		var element = CKEDITOR.dom.element.createFromHtml( '<p id="myId"></p>' );
		 *		alert( element.getId() ); // 'myId'
		 *
		 * @returns {String} The element id, or null if not available.
		 */
		getId: function() {
			return this.$.id || null;
		},

		/**
		 * Gets the value of the `name` attribute of this element.
		 *
		 *		var element = CKEDITOR.dom.element.createFromHtml( '<input name="myName"></input>' );
		 *		alert( <b>element.getNameAtt()</b> ); // 'myName'
		 *
		 * @returns {String} The element name, or null if not available.
		 */
		getNameAtt: function() {
			return this.$.name || null;
		},

		/**
		 * Gets the element name (tag name). The returned name is guaranteed to
		 * be always full lowercased.
		 *
		 *		var element = new CKEDITOR.dom.element( 'span' );
		 *		alert( element.getName() ); // 'span'
		 *
		 * @returns {String} The element name.
		 */
		getName: function() {
			// Cache the lowercased name inside a closure.
			var nodeName = this.$.nodeName.toLowerCase();

			if ( CKEDITOR.env.ie && ( document.documentMode <= 8 ) ) {
				var scopeName = this.$.scopeName;
				if ( scopeName != 'HTML' )
					nodeName = scopeName.toLowerCase() + ':' + nodeName;
			}

			this.getName = function() {
				return nodeName;
			};

			return this.getName();
		},

		/**
		 * Gets the value set to this element. This value is usually available
		 * for form field elements.
		 *
		 * @returns {String} The element value.
		 */
		getValue: function() {
			return this.$.value;
		},

		/**
		 * Gets the first child node of this element.
		 *
		 *		var element = CKEDITOR.dom.element.createFromHtml( '<div><b>Example</b></div>' );
		 *		var first = element.getFirst();
		 *		alert( first.getName() ); // 'b'
		 *
		 * @param {Function} evaluator Filtering the result node.
		 * @returns {CKEDITOR.dom.node} The first child node or null if not available.
		 */
		getFirst: function( evaluator ) {
			var first = this.$.firstChild,
				retval = first && new CKEDITOR.dom.node( first );
			if ( retval && evaluator && !evaluator( retval ) )
				retval = retval.getNext( evaluator );

			return retval;
		},

		/**
		 * See {@link #getFirst}.
		 *
		 * @param {Function} evaluator Filtering the result node.
		 * @returns {CKEDITOR.dom.node}
		 */
		getLast: function( evaluator ) {
			var last = this.$.lastChild,
				retval = last && new CKEDITOR.dom.node( last );
			if ( retval && evaluator && !evaluator( retval ) )
				retval = retval.getPrevious( evaluator );

			return retval;
		},

		/**
		 * Gets CSS style value.
		 *
		 * @param {String} name The CSS property name.
		 * @returns {String} Style value.
		 */
		getStyle: function( name ) {
			return this.$.style[ CKEDITOR.tools.cssStyleToDomStyle( name ) ];
		},

		/**
		 * Checks if the element name matches the specified criteria.
		 *
		 *		var element = new CKEDITOR.element( 'span' );
		 *		alert( element.is( 'span' ) );			// true
		 *		alert( element.is( 'p', 'span' ) );		// true
		 *		alert( element.is( 'p' ) );				// false
		 *		alert( element.is( 'p', 'div' ) );		// false
		 *		alert( element.is( { p:1,span:1 } ) );	// true
		 *
		 * @param {String.../Object} name One or more names to be checked, or a {@link CKEDITOR.dtd} object.
		 * @returns {Boolean} `true` if the element name matches any of the names.
		 */
		is: function() {
			var name = this.getName();

			// Check against the specified DTD liternal.
			if ( typeof arguments[ 0 ] == 'object' )
				return !!arguments[ 0 ][ name ];

			// Check for tag names
			for ( var i = 0; i < arguments.length; i++ ) {
				if ( arguments[ i ] == name )
					return true;
			}
			return false;
		},

		/**
		 * Decide whether one element is able to receive cursor.
		 *
		 * @param {Boolean} [textCursor=true] Only consider element that could receive text child.
		 */
		isEditable: function( textCursor ) {
			var name = this.getName();

			if ( this.isReadOnly() || this.getComputedStyle( 'display' ) == 'none' ||
				this.getComputedStyle( 'visibility' ) == 'hidden' ||
				CKEDITOR.dtd.$nonEditable[ name ] ||
				CKEDITOR.dtd.$empty[ name ] ||
				( this.is( 'a' ) &&
					( this.data( 'cke-saved-name' ) || this.hasAttribute( 'name' ) ) &&
					!this.getChildCount()
				) ) {
				return false;
			}

			if ( textCursor !== false ) {
				// Get the element DTD (defaults to span for unknown elements).
				var dtd = CKEDITOR.dtd[ name ] || CKEDITOR.dtd.span;
				// In the DTD # == text node.
				return !!( dtd && dtd[ '#' ] );
			}

			return true;
		},

		/**
		 * Compare this element's inner html, tag name, attributes, etc. with other one.
		 *
		 * See [W3C's DOM Level 3 spec - node#isEqualNode](http://www.w3.org/TR/DOM-Level-3-Core/core.html#Node3-isEqualNode)
		 * for more details.
		 *
		 * @param {CKEDITOR.dom.element} otherElement Element to compare.
		 * @returns {Boolean}
		 */
		isIdentical: function( otherElement ) {
			// do shallow clones, but with IDs
			var thisEl = this.clone( 0, 1 ),
				otherEl = otherElement.clone( 0, 1 );

			// Remove distractions.
			thisEl.removeAttributes( [ '_moz_dirty', 'data-cke-expando', 'data-cke-saved-href', 'data-cke-saved-name' ] );
			otherEl.removeAttributes( [ '_moz_dirty', 'data-cke-expando', 'data-cke-saved-href', 'data-cke-saved-name' ] );

			// Native comparison available.
			if ( thisEl.$.isEqualNode ) {
				// Styles order matters.
				thisEl.$.style.cssText = CKEDITOR.tools.normalizeCssText( thisEl.$.style.cssText );
				otherEl.$.style.cssText = CKEDITOR.tools.normalizeCssText( otherEl.$.style.cssText );
				return thisEl.$.isEqualNode( otherEl.$ );
			} else {
				thisEl = thisEl.getOuterHtml();
				otherEl = otherEl.getOuterHtml();

				// Fix tiny difference between link href in older IEs.
				if ( CKEDITOR.env.ie && CKEDITOR.env.version < 9 && this.is( 'a' ) ) {
					var parent = this.getParent();
					if ( parent.type == CKEDITOR.NODE_ELEMENT ) {
						var el = parent.clone();
						el.setHtml( thisEl ), thisEl = el.getHtml();
						el.setHtml( otherEl ), otherEl = el.getHtml();
					}
				}

				return thisEl == otherEl;
			}
		},

		/**
		 * Checks if this element is visible. May not work if the element is
		 * child of an element with visibility set to `hidden`, but works well
		 * on the great majority of cases.
		 *
		 * @returns {Boolean} True if the element is visible.
		 */
		isVisible: function() {
			var isVisible = ( this.$.offsetHeight || this.$.offsetWidth ) && this.getComputedStyle( 'visibility' ) != 'hidden',
				elementWindow, elementWindowFrame;

			// Webkit and Opera report non-zero offsetHeight despite that
			// element is inside an invisible iframe. (https://dev.ckeditor.com/ticket/4542)
			if ( isVisible && CKEDITOR.env.webkit ) {
				elementWindow = this.getWindow();

				if ( !elementWindow.equals( CKEDITOR.document.getWindow() ) && ( elementWindowFrame = elementWindow.$.frameElement ) )
					isVisible = new CKEDITOR.dom.element( elementWindowFrame ).isVisible();

			}

			return !!isVisible;
		},

		/**
		 * Whether it's an empty inline elements which has no visual impact when removed.
		 *
		 * @returns {Boolean}
		 */
		isEmptyInlineRemoveable: function() {
			if ( !CKEDITOR.dtd.$removeEmpty[ this.getName() ] )
				return false;

			var children = this.getChildren();
			for ( var i = 0, count = children.count(); i < count; i++ ) {
				var child = children.getItem( i );

				if ( child.type == CKEDITOR.NODE_ELEMENT && child.data( 'cke-bookmark' ) )
					continue;

				if ( child.type == CKEDITOR.NODE_ELEMENT && !child.isEmptyInlineRemoveable() || child.type == CKEDITOR.NODE_TEXT && CKEDITOR.tools.trim( child.getText() ) )
					return false;

			}
			return true;
		},

		/**
		 * Checks if the element has any defined attributes.
		 *
		 *		var element = CKEDITOR.dom.element.createFromHtml( '<div title="Test">Example</div>' );
		 *		alert( element.hasAttributes() ); // true
		 *
		 *		var element = CKEDITOR.dom.element.createFromHtml( '<div>Example</div>' );
		 *		alert( element.hasAttributes() ); // false
		 *
		 * @method
		 * @returns {Boolean} True if the element has attributes.
		 */
		hasAttributes: CKEDITOR.env.ie && ( CKEDITOR.env.ie7Compat || CKEDITOR.env.quirks ) ?
			function() {
				var attributes = this.$.attributes;

				for ( var i = 0; i < attributes.length; i++ ) {
					var attribute = attributes[ i ];

					switch ( attribute.nodeName ) {
						case 'class':
							// IE has a strange bug. If calling removeAttribute('className'),
							// the attributes collection will still contain the "class"
							// attribute, which will be marked as "specified", even if the
							// outerHTML of the element is not displaying the class attribute.
							// Note : I was not able to reproduce it outside the editor,
							// but I've faced it while working on the TC of https://dev.ckeditor.com/ticket/1391.
							if ( this.getAttribute( 'class' ) ) {
								return true;
							}

						// Attributes to be ignored.
						/* falls through */
						case 'data-cke-expando':
							continue;


						/* falls through */
						default:
							if ( attribute.specified ) {
								return true;
							}
					}
				}

				return false;
			} : function() {
				var attrs = this.$.attributes,
					attrsNum = attrs.length;

				// The _moz_dirty attribute might get into the element after pasting (https://dev.ckeditor.com/ticket/5455)
				var execludeAttrs = { 'data-cke-expando': 1, _moz_dirty: 1 };

				return attrsNum > 0 && ( attrsNum > 2 || !execludeAttrs[ attrs[ 0 ].nodeName ] || ( attrsNum == 2 && !execludeAttrs[ attrs[ 1 ].nodeName ] ) );
			},

		/**
		 * Checks if the specified attribute is defined for this element.
		 *
		 * @method
		 * @param {String} name The attribute name.
		 * @returns {Boolean} `true` if the specified attribute is defined.
		 */
		hasAttribute: ( function() {
			function ieHasAttribute( name ) {
				var $attr = this.$.attributes.getNamedItem( name );

				if ( this.getName() == 'input' ) {
					switch ( name ) {
						case 'class':
							return this.$.className.length > 0;
						case 'checked':
							return !!this.$.checked;
						case 'value':
							var type = this.getAttribute( 'type' );
							return type == 'checkbox' || type == 'radio' ? this.$.value != 'on' : !!this.$.value;
					}
				}

				if ( !$attr )
					return false;

				return $attr.specified;
			}

			if ( CKEDITOR.env.ie ) {
				if ( CKEDITOR.env.version < 8 ) {
					return function( name ) {
						// On IE < 8 the name attribute cannot be retrieved
						// right after the element creation and setting the
						// name with setAttribute.
						if ( name == 'name' )
							return !!this.$.name;

						return ieHasAttribute.call( this, name );
					};
				} else {
					return ieHasAttribute;
				}
			} else {
				return function( name ) {
					// On other browsers specified property is deprecated and return always true,
					// but fortunately $.attributes contains only specified attributes.
					return !!this.$.attributes.getNamedItem( name );
				};
			}
		} )(),

		/**
		 * Hides this element (sets `display: none`).
		 *
		 *		var element = CKEDITOR.document.getById( 'myElement' );
		 *		element.hide();
		 */
		hide: function() {
			this.setStyle( 'display', 'none' );
		},

		/**
		 * Moves this element's children to the target element.
		 *
		 * @param {CKEDITOR.dom.element} target
		 * @param {Boolean} [toStart=false] Insert moved children at the
		 * beginning of the target element.
		 */
		moveChildren: function( target, toStart ) {
			var $ = this.$;
			target = target.$;

			if ( $ == target )
				return;

			var child;

			if ( toStart ) {
				while ( ( child = $.lastChild ) )
					target.insertBefore( $.removeChild( child ), target.firstChild );
			} else {
				while ( ( child = $.firstChild ) )
					target.appendChild( $.removeChild( child ) );
			}
		},

		/**
		 * Merges sibling elements that are identical to this one.
		 *
		 * Identical child elements are also merged. For example:
		 *
		 *		<b><i></i></b><b><i></i></b> => <b><i></i></b>
		 *
		 * @method
		 * @param {Boolean} [inlineOnly=true] Allow only inline elements to be merged.
		 */
		mergeSiblings: ( function() {
			function mergeElements( element, sibling, isNext ) {
				if ( sibling && sibling.type == CKEDITOR.NODE_ELEMENT ) {
					// Jumping over bookmark nodes and empty inline elements, e.g. <b><i></i></b>,
					// queuing them to be moved later. (https://dev.ckeditor.com/ticket/5567)
					var pendingNodes = [];

					while ( sibling.data( 'cke-bookmark' ) || sibling.isEmptyInlineRemoveable() ) {
						pendingNodes.push( sibling );
						sibling = isNext ? sibling.getNext() : sibling.getPrevious();
						if ( !sibling || sibling.type != CKEDITOR.NODE_ELEMENT )
							return;
					}

					if ( element.isIdentical( sibling ) ) {
						// Save the last child to be checked too, to merge things like
						// <b><i></i></b><b><i></i></b> => <b><i></i></b>
						var innerSibling = isNext ? element.getLast() : element.getFirst();

						// Move pending nodes first into the target element.
						while ( pendingNodes.length )
							pendingNodes.shift().move( element, !isNext );

						sibling.moveChildren( element, !isNext );
						sibling.remove();

						// Now check the last inner child (see two comments above).
						if ( innerSibling && innerSibling.type == CKEDITOR.NODE_ELEMENT )
							innerSibling.mergeSiblings();
					}
				}
			}

			return function( inlineOnly ) {
				// Merge empty links and anchors also. (https://dev.ckeditor.com/ticket/5567)
				if ( !( inlineOnly === false || CKEDITOR.dtd.$removeEmpty[ this.getName() ] || this.is( 'a' ) ) ) {
					return;
				}

				mergeElements( this, this.getNext(), true );
				mergeElements( this, this.getPrevious() );
			};
		} )(),

		/**
		 * Shows this element (displays it).
		 *
		 *		var element = CKEDITOR.document.getById( 'myElement' );
		 *		element.show();
		 */
		show: function() {
			this.setStyles( {
				display: '',
				visibility: ''
			} );
		},

		/**
		 * Sets the value of an element attribute.
		 *
		 *		var element = CKEDITOR.document.getById( 'myElement' );
		 *		element.setAttribute( 'class', 'myClass' );
		 *		element.setAttribute( 'title', 'This is an example' );
		 *
		 * @method
		 * @param {String} name The name of the attribute.
		 * @param {String} value The value to be set to the attribute.
		 * @returns {CKEDITOR.dom.element} This element instance.
		 */
		setAttribute: ( function() {
			var standard = function( name, value ) {
					this.$.setAttribute( name, value );
					return this;
				};

			if ( CKEDITOR.env.ie && ( CKEDITOR.env.ie7Compat || CKEDITOR.env.quirks ) ) {
				return function( name, value ) {
					if ( name == 'class' )
						this.$.className = value;
					else if ( name == 'style' )
						this.$.style.cssText = value;
					else if ( name == 'tabindex' ) // Case sensitive.
					this.$.tabIndex = value;
					else if ( name == 'checked' )
						this.$.checked = value;
					else if ( name == 'contenteditable' )
						standard.call( this, 'contentEditable', value );
					else
						standard.apply( this, arguments );
					return this;
				};
			} else if ( CKEDITOR.env.ie8Compat && CKEDITOR.env.secure ) {
				return function( name, value ) {
					// IE8 throws error when setting src attribute to non-ssl value. (https://dev.ckeditor.com/ticket/7847)
					if ( name == 'src' && value.match( /^http:\/\// ) ) {
						try {
							standard.apply( this, arguments );
						} catch ( e ) {}
					} else {
						standard.apply( this, arguments );
					}
					return this;
				};
			} else {
				return standard;
			}
		} )(),

		/**
		 * Sets the value of several element attributes.
		 *
		 *		var element = CKEDITOR.document.getById( 'myElement' );
		 *		element.setAttributes( {
		 *			'class':	'myClass',
		 *			title:		'This is an example'
		 *		} );
		 *
		 * @chainable
		 * @param {Object} attributesPairs An object containing the names and
		 * values of the attributes.
		 * @returns {CKEDITOR.dom.element} This element instance.
		 */
		setAttributes: function( attributesPairs ) {
			for ( var name in attributesPairs )
				this.setAttribute( name, attributesPairs[ name ] );
			return this;
		},

		/**
		 * Sets the element value. This function is usually used with form
		 * field element.
		 *
		 * @chainable
		 * @param {String} value The element value.
		 * @returns {CKEDITOR.dom.element} This element instance.
		 */
		setValue: function( value ) {
			this.$.value = value;
			return this;
		},

		/**
		 * Removes an attribute from the element.
		 *
		 *		var element = CKEDITOR.dom.element.createFromHtml( '<div class="classA"></div>' );
		 *		element.removeAttribute( 'class' );
		 *
		 * @method
		 * @param {String} name The attribute name.
		 */
		removeAttribute: ( function() {
			var standard = function( name ) {
					this.$.removeAttribute( name );
				};

			if ( CKEDITOR.env.ie && ( CKEDITOR.env.ie7Compat || CKEDITOR.env.quirks ) ) {
				return function( name ) {
					if ( name == 'class' )
						name = 'className';
					else if ( name == 'tabindex' )
						name = 'tabIndex';
					else if ( name == 'contenteditable' )
						name = 'contentEditable';
					standard.call( this, name );
				};
			} else {
				return standard;
			}
		} )(),

		/**
		 * Removes all element's attributes or just given ones.
		 *
		 * @param {Array} [attributes] The array with attributes names.
		 */
		removeAttributes: function( attributes ) {
			if ( CKEDITOR.tools.isArray( attributes ) ) {
				for ( var i = 0; i < attributes.length; i++ ) {
					this.removeAttribute( attributes[ i ] );
				}
			} else {
				attributes = attributes || this.getAttributes();

				for ( var attr in attributes ) {
					attributes.hasOwnProperty( attr ) && this.removeAttribute( attr );
				}
			}
		},

		/**
		 * Removes a style from the element.
		 *
		 *		var element = CKEDITOR.dom.element.createFromHtml( '<div style="display:none"></div>' );
		 *		element.removeStyle( 'display' );
		 *
		 * @method
		 * @param {String} name The style name.
		 */
		removeStyle: function( name ) {
			// Removes the specified property from the current style object.
			var $ = this.$.style;

			// "removeProperty" need to be specific on the following styles.
			if ( !$.removeProperty && ( name == 'border' || name == 'margin' || name == 'padding' ) ) {
				var names = expandedRules( name );
				for ( var i = 0 ; i < names.length ; i++ )
					this.removeStyle( names[ i ] );
				return;
			}

			$.removeProperty ? $.removeProperty( name ) : $.removeAttribute( CKEDITOR.tools.cssStyleToDomStyle( name ) );

			// Eventually remove empty style attribute.
			if ( !this.$.style.cssText )
				this.removeAttribute( 'style' );
		},

		/**
		 * Sets the value of an element style.
		 *
		 *		var element = CKEDITOR.document.getById( 'myElement' );
		 *		element.setStyle( 'background-color', '#ff0000' );
		 *		element.setStyle( 'margin-top', '10px' );
		 *		element.setStyle( 'float', 'right' );
		 *
		 * @param {String} name The name of the style. The CSS naming notation
		 * must be used (e.g. `background-color`).
		 * @param {String} value The value to be set to the style.
		 * @returns {CKEDITOR.dom.element} This element instance.
		 */
		setStyle: function( name, value ) {
			this.$.style[ CKEDITOR.tools.cssStyleToDomStyle( name ) ] = value;
			return this;
		},

		/**
		 * Sets the value of several element styles.
		 *
		 *		var element = CKEDITOR.document.getById( 'myElement' );
		 *		element.setStyles( {
		 *			position:	'absolute',
		 *			float:		'right'
		 *		} );
		 *
		 * @param {Object} stylesPairs An object containing the names and
		 * values of the styles.
		 * @returns {CKEDITOR.dom.element} This element instance.
		 */
		setStyles: function( stylesPairs ) {
			for ( var name in stylesPairs )
				this.setStyle( name, stylesPairs[ name ] );
			return this;
		},

		/**
		 * Sets the opacity of an element.
		 *
		 *		var element = CKEDITOR.document.getById( 'myElement' );
		 *		element.setOpacity( 0.75 );
		 *
		 * @param {Number} opacity A number within the range `[0.0, 1.0]`.
		 */
		setOpacity: function( opacity ) {
			if ( CKEDITOR.env.ie && CKEDITOR.env.version < 9 ) {
				opacity = Math.round( opacity * 100 );
				this.setStyle( 'filter', opacity >= 100 ? '' : 'progid:DXImageTransform.Microsoft.Alpha(opacity=' + opacity + ')' );
			} else {
				this.setStyle( 'opacity', opacity );
			}
		},

		/**
		 * Makes the element and its children unselectable.
		 *
		 *		var element = CKEDITOR.document.getById( 'myElement' );
		 *		element.unselectable();
		 *
		 * @method
		 */
		unselectable: function() {
			// CSS unselectable.
			this.setStyles( CKEDITOR.tools.cssVendorPrefix( 'user-select', 'none' ) );

			// For IE/Opera which doesn't support for the above CSS style,
			// the unselectable="on" attribute only specifies the selection
			// process cannot start in the element itself, and it doesn't inherit.
			if ( CKEDITOR.env.ie ) {
				this.setAttribute( 'unselectable', 'on' );

				var element,
					elements = this.getElementsByTag( '*' );

				for ( var i = 0, count = elements.count() ; i < count ; i++ ) {
					element = elements.getItem( i );
					element.setAttribute( 'unselectable', 'on' );
				}
			}
		},

		/**
		 * Gets closest positioned (`position != static`) ancestor.
		 *
		 * @returns {CKEDITOR.dom.element} Positioned ancestor or `null`.
		 */
		getPositionedAncestor: function() {
			var current = this;
			while ( current.getName() != 'html' ) {
				if ( current.getComputedStyle( 'position' ) != 'static' )
					return current;

				current = current.getParent();
			}
			return null;
		},

		/**
		 * Gets this element's position in document.
		 *
		 * @param {CKEDITOR.dom.document} [refDocument]
		 * @returns {Object} Element's position.
		 * @returns {Number} return.x
		 * @returns {Number} return.y
		 * @todo refDocument
		 */
		getDocumentPosition: function( refDocument ) {
			var x = 0,
				y = 0,
				doc = this.getDocument(),
				body = doc.getBody(),
				quirks = doc.$.compatMode == 'BackCompat';

			if ( document.documentElement.getBoundingClientRect &&
				( CKEDITOR.env.ie ? CKEDITOR.env.version !== 8 : true ) ) {
				var box = this.$.getBoundingClientRect(),
					$doc = doc.$,
					$docElem = $doc.documentElement;

				var clientTop = $docElem.clientTop || body.$.clientTop || 0,
					clientLeft = $docElem.clientLeft || body.$.clientLeft || 0,
					needAdjustScrollAndBorders = true;

				// https://dev.ckeditor.com/ticket/3804: getBoundingClientRect() works differently on IE and non-IE
				// browsers, regarding scroll positions.
				//
				// On IE, the top position of the <html> element is always 0, no matter
				// how much you scrolled down.
				//
				// On other browsers, the top position of the <html> element is negative
				// scrollTop.
				if ( CKEDITOR.env.ie ) {
					var inDocElem = doc.getDocumentElement().contains( this ),
						inBody = doc.getBody().contains( this );

					needAdjustScrollAndBorders = ( quirks && inBody ) || ( !quirks && inDocElem );
				}

				// https://dev.ckeditor.com/ticket/12747.
				if ( needAdjustScrollAndBorders ) {
					var scrollRelativeLeft,
						scrollRelativeTop;

					// See https://dev.ckeditor.com/ticket/12758 to know more about document.(documentElement|body).scroll(Left|Top) in Webkit.
					if ( CKEDITOR.env.webkit || ( CKEDITOR.env.ie && CKEDITOR.env.version >= 12 ) ) {
						scrollRelativeLeft = body.$.scrollLeft || $docElem.scrollLeft;
						scrollRelativeTop = body.$.scrollTop || $docElem.scrollTop;
					} else {
						var scrollRelativeElement = quirks ? body.$ : $docElem;

						scrollRelativeLeft = scrollRelativeElement.scrollLeft;
						scrollRelativeTop = scrollRelativeElement.scrollTop;
					}

					x = box.left + scrollRelativeLeft - clientLeft;
					y = box.top + scrollRelativeTop - clientTop;
				}
			} else {
				var current = this,
					previous = null,
					offsetParent;
				while ( current && !( current.getName() == 'body' || current.getName() == 'html' ) ) {
					x += current.$.offsetLeft - current.$.scrollLeft;
					y += current.$.offsetTop - current.$.scrollTop;

					// Opera includes clientTop|Left into offsetTop|Left.
					if ( !current.equals( this ) ) {
						x += ( current.$.clientLeft || 0 );
						y += ( current.$.clientTop || 0 );
					}

					var scrollElement = previous;
					while ( scrollElement && !scrollElement.equals( current ) ) {
						x -= scrollElement.$.scrollLeft;
						y -= scrollElement.$.scrollTop;
						scrollElement = scrollElement.getParent();
					}

					previous = current;
					current = ( offsetParent = current.$.offsetParent ) ? new CKEDITOR.dom.element( offsetParent ) : null;
				}
			}

			if ( refDocument ) {
				var currentWindow = this.getWindow(),
					refWindow = refDocument.getWindow();

				if ( !currentWindow.equals( refWindow ) && currentWindow.$.frameElement ) {
					var iframePosition = ( new CKEDITOR.dom.element( currentWindow.$.frameElement ) ).getDocumentPosition( refDocument );

					x += iframePosition.x;
					y += iframePosition.y;
				}
			}

			if ( !document.documentElement.getBoundingClientRect ) {
				// In Firefox, we'll endup one pixel before the element positions,
				// so we must add it here.
				if ( CKEDITOR.env.gecko && !quirks ) {
					x += this.$.clientLeft ? 1 : 0;
					y += this.$.clientTop ? 1 : 0;
				}
			}

			return { x: x, y: y };
		},

		/**
		 * Make any page element visible inside the browser viewport.
		 *
		 * @param {Boolean} [alignToTop=false]
		 */
		scrollIntoView: function( alignToTop ) {
			var parent = this.getParent();
			if ( !parent )
				return;

			// Scroll the element into parent container from the inner out.
			do {
				// Check ancestors that overflows.
				var overflowed =
					parent.$.clientWidth && parent.$.clientWidth < parent.$.scrollWidth ||
					parent.$.clientHeight && parent.$.clientHeight < parent.$.scrollHeight;

				// Skip body element, which will report wrong clientHeight when containing
				// floated content. (https://dev.ckeditor.com/ticket/9523)
				if ( overflowed && !parent.is( 'body' ) )
					this.scrollIntoParent( parent, alignToTop, 1 );

				// Walk across the frame.
				if ( parent.is( 'html' ) ) {
					var win = parent.getWindow();

					// Avoid security error.
					try {
						var iframe = win.$.frameElement;
						iframe && ( parent = new CKEDITOR.dom.element( iframe ) );
					} catch ( er ) {}
				}
			}
			while ( ( parent = parent.getParent() ) );
		},

		/**
		 * Make any page element visible inside one of the ancestors by scrolling the parent.
		 *
		 * @param {CKEDITOR.dom.element/CKEDITOR.dom.window} parent The container to scroll into.
		 * @param {Boolean} [alignToTop] Align the element's top side with the container's
		 * when `true` is specified; align the bottom with viewport bottom when
		 * `false` is specified. Otherwise scroll on either side with the minimum
		 * amount to show the element.
		 * @param {Boolean} [hscroll] Whether horizontal overflow should be considered.
		 */
		scrollIntoParent: function( parent, alignToTop, hscroll ) {
			!parent && ( parent = this.getWindow() );

			var doc = parent.getDocument();
			var isQuirks = doc.$.compatMode == 'BackCompat';

			// On window <html> is scrolled while quirks scrolls <body>.
			if ( parent instanceof CKEDITOR.dom.window )
				parent = isQuirks ? doc.getBody() : doc.getDocumentElement();

			// Scroll the parent by the specified amount.
			function scrollBy( x, y ) {
				// Webkit doesn't support "scrollTop/scrollLeft"
				// on documentElement/body element.
				if ( /body|html/.test( parent.getName() ) )
					parent.getWindow().$.scrollBy( x, y );
				else {
					parent.$.scrollLeft += x;
					parent.$.scrollTop += y;
				}
			}

			// Figure out the element position relative to the specified window.
			function screenPos( element, refWin ) {
				var pos = { x: 0, y: 0 };

				if ( !( element.is( isQuirks ? 'body' : 'html' ) ) ) {
					var box = element.$.getBoundingClientRect();
					pos.x = box.left, pos.y = box.top;
				}

				var win = element.getWindow();
				if ( !win.equals( refWin ) ) {
					var outerPos = screenPos( CKEDITOR.dom.element.get( win.$.frameElement ), refWin );
					pos.x += outerPos.x, pos.y += outerPos.y;
				}

				return pos;
			}

			// calculated margin size.
			function margin( element, side ) {
				return parseInt( element.getComputedStyle( 'margin-' + side ) || 0, 10 ) || 0;
			}

			// [WebKit] Reset stored scrollTop value to not break scrollIntoView() method flow.
			// Scrolling breaks when range.select() is used right after element.scrollIntoView(). (https://dev.ckeditor.com/ticket/14659)
			if ( CKEDITOR.env.webkit ) {
				var editor = this.getEditor( false );

				if ( editor ) {
					editor._.previousScrollTop = null;
				}
			}

			var win = parent.getWindow();

			var thisPos = screenPos( this, win ),
				parentPos = screenPos( parent, win ),
				eh = this.$.offsetHeight,
				ew = this.$.offsetWidth,
				ch = parent.$.clientHeight,
				cw = parent.$.clientWidth,
				lt, br;

			// Left-top margins.
			lt = {
				x: thisPos.x - margin( this, 'left' ) - parentPos.x || 0,
				y: thisPos.y - margin( this, 'top' ) - parentPos.y || 0
			};

			// Bottom-right margins.
			br = {
				x: thisPos.x + ew + margin( this, 'right' ) - ( ( parentPos.x ) + cw ) || 0,
				y: thisPos.y + eh + margin( this, 'bottom' ) - ( ( parentPos.y ) + ch ) || 0
			};

			// 1. Do the specified alignment as much as possible;
			// 2. Otherwise be smart to scroll only the minimum amount;
			// 3. Never cut at the top;
			// 4. DO NOT scroll when already visible.
			if ( lt.y < 0 || br.y > 0 )
				scrollBy( 0, alignToTop === true ? lt.y : alignToTop === false ? br.y : lt.y < 0 ? lt.y : br.y );

			if ( hscroll && ( lt.x < 0 || br.x > 0 ) )
				scrollBy( lt.x < 0 ? lt.x : br.x, 0 );
		},

		/**
		 * Switch the `class` attribute to reflect one of the triple states of an
		 * element in one of {@link CKEDITOR#TRISTATE_ON}, {@link CKEDITOR#TRISTATE_OFF}
		 * or {@link CKEDITOR#TRISTATE_DISABLED}.
		 *
		 *		link.setState( CKEDITOR.TRISTATE_ON );
		 *		// <a class="cke_on" aria-pressed="true">...</a>
		 *		link.setState( CKEDITOR.TRISTATE_OFF );
		 *		// <a class="cke_off">...</a>
		 *		link.setState( CKEDITOR.TRISTATE_DISABLED );
		 *		// <a class="cke_disabled" aria-disabled="true">...</a>
		 *
		 *		span.setState( CKEDITOR.TRISTATE_ON, 'cke_button' );
		 *		// <span class="cke_button_on">...</span>
		 *
		 * @param {Number} state Indicate the element state. One of {@link CKEDITOR#TRISTATE_ON},
		 * {@link CKEDITOR#TRISTATE_OFF}, {@link CKEDITOR#TRISTATE_DISABLED}.
		 * @param [base='cke'] The prefix apply to each of the state class name.
		 * @param [useAria=true] Whether toggle the ARIA state attributes besides of class name change.
		 */
		setState: function( state, base, useAria ) {
			base = base || 'cke';

			switch ( state ) {
				case CKEDITOR.TRISTATE_ON:
					this.addClass( base + '_on' );
					this.removeClass( base + '_off' );
					this.removeClass( base + '_disabled' );
					useAria && this.setAttribute( 'aria-pressed', true );
					useAria && this.removeAttribute( 'aria-disabled' );
					break;

				case CKEDITOR.TRISTATE_DISABLED:
					this.addClass( base + '_disabled' );
					this.removeClass( base + '_off' );
					this.removeClass( base + '_on' );
					useAria && this.setAttribute( 'aria-disabled', true );
					useAria && this.removeAttribute( 'aria-pressed' );
					break;

				default:
					this.addClass( base + '_off' );
					this.removeClass( base + '_on' );
					this.removeClass( base + '_disabled' );
					useAria && this.removeAttribute( 'aria-pressed' );
					useAria && this.removeAttribute( 'aria-disabled' );
					break;
			}
		},

		/**
		 * Returns the inner document of this `<iframe>` element.
		 *
		 * @returns {CKEDITOR.dom.document} The inner document.
		 */
		getFrameDocument: function() {
			var $ = this.$;

			try {
				// In IE, with custom document.domain, it may happen that
				// the iframe is not yet available, resulting in "Access
				// Denied" for the following property access.
				$.contentWindow.document;
			} catch ( e ) {
				// Trick to solve this issue, forcing the iframe to get ready
				// by simply setting its "src" property.
				$.src = $.src;
			}

			return $ && new CKEDITOR.dom.document( $.contentWindow.document );
		},

		/**
		 * Copy all the attributes from one node to the other, kinda like a clone
		 * skipAttributes is an object with the attributes that must **not** be copied.
		 *
		 * @param {CKEDITOR.dom.element} dest The destination element.
		 * @param {Object} skipAttributes A dictionary of attributes to skip.
		 */
		copyAttributes: function( dest, skipAttributes ) {
			var attributes = this.$.attributes;
			skipAttributes = skipAttributes || {};

			for ( var n = 0; n < attributes.length; n++ ) {
				var attribute = attributes[ n ];

				// Lowercase attribute name hard rule is broken for
				// some attribute on IE, e.g. CHECKED.
				var attrName = attribute.nodeName.toLowerCase(),
					attrValue;

				// We can set the type only once, so do it with the proper value, not copying it.
				if ( attrName in skipAttributes )
					continue;

				if ( attrName == 'checked' && ( attrValue = this.getAttribute( attrName ) ) )
					dest.setAttribute( attrName, attrValue );
				// IE contains not specified attributes in $.attributes so we need to check
				// if elements attribute is specified using hasAttribute.
				else if ( !CKEDITOR.env.ie || this.hasAttribute( attrName ) ) {
					attrValue = this.getAttribute( attrName );
					if ( attrValue === null )
						attrValue = attribute.nodeValue;

					dest.setAttribute( attrName, attrValue );
				}
			}

			// The style:
			if ( this.$.style.cssText !== '' )
				dest.$.style.cssText = this.$.style.cssText;
		},

		/**
		 * Changes the tag name of the current element.
		 *
		 * @param {String} newTag The new tag for the element.
		 */
		renameNode: function( newTag ) {
			// If it's already correct exit here.
			if ( this.getName() == newTag )
				return;

			var doc = this.getDocument();

			// Create the new node.
			var newNode = new CKEDITOR.dom.element( newTag, doc );

			// Copy all attributes.
			this.copyAttributes( newNode );

			// Move children to the new node.
			this.moveChildren( newNode );

			// Replace the node.
			this.getParent( true ) && this.$.parentNode.replaceChild( newNode.$, this.$ );
			newNode.$[ 'data-cke-expando' ] = this.$[ 'data-cke-expando' ];
			this.$ = newNode.$;
			// Bust getName's cache. (https://dev.ckeditor.com/ticket/8663)
			delete this.getName;
		},

		/**
		 * Gets a DOM tree descendant under the current node.
		 *
		 *		var strong = p.getChild( 0 );
		 *
		 * @method
		 * @param {Array/Number} indices The child index or array of child indices under the node.
		 * @returns {CKEDITOR.dom.node} The specified DOM child under the current node. Null if child does not exist.
		 */
		getChild: ( function() {
			function getChild( rawNode, index ) {
				var childNodes = rawNode.childNodes;

				if ( index >= 0 && index < childNodes.length )
					return childNodes[ index ];
			}

			return function( indices ) {
				var rawNode = this.$;

				if ( !indices.slice )
					rawNode = getChild( rawNode, indices );
				else {
					indices = indices.slice();
					while ( indices.length > 0 && rawNode )
						rawNode = getChild( rawNode, indices.shift() );
				}

				return rawNode ? new CKEDITOR.dom.node( rawNode ) : null;
			};
		} )(),

		/**
		 * Gets number of element's children.
		 *
		 * @returns {Number}
		 */
		getChildCount: function() {
			return this.$.childNodes.length;
		},

		/**
		 * Disables browser's context menu in this element.
		 */
		disableContextMenu: function() {
			this.on( 'contextmenu', function( evt ) {
				// Cancel the browser context menu.
				if ( !evt.data.getTarget().getAscendant( enablesContextMenu, true ) )
					evt.data.preventDefault();
			} );

			function enablesContextMenu( node ) {
				return node.type == CKEDITOR.NODE_ELEMENT && node.hasClass( 'cke_enable_context_menu' );
			}
		},

		/**
		 * Gets element's direction. Supports both CSS `direction` prop and `dir` attr.
		 */
		getDirection: function( useComputed ) {
			if ( useComputed ) {
				return this.getComputedStyle( 'direction' ) ||
						this.getDirection() ||
						this.getParent() && this.getParent().getDirection( 1 ) ||
						this.getDocument().$.dir ||
						'ltr';
			}
			else {
				return this.getStyle( 'direction' ) || this.getAttribute( 'dir' );
			}
		},

		/**
		 * Gets, sets and removes custom data to be stored as HTML5 data-* attributes.
		 *
		 *		element.data( 'extra-info', 'test' );	// Appended the attribute data-extra-info="test" to the element.
		 *		alert( element.data( 'extra-info' ) );	// 'test'
		 *		element.data( 'extra-info', false );	// Remove the data-extra-info attribute from the element.
		 *
		 * @param {String} name The name of the attribute, excluding the `data-` part.
		 * @param {String} [value] The value to set. If set to false, the attribute will be removed.
		 */
		data: function( name, value ) {
			name = 'data-' + name;
			if ( value === undefined )
				return this.getAttribute( name );
			else if ( value === false )
				this.removeAttribute( name );
			else
				this.setAttribute( name, value );

			return null;
		},

		/**
		 * Retrieves an editor instance which is based on this element (if any).
		 * It basically loops over {@link CKEDITOR#instances} in search for an instance
		 * that uses the element.
		 *
		 *		var element = new CKEDITOR.dom.element( 'div' );
		 *		element.appendTo( CKEDITOR.document.getBody() );
		 *		CKEDITOR.replace( element );
		 *		alert( element.getEditor().name ); // 'editor1'
		 *
		 * By default this method considers only original DOM elements upon which the editor
		 * was created. Setting `optimized` parameter to `false` will consider editor editable
		 * and its children.
		 *
		 * @param {Boolean} [optimized=true] If set to `false` it will scan every editor editable.
		 * @returns {CKEDITOR.editor} An editor instance or null if nothing has been found.
		 */
		getEditor: function( optimized ) {
			var instances = CKEDITOR.instances,
				name, instance, editable;

			optimized = optimized || optimized === undefined;

			for ( name in instances ) {
				instance = instances[ name ];

				if ( instance.element.equals( this ) && instance.elementMode != CKEDITOR.ELEMENT_MODE_APPENDTO )
					return instance;

				if ( !optimized ) {
					editable = instance.editable();

					if ( editable && ( editable.equals( this ) || editable.contains( this ) ) ) {
						return instance;
					}
				}
			}

			return null;
		},

		/**
		 * Returns list of elements within this element that match specified `selector`.
		 *
		 * **Notes:**
		 *
		 *	* Not available in IE7.
		 *	* Returned list is not a live collection (like a result of native `querySelectorAll`).
		 *	* Unlike the native `querySelectorAll` this method ensures selector contextualization. This is:
		 *
		 *			HTML:		'<body><div><i>foo</i></div></body>'
		 *			Native:		div.querySelectorAll( 'body i' ) // ->		[ <i>foo</i> ]
		 *			Method:		div.find( 'body i' ) // ->					[]
		 *						div.find( 'i' ) // ->						[ <i>foo</i> ]
		 *
		 * @since 4.3.0
		 * @param {String} selector A valid [CSS selector](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Selectors).
		 * @returns {CKEDITOR.dom.nodeList}
		 */
		find: function( selector ) {
			var removeTmpId = createTmpId( this ),
				list = new CKEDITOR.dom.nodeList(
					this.$.querySelectorAll( getContextualizedSelector( this, selector ) )
				);

			removeTmpId();

			return list;
		},

		/**
		 * Returns the first element within this element that matches the specified `selector`.
		 *
		 * **Notes:**
		 *
		 *	* Not available in IE7.
		 *	* Unlike the native `querySelector` this method ensures selector contextualization. This is:
		 *
		 *			HTML:		'<body><div><i>foo</i></div></body>'
		 *			Native:		div.querySelector( 'body i' ) // ->			<i>foo</i>
		 *			Method:		div.findOne( 'body i' ) // ->				null
		 *						div.findOne( 'i' ) // ->					<i>foo</i>
		 *
		 * @since 4.3.0
		 * @param {String} selector A valid [CSS selector](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Selectors).
		 * @returns {CKEDITOR.dom.element}
		 */
		findOne: function( selector ) {
			var removeTmpId = createTmpId( this ),
				found = this.$.querySelector( getContextualizedSelector( this, selector ) );

			removeTmpId();

			return found ? new CKEDITOR.dom.element( found ) : null;
		},

		/**
		 * Traverse the DOM of this element (inclusive), executing a callback for
		 * each node.
		 *
		 *		var element = CKEDITOR.dom.element.createFromHtml( '<div><p>foo<b>bar</b>bom</p></div>' );
		 *		element.forEach( function( node ) {
		 *			console.log( node );
		 *		} );
		 *		// Will log:
		 *		// 1. <div> element,
		 *		// 2. <p> element,
		 *		// 3. "foo" text node,
		 *		// 4. <b> element,
		 *		// 5. "bar" text node,
		 *		// 6. "bom" text node.
		 *
		 * @since 4.3.0
		 * @param {Function} callback Function to be executed on every node.
		 * If `callback` returns `false` descendants of the node will be ignored.
		 * @param {CKEDITOR.htmlParser.node} callback.node Node passed as argument.
		 * @param {Number} [type] If specified `callback` will be executed only on
		 * nodes of this type.
		 * @param {Boolean} [skipRoot] Don't execute `callback` on this element.
		 */
		forEach: function( callback, type, skipRoot ) {
			if ( !skipRoot && ( !type || this.type == type ) )
					var ret = callback( this );

			// Do not filter children if callback returned false.
			if ( ret === false )
				return;

			var children = this.getChildren(),
				node,
				i = 0;

			// We do not cache the size, because the live list of nodes may be changed by the callback.
			for ( ; i < children.count(); i++ ) {
				node = children.getItem( i );
				if ( node.type == CKEDITOR.NODE_ELEMENT )
					node.forEach( callback, type );
				else if ( !type || node.type == type )
					callback( node );
			}
		}
	} );

	function createTmpId( element ) {
		var hadId = true;

		if ( !element.$.id ) {
			element.$.id = 'cke_tmp_' + CKEDITOR.tools.getNextNumber();
			hadId = false;
		}

		return function() {
			if ( !hadId )
				element.removeAttribute( 'id' );
		};
	}

	function getContextualizedSelector( element, selector ) {
		var id = CKEDITOR.tools.escapeCss( element.$.id );
		return '#' + id + ' ' + selector.split( /,\s*/ ).join( ', #' + id + ' ' );
	}

	var sides = {
		width: [ 'border-left-width', 'border-right-width', 'padding-left', 'padding-right' ],
		height: [ 'border-top-width', 'border-bottom-width', 'padding-top', 'padding-bottom' ]
	};

	// Generate list of specific style rules, applicable to margin/padding/border.
	function expandedRules( style ) {
		var sides = [ 'top', 'left', 'right', 'bottom' ], components;

		if ( style == 'border' )
				components = [ 'color', 'style', 'width' ];

		var styles = [];
		for ( var i = 0 ; i < sides.length ; i++ ) {

			if ( components ) {
				for ( var j = 0 ; j < components.length ; j++ )
					styles.push( [ style, sides[ i ], components[ j ] ].join( '-' ) );
			} else {
				styles.push( [ style, sides[ i ] ].join( '-' ) );
			}
		}

		return styles;
	}

	function marginAndPaddingSize( type ) {
		var adjustment = 0;
		for ( var i = 0, len = sides[ type ].length; i < len; i++ )
			adjustment += parseFloat( this.getComputedStyle( sides[ type ][ i ] ) || 0, 10 ) || 0;
		return adjustment;
	}

	/**
	 * Sets the element size considering the box model.
	 *
	 * @param {'width'/'height'} type The dimension to set.
	 * @param {Number} size The length unit in px.
	 * @param {Boolean} isBorderBox Apply the size based on the border box model.
	 */
	CKEDITOR.dom.element.prototype.setSize = function( type, size, isBorderBox ) {
		if ( typeof size == 'number' ) {
			if ( isBorderBox && !( CKEDITOR.env.ie && CKEDITOR.env.quirks ) )
				size -= marginAndPaddingSize.call( this, type );

			this.setStyle( type, size + 'px' );
		}
	};

	/**
	 * Gets the element size, possibly considering the box model.
	 *
	 * @param {'width'/'height'} type The dimension to get.
	 * @param {Boolean} isBorderBox Get the size based on the border box model.
	 */
	CKEDITOR.dom.element.prototype.getSize = function( type, isBorderBox ) {
		var size = Math.max( this.$[ 'offset' + CKEDITOR.tools.capitalize( type ) ], this.$[ 'client' + CKEDITOR.tools.capitalize( type ) ] ) || 0;

		if ( isBorderBox )
			size -= marginAndPaddingSize.call( this, type );

		return size;
	};
} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * DocumentFragment is a "lightweight" or "minimal" Document object. It is
 * commonly used to extract a portion of the document's tree or to create a new
 * fragment of the document. Various operations may take document fragment objects
 * as arguments and result in all the child nodes of the document fragment being
 * moved to the child list of this node.
 *
 * @class
 * @constructor Creates a document fragment class instance.
 * @param {CKEDITOR.dom.document/DocumentFragment} [nodeOrDoc=CKEDITOR.document]
 */
CKEDITOR.dom.documentFragment = function( nodeOrDoc ) {
	nodeOrDoc = nodeOrDoc || CKEDITOR.document;

	if ( nodeOrDoc.type == CKEDITOR.NODE_DOCUMENT )
		this.$ = nodeOrDoc.$.createDocumentFragment();
	else
		this.$ = nodeOrDoc;
};

CKEDITOR.tools.extend( CKEDITOR.dom.documentFragment.prototype, CKEDITOR.dom.element.prototype, {
	/**
	 * The node type. This is a constant value set to {@link CKEDITOR#NODE_DOCUMENT_FRAGMENT}.
	 *
	 * @readonly
	 * @property {Number} [=CKEDITOR.NODE_DOCUMENT_FRAGMENT]
	 */
	type: CKEDITOR.NODE_DOCUMENT_FRAGMENT,

	/**
	 * Inserts the document fragment content after the specified node.
	 *
	 * @param {CKEDITOR.dom.node} node
	 */
	insertAfterNode: function( node ) {
		node = node.$;
		node.parentNode.insertBefore( this.$, node.nextSibling );
	},

	/**
	 * Gets the HTML of this document fragment's children.
	 *
	 * @since 4.5.0
	 * @returns {String} The HTML of this document fragment's children.
	 */
	getHtml: function() {
		var container = new CKEDITOR.dom.element( 'div' );

		this.clone( 1, 1 ).appendTo( container );

		return container.getHtml().replace( /\s*data-cke-expando=".*?"/g, '' );
	}
}, true, {
	'append': 1, 'appendBogus': 1, 'clone': 1, 'getFirst': 1, 'getHtml': 1, 'getLast': 1, 'getParent': 1, 'getNext': 1, 'getPrevious': 1,
	'appendTo': 1, 'moveChildren': 1, 'insertBefore': 1, 'insertAfterNode': 1, 'replace': 1, 'trim': 1, 'type': 1,
	'ltrim': 1, 'rtrim': 1, 'getDocument': 1, 'getChildCount': 1, 'getChild': 1, 'getChildren': 1
} );

CKEDITOR.tools.extend( CKEDITOR.dom.documentFragment.prototype, CKEDITOR.dom.document.prototype, true, {
	'find': 1, 'findOne': 1
} );

/**
 * @member CKEDITOR.dom.documentFragment
 * @method append
 * @inheritdoc CKEDITOR.dom.element#append
*/

/**
 * @member CKEDITOR.dom.documentFragment
 * @method appendBogus
 * @inheritdoc CKEDITOR.dom.element#appendBogus
 */

/**
 * @member CKEDITOR.dom.documentFragment
 * @method clone
 * @inheritdoc CKEDITOR.dom.element#clone
 */

/**
 * @member CKEDITOR.dom.documentFragment
 * @method getFirst
 * @inheritdoc CKEDITOR.dom.element#getFirst
 */

/**
 * @member CKEDITOR.dom.documentFragment
 * @method getLast
 * @inheritdoc CKEDITOR.dom.element#getLast
 */

/**
 * @member CKEDITOR.dom.documentFragment
 * @method getParent
 * @inheritdoc CKEDITOR.dom.element#getParent
 */

/**
 * @member CKEDITOR.dom.documentFragment
 * @method getNext
 * @inheritdoc CKEDITOR.dom.element#getNext
 */

/**
 * @member CKEDITOR.dom.documentFragment
 * @method getPrevious
 * @inheritdoc CKEDITOR.dom.element#getPrevious
 */

/**
 * @member CKEDITOR.dom.documentFragment
 * @method appendTo
 * @inheritdoc CKEDITOR.dom.element#appendTo
 */

/**
 * @member CKEDITOR.dom.documentFragment
 * @method moveChildren
 * @inheritdoc CKEDITOR.dom.element#moveChildren
 */

/**
 * @member CKEDITOR.dom.documentFragment
 * @method insertBefore
 * @inheritdoc CKEDITOR.dom.element#insertBefore
 */

/**
 * @member CKEDITOR.dom.documentFragment
 * @method replace
 * @inheritdoc CKEDITOR.dom.element#replace
 */

/**
 * @member CKEDITOR.dom.documentFragment
 * @method trim
 * @inheritdoc CKEDITOR.dom.element#trim
 */

/**
 * @member CKEDITOR.dom.documentFragment
 * @method ltrim
 * @inheritdoc CKEDITOR.dom.element#ltrim
 */

/**
 * @member CKEDITOR.dom.documentFragment
 * @method rtrim
 * @inheritdoc CKEDITOR.dom.element#rtrim
 */

/**
 * @member CKEDITOR.dom.documentFragment
 * @method getDocument
 * @inheritdoc CKEDITOR.dom.element#getDocument
 */

/**
 * @member CKEDITOR.dom.documentFragment
 * @method getChildCount
 * @inheritdoc CKEDITOR.dom.element#getChildCount
 */

/**
 * @member CKEDITOR.dom.documentFragment
 * @method getChild
 * @inheritdoc CKEDITOR.dom.element#getChild
 */

/**
 * @member CKEDITOR.dom.documentFragment
 * @method getChildren
 * @inheritdoc CKEDITOR.dom.element#getChildren
 */

/**
 * @member CKEDITOR.dom.documentFragment
 * @method find
 * @since 4.12.0
 * @inheritdoc CKEDITOR.dom.document#find
 */

/**
 * @member CKEDITOR.dom.documentFragment
 * @method findOne
 * @since 4.12.0
 * @inheritdoc CKEDITOR.dom.document#findOne
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

( function() {
	// This function is to be called under a "walker" instance scope.
	function iterate( rtl, breakOnFalse ) {
		var range = this.range;

		// Return null if we have reached the end.
		if ( this._.end )
			return null;

		// This is the first call. Initialize it.
		if ( !this._.start ) {
			this._.start = 1;

			// A collapsed range must return null at first call.
			if ( range.collapsed ) {
				this.end();
				return null;
			}

			// Move outside of text node edges.
			range.optimize();
		}

		var node,
			startCt = range.startContainer,
			endCt = range.endContainer,
			startOffset = range.startOffset,
			endOffset = range.endOffset,
			guard,
			userGuard = this.guard,
			type = this.type,
			getSourceNodeFn = ( rtl ? 'getPreviousSourceNode' : 'getNextSourceNode' );

		// Create the LTR guard function, if necessary.
		if ( !rtl && !this._.guardLTR ) {
			// The node that stops walker from moving up.
			var limitLTR = endCt.type == CKEDITOR.NODE_ELEMENT ? endCt : endCt.getParent();

			// The node that stops the walker from going to next.
			var blockerLTR = endCt.type == CKEDITOR.NODE_ELEMENT ? endCt.getChild( endOffset ) : endCt.getNext();

			this._.guardLTR = function( node, movingOut ) {
				return ( ( !movingOut || !limitLTR.equals( node ) ) && ( !blockerLTR || !node.equals( blockerLTR ) ) && ( node.type != CKEDITOR.NODE_ELEMENT || !movingOut || !node.equals( range.root ) ) );
			};
		}

		// Create the RTL guard function, if necessary.
		if ( rtl && !this._.guardRTL ) {
			// The node that stops walker from moving up.
			var limitRTL = startCt.type == CKEDITOR.NODE_ELEMENT ? startCt : startCt.getParent();

			// The node that stops the walker from going to next.
			var blockerRTL = startCt.type == CKEDITOR.NODE_ELEMENT ? startOffset ? startCt.getChild( startOffset - 1 ) : null : startCt.getPrevious();

			this._.guardRTL = function( node, movingOut ) {
				return ( ( !movingOut || !limitRTL.equals( node ) ) && ( !blockerRTL || !node.equals( blockerRTL ) ) && ( node.type != CKEDITOR.NODE_ELEMENT || !movingOut || !node.equals( range.root ) ) );
			};
		}

		// Define which guard function to use.
		var stopGuard = rtl ? this._.guardRTL : this._.guardLTR;

		// Make the user defined guard function participate in the process,
		// otherwise simply use the boundary guard.
		if ( userGuard ) {
			guard = function( node, movingOut ) {
				if ( stopGuard( node, movingOut ) === false )
					return false;

				return userGuard( node, movingOut );
			};
		} else {
			guard = stopGuard;
		}

		if ( this.current )
			node = this.current[ getSourceNodeFn ]( false, type, guard );
		else {
			// Get the first node to be returned.
			if ( rtl ) {
				node = endCt;

				if ( node.type == CKEDITOR.NODE_ELEMENT ) {
					if ( endOffset > 0 )
						node = node.getChild( endOffset - 1 );
					else
						node = ( guard( node, true ) === false ) ? null : node.getPreviousSourceNode( true, type, guard );
				}
			} else {
				node = startCt;

				if ( node.type == CKEDITOR.NODE_ELEMENT ) {
					if ( !( node = node.getChild( startOffset ) ) )
						node = ( guard( startCt, true ) === false ) ? null : startCt.getNextSourceNode( true, type, guard );
				}
			}

			if ( node && guard( node ) === false )
				node = null;
		}

		while ( node && !this._.end ) {
			this.current = node;

			if ( !this.evaluator || this.evaluator( node ) !== false ) {
				if ( !breakOnFalse )
					return node;
			} else if ( breakOnFalse && this.evaluator ) {
				return false;
			}

			node = node[ getSourceNodeFn ]( false, type, guard );
		}

		this.end();
		return this.current = null;
	}

	function iterateToLast( rtl ) {
		var node,
			last = null;

		while ( ( node = iterate.call( this, rtl ) ) )
			last = node;

		return last;
	}

	/**
	 * Utility class to "walk" the DOM inside range boundaries. If the
	 * range starts or ends in the middle of the text node, this node will
	 * be included as a whole. Outside changes to the range may break the walker.
	 *
	 * The walker may return nodes that are not totally included in the
	 * range boundaries. Let us take the following range representation,
	 * where the square brackets indicate the boundaries:
	 *
	 *		[<p>Some <b>sample] text</b>
	 *
	 * While walking forward into the above range, the following nodes are
	 * returned: `<p>`, `"Some "`, `<b>` and `"sample"`. Going
	 * backwards instead we have: `"sample"` and `"Some "`. So note that the
	 * walker always returns nodes when "entering" them, but not when
	 * "leaving" them. The {@link #guard} function is instead called both when
	 * entering and when leaving nodes.
	 *
	 * @class
	 */
	CKEDITOR.dom.walker = CKEDITOR.tools.createClass( {
		/**
		 * Creates a walker class instance.
		 *
		 * @constructor
		 * @param {CKEDITOR.dom.range} range The range within which to walk.
		 */
		$: function( range ) {
			this.range = range;

			/**
			 * A function executed for every matched node to check whether
			 * it is to be considered in the walk or not. If not provided, all
			 * matched nodes are considered good.
			 *
			 * If the function returns `false`, the node is ignored.
			 *
			 * @property {Function} evaluator
			 */
			// this.evaluator = null;

			/**
			 * A function executed for every node the walk passes by to check
			 * whether the walk is to be finished. It is called both when
			 * entering and when exiting nodes, as well as for the matched nodes.
			 *
			 * If this function returns `false`, the walking ends and no more
			 * nodes are evaluated.

			 * @property {Function} guard
			 */
			// this.guard = null;

			/** @private */
			this._ = {};
		},

		//		statics :
		//		{
		//			/* Creates a CKEDITOR.dom.walker instance to walk inside DOM boundaries set by nodes.
		//			 * @param {CKEDITOR.dom.node} startNode The node from which the walk
		//			 *		will start.
		//			 * @param {CKEDITOR.dom.node} [endNode] The last node to be considered
		//			 *		in the walk. No more nodes are retrieved after touching or
		//			 *		passing it. If not provided, the walker stops at the
		//			 *		&lt;body&gt; closing boundary.
		//			 * @returns {CKEDITOR.dom.walker} A DOM walker for the nodes between the
		//			 *		provided nodes.
		//			 */
		//			createOnNodes : function( startNode, endNode, startInclusive, endInclusive )
		//			{
		//				var range = new CKEDITOR.dom.range();
		//				if ( startNode )
		//					range.setStartAt( startNode, startInclusive ? CKEDITOR.POSITION_BEFORE_START : CKEDITOR.POSITION_AFTER_END ) ;
		//				else
		//					range.setStartAt( startNode.getDocument().getBody(), CKEDITOR.POSITION_AFTER_START ) ;
		//
		//				if ( endNode )
		//					range.setEndAt( endNode, endInclusive ? CKEDITOR.POSITION_AFTER_END : CKEDITOR.POSITION_BEFORE_START ) ;
		//				else
		//					range.setEndAt( startNode.getDocument().getBody(), CKEDITOR.POSITION_BEFORE_END ) ;
		//
		//				return new CKEDITOR.dom.walker( range );
		//			}
		//		},
		//
		proto: {
			/**
			 * Stops walking. No more nodes are retrieved if this function is called.
			 */
			end: function() {
				this._.end = 1;
			},

			/**
			 * Retrieves the next node (on the right).
			 *
			 * @returns {CKEDITOR.dom.node} The next node or `null` if no more
			 * nodes are available.
			 */
			next: function() {
				return iterate.call( this );
			},

			/**
			 * Retrieves the previous node (on the left).
			 *
			 * @returns {CKEDITOR.dom.node} The previous node or `null` if no more
			 * nodes are available.
			 */
			previous: function() {
				return iterate.call( this, 1 );
			},

			/**
			 * Checks all nodes on the right, executing the evaluation function.
			 *
			 * @returns {Boolean} `false` if the evaluator function returned
			 * `false` for any of the matched nodes. Otherwise `true`.
			 */
			checkForward: function() {
				return iterate.call( this, 0, 1 ) !== false;
			},

			/**
			 * Check all nodes on the left, executing the evaluation function.
			 *
			 * @returns {Boolean} `false` if the evaluator function returned
			 * `false` for any of the matched nodes. Otherwise `true`.
			 */
			checkBackward: function() {
				return iterate.call( this, 1, 1 ) !== false;
			},

			/**
			 * Executes a full walk forward (to the right), until no more nodes
			 * are available, returning the last valid node.
			 *
			 * @returns {CKEDITOR.dom.node} The last node on the right or `null`
			 * if no valid nodes are available.
			 */
			lastForward: function() {
				return iterateToLast.call( this );
			},

			/**
			 * Executes a full walk backwards (to the left), until no more nodes
			 * are available, returning the last valid node.
			 *
			 * @returns {CKEDITOR.dom.node} The last node on the left or `null`
			 * if no valid nodes are available.
			 */
			lastBackward: function() {
				return iterateToLast.call( this, 1 );
			},

			/**
			 * Resets the walker.
			 */
			reset: function() {
				delete this.current;
				this._ = {};
			}

		}
	} );

	// Anything whose display computed style is block, list-item, table,
	// table-row-group, table-header-group, table-footer-group, table-row,
	// table-column-group, table-column, table-cell, table-caption, or whose node
	// name is hr, br (when enterMode is br only) is a block boundary.
	var blockBoundaryDisplayMatch = {
			block: 1, 'list-item': 1, table: 1, 'table-row-group': 1,
			'table-header-group': 1, 'table-footer-group': 1, 'table-row': 1, 'table-column-group': 1,
			'table-column': 1, 'table-cell': 1, 'table-caption': 1
		},
		outOfFlowPositions = { absolute: 1, fixed: 1 };

	/**
	 * Checks whether an element is displayed as a block.
	 *
	 * @member CKEDITOR.dom.element
	 * @param [customNodeNames] Custom list of nodes which will extend
	 * the default {@link CKEDITOR.dtd#$block} list.
	 * @returns {Boolean}
	 */
	CKEDITOR.dom.element.prototype.isBlockBoundary = function( customNodeNames ) {
		// Whether element is in normal page flow. Floated or positioned elements are out of page flow.
		// Don't consider floated or positioned formatting as block boundary, fall back to dtd check in that case. (https://dev.ckeditor.com/ticket/6297)
		var inPageFlow = this.getComputedStyle( 'float' ) == 'none' && !( this.getComputedStyle( 'position' ) in outOfFlowPositions );

		if ( inPageFlow && blockBoundaryDisplayMatch[ this.getComputedStyle( 'display' ) ] )
			return true;

		// Either in $block or in customNodeNames if defined.
		return !!( this.is( CKEDITOR.dtd.$block ) || customNodeNames && this.is( customNodeNames ) );
	};

	/**
	 * Returns a function which checks whether the node is a block boundary.
	 * See {@link CKEDITOR.dom.element#isBlockBoundary}.
	 *
	 * @static
	 * @param customNodeNames
	 * @returns {Function}
	 */
	CKEDITOR.dom.walker.blockBoundary = function( customNodeNames ) {
		return function( node ) {
			return !( node.type == CKEDITOR.NODE_ELEMENT && node.isBlockBoundary( customNodeNames ) );
		};
	};

	/**
	 * @static
	 * @todo
	 */
	CKEDITOR.dom.walker.listItemBoundary = function() {
		return this.blockBoundary( { br: 1 } );
	};

	/**
	 * Returns a function which checks whether the node is a bookmark node or the bookmark node
	 * inner content.
	 *
	 * @static
	 * @param {Boolean} [contentOnly=false] Whether only test against the text content of
	 * a bookmark node instead of the element itself (default).
	 * @param {Boolean} [isReject=false] Whether to return `false` for the bookmark
	 * node instead of `true` (default).
	 * @returns {Function}
	 */
	CKEDITOR.dom.walker.bookmark = function( contentOnly, isReject ) {
		function isBookmarkNode( node ) {
			return ( node && node.getName && node.getName() == 'span' && node.data( 'cke-bookmark' ) );
		}

		return function( node ) {
			var isBookmark, parent;
			// Is bookmark inner text node?
			isBookmark = ( node && node.type != CKEDITOR.NODE_ELEMENT && ( parent = node.getParent() ) && isBookmarkNode( parent ) );
			// Is bookmark node?
			isBookmark = contentOnly ? isBookmark : isBookmark || isBookmarkNode( node );
			return !!( isReject ^ isBookmark );
		};
	};

	/**
	 * Returns a function which checks whether the node is a text node containing only whitespace characters.
	 *
	 * @static
	 * @param {Boolean} [isReject=false]
	 * @returns {Function}
	 */
	CKEDITOR.dom.walker.whitespaces = function( isReject ) {
		return function( node ) {
			var isWhitespace;
			if ( node && node.type == CKEDITOR.NODE_TEXT ) {
				// Whitespace, as well as the Filling Char Sequence text node used in Webkit. (https://dev.ckeditor.com/ticket/9384, https://dev.ckeditor.com/ticket/13816)
				isWhitespace = !CKEDITOR.tools.trim( node.getText() ) ||
					CKEDITOR.env.webkit && node.getText() == CKEDITOR.dom.selection.FILLING_CHAR_SEQUENCE;
			}

			return !!( isReject ^ isWhitespace );
		};
	};

	/**
	 * Returns a function which checks whether the node is invisible in the WYSIWYG mode.
	 *
	 * @static
	 * @param {Boolean} [isReject=false]
	 * @returns {Function}
	 */
	CKEDITOR.dom.walker.invisible = function( isReject ) {
		var whitespace = CKEDITOR.dom.walker.whitespaces(),
			// https://dev.ckeditor.com/ticket/12221 (Chrome) plus https://dev.ckeditor.com/ticket/11111 (Safari).
			offsetWidth0 = CKEDITOR.env.webkit ? 1 : 0;

		return function( node ) {
			var invisible;

			if ( whitespace( node ) )
				invisible = 1;
			else {
				// Visibility should be checked on element.
				if ( node.type == CKEDITOR.NODE_TEXT )
					node = node.getParent();

				// Nodes that take no spaces in wysiwyg:
				// 1. White-spaces but not including NBSP.
				// 2. Empty inline elements, e.g. <b></b>.
				// 3. <br> elements (bogus, surrounded by text) (https://dev.ckeditor.com/ticket/12423).
				invisible = node.$.offsetWidth <= offsetWidth0;
			}

			return !!( isReject ^ invisible );
		};
	};

	/**
	 * Returns a function which checks whether the node type is equal to the passed one.
	 *
	 * @static
	 * @param {Number} type
	 * @param {Boolean} [isReject=false]
	 * @returns {Function}
	 */
	CKEDITOR.dom.walker.nodeType = function( type, isReject ) {
		return function( node ) {
			return !!( isReject ^ ( node.type == type ) );
		};
	};

	/**
	 * Returns a function which checks whether the node is a bogus (filler) node from
	 * `contenteditable` element's point of view.
	 *
	 * @static
	 * @param {Boolean} [isReject=false]
	 * @returns {Function}
	 */
	CKEDITOR.dom.walker.bogus = function( isReject ) {
		function nonEmpty( node ) {
			return !isWhitespaces( node ) && !isBookmark( node );
		}

		return function( node ) {
			var isBogus = CKEDITOR.env.needsBrFiller ? node.is && node.is( 'br' ) : node.getText && tailNbspRegex.test( node.getText() );

			if ( isBogus ) {
				var parent = node.getParent(),
					next = node.getNext( nonEmpty );

				isBogus = parent.isBlockBoundary() && ( !next || next.type == CKEDITOR.NODE_ELEMENT && next.isBlockBoundary() );
			}

			return !!( isReject ^ isBogus );
		};
	};

	/**
	 * Returns a function which checks whether the node is a temporary element
	 * (element with the `data-cke-temp` attribute) or its child.
	 *
	 * @since 4.3.0
	 * @static
	 * @param {Boolean} [isReject=false] Whether to return `false` for the
	 * temporary element instead of `true` (default).
	 * @returns {Function}
	 */
	CKEDITOR.dom.walker.temp = function( isReject ) {
		return function( node ) {
			if ( node.type != CKEDITOR.NODE_ELEMENT )
				node = node.getParent();

			var isTemp = node && node.hasAttribute( 'data-cke-temp' );

			return !!( isReject ^ isTemp );
		};
	};

	var tailNbspRegex = /^[\t\r\n ]*(?:&nbsp;|\xa0)$/,
		isWhitespaces = CKEDITOR.dom.walker.whitespaces(),
		isBookmark = CKEDITOR.dom.walker.bookmark(),
		isTemp = CKEDITOR.dom.walker.temp(),
		toSkip = function( node ) {
			return isBookmark( node ) ||
				isWhitespaces( node ) ||
				node.type == CKEDITOR.NODE_ELEMENT && node.is( CKEDITOR.dtd.$inline ) && !node.is( CKEDITOR.dtd.$empty );
		};

	/**
	 * Returns a function which checks whether the node should be ignored in terms of "editability".
	 *
	 * This includes:
	 *
	 * * whitespaces (see {@link CKEDITOR.dom.walker#whitespaces}),
	 * * bookmarks (see {@link CKEDITOR.dom.walker#bookmark}),
	 * * temporary elements (see {@link CKEDITOR.dom.walker#temp}).
	 *
	 * @since 4.3.0
	 * @static
	 * @param {Boolean} [isReject=false] Whether to return `false` for the
	 * ignored element instead of `true` (default).
	 * @returns {Function}
	 */
	CKEDITOR.dom.walker.ignored = function( isReject ) {
		return function( node ) {
			var isIgnored = isWhitespaces( node ) || isBookmark( node ) || isTemp( node );

			return !!( isReject ^ isIgnored );
		};
	};

	var isIgnored = CKEDITOR.dom.walker.ignored();

	/**
	 * Returns a function which checks whether the node is empty.
	 *
	 * @since 4.5.0
	 * @static
	 * @param {Boolean} [isReject=false] Whether to return `false` for the
	 * ignored element instead of `true` (default).
	 * @returns {Function}
	 */
	CKEDITOR.dom.walker.empty = function( isReject ) {
		return function( node ) {
			var i = 0,
				l = node.getChildCount();

			for ( ; i < l; ++i ) {
				if ( !isIgnored( node.getChild( i ) ) ) {
					return !!isReject;
				}
			}

			return !isReject;
		};
	};

	var isEmpty = CKEDITOR.dom.walker.empty();

	function filterTextContainers( dtd ) {
		var hash = {},
			name;

		for ( name in dtd ) {
			if ( CKEDITOR.dtd[ name ][ '#' ] )
				hash[ name ] = 1;
		}
		return hash;
	}

	/**
	 * A hash of element names which in browsers that {@link CKEDITOR.env#needsBrFiller do not need `<br>` fillers}
	 * can be selection containers despite being empty.
	 *
	 * @since 4.5.0
	 * @static
	 * @property {Object} validEmptyBlockContainers
	 */
	var validEmptyBlocks = CKEDITOR.dom.walker.validEmptyBlockContainers = CKEDITOR.tools.extend(
		filterTextContainers( CKEDITOR.dtd.$block ),
		{ caption: 1, td: 1, th: 1 }
	);

	function isEditable( node ) {
		// Skip temporary elements, bookmarks and whitespaces.
		if ( isIgnored( node ) )
			return false;

		if ( node.type == CKEDITOR.NODE_TEXT )
			return true;

		if ( node.type == CKEDITOR.NODE_ELEMENT ) {
			// All inline and non-editable elements are valid editable places.
			// Note: the <hr> is currently the only element in CKEDITOR.dtd.$empty and CKEDITOR.dtd.$block,
			// but generally speaking we need an intersection of these two sets.
			// Note: non-editable block has to be treated differently (should be selected entirely).
			if ( node.is( CKEDITOR.dtd.$inline ) || node.is( 'hr' ) || node.getAttribute( 'contenteditable' ) == 'false' )
				return true;

			// Empty blocks are editable on IE.
			if ( !CKEDITOR.env.needsBrFiller && node.is( validEmptyBlocks ) && isEmpty( node ) )
				return true;
		}

		// Skip all other nodes.
		return false;
	}

	/**
	 * Returns a function which checks whether the node can be a container or a sibling
	 * of the selection end.
	 *
	 * This includes:
	 *
	 * * text nodes (but not whitespaces),
	 * * inline elements,
	 * * intersection of {@link CKEDITOR.dtd#$empty} and {@link CKEDITOR.dtd#$block} (currently
	 * it is only `<hr>`),
	 * * non-editable blocks (special case &mdash; such blocks cannot be containers nor
	 * siblings, they need to be selected entirely),
	 * * empty {@link #validEmptyBlockContainers blocks} which can contain text
	 * ({@link CKEDITOR.env#needsBrFiller old IEs only}).
	 *
	 * @since 4.3.0
	 * @static
	 * @param {Boolean} [isReject=false] Whether to return `false` for the
	 * ignored element instead of `true` (default).
	 * @returns {Function}
	 */
	CKEDITOR.dom.walker.editable = function( isReject ) {
		return function( node ) {
			return !!( isReject ^ isEditable( node ) );
		};
	};

	/**
	 * Checks if there is a filler node at the end of an element, and returns it.
	 *
	 * @member CKEDITOR.dom.element
	 * @returns {CKEDITOR.dom.node/Boolean} Bogus node or `false`.
	 */
	CKEDITOR.dom.element.prototype.getBogus = function() {
		// Bogus are not always at the end, e.g. <p><a>text<br /></a></p> (https://dev.ckeditor.com/ticket/7070).
		var tail = this;
		do {
			tail = tail.getPreviousSourceNode();
		}
		while ( toSkip( tail ) );

		if ( tail && ( CKEDITOR.env.needsBrFiller ? tail.is && tail.is( 'br' ) : tail.getText && tailNbspRegex.test( tail.getText() ) ) )
			return tail;

		return false;
	};

} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * Represents a delimited piece of content in a DOM Document.
 * It is contiguous in the sense that it can be characterized as selecting all
 * of the content between a pair of boundary-points.
 *
 * This class shares much of the W3C
 * [Document Object Model Range](http://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html)
 * ideas and features, adding several range manipulation tools to it, but it's
 * not intended to be compatible with it.
 *
 *		// Create a range for the entire contents of the editor document body.
 *		var range = new CKEDITOR.dom.range( editor.document );
 *		range.selectNodeContents( editor.document.getBody() );
 *		// Delete the contents.
 *		range.deleteContents();
 *
 * Usually you will want to work on a ranges rooted in the editor's {@link CKEDITOR.editable editable}
 * element. Such ranges can be created with a shorthand method &ndash; {@link CKEDITOR.editor#createRange editor.createRange}.
 *
 *		var range = editor.createRange();
 *		range.root.equals( editor.editable() ); // -> true
 *
 * Note that the {@link #root} of a range is an important property, which limits many
 * algorithms implemented in range's methods. Therefore it is crucial, especially
 * when using ranges inside inline editors, to specify correct root, so using
 * the {@link CKEDITOR.editor#createRange} method is highly recommended.
 *
 * ### Selection
 *
 * Range is only a logical representation of a piece of content in a DOM. It should not
 * be confused with a {@link CKEDITOR.dom.selection selection} which represents "physically
 * marked" content. It is possible to create unlimited number of various ranges, when
 * only one real selection may exist at a time in a document. Ranges are used to read position
 * of selection in the DOM and to move selection to new positions.
 *
 * The editor selection may be retrieved using the {@link CKEDITOR.editor#getSelection} method:
 *
 *		var sel = editor.getSelection(),
 *			ranges = sel.getRanges(); // CKEDITOR.dom.rangeList instance.
 *
 *		var range = ranges[ 0 ];
 *		range.root; // -> editor's editable element.
 *
 * A range can also be selected:
 *
 *		var range = editor.createRange();
 *		range.selectNodeContents( editor.editable() );
 *		sel.selectRanges( [ range ] );
 *
 * @class
 * @constructor Creates a {@link CKEDITOR.dom.range} instance that can be used inside a specific DOM Document.
 * @param {CKEDITOR.dom.document/CKEDITOR.dom.element} root The document or element
 * within which the range will be scoped.
 * @todo global "TODO" - precise algorithms descriptions needed for the most complex methods like #enlarge.
 */
CKEDITOR.dom.range = function( root ) {
	/**
	 * Node within which the range begins.
	 *
	 *		var range = new CKEDITOR.dom.range( editor.document );
	 *		range.selectNodeContents( editor.document.getBody() );
	 *		alert( range.startContainer.getName() ); // 'body'
	 *
	 * @readonly
	 * @property {CKEDITOR.dom.element/CKEDITOR.dom.text}
	 */
	this.startContainer = null;

	/**
	 * Offset within the starting node of the range.
	 *
	 *		var range = new CKEDITOR.dom.range( editor.document );
	 *		range.selectNodeContents( editor.document.getBody() );
	 *		alert( range.startOffset ); // 0
	 *
	 * @readonly
	 * @property {Number}
	 */
	this.startOffset = null;

	/**
	 * Node within which the range ends.
	 *
	 *		var range = new CKEDITOR.dom.range( editor.document );
	 *		range.selectNodeContents( editor.document.getBody() );
	 *		alert( range.endContainer.getName() ); // 'body'
	 *
	 * @readonly
	 * @property {CKEDITOR.dom.element/CKEDITOR.dom.text}
	 */
	this.endContainer = null;

	/**
	 * Offset within the ending node of the range.
	 *
	 *		var range = new CKEDITOR.dom.range( editor.document );
	 *		range.selectNodeContents( editor.document.getBody() );
	 *		alert( range.endOffset ); // == editor.document.getBody().getChildCount()
	 *
	 * @readonly
	 * @property {Number}
	 */
	this.endOffset = null;

	/**
	 * Indicates that this is a collapsed range. A collapsed range has its
	 * start and end boundaries at the very same point so nothing is contained
	 * in it.
	 *
	 *		var range = new CKEDITOR.dom.range( editor.document );
	 *		range.selectNodeContents( editor.document.getBody() );
	 *		alert( range.collapsed ); // false
	 *		range.collapse();
	 *		alert( range.collapsed ); // true
	 *
	 * @readonly
	 */
	this.collapsed = true;

	var isDocRoot = root instanceof CKEDITOR.dom.document;
	/**
	 * The document within which the range can be used.
	 *
	 *		// Selects the body contents of the range document.
	 *		range.selectNodeContents( range.document.getBody() );
	 *
	 * @readonly
	 * @property {CKEDITOR.dom.document}
	 */
	this.document = isDocRoot ? root : root.getDocument();

	/**
	 * The ancestor DOM element within which the range manipulation are limited.
	 *
	 * @readonly
	 * @property {CKEDITOR.dom.element}
	 */
	this.root = isDocRoot ? root.getBody() : root;
};

( function() {
	// Updates the "collapsed" property for the given range object.
	function updateCollapsed( range ) {
		range.collapsed = ( range.startContainer && range.endContainer && range.startContainer.equals( range.endContainer ) && range.startOffset == range.endOffset );
	}

	// This is a shared function used to delete, extract and clone the range content.
	//
	// The outline of the algorithm:
	//
	// 1. Normalization. We handle special cases, split text nodes if we can, find boundary nodes (startNode and endNode).
	// 2. Gathering data.
	//   * We start by creating two arrays of boundary nodes parents. You can imagine these arrays as lines limiting
	//   the tree from the left and right and thus marking the part which is selected by the range. The both lines
	//   start in the same node which is the range.root and end in startNode and endNode.
	//   * Then we find min level and max levels. Level represents all nodes which are equally far from the range.root.
	//   Min level is the level at which the left and right boundaries diverged (the first diverged level). And max levels
	//   are how deep the start and end nodes are nested.
	// 3. Cloning/extraction.
	//   * We start iterating over start node parents (left branch) from min level and clone the parent (usually shallow clone,
	//   because we know that it's not fully selected) and its right siblings (deep clone, because they are fully selected).
	//   We iterate over siblings up to meeting end node parent or end of the siblings chain.
	//   * We clone level after level down to the startNode.
	//   * Then we do the same with end node parents (right branch), because it may contains notes we omit during the previous
	//   step, for example if the right branch is deeper then left branch. Things are more complicated here because we have to
	//   watch out for nodes that were already cloned.
	//   * ***Note:** Setting `cloneId` option to `false` for **extraction** works for partially selected elements only.
	//   See range.extractContents to know more.
	// 4. Clean up.
	//   * There are two things we need to do - updating the range position and perform the action of the "mergeThen"
	//   param (see range.deleteContents or range.extractContents).
	//   See comments in mergeAndUpdate because this is lots of fun too.
	function execContentsAction( range, action, docFrag, mergeThen, cloneId ) {
		'use strict';

		range.optimizeBookmark();

		var isDelete = action === 0;
		var isExtract = action == 1;
		var isClone = action == 2;
		var doClone = isClone || isExtract;

		var startNode = range.startContainer;
		var endNode = range.endContainer;

		var startOffset = range.startOffset;
		var endOffset = range.endOffset;

		var cloneStartNode;
		var cloneEndNode;

		var doNotRemoveStartNode;
		var doNotRemoveEndNode;

		var cloneStartText;
		var cloneEndText;

		// Handle here an edge case where we clone a range which is located in one text node.
		// This allows us to not think about startNode == endNode case later on.
		// We do that only when cloning, because in other cases we can safely split this text node
		// and hence we can easily handle this case as many others.

		// We need to handle situation when selection startNode is type of NODE_ELEMENT (#426).
		if ( isClone &&
			endNode.type == CKEDITOR.NODE_TEXT &&
			( startNode.equals( endNode ) || ( startNode.type === CKEDITOR.NODE_ELEMENT && startNode.getFirst().equals( endNode ) ) ) ) {

			// Here we should always be inside one text node.
			docFrag.append( range.document.createText( endNode.substring( startOffset, endOffset ) ) );
			return;
		}

		// For text containers, we must simply split the node and point to the
		// second part. The removal will be handled by the rest of the code.
		if ( endNode.type == CKEDITOR.NODE_TEXT ) {
			// If Extract or Delete we can split the text node,
			// but if Clone (2), then we cannot modify the DOM (https://dev.ckeditor.com/ticket/11586) so we mark the text node for cloning.
			if ( !isClone ) {
				endNode = endNode.split( endOffset );
			} else {
				cloneEndText = true;
			}
		} else {
			// If there's no node after the range boundary we set endNode to the previous node
			// and mark it to be cloned.
			if ( endNode.getChildCount() > 0 ) {
				// If the offset points after the last node.
				if ( endOffset >= endNode.getChildCount() ) {
					endNode = endNode.getChild( endOffset - 1 );
					cloneEndNode = true;
				} else {
					endNode = endNode.getChild( endOffset );
				}
			}
			// The end container is empty (<h1>]</h1>), but we want to clone it, although not remove.
			else {
				cloneEndNode = true;
				doNotRemoveEndNode = true;
			}
		}

		// For text containers, we must simply split the node. The removal will
		// be handled by the rest of the code .
		if ( startNode.type == CKEDITOR.NODE_TEXT ) {
			// If Extract or Delete we can split the text node,
			// but if Clone (2), then we cannot modify the DOM (https://dev.ckeditor.com/ticket/11586) so we mark
			// the text node for cloning.
			if ( !isClone ) {
				startNode.split( startOffset );
			} else {
				cloneStartText = true;
			}
		} else {
			// If there's no node before the range boundary we set startNode to the next node
			// and mark it to be cloned.
			if ( startNode.getChildCount() > 0 ) {
				if ( startOffset === 0 ) {
					startNode = startNode.getChild( startOffset );
					cloneStartNode = true;
				} else {
					startNode = startNode.getChild( startOffset - 1 );
				}
			}
			// The start container is empty (<h1>[</h1>), but we want to clone it, although not remove.
			else {
				cloneStartNode = true;
				doNotRemoveStartNode = true;
			}
		}

			// Get the parent nodes tree for the start and end boundaries.
		var startParents = startNode.getParents(),
			endParents = endNode.getParents(),
			// Level at which start and end boundaries diverged.
			minLevel = findMinLevel(),
			maxLevelLeft = startParents.length - 1,
			maxLevelRight = endParents.length - 1,
			// Keeps the frag/element which is parent of the level that we are currently cloning.
			levelParent = docFrag,
			nextLevelParent,
			leftNode,
			rightNode,
			nextSibling,
			// Keeps track of the last connected level (on which left and right branches are connected)
			// Usually this is minLevel, but not always.
			lastConnectedLevel = -1;

		// THE LEFT BRANCH.
		for ( var level = minLevel; level <= maxLevelLeft; level++ ) {
			leftNode = startParents[ level ];
			nextSibling = leftNode.getNext();

			// 1.
			// The first step is to handle partial selection of the left branch.

			// Max depth of the left branch. It means that ( leftSibling == endNode ).
			// We also check if the leftNode isn't only partially selected, because in this case
			// we want to make a shallow clone of it (the else part).
			if ( level == maxLevelLeft && !( leftNode.equals( endParents[ level ] ) && maxLevelLeft < maxLevelRight ) ) {
				if ( cloneStartNode ) {
					consume( leftNode, levelParent, false, doNotRemoveStartNode );
				} else if ( cloneStartText ) {
					levelParent.append( range.document.createText( leftNode.substring( startOffset ) ) );
				}
			} else if ( doClone ) {
				nextLevelParent = levelParent.append( leftNode.clone( 0, cloneId ) );
			}

			// 2.
			// The second step is to handle full selection of the content between the left branch and the right branch.

			while ( nextSibling ) {
				// We can't clone entire endParent just like we can't clone entire startParent -
				// - they are not fully selected with the range. Partial endParent selection
				// will be cloned in the next loop.
				if ( nextSibling.equals( endParents[ level ] ) ) {
					lastConnectedLevel = level;
					break;
				}

				nextSibling = consume( nextSibling, levelParent );
			}

			levelParent = nextLevelParent;
		}

		// Reset levelParent, because we reset the level.
		levelParent = docFrag;

		// THE RIGHT BRANCH.
		for ( level = minLevel; level <= maxLevelRight; level++ ) {
			rightNode = endParents[ level ];
			nextSibling = rightNode.getPrevious();

			// Do not process this node if it is shared with the left branch
			// because it was already processed.
			//
			// Note: Don't worry about text nodes selection - if the entire range was placed in a single text node
			// it was handled as a special case at the beginning. In other cases when startNode == endNode
			// or when on this level leftNode == rightNode (so rightNode.equals( startParents[ level ] ))
			// this node was handled by the previous loop.
			if ( !rightNode.equals( startParents[ level ] ) ) {
				// 1.
				// The first step is to handle partial selection of the right branch.

				// Max depth of the right branch. It means that ( rightNode == endNode ).
				// We also check if the rightNode isn't only partially selected, because in this case
				// we want to make a shallow clone of it (the else part).
				if ( level == maxLevelRight && !( rightNode.equals( startParents[ level ] ) && maxLevelRight < maxLevelLeft ) ) {
					if ( cloneEndNode ) {
						consume( rightNode, levelParent, false, doNotRemoveEndNode );
					} else if ( cloneEndText ) {
						levelParent.append( range.document.createText( rightNode.substring( 0, endOffset ) ) );
					}
				} else if ( doClone ) {
					nextLevelParent = levelParent.append( rightNode.clone( 0, cloneId ) );
				}

				// 2.
				// The second step is to handle all left (selected) siblings of the rightNode which
				// have not yet been handled. If the level branches were connected, the previous loop
				// already copied all siblings (except the current rightNode).
				if ( level > lastConnectedLevel ) {
					while ( nextSibling ) {
						nextSibling = consume( nextSibling, levelParent, true );
					}
				}

				levelParent = nextLevelParent;
			} else if ( doClone ) {
				// If this is "shared" node and we are in cloning mode we have to update levelParent to
				// reflect that we visited the node (even though we didn't process it).
				// If we don't do that, in next iterations nodes will be appended to wrong parent.
				//
				// We can just take first child because the algorithm guarantees
				// that this will be the only child on this level. (https://dev.ckeditor.com/ticket/13568)
				levelParent = levelParent.getChild( 0 );
			}
		}

		// Delete or Extract.
		// We need to update the range and if mergeThen was passed do it.
		if ( !isClone ) {
			mergeAndUpdate();
		}

		// Depending on an action:
		// * clones node and adds to new parent,
		// * removes node,
		// * moves node to the new parent.
		function consume( node, newParent, toStart, forceClone ) {
			var nextSibling = toStart ? node.getPrevious() : node.getNext();

			// We do not clone if we are only deleting, so do nothing.
			if ( forceClone && isDelete ) {
				return nextSibling;
			}

			// If cloning, just clone it.
			if ( isClone || forceClone ) {
				newParent.append( node.clone( true, cloneId ), toStart );
			} else {
				// Both Delete and Extract will remove the node.
				node.remove();

				// When Extracting, move the removed node to the docFrag.
				if ( isExtract ) {
					newParent.append( node, toStart );
				}
			}

			return nextSibling;
		}

		// Finds a level number on which both branches starts diverging.
		// If such level does not exist, return the last on which both branches have nodes.
		function findMinLevel() {
			// Compare them, to find the top most siblings.
			var i, topStart, topEnd,
				maxLevel = Math.min( startParents.length, endParents.length );

			for ( i = 0; i < maxLevel; i++ ) {
				topStart = startParents[ i ];
				topEnd = endParents[ i ];

				// The compared nodes will match until we find the top most siblings (different nodes that have the same parent).
				// "i" will hold the index in the parents array for the top most element.
				if ( !topStart.equals( topEnd ) ) {
					return i;
				}
			}

			// When startNode == endNode.
			return i - 1;
		}

		// Executed only when deleting or extracting to update range position
		// and perform the merge operation.
		function mergeAndUpdate() {
			var commonLevel = minLevel - 1,
				boundariesInEmptyNode = doNotRemoveStartNode && doNotRemoveEndNode && !startNode.equals( endNode );

			// If a node has been partially selected, collapse the range between
			// startParents[ minLevel + 1 ] and endParents[ minLevel + 1 ] (the first diverged elements).
			// Otherwise, simply collapse it to the start. (W3C specs).
			//
			// All clear, right?
			//
			// It took me few hours to truly understand a previous version of this condition.
			// Mine seems to be more straightforward (even if it doesn't look so) and I could leave you here
			// without additional comments, but I'm not that mean so here goes the explanation.
			//
			// We want to know if both ends of the range are anchored in the same element. Really. It's this simple.
			// But why? Because we need to differentiate situations like:
			//
			// <p>foo[<b>x</b>bar]y</p>		(commonLevel = p, maxLL = "foo", maxLR = "y")
			// from:
			// <p>foo<b>x[</b>bar]y</p>		(commonLevel = p, maxLL = "x", maxLR = "y")
			//
			// In the first case we can collapse the range to the left, because simply everything between range's
			// boundaries was removed.
			// In the second case we must place the range after </b>, because <b> was only **partially selected**.
			//
			// * <b> is our startParents[ commonLevel + 1 ]
			// * "y" is our endParents[ commonLevel + 1 ].
			//
			// By now "bar" is removed from the DOM so <b> is a direct sibling of "y":
			// <p>foo<b>x</b>y</p>
			//
			// Therefore it's enough to place the range between <b> and "y".
			//
			// Now, what does the comparison mean? Why not just taking startNode and endNode and checking
			// their parents? Because the tree is already changed and they may be gone. Plus, thanks to
			// cloneStartNode and cloneEndNode, that would be reaaaaly tricky.
			//
			// So we play with levels which can give us the same information:
			// * commonLevel - the level of common ancestor,
			// * maxLevel - 1 - the level of range boundary parent (range boundary is here like a bookmark span).
			// * commonLevel < maxLevel - 1 - whether the range boundary is not a child of common ancestor.
			//
			// There's also an edge case in which both range boundaries were placed in empty nodes like:
			// <p>[</p><p>]</p>
			// Those boundaries were not removed, but in this case start and end nodes are child of the common ancestor.
			// We handle this edge case separately.
			if ( commonLevel < ( maxLevelLeft - 1 ) || commonLevel < ( maxLevelRight - 1 ) || boundariesInEmptyNode ) {
				if ( boundariesInEmptyNode ) {
					range.moveToPosition( endNode, CKEDITOR.POSITION_BEFORE_START );
				} else if ( ( maxLevelRight == commonLevel + 1 ) && cloneEndNode ) {
					// The maxLevelRight + 1 element could be already removed so we use the fact that
					// we know that it was the last element in its parent.
					range.moveToPosition( endParents[ commonLevel ], CKEDITOR.POSITION_BEFORE_END );
				} else {
					range.moveToPosition( endParents[ commonLevel + 1 ], CKEDITOR.POSITION_BEFORE_START );
				}

				// Merge split parents.
				if ( mergeThen ) {
					// Find the first diverged node in the left branch.
					var topLeft = startParents[ commonLevel + 1 ];

					// TopLeft may simply not exist if commonLevel == maxLevel or may be a text node.
					if ( topLeft && topLeft.type == CKEDITOR.NODE_ELEMENT ) {
						var span = CKEDITOR.dom.element.createFromHtml( '<span ' +
							'data-cke-bookmark="1" style="display:none">&nbsp;</span>', range.document );
						span.insertAfter( topLeft );
						topLeft.mergeSiblings( false );
						range.moveToBookmark( { startNode: span } );
					}
				}
			} else {
				// Collapse it to the start.
				range.collapse( true );
			}
		}
	}

	var inlineChildReqElements = {
		abbr: 1, acronym: 1, b: 1, bdo: 1, big: 1, cite: 1, code: 1, del: 1,
		dfn: 1, em: 1, font: 1, i: 1, ins: 1, label: 1, kbd: 1, q: 1, samp: 1, small: 1, span: 1, strike: 1,
		strong: 1, sub: 1, sup: 1, tt: 1, u: 1, 'var': 1
	};

	// Creates the appropriate node evaluator for the dom walker used inside
	// check(Start|End)OfBlock.
	function getCheckStartEndBlockEvalFunction() {
		var skipBogus = false,
			whitespaces = CKEDITOR.dom.walker.whitespaces(),
			bookmarkEvaluator = CKEDITOR.dom.walker.bookmark( true ),
			isBogus = CKEDITOR.dom.walker.bogus();

		return function( node ) {
			// First skip empty nodes
			if ( bookmarkEvaluator( node ) || whitespaces( node ) )
				return true;

			// Skip the bogus node at the end of block.
			if ( isBogus( node ) && !skipBogus ) {
				skipBogus = true;
				return true;
			}

			// If there's any visible text, then we're not at the start.
			if ( node.type == CKEDITOR.NODE_TEXT &&
				( node.hasAscendant( 'pre' ) ||
					CKEDITOR.tools.trim( node.getText() ).length ) ) {
				return false;
			}

			// If there are non-empty inline elements (e.g. <img />), then we're not
			// at the start.
			if ( node.type == CKEDITOR.NODE_ELEMENT && !node.is( inlineChildReqElements ) )
				return false;

			return true;
		};
	}

	var isBogus = CKEDITOR.dom.walker.bogus(),
		nbspRegExp = /^[\t\r\n ]*(?:&nbsp;|\xa0)$/,
		editableEval = CKEDITOR.dom.walker.editable(),
		notIgnoredEval = CKEDITOR.dom.walker.ignored( true );

	// Evaluator for CKEDITOR.dom.element::checkBoundaryOfElement, reject any
	// text node and non-empty elements unless it's being bookmark text.
	function elementBoundaryEval( checkStart ) {
		var whitespaces = CKEDITOR.dom.walker.whitespaces(),
			bookmark = CKEDITOR.dom.walker.bookmark( 1 );

		return function( node ) {
			// First skip empty nodes.
			if ( bookmark( node ) || whitespaces( node ) )
				return true;

			// Tolerant bogus br when checking at the end of block.
			// Reject any text node unless it's being bookmark
			// OR it's spaces.
			// Reject any element unless it's being invisible empty. (https://dev.ckeditor.com/ticket/3883)
			return !checkStart && isBogus( node ) ||
				node.type == CKEDITOR.NODE_ELEMENT &&
				node.is( CKEDITOR.dtd.$removeEmpty );
		};
	}

	function getNextEditableNode( isPrevious ) {
		return function() {
			var first;

			return this[ isPrevious ? 'getPreviousNode' : 'getNextNode' ]( function( node ) {
				// Cache first not ignorable node.
				if ( !first && notIgnoredEval( node ) )
					first = node;

				// Return true if found editable node, but not a bogus next to start of our lookup (first != bogus).
				return editableEval( node ) && !( isBogus( node ) && node.equals( first ) );
			} );
		};
	}

	CKEDITOR.dom.range.prototype = {
		/**
		 * Clones this range.
		 *
		 * @returns {CKEDITOR.dom.range}
		 */
		clone: function() {
			var clone = new CKEDITOR.dom.range( this.root );

			clone._setStartContainer( this.startContainer );
			clone.startOffset = this.startOffset;
			clone._setEndContainer( this.endContainer );
			clone.endOffset = this.endOffset;
			clone.collapsed = this.collapsed;

			return clone;
		},

		/**
		 * Makes the range collapsed by moving its start point (or end point if `toStart==true`)
		 * to the second end.
		 *
		 * @param {Boolean} toStart Collapse range "to start".
		 */
		collapse: function( toStart ) {
			if ( toStart ) {
				this._setEndContainer( this.startContainer );
				this.endOffset = this.startOffset;
			} else {
				this._setStartContainer( this.endContainer );
				this.startOffset = this.endOffset;
			}

			this.collapsed = true;
		},

		/**
		 * Clones content nodes of the range and adds them to a document fragment, which is returned.
		 *
		 * @param {Boolean} [cloneId=true] Whether to preserve ID attributes in the clone.
		 * @returns {CKEDITOR.dom.documentFragment} Document fragment containing a clone of range's content.
		 */
		cloneContents: function( cloneId ) {
			var docFrag = new CKEDITOR.dom.documentFragment( this.document );

			cloneId = typeof cloneId == 'undefined' ? true : cloneId;

			if ( !this.collapsed )
				execContentsAction( this, 2, docFrag, false, cloneId );

			return docFrag;
		},

		/**
		 * Deletes the content nodes of the range permanently from the DOM tree.
		 *
		 * @param {Boolean} [mergeThen] Merge any split elements result in DOM true due to partial selection.
		 */
		deleteContents: function( mergeThen ) {
			if ( this.collapsed )
				return;

			execContentsAction( this, 0, null, mergeThen );
		},

		/**
		 * The content nodes of the range are cloned and added to a document fragment,
		 * meanwhile they are removed permanently from the DOM tree.
		 *
		 * **Note:** Setting the `cloneId` parameter to `false` works for **partially** selected elements only.
		 * If an element with an ID attribute is **fully enclosed** in a range, it will keep the ID attribute
		 * regardless of the `cloneId` parameter value, because it is not cloned &mdash; it is moved to the returned
		 * document fragment.
		 *
		 * @param {Boolean} [mergeThen] Merge any split elements result in DOM true due to partial selection.
		 * @param {Boolean} [cloneId=true] Whether to preserve ID attributes in the extracted content.
		 * @returns {CKEDITOR.dom.documentFragment} Document fragment containing extracted content.
		 */
		extractContents: function( mergeThen, cloneId ) {
			var docFrag = new CKEDITOR.dom.documentFragment( this.document );

			cloneId = typeof cloneId == 'undefined' ? true : cloneId;

			if ( !this.collapsed )
				execContentsAction( this, 1, docFrag, mergeThen, cloneId );

			return docFrag;
		},

		/**
		 * Creates a bookmark object, which can be later used to restore the
		 * range by using the {@link #moveToBookmark} function.
		 *
		 * This is an "intrusive" way to create a bookmark. It includes `<span>` tags
		 * in the range boundaries. The advantage of it is that it is possible to
		 * handle DOM mutations when moving back to the bookmark.
		 *
		 * **Note:** The inclusion of nodes in the DOM is a design choice and
		 * should not be changed as there are other points in the code that may be
		 * using those nodes to perform operations.
		 *
		 * @param {Boolean} [serializable] Indicates that the bookmark nodes
		 * must contain IDs, which can be used to restore the range even
		 * when these nodes suffer mutations (like cloning or `innerHTML` change).
		 * @returns {Object} And object representing a bookmark.
		 * @returns {CKEDITOR.dom.node/String} return.startNode Node or element ID.
		 * @returns {CKEDITOR.dom.node/String} return.endNode Node or element ID.
		 * @returns {Boolean} return.serializable
		 * @returns {Boolean} return.collapsed
		 */
		createBookmark: function( serializable ) {
			var startNode, endNode;
			var baseId;
			var clone;
			var collapsed = this.collapsed;

			startNode = this.document.createElement( 'span' );
			startNode.data( 'cke-bookmark', 1 );
			startNode.setStyle( 'display', 'none' );

			// For IE, it must have something inside, otherwise it may be
			// removed during DOM operations.
			startNode.setHtml( '&nbsp;' );

			if ( serializable ) {
				baseId = 'cke_bm_' + CKEDITOR.tools.getNextNumber();
				startNode.setAttribute( 'id', baseId + ( collapsed ? 'C' : 'S' ) );
			}

			// If collapsed, the endNode will not be created.
			if ( !collapsed ) {
				endNode = startNode.clone();
				endNode.setHtml( '&nbsp;' );

				if ( serializable )
					endNode.setAttribute( 'id', baseId + 'E' );

				clone = this.clone();
				clone.collapse();
				clone.insertNode( endNode );
			}

			clone = this.clone();
			clone.collapse( true );
			clone.insertNode( startNode );

			// Update the range position.
			if ( endNode ) {
				this.setStartAfter( startNode );
				this.setEndBefore( endNode );
			} else {
				this.moveToPosition( startNode, CKEDITOR.POSITION_AFTER_END );
			}

			return {
				startNode: serializable ? baseId + ( collapsed ? 'C' : 'S' ) : startNode,
				endNode: serializable ? baseId + 'E' : endNode,
				serializable: serializable,
				collapsed: collapsed
			};
		},

		/**
		 * Creates a "non intrusive" and "mutation sensible" bookmark. This
		 * kind of bookmark should be used only when the DOM is supposed to
		 * remain stable after its creation.
		 *
		 * @param {Boolean} [normalized] Indicates that the bookmark must
		 * be normalized. When normalized, the successive text nodes are
		 * considered a single node. To successfully load a normalized
		 * bookmark, the DOM tree must also be normalized before calling
		 * {@link #moveToBookmark}.
		 * @returns {Object} An object representing the bookmark.
		 * @returns {Array} return.start Start container's address (see {@link CKEDITOR.dom.node#getAddress}).
		 * @returns {Array} return.end Start container's address.
		 * @returns {Number} return.startOffset
		 * @returns {Number} return.endOffset
		 * @returns {Boolean} return.collapsed
		 * @returns {Boolean} return.normalized
		 * @returns {Boolean} return.is2 This is "bookmark2".
		 */
		createBookmark2: ( function() {
			var isNotText = CKEDITOR.dom.walker.nodeType( CKEDITOR.NODE_TEXT, true );

			// Returns true for limit anchored in element and placed between text nodes.
			//
			//               v
			// <p>[text node] [text node]</p> -> true
			//
			//    v
			// <p> [text node]</p> -> false
			//
			//              v
			// <p>[text node][text node]</p> -> false (limit is anchored in text node)
			function betweenTextNodes( container, offset ) {
				// Not anchored in element or limit is on the edge.
				if ( container.type != CKEDITOR.NODE_ELEMENT || offset === 0 || offset == container.getChildCount() )
					return 0;

				return container.getChild( offset - 1 ).type == CKEDITOR.NODE_TEXT &&
					container.getChild( offset ).type == CKEDITOR.NODE_TEXT;
			}

			// Sums lengths of all preceding text nodes.
			function getLengthOfPrecedingTextNodes( node ) {
				var sum = 0;

				while ( ( node = node.getPrevious() ) && node.type == CKEDITOR.NODE_TEXT )
					sum += node.getText().replace( CKEDITOR.dom.selection.FILLING_CHAR_SEQUENCE, '' ).length;

				return sum;
			}

			function normalizeTextNodes( limit ) {
				var container = limit.container,
					offset = limit.offset;

				// If limit is between text nodes move it to the end of preceding one,
				// because they will be merged.
				if ( betweenTextNodes( container, offset ) ) {
					container = container.getChild( offset - 1 );
					offset = container.getLength();
				}

				// Now, if limit is anchored in element and has at least one node before it,
				// it may happen that some of them will be merged. Normalize the offset
				// by setting it to normalized index of its preceding, safe node.
				// (safe == one for which getIndex(true) does not return -1, so one which won't disappear).
				if ( container.type == CKEDITOR.NODE_ELEMENT && offset > 0 ) {
					offset = getPrecedingSafeNodeIndex( container, offset ) + 1;
				}

				// The last step - fix the offset inside text node by adding
				// lengths of preceding text nodes which will be merged with container.
				if ( container.type == CKEDITOR.NODE_TEXT ) {
					var precedingLength = getLengthOfPrecedingTextNodes( container );

					// Normal case - text node is not empty.
					if ( container.getText() ) {
						offset += precedingLength;

					// Awful case - the text node is empty and thus will be totally lost.
					// In this case we are trying to normalize the limit to the left:
					// * either to the preceding text node,
					// * or to the "gap" after the preceding element.
					} else {
						// Find the closest non-text sibling.
						var precedingContainer = container.getPrevious( isNotText );

						// If there are any characters on the left, that means that we can anchor
						// there, because this text node will not be lost.
						if ( precedingLength ) {
							offset = precedingLength;

							if ( precedingContainer ) {
								// The text node is the first node after the closest non-text sibling.
								container = precedingContainer.getNext();
							} else {
								// But if there was no non-text sibling, then the text node is the first child.
								container = container.getParent().getFirst();
							}

						// If there are no characters on the left, then anchor after the previous non-text node.
						// E.g. (see tests for a legend :D):
						// <b>x</b>(foo)({}bar) -> <b>x</b>[](foo)(bar)
						} else {
							container = container.getParent();
							offset = precedingContainer ? ( precedingContainer.getIndex( true ) + 1 ) : 0;
						}
					}
				}

				limit.container = container;
				limit.offset = offset;
			}

			function normalizeFCSeq( limit, root ) {
				var fcseq = root.getCustomData( 'cke-fillingChar' );

				if ( !fcseq ) {
					return;
				}

				var container = limit.container;

				if ( fcseq.equals( container ) ) {
					limit.offset -= CKEDITOR.dom.selection.FILLING_CHAR_SEQUENCE.length;

					// == 0		handles case when limit was at the end of FCS.
					//  < 0		handles all cases where limit was somewhere in the middle or at the beginning.
					//  > 0		(the "else" case) means cases where there are some more characters in the FCS node (FCSabc^def).
					if ( limit.offset <= 0 ) {
						limit.offset = container.getIndex();
						limit.container = container.getParent();
					}
					return;
				}

				// And here goes the funny part - all other cases are handled inside node.getAddress() and getIndex() thanks to
				// node.getIndex() being aware of FCS (handling it as an empty node).
			}

			// Finds a normalized index of a safe node preceding this one.
			// Safe == one that will not disappear, so one for which getIndex( true ) does not return -1.
			// Return -1 if there's no safe preceding node.
			function getPrecedingSafeNodeIndex( container, offset ) {
				var index;

				while ( offset-- ) {
					index = container.getChild( offset ).getIndex( true );

					if ( index >= 0 )
						return index;
				}

				return -1;
			}

			return function( normalized ) {
				var collapsed = this.collapsed,
					bmStart = {
						container: this.startContainer,
						offset: this.startOffset
					},
					bmEnd = {
						container: this.endContainer,
						offset: this.endOffset
					};

				if ( normalized ) {
					normalizeTextNodes( bmStart );
					normalizeFCSeq( bmStart, this.root );

					if ( !collapsed ) {
						normalizeTextNodes( bmEnd );
						normalizeFCSeq( bmEnd, this.root );
					}
				}

				return {
					start: bmStart.container.getAddress( normalized ),
					end: collapsed ? null : bmEnd.container.getAddress( normalized ),
					startOffset: bmStart.offset,
					endOffset: bmEnd.offset,
					normalized: normalized,
					collapsed: collapsed,
					is2: true // It's a createBookmark2 bookmark.
				};
			};
		} )(),

		/**
		 * Moves this range to the given bookmark. See {@link #createBookmark} and {@link #createBookmark2}.
		 *
		 * If serializable bookmark passed, then its `<span>` markers will be removed.
		 *
		 * @param {Object} bookmark
		 */
		moveToBookmark: function( bookmark ) {
			// Created with createBookmark2().
			if ( bookmark.is2 ) {
				// Get the start information.
				var startContainer = this.document.getByAddress( bookmark.start, bookmark.normalized ),
					startOffset = bookmark.startOffset;

				// Get the end information.
				var endContainer = bookmark.end && this.document.getByAddress( bookmark.end, bookmark.normalized ),
					endOffset = bookmark.endOffset;

				// Set the start boundary.
				this.setStart( startContainer, startOffset );

				// Set the end boundary. If not available, collapse it.
				if ( endContainer )
					this.setEnd( endContainer, endOffset );
				else
					this.collapse( true );
			}
			// Created with createBookmark().
			else {
				var serializable = bookmark.serializable,
					startNode = serializable ? this.document.getById( bookmark.startNode ) : bookmark.startNode,
					endNode = serializable ? this.document.getById( bookmark.endNode ) : bookmark.endNode;

				// Set the range start at the bookmark start node position.
				this.setStartBefore( startNode );

				// Remove it, because it may interfere in the setEndBefore call.
				startNode.remove();

				// Set the range end at the bookmark end node position, or simply
				// collapse it if it is not available.
				if ( endNode ) {
					this.setEndBefore( endNode );
					endNode.remove();
				} else {
					this.collapse( true );
				}
			}
		},

		/**
		 * Returns two nodes which are on the boundaries of this range.
		 *
		 * @returns {Object}
		 * @returns {CKEDITOR.dom.node} return.startNode
		 * @returns {CKEDITOR.dom.node} return.endNode
		 * @todo precise desc/algorithm
		 */
		getBoundaryNodes: function() {
			var startNode = this.startContainer,
				endNode = this.endContainer,
				startOffset = this.startOffset,
				endOffset = this.endOffset,
				childCount;

			if ( startNode.type == CKEDITOR.NODE_ELEMENT ) {
				childCount = startNode.getChildCount();
				if ( childCount > startOffset ) {
					startNode = startNode.getChild( startOffset );
				} else if ( childCount < 1 ) {
					startNode = startNode.getPreviousSourceNode();
				}
				// startOffset > childCount but childCount is not 0
				else {
					// Try to take the node just after the current position.
					startNode = startNode.$;
					while ( startNode.lastChild )
						startNode = startNode.lastChild;
					startNode = new CKEDITOR.dom.node( startNode );

					// Normally we should take the next node in DFS order. But it
					// is also possible that we've already reached the end of
					// document.
					startNode = startNode.getNextSourceNode() || startNode;
				}
			}

			if ( endNode.type == CKEDITOR.NODE_ELEMENT ) {
				childCount = endNode.getChildCount();
				if ( childCount > endOffset ) {
					endNode = endNode.getChild( endOffset ).getPreviousSourceNode( true );
				} else if ( childCount < 1 ) {
					endNode = endNode.getPreviousSourceNode();
				}
				// endOffset > childCount but childCount is not 0.
				else {
					// Try to take the node just before the current position.
					endNode = endNode.$;
					while ( endNode.lastChild )
						endNode = endNode.lastChild;
					endNode = new CKEDITOR.dom.node( endNode );
				}
			}

			// Sometimes the endNode will come right before startNode for collapsed
			// ranges. Fix it. (https://dev.ckeditor.com/ticket/3780)
			if ( startNode.getPosition( endNode ) & CKEDITOR.POSITION_FOLLOWING )
				startNode = endNode;

			return { startNode: startNode, endNode: endNode };
		},

		/**
		 * Find the node which fully contains the range.
		 *
		 * @param {Boolean} [includeSelf=false]
		 * @param {Boolean} [ignoreTextNode=false] Whether ignore {@link CKEDITOR#NODE_TEXT} type.
		 * @returns {CKEDITOR.dom.element}
		 */
		getCommonAncestor: function( includeSelf, ignoreTextNode ) {
			var start = this.startContainer,
				end = this.endContainer,
				ancestor;

			if ( start.equals( end ) ) {
				if ( includeSelf && start.type == CKEDITOR.NODE_ELEMENT && this.startOffset == this.endOffset - 1 )
					ancestor = start.getChild( this.startOffset );
				else
					ancestor = start;
			} else {
				ancestor = start.getCommonAncestor( end );
			}

			return ignoreTextNode && !ancestor.is ? ancestor.getParent() : ancestor;
		},

		/**
		 * Transforms the {@link #startContainer} and {@link #endContainer} properties from text
		 * nodes to element nodes, whenever possible. This is actually possible
		 * if either of the boundary containers point to a text node, and its
		 * offset is set to zero, or after the last char in the node.
		 */
		optimize: function() {
			var container = this.startContainer;
			var offset = this.startOffset;

			if ( container.type != CKEDITOR.NODE_ELEMENT ) {
				if ( !offset )
					this.setStartBefore( container );
				else if ( offset >= container.getLength() )
					this.setStartAfter( container );
			}

			container = this.endContainer;
			offset = this.endOffset;

			if ( container.type != CKEDITOR.NODE_ELEMENT ) {
				if ( !offset )
					this.setEndBefore( container );
				else if ( offset >= container.getLength() )
					this.setEndAfter( container );
			}
		},

		/**
		 * Move the range out of bookmark nodes if they'd been the container.
		 */
		optimizeBookmark: function() {
			var startNode = this.startContainer,
				endNode = this.endContainer;

			if ( startNode.is && startNode.is( 'span' ) && startNode.data( 'cke-bookmark' ) )
				this.setStartAt( startNode, CKEDITOR.POSITION_BEFORE_START );
			if ( endNode && endNode.is && endNode.is( 'span' ) && endNode.data( 'cke-bookmark' ) )
				this.setEndAt( endNode, CKEDITOR.POSITION_AFTER_END );
		},

		/**
		 * @param {Boolean} [ignoreStart=false]
		 * @param {Boolean} [ignoreEnd=false]
		 * @todo precise desc/algorithm
		 */
		trim: function( ignoreStart, ignoreEnd ) {
			var startContainer = this.startContainer,
				startOffset = this.startOffset,
				collapsed = this.collapsed;
			if ( ( !ignoreStart || collapsed ) && startContainer && startContainer.type == CKEDITOR.NODE_TEXT ) {
				// If the offset is zero, we just insert the new node before
				// the start.
				if ( !startOffset ) {
					startOffset = startContainer.getIndex();
					startContainer = startContainer.getParent();
				}
				// If the offset is at the end, we'll insert it after the text
				// node.
				else if ( startOffset >= startContainer.getLength() ) {
					startOffset = startContainer.getIndex() + 1;
					startContainer = startContainer.getParent();
				}
				// In other case, we split the text node and insert the new
				// node at the split point.
				else {
					var nextText = startContainer.split( startOffset );

					startOffset = startContainer.getIndex() + 1;
					startContainer = startContainer.getParent();

					// Check all necessity of updating the end boundary.
					if ( this.startContainer.equals( this.endContainer ) )
						this.setEnd( nextText, this.endOffset - this.startOffset );
					else if ( startContainer.equals( this.endContainer ) )
						this.endOffset += 1;
				}

				this.setStart( startContainer, startOffset );

				if ( collapsed ) {
					this.collapse( true );
					return;
				}
			}

			var endContainer = this.endContainer;
			var endOffset = this.endOffset;

			if ( !( ignoreEnd || collapsed ) && endContainer && endContainer.type == CKEDITOR.NODE_TEXT ) {
				// If the offset is zero, we just insert the new node before
				// the start.
				if ( !endOffset ) {
					endOffset = endContainer.getIndex();
					endContainer = endContainer.getParent();
				}
				// If the offset is at the end, we'll insert it after the text
				// node.
				else if ( endOffset >= endContainer.getLength() ) {
					endOffset = endContainer.getIndex() + 1;
					endContainer = endContainer.getParent();
				}
				// In other case, we split the text node and insert the new
				// node at the split point.
				else {
					endContainer.split( endOffset );

					endOffset = endContainer.getIndex() + 1;
					endContainer = endContainer.getParent();
				}

				this.setEnd( endContainer, endOffset );
			}
		},

		/**
		 * Expands the range so that partial units are completely contained.
		 *
		 * @param {Number} unit The unit type to expand with. Use one of following values: {@link CKEDITOR#ENLARGE_BLOCK_CONTENTS},
		 * {@link CKEDITOR#ENLARGE_ELEMENT}, {@link CKEDITOR#ENLARGE_INLINE}, {@link CKEDITOR#ENLARGE_LIST_ITEM_CONTENTS}.
		 * @param {Boolean} [excludeBrs=false] Whether include line-breaks when expanding.
		 */
		enlarge: function( unit, excludeBrs ) {
			var leadingWhitespaceRegex = new RegExp( /[^\s\ufeff]/ );

			switch ( unit ) {
				case CKEDITOR.ENLARGE_INLINE:
					var enlargeInlineOnly = 1;

				/* falls through */
				case CKEDITOR.ENLARGE_ELEMENT:

					if ( this.collapsed )
						return;

					// Get the common ancestor.
					var commonAncestor = this.getCommonAncestor();

					var boundary = this.root;

					// For each boundary
					//		a. Depending on its position, find out the first node to be checked (a sibling) or,
					//			if not available, to be enlarge.
					//		b. Go ahead checking siblings and enlarging the boundary as much as possible until the
					//			common ancestor is not reached. After reaching the common ancestor, just save the
					//			enlargeable node to be used later.

					var startTop, endTop;

					var enlargeable, sibling, commonReached;

					// Indicates that the node can be added only if whitespace
					// is available before it.
					var needsWhiteSpace = false;
					var isWhiteSpace;
					var siblingText;

					// Process the start boundary.

					var container = this.startContainer;
					var offset = this.startOffset;

					if ( container.type == CKEDITOR.NODE_TEXT ) {
						if ( offset ) {
							// Check if there is any non-space text before the
							// offset. Otherwise, container is null.
							container = !CKEDITOR.tools.trim( container.substring( 0, offset ) ).length && container;

							// If we found only whitespace in the node, it
							// means that we'll need more whitespace to be able
							// to expand. For example, <i> can be expanded in
							// "A <i> [B]</i>", but not in "A<i> [B]</i>".
							needsWhiteSpace = !!container;
						}

						if ( container ) {
							if ( !( sibling = container.getPrevious() ) )
								enlargeable = container.getParent();
						}
					} else {
						// If we have offset, get the node preceeding it as the
						// first sibling to be checked.
						if ( offset )
							sibling = container.getChild( offset - 1 ) || container.getLast();

						// If there is no sibling, mark the container to be
						// enlarged.
						if ( !sibling )
							enlargeable = container;
					}

					// Ensures that enlargeable can be indeed enlarged, if not it will be nulled.
					enlargeable = getValidEnlargeable( enlargeable );

					while ( enlargeable || sibling ) {
						if ( enlargeable && !sibling ) {
							// If we reached the common ancestor, mark the flag
							// for it.
							if ( !commonReached && enlargeable.equals( commonAncestor ) )
								commonReached = true;

							if ( enlargeInlineOnly ? enlargeable.isBlockBoundary() : !boundary.contains( enlargeable ) )
								break;

							// If we don't need space or this element breaks
							// the line, then enlarge it.
							if ( !needsWhiteSpace || enlargeable.getComputedStyle( 'display' ) != 'inline' ) {
								needsWhiteSpace = false;

								// If the common ancestor has been reached,
								// we'll not enlarge it immediately, but just
								// mark it to be enlarged later if the end
								// boundary also enlarges it.
								if ( commonReached )
									startTop = enlargeable;
								else
									this.setStartBefore( enlargeable );
							}

							sibling = enlargeable.getPrevious();
						}

						// Check all sibling nodes preceeding the enlargeable
						// node. The node wil lbe enlarged only if none of them
						// blocks it.
						while ( sibling ) {
							// This flag indicates that this node has
							// whitespaces at the end.
							isWhiteSpace = false;

							if ( sibling.type == CKEDITOR.NODE_COMMENT ) {
								sibling = sibling.getPrevious();
								continue;
							} else if ( sibling.type == CKEDITOR.NODE_TEXT ) {
								siblingText = sibling.getText();

								if ( leadingWhitespaceRegex.test( siblingText ) )
									sibling = null;

								isWhiteSpace = /[\s\ufeff]$/.test( siblingText );
							} else {
								// https://dev.ckeditor.com/ticket/12221 (Chrome) plus https://dev.ckeditor.com/ticket/11111 (Safari).
								var offsetWidth0 = CKEDITOR.env.webkit ? 1 : 0;

								// If this is a visible element.
								// We need to check for the bookmark attribute because IE insists on
								// rendering the display:none nodes we use for bookmarks. (https://dev.ckeditor.com/ticket/3363)
								// Line-breaks (br) are rendered with zero width, which we don't want to include. (https://dev.ckeditor.com/ticket/7041)
								if ( ( sibling.$.offsetWidth > offsetWidth0 || excludeBrs && sibling.is( 'br' ) ) && !sibling.data( 'cke-bookmark' ) ) {
									// We'll accept it only if we need
									// whitespace, and this is an inline
									// element with whitespace only.
									if ( needsWhiteSpace && CKEDITOR.dtd.$removeEmpty[ sibling.getName() ] ) {
										// It must contains spaces and inline elements only.

										siblingText = sibling.getText();

										if ( leadingWhitespaceRegex.test( siblingText ) ) // Spaces + Zero Width No-Break Space (U+FEFF)
										sibling = null;
										else {
											var allChildren = sibling.$.getElementsByTagName( '*' );
											for ( var i = 0, child; child = allChildren[ i++ ]; ) {
												if ( !CKEDITOR.dtd.$removeEmpty[ child.nodeName.toLowerCase() ] ) {
													sibling = null;
													break;
												}
											}
										}

										if ( sibling )
											isWhiteSpace = !!siblingText.length;
									} else {
										sibling = null;
									}
								}
							}

							// A node with whitespaces has been found.
							if ( isWhiteSpace ) {
								// Enlarge the last enlargeable node, if we
								// were waiting for spaces.
								if ( needsWhiteSpace ) {
									if ( commonReached )
										startTop = enlargeable;
									else if ( enlargeable )
										this.setStartBefore( enlargeable );
								} else {
									needsWhiteSpace = true;
								}
							}

							if ( sibling ) {
								var next = sibling.getPrevious();

								if ( !enlargeable && !next ) {
									// Set the sibling as enlargeable, so it's
									// parent will be get later outside this while.
									enlargeable = sibling;
									sibling = null;
									break;
								}

								sibling = next;
							} else {
								// If sibling has been set to null, then we
								// need to stop enlarging.
								enlargeable = null;
							}
						}

						if ( enlargeable )
							enlargeable = getValidEnlargeable( enlargeable.getParent() );
					}

					// Process the end boundary. This is basically the same
					// code used for the start boundary, with small changes to
					// make it work in the opposite side (to the right). This
					// makes it difficult to reuse the code here. So, fixes to
					// the above code are likely to be replicated here.

					container = this.endContainer;
					offset = this.endOffset;

					// Reset the common variables.
					enlargeable = sibling = null;
					commonReached = needsWhiteSpace = false;

					// Function check if there are only whitespaces from the given starting point
					// (startContainer and startOffset) till the end on block.
					// Examples ("[" is the start point):
					//  - <p>foo[ </p>           - will return true,
					//  - <p><b>foo[ </b> </p>   - will return true,
					//  - <p>foo[ bar</p>        - will return false,
					//  - <p><b>foo[ </b>bar</p> - will return false,
					//  - <p>foo[ <b></b></p>    - will return false.
					function onlyWhiteSpaces( startContainer, startOffset ) {
						// We need to enlarge range if there is white space at the end of the block,
						// because it is not displayed in WYSIWYG mode and user can not select it. So
						// "<p>foo[bar] </p>" should be changed to "<p>foo[bar ]</p>". On the other hand
						// we should do nothing if we are not at the end of the block, so this should not
						// be changed: "<p><i>[foo] </i>bar</p>".
						var walkerRange = new CKEDITOR.dom.range( boundary );
						walkerRange.setStart( startContainer, startOffset );
						// The guard will find the end of range so I put boundary here.
						walkerRange.setEndAt( boundary, CKEDITOR.POSITION_BEFORE_END );

						var walker = new CKEDITOR.dom.walker( walkerRange ),
							node;

						walker.guard = function( node ) {
							// Stop if you exit block.
							return !( node.type == CKEDITOR.NODE_ELEMENT && node.isBlockBoundary() );
						};

						while ( ( node = walker.next() ) ) {
							if ( node.type != CKEDITOR.NODE_TEXT ) {
								// Stop if you enter to any node (walker.next() will return node only
								// it goes out, not if it is go into node).
								return false;
							} else {
								// Trim the first node to startOffset.
								if ( node != startContainer )
									siblingText = node.getText();
								else
									siblingText = node.substring( startOffset );

								// Check if it is white space.
								if ( leadingWhitespaceRegex.test( siblingText ) )
									return false;
							}
						}

						return true;
					}

					if ( container.type == CKEDITOR.NODE_TEXT ) {
						// Check if there is only white space after the offset.
						if ( CKEDITOR.tools.trim( container.substring( offset ) ).length ) {
							// If we found only whitespace in the node, it
							// means that we'll need more whitespace to be able
							// to expand. For example, <i> can be expanded in
							// "A <i> [B]</i>", but not in "A<i> [B]</i>".
							needsWhiteSpace = true;
						} else {
							needsWhiteSpace = !container.getLength();

							if ( offset == container.getLength() ) {
								// If we are at the end of container and this is the last text node,
								// we should enlarge end to the parent.
								if ( !( sibling = container.getNext() ) )
									enlargeable = container.getParent();
							} else {
								// If we are in the middle on text node and there are only whitespaces
								// till the end of block, we should enlarge element.
								if ( onlyWhiteSpaces( container, offset ) )
									enlargeable = container.getParent();
							}
						}
					} else {
						// Get the node right after the boundary to be checked
						// first.
						sibling = container.getChild( offset );

						if ( !sibling )
							enlargeable = container;
					}

					while ( enlargeable || sibling ) {
						if ( enlargeable && !sibling ) {
							if ( !commonReached && enlargeable.equals( commonAncestor ) )
								commonReached = true;

							if ( enlargeInlineOnly ? enlargeable.isBlockBoundary() : !boundary.contains( enlargeable ) )
								break;

							if ( !needsWhiteSpace || enlargeable.getComputedStyle( 'display' ) != 'inline' ) {
								needsWhiteSpace = false;

								if ( commonReached )
									endTop = enlargeable;
								else if ( enlargeable )
									this.setEndAfter( enlargeable );
							}

							sibling = enlargeable.getNext();
						}

						while ( sibling ) {
							isWhiteSpace = false;

							if ( sibling.type == CKEDITOR.NODE_TEXT ) {
								siblingText = sibling.getText();

								// Check if there are not whitespace characters till the end of editable.
								// If so stop expanding.
								if ( !onlyWhiteSpaces( sibling, 0 ) )
									sibling = null;

								isWhiteSpace = /^[\s\ufeff]/.test( siblingText );
							} else if ( sibling.type == CKEDITOR.NODE_ELEMENT ) {
								// If this is a visible element.
								// We need to check for the bookmark attribute because IE insists on
								// rendering the display:none nodes we use for bookmarks. (https://dev.ckeditor.com/ticket/3363)
								// Line-breaks (br) are rendered with zero width, which we don't want to include. (https://dev.ckeditor.com/ticket/7041)
								if ( ( sibling.$.offsetWidth > 0 || excludeBrs && sibling.is( 'br' ) ) && !sibling.data( 'cke-bookmark' ) ) {
									// We'll accept it only if we need
									// whitespace, and this is an inline
									// element with whitespace only.
									if ( needsWhiteSpace && CKEDITOR.dtd.$removeEmpty[ sibling.getName() ] ) {
										// It must contains spaces and inline elements only.

										siblingText = sibling.getText();

										if ( leadingWhitespaceRegex.test( siblingText ) )
											sibling = null;
										else {
											allChildren = sibling.$.getElementsByTagName( '*' );
											for ( i = 0; child = allChildren[ i++ ]; ) {
												if ( !CKEDITOR.dtd.$removeEmpty[ child.nodeName.toLowerCase() ] ) {
													sibling = null;
													break;
												}
											}
										}

										if ( sibling )
											isWhiteSpace = !!siblingText.length;
									} else {
										sibling = null;
									}
								}
							} else {
								isWhiteSpace = 1;
							}

							if ( isWhiteSpace ) {
								if ( needsWhiteSpace ) {
									if ( commonReached )
										endTop = enlargeable;
									else
										this.setEndAfter( enlargeable );
								}
							}

							if ( sibling ) {
								next = sibling.getNext();

								if ( !enlargeable && !next ) {
									enlargeable = sibling;
									sibling = null;
									break;
								}

								sibling = next;
							} else {
								// If sibling has been set to null, then we
								// need to stop enlarging.
								enlargeable = null;
							}
						}

						if ( enlargeable )
							enlargeable = getValidEnlargeable( enlargeable.getParent() );
					}

					// If the common ancestor can be enlarged by both boundaries, then include it also.
					if ( startTop && endTop ) {
						commonAncestor = startTop.contains( endTop ) ? endTop : startTop;

						this.setStartBefore( commonAncestor );
						this.setEndAfter( commonAncestor );
					}
					break;

				case CKEDITOR.ENLARGE_BLOCK_CONTENTS:
				case CKEDITOR.ENLARGE_LIST_ITEM_CONTENTS:

					// Enlarging the start boundary.
					var walkerRange = new CKEDITOR.dom.range( this.root );

					boundary = this.root;

					walkerRange.setStartAt( boundary, CKEDITOR.POSITION_AFTER_START );
					walkerRange.setEnd( this.startContainer, this.startOffset );

					var walker = new CKEDITOR.dom.walker( walkerRange ),
						blockBoundary, // The node on which the enlarging should stop.
						tailBr, // In case BR as block boundary.
						notBlockBoundary = CKEDITOR.dom.walker.blockBoundary( ( unit == CKEDITOR.ENLARGE_LIST_ITEM_CONTENTS ) ? { br: 1 } : null ),
						inNonEditable = null,
						// Record the encountered 'blockBoundary' for later use.
						boundaryGuard = function( node ) {
							// We should not check contents of non-editable elements. It may happen
							// that inline widget has display:table child which should not block range#enlarge.
							// When encountered non-editable element...
							if ( node.type == CKEDITOR.NODE_ELEMENT && node.getAttribute( 'contenteditable' ) == 'false' ) {
								if ( inNonEditable ) {
									// ... in which we already were, reset it (because we're leaving it) and return.
									if ( inNonEditable.equals( node ) ) {
										inNonEditable = null;
										return;
									}
								// ... which we're entering, remember it but check it (no return).
								} else {
									inNonEditable = node;
								}
							// When we are in non-editable element, do not check if current node is a block boundary.
							} else if ( inNonEditable ) {
								return;
							}

							var retval = notBlockBoundary( node );
							if ( !retval )
								blockBoundary = node;
							return retval;
						},
						// Record the encountered 'tailBr' for later use.
						tailBrGuard = function( node ) {
							var retval = boundaryGuard( node );
							if ( !retval && node.is && node.is( 'br' ) )
								tailBr = node;
							return retval;
						};

					walker.guard = boundaryGuard;

					enlargeable = walker.lastBackward();

					// It's the body which stop the enlarging if no block boundary found.
					blockBoundary = blockBoundary || boundary;

					// Start the range either after the end of found block (<p>...</p>[text)
					// or at the start of block (<p>[text...), by comparing the document position
					// with 'enlargeable' node.
					this.setStartAt( blockBoundary, !blockBoundary.is( 'br' ) && ( !enlargeable && this.checkStartOfBlock() ||
						enlargeable && blockBoundary.contains( enlargeable ) ) ? CKEDITOR.POSITION_AFTER_START : CKEDITOR.POSITION_AFTER_END );

					// Avoid enlarging the range further when end boundary spans right after the BR. (https://dev.ckeditor.com/ticket/7490)
					if ( unit == CKEDITOR.ENLARGE_LIST_ITEM_CONTENTS ) {
						var theRange = this.clone();
						walker = new CKEDITOR.dom.walker( theRange );

						var whitespaces = CKEDITOR.dom.walker.whitespaces(),
							bookmark = CKEDITOR.dom.walker.bookmark();

						walker.evaluator = function( node ) {
							return !whitespaces( node ) && !bookmark( node );
						};
						var previous = walker.previous();
						if ( previous && previous.type == CKEDITOR.NODE_ELEMENT && previous.is( 'br' ) )
							return;
					}

					// Enlarging the end boundary.
					// Set up new range and reset all flags (blockBoundary, inNonEditable, tailBr).

					walkerRange = this.clone();
					walkerRange.collapse();
					walkerRange.setEndAt( boundary, CKEDITOR.POSITION_BEFORE_END );
					walker = new CKEDITOR.dom.walker( walkerRange );

					// tailBrGuard only used for on range end.
					walker.guard = ( unit == CKEDITOR.ENLARGE_LIST_ITEM_CONTENTS ) ? tailBrGuard : boundaryGuard;
					blockBoundary = inNonEditable = tailBr = null;

					// End the range right before the block boundary node.
					enlargeable = walker.lastForward();

					// It's the body which stop the enlarging if no block boundary found.
					blockBoundary = blockBoundary || boundary;

					// Close the range either before the found block start (text]<p>...</p>) or at the block end (...text]</p>)
					// by comparing the document position with 'enlargeable' node.
					this.setEndAt( blockBoundary, ( !enlargeable && this.checkEndOfBlock() ||
						enlargeable && blockBoundary.contains( enlargeable ) ) ? CKEDITOR.POSITION_BEFORE_END : CKEDITOR.POSITION_BEFORE_START );
					// We must include the <br> at the end of range if there's
					// one and we're expanding list item contents
					if ( tailBr ) {
						this.setEndAfter( tailBr );
					}
			}

			// Ensures that returned element can be enlarged by selection, null otherwise.
			// @param {CKEDITOR.dom.element} enlargeable
			// @returns {CKEDITOR.dom.element/null}
			function getValidEnlargeable( enlargeable ) {
				return enlargeable && enlargeable.type == CKEDITOR.NODE_ELEMENT && enlargeable.hasAttribute( 'contenteditable' ) ?
					null : enlargeable;
			}
		},

		/**
		 * Decreases the range to make sure that boundaries
		 * always anchor beside text nodes or the innermost element.
		 *
		 * @param {Number} mode The shrinking mode ({@link CKEDITOR#SHRINK_ELEMENT} or {@link CKEDITOR#SHRINK_TEXT}).
		 *
		 * * {@link CKEDITOR#SHRINK_ELEMENT} &ndash; Shrinks the range boundaries to the edge of the innermost element.
		 * * {@link CKEDITOR#SHRINK_TEXT} &ndash; Shrinks the range boundaries to anchor by the side of enclosed text
		 *     node. The range remains if there are no text nodes available on boundaries.
		 *
		 * @param {Boolean} [selectContents=false] Whether the resulting range anchors at the inner OR outer boundary of the node.
		 * @param {Boolean/Object} [options=true] If this parameter is of a Boolean type, it is treated as
		 * `options.shrinkOnBlockBoundary`. This parameter was added in 4.7.0.
		 * @param {Boolean} [options.shrinkOnBlockBoundary=true] Whether the block boundary should be included in
		 * the shrunk range.
		 * @param {Boolean} [options.skipBogus=false] Whether bogus `<br>` elements should be ignored while
		 * `mode` is set to {@link CKEDITOR#SHRINK_TEXT}. This option was added in 4.7.0.
		 */
		shrink: function( mode, selectContents, options ) {
			var shrinkOnBlockBoundary = typeof options === 'boolean' ? options :
				( options && typeof options.shrinkOnBlockBoundary === 'boolean' ? options.shrinkOnBlockBoundary : true ),
				skipBogus = options && options.skipBogus;

			// Unable to shrink a collapsed range.
			if ( !this.collapsed ) {
				mode = mode || CKEDITOR.SHRINK_TEXT;

				var walkerRange = this.clone();

				var startContainer = this.startContainer,
					endContainer = this.endContainer,
					startOffset = this.startOffset,
					endOffset = this.endOffset;

				// Whether the start/end boundary is moveable.
				var moveStart = 1,
					moveEnd = 1;

				if ( startContainer && startContainer.type == CKEDITOR.NODE_TEXT ) {
					if ( !startOffset )
						walkerRange.setStartBefore( startContainer );
					else if ( startOffset >= startContainer.getLength() )
						walkerRange.setStartAfter( startContainer );
					else {
						// Enlarge the range properly to avoid walker making
						// DOM changes caused by trimming the text nodes later.
						walkerRange.setStartBefore( startContainer );
						moveStart = 0;
					}
				}

				if ( endContainer && endContainer.type == CKEDITOR.NODE_TEXT ) {
					if ( !endOffset )
						walkerRange.setEndBefore( endContainer );
					else if ( endOffset >= endContainer.getLength() )
						walkerRange.setEndAfter( endContainer );
					else {
						walkerRange.setEndAfter( endContainer );
						moveEnd = 0;
					}
				}

				var walker = new CKEDITOR.dom.walker( walkerRange ),
					isBookmark = CKEDITOR.dom.walker.bookmark(),
					isBogus = CKEDITOR.dom.walker.bogus();

				walker.evaluator = function( node ) {
					return node.type == ( mode == CKEDITOR.SHRINK_ELEMENT ? CKEDITOR.NODE_ELEMENT : CKEDITOR.NODE_TEXT );
				};

				var currentElement;
				walker.guard = function( node, movingOut ) {
					// Skipping bogus before other cases (https://dev.ckeditor.com/ticket/17010).
					if ( skipBogus && isBogus( node ) ) {
						return true;
					}

					if ( isBookmark( node ) )
						return true;

					// Stop when we're shrink in element mode while encountering a text node.
					if ( mode == CKEDITOR.SHRINK_ELEMENT && node.type == CKEDITOR.NODE_TEXT )
						return false;

					// Stop when we've already walked "through" an element.
					if ( movingOut && node.equals( currentElement ) )
						return false;

					if ( shrinkOnBlockBoundary === false && node.type == CKEDITOR.NODE_ELEMENT && node.isBlockBoundary() )
						return false;

					// Stop shrinking when encountering an editable border.
					if ( node.type == CKEDITOR.NODE_ELEMENT && node.hasAttribute( 'contenteditable' ) )
						return false;

					if ( !movingOut && node.type == CKEDITOR.NODE_ELEMENT )
						currentElement = node;

					return true;
				};

				if ( moveStart ) {
					var textStart = walker[ mode == CKEDITOR.SHRINK_ELEMENT ? 'lastForward' : 'next' ]();
					textStart && this.setStartAt( textStart, selectContents ? CKEDITOR.POSITION_AFTER_START : CKEDITOR.POSITION_BEFORE_START );
				}

				if ( moveEnd ) {
					walker.reset();
					var textEnd = walker[ mode == CKEDITOR.SHRINK_ELEMENT ? 'lastBackward' : 'previous' ]();
					textEnd && this.setEndAt( textEnd, selectContents ? CKEDITOR.POSITION_BEFORE_END : CKEDITOR.POSITION_AFTER_END );
				}

				return !!( moveStart || moveEnd );
			}
		},

		/**
		 * Inserts a node at the start of the range. The range will be expanded
		 * to contain the node.
		 *
		 * @param {CKEDITOR.dom.node} node
		 */
		insertNode: function( node ) {
			this.optimizeBookmark();
			this.trim( false, true );

			var startContainer = this.startContainer;
			var startOffset = this.startOffset;

			var nextNode = startContainer.getChild( startOffset );

			if ( nextNode )
				node.insertBefore( nextNode );
			else
				startContainer.append( node );

			// Check if we need to update the end boundary.
			if ( node.getParent() && node.getParent().equals( this.endContainer ) )
				this.endOffset++;

			// Expand the range to embrace the new node.
			this.setStartBefore( node );
		},

		/**
		 * Moves the range to a given position according to the specified node.
		 *
		 *		// HTML: <p>Foo <b>bar</b></p>
		 *		range.moveToPosition( elB, CKEDITOR.POSITION_BEFORE_START );
		 *		// Range will be moved to: <p>Foo ^<b>bar</b></p>
		 *
		 * See also {@link #setStartAt} and {@link #setEndAt}.
		 *
		 * @param {CKEDITOR.dom.node} node The node according to which the position will be set.
		 * @param {Number} position One of {@link CKEDITOR#POSITION_BEFORE_START},
		 * {@link CKEDITOR#POSITION_AFTER_START}, {@link CKEDITOR#POSITION_BEFORE_END},
		 * {@link CKEDITOR#POSITION_AFTER_END}.
		 */
		moveToPosition: function( node, position ) {
			this.setStartAt( node, position );
			this.collapse( true );
		},

		/**
		 * Moves the range to the exact position of the specified range.
		 *
		 * @param {CKEDITOR.dom.range} range
		 */
		moveToRange: function( range ) {
			this.setStart( range.startContainer, range.startOffset );
			this.setEnd( range.endContainer, range.endOffset );
		},

		/**
		 * Select nodes content. Range will start and end inside this node.
		 *
		 * @param {CKEDITOR.dom.node} node
		 */
		selectNodeContents: function( node ) {
			this.setStart( node, 0 );
			this.setEnd( node, node.type == CKEDITOR.NODE_TEXT ? node.getLength() : node.getChildCount() );
		},

		/**
		 * Sets the start position of a range.
		 *
		 * @param {CKEDITOR.dom.node} startNode The node to start the range.
		 * @param {Number} startOffset An integer greater than or equal to zero
		 * representing the offset for the start of the range from the start
		 * of `startNode`.
		 */
		setStart: function( startNode, startOffset ) {
			// W3C requires a check for the new position. If it is after the end
			// boundary, the range should be collapsed to the new start. It seams
			// we will not need this check for our use of this class so we can
			// ignore it for now.

			// Fixing invalid range start inside dtd empty elements.
			if ( startNode.type == CKEDITOR.NODE_ELEMENT && CKEDITOR.dtd.$empty[ startNode.getName() ] )
				startOffset = startNode.getIndex(), startNode = startNode.getParent();

			this._setStartContainer( startNode );
			this.startOffset = startOffset;

			if ( !this.endContainer ) {
				this._setEndContainer( startNode );
				this.endOffset = startOffset;
			}

			updateCollapsed( this );
		},

		/**
		 * Sets the end position of a Range.
		 *
		 * @param {CKEDITOR.dom.node} endNode The node to end the range.
		 * @param {Number} endOffset An integer greater than or equal to zero
		 * representing the offset for the end of the range from the start
		 * of `endNode`.
		 */
		setEnd: function( endNode, endOffset ) {
			// W3C requires a check for the new position. If it is before the start
			// boundary, the range should be collapsed to the new end. It seams we
			// will not need this check for our use of this class so we can ignore
			// it for now.

			// Fixing invalid range end inside dtd empty elements.
			if ( endNode.type == CKEDITOR.NODE_ELEMENT && CKEDITOR.dtd.$empty[ endNode.getName() ] )
				endOffset = endNode.getIndex() + 1, endNode = endNode.getParent();

			this._setEndContainer( endNode );
			this.endOffset = endOffset;

			if ( !this.startContainer ) {
				this._setStartContainer( endNode );
				this.startOffset = endOffset;
			}

			updateCollapsed( this );
		},

		/**
		 * Sets start of this range after the specified node.
		 *
		 *		// Range: <p>foo<b>bar</b>^</p>
		 *		range.setStartAfter( textFoo );
		 *		// The range will be changed to:
		 *		// <p>foo[<b>bar</b>]</p>
		 *
		 * @param {CKEDITOR.dom.node} node
		 */
		setStartAfter: function( node ) {
			this.setStart( node.getParent(), node.getIndex() + 1 );
		},

		/**
		 * Sets start of this range after the specified node.
		 *
		 *		// Range: <p>foo<b>bar</b>^</p>
		 *		range.setStartBefore( elB );
		 *		// The range will be changed to:
		 *		// <p>foo[<b>bar</b>]</p>
		 *
		 * @param {CKEDITOR.dom.node} node
		 */
		setStartBefore: function( node ) {
			this.setStart( node.getParent(), node.getIndex() );
		},

		/**
		 * Sets end of this range after the specified node.
		 *
		 *		// Range: <p>foo^<b>bar</b></p>
		 *		range.setEndAfter( elB );
		 *		// The range will be changed to:
		 *		// <p>foo[<b>bar</b>]</p>
		 *
		 * @param {CKEDITOR.dom.node} node
		 */
		setEndAfter: function( node ) {
			this.setEnd( node.getParent(), node.getIndex() + 1 );
		},

		/**
		 * Sets end of this range before the specified node.
		 *
		 *		// Range: <p>^foo<b>bar</b></p>
		 *		range.setStartAfter( textBar );
		 *		// The range will be changed to:
		 *		// <p>[foo<b>]bar</b></p>
		 *
		 * @param {CKEDITOR.dom.node} node
		 */
		setEndBefore: function( node ) {
			this.setEnd( node.getParent(), node.getIndex() );
		},

		/**
		 * Moves the start of this range to given position according to specified node.
		 *
		 *		// HTML: <p>Foo <b>bar</b>^</p>
		 *		range.setStartAt( elB, CKEDITOR.POSITION_AFTER_START );
		 *		// The range will be changed to:
		 *		// <p>Foo <b>[bar</b>]</p>
		 *
		 * See also {@link #setEndAt} and {@link #moveToPosition}.
		 *
		 * @param {CKEDITOR.dom.node} node The node according to which position will be set.
		 * @param {Number} position One of {@link CKEDITOR#POSITION_BEFORE_START},
		 * {@link CKEDITOR#POSITION_AFTER_START}, {@link CKEDITOR#POSITION_BEFORE_END},
		 * {@link CKEDITOR#POSITION_AFTER_END}.
		 */
		setStartAt: function( node, position ) {
			switch ( position ) {
				case CKEDITOR.POSITION_AFTER_START:
					this.setStart( node, 0 );
					break;

				case CKEDITOR.POSITION_BEFORE_END:
					if ( node.type == CKEDITOR.NODE_TEXT )
						this.setStart( node, node.getLength() );
					else
						this.setStart( node, node.getChildCount() );
					break;

				case CKEDITOR.POSITION_BEFORE_START:
					this.setStartBefore( node );
					break;

				case CKEDITOR.POSITION_AFTER_END:
					this.setStartAfter( node );
			}

			updateCollapsed( this );
		},

		/**
		 * Moves the end of this range to given position according to specified node.
		 *
		 *		// HTML: <p>^Foo <b>bar</b></p>
		 *		range.setEndAt( textBar, CKEDITOR.POSITION_BEFORE_START );
		 *		// The range will be changed to:
		 *		// <p>[Foo <b>]bar</b></p>
		 *
		 * See also {@link #setStartAt} and {@link #moveToPosition}.
		 *
		 * @param {CKEDITOR.dom.node} node The node according to which position will be set.
		 * @param {Number} position One of {@link CKEDITOR#POSITION_BEFORE_START},
		 * {@link CKEDITOR#POSITION_AFTER_START}, {@link CKEDITOR#POSITION_BEFORE_END},
		 * {@link CKEDITOR#POSITION_AFTER_END}.
		 */
		setEndAt: function( node, position ) {
			switch ( position ) {
				case CKEDITOR.POSITION_AFTER_START:
					this.setEnd( node, 0 );
					break;

				case CKEDITOR.POSITION_BEFORE_END:
					if ( node.type == CKEDITOR.NODE_TEXT )
						this.setEnd( node, node.getLength() );
					else
						this.setEnd( node, node.getChildCount() );
					break;

				case CKEDITOR.POSITION_BEFORE_START:
					this.setEndBefore( node );
					break;

				case CKEDITOR.POSITION_AFTER_END:
					this.setEndAfter( node );
			}

			updateCollapsed( this );
		},

		/**
		 * Wraps inline content found around the range's start or end boundary
		 * with a block element.
		 *
		 *		// Assuming the following range:
		 *		// <h1>foo</h1>ba^r<br />bom<p>foo</p>
		 *		// The result of executing:
		 *		range.fixBlock( true, 'p' );
		 *		// will be:
		 *		// <h1>foo</h1><p>ba^r<br />bom</p><p>foo</p>
		 *
		 * Non-collapsed range:
		 *
		 *		// Assuming the following range:
		 *		// ba[r<p>foo</p>bo]m
		 *		// The result of executing:
		 *		range.fixBlock( false, 'p' );
		 *		// will be:
		 *		// ba[r<p>foo</p><p>bo]m</p>
		 *
		 * @param {Boolean} isStart Whether the start or end boundary of a range should be checked.
		 * @param {String} blockTag The name of a block element in which content will be wrapped.
		 * For example: `'p'`.
		 * @returns {CKEDITOR.dom.element} Created block wrapper.
		 */
		fixBlock: function( isStart, blockTag ) {
			var bookmark = this.createBookmark(),
				fixedBlock = this.document.createElement( blockTag );

			this.collapse( isStart );

			this.enlarge( CKEDITOR.ENLARGE_BLOCK_CONTENTS );

			this.extractContents().appendTo( fixedBlock );
			fixedBlock.trim();

			this.insertNode( fixedBlock );

			// Bogus <br> could already exist in the range's container before fixBlock() was called. In such case it was
			// extracted and appended to the fixBlock. However, we are not sure that it's at the end of
			// the fixedBlock, because of FF's terrible bug. When creating a bookmark in an empty editable
			// FF moves the bogus <br> before that bookmark (<editable><br /><bm />[]</editable>).
			// So even if the initial range was placed before the bogus <br>, after creating the bookmark it
			// is placed before the bookmark.
			// Fortunately, getBogus() is able to skip the bookmark so it finds the bogus <br> in this case.
			// We remove incorrectly placed one and add a brand new one. (https://dev.ckeditor.com/ticket/13001)
			var bogus = fixedBlock.getBogus();
			if ( bogus ) {
				bogus.remove();
			}
			fixedBlock.appendBogus();

			this.moveToBookmark( bookmark );

			return fixedBlock;
		},

		/**
		 * @todo
		 * @param {Boolean} [cloneId=false] Whether to preserve ID attributes in the result blocks.
		 */
		splitBlock: function( blockTag, cloneId ) {
			var startPath = new CKEDITOR.dom.elementPath( this.startContainer, this.root ),
				endPath = new CKEDITOR.dom.elementPath( this.endContainer, this.root );

			var startBlockLimit = startPath.blockLimit,
				endBlockLimit = endPath.blockLimit;

			var startBlock = startPath.block,
				endBlock = endPath.block;

			var elementPath = null;
			// Do nothing if the boundaries are in different block limits.
			if ( !startBlockLimit.equals( endBlockLimit ) )
				return null;

			// Get or fix current blocks.
			if ( blockTag != 'br' ) {
				if ( !startBlock ) {
					startBlock = this.fixBlock( true, blockTag );
					endBlock = new CKEDITOR.dom.elementPath( this.endContainer, this.root ).block;
				}

				if ( !endBlock )
					endBlock = this.fixBlock( false, blockTag );
			}

			// Get the range position.
			var isStartOfBlock = startBlock && this.checkStartOfBlock(),
				isEndOfBlock = endBlock && this.checkEndOfBlock();

			// Delete the current contents.
			// TODO: Why is 2.x doing CheckIsEmpty()?
			this.deleteContents();

			if ( startBlock && startBlock.equals( endBlock ) ) {
				if ( isEndOfBlock ) {
					elementPath = new CKEDITOR.dom.elementPath( this.startContainer, this.root );
					this.moveToPosition( endBlock, CKEDITOR.POSITION_AFTER_END );
					endBlock = null;
				} else if ( isStartOfBlock ) {
					elementPath = new CKEDITOR.dom.elementPath( this.startContainer, this.root );
					this.moveToPosition( startBlock, CKEDITOR.POSITION_BEFORE_START );
					startBlock = null;
				} else {
					endBlock = this.splitElement( startBlock, cloneId || false );

					// In Gecko, the last child node must be a bogus <br>.
					// Note: bogus <br> added under <ul> or <ol> would cause
					// lists to be incorrectly rendered.
					if ( !startBlock.is( 'ul', 'ol' ) )
						startBlock.appendBogus();
				}
			}

			return {
				previousBlock: startBlock,
				nextBlock: endBlock,
				wasStartOfBlock: isStartOfBlock,
				wasEndOfBlock: isEndOfBlock,
				elementPath: elementPath
			};
		},

		/**
		 * Branch the specified element from the collapsed range position and
		 * place the caret between the two result branches.
		 *
		 * **Note:** The range must be collapsed and been enclosed by this element.
		 *
		 * @param {CKEDITOR.dom.element} element
		 * @param {Boolean} [cloneId=false] Whether to preserve ID attributes in the result elements.
		 * @returns {CKEDITOR.dom.element} Root element of the new branch after the split.
		 */
		splitElement: function( toSplit, cloneId ) {
			if ( !this.collapsed )
				return null;

			// Extract the contents of the block from the selection point to the end
			// of its contents.
			this.setEndAt( toSplit, CKEDITOR.POSITION_BEFORE_END );
			var documentFragment = this.extractContents( false, cloneId || false );

			// Duplicate the element after it.
			var clone = toSplit.clone( false, cloneId || false );

			// Place the extracted contents into the duplicated element.
			documentFragment.appendTo( clone );
			clone.insertAfter( toSplit );
			this.moveToPosition( toSplit, CKEDITOR.POSITION_AFTER_END );
			return clone;
		},

		/**
		 * Recursively remove any empty path blocks at the range boundary.
		 *
		 * @method
		 * @param {Boolean} atEnd Removal to perform at the end boundary,
		 * otherwise to perform at the start.
		 */
		removeEmptyBlocksAtEnd: ( function() {

			var whitespace = CKEDITOR.dom.walker.whitespaces(),
					bookmark = CKEDITOR.dom.walker.bookmark( false );

			function childEval( parent ) {
				return function( node ) {
					// Whitespace, bookmarks, empty inlines.
					if ( whitespace( node ) || bookmark( node ) ||
							node.type == CKEDITOR.NODE_ELEMENT &&
							node.isEmptyInlineRemoveable() ) {
						return false;
					} else if ( parent.is( 'table' ) && node.is( 'caption' ) ) {
						return false;
					}

					return true;
				};
			}

			return function( atEnd ) {

				var bm = this.createBookmark();
				var path = this[ atEnd ? 'endPath' : 'startPath' ]();
				var block = path.block || path.blockLimit, parent;

				// Remove any childless block, including list and table.
				while ( block && !block.equals( path.root ) &&
						!block.getFirst( childEval( block ) ) ) {
					parent = block.getParent();
					this[ atEnd ? 'setEndAt' : 'setStartAt' ]( block, CKEDITOR.POSITION_AFTER_END );
					block.remove( 1 );
					block = parent;
				}

				this.moveToBookmark( bm );
			};

		} )(),

		/**
		 * Gets {@link CKEDITOR.dom.elementPath} for the {@link #startContainer}.
		 *
		 * @returns {CKEDITOR.dom.elementPath}
		 */
		startPath: function() {
			return new CKEDITOR.dom.elementPath( this.startContainer, this.root );
		},

		/**
		 * Gets {@link CKEDITOR.dom.elementPath} for the {@link #endContainer}.
		 *
		 * @returns {CKEDITOR.dom.elementPath}
		 */
		endPath: function() {
			return new CKEDITOR.dom.elementPath( this.endContainer, this.root );
		},

		/**
		 * Check whether a range boundary is at the inner boundary of a given
		 * element.
		 *
		 * @param {CKEDITOR.dom.element} element The target element to check.
		 * @param {Number} checkType The boundary to check for both the range
		 * and the element. It can be {@link CKEDITOR#START} or {@link CKEDITOR#END}.
		 * @returns {Boolean} `true` if the range boundary is at the inner
		 * boundary of the element.
		 */
		checkBoundaryOfElement: function( element, checkType ) {
			var checkStart = ( checkType == CKEDITOR.START );

			// Create a copy of this range, so we can manipulate it for our checks.
			var walkerRange = this.clone();

			// Collapse the range at the proper size.
			walkerRange.collapse( checkStart );

			// Expand the range to element boundary.
			walkerRange[ checkStart ? 'setStartAt' : 'setEndAt' ]( element, checkStart ? CKEDITOR.POSITION_AFTER_START : CKEDITOR.POSITION_BEFORE_END );

			// Create the walker, which will check if we have anything useful
			// in the range.
			var walker = new CKEDITOR.dom.walker( walkerRange );
			walker.evaluator = elementBoundaryEval( checkStart );

			return walker[ checkStart ? 'checkBackward' : 'checkForward' ]();
		},

		/**
		 * **Note:** Calls to this function may produce changes to the DOM. The range may
		 * be updated to reflect such changes.
		 *
		 * @returns {Boolean}
		 * @todo
		 */
		checkStartOfBlock: function() {
			var startContainer = this.startContainer,
				startOffset = this.startOffset;

			// [IE] Special handling for range start in text with a leading NBSP,
			// we it to be isolated, for bogus check.
			if ( CKEDITOR.env.ie && startOffset && startContainer.type == CKEDITOR.NODE_TEXT ) {
				var textBefore = CKEDITOR.tools.ltrim( startContainer.substring( 0, startOffset ) );
				if ( nbspRegExp.test( textBefore ) )
					this.trim( 0, 1 );
			}

			// Anticipate the trim() call here, so the walker will not make
			// changes to the DOM, which would not get reflected into this
			// range otherwise.
			this.trim();

			// We need to grab the block element holding the start boundary, so
			// let's use an element path for it.
			var path = new CKEDITOR.dom.elementPath( this.startContainer, this.root );

			// Creates a range starting at the block start until the range start.
			var walkerRange = this.clone();
			walkerRange.collapse( true );
			walkerRange.setStartAt( path.block || path.blockLimit, CKEDITOR.POSITION_AFTER_START );

			var walker = new CKEDITOR.dom.walker( walkerRange );
			walker.evaluator = getCheckStartEndBlockEvalFunction();

			return walker.checkBackward();
		},

		/**
		 * **Note:** Calls to this function may produce changes to the DOM. The range may
		 * be updated to reflect such changes.
		 *
		 * @returns {Boolean}
		 * @todo
		 */
		checkEndOfBlock: function() {
			var endContainer = this.endContainer,
				endOffset = this.endOffset;

			// [IE] Special handling for range end in text with a following NBSP,
			// we it to be isolated, for bogus check.
			if ( CKEDITOR.env.ie && endContainer.type == CKEDITOR.NODE_TEXT ) {
				var textAfter = CKEDITOR.tools.rtrim( endContainer.substring( endOffset ) );
				if ( nbspRegExp.test( textAfter ) )
					this.trim( 1, 0 );
			}

			// Anticipate the trim() call here, so the walker will not make
			// changes to the DOM, which would not get reflected into this
			// range otherwise.
			this.trim();

			// We need to grab the block element holding the start boundary, so
			// let's use an element path for it.
			var path = new CKEDITOR.dom.elementPath( this.endContainer, this.root );

			// Creates a range starting at the block start until the range start.
			var walkerRange = this.clone();
			walkerRange.collapse( false );
			walkerRange.setEndAt( path.block || path.blockLimit, CKEDITOR.POSITION_BEFORE_END );

			var walker = new CKEDITOR.dom.walker( walkerRange );
			walker.evaluator = getCheckStartEndBlockEvalFunction();

			return walker.checkForward();
		},

		/**
		 * Traverse with {@link CKEDITOR.dom.walker} to retrieve the previous element before the range start.
		 *
		 * @param {Function} evaluator Function used as the walker's evaluator.
		 * @param {Function} [guard] Function used as the walker's guard.
		 * @param {CKEDITOR.dom.element} [boundary] A range ancestor element in which the traversal is limited,
		 * default to the root editable if not defined.
		 * @returns {CKEDITOR.dom.element/null} The returned node from the traversal.
		 */
		getPreviousNode: function( evaluator, guard, boundary ) {
			var walkerRange = this.clone();
			walkerRange.collapse( 1 );
			walkerRange.setStartAt( boundary || this.root, CKEDITOR.POSITION_AFTER_START );

			var walker = new CKEDITOR.dom.walker( walkerRange );
			walker.evaluator = evaluator;
			walker.guard = guard;
			return walker.previous();
		},

		/**
		 * Traverse with {@link CKEDITOR.dom.walker} to retrieve the next element before the range start.
		 *
		 * @param {Function} evaluator Function used as the walker's evaluator.
		 * @param {Function} [guard] Function used as the walker's guard.
		 * @param {CKEDITOR.dom.element} [boundary] A range ancestor element in which the traversal is limited,
		 * default to the root editable if not defined.
		 * @returns {CKEDITOR.dom.element/null} The returned node from the traversal.
		 */
		getNextNode: function( evaluator, guard, boundary ) {
			var walkerRange = this.clone();
			walkerRange.collapse();
			walkerRange.setEndAt( boundary || this.root, CKEDITOR.POSITION_BEFORE_END );

			var walker = new CKEDITOR.dom.walker( walkerRange );
			walker.evaluator = evaluator;
			walker.guard = guard;
			return walker.next();
		},

		/**
		 * Check if elements at which the range boundaries anchor are read-only,
		 * with respect to `contenteditable` attribute.
		 *
		 * @returns {Boolean}
		 */
		checkReadOnly: ( function() {
			function checkNodesEditable( node, anotherEnd ) {
				while ( node ) {
					if ( node.type == CKEDITOR.NODE_ELEMENT ) {
						if ( node.getAttribute( 'contentEditable' ) == 'false' && !node.data( 'cke-editable' ) )
							return 0;

						// Range enclosed entirely in an editable element.
						else if ( node.is( 'html' ) || node.getAttribute( 'contentEditable' ) == 'true' && ( node.contains( anotherEnd ) || node.equals( anotherEnd ) ) )
							break;

					}
					node = node.getParent();
				}

				return 1;
			}

			return function() {
				var startNode = this.startContainer,
					endNode = this.endContainer;

				// Check if elements path at both boundaries are editable.
				return !( checkNodesEditable( startNode, endNode ) && checkNodesEditable( endNode, startNode ) );
			};
		} )(),

		/**
		 * Moves the range boundaries to the first/end editing point inside an
		 * element.
		 *
		 * For example, in an element tree like
		 * `<p><b><i></i></b> Text</p>`, the start editing point is
		 * `<p><b><i>^</i></b> Text</p>` (inside `<i>`).
		 *
		 * @param {CKEDITOR.dom.element} el The element into which look for the
		 * editing spot.
		 * @param {Boolean} isMoveToEnd Whether move to the end editable position.
		 * @returns {Boolean} Whether range was moved.
		 */
		moveToElementEditablePosition: function( el, isMoveToEnd ) {

			function nextDFS( node, childOnly ) {
				var next;

				if ( node.type == CKEDITOR.NODE_ELEMENT && node.isEditable( false ) )
					next = node[ isMoveToEnd ? 'getLast' : 'getFirst' ]( notIgnoredEval );

				if ( !childOnly && !next )
					next = node[ isMoveToEnd ? 'getPrevious' : 'getNext' ]( notIgnoredEval );

				return next;
			}

			// Handle non-editable element e.g. HR.
			if ( el.type == CKEDITOR.NODE_ELEMENT && !el.isEditable( false ) ) {
				this.moveToPosition( el, isMoveToEnd ? CKEDITOR.POSITION_AFTER_END : CKEDITOR.POSITION_BEFORE_START );
				return true;
			}

			var found = 0;

			while ( el ) {
				// Stop immediately if we've found a text node.
				if ( el.type == CKEDITOR.NODE_TEXT ) {
					// Put cursor before block filler.
					if ( isMoveToEnd && this.endContainer && this.checkEndOfBlock() && nbspRegExp.test( el.getText() ) )
						this.moveToPosition( el, CKEDITOR.POSITION_BEFORE_START );
					else
						this.moveToPosition( el, isMoveToEnd ? CKEDITOR.POSITION_AFTER_END : CKEDITOR.POSITION_BEFORE_START );
					found = 1;
					break;
				}

				// If an editable element is found, move inside it, but not stop the searching.
				if ( el.type == CKEDITOR.NODE_ELEMENT ) {
					if ( el.isEditable() ) {
						this.moveToPosition( el, isMoveToEnd ? CKEDITOR.POSITION_BEFORE_END : CKEDITOR.POSITION_AFTER_START );
						found = 1;
					}
					// Put cursor before padding block br.
					else if ( isMoveToEnd && el.is( 'br' ) && this.endContainer && this.checkEndOfBlock() )
						this.moveToPosition( el, CKEDITOR.POSITION_BEFORE_START );
					// Special case - non-editable block. Select entire element, because it does not make sense
					// to place collapsed selection next to it, because browsers can't handle that.
					else if ( el.getAttribute( 'contenteditable' ) == 'false' && el.is( CKEDITOR.dtd.$block ) ) {
						this.setStartBefore( el );
						this.setEndAfter( el );
						return true;
					}
				}

				el = nextDFS( el, found );
			}

			return !!found;
		},

		/**
		 * Moves the range boundaries to the closest editing point after/before an
		 * element or the current range position (depends on whether the element was specified).
		 *
		 * For example, if the start element has `id="start"`,
		 * `<p><b>foo</b><span id="start">start</start></p>`, the closest previous editing point is
		 * `<p><b>foo</b>^<span id="start">start</start></p>` (between `<b>` and `<span>`).
		 *
		 * See also: {@link #moveToElementEditablePosition}.
		 *
		 * @since 4.3.0
		 * @param {CKEDITOR.dom.element} [element] The starting element. If not specified, the current range
		 * position will be used.
		 * @param {Boolean} [isMoveForward] Whether move to the end of editable. Otherwise, look back.
		 * @returns {Boolean} Whether the range was moved.
		 */
		moveToClosestEditablePosition: function( element, isMoveForward ) {
			// We don't want to modify original range if there's no editable position.
			var range,
				found = 0,
				sibling,
				isElement,
				positions = [ CKEDITOR.POSITION_AFTER_END, CKEDITOR.POSITION_BEFORE_START ];

			if ( element ) {
				// Set collapsed range at one of ends of element.
				// Can't clone this range, because this range might not be yet positioned (no containers => errors).
				range = new CKEDITOR.dom.range( this.root );
				range.moveToPosition( element, positions[ isMoveForward ? 0 : 1 ] );
			} else {
				range = this.clone();
			}

			// Start element isn't a block, so we can automatically place range
			// next to it.
			if ( element && !element.is( CKEDITOR.dtd.$block ) )
				found = 1;
			else {
				// Look for first node that fulfills eval function and place range next to it.
				sibling = range[ isMoveForward ? 'getNextEditableNode' : 'getPreviousEditableNode' ]();
				if ( sibling ) {
					found = 1;
					isElement = sibling.type == CKEDITOR.NODE_ELEMENT;

					// Special case - eval accepts block element only if it's a non-editable block,
					// which we want to select, not place collapsed selection next to it (which browsers
					// can't handle).
					if ( isElement && sibling.is( CKEDITOR.dtd.$block ) && sibling.getAttribute( 'contenteditable' ) == 'false' ) {
						range.setStartAt( sibling, CKEDITOR.POSITION_BEFORE_START );
						range.setEndAt( sibling, CKEDITOR.POSITION_AFTER_END );
					}
					// Handle empty blocks which can be selection containers on old IEs.
					else if ( !CKEDITOR.env.needsBrFiller && isElement && sibling.is( CKEDITOR.dom.walker.validEmptyBlockContainers ) ) {
						range.setEnd( sibling, 0 );
						range.collapse();
					} else {
						range.moveToPosition( sibling, positions[ isMoveForward ? 1 : 0 ] );
					}
				}
			}

			if ( found )
				this.moveToRange( range );

			return !!found;
		},

		/**
		 * See {@link #moveToElementEditablePosition}.
		 *
		 * @returns {Boolean} Whether range was moved.
		 */
		moveToElementEditStart: function( target ) {
			return this.moveToElementEditablePosition( target );
		},

		/**
		 * See {@link #moveToElementEditablePosition}.
		 *
		 * @returns {Boolean} Whether range was moved.
		 */
		moveToElementEditEnd: function( target ) {
			return this.moveToElementEditablePosition( target, true );
		},

		/**
		 * Get the single node enclosed within the range if there's one.
		 *
		 * @returns {CKEDITOR.dom.node}
		 */
		getEnclosedNode: function() {
			var walkerRange = this.clone();

			// Optimize and analyze the range to avoid DOM destructive nature of walker. (https://dev.ckeditor.com/ticket/5780)
			walkerRange.optimize();
			if ( walkerRange.startContainer.type != CKEDITOR.NODE_ELEMENT || walkerRange.endContainer.type != CKEDITOR.NODE_ELEMENT )
				return null;

			var walker = new CKEDITOR.dom.walker( walkerRange ),
				isNotBookmarks = CKEDITOR.dom.walker.bookmark( false, true ),
				isNotWhitespaces = CKEDITOR.dom.walker.whitespaces( true );

			walker.evaluator = function( node ) {
				return isNotWhitespaces( node ) && isNotBookmarks( node );
			};
			var node = walker.next();
			walker.reset();
			return node && node.equals( walker.previous() ) ? node : null;
		},

		/**
		 * Get the node adjacent to the range start or {@link #startContainer}.
		 *
		 * @returns {CKEDITOR.dom.node}
		 */
		getTouchedStartNode: function() {
			var container = this.startContainer;

			if ( this.collapsed || container.type != CKEDITOR.NODE_ELEMENT )
				return container;

			return container.getChild( this.startOffset ) || container;
		},

		/**
		 * Get the node adjacent to the range end or {@link #endContainer}.
		 *
		 * @returns {CKEDITOR.dom.node}
		 */
		getTouchedEndNode: function() {
			var container = this.endContainer;

			if ( this.collapsed || container.type != CKEDITOR.NODE_ELEMENT )
				return container;

			return container.getChild( this.endOffset - 1 ) || container;
		},

		/**
		 * Gets next node which can be a container of a selection.
		 * This methods mimics a behavior of right/left arrow keys in case of
		 * collapsed selection. It does not return an exact position (with offset) though,
		 * but just a selection's container.
		 *
		 * Note: use this method on a collapsed range.
		 *
		 * @since 4.3.0
		 * @returns {CKEDITOR.dom.element/CKEDITOR.dom.text}
		 */
		getNextEditableNode: getNextEditableNode(),

		/**
		 * See {@link #getNextEditableNode}.
		 *
		 * @since 4.3.0
		 * @returns {CKEDITOR.dom.element/CKEDITOR.dom.text}
		 */
		getPreviousEditableNode: getNextEditableNode( 1 ),

		/**
		 * Returns any table element, like `td`, `tbody`, `table` etc. from a given range. The element
		 * is returned only if the range is contained within one table (might be a nested
		 * table, but it cannot be two different tables on the same DOM level).
		 *
		 * @private
		 * @since 4.7.0
		 * @param {Object} [tableElements] Mapping of element names that should be considered.
		 * @returns {CKEDITOR.dom.element/null}
		 */
		_getTableElement: function( tableElements ) {
			tableElements = tableElements || {
				td: 1,
				th: 1,
				tr: 1,
				tbody: 1,
				thead: 1,
				tfoot: 1,
				table: 1
			};

			var start = this.startContainer,
				end = this.endContainer,
				startTable = start.getAscendant( 'table', true ),
				endTable = end.getAscendant( 'table', true );

			// Inline editor may be initialized inside a table (#2403).
			if ( startTable && !this.root.contains( startTable ) ) {
				return null;
			}

			// Super weird edge case in Safari: if there is a table with only one cell inside and that cell
			// is selected, then the end boundary of the table is moved into editor's editable.
			// That case is also present when selecting the last cell inside nested table.
			if ( CKEDITOR.env.safari && startTable && end.equals( this.root ) ) {
				return start.getAscendant( tableElements, true );
			}

			if ( this.getEnclosedNode() ) {
				return this.getEnclosedNode().getAscendant( tableElements, true );
			}

			// Ensure that selection starts and ends in the same table or one of the table is inside the other.
			if ( startTable && endTable && ( startTable.equals( endTable ) || startTable.contains( endTable ) ||
				endTable.contains( startTable ) ) ) {

				return start.getAscendant( tableElements, true );
			}

			return null;
		},

		/**
		 * Scrolls the start of current range into view.
		 */
		scrollIntoView: function() {

			// The reference element contains a zero-width space to avoid
			// a premature removal. The view is to be scrolled with respect
			// to this element.
			var reference = new CKEDITOR.dom.element.createFromHtml( '<span>&nbsp;</span>', this.document ),
				afterCaretNode, startContainerText, isStartText;

			var range = this.clone();

			// Work with the range to obtain a proper caret position.
			range.optimize();

			// Currently in a text node, so we need to split it into two
			// halves and put the reference between.
			if ( isStartText = range.startContainer.type == CKEDITOR.NODE_TEXT ) {
				// Keep the original content. It will be restored.
				startContainerText = range.startContainer.getText();

				// Split the startContainer at the this position.
				afterCaretNode = range.startContainer.split( range.startOffset );

				// Insert the reference between two text nodes.
				reference.insertAfter( range.startContainer );
			}

			// If not in a text node, simply insert the reference into the range.
			else {
				range.insertNode( reference );
			}

			// Scroll with respect to the reference element.
			reference.scrollIntoView();

			// Get rid of split parts if "in a text node" case.
			// Revert the original text of the startContainer.
			if ( isStartText ) {
				range.startContainer.setText( startContainerText );
				afterCaretNode.remove();
			}

			// Get rid of the reference node. It is no longer necessary.
			reference.remove();
		},

		/**
		 * Returns an array of {@link CKEDITOR.dom.rect} elements that are represented as rectangles which are covered by ranges.
		 * Rectangles represent the area of the screen occupied by the elements contained within the range.
		 *
		 * In the following example:
		 *
		 * ```html
		 *  <p><span>first {span</span><span> second span</span></p>
		 *  <p><span>very long }span</span></p>
		 * ```
		 *
		 * Brackets represent the beginning and the end of the selection.
		 *
		 * Returned rectangles would be represented by areas like below:
		 *
		 * ```
		 * first [span][ second span]
		 * [very long ]span
		 * ```
		 *
		 * where each pair of brackets represents one rectangle.
		 *
		 * Note: Various browsers might return a different list of rectangles.
		 *
		 * Internet Explorer 8 does not have the native `range.getClientRects()` method, which is a base for this method, implemented.
		 * As a workaround it will return an array containing only one rectangle which would
		 * start in the top left-hand corner of the selection and end in the bottom right-hand corner.
		 * Possible cases when the returned rectangle does not fully cover ranges are presented below:
		 *
		 * <img src="https://33333.cdn.cke-cs.com/rc1DFuFpHqcR3Mah6y0e/images/90893fcc6c323c10023e73ebfc1fbaa622b48b29c066f7af_ie-rects.png">
		 *
		 * @since 4.10.0
		 * @param {Boolean} [isAbsolute] The function will retrieve an absolute rectangle of the element,
		 * i.e. a position relative to the upper-left corner of the topmost viewport.
		 * @returns {CKEDITOR.dom.rect[]}
		 */
		getClientRects: ( function() {
			if ( this.document.getSelection !== undefined ) {
				return function( isAbsolute ) {
					// We need to create native range so we can call native getClientRects.
					var range = this.root.getDocument().$.createRange(),
						rectList;

					range.setStart( this.startContainer.$, this.startOffset );
					range.setEnd( this.endContainer.$, this.endOffset );

					rectList = range.getClientRects();

					rectList = fixWidgetsRects( rectList, this );

					if ( !rectList.length ) {
						rectList = fixEmptyRectList( rectList, range, this );
					}

					return CKEDITOR.tools.array.map( rectList, function( item ) {
						return convertRect( item, isAbsolute, this );
					}, this );
				};
			} else {
				return function( isAbsolute ) {
					return [ convertRect( getRect( this.createBookmark() ), isAbsolute, this ) ];
				};
			}

			// Remove all widget rects except for outermost one.
			function fixWidgetsRects( rectList, context ) {
				var rectArray = CKEDITOR.tools.array.map( rectList, function( item ) {
						return item;
					} ),
					newRange = new CKEDITOR.dom.range( context.root ),
					widgetElements,
					widgetRects,
					widgetRange,
					documentFragment,
					moveStart,
					moveEnd;

				// In case of ranges start and end container set as widget wrapper, document container won't contain wrapper and we can't find its id.
				// Let's move ranges to parent element to fix that.
				if ( context.startContainer instanceof CKEDITOR.dom.element ) {
					moveStart = context.startOffset === 0 && context.startContainer.hasAttribute( 'data-widget' );
				}
				if ( context.endContainer instanceof CKEDITOR.dom.element ) {
					moveEnd = context.endOffset === ( context.endContainer.getChildCount ? context.endContainer.getChildCount() : context.endContainer.length );
					moveEnd = moveEnd && context.endContainer.hasAttribute( 'data-widget' );
				}

				if ( moveStart ) {
					newRange.setStart( context.startContainer.getParent(), context.startContainer.getIndex() );
				}
				if ( moveEnd ) {
					newRange.setEnd( context.endContainer.getParent(), context.endContainer.getIndex() + 1 );
				}
				if ( moveStart || moveEnd ) {
					context = newRange;
				}

				documentFragment = context.cloneContents();

				// Find all widget elements.
				widgetElements = documentFragment.find( '[data-cke-widget-id]' ).toArray();
				widgetElements = CKEDITOR.tools.array.map( widgetElements, function( item ) {
					var editor = context.root.editor,
						id = item.getAttribute( 'data-cke-widget-id' );
					return editor.widgets.instances[ id ].element;
				} );

				if ( !widgetElements ) {
					return;
				}

				// Once we have all widgets, get all theirs rects.
				widgetRects = CKEDITOR.tools.array.map( widgetElements, function( element ) {
					var rects,
						container = element.getParent().hasClass( 'cke_widget_wrapper' ) ? element.getParent() : element;
					widgetRange = this.root.getDocument().$.createRange();

					widgetRange.setStart( container.getParent().$, container.getIndex() );
					widgetRange.setEnd( container.getParent().$, container.getIndex() + 1 );

					rects = widgetRange.getClientRects();
					// Still some browsers might have wrong rect for widget.element so lets make sure it is correct.
					rects.widgetRect = element.getClientRect();

					return rects;
				}, context );

				CKEDITOR.tools.array.forEach( widgetRects, function( item ) {
					var found;
					cleanWidgetRects( 0 );

					function cleanWidgetRects( startIndex ) {
						CKEDITOR.tools.array.forEach( rectArray, function( rectArrayItem, index ) {
							var compare = CKEDITOR.tools.objectCompare( item[ startIndex ], rectArrayItem );

							if ( !compare ) {
								compare = CKEDITOR.tools.objectCompare( item.widgetRect, rectArrayItem );
							}

							if ( compare ) {
								// Find widget rect in rectArray and remove following rects that represent widget child elements.
								Array.prototype.splice.call( rectArray, index, item.length - startIndex, item.widgetRect );
								found = true;
							}
						} );

						if ( !found ) {
							if ( startIndex < rectArray.length - 1 ) {
								// If first rect isn't existing inside rectArray lets take another element for reference.
								cleanWidgetRects( startIndex + 1 );
							} else {
								// If none of widgets rect is found add widget element rect to rect list.
								rectArray.push( item.widgetRect );
							}
						}
					}
				} );

				return rectArray;
			}

			// Create rectList when browser natively doesn't return it.
			function fixEmptyRectList( rectList, range, context ) {
				var first,
					textNode,
					itemToInsertAfter;

				if ( !range.collapsed ) {
					// In some cases ( eg. ranges contain only image ) IE will return empty rectList.

					rectList = [ getRect( context.createBookmark() ) ];
				} else if ( context.startContainer instanceof CKEDITOR.dom.element ) {
					// If collapsed ranges are in element add textNode and return its rects.

					first = context.checkStartOfBlock();
					textNode = new CKEDITOR.dom.text( '\u200b' );

					if ( first ) {
						context.startContainer.append( textNode, true );
					} else {
						if ( context.startOffset === 0 ) {
							textNode.insertBefore( context.startContainer.getFirst() );
						} else {
							itemToInsertAfter = context.startContainer.getChildren().getItem( context.startOffset - 1 );
							textNode.insertAfter( itemToInsertAfter );
						}
					}

					// Create native collapsed ranges inside just created textNode.
					range.setStart( textNode.$, 0 );
					range.setEnd( textNode.$, 0 );

					rectList = range.getClientRects();
					textNode.remove();
				} else if ( context.startContainer instanceof CKEDITOR.dom.text ) {
					if ( context.startContainer.getText() === '' ) {
						// In case of empty text fill it with zero width space.
						context.startContainer.setText( '\u200b' );
						rectList = range.getClientRects();

						context.startContainer.setText( '' );

					} else {
						// If there is text node which isn't empty, but still no rects are returned use IE8 polyfill.
						// This happens with selection at the end of line in IE.
						rectList = [ getRect( context.createBookmark() ) ];
					}
				}
				return rectList;
			}

			// Extending empty object with rect, to prevent inheriting from DOMRect, same approach as in CKEDITOR.dom.element.getClientRect().
			function convertRect( rect, isAbsolute, context ) {
				var newRect = CKEDITOR.tools.extend( {}, rect );

				if ( isAbsolute ) {
					newRect = CKEDITOR.tools.getAbsoluteRectPosition( context.document.getWindow(), newRect );
				}

				// Some browsers might not return width and height.
				!newRect.width && ( newRect.width = newRect.right - newRect.left );
				!newRect.height && ( newRect.height = newRect.bottom - newRect.top );
				return newRect;
			}

			// Fallback helper for browsers that don't support native getClientRects().
			function getRect( bookmark ) {
				var start = bookmark.startNode,
					end = bookmark.endNode,
					rects;

				// Inserting zero width space, to prevent some strange rects returned by IE.
				start.setText( '\u200b' );
				start.removeStyle( 'display' );

				if ( end ) {
					end.setText( '\u200b' );
					end.removeStyle( 'display' );

					rects = [ start.getClientRect(), end.getClientRect() ];

					end.remove();
				} else {
					rects = [ start.getClientRect(), start.getClientRect() ];
				}
				start.remove();

				return {
					right: Math.max( rects[ 0 ].right, rects[ 1 ].right ),
					bottom: Math.max( rects[ 0 ].bottom, rects[ 1 ].bottom ),
					left: Math.min( rects[ 0 ].left, rects[ 1 ].left ),
					top: Math.min( rects[ 0 ].top, rects[ 1 ].top ),
					width: Math.abs( rects[ 0 ].left - rects[ 1 ].left ),
					height: Math.max( rects[ 0 ].bottom, rects[ 1 ].bottom ) - Math.min( rects[ 0 ].top, rects[ 1 ].top )
				};
			}
		} )(),

		/**
		 * Setter for the {@link #startContainer}.
		 *
		 * @since 4.4.6
		 * @private
		 * @param {CKEDITOR.dom.element} startContainer
		 */
		_setStartContainer: function( startContainer ) {
			this.startContainer = startContainer;
		},

		/**
		 * Setter for the {@link #endContainer}.
		 *
		 * @since 4.4.6
		 * @private
		 * @param {CKEDITOR.dom.element} endContainer
		 */
		_setEndContainer: function( endContainer ) {
			this.endContainer = endContainer;
		},

		/**
		 * Looks for elements matching the `query` selector within a range.
		 *
		 * @since 4.5.11
		 * @private
		 * @param {String} query A valid [CSS selector](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Selectors).
		 * @param {Boolean} [includeNonEditables=false] Whether elements with `contenteditable` set to `false` should
		 * be included.
		 * @returns {CKEDITOR.dom.element[]}
		 */
		_find: function( query, includeNonEditables ) {
			var ancestor = this.getCommonAncestor(),
				boundaries = this.getBoundaryNodes(),
				// Contrary to CKEDITOR.dom.element#find we're returning array, that's because NodeList is immutable, and we need
				// to do some filtering in returned list.
				ret = [],
				curItem,
				i,
				initialMatches,
				isStartGood,
				isEndGood;

			if ( ancestor && ancestor.find ) {
				initialMatches = ancestor.find( query );

				for ( i = 0; i < initialMatches.count(); i++ ) {
					curItem = initialMatches.getItem( i );

					// Using isReadOnly() method to filterout non editables. It checks isContentEditable including all browser quirks.
					if ( !includeNonEditables && curItem.isReadOnly() ) {
						continue;
					}

					// It's not enough to get elements from common ancestor, because it might contain too many matches.
					// We need to ensure that returned items are between boundary points.
					isStartGood = ( curItem.getPosition( boundaries.startNode ) & CKEDITOR.POSITION_FOLLOWING ) || boundaries.startNode.equals( curItem );
					isEndGood = ( curItem.getPosition( boundaries.endNode ) & ( CKEDITOR.POSITION_PRECEDING + CKEDITOR.POSITION_IS_CONTAINED ) ) || boundaries.endNode.equals( curItem );

					if ( isStartGood && isEndGood ) {
						ret.push( curItem );
					}
				}
			}

			return ret;
		}
	};

	/**
	 * Merges every subsequent range in given set, returning a smaller array of ranges.
	 *
	 * Note that each range in the returned value will be enlarged with `CKEDITOR.ENLARGE_ELEMENT` value.
	 *
	 * @since 4.7.0
	 * @static
	 * @param {CKEDITOR.dom.range[]} ranges
	 * @returns {CKEDITOR.dom.range[]} Set of merged ranges.
	 * @member CKEDITOR.dom.range
	 */
	CKEDITOR.dom.range.mergeRanges = function( ranges ) {
		return CKEDITOR.tools.array.reduce( ranges, function( ret, rng ) {
			// Last range ATM.
			var lastRange = ret[ ret.length - 1 ],
				isContinuation = false;

			// Make a clone, we don't want to modify input.
			rng = rng.clone();
			rng.enlarge( CKEDITOR.ENLARGE_ELEMENT );

			if ( lastRange ) {
				// The trick is to create a range spanning the gap between the two ranges. Then iterate over
				// each node found in this gap. If it contains anything other than whitespace, then it means it
				// is not a continuation.
				var gapRange = new CKEDITOR.dom.range( rng.root ),
					walker = new CKEDITOR.dom.walker( gapRange ),
					isWhitespace = CKEDITOR.dom.walker.whitespaces(),
					nodeInBetween;

				gapRange.setStart( lastRange.endContainer, lastRange.endOffset );
				gapRange.setEnd( rng.startContainer, rng.startOffset );

				nodeInBetween = walker.next();

				while ( isWhitespace( nodeInBetween ) || rng.endContainer.equals( nodeInBetween ) ) {
					// We don't care about whitespaces, and range container. Also we skip the endContainer,
					// as it will also be provided by the iterator (as it visits it's opening tag).
					nodeInBetween = walker.next();
				}

				// Simply, if anything has been found there's a content in between the two.
				isContinuation = !nodeInBetween;
			}

			if ( isContinuation ) {
				// If last range ends, where the current range starts, then let's merge it.
				lastRange.setEnd( rng.endContainer, rng.endOffset );
			} else {
				// In other case just push cur range into the stack.
				ret.push( rng );
			}

			return ret;
		}, [] );
	};

} )();

/**
 * Indicates a position after start of a node.
 *
 *		// When used according to an element:
 *		// <element>^contents</element>
 *
 *		// When used according to a text node:
 *		// "^text" (range is anchored in the text node)
 *
 * It is used as a parameter of methods like: {@link CKEDITOR.dom.range#moveToPosition},
 * {@link CKEDITOR.dom.range#setStartAt} and {@link CKEDITOR.dom.range#setEndAt}.
 *
 * @readonly
 * @member CKEDITOR
 * @property {Number} [=1]
 */
CKEDITOR.POSITION_AFTER_START = 1;

/**
 * Indicates a position before end of a node.
 *
 *		// When used according to an element:
 *		// <element>contents^</element>
 *
 *		// When used according to a text node:
 *		// "text^" (range is anchored in the text node)
 *
 * It is used as a parameter of methods like: {@link CKEDITOR.dom.range#moveToPosition},
 * {@link CKEDITOR.dom.range#setStartAt} and {@link CKEDITOR.dom.range#setEndAt}.
 *
 * @readonly
 * @member CKEDITOR
 * @property {Number} [=2]
 */
CKEDITOR.POSITION_BEFORE_END = 2;

/**
 * Indicates a position before start of a node.
 *
 *		// When used according to an element:
 *		// ^<element>contents</element> (range is anchored in element's parent)
 *
 *		// When used according to a text node:
 *		// ^"text" (range is anchored in text node's parent)
 *
 * It is used as a parameter of methods like: {@link CKEDITOR.dom.range#moveToPosition},
 * {@link CKEDITOR.dom.range#setStartAt} and {@link CKEDITOR.dom.range#setEndAt}.
 *
 * @readonly
 * @member CKEDITOR
 * @property {Number} [=3]
 */
CKEDITOR.POSITION_BEFORE_START = 3;

/**
 * Indicates a position after end of a node.
 *
 *		// When used according to an element:
 *		// <element>contents</element>^ (range is anchored in element's parent)
 *
 *		// When used according to a text node:
 *		// "text"^ (range is anchored in text node's parent)
 *
 * It is used as a parameter of methods like: {@link CKEDITOR.dom.range#moveToPosition},
 * {@link CKEDITOR.dom.range#setStartAt} and {@link CKEDITOR.dom.range#setEndAt}.
 *
 * @readonly
 * @member CKEDITOR
 * @property {Number} [=4]
 */
CKEDITOR.POSITION_AFTER_END = 4;

/**
 * @readonly
 * @member CKEDITOR
 * @property {Number} [=1]
 */
CKEDITOR.ENLARGE_ELEMENT = 1;

/**
 * @readonly
 * @member CKEDITOR
 * @property {Number} [=2]
 */
CKEDITOR.ENLARGE_BLOCK_CONTENTS = 2;

/**
 * @readonly
 * @member CKEDITOR
 * @property {Number} [=3]
 */
CKEDITOR.ENLARGE_LIST_ITEM_CONTENTS = 3;

/**
 * @readonly
 * @member CKEDITOR
 * @property {Number} [=4]
 */
CKEDITOR.ENLARGE_INLINE = 4;

// Check boundary types.

/**
 * See {@link CKEDITOR.dom.range#checkBoundaryOfElement}.
 *
 * @readonly
 * @member CKEDITOR
 * @property {Number} [=1]
 */
CKEDITOR.START = 1;

/**
 * See {@link CKEDITOR.dom.range#checkBoundaryOfElement}.
 *
 * @readonly
 * @member CKEDITOR
 * @property {Number} [=2]
 */
CKEDITOR.END = 2;

// Shrink range types.

/**
 * See {@link CKEDITOR.dom.range#shrink}.
 *
 * @readonly
 * @member CKEDITOR
 * @property {Number} [=1]
 */
CKEDITOR.SHRINK_ELEMENT = 1;

/**
 * See {@link CKEDITOR.dom.range#shrink}.
 *
 * @readonly
 * @member CKEDITOR
 * @property {Number} [=2]
 */
CKEDITOR.SHRINK_TEXT = 2;

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @ignore
 * File overview: DOM iterator which iterates over list items, lines and paragraphs.
 */

'use strict';

( function() {
	/**
	 * Represents the iterator class. It can be used to iterate
	 * over all elements (or even text nodes in case of {@link #enlargeBr} set to `false`)
	 * which establish "paragraph-like" spaces within the passed range.
	 *
	 *		// <h1>[foo</h1><p>bar]</p>
	 *		var iterator = range.createIterator();
	 *		iterator.getNextParagraph(); // h1 element
	 *		iterator.getNextParagraph(); // p element
	 *
	 *		// <ul><li>[foo</li><li>bar]</li>
	 *		// With enforceRealBlocks set to false the iterator will return two list item elements.
	 *		// With enforceRealBlocks set to true the iterator will return two paragraphs and the DOM will be changed to:
	 *		// <ul><li><p>foo</p></li><li><p>bar</p></li>
	 *
	 * @class CKEDITOR.dom.iterator
	 * @constructor Creates an iterator class instance.
	 * @param {CKEDITOR.dom.range} range
	 */
	function iterator( range ) {
		if ( arguments.length < 1 )
			return;

		/**
		 * @readonly
		 * @property {CKEDITOR.dom.range}
		 */
		this.range = range;

		/**
		 * @property {Boolean} [forceBrBreak=false]
		 */
		this.forceBrBreak = 0;

		// (https://dev.ckeditor.com/ticket/3730).
		/**
		 * Whether to include `<br>` elements in the enlarged range. Should be
		 * set to `false` when using the iterator in the {@link CKEDITOR#ENTER_BR} mode.
		 *
		 * @property {Boolean} [enlargeBr=true]
		 */
		this.enlargeBr = 1;

		/**
		 * Whether the iterator should create a transformable block
		 * if the current one contains text and cannot be transformed.
		 * For example new blocks will be established in elements like
		 * `<li>` or `<td>`.
		 *
		 * @property {Boolean} [enforceRealBlocks=false]
		 */
		this.enforceRealBlocks = 0;

		this._ || ( this._ = {} );
	}

	/**
	 * Default iterator's filter. It is set only for nested iterators.
	 *
	 * @since 4.3.0
	 * @readonly
	 * @property {CKEDITOR.filter} filter
	 */

	/**
	 * Iterator's active filter. It is set by the {@link #getNextParagraph} method
	 * when it enters a nested editable.
	 *
	 * @since 4.3.0
	 * @readonly
	 * @property {CKEDITOR.filter} activeFilter
	 */

	var beginWhitespaceRegex = /^[\r\n\t ]+$/,
		// Ignore bookmark nodes.(https://dev.ckeditor.com/ticket/3783)
		bookmarkGuard = CKEDITOR.dom.walker.bookmark( false, true ),
		whitespacesGuard = CKEDITOR.dom.walker.whitespaces( true ),
		skipGuard = function( node ) {
			return bookmarkGuard( node ) && whitespacesGuard( node );
		},
		listItemNames = { dd: 1, dt: 1, li: 1 };

	iterator.prototype = {
		/**
		 * Returns the next paragraph-like element or `null` if the end of a range is reached.
		 *
		 * @param {String} [blockTag='p'] Name of a block element which will be established by
		 * the iterator in block-less elements (see {@link #enforceRealBlocks}).
		 */
		getNextParagraph: function( blockTag ) {
			// The block element to be returned.
			var block;

			// The range object used to identify the paragraph contents.
			var range;

			// Indicats that the current element in the loop is the last one.
			var isLast;

			// Instructs to cleanup remaining BRs.
			var removePreviousBr, removeLastBr;

			blockTag = blockTag || 'p';

			// We're iterating over nested editable.
			if ( this._.nestedEditable ) {
				// Get next block from nested iterator and returns it if was found.
				block = this._.nestedEditable.iterator.getNextParagraph( blockTag );
				if ( block ) {
					// Inherit activeFilter from the nested iterator.
					this.activeFilter = this._.nestedEditable.iterator.activeFilter;
					return block;
				}

				// No block in nested iterator means that we reached the end of the nested editable.
				// Reset the active filter to the default filter (or undefined if this iterator didn't have it).
				this.activeFilter = this.filter;

				// Try to find next nested editable or get back to parent (this) iterator.
				if ( startNestedEditableIterator( this, blockTag, this._.nestedEditable.container, this._.nestedEditable.remaining ) ) {
					// Inherit activeFilter from the nested iterator.
					this.activeFilter = this._.nestedEditable.iterator.activeFilter;
					return this._.nestedEditable.iterator.getNextParagraph( blockTag );
				} else {
					this._.nestedEditable = null;
				}
			}

			// Block-less range should be checked first.
			if ( !this.range.root.getDtd()[ blockTag ] )
				return null;

			// This is the first iteration. Let's initialize it.
			if ( !this._.started )
				range = startIterator.call( this );

			var currentNode = this._.nextNode,
				lastNode = this._.lastNode;

			this._.nextNode = null;
			while ( currentNode ) {
				// closeRange indicates that a paragraph boundary has been found,
				// so the range can be closed.
				var closeRange = 0,
					parentPre = currentNode.hasAscendant( 'pre' );

				// includeNode indicates that the current node is good to be part
				// of the range. By default, any non-element node is ok for it.
				var includeNode = ( currentNode.type != CKEDITOR.NODE_ELEMENT ),
					continueFromSibling = 0;

				// If it is an element node, let's check if it can be part of the range.
				if ( !includeNode ) {
					var nodeName = currentNode.getName();

					// Non-editable block was found - return it and move to processing
					// its nested editables if they exist.
					if ( CKEDITOR.dtd.$block[ nodeName ] && currentNode.getAttribute( 'contenteditable' ) == 'false' ) {
						block = currentNode;

						// Setup iterator for first of nested editables.
						// If there's no editable, then algorithm will move to next element after current block.
						startNestedEditableIterator( this, blockTag, block );

						// Gets us straight to the end of getParagraph() because block variable is set.
						break;
					} else if ( currentNode.isBlockBoundary( this.forceBrBreak && !parentPre && { br: 1 } ) ) {
						// <br> boundaries must be part of the range. It will
						// happen only if ForceBrBreak.
						if ( nodeName == 'br' )
							includeNode = 1;
						else if ( !range && !currentNode.getChildCount() && nodeName != 'hr' ) {
							// If we have found an empty block, and haven't started
							// the range yet, it means we must return this block.
							block = currentNode;
							isLast = currentNode.equals( lastNode );
							break;
						}

						// The range must finish right before the boundary,
						// including possibly skipped empty spaces. (https://dev.ckeditor.com/ticket/1603)
						if ( range ) {
							range.setEndAt( currentNode, CKEDITOR.POSITION_BEFORE_START );

							// The found boundary must be set as the next one at this
							// point. (https://dev.ckeditor.com/ticket/1717)
							if ( nodeName != 'br' ) {
								this._.nextNode = currentNode;
							}
						}

						closeRange = 1;
					} else {
						// If we have child nodes, let's check them.
						if ( currentNode.getFirst() ) {
							// If we don't have a range yet, let's start it.
							if ( !range ) {
								range = this.range.clone();
								range.setStartAt( currentNode, CKEDITOR.POSITION_BEFORE_START );
							}

							currentNode = currentNode.getFirst();
							continue;
						}
						includeNode = 1;
					}
				} else if ( currentNode.type == CKEDITOR.NODE_TEXT ) {
					// Ignore normal whitespaces (i.e. not including &nbsp; or
					// other unicode whitespaces) before/after a block node.
					if ( beginWhitespaceRegex.test( currentNode.getText() ) )
						includeNode = 0;
				}

				// The current node is good to be part of the range and we are
				// starting a new range, initialize it first.
				if ( includeNode && !range ) {
					range = this.range.clone();
					range.setStartAt( currentNode, CKEDITOR.POSITION_BEFORE_START );
				}

				// The last node has been found.
				isLast = ( ( !closeRange || includeNode ) && currentNode.equals( lastNode ) );

				// If we are in an element boundary, let's check if it is time
				// to close the range, otherwise we include the parent within it.
				if ( range && !closeRange ) {
					while ( !currentNode.getNext( skipGuard ) && !isLast ) {
						var parentNode = currentNode.getParent();

						if ( parentNode.isBlockBoundary( this.forceBrBreak && !parentPre && { br: 1 } ) ) {
							closeRange = 1;
							includeNode = 0;
							isLast = isLast || ( parentNode.equals( lastNode ) );
							// Make sure range includes bookmarks at the end of the block. (https://dev.ckeditor.com/ticket/7359)
							range.setEndAt( parentNode, CKEDITOR.POSITION_BEFORE_END );
							break;
						}

						currentNode = parentNode;
						includeNode = 1;
						isLast = ( currentNode.equals( lastNode ) );
						continueFromSibling = 1;
					}
				}

				// Now finally include the node.
				if ( includeNode )
					range.setEndAt( currentNode, CKEDITOR.POSITION_AFTER_END );

				currentNode = this._getNextSourceNode( currentNode, continueFromSibling, lastNode );
				isLast = !currentNode;

				// We have found a block boundary. Let's close the range and move out of the
				// loop.
				if ( isLast || ( closeRange && range ) )
					break;
			}

			// Now, based on the processed range, look for (or create) the block to be returned.
			if ( !block ) {
				// If no range has been found, this is the end.
				if ( !range ) {
					this._.docEndMarker && this._.docEndMarker.remove();
					this._.nextNode = null;
					return null;
				}

				var startPath = new CKEDITOR.dom.elementPath( range.startContainer, range.root );
				var startBlockLimit = startPath.blockLimit,
					checkLimits = { div: 1, th: 1, td: 1 };
				block = startPath.block;

				if ( !block && startBlockLimit && !this.enforceRealBlocks && checkLimits[ startBlockLimit.getName() ] &&
					range.checkStartOfBlock() && range.checkEndOfBlock() && !startBlockLimit.equals( range.root ) ) {
					block = startBlockLimit;
				} else if ( !block || ( this.enforceRealBlocks && block.is( listItemNames ) ) ) {
					// Create the fixed block.
					block = this.range.document.createElement( blockTag );

					// Move the contents of the temporary range to the fixed block.
					range.extractContents().appendTo( block );
					block.trim();

					// Insert the fixed block into the DOM.
					range.insertNode( block );

					removePreviousBr = removeLastBr = true;
				} else if ( block.getName() != 'li' ) {
					// If the range doesn't includes the entire contents of the
					// block, we must split it, isolating the range in a dedicated
					// block.
					if ( !range.checkStartOfBlock() || !range.checkEndOfBlock() ) {
						// The resulting block will be a clone of the current one.
						block = block.clone( false );

						// Extract the range contents, moving it to the new block.
						range.extractContents().appendTo( block );
						block.trim();

						// Split the block. At this point, the range will be in the
						// right position for our intents.
						var splitInfo = range.splitBlock();

						removePreviousBr = !splitInfo.wasStartOfBlock;
						removeLastBr = !splitInfo.wasEndOfBlock;

						// Insert the new block into the DOM.
						range.insertNode( block );
					}
				} else if ( !isLast ) {
					// LIs are returned as is, with all their children (due to the
					// nested lists). But, the next node is the node right after
					// the current range, which could be an <li> child (nested
					// lists) or the next sibling <li>.

					this._.nextNode = ( block.equals( lastNode ) ? null : this._getNextSourceNode( range.getBoundaryNodes().endNode, 1, lastNode  ) );
				}
			}

			if ( removePreviousBr ) {
				var previousSibling = block.getPrevious();
				if ( previousSibling && previousSibling.type == CKEDITOR.NODE_ELEMENT ) {
					if ( previousSibling.getName() == 'br' )
						previousSibling.remove();
					else if ( previousSibling.getLast() && previousSibling.getLast().$.nodeName.toLowerCase() == 'br' )
						previousSibling.getLast().remove();
				}
			}

			if ( removeLastBr ) {
				var lastChild = block.getLast();
				if ( lastChild && lastChild.type == CKEDITOR.NODE_ELEMENT && lastChild.getName() == 'br' ) {
					// Remove br filler on browser which do not need it.
					if ( !CKEDITOR.env.needsBrFiller || lastChild.getPrevious( bookmarkGuard ) || lastChild.getNext( bookmarkGuard ) )
						lastChild.remove();
				}
			}

			// Get a reference for the next element. This is important because the
			// above block can be removed or changed, so we can rely on it for the
			// next interation.
			if ( !this._.nextNode ) {
				this._.nextNode = ( isLast || block.equals( lastNode ) || !lastNode ) ? null : this._getNextSourceNode( block, 1, lastNode );
			}

			return block;
		},

		/**
		 * Gets the next element to check or `null` when the `lastNode` or the
		 * {@link #range}'s {@link CKEDITOR.dom.range#root root} is reached. Bookmarks are skipped.
		 *
		 * @since 4.4.6
		 * @private
		 * @param {CKEDITOR.dom.node} node
		 * @param {Boolean} startFromSibling
		 * @param {CKEDITOR.dom.node} lastNode
		 * @returns {CKEDITOR.dom.node}
		 */
		_getNextSourceNode: function( node, startFromSibling, lastNode ) {
			var rootNode = this.range.root,
				next;

			// Here we are checking in guard function whether current element
			// reach lastNode(default behaviour) and root node to prevent against
			// getting out of editor instance root DOM object.
			// https://dev.ckeditor.com/ticket/12484
			function guardFunction( node ) {
				return !( node.equals( lastNode ) || node.equals( rootNode ) );
			}

			next = node.getNextSourceNode( startFromSibling, null, guardFunction );
			while ( !bookmarkGuard( next ) ) {
				next = next.getNextSourceNode( startFromSibling, null, guardFunction );
			}
			return next;
		}
	};

	// @context CKEDITOR.dom.iterator
	// @returns Collapsed range which will be reused when during furter processing.
	function startIterator() {
		var range = this.range.clone(),
			// Indicate at least one of the range boundaries is inside a preformat block.
			touchPre,

			// (https://dev.ckeditor.com/ticket/12178)
			// Remember if following situation takes place:
			// * startAtInnerBoundary: <p>foo[</p>...
			// * endAtInnerBoundary: ...<p>]bar</p>
			// Because information about line break will be lost when shrinking range.
			// Note that we test only if path block exist, because we must properly shrink
			// range containing table and/or table cells.
			// Note: When range is collapsed there's no way it can be shrinked.
			// By checking if range is collapsed we also prevent https://dev.ckeditor.com/ticket/12308.
			startPath = range.startPath(),
			endPath = range.endPath(),
			startAtInnerBoundary = !range.collapsed && rangeAtInnerBlockBoundary( range, startPath.block ),
			endAtInnerBoundary = !range.collapsed && rangeAtInnerBlockBoundary( range, endPath.block, 1 );

		// Shrink the range to exclude harmful "noises" (https://dev.ckeditor.com/ticket/4087, https://dev.ckeditor.com/ticket/4450, https://dev.ckeditor.com/ticket/5435).
		range.shrink( CKEDITOR.SHRINK_ELEMENT, true );

		if ( startAtInnerBoundary )
			range.setStartAt( startPath.block, CKEDITOR.POSITION_BEFORE_END );
		if ( endAtInnerBoundary )
			range.setEndAt( endPath.block, CKEDITOR.POSITION_AFTER_START );

		touchPre = range.endContainer.hasAscendant( 'pre', true ) || range.startContainer.hasAscendant( 'pre', true );

		range.enlarge( this.forceBrBreak && !touchPre || !this.enlargeBr ? CKEDITOR.ENLARGE_LIST_ITEM_CONTENTS : CKEDITOR.ENLARGE_BLOCK_CONTENTS );

		if ( !range.collapsed ) {
			var walker = new CKEDITOR.dom.walker( range.clone() ),
				ignoreBookmarkTextEvaluator = CKEDITOR.dom.walker.bookmark( true, true );
			// Avoid anchor inside bookmark inner text.
			walker.evaluator = ignoreBookmarkTextEvaluator;
			this._.nextNode = walker.next();
			// TODO: It's better to have walker.reset() used here.
			walker = new CKEDITOR.dom.walker( range.clone() );
			walker.evaluator = ignoreBookmarkTextEvaluator;
			var lastNode = walker.previous();
			this._.lastNode = lastNode.getNextSourceNode( true, null, range.root );

			// We may have an empty text node at the end of block due to [3770].
			// If that node is the lastNode, it would cause our logic to leak to the
			// next block.(https://dev.ckeditor.com/ticket/3887)
			if ( this._.lastNode && this._.lastNode.type == CKEDITOR.NODE_TEXT && !CKEDITOR.tools.trim( this._.lastNode.getText() ) && this._.lastNode.getParent().isBlockBoundary() ) {
				var testRange = this.range.clone();
				testRange.moveToPosition( this._.lastNode, CKEDITOR.POSITION_AFTER_END );
				if ( testRange.checkEndOfBlock() ) {
					var path = new CKEDITOR.dom.elementPath( testRange.endContainer, testRange.root ),
						lastBlock = path.block || path.blockLimit;
					this._.lastNode = lastBlock.getNextSourceNode( true );
				}
			}

			// The end of document or range.root was reached, so we need a marker node inside.
			if ( !this._.lastNode || !range.root.contains( this._.lastNode ) ) {
				this._.lastNode = this._.docEndMarker = range.document.createText( '' );
				this._.lastNode.insertAfter( lastNode );
			}

			// Let's reuse this variable.
			range = null;
		}

		this._.started = 1;

		return range;
	}

	// Does a nested editables lookup inside editablesContainer.
	// If remainingEditables is set will lookup inside this array.
	// @param {CKEDITOR.dom.element} editablesContainer
	// @param {CKEDITOR.dom.element[]} [remainingEditables]
	function getNestedEditableIn( editablesContainer, remainingEditables ) {
		if ( remainingEditables == null )
			remainingEditables = findNestedEditables( editablesContainer );

		var editable;

		while ( ( editable = remainingEditables.shift() ) ) {
			if ( isIterableEditable( editable ) )
				return { element: editable, remaining: remainingEditables };
		}

		return null;
	}

	// Checkes whether we can iterate over this editable.
	function isIterableEditable( editable ) {
		// Reject blockless editables.
		return editable.getDtd().p;
	}

	// Finds nested editables within container. Does not return
	// editables nested in another editable (twice).
	function findNestedEditables( container ) {
		var editables = [];

		container.forEach( function( element ) {
			if ( element.getAttribute( 'contenteditable' ) == 'true' ) {
				editables.push( element );
				return false; // Skip children.
			}
		}, CKEDITOR.NODE_ELEMENT, true );

		return editables;
	}

	// Looks for a first nested editable after previousEditable (if passed) and creates
	// nested iterator for it.
	function startNestedEditableIterator( parentIterator, blockTag, editablesContainer, remainingEditables ) {
		var editable = getNestedEditableIn( editablesContainer, remainingEditables );

		if ( !editable )
			return 0;

		var filter = CKEDITOR.filter.instances[ editable.element.data( 'cke-filter' ) ];

		// If current editable has a filter and this filter does not allow for block tag,
		// search for next nested editable in remaining ones.
		if ( filter && !filter.check( blockTag ) )
			return startNestedEditableIterator( parentIterator, blockTag, editablesContainer, editable.remaining );

		var range = new CKEDITOR.dom.range( editable.element );
		range.selectNodeContents( editable.element );

		var iterator = range.createIterator();
		// This setting actually does not change anything in this case,
		// because entire range contents is selected, so there're no <br>s to be included.
		// But it seems right to copy it too.
		iterator.enlargeBr = parentIterator.enlargeBr;
		// Inherit configuration from parent iterator.
		iterator.enforceRealBlocks = parentIterator.enforceRealBlocks;
		// Set the activeFilter (which can be overriden when this iteator will start nested iterator)
		// and the default filter, which will make it possible to reset to
		// current iterator's activeFilter after leaving nested editable.
		iterator.activeFilter = iterator.filter = filter;

		parentIterator._.nestedEditable = {
			element: editable.element,
			container: editablesContainer,
			remaining: editable.remaining,
			iterator: iterator
		};

		return 1;
	}

	// Checks whether range starts or ends at inner block boundary.
	// See usage comments to learn more.
	function rangeAtInnerBlockBoundary( range, block, checkEnd ) {
		if ( !block )
			return false;

		var testRange = range.clone();
		testRange.collapse( !checkEnd );
		return testRange.checkBoundaryOfElement( block, checkEnd ? CKEDITOR.START : CKEDITOR.END );
	}

	/**
	 * Creates a {@link CKEDITOR.dom.iterator} instance for this range.
	 *
	 * @member CKEDITOR.dom.range
	 * @returns {CKEDITOR.dom.iterator}
	 */
	CKEDITOR.dom.range.prototype.createIterator = function() {
		return new iterator( this );
	};
} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * Represents a command that can be executed on an editor instance.
 *
 *		var command = new CKEDITOR.command( editor, {
 *			exec: function( editor ) {
 *				alert( editor.document.getBody().getHtml() );
 *			}
 *		} );
 *
 * @class
 * @extends CKEDITOR.commandDefinition
 * @mixins CKEDITOR.event
 * @constructor Creates a command class instance.
 * @param {CKEDITOR.editor} editor The editor instance this command will be
 * related to.
 * @param {CKEDITOR.commandDefinition} commandDefinition The command
 * definition.
 */
CKEDITOR.command = function( editor, commandDefinition ) {
	/**
	 * Lists UI items that are associated to this command. This list can be
	 * used to interact with the UI on command execution (by the execution code
	 * itself, for example).
	 *
	 *		alert( 'Number of UI items associated to this command: ' + command.uiItems.length );
	 */
	this.uiItems = [];

	/**
	 * Executes the command.
	 *
	 *		command.exec(); // The command gets executed.
	 *
	 * **Note:** You should use the {@link CKEDITOR.editor#execCommand} method instead of calling
	 * `command.exec()` directly.
	 *
	 * @param {Object} [data] Any data to pass to the command. Depends on the
	 * command implementation and requirements.
	 * @returns {Boolean} A boolean indicating that the command has been successfully executed.
	 */
	this.exec = function( data ) {
		if ( this.state == CKEDITOR.TRISTATE_DISABLED || !this.checkAllowed() )
			return false;

		if ( this.editorFocus ) // Give editor focus if necessary (https://dev.ckeditor.com/ticket/4355).
			editor.focus();

		if ( this.fire( 'exec' ) === false )
			return true;

		return ( commandDefinition.exec.call( this, editor, data ) !== false );
	};

	/**
	 * Explicitly update the status of the command, by firing the {@link CKEDITOR.command#event-refresh} event,
	 * as well as invoke the {@link CKEDITOR.commandDefinition#refresh} method if defined, this method
	 * is to allow different parts of the editor code to contribute in command status resolution.
	 *
	 * @param {CKEDITOR.editor} editor The editor instance.
	 * @param {CKEDITOR.dom.elementPath} path
	 */
	this.refresh = function( editor, path ) {
		// Do nothing is we're on read-only and this command doesn't support it.
		// We don't need to disabled the command explicitely here, because this
		// is already done by the "readOnly" event listener.
		if ( !this.readOnly && editor.readOnly )
			return true;

		// Disable commands that are not allowed in the current selection path context.
		if ( this.context && !path.isContextFor( this.context ) ) {
			this.disable();
			return true;
		}

		// Disable commands that are not allowed by the active filter.
		if ( !this.checkAllowed( true ) ) {
			this.disable();
			return true;
		}

		// Make the "enabled" state a default for commands enabled from start.
		if ( !this.startDisabled )
			this.enable();

		// Disable commands which shouldn't be enabled in this mode.
		if ( this.modes && !this.modes[ editor.mode ] )
			this.disable();

		if ( this.fire( 'refresh', { editor: editor, path: path } ) === false )
			return true;

		return ( commandDefinition.refresh && commandDefinition.refresh.apply( this, arguments ) !== false );
	};

	var allowed;

	/**
	 * Checks whether this command is allowed by the active allowed
	 * content filter ({@link CKEDITOR.editor#activeFilter}). This means
	 * that if command implements {@link CKEDITOR.feature} interface it will be tested
	 * by the {@link CKEDITOR.filter#checkFeature} method.
	 *
	 * @since 4.1.0
	 * @param {Boolean} [noCache] Skip cache for example due to active filter change. Since CKEditor 4.2.0.
	 * @returns {Boolean} Whether this command is allowed.
	 */
	this.checkAllowed = function( noCache ) {
		if ( !noCache && typeof allowed == 'boolean' )
			return allowed;

		return allowed = editor.activeFilter.checkFeature( this );
	};

	CKEDITOR.tools.extend( this, commandDefinition, {
		/**
		 * The editor modes within which the command can be executed. The
		 * execution will have no action if the current mode is not listed
		 * in this property.
		 *
		 *		// Enable the command in both WYSIWYG and Source modes.
		 *		command.modes = { wysiwyg:1,source:1 };
		 *
		 *		// Enable the command in Source mode only.
		 *		command.modes = { source:1 };
		 *
		 * @see CKEDITOR.editor#mode
		 */
		modes: { wysiwyg: 1 },

		/**
		 * Indicates that the editor will get the focus before executing
		 * the command.
		 *
		 *		// Do not force the editor to have focus when executing the command.
		 *		command.editorFocus = false;
		 *
		 * @property {Boolean} [=true]
		 */
		editorFocus: 1,

		/**
		 * Indicates that this command is sensible to the selection context.
		 * If `true`, the {@link CKEDITOR.command#method-refresh} method will be
		 * called for this command on the {@link CKEDITOR.editor#event-selectionChange} event.
		 *
		 * @property {Boolean} [=false]
		 */
		contextSensitive: !!commandDefinition.context,

		/**
		 * Indicates the editor state. Possible values are:
		 *
		 * * {@link CKEDITOR#TRISTATE_DISABLED}: the command is
		 *     disabled. It's execution will have no effect. Same as {@link #disable}.
		 * * {@link CKEDITOR#TRISTATE_ON}: the command is enabled
		 *     and currently active in the editor (for context sensitive commands,	for example).
		 * * {@link CKEDITOR#TRISTATE_OFF}: the command is enabled
		 *     and currently inactive in the editor (for context sensitive	commands, for example).
		 *
		 * Do not set this property directly, using the {@link #setState} method instead.
		 *
		 *		if ( command.state == CKEDITOR.TRISTATE_DISABLED )
		 *			alert( 'This command is disabled' );
		 *
		 * @property {Number} [=CKEDITOR.TRISTATE_DISABLED]
		 */
		state: CKEDITOR.TRISTATE_DISABLED
	} );

	// Call the CKEDITOR.event constructor to initialize this instance.
	CKEDITOR.event.call( this );
};

CKEDITOR.command.prototype = {
	/**
	 * Enables the command for execution. The command state (see
	 * {@link CKEDITOR.command#property-state}) available before disabling it is restored.
	 *
	 *		command.enable();
	 *		command.exec(); // Execute the command.
	 */
	enable: function() {
		if ( this.state == CKEDITOR.TRISTATE_DISABLED && this.checkAllowed() )
			this.setState( ( !this.preserveState || ( typeof this.previousState == 'undefined' ) ) ? CKEDITOR.TRISTATE_OFF : this.previousState );
	},

	/**
	 * Disables the command for execution. The command state (see
	 * {@link CKEDITOR.command#property-state}) will be set to {@link CKEDITOR#TRISTATE_DISABLED}.
	 *
	 *		command.disable();
	 *		command.exec(); // "false" - Nothing happens.
	 */
	disable: function() {
		this.setState( CKEDITOR.TRISTATE_DISABLED );
	},

	/**
	 * Sets the command state.
	 *
	 *		command.setState( CKEDITOR.TRISTATE_ON );
	 *		command.exec(); // Execute the command.
	 *		command.setState( CKEDITOR.TRISTATE_DISABLED );
	 *		command.exec(); // 'false' - Nothing happens.
	 *		command.setState( CKEDITOR.TRISTATE_OFF );
	 *		command.exec(); // Execute the command.
	 *
	 * @param {Number} newState The new state. See {@link #property-state}.
	 * @returns {Boolean} Returns `true` if the command state changed.
	 */
	setState: function( newState ) {
		// Do nothing if there is no state change.
		if ( this.state == newState )
			return false;

		if ( newState != CKEDITOR.TRISTATE_DISABLED && !this.checkAllowed() )
			return false;

		this.previousState = this.state;

		// Set the new state.
		this.state = newState;

		// Fire the "state" event, so other parts of the code can react to the
		// change.
		this.fire( 'state' );

		return true;
	},

	/**
	 * Toggles the on/off (active/inactive) state of the command. This is
	 * mainly used internally by context sensitive commands.
	 *
	 *		command.toggleState();
	 */
	toggleState: function() {
		if ( this.state == CKEDITOR.TRISTATE_OFF )
			this.setState( CKEDITOR.TRISTATE_ON );
		else if ( this.state == CKEDITOR.TRISTATE_ON )
			this.setState( CKEDITOR.TRISTATE_OFF );
	}
};

CKEDITOR.event.implementOn( CKEDITOR.command.prototype );

/**
 * Indicates the previous command state.
 *
 *		alert( command.previousState );
 *
 * @property {Number} previousState
 * @see #state
 */

/**
 * Fired when the command state changes.
 *
 *		command.on( 'state', function() {
 *			// Alerts the new state.
 *			alert( this.state );
 *		} );
 *
 * @event state
 */

/**
 * @event refresh
 * @todo
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Defines the {@link CKEDITOR.config} object that stores the
 * default configuration settings.
 */

/**
 * Used in conjunction with the {@link CKEDITOR.config#enterMode}
 * and {@link CKEDITOR.config#shiftEnterMode} configuration
 * settings to make the editor produce `<p>` tags when
 * using the <kbd>Enter</kbd> key.
 *
 * Read more in the {@glink features/enterkey documentation} and see the
 * {@glink examples/enterkey example}.
 *
 * @readonly
 * @property {Number} [=1]
 * @member CKEDITOR
 */
CKEDITOR.ENTER_P = 1;

/**
 * Used in conjunction with the {@link CKEDITOR.config#enterMode}
 * and {@link CKEDITOR.config#shiftEnterMode} configuration
 * settings to make the editor produce `<br>` tags when
 * using the <kbd>Enter</kbd> key.
 *
 * Read more in the {@glink features/enterkey documentation} and see the
 * {@glink examples/enterkey example}.
 *
 * @readonly
 * @property {Number} [=2]
 * @member CKEDITOR
 */
CKEDITOR.ENTER_BR = 2;

/**
 * Used in conjunction with the {@link CKEDITOR.config#enterMode}
 * and {@link CKEDITOR.config#shiftEnterMode} configuration
 * settings to make the editor produce `<div>` tags when
 * using the <kbd>Enter</kbd> key.
 *
 * Read more in the {@glink features/enterkey documentation} and see the
 * {@glink examples/enterkey example}.
 *
 * @readonly
 * @property {Number} [=3]
 * @member CKEDITOR
 */
CKEDITOR.ENTER_DIV = 3;

/**
 * Stores default configuration settings. Changes to this object are
 * reflected in all editor instances, if not specified otherwise for a particular
 * instance.
 *
 * Read more about setting CKEditor configuration in the
 * {@glink guide/dev_configuration documentation}.
 *
 * @class
 * @singleton
 */
CKEDITOR.config = {
	/**
	 * The URL path to the custom configuration file to be loaded. If not
	 * overwritten with inline configuration, it defaults to the `config.js`
	 * file present in the root of the CKEditor installation directory.
	 *
	 * CKEditor will recursively load custom configuration files defined inside
	 * other custom configuration files.
	 *
	 * Read more about setting CKEditor configuration in the
	 * {@glink guide/dev_configuration documentation}.
	 *
	 *		// Load a specific configuration file.
	 *		CKEDITOR.replace( 'myfield', { customConfig: '/myconfig.js' } );
	 *
	 *		// Do not load any custom configuration file.
	 *		CKEDITOR.replace( 'myfield', { customConfig: '' } );
	 *
	 * @cfg {String} [="<CKEditor folder>/config.js"]
	 */
	customConfig: 'config.js',

	/**
	 * Whether the element replaced by the editor (usually a `<textarea>`)
	 * is to be updated automatically when posting the form containing the editor.
	 *
	 * @cfg
	 */
	autoUpdateElement: true,

	/**
	 * The user interface language localization to use. If left empty, the editor
	 * will automatically be localized to the user language. If the user language is not supported,
	 * the language specified in the {@link CKEDITOR.config#defaultLanguage}
	 * configuration setting is used.
	 *
	 * Read more in the {@glink features/uilanguage documentation} and see the
	 * {@glink examples/uilanguages example}.
	 *
	 *		// Load the German interface.
	 *		config.language = 'de';
	 *
	 * @cfg
	 */
	language: '',

	/**
	 * The language to be used if the {@link CKEDITOR.config#language}
	 * setting is left empty and it is not possible to localize the editor to the user language.
	 *
	 * Read more in the {@glink features/uilanguage documentation} and see the
	 * {@glink examples/uilanguages example}.
	 *
	 *		config.defaultLanguage = 'it';
	 *
	 * @cfg
	 */
	defaultLanguage: 'en',

	/**
	 * The writing direction of the language which is used to create editor content.
	 * Allowed values are:
	 *
	 * * `''` (an empty string) &ndash; Indicates that content direction will be the same as either
	 *      the editor UI direction or the page element direction depending on the editor type:
	 *     * {@glink guide/dev_framed Classic editor} &ndash; The same as the user interface language direction.
	 *     * {@glink guide/dev_inline Inline editor}&ndash; The same as the editable element text direction.
	 * * `'ltr'` &ndash; Indicates a Left-To-Right text direction (like in English).
	 * * `'rtl'` &ndash; Indicates a Right-To-Left text direction (like in Arabic).
	 *
	 * See the {@glink examples/language example}.
	 *
	 * Example:
	 *
	 *		config.contentsLangDirection = 'rtl';
	 *
	 * @cfg
	 */
	contentsLangDirection: '',

	/**
	 * Sets the behavior of the <kbd>Enter</kbd> key. It also determines other behavior
	 * rules of the editor, like whether the `<br>` element is to be used
	 * as a paragraph separator when indenting text.
	 * The allowed values are the following constants that cause the behavior outlined below:
	 *
	 * * {@link CKEDITOR#ENTER_P} (1) &ndash; New `<p>` paragraphs are created.
	 * * {@link CKEDITOR#ENTER_BR} (2) &ndash; Lines are broken with `<br>` elements.
	 * * {@link CKEDITOR#ENTER_DIV} (3) &ndash; New `<div>` blocks are created.
	 *
	 * **Note**: It is recommended to use the {@link CKEDITOR#ENTER_P} setting because of
	 * its semantic value and correctness. The editor is optimized for this setting.
	 *
	 * Read more in the {@glink features/enterkey documentation} and see the
	 * {@glink examples/enterkey example}.
	 *
	 *		// Not recommended.
	 *		config.enterMode = CKEDITOR.ENTER_BR;
	 *
	 * @cfg {Number} [=CKEDITOR.ENTER_P]
	 */
	enterMode: CKEDITOR.ENTER_P,

	/**
	 * Forces the use of {@link CKEDITOR.config#enterMode} as line break regardless
	 * of the context. If, for example, {@link CKEDITOR.config#enterMode} is set
	 * to {@link CKEDITOR#ENTER_P}, pressing the <kbd>Enter</kbd> key inside a
	 * `<div>` element will create a new paragraph with a `<p>`
	 * instead of a `<div>`.
	 *
	 * Read more in the {@glink features/enterkey documentation} and see the
	 * {@glink examples/enterkey example}.
	 *
	 *		// Not recommended.
	 *		config.forceEnterMode = true;
	 *
	 * @since 3.2.1
	 * @cfg
	 */
	forceEnterMode: false,

	/**
	 * Similarly to the {@link CKEDITOR.config#enterMode} setting, it defines the behavior
	 * of the <kbd>Shift+Enter</kbd> key combination.
	 *
	 * The allowed values are the following constants that cause the behavior outlined below:
	 *
	 * * {@link CKEDITOR#ENTER_P} (1) &ndash; New `<p>` paragraphs are created.
	 * * {@link CKEDITOR#ENTER_BR} (2) &ndash; Lines are broken with `<br>` elements.
	 * * {@link CKEDITOR#ENTER_DIV} (3) &ndash; New `<div>` blocks are created.
	 *
	 * Read more in the {@glink features/enterkey documentation} and see the
	 * {@glink examples/enterkey example}.
	 *
	 * Example:
	 *
	 *		config.shiftEnterMode = CKEDITOR.ENTER_P;
	 *
	 * @cfg {Number} [=CKEDITOR.ENTER_BR]
	 */
	shiftEnterMode: CKEDITOR.ENTER_BR,

	/**
	 * Sets the `DOCTYPE` to be used when loading the editor content as HTML.
	 *
	 *		// Set the DOCTYPE to the HTML 4 (Quirks) mode.
	 *		config.docType = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">';
	 *
	 * @cfg
	 */
	docType: '<!DOCTYPE html>',

	/**
	 * Sets the `id` attribute to be used on the `body` element
	 * of the editing area. This can be useful when you intend to reuse the original CSS
	 * file you are using on your live website and want to assign the editor the same ID
	 * as the section that will include the contents. In this way ID-specific CSS rules will
	 * be enabled.
	 *
	 *		config.bodyId = 'contents_id';
	 *
	 * @since 3.1.0
	 * @cfg
	 */
	bodyId: '',

	/**
	 * Sets the `class` attribute to be used on the `body` element
	 * of the editing area. This can be useful when you intend to reuse the original CSS
	 * file you are using on your live website and want to assign the editor the same class
	 * as the section that will include the contents. In this way class-specific CSS rules will
	 * be enabled.
	 *
	 *		config.bodyClass = 'contents';
	 *
	 * **Note:** The editor needs to load stylesheets containing contents styles. You can either
	 * copy them to the `contents.css` file that the editor loads by default or set the {@link #contentsCss}
	 * option.
	 *
	 * **Note:** This setting only applies to {@glink guide/dev_framed classic editor} (the one that uses `iframe`).
	 *
	 * @since 3.1.0
	 * @cfg
	 */
	bodyClass: '',

	/**
	 * Indicates whether the content to be edited is being input as a full HTML page.
	 * A full page includes the `<html>`, `<head>`, and `<body>` elements.
	 * The final output will also reflect this setting, including the
	 * `<body>` content only if this setting is disabled.
	 *
	 * Read more in the {@glink features/fullpage documentation} and see the
	 * {@glink examples/fullpage example}.
	 *
	 *		config.fullPage = true;
	 *
	 * @since 3.1.0
	 * @cfg
	 */
	fullPage: false,

	/**
	 * The height of the editing area that includes the editor content. This configuration
	 * option accepts an integer (to denote a value in pixels) or any CSS-defined length unit
	 * except percent (`%`) values which are not supported.
	 *
	 * **Note:** This configuration option is ignored by {@glink guide/dev_inline inline editor}.
	 *
	 * Read more in the {@glink features/size documentation} and see the
	 * {@glink examples/size example}.
	 *
	 *		config.height = 500;		// 500 pixels.
	 *		config.height = '25em';		// CSS length.
	 *		config.height = '300px';	// CSS length.
	 *
	 * @cfg {Number/String}
	 */
	height: 200,

	/**
	 * The CSS file(s) to be used to apply style to editor content. It should
	 * reflect the CSS used in the target pages where the content is to be
	 * displayed.
	 *
	 * **Note:** This configuration value is ignored by {@glink guide/dev_inline inline editor}
	 * as it uses the styles that come directly from the page that CKEditor is
	 * rendered on. It is also ignored in the {@link #fullPage full page mode} in
	 * which the developer has full control over the page HTML code.
	 *
	 * Read more in the {@glink features/styles documentation} and see the
	 * {@glink examples/styles example}.
	 *
	 *		config.contentsCss = '/css/mysitestyles.css';
	 *		config.contentsCss = [ '/css/mysitestyles.css', '/css/anotherfile.css' ];
	 *
	 * @cfg {String/Array} [contentsCss=CKEDITOR.getUrl( 'contents.css' )]
	 */
	contentsCss: CKEDITOR.getUrl( 'contents.css' ),

	/**
	 * Comma-separated list of plugins to be used in an editor instance. Note that
	 * the actual plugins that are to be loaded could still be affected by two other settings:
	 * {@link CKEDITOR.config#extraPlugins} and {@link CKEDITOR.config#removePlugins}.
	 *
	 * @cfg {String/String[]} [="<default list of plugins>"]
	 */

	/**
	 * A list of additional plugins to be loaded. This setting makes it easier
	 * to add new plugins without having to touch the {@link CKEDITOR.config#plugins} setting.
	 *
	 * **Note:** The most recommended way to
	 * [add CKEditor plugins](https://ckeditor.com/docs/ckeditor4/latest/guide/dev_plugins.html) is through
	 * [CKEditor Builder](https://ckeditor.com/cke4/builder). Read more in the
	 * {@glink guide/dev_plugins documentation}.
	 *
	 *		config.extraPlugins = 'myplugin,anotherplugin';
	 *
	 * @cfg {String/String[]}
	 */
	extraPlugins: '',

	/**
	 * A list of plugins that must not be loaded. This setting makes it possible
	 * to avoid loading some plugins defined in the {@link CKEDITOR.config#plugins}
	 * setting without having to touch it.
	 *
	 * **Note:** A plugin required by another plugin cannot be removed and will cause
	 * an error to be thrown. So for example if `contextmenu` is required by `tabletools`,
	 * it can only be removed if `tabletools` is not loaded.
	 *
	 *		config.removePlugins = 'elementspath,save,font';
	 *
	 * @cfg {String/String[]}
	 */
	removePlugins: '',

	/**
	 * A list of regular expressions to be executed on input HTML,
	 * indicating HTML source code that when matched, must **not** be available in the WYSIWYG
	 * mode for editing.
	 *
	 *		config.protectedSource.push( /<\?[\s\S]*?\?>/g );											// PHP code
	 *		config.protectedSource.push( /<%[\s\S]*?%>/g );												// ASP code
	 *		config.protectedSource.push( /(<asp:[^\>]+>[\s|\S]*?<\/asp:[^\>]+>)|(<asp:[^\>]+\/>)/gi );	// ASP.NET code
	 *
	 * @cfg
	 */
	protectedSource: [],

	/**
	 * The editor `tabindex` value.
	 *
	 * Read more in the {@glink features/tabindex documentation} and see the
	 * {@glink examples/tabindex example}.
	 *
	 *		config.tabIndex = 1;
	 *
	 * @cfg
	 */
	tabIndex: 0,

	/**
	 * The editor UI outer width. This configuration option accepts an integer
	 * (to denote a value in pixels) or any CSS-defined length unit.
	 *
	 * Unlike the {@link CKEDITOR.config#height} setting, this
	 * one will set the outer width of the entire editor UI, not for the
	 * editing area only.
	 *
	 * **Note:** This configuration option is ignored by {@glink guide/dev_inline inline editor}.
	 *
	 * Read more in the {@glink features/size documentation} and see the
	 * {@glink examples/size example}.
	 *
	 *		config.width = 850;		// 850 pixels wide.
	 *		config.width = '75%';	// CSS unit.
	 *
	 * @cfg {String/Number}
	 */
	width: '',

	/**
	 * The base Z-index for floating dialog windows and popups.
	 *
	 *		config.baseFloatZIndex = 2000;
	 *
	 * @cfg
	 */
	baseFloatZIndex: 10000,

	/**
	 * The keystrokes that are blocked by default as the browser implementation
	 * is buggy. These default keystrokes are handled by the editor.
	 *
	 *		// Default setting.
	 *		config.blockedKeystrokes = [
	 *			CKEDITOR.CTRL + 66, // Ctrl+B
	 *			CKEDITOR.CTRL + 73, // Ctrl+I
	 *			CKEDITOR.CTRL + 85 // Ctrl+U
	 *		];
	 *
	 * @cfg {Array} [blockedKeystrokes=see example]
	 */
	blockedKeystrokes: [
		CKEDITOR.CTRL + 66, // Ctrl+B
		CKEDITOR.CTRL + 73, // Ctrl+I
		CKEDITOR.CTRL + 85 // Ctrl+U
	]
};

/**
 * Indicates that some of the editor features, like alignment and text
 * direction, should use the "computed value" of the feature to indicate its
 * on/off state instead of using the "real value".
 *
 * If enabled in a Left-To-Right written document, the "Left Justify"
 * alignment button will be shown as active, even if the alignment style is not
 * explicitly applied to the current paragraph in the editor.
 *
 *		config.useComputedState = false;
 *
 * @since 3.4.0
 * @cfg {Boolean} [useComputedState=true]
 */

/**
 * The base user interface color to be used by the editor. Not all skins are
 * {@glink guide/skin_sdk_chameleon compatible with this setting}.
 *
 * Read more in the {@glink features/uicolor documentation} and see the
 * {@glink examples/uicolor example}.
 *
 *		// Using a color code.
 *		config.uiColor = '#AADC6E';
 *
 *		// Using an HTML color name.
 *		config.uiColor = 'Gold';
 *
 * @cfg {String} uiColor
 */

// PACKAGER_RENAME( CKEDITOR.config )

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

( function() {
	'use strict';

	var DTD = CKEDITOR.dtd,
		// processElement flag - means that element has been somehow modified.
		FILTER_ELEMENT_MODIFIED = 1,
		// processElement flag - meaning explained in CKEDITOR.FILTER_SKIP_TREE doc.
		FILTER_SKIP_TREE = 2,
		copy = CKEDITOR.tools.copy,
		trim = CKEDITOR.tools.trim,
		TEST_VALUE = 'cke-test',
		enterModeTags = [ '', 'p', 'br', 'div' ];

	/**
	 * A flag indicating that the current element and all its ancestors
	 * should not be filtered.
	 *
	 * See {@link CKEDITOR.filter#addElementCallback} for more details.
	 *
	 * @since 4.4.0
	 * @readonly
	 * @property {Number} [=2]
	 * @member CKEDITOR
	 */
	CKEDITOR.FILTER_SKIP_TREE = FILTER_SKIP_TREE;

	/**
	 * Highly configurable class which implements input data filtering mechanisms
	 * and core functions used for the activation of editor features.
	 *
	 * A filter instance is always available under the {@link CKEDITOR.editor#filter}
	 * property and is used by the editor in its core features like filtering input data,
	 * applying data transformations, validating whether a feature may be enabled for
	 * the current setup. It may be configured in two ways:
	 *
	 *	* By the user, with the {@link CKEDITOR.config#allowedContent} setting.
	 *	* Automatically, by loaded features (toolbar items, commands, etc.).
	 *
	 * In both cases additional allowed content rules may be added by
	 * setting the {@link CKEDITOR.config#extraAllowedContent}
	 * configuration option.
	 *
	 * **Note**: Filter rules will be extended with the following elements
	 * depending on the {@link CKEDITOR.config#enterMode} and
	 * {@link CKEDITOR.config#shiftEnterMode} settings:
	 *
	 *	* `'p'` &ndash; for {@link CKEDITOR#ENTER_P},
	 *	* `'div'` &ndash; for {@link CKEDITOR#ENTER_DIV},
	 *	* `'br'` &ndash; for {@link CKEDITOR#ENTER_BR}.
	 *
	 * **Read more** about Advanced Content Filter in {@glink guide/dev_advanced_content_filter guides}.
	 *
	 * A filter may also be used as a standalone instance by passing
	 * {@link CKEDITOR.filter.allowedContentRules} instead of {@link CKEDITOR.editor}
	 * to the constructor:
	 *
	 * ```javascript
	 * var filter = new CKEDITOR.filter( 'b' );
	 *
	 * filter.check( 'b' ); // -> true
	 * filter.check( 'i' ); // -> false
	 * filter.allow( 'i' );
	 * filter.check( 'i' ); // -> true
	 * ```
	 *
	 * If the filter is only used by a single editor instance, you should pass the editor instance alongside with the rules.
	 * Passing the editor as the first parameter binds it with the filter so the filter can be removed
	 * with the {@link CKEDITOR.editor#method-destroy} method to prevent memory leaks.
	 *
	 * ```javascript
	 * // In both cases the filter will be removed during the {@link CKEDITOR.editor#method-destroy} function execution.
	 * var filter1 = new CKEDITOR.filter( editor );
	 * var filter2 = new CKEDITOR.filter( editor, 'b' );
	 * ```
	 *
	 * @since 4.1.0
	 * @class
	 * @constructor Creates a filter class instance.
	 * @param {CKEDITOR.editor/CKEDITOR.filter.allowedContentRules} editorOrRules
	 * @param {CKEDITOR.filter.allowedContentRules} [rules] This parameter is available since 4.11.0.
	 */
	CKEDITOR.filter = function( editorOrRules, rules ) {
		/**
		 * Whether custom {@link CKEDITOR.config#allowedContent} was set.
		 *
		 * This property does not apply to the standalone filter.
		 *
		 * @readonly
		 * @property {Boolean} customConfig
		 */

		/**
		 * Array of rules added by the {@link #allow} method (including those
		 * loaded from {@link CKEDITOR.config#allowedContent} and
		 * {@link CKEDITOR.config#extraAllowedContent}).
		 *
		 * Rules in this array are in unified allowed content rules format.
		 *
		 * This property is useful for debugging issues with rules string parsing
		 * or for checking which rules were automatically added by editor features.
		 *
		 * @readonly
		 */
		this.allowedContent = [];

		/**
		 * Array of rules added by the {@link #disallow} method (including those
		 * loaded from {@link CKEDITOR.config#disallowedContent}).
		 *
		 * Rules in this array are in unified disallowed content rules format.
		 *
		 * This property is useful for debugging issues with rules string parsing
		 * or for checking which rules were automatically added by editor features.
		 *
		 * @since 4.4.0
		 * @readonly
		 */
		this.disallowedContent = [];

		/**
		 * Array of element callbacks. See {@link #addElementCallback}.
		 *
		 * @readonly
		 * @property {Function[]} [=null]
		 */
		this.elementCallbacks = null;

		/**
		 * Whether the filter is disabled.
		 *
		 * To disable the filter, set {@link CKEDITOR.config#allowedContent} to `true`
		 * or use the {@link #disable} method.
		 *
		 * @readonly
		 */
		this.disabled = false;

		/**
		 * Editor instance if not a standalone filter.
		 *
		 * @readonly
		 * @property {CKEDITOR.editor} [=null]
		 */
		this.editor = null;

		/**
		 * Filter's unique id. It can be used to find filter instance in
		 * {@link CKEDITOR.filter#instances CKEDITOR.filter.instance} object.
		 *
		 * @since 4.3.0
		 * @readonly
		 * @property {Number} id
		 */
		this.id = CKEDITOR.tools.getNextNumber();

		this._ = {
			// Optimized allowed content rules.
			allowedRules: {
				elements: {},
				generic: []
			},
			// Optimized disallowed content rules.
			disallowedRules: {
				elements: {},
				generic: []
			},
			// Object: element name => array of transformations groups.
			transformations: {},
			cachedTests: {},
			cachedChecks: {}
		};

		// Register filter instance.
		CKEDITOR.filter.instances[ this.id ] = this;

		var editor = this.editor = editorOrRules instanceof CKEDITOR.editor ? editorOrRules : null;

		if ( editor && !rules ) {
			this.customConfig = true;

			var allowedContent = editor.config.allowedContent;

			// Disable filter completely by setting config.allowedContent = true.
			if ( allowedContent === true ) {
				this.disabled = true;
				return;
			}

			if ( !allowedContent )
				this.customConfig = false;

			this.allow( allowedContent, 'config', 1 );
			this.allow( editor.config.extraAllowedContent, 'extra', 1 );

			// Enter modes should extend filter rules (ENTER_P adds 'p' rule, etc.).
			this.allow( enterModeTags[ editor.enterMode ] + ' ' + enterModeTags[ editor.shiftEnterMode ], 'default', 1 );

			this.disallow( editor.config.disallowedContent );
		}
		// Rules object passed in editorOrRules argument - initialize standalone filter.
		else {
			this.customConfig = false;
			this.allow( rules || editorOrRules, 'default', 1 );
		}
	};

	/**
	 * Object containing all filter instances stored under their
	 * {@link #id} properties.
	 *
	 *		var filter = new CKEDITOR.filter( 'p' );
	 *		filter === CKEDITOR.filter.instances[ filter.id ];
	 *
	 * @since 4.3.0
	 * @static
	 * @property instances
	 */
	CKEDITOR.filter.instances = {};

	CKEDITOR.filter.prototype = {
		/**
		 * Adds allowed content rules to the filter.
		 *
		 * Read about rules formats in {@glink guide/dev_allowed_content_rules Allowed Content Rules guide}.
		 *
		 *		// Add a basic rule for custom image feature (e.g. 'MyImage' button).
		 *		editor.filter.allow( 'img[!src,alt]', 'MyImage' );
		 *
		 *		// Add rules for two header styles allowed by 'HeadersCombo'.
		 *		var header1Style = new CKEDITOR.style( { element: 'h1' } ),
		 *			header2Style = new CKEDITOR.style( { element: 'h2' } );
		 *		editor.filter.allow( [ header1Style, header2Style ], 'HeadersCombo' );
		 *
		 * @param {CKEDITOR.filter.allowedContentRules} newRules Rule(s) to be added.
		 * @param {String} [featureName] Name of a feature that allows this content (most often plugin/button/command name).
		 * @param {Boolean} [overrideCustom] By default this method will reject any rules
		 * if {@link CKEDITOR.config#allowedContent} is defined to avoid overriding it.
		 * Pass `true` to force rules addition.
		 * @returns {Boolean} Whether the rules were accepted.
		 */
		allow: function( newRules, featureName, overrideCustom ) {
			// Check arguments and constraints. Clear cache.
			if ( !beforeAddingRule( this, newRules, overrideCustom ) )
				return false;

			var i, ret;

			if ( typeof newRules == 'string' )
				newRules = parseRulesString( newRules );
			else if ( newRules instanceof CKEDITOR.style ) {
				// If style has the cast method defined, use it and abort.
				if ( newRules.toAllowedContentRules )
					return this.allow( newRules.toAllowedContentRules( this.editor ), featureName, overrideCustom );

				newRules = convertStyleToRules( newRules );
			} else if ( CKEDITOR.tools.isArray( newRules ) ) {
				for ( i = 0; i < newRules.length; ++i )
					ret = this.allow( newRules[ i ], featureName, overrideCustom );
				return ret; // Return last status.
			}

			addAndOptimizeRules( this, newRules, featureName, this.allowedContent, this._.allowedRules );

			return true;
		},

		/**
		 * Applies this filter to passed {@link CKEDITOR.htmlParser.fragment} or {@link CKEDITOR.htmlParser.element}.
		 * The result of filtering is a DOM tree without disallowed content.
		 *
		 *			// Create standalone filter passing 'p' and 'b' elements.
		 *		var filter = new CKEDITOR.filter( 'p b' ),
		 *			// Parse HTML string to pseudo DOM structure.
		 *			fragment = CKEDITOR.htmlParser.fragment.fromHtml( '<p><b>foo</b> <i>bar</i></p>' ),
		 *			writer = new CKEDITOR.htmlParser.basicWriter();
		 *
		 *		filter.applyTo( fragment );
		 *		fragment.writeHtml( writer );
		 *		writer.getHtml(); // -> '<p><b>foo</b> bar</p>'
		 *
		 * @param {CKEDITOR.htmlParser.fragment/CKEDITOR.htmlParser.element} fragment Node to be filtered.
		 * @param {Boolean} [toHtml] Set to `true` if the filter is used together with {@link CKEDITOR.htmlDataProcessor#toHtml}.
		 * @param {Boolean} [transformOnly] If set to `true` only transformations will be applied. Content
		 * will not be filtered with allowed content rules.
		 * @param {Number} [enterMode] Enter mode used by the filter when deciding how to strip disallowed element.
		 * Defaults to {@link CKEDITOR.editor#activeEnterMode} for a editor's filter or to {@link CKEDITOR#ENTER_P} for standalone filter.
		 * @returns {Boolean} Whether some part of the `fragment` was removed by the filter.
		 */
		applyTo: function( fragment, toHtml, transformOnly, enterMode ) {
			if ( this.disabled )
				return false;

			var that = this,
				toBeRemoved = [],
				protectedRegexs = this.editor && this.editor.config.protectedSource,
				processRetVal,
				isModified = false,
				filterOpts = {
					doFilter: !transformOnly,
					doTransform: true,
					doCallbacks: true,
					toHtml: toHtml
				};

			// Filter all children, skip root (fragment or editable-like wrapper used by data processor).
			fragment.forEach( function( el ) {
				if ( el.type == CKEDITOR.NODE_ELEMENT ) {
					// Do not filter element with data-cke-filter="off" and all their descendants.
					if ( el.attributes[ 'data-cke-filter' ] == 'off' )
						return false;

					// (https://dev.ckeditor.com/ticket/10260) Don't touch elements like spans with data-cke-* attribute since they're
					// responsible e.g. for placing markers, bookmarks, odds and stuff.
					// We love 'em and we don't wanna lose anything during the filtering.
					// '|' is to avoid tricky joints like data-="foo" + cke-="bar". Yes, they're possible.
					//
					// NOTE: data-cke-* assigned elements are preserved only when filter is used with
					//       htmlDataProcessor.toHtml because we don't want to protect them when outputting data
					//       (toDataFormat).
					if ( toHtml && el.name == 'span' && ~CKEDITOR.tools.object.keys( el.attributes ).join( '|' ).indexOf( 'data-cke-' ) )
						return;

					processRetVal = processElement( that, el, toBeRemoved, filterOpts );
					if ( processRetVal & FILTER_ELEMENT_MODIFIED )
						isModified = true;
					else if ( processRetVal & FILTER_SKIP_TREE )
						return false;
				}
				else if ( el.type == CKEDITOR.NODE_COMMENT && el.value.match( /^\{cke_protected\}(?!\{C\})/ ) ) {
					if ( !processProtectedElement( that, el, protectedRegexs, filterOpts ) )
						toBeRemoved.push( el );
				}
			}, null, true );

			if ( toBeRemoved.length )
				isModified = true;

			var node, element, check,
				toBeChecked = [],
				enterTag = enterModeTags[ enterMode || ( this.editor ? this.editor.enterMode : CKEDITOR.ENTER_P ) ],
				parentDtd;

			// Remove elements in reverse order - from leaves to root, to avoid conflicts.
			while ( ( node = toBeRemoved.pop() ) ) {
				if ( node.type == CKEDITOR.NODE_ELEMENT )
					removeElement( node, enterTag, toBeChecked );
				// This is a comment securing rejected element - remove it completely.
				else
					node.remove();
			}

			// Check elements that have been marked as possibly invalid.
			while ( ( check = toBeChecked.pop() ) ) {
				element = check.el;
				// Element has been already removed.
				if ( !element.parent )
					continue;

				// Handle custom elements as inline elements (https://dev.ckeditor.com/ticket/12683).
				parentDtd = DTD[ element.parent.name ] || DTD.span;

				switch ( check.check ) {
					// Check if element itself is correct.
					case 'it':
						// Check if element included in $removeEmpty has no children.
						if ( DTD.$removeEmpty[ element.name ] && !element.children.length )
							removeElement( element, enterTag, toBeChecked );
						// Check if that is invalid element.
						else if ( !validateElement( element ) )
							removeElement( element, enterTag, toBeChecked );
						break;

					// Check if element is in correct context. If not - remove element.
					case 'el-up':
						// Check if e.g. li is a child of body after ul has been removed.
						if ( element.parent.type != CKEDITOR.NODE_DOCUMENT_FRAGMENT && !parentDtd[ element.name ] )
							removeElement( element, enterTag, toBeChecked );
						break;

					// Check if element is in correct context. If not - remove parent.
					case 'parent-down':
						if ( element.parent.type != CKEDITOR.NODE_DOCUMENT_FRAGMENT && !parentDtd[ element.name ] )
							removeElement( element.parent, enterTag, toBeChecked );
						break;
				}
			}

			return isModified;
		},

		/**
		 * Checks whether a {@link CKEDITOR.feature} can be enabled. Unlike {@link #addFeature},
		 * this method always checks the feature, even when the default configuration
		 * for {@link CKEDITOR.config#allowedContent} is used.
		 *
		 *		// TODO example
		 *
		 * @param {CKEDITOR.feature} feature The feature to be tested.
		 * @returns {Boolean} Whether this feature can be enabled.
		 */
		checkFeature: function( feature ) {
			if ( this.disabled )
				return true;

			if ( !feature )
				return true;

			// Some features may want to register other features.
			// E.g. a button may return a command bound to it.
			if ( feature.toFeature )
				feature = feature.toFeature( this.editor );

			return !feature.requiredContent || this.check( feature.requiredContent );
		},

		/**
		 * Disables Advanced Content Filter.
		 *
		 * This method is meant to be used by plugins which are not
		 * compatible with the filter and in other cases in which the filter
		 * has to be disabled during the initialization phase or runtime.
		 *
		 * In other cases the filter can be disabled by setting
		 * {@link CKEDITOR.config#allowedContent} to `true`.
		 */
		disable: function() {
			this.disabled = true;
		},

		/**
		 * Adds disallowed content rules to the filter.
		 *
		 * Read about rules formats in the {@glink guide/dev_allowed_content_rules Allowed Content Rules guide}.
		 *
		 *		// Disallow all styles on the image elements.
		 *		editor.filter.disallow( 'img{*}' );
		 *
		 *		// Disallow all span and div elements.
		 *		editor.filter.disallow( 'span div' );
		 *
		 * @since 4.4.0
		 * @param {CKEDITOR.filter.disallowedContentRules} newRules Rule(s) to be added.
		 */
		disallow: function( newRules ) {
			// Check arguments and constraints. Clear cache.
			// Note: we pass true in the 3rd argument, because disallow() should never
			// be blocked by custom configuration.
			if ( !beforeAddingRule( this, newRules, true ) )
				return false;

			if ( typeof newRules == 'string' )
				newRules = parseRulesString( newRules );

			addAndOptimizeRules( this, newRules, null, this.disallowedContent, this._.disallowedRules );

			return true;
		},

		/**
		 * Adds an array of {@link CKEDITOR.feature} content forms. All forms
		 * will then be transformed to the first form which is allowed by the filter.
		 *
		 *		editor.filter.allow( 'i; span{!font-style}' );
		 *		editor.filter.addContentForms( [
		 *			'em',
		 *			'i',
		 *			[ 'span', function( el ) {
		 *				return el.styles[ 'font-style' ] == 'italic';
		 *			} ]
		 *		] );
		 *		// Now <em> and <span style="font-style:italic"> will be replaced with <i>
		 *		// because this is the first allowed form.
		 *		// <span> is allowed too, but it is the last form and
		 *		// additionaly, the editor cannot transform an element based on
		 *		// the array+function form).
		 *
		 * This method is used by the editor to register {@link CKEDITOR.feature#contentForms}
		 * when adding a feature with {@link #addFeature} or {@link CKEDITOR.editor#addFeature}.
		 *
		 * @param {Array} forms The content forms of a feature.
		 */
		addContentForms: function( forms ) {
			if ( this.disabled )
				return;

			if ( !forms )
				return;

			var i, form,
				transfGroups = [],
				preferredForm;

			// First, find preferred form - this is, first allowed.
			for ( i = 0; i < forms.length && !preferredForm; ++i ) {
				form = forms[ i ];

				// Check only strings and styles - array format isn't supported by #check().
				if ( ( typeof form == 'string' || form instanceof CKEDITOR.style ) && this.check( form ) )
					preferredForm = form;
			}

			// This feature doesn't have preferredForm, so ignore it.
			if ( !preferredForm )
				return;

			for ( i = 0; i < forms.length; ++i )
				transfGroups.push( getContentFormTransformationGroup( forms[ i ], preferredForm ) );

			this.addTransformations( transfGroups );
		},

		/**
		 * Adds a callback which will be executed on every element
		 * that the filter reaches when filtering, before the element is filtered.
		 *
		 * By returning {@link CKEDITOR#FILTER_SKIP_TREE} it is possible to
		 * skip filtering of the current element and all its ancestors.
		 *
		 *		editor.filter.addElementCallback( function( el ) {
		 *			if ( el.hasClass( 'protected' ) )
		 *				return CKEDITOR.FILTER_SKIP_TREE;
		 *		} );
		 *
		 * **Note:** At this stage the element passed to the callback does not
		 * contain `attributes`, `classes`, and `styles` properties which are available
		 * temporarily on later stages of the filtering process. Therefore you need to
		 *  use the pure {@link CKEDITOR.htmlParser.element} interface.
		 *
		 * @since 4.4.0
		 * @param {Function} callback The callback to be executed.
		 */
		addElementCallback: function( callback ) {
			// We want to keep it a falsy value, to speed up finding whether there are any callbacks.
			if ( !this.elementCallbacks )
				this.elementCallbacks = [];

			this.elementCallbacks.push( callback );
		},

		/**
		 * Checks whether a feature can be enabled for the HTML restrictions in place
		 * for the current CKEditor instance, based on the HTML code the feature might
		 * generate and the minimal HTML code the feature needs to be able to generate.
		 *
		 *		// TODO example
		 *
		 * @param {CKEDITOR.feature} feature
		 * @returns {Boolean} Whether this feature can be enabled.
		 */
		addFeature: function( feature ) {
			if ( this.disabled )
				return true;

			if ( !feature )
				return true;

			// Some features may want to register other features.
			// E.g. a button may return a command bound to it.
			if ( feature.toFeature )
				feature = feature.toFeature( this.editor );

			// If default configuration (will be checked inside #allow()),
			// then add allowed content rules.
			this.allow( feature.allowedContent, feature.name );

			this.addTransformations( feature.contentTransformations );
			this.addContentForms( feature.contentForms );

			// If custom configuration or any DACRs, then check if required content is allowed.
			if ( feature.requiredContent && ( this.customConfig || this.disallowedContent.length ) )
				return this.check( feature.requiredContent );

			return true;
		},

		/**
		 * Adds an array of content transformation groups. One group
		 * may contain many transformation rules, but only the first
		 * matching rule in a group is executed.
		 *
		 * A single transformation rule is an object with four properties:
		 *
		 *	* `check` (optional) &ndash; if set and {@link CKEDITOR.filter} does
		 *		not accept this {@link CKEDITOR.filter.contentRule}, this transformation rule
		 *		will not be executed (it does not *match*). This value is passed
		 *		to {@link #check}.
		 *	* `element` (optional) &ndash; this string property tells the filter on which
		 *		element this transformation can be run. It is optional, because
		 *		the element name can be obtained from `check` (if it is a String format)
		 *		or `left` (if it is a {@link CKEDITOR.style} instance).
		 *	* `left` (optional) &ndash; a function accepting an element or a {@link CKEDITOR.style}
		 *		instance verifying whether the transformation should be
		 *		executed on this specific element. If it returns `false` or if an element
		 *		does not match this style, this transformation rule does not *match*.
		 *	* `right` &ndash; a function accepting an element and {@link CKEDITOR.filter.transformationsTools}
		 *		or a string containing the name of the {@link CKEDITOR.filter.transformationsTools} method
		 *		that should be called on an element.
		 *
		 * A shorthand format is also available. A transformation rule can be defined by
		 * a single string `'check:right'`. The string before `':'` will be used as
		 * the `check` property and the second part as the `right` property.
		 *
		 * Transformation rules can be grouped. The filter will try to apply
		 * the first rule in a group. If it *matches*, the filter will ignore subsequent rules and
		 * will move to the next group. If it does not *match*, the next rule will be checked.
		 *
		 * Examples:
		 *
		 *		editor.filter.addTransformations( [
		 *			// First group.
		 *			[
		 *				// First rule. If table{width} is allowed, it
		 *				// executes {@link CKEDITOR.filter.transformationsTools#sizeToStyle} on a table element.
		 *				'table{width}: sizeToStyle',
		 *				// Second rule should not be executed if the first was.
		 *				'table[width]: sizeToAttribute'
		 *			],
		 *			// Second group.
		 *			[
		 *				// This rule will add the foo="1" attribute to all images that
		 *				// do not have it.
		 *				{
		 *					element: 'img',
		 *					left: function( el ) {
		 *						return !el.attributes.foo;
		 *					},
		 *					right: function( el, tools ) {
		 *						el.attributes.foo = '1';
		 *					}
		 *				}
		 *			]
		 *		] );
		 *
		 *		// Case 1:
		 *		// config.allowedContent = 'table{height,width}; tr td'.
		 *		//
		 *		// '<table style="height:100px; width:200px">...</table>'		-> '<table style="height:100px; width:200px">...</table>'
		 *		// '<table height="100" width="200">...</table>'				-> '<table style="height:100px; width:200px">...</table>'
		 *
		 *		// Case 2:
		 *		// config.allowedContent = 'table[height,width]; tr td'.
		 *		//
		 *		// '<table style="height:100px; width:200px">...</table>'		-> '<table height="100" width="200">...</table>'
		 *		// '<table height="100" width="200">...</table>'				-> '<table height="100" width="200"">...</table>'
		 *
		 *		// Case 3:
		 *		// config.allowedContent = 'table{width,height}[height,width]; tr td'.
		 *		//
		 *		// '<table style="height:100px; width:200px">...</table>'		-> '<table style="height:100px; width:200px">...</table>'
		 *		// '<table height="100" width="200">...</table>'				-> '<table style="height:100px; width:200px">...</table>'
		 *		//
		 *		// Note: Both forms are allowed (size set by style and by attributes), but only
		 *		// the first transformation is applied &mdash; the size is always transformed to a style.
		 *		// This is because only the first transformation matching allowed content rules is applied.
		 *
		 * This method is used by the editor to add {@link CKEDITOR.feature#contentTransformations}
		 * when adding a feature by {@link #addFeature} or {@link CKEDITOR.editor#addFeature}.
		 *
		 * @param {Array} transformations
		 */
		addTransformations: function( transformations ) {
			if ( this.disabled )
				return;

			if ( !transformations )
				return;

			var optimized = this._.transformations,
				group, i;

			for ( i = 0; i < transformations.length; ++i ) {
				group = optimizeTransformationsGroup( transformations[ i ] );

				if ( !optimized[ group.name ] )
					optimized[ group.name ] = [];

				optimized[ group.name ].push( group.rules );
			}
		},

		/**
		 * Checks whether the content defined in the `test` argument is allowed
		 * by this filter.
		 *
		 * If `strictCheck` is set to `false` (default value), this method checks
		 * if all parts of the `test` (styles, attributes, and classes) are
		 * accepted by the filter. If `strictCheck` is set to `true`, the test
		 * must also contain the required attributes, styles, and classes.
		 *
		 * For example:
		 *
		 *		// Rule: 'img[!src,alt]'.
		 *		filter.check( 'img[alt]' ); // -> true
		 *		filter.check( 'img[alt]', true, true ); // -> false
		 *
		 * Second `check()` call returned `false` because `src` is required.
		 *
		 * When an array of rules is passed as the `test` argument, the filter
		 * returns `true` if at least one of the passed rules is allowed.
		 *
		 * For example:
		 *
		 * ```js
		 * // Rule: 'img'
		 * filter.check( [ 'img', 'div' ] ) // -> true
		 * filter.check( [ 'p', 'div' ] ) // -> false
		 * ```
		 *
		 * **Note:** The `test` argument is of {@link CKEDITOR.filter.contentRule} type, which is
		 * a limited version of {@link CKEDITOR.filter.allowedContentRules}. Read more about it
		 * in the {@link CKEDITOR.filter.contentRule}'s documentation.
		 *
		 * @param {CKEDITOR.filter.contentRule/CKEDITOR.filter.contentRule[]} test
		 * @param {Boolean} [applyTransformations=true] Whether to use registered transformations.
		 * @param {Boolean} [strictCheck] Whether the filter should check if an element with exactly
		 * these properties is allowed.
		 * @returns {Boolean} Returns `true` if the content is allowed.
		 */
		check: function( test, applyTransformations, strictCheck ) {
			if ( this.disabled )
				return true;

			// If rules are an array, expand it and return the logical OR value of
			// the rules.
			if ( CKEDITOR.tools.isArray( test ) ) {
				for ( var i = test.length ; i-- ; ) {
					if ( this.check( test[ i ], applyTransformations, strictCheck ) )
						return true;
				}
				return false;
			}

			var element, result, cacheKey;

			if ( typeof test == 'string' ) {
				cacheKey = test + '<' + ( applyTransformations === false ? '0' : '1' ) + ( strictCheck ? '1' : '0' ) + '>';

				// Check if result of this check hasn't been already cached.
				if ( cacheKey in this._.cachedChecks )
					return this._.cachedChecks[ cacheKey ];

				// Create test element from string.
				element = mockElementFromString( test );
			} else {
				// Create test element from CKEDITOR.style.
				element = mockElementFromStyle( test );
			}

			// Make a deep copy.
			var clone = CKEDITOR.tools.clone( element ),
				toBeRemoved = [],
				transformations;

			// Apply transformations to original element.
			// Transformations will be applied to clone by the filter function.
			if ( applyTransformations !== false && ( transformations = this._.transformations[ element.name ] ) ) {
				for ( i = 0; i < transformations.length; ++i )
					applyTransformationsGroup( this, element, transformations[ i ] );

				// Transformations could modify styles or classes, so they need to be copied
				// to attributes object.
				updateAttributes( element );
			}

			// Filter clone of mocked element.
			processElement( this, clone, toBeRemoved, {
				doFilter: true,
				doTransform: applyTransformations !== false,
				skipRequired: !strictCheck,
				skipFinalValidation: !strictCheck
			} );

			// Element has been marked for removal.
			if ( toBeRemoved.length > 0 ) {
				result = false;
			}
			else {
				// We need to compare class alphabetically, because cloned element is created in such way (#727).
				var originClassNames = element.attributes[ 'class' ];
				if ( originClassNames ) {
					element.attributes[ 'class' ] = element.attributes[ 'class' ].split( ' ' ).sort().join( ' ' );
				}

				result = CKEDITOR.tools.objectCompare( element.attributes, clone.attributes, true );

				if ( originClassNames ) {
					element.attributes[ 'class' ] = originClassNames;
				}
			}

			// Cache result of this test - we can build cache only for string tests.
			if ( typeof test == 'string' )
				this._.cachedChecks[ cacheKey ] = result;

			return result;
		},

		/**
		 * Returns first enter mode allowed by this filter rules. Modes are checked in `p`, `div`, `br` order.
		 * If none of tags is allowed this method will return {@link CKEDITOR#ENTER_BR}.
		 *
		 * @since 4.3.0
		 * @param {Number} defaultMode The default mode which will be checked as the first one.
		 * @param {Boolean} [reverse] Whether to check modes in reverse order (used for shift enter mode).
		 * @returns {Number} Allowed enter mode.
		 */
		getAllowedEnterMode: ( function() {
			var tagsToCheck = [ 'p', 'div', 'br' ],
				enterModes = {
					p: CKEDITOR.ENTER_P,
					div: CKEDITOR.ENTER_DIV,
					br: CKEDITOR.ENTER_BR
				};

			return function( defaultMode, reverse ) {
				// Clone the array first.
				var tags = tagsToCheck.slice(),
					tag;

				// Check the default mode first.
				if ( this.check( enterModeTags[ defaultMode ] ) )
					return defaultMode;

				// If not reverse order, reverse array so we can pop() from it.
				if ( !reverse )
					tags = tags.reverse();

				while ( ( tag = tags.pop() ) ) {
					if ( this.check( tag ) )
						return enterModes[ tag ];
				}

				return CKEDITOR.ENTER_BR;
			};
		} )(),

		/**
		 * Returns a clone of this filter instance.
		 *
		 * @since 4.7.3
		 * @returns {CKEDITOR.filter}
		 */
		clone: function() {
			var ret = new CKEDITOR.filter(),
				clone = CKEDITOR.tools.clone;

			// Cloning allowed content related things.
			ret.allowedContent = clone( this.allowedContent );
			ret._.allowedRules = clone( this._.allowedRules );

			// Disallowed content rules.
			ret.disallowedContent = clone( this.disallowedContent );
			ret._.disallowedRules = clone( this._.disallowedRules );

			ret._.transformations = clone( this._.transformations );

			ret.disabled = this.disabled;
			ret.editor = this.editor;

			return ret;
		},

		/**
		 * Destroys the filter instance and removes it from the global {@link CKEDITOR.filter#instances} object.
		 *
		 * @since 4.4.5
		 */
		destroy: function() {
			delete CKEDITOR.filter.instances[ this.id ];
			// Deleting reference to filter instance should be enough,
			// but since these are big objects it's safe to clean them up too.
			delete this._;
			delete this.allowedContent;
			delete this.disallowedContent;
		}
	};

	function addAndOptimizeRules( that, newRules, featureName, standardizedRules, optimizedRules ) {
		var groupName, rule,
			rulesToOptimize = [];

		for ( groupName in newRules ) {
			rule = newRules[ groupName ];

			// { 'p h1': true } => { 'p h1': {} }.
			if ( typeof rule == 'boolean' )
				rule = {};
			// { 'p h1': func } => { 'p h1': { match: func } }.
			else if ( typeof rule == 'function' )
				rule = { match: rule };
			// Clone (shallow) rule, because we'll modify it later.
			else
				rule = copy( rule );

			// If this is not an unnamed rule ({ '$1' => { ... } })
			// move elements list to property.
			if ( groupName.charAt( 0 ) != '$' )
				rule.elements = groupName;

			if ( featureName )
				rule.featureName = featureName.toLowerCase();

			standardizeRule( rule );

			// Save rule and remember to optimize it.
			standardizedRules.push( rule );
			rulesToOptimize.push( rule );
		}

		optimizeRules( optimizedRules, rulesToOptimize );
	}

	// Apply ACR to an element.
	// @param rule
	// @param element
	// @param status Object containing status of element's filtering.
	// @param {Boolean} skipRequired If true don't check if element has all required properties.
	function applyAllowedRule( rule, element, status, skipRequired ) {
		// This rule doesn't match this element - skip it.
		if ( rule.match && !rule.match( element ) )
			return;

		// If element doesn't have all required styles/attrs/classes
		// this rule doesn't match it.
		if ( !skipRequired && !hasAllRequired( rule, element ) )
			return;

		// If this rule doesn't validate properties only mark element as valid.
		if ( !rule.propertiesOnly )
			status.valid = true;

		// Apply rule only when all attrs/styles/classes haven't been marked as valid.
		if ( !status.allAttributes )
			status.allAttributes = applyAllowedRuleToHash( rule.attributes, element.attributes, status.validAttributes );

		if ( !status.allStyles )
			status.allStyles = applyAllowedRuleToHash( rule.styles, element.styles, status.validStyles );

		if ( !status.allClasses )
			status.allClasses = applyAllowedRuleToArray( rule.classes, element.classes, status.validClasses );
	}

	// Apply itemsRule to items (only classes are kept in array).
	// Push accepted items to validItems array.
	// Return true when all items are valid.
	function applyAllowedRuleToArray( itemsRule, items, validItems ) {
		if ( !itemsRule )
			return false;

		// True means that all elements of array are accepted (the asterix was used for classes).
		if ( itemsRule === true )
			return true;

		for ( var i = 0, l = items.length, item; i < l; ++i ) {
			item = items[ i ];
			if ( !validItems[ item ] )
				validItems[ item ] = itemsRule( item );
		}

		return false;
	}

	function applyAllowedRuleToHash( itemsRule, items, validItems ) {
		if ( !itemsRule )
			return false;

		if ( itemsRule === true )
			return true;

		for ( var name in items ) {
			if ( !validItems[ name ] )
				validItems[ name ] = itemsRule( name );
		}

		return false;
	}

	// Apply DACR rule to an element.
	function applyDisallowedRule( rule, element, status ) {
		// This rule doesn't match this element - skip it.
		if ( rule.match && !rule.match( element ) )
			return;

		// No properties - it's an element only rule so it disallows entire element.
		// Early return is handled in filterElement.
		if ( rule.noProperties )
			return false;

		// Apply rule to attributes, styles and classes. Switch hadInvalid* to true if method returned true.
		status.hadInvalidAttribute = applyDisallowedRuleToHash( rule.attributes, element.attributes ) || status.hadInvalidAttribute;
		status.hadInvalidStyle = applyDisallowedRuleToHash( rule.styles, element.styles ) || status.hadInvalidStyle;
		status.hadInvalidClass = applyDisallowedRuleToArray( rule.classes, element.classes ) || status.hadInvalidClass;
	}

	// Apply DACR to items (only classes are kept in array).
	// @returns {Boolean} True if at least one of items was invalid (disallowed).
	function applyDisallowedRuleToArray( itemsRule, items ) {
		if ( !itemsRule )
			return false;

		var hadInvalid = false,
			allDisallowed = itemsRule === true;

		for ( var i = items.length; i--; ) {
			if ( allDisallowed || itemsRule( items[ i ] ) ) {
				items.splice( i, 1 );
				hadInvalid = true;
			}
		}

		return hadInvalid;
	}

	// Apply DACR to items (styles and attributes).
	// @returns {Boolean} True if at least one of items was invalid (disallowed).
	function applyDisallowedRuleToHash( itemsRule, items ) {
		if ( !itemsRule )
			return false;

		var hadInvalid = false,
			allDisallowed = itemsRule === true;

		for ( var name in items ) {
			if ( allDisallowed || itemsRule( name ) ) {
				delete items[ name ];
				hadInvalid = true;
			}
		}

		return hadInvalid;
	}

	function beforeAddingRule( that, newRules, overrideCustom ) {
		if ( that.disabled )
			return false;

		// Don't override custom user's configuration if not explicitly requested.
		if ( that.customConfig && !overrideCustom )
			return false;

		if ( !newRules )
			return false;

		// Clear cache, because new rules could change results of checks.
		that._.cachedChecks = {};

		return true;
	}

	// Convert CKEDITOR.style to filter's rule.
	function convertStyleToRules( style ) {
		var styleDef = style.getDefinition(),
			rules = {},
			rule,
			attrs = styleDef.attributes;

		rules[ styleDef.element ] = rule = {
			styles: styleDef.styles,
			requiredStyles: styleDef.styles && CKEDITOR.tools.object.keys( styleDef.styles )
		};

		if ( attrs ) {
			attrs = copy( attrs );
			rule.classes = attrs[ 'class' ] ? attrs[ 'class' ].split( /\s+/ ) : null;
			rule.requiredClasses = rule.classes;
			delete attrs[ 'class' ];
			rule.attributes = attrs;
			rule.requiredAttributes = attrs && CKEDITOR.tools.object.keys( attrs );
		}

		return rules;
	}

	// Convert all validator formats (string, array, object, boolean) to hash or boolean:
	// * true is returned for '*'/true validator,
	// * false is returned for empty validator (no validator at all (false/null) or e.g. empty array),
	// * object is returned in other cases.
	function convertValidatorToHash( validator, delimiter ) {
		if ( !validator )
			return false;

		if ( validator === true )
			return validator;

		if ( typeof validator == 'string' ) {
			validator = trim( validator );
			if ( validator == '*' )
				return true;
			else
				return CKEDITOR.tools.convertArrayToObject( validator.split( delimiter ) );
		}
		else if ( CKEDITOR.tools.isArray( validator ) ) {
			if ( validator.length )
				return CKEDITOR.tools.convertArrayToObject( validator );
			else
				return false;
		}
		// If object.
		else {
			var obj = {},
				len = 0;

			for ( var i in validator ) {
				obj[ i ] = validator[ i ];
				len++;
			}

			return len ? obj : false;
		}
	}

	function executeElementCallbacks( element, callbacks ) {
		for ( var i = 0, l = callbacks.length, retVal; i < l; ++i ) {
			if ( ( retVal = callbacks[ i ]( element ) ) )
				return retVal;
		}
	}

	// Extract required properties from "required" validator and "all" properties.
	// Remove exclamation marks from "all" properties.
	//
	// E.g.:
	// requiredClasses = { cl1: true }
	// (all) classes = { cl1: true, cl2: true, '!cl3': true }
	//
	// result:
	// returned = { cl1: true, cl3: true }
	// all = { cl1: true, cl2: true, cl3: true }
	//
	// This function returns false if nothing is required.
	function extractRequired( required, all ) {
		var unbang = [],
			empty = true,
			i;

		if ( required )
			empty = false;
		else
			required = {};

		for ( i in all ) {
			if ( i.charAt( 0 ) == '!' ) {
				i = i.slice( 1 );
				unbang.push( i );
				required[ i ] = true;
				empty = false;
			}
		}

		while ( ( i = unbang.pop() ) ) {
			all[ i ] = all[ '!' + i ];
			delete all[ '!' + i ];
		}

		return empty ? false : required;
	}

	// Does the actual filtering by appling allowed content rules
	// to the element.
	//
	// @param {CKEDITOR.filter} that The context.
	// @param {CKEDITOR.htmlParser.element} element
	// @param {Object} opts The same as in processElement.
	function filterElement( that, element, opts ) {
		var name = element.name,
			privObj = that._,
			allowedRules = privObj.allowedRules.elements[ name ],
			genericAllowedRules = privObj.allowedRules.generic,
			disallowedRules = privObj.disallowedRules.elements[ name ],
			genericDisallowedRules = privObj.disallowedRules.generic,
			skipRequired = opts.skipRequired,
			status = {
				// Whether any of rules accepted element.
				// If not - it will be stripped.
				valid: false,
				// Objects containing accepted attributes, classes and styles.
				validAttributes: {},
				validClasses: {},
				validStyles: {},
				// Whether all are valid.
				// If we know that all element's attrs/classes/styles are valid
				// we can skip their validation, to improve performance.
				allAttributes: false,
				allClasses: false,
				allStyles: false,
				// Whether element had (before applying DACRs) at least one invalid attribute/class/style.
				hadInvalidAttribute: false,
				hadInvalidClass: false,
				hadInvalidStyle: false
			},
			i, l;

		// Early return - if there are no rules for this element (specific or generic), remove it.
		if ( !allowedRules && !genericAllowedRules )
			return null;

		// Could not be done yet if there were no transformations and if this
		// is real (not mocked) object.
		populateProperties( element );

		// Note - this step modifies element's styles, classes and attributes.
		if ( disallowedRules ) {
			for ( i = 0, l = disallowedRules.length; i < l; ++i ) {
				// Apply rule and make an early return if false is returned what means
				// that element is completely disallowed.
				if ( applyDisallowedRule( disallowedRules[ i ], element, status ) === false )
					return null;
			}
		}

		// Note - this step modifies element's styles, classes and attributes.
		if ( genericDisallowedRules ) {
			for ( i = 0, l = genericDisallowedRules.length; i < l; ++i )
				applyDisallowedRule( genericDisallowedRules[ i ], element, status );
		}

		if ( allowedRules ) {
			for ( i = 0, l = allowedRules.length; i < l; ++i )
				applyAllowedRule( allowedRules[ i ], element, status, skipRequired );
		}

		if ( genericAllowedRules ) {
			for ( i = 0, l = genericAllowedRules.length; i < l; ++i )
				applyAllowedRule( genericAllowedRules[ i ], element, status, skipRequired );
		}

		return status;
	}

	// Check whether element has all properties (styles,classes,attrs) required by a rule.
	function hasAllRequired( rule, element ) {
		if ( rule.nothingRequired )
			return true;

		var i, req, reqs, existing;

		if ( ( reqs = rule.requiredClasses ) ) {
			existing = element.classes;
			for ( i = 0; i < reqs.length; ++i ) {
				req = reqs[ i ];
				if ( typeof req == 'string' ) {
					if ( CKEDITOR.tools.indexOf( existing, req ) == -1 )
						return false;
				}
				// This means regexp.
				else {
					if ( !CKEDITOR.tools.checkIfAnyArrayItemMatches( existing, req ) )
						return false;
				}
			}
		}

		return hasAllRequiredInHash( element.styles, rule.requiredStyles ) &&
			hasAllRequiredInHash( element.attributes, rule.requiredAttributes );
	}

	// Check whether all items in required (array) exist in existing (object).
	function hasAllRequiredInHash( existing, required ) {
		if ( !required )
			return true;

		for ( var i = 0, req; i < required.length; ++i ) {
			req = required[ i ];
			if ( typeof req == 'string' ) {
				if ( !( req in existing ) )
					return false;
			}
			// This means regexp.
			else {
				if ( !CKEDITOR.tools.checkIfAnyObjectPropertyMatches( existing, req ) )
					return false;
			}
		}

		return true;
	}

	// Create pseudo element that will be passed through filter
	// to check if tested string is allowed.
	function mockElementFromString( str ) {
		var element = parseRulesString( str ).$1,
			styles = element.styles,
			classes = element.classes;

		element.name = element.elements;
		element.classes = classes = ( classes ? classes.split( /\s*,\s*/ ) : [] );
		element.styles = mockHash( styles );
		element.attributes = mockHash( element.attributes );
		element.children = [];

		if ( classes.length )
			element.attributes[ 'class' ] = classes.join( ' ' );
		if ( styles )
			element.attributes.style = CKEDITOR.tools.writeCssText( element.styles );

		return element;
	}

	// Create pseudo element that will be passed through filter
	// to check if tested style is allowed.
	function mockElementFromStyle( style ) {
		var styleDef = style.getDefinition(),
			styles = styleDef.styles,
			attrs = styleDef.attributes || {};

		if ( styles && !CKEDITOR.tools.isEmpty( styles ) ) {
			styles = copy( styles );
			attrs.style = CKEDITOR.tools.writeCssText( styles, true );
		} else {
			styles = {};
		}

		return {
			name: styleDef.element,
			attributes: attrs,
			classes: attrs[ 'class' ] ? attrs[ 'class' ].split( /\s+/ ) : [],
			styles: styles,
			children: []
		};
	}

	// Mock hash based on string.
	// 'a,b,c' => { a: 'cke-test', b: 'cke-test', c: 'cke-test' }
	// Used to mock styles and attributes objects.
	function mockHash( str ) {
		// It may be a null or empty string.
		if ( !str )
			return {};

		var keys = str.split( /\s*,\s*/ ).sort(),
			obj = {};

		while ( keys.length )
			obj[ keys.shift() ] = TEST_VALUE;

		return obj;
	}

	// Extract properties names from the object
	// and replace those containing wildcards with regexps.
	// Note: there's a room for performance improvement. Array of mixed types
	// breaks JIT-compiler optiomization what may invalidate compilation of pretty a lot of code.
	//
	// @returns An array of strings and regexps.
	function optimizeRequiredProperties( requiredProperties ) {
		var arr = [];
		for ( var propertyName in requiredProperties ) {
			if ( propertyName.indexOf( '*' ) > -1 )
				arr.push( new RegExp( '^' + propertyName.replace( /\*/g, '.*' ) + '$' ) );
			else
				arr.push( propertyName );
		}
		return arr;
	}

	var validators = { styles: 1, attributes: 1, classes: 1 },
		validatorsRequired = {
			styles: 'requiredStyles',
			attributes: 'requiredAttributes',
			classes: 'requiredClasses'
		};

	// Optimize a rule by replacing validators with functions
	// and rewriting requiredXXX validators to arrays.
	function optimizeRule( rule ) {
		var validatorName,
			requiredProperties,
			i;

		for ( validatorName in validators )
			rule[ validatorName ] = validatorFunction( rule[ validatorName ] );

		var nothingRequired = true;
		for ( i in validatorsRequired ) {
			validatorName = validatorsRequired[ i ];
			requiredProperties = optimizeRequiredProperties( rule[ validatorName ] );
			// Don't set anything if there are no required properties. This will allow to
			// save some memory by GCing all empty arrays (requiredProperties).
			if ( requiredProperties.length ) {
				rule[ validatorName ] = requiredProperties;
				nothingRequired = false;
			}
		}

		rule.nothingRequired = nothingRequired;
		rule.noProperties = !( rule.attributes || rule.classes || rule.styles );
	}

	// Add optimized version of rule to optimizedRules object.
	function optimizeRules( optimizedRules, rules ) {
		var elementsRules = optimizedRules.elements,
			genericRules = optimizedRules.generic,
			i, l, rule, element, priority;

		for ( i = 0, l = rules.length; i < l; ++i ) {
			// Shallow copy. Do not modify original rule.
			rule = copy( rules[ i ] );
			priority = rule.classes === true || rule.styles === true || rule.attributes === true;
			optimizeRule( rule );

			// E.g. "*(xxx)[xxx]" - it's a generic rule that
			// validates properties only.
			// Or '$1': { match: function() {...} }
			if ( rule.elements === true || rule.elements === null ) {
				// Add priority rules at the beginning.
				genericRules[ priority ? 'unshift' : 'push' ]( rule );
			}
			// If elements list was explicitly defined,
			// add this rule for every defined element.
			else {
				// We don't need elements validator for this kind of rule.
				var elements = rule.elements;
				delete rule.elements;

				for ( element in elements ) {
					if ( !elementsRules[ element ] )
						elementsRules[ element ] = [ rule ];
					else
						elementsRules[ element ][ priority ? 'unshift' : 'push' ]( rule );
				}
			}
		}
	}

	//                  <   elements   ><                       styles, attributes and classes                        >< separator >
	var rulePattern = /^([a-z0-9\-*\s]+)((?:\s*\{[!\w\-,\s\*]+\}\s*|\s*\[[!\w\-,\s\*]+\]\s*|\s*\([!\w\-,\s\*]+\)\s*){0,3})(?:;\s*|$)/i,
		groupsPatterns = {
			styles: /{([^}]+)}/,
			attrs: /\[([^\]]+)\]/,
			classes: /\(([^\)]+)\)/
		};

	function parseRulesString( input ) {
		var match,
			props, styles, attrs, classes,
			rules = {},
			groupNum = 1;

		input = trim( input );

		while ( ( match = input.match( rulePattern ) ) ) {
			if ( ( props = match[ 2 ] ) ) {
				styles = parseProperties( props, 'styles' );
				attrs = parseProperties( props, 'attrs' );
				classes = parseProperties( props, 'classes' );
			} else {
				styles = attrs = classes = null;
			}

			// Add as an unnamed rule, because there can be two rules
			// for one elements set defined in string format.
			rules[ '$' + groupNum++ ] = {
				elements: match[ 1 ],
				classes: classes,
				styles: styles,
				attributes: attrs
			};

			// Move to the next group.
			input = input.slice( match[ 0 ].length );
		}

		return rules;
	}

	// Extract specified properties group (styles, attrs, classes) from
	// what stands after the elements list in string format of allowedContent.
	function parseProperties( properties, groupName ) {
		var group = properties.match( groupsPatterns[ groupName ] );
		return group ? trim( group[ 1 ] ) : null;
	}

	function populateProperties( element ) {
			// Backup styles and classes, because they may be removed by DACRs.
			// We'll need them in updateElement().
		var styles = element.styleBackup = element.attributes.style,
			classes = element.classBackup = element.attributes[ 'class' ];

		// Parse classes and styles if that hasn't been done before.
		if ( !element.styles )
			element.styles = CKEDITOR.tools.parseCssText( styles || '', 1 );
		if ( !element.classes )
			element.classes = classes ? classes.split( /\s+/ ) : [];
	}

	// Filter element protected with a comment.
	// Returns true if protected content is ok, false otherwise.
	function processProtectedElement( that, comment, protectedRegexs, filterOpts ) {
		var source = decodeURIComponent( comment.value.replace( /^\{cke_protected\}/, '' ) ),
			protectedFrag,
			toBeRemoved = [],
			node, i, match;

		// Protected element's and protected source's comments look exactly the same.
		// Check if what we have isn't a protected source instead of protected script/noscript.
		if ( protectedRegexs ) {
			for ( i = 0; i < protectedRegexs.length; ++i ) {
				if ( ( match = source.match( protectedRegexs[ i ] ) ) &&
					match[ 0 ].length == source.length	// Check whether this pattern matches entire source
														// to avoid '<script>alert("<? 1 ?>")</script>' matching
														// the PHP's protectedSource regexp.
				)
					return true;
			}
		}

		protectedFrag = CKEDITOR.htmlParser.fragment.fromHtml( source );

		if ( protectedFrag.children.length == 1 && ( node = protectedFrag.children[ 0 ] ).type == CKEDITOR.NODE_ELEMENT )
			processElement( that, node, toBeRemoved, filterOpts );

		// If protected element has been marked to be removed, return 'false' - comment was rejected.
		return !toBeRemoved.length;
	}

	var unprotectElementsNamesRegexp = /^cke:(object|embed|param)$/,
		protectElementsNamesRegexp = /^(object|embed|param)$/;

	// The actual function which filters, transforms and does other funny things with an element.
	//
	// @param {CKEDITOR.filter} that Context.
	// @param {CKEDITOR.htmlParser.element} element The element to be processed.
	// @param {Array} toBeRemoved Array into which elements rejected by the filter will be pushed.
	// @param {Boolean} [opts.doFilter] Whether element should be filtered.
	// @param {Boolean} [opts.doTransform] Whether transformations should be applied.
	// @param {Boolean} [opts.doCallbacks] Whether to execute element callbacks.
	// @param {Boolean} [opts.toHtml] Set to true if filter used together with htmlDP#toHtml
	// @param {Boolean} [opts.skipRequired] Whether element's required properties shouldn't be verified.
	// @param {Boolean} [opts.skipFinalValidation] Whether to not perform final element validation (a,img).
	// @returns {Number} Possible flags:
	//  * FILTER_ELEMENT_MODIFIED,
	//  * FILTER_SKIP_TREE.
	function processElement( that, element, toBeRemoved, opts ) {
		var status,
			retVal = 0,
			callbacksRetVal;

		// Unprotect elements names previously protected by htmlDataProcessor
		// (see protectElementNames and protectSelfClosingElements functions).
		// Note: body, title, etc. are not protected by htmlDataP (or are protected and then unprotected).
		if ( opts.toHtml )
			element.name = element.name.replace( unprotectElementsNamesRegexp, '$1' );

		// Execute element callbacks and return if one of them returned any value.
		if ( opts.doCallbacks && that.elementCallbacks ) {
			// For now we only support here FILTER_SKIP_TREE, so we can early return if retVal is truly value.
			if ( ( callbacksRetVal = executeElementCallbacks( element, that.elementCallbacks ) ) )
				return callbacksRetVal;
		}

		// If transformations are set apply all groups.
		if ( opts.doTransform )
			transformElement( that, element );

		if ( opts.doFilter ) {
			// Apply all filters.
			status = filterElement( that, element, opts );

			// Handle early return from filterElement.
			if ( !status ) {
				toBeRemoved.push( element );
				return FILTER_ELEMENT_MODIFIED;
			}

			// Finally, if after running all filter rules it still hasn't been allowed - remove it.
			if ( !status.valid ) {
				toBeRemoved.push( element );
				return FILTER_ELEMENT_MODIFIED;
			}

			// Update element's attributes based on status of filtering.
			if ( updateElement( element, status ) )
				retVal = FILTER_ELEMENT_MODIFIED;

			if ( !opts.skipFinalValidation && !validateElement( element ) ) {
				toBeRemoved.push( element );
				return FILTER_ELEMENT_MODIFIED;
			}
		}

		// Protect previously unprotected elements.
		if ( opts.toHtml )
			element.name = element.name.replace( protectElementsNamesRegexp, 'cke:$1' );

		return retVal;
	}

	// Returns a regexp object which can be used to test if a property
	// matches one of wildcard validators.
	function regexifyPropertiesWithWildcards( validators ) {
		var patterns = [],
			i;

		for ( i in validators ) {
			if ( i.indexOf( '*' ) > -1 )
				patterns.push( i.replace( /\*/g, '.*' ) );
		}

		if ( patterns.length )
			return new RegExp( '^(?:' + patterns.join( '|' ) + ')$' );
		else
			return null;
	}

	// Standardize a rule by converting all validators to hashes.
	function standardizeRule( rule ) {
		rule.elements = convertValidatorToHash( rule.elements, /\s+/ ) || null;
		rule.propertiesOnly = rule.propertiesOnly || ( rule.elements === true );

		var delim = /\s*,\s*/,
			i;

		for ( i in validators ) {
			rule[ i ] = convertValidatorToHash( rule[ i ], delim ) || null;
			rule[ validatorsRequired[ i ] ] = extractRequired( convertValidatorToHash(
				rule[ validatorsRequired[ i ] ], delim ), rule[ i ] ) || null;
		}

		rule.match = rule.match || null;
	}

	// Does the element transformation by applying registered
	// transformation rules.
	function transformElement( that, element ) {
		var transformations = that._.transformations[ element.name ],
			i;

		if ( !transformations )
			return;

		populateProperties( element );

		for ( i = 0; i < transformations.length; ++i )
			applyTransformationsGroup( that, element, transformations[ i ] );

		// Do not count on updateElement() which is called in processElement, because it:
		// * may not be called,
		// * may skip some properties when all are marked as valid.
		updateAttributes( element );
	}

	// Copy element's styles and classes back to attributes array.
	function updateAttributes( element ) {
		var attrs = element.attributes,
			styles;

		// Will be recreated later if any of styles/classes exists.
		delete attrs.style;
		delete attrs[ 'class' ];

		if ( ( styles = CKEDITOR.tools.writeCssText( element.styles, true ) ) )
			attrs.style = styles;

		if ( element.classes.length )
			attrs[ 'class' ] = element.classes.sort().join( ' ' );
	}

	// Update element object based on status of filtering.
	// @returns Whether element was modified.
	function updateElement( element, status ) {
		var validAttrs = status.validAttributes,
			validStyles = status.validStyles,
			validClasses = status.validClasses,
			attrs = element.attributes,
			styles = element.styles,
			classes = element.classes,
			origClasses = element.classBackup,
			origStyles = element.styleBackup,
			name, origName, i,
			stylesArr = [],
			classesArr = [],
			internalAttr = /^data-cke-/,
			isModified = false;

		// Will be recreated later if any of styles/classes were passed.
		delete attrs.style;
		delete attrs[ 'class' ];
		// Clean up.
		delete element.classBackup;
		delete element.styleBackup;

		if ( !status.allAttributes ) {
			for ( name in attrs ) {
				// If not valid and not internal attribute delete it.
				if ( !validAttrs[ name ] ) {
					// Allow all internal attibutes...
					if ( internalAttr.test( name ) ) {
						// ... unless this is a saved attribute and the original one isn't allowed.
						if ( name != ( origName = name.replace( /^data-cke-saved-/, '' ) ) &&
							!validAttrs[ origName ]
						) {
							delete attrs[ name ];
							isModified = true;
						}
					} else {
						delete attrs[ name ];
						isModified = true;
					}
				}

			}
		}

		if ( !status.allStyles || status.hadInvalidStyle ) {
			for ( name in styles ) {
				// We check status.allStyles because when there was a '*' ACR and some
				// DACR we have now both properties true - status.allStyles and status.hadInvalidStyle.
				// However unlike in the case when we only have '*' ACR, in which we can just copy original
				// styles, in this case we must copy only those styles which were not removed by DACRs.
				if ( status.allStyles || validStyles[ name ] )
					stylesArr.push( name + ':' + styles[ name ] );
				else
					isModified = true;
			}
			if ( stylesArr.length )
				attrs.style = stylesArr.sort().join( '; ' );
		}
		else if ( origStyles ) {
			attrs.style = origStyles;
		}

		if ( !status.allClasses || status.hadInvalidClass ) {
			for ( i = 0; i < classes.length; ++i ) {
				// See comment for styles.
				if ( status.allClasses || validClasses[ classes[ i ] ] )
					classesArr.push( classes[ i ] );
			}
			if ( classesArr.length )
				attrs[ 'class' ] = classesArr.sort().join( ' ' );

			if ( origClasses && classesArr.length < origClasses.split( /\s+/ ).length )
				isModified = true;
		}
		else if ( origClasses ) {
			attrs[ 'class' ] = origClasses;
		}

		return isModified;
	}

	function validateElement( element ) {
		switch ( element.name ) {
			case 'a':
				// Code borrowed from htmlDataProcessor, so ACF does the same clean up.
				if ( !( element.children.length || element.attributes.name || element.attributes.id ) )
					return false;
				break;
			case 'img':
				if ( !element.attributes.src )
					return false;
				break;
		}

		return true;
	}

	function validatorFunction( validator ) {
		if ( !validator )
			return false;
		if ( validator === true )
			return true;

		// Note: We don't need to remove properties with wildcards from the validator object.
		// E.g. data-* is actually an edge case of /^data-.*$/, so when it's accepted
		// by `value in validator` it's ok.
		var regexp = regexifyPropertiesWithWildcards( validator );

		return function( value ) {
			return value in validator || ( regexp && value.match( regexp ) );
		};
	}

	//
	// REMOVE ELEMENT ---------------------------------------------------------
	//

	// Check whether all children will be valid in new context.
	// Note: it doesn't verify if text node is valid, because
	// new parent should accept them.
	function checkChildren( children, newParentName ) {
		var allowed = DTD[ newParentName ];

		for ( var i = 0, l = children.length, child; i < l; ++i ) {
			child = children[ i ];
			if ( child.type == CKEDITOR.NODE_ELEMENT && !allowed[ child.name ] )
				return false;
		}

		return true;
	}

	function createBr() {
		return new CKEDITOR.htmlParser.element( 'br' );
	}

	// Whether this is an inline element or text.
	function inlineNode( node ) {
		return node.type == CKEDITOR.NODE_TEXT ||
			node.type == CKEDITOR.NODE_ELEMENT && DTD.$inline[ node.name ];
	}

	function isBrOrBlock( node ) {
		return node.type == CKEDITOR.NODE_ELEMENT &&
			( node.name == 'br' || DTD.$block[ node.name ] );
	}

	// Try to remove element in the best possible way.
	//
	// @param {Array} toBeChecked After executing this function
	// this array will contain elements that should be checked
	// because they were marked as potentially:
	// * in wrong context (e.g. li in body),
	// * empty elements from $removeEmpty,
	// * incorrect img/a/other element validated by validateElement().
	function removeElement( element, enterTag, toBeChecked ) {
		var name = element.name;

		if ( DTD.$empty[ name ] || !element.children.length ) {
			// Special case - hr in br mode should be replaced with br, not removed.
			if ( name == 'hr' && enterTag == 'br' )
				element.replaceWith( createBr() );
			else {
				// Parent might become an empty inline specified in $removeEmpty or empty a[href].
				if ( element.parent )
					toBeChecked.push( { check: 'it', el: element.parent } );

				element.remove();
			}
		} else if ( DTD.$block[ name ] || name == 'tr' ) {
			if ( enterTag == 'br' )
				stripBlockBr( element, toBeChecked );
			else
				stripBlock( element, enterTag, toBeChecked );
		}
		// Special case - elements that may contain CDATA should be removed completely.
		else if ( name in { style: 1, script: 1 } )
			element.remove();
		// The rest of inline elements. May also be the last resort
		// for some special elements.
		else {
			// Parent might become an empty inline specified in $removeEmpty or empty a[href].
			if ( element.parent )
				toBeChecked.push( { check: 'it', el: element.parent } );
			element.replaceWithChildren();
		}
	}

	// Strip element block, but leave its content.
	// Works in 'div' and 'p' enter modes.
	function stripBlock( element, enterTag, toBeChecked ) {
		var children = element.children;

		// First, check if element's children may be wrapped with <p/div>.
		// Ignore that <p/div> may not be allowed in element.parent.
		// This will be fixed when removing parent or by toBeChecked rule.
		if ( checkChildren( children, enterTag ) ) {
			element.name = enterTag;
			element.attributes = {};
			// Check if this p/div was put in correct context.
			// If not - strip parent.
			toBeChecked.push( { check: 'parent-down', el: element } );
			return;
		}

		var parent = element.parent,
			shouldAutoP = parent.type == CKEDITOR.NODE_DOCUMENT_FRAGMENT || parent.name == 'body',
			i, child, p, parentDtd;

		for ( i = children.length; i > 0; ) {
			child = children[ --i ];

			// If parent requires auto paragraphing and child is inline node,
			// insert this child into newly created paragraph.
			if ( shouldAutoP && inlineNode( child )  ) {
				if ( !p ) {
					p = new CKEDITOR.htmlParser.element( enterTag );
					p.insertAfter( element );

					// Check if this p/div was put in correct context.
					// If not - strip parent.
					toBeChecked.push( { check: 'parent-down', el: p } );
				}
				p.add( child, 0 );
			}
			// Child which doesn't need to be auto paragraphed.
			else {
				p = null;
				parentDtd = DTD[ parent.name ] || DTD.span;

				child.insertAfter( element );
				// If inserted into invalid context, mark it and check
				// after removing all elements.
				if ( parent.type != CKEDITOR.NODE_DOCUMENT_FRAGMENT &&
					child.type == CKEDITOR.NODE_ELEMENT &&
					!parentDtd[ child.name ]
				)
					toBeChecked.push( { check: 'el-up', el: child } );
			}
		}

		// All children have been moved to element's parent, so remove it.
		element.remove();
	}

	// Prepend/append block with <br> if isn't
	// already prepended/appended with <br> or block and
	// isn't first/last child of its parent.
	// Then replace element with its children.
	// <p>a</p><p>b</p> => <p>a</p><br>b => a<br>b
	function stripBlockBr( element ) {
		var br;

		if ( element.previous && !isBrOrBlock( element.previous ) ) {
			br = createBr();
			br.insertBefore( element );
		}

		if ( element.next && !isBrOrBlock( element.next ) ) {
			br = createBr();
			br.insertAfter( element );
		}

		element.replaceWithChildren();
	}

	//
	// TRANSFORMATIONS --------------------------------------------------------
	//
	var transformationsTools;

	// Apply given transformations group to the element.
	function applyTransformationsGroup( filter, element, group ) {
		var i, rule;

		for ( i = 0; i < group.length; ++i ) {
			rule = group[ i ];

			// Test with #check or #left only if it's set.
			// Do not apply transformations because that creates infinite loop.
			if ( ( !rule.check || filter.check( rule.check, false ) ) &&
				( !rule.left || rule.left( element ) ) ) {
				rule.right( element, transformationsTools );
				return; // Only first matching rule in a group is executed.
			}
		}
	}

	// Check whether element matches CKEDITOR.style.
	// The element can be a "superset" of style,
	// e.g. it may have more classes, but need to have
	// at least those defined in style.
	function elementMatchesStyle( element, style ) {
		var def = style.getDefinition(),
			defAttrs = def.attributes,
			defStyles = def.styles,
			attrName, styleName,
			classes, classPattern, cl;

		if ( element.name != def.element )
			return false;

		for ( attrName in defAttrs ) {
			if ( attrName == 'class' ) {
				classes = defAttrs[ attrName ].split( /\s+/ );
				classPattern = element.classes.join( '|' );
				while ( ( cl = classes.pop() ) ) {
					if ( classPattern.indexOf( cl ) == -1 )
						return false;
				}
			} else {
				if ( element.attributes[ attrName ] != defAttrs[ attrName ] )
					return false;
			}
		}

		for ( styleName in defStyles ) {
			if ( element.styles[ styleName ] != defStyles[ styleName ] )
				return false;
		}

		return true;
	}

	// Return transformation group for content form.
	// One content form makes one transformation rule in one group.
	function getContentFormTransformationGroup( form, preferredForm ) {
		var element, left;

		if ( typeof form == 'string' )
			element = form;
		else if ( form instanceof CKEDITOR.style )
			left = form;
		else {
			element = form[ 0 ];
			left = form[ 1 ];
		}

		return [ {
			element: element,
			left: left,
			right: function( el, tools ) {
				tools.transform( el, preferredForm );
			}
		} ];
	}

	// Obtain element's name from transformation rule.
	// It will be defined by #element, or #check or #left (styleDef.element).
	function getElementNameForTransformation( rule, check ) {
		if ( rule.element )
			return rule.element;
		if ( check )
			return check.match( /^([a-z0-9]+)/i )[ 0 ];
		return rule.left.getDefinition().element;
	}

	function getMatchStyleFn( style ) {
		return function( el ) {
			return elementMatchesStyle( el, style );
		};
	}

	function getTransformationFn( toolName ) {
		return function( el, tools ) {
			tools[ toolName ]( el );
		};
	}

	function optimizeTransformationsGroup( rules ) {
		var groupName, i, rule,
			check, left, right,
			optimizedRules = [];

		for ( i = 0; i < rules.length; ++i ) {
			rule = rules[ i ];

			if ( typeof rule == 'string' ) {
				rule = rule.split( /\s*:\s*/ );
				check = rule[ 0 ];
				left = null;
				right = rule[ 1 ];
			} else {
				check = rule.check;
				left = rule.left;
				right = rule.right;
			}

			// Extract element name.
			if ( !groupName )
				groupName = getElementNameForTransformation( rule, check );

			if ( left instanceof CKEDITOR.style )
				left = getMatchStyleFn( left );

			optimizedRules.push( {
				// It doesn't make sense to test against name rule (e.g. 'table'), so don't save it.
				check: check == groupName ? null : check,

				left: left,

				// Handle shorthand format. E.g.: 'table[width]:sizeToAttribute'.
				right: typeof right == 'string' ? getTransformationFn( right ) : right
			} );
		}

		return {
			name: groupName,
			rules: optimizedRules
		};
	}

	/**
	 * Singleton containing tools useful for transformation rules.
	 *
	 * @class CKEDITOR.filter.transformationsTools
	 * @singleton
	 */
	transformationsTools = CKEDITOR.filter.transformationsTools = {
		/**
		 * Converts `width` and `height` attributes to styles.
		 *
		 * @param {CKEDITOR.htmlParser.element} element
		 */
		sizeToStyle: function( element ) {
			this.lengthToStyle( element, 'width' );
			this.lengthToStyle( element, 'height' );
		},

		/**
		 * Converts `width` and `height` styles to attributes.
		 *
		 * @param {CKEDITOR.htmlParser.element} element
		 */
		sizeToAttribute: function( element ) {
			this.lengthToAttribute( element, 'width' );
			this.lengthToAttribute( element, 'height' );
		},

		/**
		 * Converts length in the `attrName` attribute to a valid CSS length (like `width` or `height`).
		 *
		 * @param {CKEDITOR.htmlParser.element} element
		 * @param {String} attrName Name of the attribute that will be converted.
		 * @param {String} [styleName=attrName] Name of the style into which the attribute will be converted.
		 */
		lengthToStyle: function( element, attrName, styleName ) {
			styleName = styleName || attrName;

			if ( !( styleName in element.styles ) ) {
				var value = element.attributes[ attrName ];

				if ( value ) {
					if ( ( /^\d+$/ ).test( value ) )
						value += 'px';

					element.styles[ styleName ] = value;
				}
			}

			delete element.attributes[ attrName ];
		},

		/**
		 * Converts length in the `styleName` style to a valid length attribute (like `width` or `height`).
		 *
		 * @param {CKEDITOR.htmlParser.element} element
		 * @param {String} styleName The name of the style that will be converted.
		 * @param {String} [attrName=styleName] The name of the attribute into which the style will be converted.
		 */
		lengthToAttribute: function( element, styleName, attrName ) {
			attrName = attrName || styleName;

			if ( !( attrName in element.attributes ) ) {
				var value = element.styles[ styleName ],
					match = value && value.match( /^(\d+)(?:\.\d*)?px$/ );

				if ( match )
					element.attributes[ attrName ] = match[ 1 ];
				// Pass the TEST_VALUE used by filter#check when mocking element.
				else if ( value == TEST_VALUE )
					element.attributes[ attrName ] = TEST_VALUE;
			}

			delete element.styles[ styleName ];
		},

		/**
		 * Converts the `align` attribute to the `float` style if not set. The attribute
		 * is always removed.
		 *
		 * @param {CKEDITOR.htmlParser.element} element
		 */
		alignmentToStyle: function( element ) {
			if ( !( 'float' in element.styles ) ) {
				var value = element.attributes.align;

				if ( value == 'left' || value == 'right' )
					element.styles[ 'float' ] = value; // Uh... GCC doesn't like the 'float' prop name.
			}

			delete element.attributes.align;
		},

		/**
		 * Converts the `float` style to the `align` attribute if not set.
		 * The style is always removed.
		 *
		 * @param {CKEDITOR.htmlParser.element} element
		 */
		alignmentToAttribute: function( element ) {
			if ( !( 'align' in element.attributes ) ) {
				var value = element.styles[ 'float' ];

				if ( value == 'left' || value == 'right' )
					element.attributes.align = value;
			}

			delete element.styles[ 'float' ]; // Uh... GCC doesn't like the 'float' prop name.
		},

		/**
		 * Converts the shorthand form of the `border` style to seperate styles.
		 *
		 * @param {CKEDITOR.htmlParser.element} element
		 */
		splitBorderShorthand: function( element ) {
			if ( !element.styles.border ) {
				return;
			}

			var borderSplittedStyles = CKEDITOR.tools.style.parse.border( element.styles.border );

			if ( borderSplittedStyles.color ) {
				element.styles[ 'border-color' ] = borderSplittedStyles.color;
			}
			if ( borderSplittedStyles.style ) {
				element.styles[ 'border-style' ] = borderSplittedStyles.style;
			}
			if ( borderSplittedStyles.width ) {
				element.styles[ 'border-width' ] = borderSplittedStyles.width;
			}

			delete element.styles.border;
		},

		listTypeToStyle: function( element ) {
			if ( element.attributes.type ) {
				switch ( element.attributes.type ) {
					case 'a':
						element.styles[ 'list-style-type' ] = 'lower-alpha';
						break;
					case 'A':
						element.styles[ 'list-style-type' ] = 'upper-alpha';
						break;
					case 'i':
						element.styles[ 'list-style-type' ] = 'lower-roman';
						break;
					case 'I':
						element.styles[ 'list-style-type' ] = 'upper-roman';
						break;
					case '1':
						element.styles[ 'list-style-type' ] = 'decimal';
						break;
					default:
						element.styles[ 'list-style-type' ] = element.attributes.type;
				}
			}
		},

		/**
		 * Converts the shorthand form of the `margin` style to seperate styles.
		 *
		 * @param {CKEDITOR.htmlParser.element} element
		 */
		splitMarginShorthand: function( element ) {
			if ( !element.styles.margin ) {
				return;
			}

			var widths = element.styles.margin.match( /(\-?[\.\d]+\w+)/g ) || [ '0px' ];
			switch ( widths.length ) {
				case 1:
					mapStyles( [ 0, 0, 0, 0 ] );
					break;
				case 2:
					mapStyles( [ 0, 1, 0, 1 ] );
					break;
				case 3:
					mapStyles( [ 0, 1, 2, 1 ] );
					break;
				case 4:
					mapStyles( [ 0, 1, 2, 3 ] );
					break;
			}

			delete element.styles.margin;

			function mapStyles( map ) {
				element.styles['margin-top'] = widths[ map[0] ];
				element.styles['margin-right'] = widths[ map[1] ];
				element.styles['margin-bottom'] = widths[ map[2] ];
				element.styles['margin-left'] = widths[ map[3] ];
			}
		},

		/**
		 * Checks whether an element matches a given {@link CKEDITOR.style}.
		 * The element can be a "superset" of a style, e.g. it may have
		 * more classes, but needs to have at least those defined in the style.
		 *
		 * @param {CKEDITOR.htmlParser.element} element
		 * @param {CKEDITOR.style} style
		 */
		matchesStyle: elementMatchesStyle,

		/**
		 * Transforms an element to a given form.
		 *
		 * Form may be a:
		 *
		 *	* {@link CKEDITOR.style},
		 *	* string &ndash; the new name of the element.
		 *
		 * @param {CKEDITOR.htmlParser.element} el
		 * @param {CKEDITOR.style/String} form
		 */
		transform: function( el, form ) {
			if ( typeof form == 'string' )
				el.name = form;
			// Form is an instance of CKEDITOR.style.
			else {
				var def = form.getDefinition(),
					defStyles = def.styles,
					defAttrs = def.attributes,
					attrName, styleName,
					existingClassesPattern, defClasses, cl;

				el.name = def.element;

				for ( attrName in defAttrs ) {
					if ( attrName == 'class' ) {
						existingClassesPattern = el.classes.join( '|' );
						defClasses = defAttrs[ attrName ].split( /\s+/ );

						while ( ( cl = defClasses.pop() ) ) {
							if ( existingClassesPattern.indexOf( cl ) == -1 )
								el.classes.push( cl );
						}
					} else {
						el.attributes[ attrName ] = defAttrs[ attrName ];
					}

				}

				for ( styleName in defStyles ) {
					el.styles[ styleName ] = defStyles[ styleName ];
				}
			}
		}
	};

} )();

/**
 * Allowed content rules. This setting is used when
 * instantiating {@link CKEDITOR.editor#filter}.
 *
 * The following values are accepted:
 *
 *	* {@link CKEDITOR.filter.allowedContentRules} &ndash; defined rules will be added
 *	to the {@link CKEDITOR.editor#filter}.
 *	* `true` &ndash; will disable the filter (data will not be filtered,
 *	all features will be activated). Reading {@glink guide/dev_best_practices security best practices} before setting `true` is recommended.
 *	* default &ndash; the filter will be configured by loaded features
 *	(toolbar items, commands, etc.).
 *
 * In all cases filter configuration may be extended by
 * {@link CKEDITOR.config#extraAllowedContent}. This option may be especially
 * useful when you want to use the default `allowedContent` value
 * along with some additional rules.
 *
 *		CKEDITOR.replace( 'textarea_id', {
 *			allowedContent: 'p b i; a[!href]',
 *			on: {
 *				instanceReady: function( evt ) {
 *					var editor = evt.editor;
 *
 *					editor.filter.check( 'h1' ); // -> false
 *					editor.setData( '<h1><i>Foo</i></h1><p class="left"><span>Bar</span> <a href="http://foo.bar">foo</a></p>' );
 *					// Editor contents will be:
 *					'<p><i>Foo</i></p><p>Bar <a href="http://foo.bar">foo</a></p>'
 *				}
 *			}
 *		} );
 *
 * It is also possible to disallow some already allowed content. It is especially
 * useful when you want to "trim down" the content allowed by default by
 * editor features. To do that, use the {@link #disallowedContent} option.
 *
 * Read more in the {@glink guide/dev_acf documentation}
 * and see the {@glink examples/acf example}.
 *
 * @since 4.1.0
 * @cfg {CKEDITOR.filter.allowedContentRules/Boolean} [allowedContent=null]
 * @member CKEDITOR.config
 */

/**
 * This option makes it possible to set additional allowed
 * content rules for {@link CKEDITOR.editor#filter}.
 *
 * It is especially useful in combination with the default
 * {@link CKEDITOR.config#allowedContent} value:
 *
 *		CKEDITOR.replace( 'textarea_id', {
 *			plugins: 'wysiwygarea,toolbar,format',
 *			extraAllowedContent: 'b i',
 *			on: {
 *				instanceReady: function( evt ) {
 *					var editor = evt.editor;
 *
 *					editor.filter.check( 'h1' ); // -> true (thanks to Format combo)
 *					editor.filter.check( 'b' ); // -> true (thanks to extraAllowedContent)
 *					editor.setData( '<h1><i>Foo</i></h1><p class="left"><b>Bar</b> <a href="http://foo.bar">foo</a></p>' );
 *					// Editor contents will be:
 *					'<h1><i>Foo</i></h1><p><b>Bar</b> foo</p>'
 *				}
 *			}
 *		} );
 *
 * Read more in the [documentation](#!/guide/dev_acf-section-automatic-mode-and-allow-additional-tagsproperties)
 * and see the {@glink examples/acf example}.
 * See also {@link CKEDITOR.config#allowedContent} for more details.
 *
 * @since 4.1.0
 * @cfg {Object/String} extraAllowedContent
 * @member CKEDITOR.config
 */

/**
 * Disallowed content rules. They have precedence over {@link #allowedContent allowed content rules}.
 * Read more in the {@glink guide/dev_disallowed_content Disallowed Content guide}.
 *
 * Read more in the [documentation](#!/guide/dev_acf-section-automatic-mode-but-disallow-certain-tagsproperties)
 * and see the {@glink examples/acf example}.
 * See also {@link CKEDITOR.config#allowedContent} and {@link CKEDITOR.config#extraAllowedContent}.
 *
 * @since 4.4.0
 * @cfg {CKEDITOR.filter.disallowedContentRules} disallowedContent
 * @member CKEDITOR.config
 */

/**
 * This event is fired when {@link CKEDITOR.filter} has stripped some
 * content from the data that was loaded (e.g. by {@link CKEDITOR.editor#method-setData}
 * method or in the source mode) or inserted (e.g. when pasting or using the
 * {@link CKEDITOR.editor#method-insertHtml} method).
 *
 * This event is useful when testing whether the {@link CKEDITOR.config#allowedContent}
 * setting is sufficient and correct for a system that is migrating to CKEditor 4.1.0
 * (where the {@glink guide/dev_advanced_content_filter Advanced Content Filter} was introduced).
 *
 * @since 4.1.0
 * @event dataFiltered
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor This editor instance.
 */

/**
 * Virtual class which is the {@glink guide/dev_allowed_content_rules Allowed Content Rules} formats type.
 *
 * Possible formats are:
 *
 *	* the [string format](#!/guide/dev_allowed_content_rules-section-string-format),
 *	* the [object format](#!/guide/dev_allowed_content_rules-section-object-format),
 *	* a {@link CKEDITOR.style} instance &ndash; used mainly for integrating plugins with Advanced Content Filter,
 *	* an array of the above formats.
 *
 * @since 4.1.0
 * @class CKEDITOR.filter.allowedContentRules
 * @abstract
 */

/**
 * Virtual class representing the {@link CKEDITOR.filter#disallow} argument and a type of
 * the {@link CKEDITOR.config#disallowedContent} option.
 *
 * This is a simplified version of the {@link CKEDITOR.filter.allowedContentRules} type.
 * Only the string format and object format are accepted. Required properties
 * are not allowed in this format.
 *
 * Read more in the {@glink guide/dev_disallowed_content Disallowed Content guide}.
 *
 * @since 4.4.0
 * @class CKEDITOR.filter.disallowedContentRules
 * @abstract
 */

/**
 * Virtual class representing {@link CKEDITOR.filter#check} argument.
 *
 * This is a simplified version of the {@link CKEDITOR.filter.allowedContentRules} type.
 * It may contain only one element and its styles, classes, and attributes. Only the
 * string format and a {@link CKEDITOR.style} instances are accepted. Required properties
 * are not allowed in this format.
 *
 * Example:
 *
 *		'img[src,alt](foo)'	// Correct rule.
 *		'ol, ul(!foo)'		// Incorrect rule. Multiple elements and required
 *							// properties are not supported.
 *
 * @since 4.1.0
 * @class CKEDITOR.filter.contentRule
 * @abstract
 */

/**
 * Interface that may be automatically implemented by any
 * instance of any class which has at least the `name` property and
 * can be meant as an editor feature.
 *
 * For example:
 *
 *	* "Bold" command, button, and keystroke &ndash; it does not mean exactly
 * `<strong>` or `<b>` but just the ability to create bold text.
 *	* "Format" drop-down list &ndash; it also does not imply any HTML tag.
 *	* "Link" command, button, and keystroke.
 *	* "Image" command, button, and dialog window.
 *
 * Thus most often a feature is an instance of one of the following classes:
 *
 *	* {@link CKEDITOR.command}
 *	* {@link CKEDITOR.ui.button}
 *	* {@link CKEDITOR.ui.richCombo}
 *
 * None of them have a `name` property explicitly defined, but
 * it is set by {@link CKEDITOR.editor#addCommand} and {@link CKEDITOR.ui#add}.
 *
 * During editor initialization all features that the editor should activate
 * should be passed to {@link CKEDITOR.editor#addFeature} (shorthand for {@link CKEDITOR.filter#addFeature}).
 *
 * This method checks if a feature can be activated (see {@link #requiredContent}) and if yes,
 * then it registers allowed content rules required by this feature (see {@link #allowedContent}) along
 * with two kinds of transformations: {@link #contentForms} and {@link #contentTransformations}.
 *
 * By default all buttons that are included in {@glink features/toolbar toolbar layout configuration}
 * are checked and registered with {@link CKEDITOR.editor#addFeature}, all styles available in the
 * 'Format' and 'Styles' drop-down lists are checked and registered too and so on.
 *
 * @since 4.1.0
 * @class CKEDITOR.feature
 * @abstract
 */

/**
 * HTML code that can be generated by this feature.
 *
 * For example a basic image feature (image button displaying the image dialog window)
 * may allow `'img[!src,alt,width,height]'`.
 *
 * During the feature activation this value is passed to {@link CKEDITOR.filter#allow}.
 *
 * @property {CKEDITOR.filter.allowedContentRules} [allowedContent=null]
 */

/**
 * Minimal HTML code that this feature must be allowed to
 * generate in order to work.
 *
 * For example a basic image feature (image button displaying the image dialog window)
 * needs `'img[src,alt]'` in order to be activated.
 *
 * During the feature validation this value is passed to {@link CKEDITOR.filter#check}.
 *
 * If this value is not provided, a feature will be always activated.
 *
 * @property {CKEDITOR.filter.contentRule} [requiredContent=null]
 */

/**
 * The name of the feature.
 *
 * It is used for example to identify which {@link CKEDITOR.filter#allowedContent}
 * rule was added for which feature.
 *
 * @property {String} name
 */

/**
 * Feature content forms to be registered in the {@link CKEDITOR.editor#filter}
 * during the feature activation.
 *
 * See {@link CKEDITOR.filter#addContentForms} for more details.
 *
 * @property [contentForms=null]
 */

/**
 * Transformations (usually for content generated by this feature, but not necessarily)
 * that will be registered in the {@link CKEDITOR.editor#filter} during the feature activation.
 *
 * See {@link CKEDITOR.filter#addTransformations} for more details.
 *
 * @property [contentTransformations=null]
 */

/**
 * Returns a feature that this feature needs to register.
 *
 * In some cases, during activation, one feature may need to register
 * another feature. For example a {@link CKEDITOR.ui.button} often registers
 * a related command. See {@link CKEDITOR.ui.button#toFeature}.
 *
 * This method is executed when a feature is passed to the {@link CKEDITOR.editor#addFeature}.
 *
 * @method toFeature
 * @returns {CKEDITOR.feature}
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Defines the {@link CKEDITOR.focusManager} class, which is used
 *		to handle the focus in editor instances.
 */

( function() {
	/**
	 * Manages the focus activity in an editor instance. This class is to be
	 * used mainly by UI element coders when adding interface elements that need
	 * to set the focus state of the editor.
	 *
	 *		var focusManager = new CKEDITOR.focusManager( editor );
	 *		focusManager.focus();
	 *
	 * @class
	 * @constructor Creates a focusManager class instance.
	 * @param {CKEDITOR.editor} editor The editor instance.
	 */
	CKEDITOR.focusManager = function( editor ) {
		if ( editor.focusManager )
			return editor.focusManager;

		/**
		 * Indicates that the editor instance has focus.
		 *
		 *		alert( CKEDITOR.instances.editor1.focusManager.hasFocus ); // e.g. true
		 */
		this.hasFocus = false;

		/**
		 * Indicates the currently focused DOM element that makes the editor activated.
		 *
		 * @property {CKEDITOR.dom.domObject}
		 */
		this.currentActive = null;

		/**
		 * Object used to store private stuff.
		 *
		 * @private
		 */
		this._ = {
			editor: editor
		};

		return this;
	};

	var SLOT_NAME = 'focusmanager',
		SLOT_NAME_LISTENERS = 'focusmanager_handlers';

	/**
	 * Object used to store private stuff.
	 *
	 * @private
	 * @class
	 * @singleton
	 */
	CKEDITOR.focusManager._ = {
		/**
		 * The delay (in milliseconds) to deactivate the editor when a UI DOM element has lost focus.
		 *
		 * @private
		 * @property {Number} [blurDelay=200]
		 * @member CKEDITOR.focusManager._
		 */
		blurDelay: 200
	};

	CKEDITOR.focusManager.prototype = {

		/**
		 * Indicates that this editor instance is activated (due to a DOM focus change).
		 * The `activated` state is a symbolic indicator of an active user
		 * interaction session.
		 *
		 * **Note:** This method will not introduce UI focus
		 * impact on DOM, it is here to record the editor UI focus state internally.
		 * If you want to make the cursor blink inside the editable, use
		 * {@link CKEDITOR.editor#method-focus} instead.
		 *
		 *		var editor = CKEDITOR.instances.editor1;
		 *		editor.focusManager.focus( editor.editable() );
		 *
		 * @param {CKEDITOR.dom.element} [currentActive] The new value of the {@link #currentActive} property.
		 * @member CKEDITOR.focusManager
		 */
		focus: function( currentActive ) {
			if ( this._.timer )
				clearTimeout( this._.timer );

			if ( currentActive )
				this.currentActive = currentActive;

			if ( !( this.hasFocus || this._.locked ) ) {
				// If another editor has the current focus, we first "blur" it. In
				// this way the events happen in a more logical sequence, like:
				//		"focus 1" > "blur 1" > "focus 2"
				// ... instead of:
				//		"focus 1" > "focus 2" > "blur 1"
				var current = CKEDITOR.currentInstance;
				current && current.focusManager.blur( 1 );

				this.hasFocus = true;

				var ct = this._.editor.container;
				ct && ct.addClass( 'cke_focus' );
				this._.editor.fire( 'focus' );
			}
		},

		/**
		 * Prevents from changing the focus manager state until the next {@link #unlock} is called.
		 *
		 * @member CKEDITOR.focusManager
		 */
		lock: function() {
			this._.locked = 1;
		},

		/**
		 * Restores the automatic focus management if {@link #lock} is called.
		 *
		 * @member CKEDITOR.focusManager
		 */
		unlock: function() {
			delete this._.locked;
		},

		/**
		 * Used to indicate that the editor instance has been deactivated by the specified
		 * element which has just lost focus.
		 *
		 * **Note:** This function acts asynchronously with a delay of 100ms to
		 * avoid temporary deactivation. Use the `noDelay` parameter instead
		 * to deactivate immediately.
		 *
		 *		var editor = CKEDITOR.instances.editor1;
		 *		editor.focusManager.blur();
		 *
		 * @param {Boolean} [noDelay=false] Immediately deactivate the editor instance synchronously.
		 * @member CKEDITOR.focusManager
		 */
		blur: function( noDelay ) {
			if ( this._.locked ) {
				return;
			}

			function doBlur() {
				if ( this.hasFocus ) {
					this.hasFocus = false;

					var ct = this._.editor.container;
					ct && ct.removeClass( 'cke_focus' );
					this._.editor.fire( 'blur' );
				}
			}

			if ( this._.timer ) {
				clearTimeout( this._.timer );
			}

			var delay = CKEDITOR.focusManager._.blurDelay;
			if ( noDelay || !delay ) {
				doBlur.call( this );
			} else {
				this._.timer = CKEDITOR.tools.setTimeout( function() {
					delete this._.timer;
					doBlur.call( this );
				}, delay, this );
			}
		},

		/**
		 * Registers a UI DOM element to the focus manager, which will make the focus manager "hasFocus"
		 * once the input focus is relieved on the element.
		 * This method is designed to be used by plugins to expand the jurisdiction of the editor focus.
		 *
		 * @param {CKEDITOR.dom.element} element The container (topmost) element of one UI part.
		 * @param {Boolean} isCapture If specified, {@link CKEDITOR.event#useCapture} will be used when listening to the focus event.
		 * @member CKEDITOR.focusManager
		 */
		add: function( element, isCapture ) {
			var fm = element.getCustomData( SLOT_NAME );
			if ( !fm || fm != this ) {
				// If this element is already taken by another instance, dismiss it first.
				fm && fm.remove( element );

				var focusEvent = 'focus',
					blurEvent = 'blur';

				// Bypass the element's internal DOM focus change.
				if ( isCapture ) {

					// Use "focusin/focusout" events instead of capture phase in IEs,
					// which fires synchronously.
					if ( CKEDITOR.env.ie ) {
						focusEvent = 'focusin';
						blurEvent = 'focusout';
					} else {
						CKEDITOR.event.useCapture = 1;
					}
				}

				var listeners = {
					blur: function() {
						if ( element.equals( this.currentActive ) )
							this.blur();
					},
					focus: function() {
						this.focus( element );
					}
				};

				element.on( focusEvent, listeners.focus, this );
				element.on( blurEvent, listeners.blur, this );

				if ( isCapture )
					CKEDITOR.event.useCapture = 0;

				element.setCustomData( SLOT_NAME, this );
				element.setCustomData( SLOT_NAME_LISTENERS, listeners );
			}
		},

		/**
		 * Dismisses an element from the focus manager delegations added by {@link #add}.
		 *
		 * @param {CKEDITOR.dom.element} element The element to be removed from the focus manager.
		 * @member CKEDITOR.focusManager
		 */
		remove: function( element ) {
			element.removeCustomData( SLOT_NAME );
			var listeners = element.removeCustomData( SLOT_NAME_LISTENERS );
			element.removeListener( 'blur', listeners.blur );
			element.removeListener( 'focus', listeners.focus );
		}

	};

} )();

/**
 * Fired when the editor instance receives the input focus.
 *
 *		editor.on( 'focus', function( e ) {
 *			alert( 'The editor named ' + e.editor.name + ' is now focused' );
 *		} );
 *
 * @event focus
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor The editor instance.
 */

/**
 * Fired when the editor instance loses the input focus.
 *
 * **Note:** This event will **NOT** be triggered when focus is moved internally, e.g. from
 * an editable to another part of the editor UI like a dialog window.
 * If you are interested only in the focus state of the editable, listen to the `focus`
 * and `blur` events of the {@link CKEDITOR.editable} instead.
 *
 *		editor.on( 'blur', function( e ) {
 *			alert( 'The editor named ' + e.editor.name + ' lost the focus' );
 *		} );
 *
 * @event blur
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor The editor instance.
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * Controls keystrokes typing in an editor instance.
 *
 * @class
 * @constructor Creates a keystrokeHandler class instance.
 * @param {CKEDITOR.editor} editor The editor instance.
 */
CKEDITOR.keystrokeHandler = function( editor ) {
	if ( editor.keystrokeHandler )
		return editor.keystrokeHandler;

	/**
	 * A list of keystrokes associated with commands. Each entry points to the
	 * command to be executed.
	 *
	 * Since CKEditor 4 there is no need to modify this property directly during the runtime.
	 * Use {@link CKEDITOR.editor#setKeystroke} instead.
	 */
	this.keystrokes = {};

	/**
	 * A list of keystrokes that should be blocked if not defined in
	 * {@link #keystrokes}. In this way it is possible to block the default
	 * browser behavior for those keystrokes.
	 */
	this.blockedKeystrokes = {};

	this._ = {
		editor: editor
	};

	return this;
};

( function() {
	var cancel;

	var onKeyDown = function( event ) {
			// The DOM event object is passed by the "data" property.
			event = event.data;

			var keyCombination = event.getKeystroke();
			var command = this.keystrokes[ keyCombination ];
			var editor = this._.editor;

			cancel = ( editor.fire( 'key', { keyCode: keyCombination, domEvent: event } ) === false );

			if ( !cancel ) {
				if ( command ) {
					var data = { from: 'keystrokeHandler' };
					cancel = ( editor.execCommand( command, data ) !== false );
				}

				if ( !cancel )
					cancel = !!this.blockedKeystrokes[ keyCombination ];
			}

			if ( cancel )
				event.preventDefault( true );

			return !cancel;
		};

	var onKeyPress = function( event ) {
			if ( cancel ) {
				cancel = false;
				event.data.preventDefault( true );
			}
		};

	CKEDITOR.keystrokeHandler.prototype = {
		/**
		 * Attaches this keystroke handle to a DOM object. Keystrokes typed
		 * over this object will be handled by this keystrokeHandler.
		 *
		 * @param {CKEDITOR.dom.domObject} domObject The DOM object to attach to.
		 */
		attach: function( domObject ) {
			// For most browsers, it is enough to listen to the keydown event
			// only.
			domObject.on( 'keydown', onKeyDown, this );

			// Some browsers instead, don't cancel key events in the keydown, but in the
			// keypress. So we must do a longer trip in those cases.
			if ( CKEDITOR.env.gecko && CKEDITOR.env.mac )
				domObject.on( 'keypress', onKeyPress, this );
		}
	};
} )();

/**
 * A list associating keystrokes with editor commands. Each element in the list
 * is an array where the first item is the keystroke, and the second is the
 * name of the command to be executed.
 *
 * This setting should be used to define (as well as to overwrite or remove) keystrokes
 * set by plugins (like `link` and `basicstyles`). If you want to set a keystroke
 * for your plugin or during the runtime, use {@link CKEDITOR.editor#setKeystroke} instead.
 *
 * Since default keystrokes are set by the {@link CKEDITOR.editor#setKeystroke}
 * method, by default `config.keystrokes` is an empty array.
 *
 * See {@link CKEDITOR.editor#setKeystroke} documentation for more details
 * regarding the start up order.
 *
 *		// Change default Ctrl+L keystroke for 'link' command to Ctrl+Shift+L.
 *		config.keystrokes = [
 *			...
 *			[ CKEDITOR.CTRL + CKEDITOR.SHIFT + 76, 'link' ],	// Ctrl+Shift+L
 *			...
 *		];
 *
 * To reset a particular keystroke, the following approach can be used:
 *
 *		// Disable default Ctrl+L keystroke which executes the 'link' command by default.
 *		config.keystrokes = [
 *			...
 *			[ CKEDITOR.CTRL + 76, null ],						// Ctrl+L
 *			...
 *		];
 *
 * In order to reset all default keystrokes, a {@link CKEDITOR#instanceReady} callback should be
 * used. This is since editor defaults are merged rather than overwritten by
 * user keystrokes.
 *
 * **Note**: This can be potentially harmful for the editor. Avoid this unless you are
 * aware of the consequences.
 *
 *		// Reset all default keystrokes.
 *		config.on.instanceReady = function() {
 *			this.keystrokeHandler.keystrokes = [];
 *		};
 *
 * @cfg {Array} [keystrokes=[]]
 * @member CKEDITOR.config
 */

/**
 * Fired when any keyboard key (or a combination thereof) is pressed in the editing area.
 *
 *		editor.on( 'key', function( evt ) {
 *			if ( evt.data.keyCode == CKEDITOR.CTRL + 90 ) {
 *				// Do something...
 *
 *				// Cancel the event, so other listeners will not be executed and
 *				// the keydown's default behavior will be prevented.
 *				evt.cancel();
 *			}
 *		} );
 *
 * Usually you will want to use the {@link CKEDITOR.editor#setKeystroke} method or
 * the {@link CKEDITOR.config#keystrokes} option to attach a keystroke to some {@link CKEDITOR.command command}.
 * Key event listeners are usuful when some action should be executed conditionally, based
 * for example on precise selection location.
 *
 * @event key
 * @member CKEDITOR.editor
 * @param data
 * @param {Number} data.keyCode A number representing the key code (or a combination thereof).
 * It is the sum of the current key code and the {@link CKEDITOR#CTRL}, {@link CKEDITOR#SHIFT}
 * and {@link CKEDITOR#ALT} constants, if those are pressed.
 * @param {CKEDITOR.dom.event} data.domEvent A `keydown` DOM event instance. Available since CKEditor 4.4.1.
 * @param {CKEDITOR.editor} editor This editor instance.
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

( function() {
	/**
	 * Stores language-related functions.
	 *
	 * @class
	 * @singleton
	 */
	CKEDITOR.lang = {
		/**
		 * The list of languages available in the editor core.
		 *
		 *		alert( CKEDITOR.lang.languages.en ); // 1
		 */
		languages: {
			af: 1, ar: 1, az: 1, bg: 1, bn: 1, bs: 1, ca: 1, cs: 1, cy: 1, da: 1, de: 1, 'de-ch': 1, el: 1,
			'en-au': 1, 'en-ca': 1, 'en-gb': 1, en: 1, eo: 1, es: 1, 'es-mx':1, et: 1, eu: 1, fa: 1, fi: 1, fo: 1,
			'fr-ca': 1, fr: 1, gl: 1, gu: 1, he: 1, hi: 1, hr: 1, hu: 1, id: 1, is: 1, it: 1, ja: 1, ka: 1,
			km: 1, ko: 1, ku: 1, lt: 1, lv: 1, mk: 1, mn: 1, ms: 1, nb: 1, nl: 1, no: 1, oc: 1, pl: 1, 'pt-br': 1,
			pt: 1, ro: 1, ru: 1, si: 1, sk: 1, sl: 1, sq: 1, 'sr-latn': 1, sr: 1, sv: 1, th: 1, tr: 1, tt: 1, ug: 1,
			uk: 1, vi: 1, 'zh-cn': 1, zh: 1
		},

		/**
		 * The list of languages that are written Right-To-Left (RTL) and are supported by the editor.
		 */
		rtl: { ar: 1, fa: 1, he: 1, ku: 1, ug: 1 },

		/**
		 * Loads a specific language file, or auto detects it. A callback is
		 * then called when the file gets loaded.
		 *
		 * @param {String} languageCode The code of the language file to be
		 * loaded. If null or empty, autodetection will be performed. The
		 * same happens if the language is not supported.
		 * @param {String} defaultLanguage The language to be used if
		 * `languageCode` is not supported or if the autodetection fails.
		 * @param {Function} callback A function to be called once the
		 * language file is loaded. Two parameters are passed to this
		 * function: the language code and the loaded language entries.
		 */
		load: function( languageCode, defaultLanguage, callback ) {
			// If no languageCode - fallback to browser or default.
			// If languageCode - fallback to no-localized version or default.
			if ( !languageCode || !CKEDITOR.lang.languages[ languageCode ] )
				languageCode = this.detect( defaultLanguage, languageCode );

			var that = this,
				loadedCallback = function() {
					that[ languageCode ].dir = that.rtl[ languageCode ] ? 'rtl' : 'ltr';
					callback( languageCode, that[ languageCode ] );
				};

			if ( !this[ languageCode ] )
				CKEDITOR.scriptLoader.load( CKEDITOR.getUrl( 'lang/' + languageCode + '.js' ), loadedCallback, this );
			else
				loadedCallback();
		},

		/**
		 * Returns the language that best fits the user language. For example,
		 * suppose that the user language is "pt-br". If this language is
		 * supported by the editor, it is returned. Otherwise, if only "pt" is
		 * supported, it is returned instead. If none of the previous are
		 * supported, a default language is then returned.
		 *
		 *		alert( CKEDITOR.lang.detect( 'en' ) ); // e.g., in a German browser: 'de'
		 *
		 * @param {String} defaultLanguage The default language to be returned
		 * if the user language is not supported.
		 * @param {String} [probeLanguage] A language code to try to use,
		 * instead of the browser-based autodetection.
		 * @returns {String} The detected language code.
		 */
		detect: function( defaultLanguage, probeLanguage ) {
			var languages = this.languages;
			probeLanguage = probeLanguage || navigator.userLanguage || navigator.language || defaultLanguage;

			var parts = probeLanguage.toLowerCase().match( /([a-z]+)(?:-([a-z]+))?/ ),
				lang = parts[ 1 ],
				locale = parts[ 2 ];

			if ( languages[ lang + '-' + locale ] )
				lang = lang + '-' + locale;
			else if ( !languages[ lang ] )
				lang = null;

			CKEDITOR.lang.detect = lang ?
			function() {
				return lang;
			} : function( defaultLanguage ) {
				return defaultLanguage;
			};

			return lang || defaultLanguage;
		}
	};

} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Defines the {@link CKEDITOR.scriptLoader} object, used to load scripts
 *		asynchronously.
 */

/**
 * Load scripts asynchronously.
 *
 * @class
 * @singleton
 */
CKEDITOR.scriptLoader = ( function() {
	var uniqueScripts = {},
		waitingList = {};

	return {
		/**
		 * Loads one or more external scripts checking if it has not been loaded
		 * previously by this function.
		 *
		 *		CKEDITOR.scriptLoader.load( '/myscript.js' );
		 *
		 *		CKEDITOR.scriptLoader.load( '/myscript.js', function( success ) {
		 *			// Alerts true if the script has been properly loaded.
		 *			// HTTP error 404 should return false.
		 *			alert( success );
		 *		} );
		 *
		 *		CKEDITOR.scriptLoader.load( [ '/myscript1.js', '/myscript2.js' ], function( completed, failed ) {
		 *			alert( 'Number of scripts loaded: ' + completed.length );
		 *			alert( 'Number of failures: ' + failed.length );
		 *		} );
		 *
		 * @param {String/Array} scriptUrl One or more URLs pointing to the
		 * scripts to be loaded.
		 * @param {Function} [callback] A function to be called when the script
		 * is loaded and executed. If a string is passed to `scriptUrl`, a
		 * Boolean parameter is passed to the callback, indicating the
		 * success of the load. If an array is passed instead, two array
		 * parameters are passed to the callback: the first contains the
		 * URLs that have been properly loaded and the second the failed ones.
		 * @param {Object} [scope] The scope (`this` reference) to be used for
		 * the callback call. Defaults to {@link CKEDITOR}.
		 * @param {Boolean} [showBusy] Changes the cursor of the document while
		 * the script is loaded.
		 */
		load: function( scriptUrl, callback, scope, showBusy ) {
			var isString = ( typeof scriptUrl == 'string' );

			if ( isString )
				scriptUrl = [ scriptUrl ];

			if ( !scope )
				scope = CKEDITOR;

			var scriptCount = scriptUrl.length,
				completed = [],
				failed = [];

			var doCallback = function( success ) {
					if ( callback ) {
						if ( isString )
							callback.call( scope, success );
						else
							callback.call( scope, completed, failed );
					}
				};

			if ( scriptCount === 0 ) {
				doCallback( true );
				return;
			}

			var checkLoaded = function( url, success ) {
					( success ? completed : failed ).push( url );

					if ( --scriptCount <= 0 ) {
						showBusy && CKEDITOR.document.getDocumentElement().removeStyle( 'cursor' );
						doCallback( success );
					}
				};

			var onLoad = function( url, success ) {
					// Mark this script as loaded.
					uniqueScripts[ url ] = 1;

					// Get the list of callback checks waiting for this file.
					var waitingInfo = waitingList[ url ];
					delete waitingList[ url ];

					// Check all callbacks waiting for this file.
					for ( var i = 0; i < waitingInfo.length; i++ )
						waitingInfo[ i ]( url, success );
				};

			var loadScript = function( url ) {
					if ( uniqueScripts[ url ] ) {
						checkLoaded( url, true );
						return;
					}

					var waitingInfo = waitingList[ url ] || ( waitingList[ url ] = [] );
					waitingInfo.push( checkLoaded );

					// Load it only for the first request.
					if ( waitingInfo.length > 1 )
						return;

					// Create the <script> element.
					var script = new CKEDITOR.dom.element( 'script' );
					script.setAttributes( {
						type: 'text/javascript',
						src: url
					} );

					if ( callback ) {
						// The onload or onerror event does not fire in IE8 and IE9 Quirks Mode (https://dev.ckeditor.com/ticket/14849).
						if ( CKEDITOR.env.ie && ( CKEDITOR.env.version <= 8 || CKEDITOR.env.ie9Compat ) ) {
							script.$.onreadystatechange = function() {
								if ( script.$.readyState == 'loaded' || script.$.readyState == 'complete' ) {
									script.$.onreadystatechange = null;
									onLoad( url, true );
								}
							};
						} else {
							script.$.onload = function() {
								// Some browsers, such as Safari, may call the onLoad function
								// immediately. This will break the loading sequence. (https://dev.ckeditor.com/ticket/3661)
								setTimeout( function() {
									removeListeners( script );
									onLoad( url, true );
								}, 0 );
							};

							script.$.onerror = function() {
								removeListeners( script );
								onLoad( url, false );
							};
						}
					}

					// Append it to <head>.
					script.appendTo( CKEDITOR.document.getHead() );


				};

			showBusy && CKEDITOR.document.getDocumentElement().setStyle( 'cursor', 'wait' );
			for ( var i = 0; i < scriptCount; i++ ) {
				loadScript( scriptUrl[ i ] );
			}

			function removeListeners( script ) {
				// Once the script loaded or failed to load, remove listeners as this might lead to memory leaks (#589).
				script.$.onload = null;
				script.$.onerror = null;
			}
		},

		/**
		 * Loads a script in a queue, so only one is loaded at the same time.
		 *
		 * @since 4.1.2
		 * @param {String} scriptUrl The URL pointing to the script to be loaded.
		 * @param {Function} [callback] A function to be called when the script
		 * is loaded and executed. A Boolean parameter is passed to the callback,
		 * indicating the success of the load.
		 *
		 * @see CKEDITOR.scriptLoader#load
		 */
		queue: ( function() {
			var pending = [];

			// Loads the very first script from queue and removes it.
			function loadNext() {
				var script;

				if ( ( script = pending[ 0 ] ) )
					this.load( script.scriptUrl, script.callback, CKEDITOR, 0 );
			}

			return function( scriptUrl, callback ) {
				var that = this;

				// This callback calls the standard callback for the script
				// and loads the very next script from pending list.
				function callbackWrapper() {
					callback && callback.apply( this, arguments );

					// Removed the just loaded script from the queue.
					pending.shift();

					loadNext.call( that );
				}

				// Let's add this script to the queue
				pending.push( { scriptUrl: scriptUrl, callback: callbackWrapper } );

				// If the queue was empty, then start loading.
				if ( pending.length == 1 )
					loadNext.call( this );
			};
		} )()
	};
} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Defines the {@link CKEDITOR.resourceManager} class, which is
 *		the base for resource managers, like plugins.
 */

/**
 * Base class for resource managers, like plugins. This class is not
 * intended to be used out of the CKEditor core code.
 *
 * @class
 * @constructor Creates a resourceManager class instance.
 * @param {String} basePath The path for the resources folder.
 * @param {String} fileName The name used for resource files.
 */
CKEDITOR.resourceManager = function( basePath, fileName ) {
	/**
	 * The base directory containing all resources.
	 *
	 * @property {String}
	 */
	this.basePath = basePath;

	/**
	 * The name used for resource files.
	 *
	 * @property {String}
	 */
	this.fileName = fileName;

	/**
	 * Contains references to all resources that have already been registered
	 * with {@link #add}.
	 */
	this.registered = {};

	/**
	 * Contains references to all resources that have already been loaded
	 * with {@link #load}.
	 */
	this.loaded = {};

	/**
	 * Contains references to all resources that have already been registered
	 * with {@link #addExternal}.
	 */
	this.externals = {};

	/**
	 * @private
	 */
	this._ = {
		// List of callbacks waiting for plugins to be loaded.
		waitingList: {}
	};
};

CKEDITOR.resourceManager.prototype = {
	/**
	 * Registers a resource.
	 *
	 *		CKEDITOR.plugins.add( 'sample', { ... plugin definition ... } );
	 *
	 * @param {String} name The resource name.
	 * @param {Object} [definition] The resource definition.
	 * @see CKEDITOR.pluginDefinition
	 */
	add: function( name, definition ) {
		if ( this.registered[ name ] )
			throw new Error( '[CKEDITOR.resourceManager.add] The resource name "' + name + '" is already registered.' );

		var resource = this.registered[ name ] = definition || {};
		resource.name = name;
		resource.path = this.getPath( name );

		CKEDITOR.fire( name + CKEDITOR.tools.capitalize( this.fileName ) + 'Ready', resource );

		return this.get( name );
	},

	/**
	 * Gets the definition of a specific resource.
	 *
	 *		var definition = CKEDITOR.plugins.get( 'sample' );
	 *
	 * @param {String} name The resource name.
	 * @returns {Object} The registered object.
	 */
	get: function( name ) {
		return this.registered[ name ] || null;
	},

	/**
	 * Get the folder path for a specific loaded resource.
	 *
	 *		alert( CKEDITOR.plugins.getPath( 'sample' ) ); // '<editor path>/plugins/sample/'
	 *
	 * @param {String} name The resource name.
	 * @returns {String}
	 */
	getPath: function( name ) {
		var external = this.externals[ name ];
		return CKEDITOR.getUrl( ( external && external.dir ) || this.basePath + name + '/' );
	},

	/**
	 * Get the file path for a specific loaded resource.
	 *
	 *		alert( CKEDITOR.plugins.getFilePath( 'sample' ) ); // '<editor path>/plugins/sample/plugin.js'
	 *
	 * @param {String} name The resource name.
	 * @returns {String}
	 */
	getFilePath: function( name ) {
		var external = this.externals[ name ];
		return CKEDITOR.getUrl( this.getPath( name ) + ( external ? external.file : this.fileName + '.js' ) );
	},

	/**
	 * Registers one or more resources to be loaded from an external path
	 * instead of the core base path.
	 *
	 *		// Loads a plugin from '/myplugins/sample/plugin.js'.
	 *		CKEDITOR.plugins.addExternal( 'sample', '/myplugins/sample/' );
	 *
	 *		// Loads a plugin from '/myplugins/sample/my_plugin.js'.
	 *		CKEDITOR.plugins.addExternal( 'sample', '/myplugins/sample/', 'my_plugin.js' );
	 *
	 *		// Loads a plugin from '/myplugins/sample/my_plugin.js'.
	 *		CKEDITOR.plugins.addExternal( 'sample', '/myplugins/sample/my_plugin.js', '' );
	 *
	 * @param {String} names The resource names, separated by commas.
	 * @param {String} path The path of the folder containing the resource.
	 * @param {String} [fileName] The resource file name. If not provided, the
	 * default name is used. If provided with a empty string, will implicitly indicates that `path` argument
	 * is already the full path.
	 */
	addExternal: function( names, path, fileName ) {
		names = names.split( ',' );
		for ( var i = 0; i < names.length; i++ ) {
			var name = names[ i ];

			// If "fileName" is not provided, we assume that it may be available
			// in "path". Try to extract it in this case.
			if ( !fileName ) {
				path = path.replace( /[^\/]+$/, function( match ) {
					fileName = match;
					return '';
				} );
			}

			this.externals[ name ] = {
				dir: path,

				// Use the default file name if there is no "fileName" and it
				// was not found in "path".
				file: fileName || ( this.fileName + '.js' )
			};
		}
	},

	/**
	 * Loads one or more resources.
	 *
	 *		CKEDITOR.plugins.load( 'myplugin', function( plugins ) {
	 *			alert( plugins[ 'myplugin' ] ); // object
	 *		} );
	 *
	 * @param {String/Array} name The name of the resource to load. It may be a
	 * string with a single resource name, or an array with several names.
	 * @param {Function} callback A function to be called when all resources
	 * are loaded. The callback will receive an array containing all loaded names.
	 * @param {Object} [scope] The scope object to be used for the callback call.
	 */
	load: function( names, callback, scope ) {
		// Ensure that we have an array of names.
		if ( !CKEDITOR.tools.isArray( names ) )
			names = names ? [ names ] : [];

		var loaded = this.loaded,
			registered = this.registered,
			urls = [],
			urlsNames = {},
			resources = {};

		// Loop through all names.
		for ( var i = 0; i < names.length; i++ ) {
			var name = names[ i ];

			if ( !name )
				continue;

			// If not available yet.
			if ( !loaded[ name ] && !registered[ name ] ) {
				var url = this.getFilePath( name );
				urls.push( url );
				if ( !( url in urlsNames ) )
					urlsNames[ url ] = [];
				urlsNames[ url ].push( name );
			} else {
				resources[ name ] = this.get( name );
			}
		}

		CKEDITOR.scriptLoader.load( urls, function( completed, failed ) {
			if ( failed.length ) {
				throw new Error( '[CKEDITOR.resourceManager.load] Resource name "' + urlsNames[ failed[ 0 ] ].join( ',' ) +
					'" was not found at "' + failed[ 0 ] + '".' );
			}

			for ( var i = 0; i < completed.length; i++ ) {
				var nameList = urlsNames[ completed[ i ] ];
				for ( var j = 0; j < nameList.length; j++ ) {
					var name = nameList[ j ];
					resources[ name ] = this.get( name );

					loaded[ name ] = 1;
				}
			}

			callback.call( scope, resources );
		}, this );
	}
};

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Defines the {@link CKEDITOR.plugins} object, which is used to
 *		manage plugins registration and loading.
 */

/**
 * Manages plugins registration and loading.
 *
 * @class
 * @extends CKEDITOR.resourceManager
 * @singleton
 */
CKEDITOR.plugins = new CKEDITOR.resourceManager( 'plugins/', 'plugin' );

// PACKAGER_RENAME( CKEDITOR.plugins )

CKEDITOR.plugins.load = CKEDITOR.tools.override( CKEDITOR.plugins.load, function( originalLoad ) {
	var initialized = {};

	return function( name, callback, scope ) {
		var allPlugins = {};

		var loadPlugins = function( names ) {
				originalLoad.call( this, names, function( plugins ) {
					CKEDITOR.tools.extend( allPlugins, plugins );

					var requiredPlugins = [];
					for ( var pluginName in plugins ) {
						var plugin = plugins[ pluginName ],
							requires = plugin && plugin.requires;

						if ( !initialized[ pluginName ] ) {
							// Register all icons eventually defined by this plugin.
							if ( plugin.icons ) {
								var icons = plugin.icons.split( ',' );
								for ( var ic = icons.length; ic--; ) {
									CKEDITOR.skin.addIcon( icons[ ic ],
										plugin.path +
										'icons/' +
										( CKEDITOR.env.hidpi && plugin.hidpi ? 'hidpi/' : '' ) +
										icons[ ic ] +
										'.png' );
								}
							}

							// Plugin is supported by default (#2692).
							plugin.isSupportedEnvironment = plugin.isSupportedEnvironment || function() {
								return true;
							};

							initialized[ pluginName ] = 1;
						}

						if ( requires ) {
							// Trasnform it into an array, if it's not one.
							if ( requires.split )
								requires = requires.split( ',' );

							for ( var i = 0; i < requires.length; i++ ) {
								if ( !allPlugins[ requires[ i ] ] )
									requiredPlugins.push( requires[ i ] );
							}
						}
					}

					if ( requiredPlugins.length )
						loadPlugins.call( this, requiredPlugins );
					else {
						// Call the "onLoad" function for all plugins.
						for ( pluginName in allPlugins ) {
							plugin = allPlugins[ pluginName ];
							if ( plugin.onLoad && !plugin.onLoad._called ) {
								// Make it possible to return false from plugin::onLoad to disable it.
								if ( plugin.onLoad() === false )
									delete allPlugins[ pluginName ];

								plugin.onLoad._called = 1;
							}
						}

						// Call the callback.
						if ( callback )
							callback.call( scope || window, allPlugins );
					}
				}, this );

			};

		loadPlugins.call( this, name );
	};
} );

/**
 * Loads a specific language file, or auto detect it. A callback is
 * then called when the file gets loaded.
 *
 *		CKEDITOR.plugins.setLang( 'myPlugin', 'en', {
 *			title: 'My plugin',
 *			selectOption: 'Please select an option'
 *		} );
 *
 * @param {String} pluginName The name of the plugin to which the provided translation
 * should be attached.
 * @param {String} languageCode The code of the language translation provided.
 * @param {Object} languageEntries An object that contains pairs of label and
 * the respective translation.
 */
CKEDITOR.plugins.setLang = function( pluginName, languageCode, languageEntries ) {
	var plugin = this.get( pluginName ),
		pluginLangEntries = plugin.langEntries || ( plugin.langEntries = {} ),
		pluginLang = plugin.lang || ( plugin.lang = [] );

	if ( pluginLang.split )
		pluginLang = pluginLang.split( ',' );

	if ( CKEDITOR.tools.indexOf( pluginLang, languageCode ) == -1 )
		pluginLang.push( languageCode );

	pluginLangEntries[ languageCode ] = languageEntries;
};

/**
 * Virtual class that illustrates the API of {@link CKEDITOR.editor} instance plugins dictionary.
 *
 * Such object contains references to all plugins used by a related editor instance.
 *
 * See {@link CKEDITOR.editor#property-plugins} for example use.
 *
 * This class is not really a part of the API, so its constructor can not be called.
 *
 * @abstract
 * @class CKEDITOR.editor.plugins
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * Contains UI features related to an editor instance.
 *
 * @class
 * @mixins CKEDITOR.event
 * @constructor Creates a `ui` class instance.
 * @param {CKEDITOR.editor} editor The editor instance.
 */
CKEDITOR.ui = function( editor ) {
	if ( editor.ui )
		return editor.ui;

	this.items = {};
	this.instances = {};
	this.editor = editor;

	/**
	 * Object used to store private stuff.
	 *
	 * @private
	 */
	this._ = {
		handlers: {}
	};

	return this;
};

// PACKAGER_RENAME( CKEDITOR.ui )

CKEDITOR.ui.prototype = {
	/**
	 * Adds a UI item to the items collection. These items can be later used in
	 * the interface.
	 *
	 *		// Add a new button named 'MyBold'.
	 *		editorInstance.ui.add( 'MyBold', CKEDITOR.UI_BUTTON, {
	 *			label: 'My Bold',
	 *			command: 'bold'
	 *		} );
	 *
	 * @param {String} name The UI item name.
	 * @param {Object} type The item type.
	 * @param {Object} definition The item definition. The properties of this
	 * object depend on the item type.
	 */
	add: function( name, type, definition ) {
		// Compensate the unique name of this ui item to definition.
		definition.name = name.toLowerCase();

		var item = this.items[ name ] = {
			type: type,
			// The name of {@link CKEDITOR.command} which associate with this UI.
			command: definition.command || null,
			args: Array.prototype.slice.call( arguments, 2 )
		};

		CKEDITOR.tools.extend( item, definition );
	},

	/**
	 * Retrieves the created UI objects by name.
	 *
	 * @param {String} name The name of the UI definition.
	 */
	get: function( name ) {
		return this.instances[ name ];
	},

	/**
	 * Gets a UI object.
	 *
	 * @param {String} name The UI item name.
	 * @returns {Object} The UI element.
	 */
	create: function( name ) {
		var item = this.items[ name ],
			handler = item && this._.handlers[ item.type ],
			command = item && item.command && this.editor.getCommand( item.command );

		var result = handler && handler.create.apply( this, item.args );

		this.instances[ name ] = result;

		// Add reference inside command object.
		if ( command )
			command.uiItems.push( result );

		if ( result && !result.type )
			result.type = item.type;

		return result;
	},

	/**
	 * Adds a handler for a UI item type. The handler is responsible for
	 * transforming UI item definitions into UI objects.
	 *
	 * @param {Object} type The item type.
	 * @param {Object} handler The handler definition.
	 */
	addHandler: function( type, handler ) {
		this._.handlers[ type ] = handler;
	},

	/**
	 * Returns the unique DOM element that represents one editor's UI part, also known as "space".
	 * There are 3 main editor spaces available: `top`, `contents` and `bottom`
	 * and their availability depends on editor type.
	 *
	 *		// Hide the bottom space in the UI.
	 *		var bottom = editor.ui.space( 'bottom' );
	 *		bottom.setStyle( 'display', 'none' );
	 *
	 * @param {String} name The name of the space.
	 * @returns {CKEDITOR.dom.element} The element that represents the space.
	 */
	space: function( name ) {
		return CKEDITOR.document.getById( this.spaceId( name ) );
	},

	/**
	 * Returns the HTML ID for a specific UI space name.
	 *
	 * @param {String} name The name of the space.
	 * @returns {String} The ID of an element representing this space in the DOM.
	 */
	spaceId: function( name ) {
		return this.editor.id + '_' + name;
	}
};

CKEDITOR.event.implementOn( CKEDITOR.ui );

/**
 * Internal event fired when a new UI element is ready.
 *
 * @event ready
 * @param {Object} data The new UI element.
 */

/**
 * Virtual class which just illustrates the features of handler objects to be
 * passed to the {@link CKEDITOR.ui#addHandler} function.
 * This class is not really a part of the API, so do not call its constructor.
 *
 * @class CKEDITOR.ui.handlerDefinition
 */

/**
 * Transforms an item definition into a UI item object.
 *
 *		editorInstance.ui.addHandler( CKEDITOR.UI_BUTTON, {
 *			create: function( definition ) {
 *				return new CKEDITOR.ui.button( definition );
 *			}
 *		} );
 *
 * @method create
 * @param {Object} definition The item definition.
 * @returns {Object} The UI element.
 * @todo We lack the "UI element" abstract super class.
 */

/**
 * The element in the {@link CKEDITOR#document host page's document} that contains the editor content.
 * If the {@glink features/uitypes#fixed-user-interface fixed editor UI} is used, then it will be set to
 * `editor.ui.space( 'contents' )` &mdash; i.e. the `<div>` which contains the editor `<iframe>` (in case of classic editor)
 * or {@link CKEDITOR.editable} (in case of inline editor). Otherwise it is set to the {@link CKEDITOR.editable} itself.
 *
 * Use the position of this element if you need to position elements placed in the host page's document relatively to the
 * editor content.
 *
 *		var editor = CKEDITOR.instances.editor1;
 *		console.log( editor.ui.contentsElement.getName() ); // 'div'
 *
 * @since 4.5.0
 * @readonly
 * @property {CKEDITOR.dom.element} contentsElement
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Defines the {@link CKEDITOR.editor} class that represents an
 *		editor instance.
 */

( function() {
	// Override the basic constructor defined at editor_basic.js.
	Editor.prototype = CKEDITOR.editor.prototype;
	CKEDITOR.editor = Editor;

	/**
	 * Represents an editor instance. This constructor should be rarely
	 * used in favor of the {@link CKEDITOR} editor creation functions.
	 *
	 * @class CKEDITOR.editor
	 * @mixins CKEDITOR.event
	 * @constructor Creates an editor class instance.
	 * @param {Object} [instanceConfig] Configuration values for this specific instance.
	 * @param {CKEDITOR.dom.element} [element] The DOM element upon which this editor
	 * will be created.
	 * @param {Number} [mode] The element creation mode to be used by this editor.
	 */
	function Editor( instanceConfig, element, mode ) {
		// Call the CKEDITOR.event constructor to initialize this instance.
		CKEDITOR.event.call( this );

		// Make a clone of the config object, to avoid having it touched by our code. (https://dev.ckeditor.com/ticket/9636)
		instanceConfig = instanceConfig && CKEDITOR.tools.clone( instanceConfig );

		// if editor is created off one page element.
		if ( element !== undefined ) {
			// Asserting element and mode not null.
			if ( !( element instanceof CKEDITOR.dom.element ) )
				throw new Error( 'Expect element of type CKEDITOR.dom.element.' );
			else if ( !mode )
				throw new Error( 'One of the element modes must be specified.' );

			if ( CKEDITOR.env.ie && CKEDITOR.env.quirks && mode == CKEDITOR.ELEMENT_MODE_INLINE )
				throw new Error( 'Inline element mode is not supported on IE quirks.' );

			if ( !isSupportedElement( element, mode ) )
				throw new Error( 'The specified element mode is not supported on element: "' + element.getName() + '".' );

			/**
			 * The original host page element upon which the editor is created. It is only
			 * supposed to be provided by the particular editor creator and is not subject to
			 * be modified.
			 *
			 * @readonly
			 * @property {CKEDITOR.dom.element}
			 */
			this.element = element;

			/**
			 * This property indicates the way this instance is associated with the {@link #element}.
			 * See also {@link CKEDITOR#ELEMENT_MODE_INLINE} and {@link CKEDITOR#ELEMENT_MODE_REPLACE}.
			 *
			 * @readonly
			 * @property {Number}
			 */
			this.elementMode = mode;

			this.name = ( this.elementMode != CKEDITOR.ELEMENT_MODE_APPENDTO ) && ( element.getId() || element.getNameAtt() );
		} else {
			this.elementMode = CKEDITOR.ELEMENT_MODE_NONE;
		}

		// Declare the private namespace.
		this._ = {};

		this.commands = {};

		/**
		 * Contains all UI templates created for this editor instance.
		 *
		 * @readonly
		 * @property {Object}
		 */
		this.templates = {};

		/**
		 * A unique identifier of this editor instance.
		 *
		 * **Note:** It will be originated from the `id` or `name`
		 * attribute of the {@link #element}, otherwise a name pattern of
		 * `'editor{n}'` will be used.
		 *
		 * @readonly
		 * @property {String}
		 */
		this.name = this.name || genEditorName();

		/**
		 * A unique random string assigned to each editor instance on the page.
		 *
		 * @readonly
		 * @property {String}
		 */
		this.id = CKEDITOR.tools.getNextId();

		/**
		 * Indicates editor initialization status. The following statuses are available:
		 *
		 *	* **unloaded**: The initial state &mdash; the editor instance was initialized,
		 *	but its components (configuration, plugins, language files) are not loaded yet.
		 *	* **loaded**: The editor components were loaded &mdash; see the {@link CKEDITOR.editor#loaded} event.
		 *	* **ready**: The editor is fully initialized and ready &mdash; see the {@link CKEDITOR.editor#instanceReady} event.
		 *	* **destroyed**: The editor was destroyed &mdash; see the {@link CKEDITOR.editor#method-destroy} method.
		 *
		 * @since 4.1.0
		 * @readonly
		 * @property {String}
		 */
		this.status = 'unloaded';

		/**
		 * The configuration for this editor instance. It inherits all
		 * settings defined in {@link CKEDITOR.config}, combined with settings
		 * loaded from custom configuration files and those defined inline in
		 * the page when creating the editor.
		 *
		 *		var editor = CKEDITOR.instances.editor1;
		 *		alert( editor.config.skin ); // e.g. 'moono'
		 *
		 * @readonly
		 * @property {CKEDITOR.config}
		 */
		this.config = CKEDITOR.tools.prototypedCopy( CKEDITOR.config );

		/**
		 * The namespace containing UI features related to this editor instance.
		 *
		 * @readonly
		 * @property {CKEDITOR.ui}
		 */
		this.ui = new CKEDITOR.ui( this );

		/**
		 * Controls the focus state of this editor instance. This property
		 * is rarely used for normal API operations. It is mainly
		 * targeted at developers adding UI elements to the editor interface.
		 *
		 * @readonly
		 * @property {CKEDITOR.focusManager}
		 */
		this.focusManager = new CKEDITOR.focusManager( this );

		/**
		 * Controls keystroke typing in this editor instance.
		 *
		 * @readonly
		 * @property {CKEDITOR.keystrokeHandler}
		 */
		this.keystrokeHandler = new CKEDITOR.keystrokeHandler( this );

		// Make the editor update its command states on mode change.
		this.on( 'readOnly', updateCommands );
		this.on( 'selectionChange', function( evt ) {
			updateCommandsContext( this, evt.data.path );
		} );
		this.on( 'activeFilterChange', function() {
			updateCommandsContext( this, this.elementPath(), true );
		} );
		this.on( 'mode', updateCommands );

		// Handle startup focus.
		this.on( 'instanceReady', function() {
			if ( this.config.startupFocus ) {
				if ( this.config.startupFocus === 'end' ) {
					var range = this.createRange();
					range.selectNodeContents( this.editable() );
					range.shrink( CKEDITOR.SHRINK_ELEMENT, true );
					range.collapse();
					this.getSelection().selectRanges( [ range ] );
				}
				this.focus();
			}
		} );

		CKEDITOR.fire( 'instanceCreated', null, this );

		// Add this new editor to the CKEDITOR.instances collections.
		CKEDITOR.add( this );

		// Return the editor instance immediately to enable early stage event registrations.
		CKEDITOR.tools.setTimeout( function() {
			if ( this.status !== 'destroyed' ) {
				initConfig( this, instanceConfig );
			} else {
				CKEDITOR.warn( 'editor-incorrect-destroy' );
			}
		}, 0, this );
	}

	var nameCounter = 0;

	function genEditorName() {
		do {
			var name = 'editor' + ( ++nameCounter );
		}
		while ( CKEDITOR.instances[ name ] );

		return name;
	}

	// Asserting element DTD depending on mode.
	function isSupportedElement( element, mode ) {
		if ( mode == CKEDITOR.ELEMENT_MODE_INLINE )
			return element.is( CKEDITOR.dtd.$editable ) || element.is( 'textarea' );
		else if ( mode == CKEDITOR.ELEMENT_MODE_REPLACE )
			return !element.is( CKEDITOR.dtd.$nonBodyContent );
		return 1;
	}

	function updateCommands() {
		var commands = this.commands,
			name;

		for ( name in commands )
			updateCommand( this, commands[ name ] );
	}

	function updateCommand( editor, cmd ) {
		cmd[ cmd.startDisabled ? 'disable' : editor.readOnly && !cmd.readOnly ? 'disable' : cmd.modes[ editor.mode ] ? 'enable' : 'disable' ]();
	}

	function updateCommandsContext( editor, path, forceRefresh ) {
		// Commands cannot be refreshed without a path. In edge cases
		// it may happen that there's no selection when this function is executed.
		// For example when active filter is changed in https://dev.ckeditor.com/ticket/10877.
		if ( !path )
			return;

		var command,
			name,
			commands = editor.commands;

		for ( name in commands ) {
			command = commands[ name ];

			if ( forceRefresh || command.contextSensitive )
				command.refresh( editor, path );
		}
	}

	// ##### START: Config Privates

	// These function loads custom configuration files and cache the
	// CKEDITOR.editorConfig functions defined on them, so there is no need to
	// download them more than once for several instances.
	var loadConfigLoaded = {};

	function loadConfig( editor ) {
		var customConfig = editor.config.customConfig;

		// Check if there is a custom config to load.
		if ( !customConfig )
			return false;

		customConfig = CKEDITOR.getUrl( customConfig );

		var loadedConfig = loadConfigLoaded[ customConfig ] || ( loadConfigLoaded[ customConfig ] = {} );

		// If the custom config has already been downloaded, reuse it.
		if ( loadedConfig.fn ) {
			// Call the cached CKEDITOR.editorConfig defined in the custom
			// config file for the editor instance depending on it.
			loadedConfig.fn.call( editor, editor.config );

			// If there is no other customConfig in the chain, fire the
			// "configLoaded" event.
			if ( CKEDITOR.getUrl( editor.config.customConfig ) == customConfig || !loadConfig( editor ) )
				editor.fireOnce( 'customConfigLoaded' );
		} else {
			// Load the custom configuration file.
			// To resolve customConfig race conflicts, use scriptLoader#queue
			// instead of scriptLoader#load (https://dev.ckeditor.com/ticket/6504).
			CKEDITOR.scriptLoader.queue( customConfig, function() {
				// If the CKEDITOR.editorConfig function has been properly
				// defined in the custom configuration file, cache it.
				if ( CKEDITOR.editorConfig )
					loadedConfig.fn = CKEDITOR.editorConfig;
				else
					loadedConfig.fn = function() {};

				// Call the load config again. This time the custom
				// config is already cached and so it will get loaded.
				loadConfig( editor );
			} );
		}

		return true;
	}

	function initConfig( editor, instanceConfig ) {
		// Setup the lister for the "customConfigLoaded" event.
		editor.on( 'customConfigLoaded', function() {
			if ( instanceConfig ) {
				// Register the events that may have been set at the instance
				// configuration object.
				if ( instanceConfig.on ) {
					for ( var eventName in instanceConfig.on ) {
						editor.on( eventName, instanceConfig.on[ eventName ] );
					}
				}

				// Overwrite the settings from the in-page config.
				CKEDITOR.tools.extend( editor.config, instanceConfig, true );

				delete editor.config.on;
			}

			onConfigLoaded( editor );
		} );

		// The instance config may override the customConfig setting to avoid
		// loading the default ~/config.js file.
		if ( instanceConfig && instanceConfig.customConfig != null )
			editor.config.customConfig = instanceConfig.customConfig;

		// Load configs from the custom configuration files.
		if ( !loadConfig( editor ) )
			editor.fireOnce( 'customConfigLoaded' );
	}

	// ##### END: Config Privates

	// Set config related properties.
	function onConfigLoaded( editor ) {
		var config = editor.config;

		/**
		 * Indicates the read-only state of this editor. This is a read-only property.
		 * See also {@link CKEDITOR.editor#setReadOnly}.
		 *
		 * @since 3.6.0
		 * @readonly
		 * @property {Boolean}
		 */
		editor.readOnly = isEditorReadOnly();

		function isEditorReadOnly() {
			if ( config.readOnly ) {
				return true;
			}

			if ( editor.elementMode == CKEDITOR.ELEMENT_MODE_INLINE ) {
				if ( editor.element.is( 'textarea' ) ) {
					return editor.element.hasAttribute( 'disabled' ) || editor.element.hasAttribute( 'readonly' );
				} else {
					return editor.element.isReadOnly();
				}
			} else if ( editor.elementMode == CKEDITOR.ELEMENT_MODE_REPLACE ) {
				return editor.element.hasAttribute( 'disabled' ) || editor.element.hasAttribute( 'readonly' );
			}

			return false;
		}

		/**
		 * Indicates that the editor is running in an environment where
		 * no block elements are accepted inside the content.
		 *
		 * This can be for example inline editor based on an `<h1>` element.
		 *
		 * @readonly
		 * @property {Boolean}
		 */
		editor.blockless = editor.elementMode == CKEDITOR.ELEMENT_MODE_INLINE ?
			!( editor.element.is( 'textarea' ) || CKEDITOR.dtd[ editor.element.getName() ].p ) :
			false;

		/**
		 * The [tabbing navigation](http://en.wikipedia.org/wiki/Tabbing_navigation) order determined for this editor instance.
		 * This can be set by the <code>{@link CKEDITOR.config#tabIndex}</code>
		 * setting or taken from the `tabindex` attribute of the
		 * {@link #element} associated with the editor.
		 *
		 *		alert( editor.tabIndex ); // e.g. 0
		 *
		 * @readonly
		 * @property {Number} [=0]
		 */
		editor.tabIndex = config.tabIndex || editor.element && editor.element.getAttribute( 'tabindex' ) || 0;

		editor.activeEnterMode = editor.enterMode = validateEnterMode( editor, config.enterMode );
		editor.activeShiftEnterMode = editor.shiftEnterMode = validateEnterMode( editor, config.shiftEnterMode );

		// Set CKEDITOR.skinName. Note that it is not possible to have
		// different skins on the same page, so the last one to set it "wins".
		if ( config.skin )
			CKEDITOR.skinName = config.skin;

		// Fire the "configLoaded" event.
		editor.fireOnce( 'configLoaded' );

		initComponents( editor );
	}

	// Various other core components that read editor configuration.
	function initComponents( editor ) {
		// Documented in dataprocessor.js.
		editor.dataProcessor = new CKEDITOR.htmlDataProcessor( editor );

		// Set activeFilter directly to avoid firing event.
		editor.filter = editor.activeFilter = new CKEDITOR.filter( editor );

		loadSkin( editor );
	}

	function loadSkin( editor ) {
		CKEDITOR.skin.loadPart( 'editor', function() {
			loadLang( editor );
		} );
	}

	function loadLang( editor ) {
		CKEDITOR.lang.load( editor.config.language, editor.config.defaultLanguage, function( languageCode, lang ) {
			var configTitle = editor.config.title;

			/**
			 * The code for the language resources that have been loaded
			 * for the user interface elements of this editor instance.
			 *
			 *		alert( editor.langCode ); // e.g. 'en'
			 *
			 * @readonly
			 * @property {String}
			 */
			editor.langCode = languageCode;

			/**
			 * An object that contains all language strings used by the editor interface.
			 *
			 *		alert( editor.lang.basicstyles.bold ); // e.g. 'Negrito' (if the language is set to Portuguese)
			 *
			 * @readonly
			 * @property {Object} lang
			 */
			// As we'll be adding plugin specific entries that could come
			// from different language code files, we need a copy of lang,
			// not a direct reference to it.
			editor.lang = CKEDITOR.tools.prototypedCopy( lang );

			/**
			 * Indicates the human-readable title of this editor. Although this is a read-only property,
			 * it can be initialized with {@link CKEDITOR.config#title}.
			 *
			 * **Note:** Please do not confuse this property with {@link CKEDITOR.editor#name editor.name}
			 * which identifies the instance in the {@link CKEDITOR#instances} literal.
			 *
			 * @since 4.2.0
			 * @readonly
			 * @property {String/Boolean}
			 */
			editor.title = typeof configTitle == 'string' || configTitle === false ? configTitle : [ editor.lang.editor, editor.name ].join( ', ' );

			if ( !editor.config.contentsLangDirection ) {
				// Fallback to either the editable element direction or editor UI direction depending on creators.
				editor.config.contentsLangDirection = editor.elementMode == CKEDITOR.ELEMENT_MODE_INLINE ? editor.element.getDirection( 1 ) : editor.lang.dir;
			}

			editor.fire( 'langLoaded' );

			preloadStylesSet( editor );
		} );
	}

	// Preloads styles set file (config.stylesSet).
	// If stylesSet was defined directly (by an array)
	// this function will call loadPlugins fully synchronously.
	// If stylesSet is a string (path) loadPlugins will
	// be called asynchronously.
	// In both cases - styles will be preload before plugins initialization.
	function preloadStylesSet( editor ) {
		editor.getStylesSet( function( styles ) {
			// Wait for editor#loaded, so plugins could add their listeners.
			// But listen with high priority to fire editor#stylesSet before editor#uiReady and editor#setData.
			editor.once( 'loaded', function() {
				// Note: we can't use fireOnce because this event may canceled and fired again.
				editor.fire( 'stylesSet', { styles: styles } );
			}, null, null, 1 );

			loadPlugins( editor );
		} );
	}

	function loadPlugins( editor ) {
		var config = editor.config,
			plugins = parsePluginsOption( config.plugins ),
			extraPlugins = parsePluginsOption( config.extraPlugins ),
			removePlugins = parsePluginsOption( config.removePlugins );

		if ( extraPlugins ) {
			// Remove them first to avoid duplications.
			var extraRegex = new RegExp( '(?:^|,)(?:' + extraPlugins.replace( /,/g, '|' ) + ')(?=,|$)', 'g' );
			plugins = plugins.replace( extraRegex, '' );

			plugins += ',' + extraPlugins;
		}

		if ( removePlugins ) {
			var removeRegex = new RegExp( '(?:^|,)(?:' + removePlugins.replace( /,/g, '|' ) + ')(?=,|$)', 'g' );
			plugins = plugins.replace( removeRegex, '' );
		}

		// Load the Adobe AIR plugin conditionally.
		CKEDITOR.env.air && ( plugins += ',adobeair' );

		// Load all plugins defined in the "plugins" setting.
		CKEDITOR.plugins.load( plugins.split( ',' ), function( plugins ) {
			// The list of plugins.
			var pluginsArray = [];

			// The language code to get loaded for each plugin. Null
			// entries will be appended for plugins with no language files.
			var languageCodes = [];

			// The list of URLs to language files.
			var languageFiles = [];

			editor.plugins = CKEDITOR.tools.extend( {}, editor.plugins, plugins );

			// Loop through all plugins, to build the list of language
			// files to get loaded.
			//
			// Check also whether any of loaded plugins doesn't require plugins
			// defined in config.removePlugins. Throw non-blocking error if this happens.
			for ( var pluginName in plugins ) {
				var plugin = plugins[ pluginName ],
					pluginLangs = plugin.lang,
					lang = null,
					requires = plugin.requires,
					match, name;

				// Transform it into a string, if it's not one.
				if ( CKEDITOR.tools.isArray( requires ) )
					requires = requires.join( ',' );

				if ( requires && ( match = requires.match( removeRegex ) ) ) {
					while ( ( name = match.pop() ) ) {
						CKEDITOR.error( 'editor-plugin-required', { plugin: name.replace( ',', '' ), requiredBy: pluginName } );
					}
				}

				// If the plugin has "lang".
				if ( pluginLangs && !editor.lang[ pluginName ] ) {
					// Trasnform the plugin langs into an array, if it's not one.
					if ( pluginLangs.split )
						pluginLangs = pluginLangs.split( ',' );

					// Resolve the plugin language. If the current language
					// is not available, get English or the first one.
					if ( CKEDITOR.tools.indexOf( pluginLangs, editor.langCode ) >= 0 )
						lang = editor.langCode;
					else {
						// The language code may have the locale information (zh-cn).
						// Fall back to locale-less in that case (zh).
						var langPart = editor.langCode.replace( /-.*/, '' );
						if ( langPart != editor.langCode && CKEDITOR.tools.indexOf( pluginLangs, langPart ) >= 0 )
							lang = langPart;
						// Try the only "generic" option we have: English.
						else if ( CKEDITOR.tools.indexOf( pluginLangs, 'en' ) >= 0 )
							lang = 'en';
						else
							lang = pluginLangs[ 0 ];
					}

					if ( !plugin.langEntries || !plugin.langEntries[ lang ] ) {
						// Put the language file URL into the list of files to
						// get downloaded.
						languageFiles.push( CKEDITOR.getUrl( plugin.path + 'lang/' + lang + '.js' ) );
					} else {
						editor.lang[ pluginName ] = plugin.langEntries[ lang ];
						lang = null;
					}
				}

				// Save the language code, so we know later which
				// language has been resolved to this plugin.
				languageCodes.push( lang );

				pluginsArray.push( plugin );
			}

			// Load all plugin specific language files in a row.
			CKEDITOR.scriptLoader.load( languageFiles, function() {
				// Initialize all plugins that have the "beforeInit" and "init" methods defined.
				var methods = [ 'beforeInit', 'init', 'afterInit' ];
				for ( var m = 0; m < methods.length; m++ ) {
					for ( var i = 0; i < pluginsArray.length; i++ ) {
						var plugin = pluginsArray[ i ];

						// Uses the first loop to update the language entries also.
						if ( m === 0 && languageCodes[ i ] && plugin.lang && plugin.langEntries )
							editor.lang[ plugin.name ] = plugin.langEntries[ languageCodes[ i ] ];

						// Call the plugin method (beforeInit and init).
						if ( plugin[ methods[ m ] ] )
							plugin[ methods[ m ] ]( editor );
					}
				}

				editor.fireOnce( 'pluginsLoaded' );

				// Setup the configured keystrokes.
				config.keystrokes && editor.setKeystroke( editor.config.keystrokes );

				// Setup the configured blocked keystrokes.
				for ( i = 0; i < editor.config.blockedKeystrokes.length; i++ )
					editor.keystrokeHandler.blockedKeystrokes[ editor.config.blockedKeystrokes[ i ] ] = 1;

				editor.status = 'loaded';
				editor.fireOnce( 'loaded' );
				CKEDITOR.fire( 'instanceLoaded', null, editor );
			} );
		} );

		// Parse *plugins option into a string (#1802).
		function parsePluginsOption( option ) {
			if ( !option ) {
				return '';
			}

			if ( CKEDITOR.tools.isArray( option ) ) {
				option = option.join( ',' );
			}

			// We have to remove whitespaces (#1712).
			return option.replace( /\s/g, '' );
		}
	}

	// Send to data output back to editor's associated element.
	function updateEditorElement() {
		var element = this.element;

		// Some editor creation mode will not have the
		// associated element.
		if ( element && this.elementMode != CKEDITOR.ELEMENT_MODE_APPENDTO ) {
			var data = this.getData();

			if ( this.config.htmlEncodeOutput )
				data = CKEDITOR.tools.htmlEncode( data );

			if ( element.is( 'textarea' ) )
				element.setValue( data );
			else
				element.setHtml( data );

			return true;
		}
		return false;
	}

	// Always returns ENTER_BR in case of blockless editor.
	function validateEnterMode( editor, enterMode ) {
		return editor.blockless ? CKEDITOR.ENTER_BR : enterMode;
	}

	// Create DocumentFragment from specified ranges. For now it handles only tables
	// and returns DocumentFragment from the 1. range for other cases. (https://dev.ckeditor.com/ticket/13884)
	function createDocumentFragmentFromRanges( ranges, editable ) {
		var docFragment = new CKEDITOR.dom.documentFragment(),
			tableClone,
			currentRow,
			currentRowClone;

		// We must handle two cases here:
		// 1. <tr>[<td>Cell</td>]</tr> (IE9+, Edge, Chrome, Firefox)
		// 2. <td>[Cell]</td> (IE8-, Safari)
		function isSelectedCell( range ) {
			var start = range.startContainer,
				end = range.endContainer;

			if ( start.is && ( start.is( 'tr' ) ||
				( start.is( 'td' ) && start.equals( end ) && range.endOffset === start.getChildCount() ) ) ) {
				return true;
			}

			return false;
		}

		function cloneCell( range ) {
			var start = range.startContainer;

			if ( start.is( 'tr' ) ) {
				return range.cloneContents();
			}

			return start.clone( true );
		}

		for ( var i = 0; i < ranges.length; i++ ) {
			var range = ranges[ i ],
				container = range.startContainer.getAscendant( 'tr', true );

			if ( isSelectedCell( range ) ) {
				if ( !tableClone ) {
					tableClone = container.getAscendant( 'table' ).clone();
					tableClone.append( container.getAscendant( { thead: 1, tbody: 1, tfoot: 1 } ).clone() );
					docFragment.append( tableClone );
					tableClone = tableClone.findOne( 'thead, tbody, tfoot' );
				}

				if ( !( currentRow && currentRow.equals( container ) ) ) {
					currentRow = container;
					currentRowClone = container.clone();
					tableClone.append( currentRowClone );
				}

				currentRowClone.append( cloneCell( range ) );
			} else {
				// If there was something else copied with table,
				// append it to DocumentFragment.
				docFragment.append( range.cloneContents() );
			}
		}

		if ( !tableClone ) {
			return editable.getHtmlFromRange( ranges[ 0 ] );
		}

		return docFragment;
	}

	CKEDITOR.tools.extend( CKEDITOR.editor.prototype, {
		/**
		 * An object that contains references to all plugins used by this
		 * editor instance.
		 *
		 *		alert( editor.plugins.dialog.path ); // e.g. 'http://example.com/ckeditor/plugins/dialog/'
		 *
		 *		// Check if a plugin is available.
		 *		if ( editor.plugins.image ) {
		 *			...
		 *		}
		 *
		 * @readonly
		 * @property {CKEDITOR.editor.plugins}
		 */
		plugins: {
			/**
			 * Checks the plugin for conflicts with other plugins.
			 *
			 * If a conflict occurs, this function will send a {@link CKEDITOR#warn console warning}
			 * with the `editor-plugin-conflict` error code. The order of the `conflicted` names is respected
			 * where the first conflicted plugin has the highest priority and will be used in a warning
			 * message.
			 *
			 * ```js
			 * editor.plugins.detectConflict( 'image', [ 'image2', 'easyimage' ] );
			 * ```
			 *
			 * @member CKEDITOR.editor.plugins
			 * @since 4.10.1
			 * @param {String} plugin Current plugin name.
			 * @param {String[]} conflicted Names of plugins that conflict with the current plugin.
			 * @return {Boolean} Returns `true` if there is a conflict. Returns `false` otherwise.
			 */
			detectConflict: function( plugin, conflicted ) {
				for ( var i = 0; i < conflicted.length; i++ ) {
					var pluginName = conflicted[ i ];

					if ( this[ pluginName ] ) {
						CKEDITOR.warn( 'editor-plugin-conflict', {
							plugin: plugin,
							replacedWith: pluginName
						} );

						return true;
					}
				}

				return false;
			}
		},
		/**
		 * Adds a command definition to the editor instance. Commands added with
		 * this function can be executed later with the {@link #execCommand} method.
		 *
		 * 		editorInstance.addCommand( 'sample', {
		 * 			exec: function( editor ) {
		 * 				alert( 'Executing a command for the editor name "' + editor.name + '"!' );
		 * 			}
		 * 		} );
		 *
		 * Since 4.10.0 this method also accepts a {@link CKEDITOR.command} instance as a parameter.
		 *
		 * @param {String} commandName The indentifier name of the command.
		 * @param {CKEDITOR.commandDefinition/CKEDITOR.command} commandDefinition The command definition or a `CKEDITOR.command` instance.
		 */
		addCommand: function( commandName, commandDefinition ) {
			commandDefinition.name = commandName.toLowerCase();
			var cmd = commandDefinition instanceof CKEDITOR.command ? commandDefinition : new CKEDITOR.command( this, commandDefinition );

			// Update command when mode is set.
			// This guarantees that commands added before first editor#mode
			// aren't immediately updated, but waits for editor#mode and that
			// commands added later are immediately refreshed, even when added
			// before instanceReady. https://dev.ckeditor.com/ticket/10103, https://dev.ckeditor.com/ticket/10249
			if ( this.mode )
				updateCommand( this, cmd );

			return this.commands[ commandName ] = cmd;
		},

		/**
		 * Attaches the editor to a form to call {@link #updateElement} before form submission.
		 * This method is called by both creators ({@link CKEDITOR#replace replace} and
		 * {@link CKEDITOR#inline inline}), so there is no reason to call it manually.
		 *
		 * @private
		 */
		_attachToForm: function() {
			var editor = this,
				element = editor.element,
				form = new CKEDITOR.dom.element( element.$.form );

			// If are replacing a textarea, we must
			if ( element.is( 'textarea' ) ) {
				if ( form ) {
					form.on( 'submit', onSubmit );

					// Check if there is no element/elements input with name == "submit".
					// If they exists they will overwrite form submit function (form.$.submit).
					// If form.$.submit is overwritten we can not do anything with it.
					if ( isFunction( form.$.submit ) ) {
						// Setup the submit function because it doesn't fire the
						// "submit" event.
						form.$.submit = CKEDITOR.tools.override( form.$.submit, function( originalSubmit ) {
							return function() {
								onSubmit();

								// For IE, the DOM submit function is not a
								// function, so we need third check.
								if ( originalSubmit.apply )
									originalSubmit.apply( this );
								else
									originalSubmit();
							};
						} );
					}

					// Remove 'submit' events registered on form element before destroying.(https://dev.ckeditor.com/ticket/3988)
					editor.on( 'destroy', function() {
						form.removeListener( 'submit', onSubmit );
					} );
				}
			}

			function onSubmit( evt ) {
				editor.updateElement();

				// https://dev.ckeditor.com/ticket/8031 If textarea had required attribute and editor is empty fire 'required' event and if
				// it was cancelled, prevent submitting the form.
				if ( editor._.required && !element.getValue() && editor.fire( 'required' ) === false ) {
					// When user press save button event (evt) is undefined (see save plugin).
					// This method works because it throws error so originalSubmit won't be called.
					// Also this error won't be shown because it will be caught in save plugin.
					evt.data.preventDefault();
				}
			}

			function isFunction( f ) {
				// For IE8 typeof fun == object so we cannot use it.
				return !!( f && f.call && f.apply );
			}
		},

		/**
		 * Destroys the editor instance, releasing all resources used by it.
		 * If the editor replaced an element, the element will be recovered.
		 *
		 *		alert( CKEDITOR.instances.editor1 ); // e.g. object
		 *		CKEDITOR.instances.editor1.destroy();
		 *		alert( CKEDITOR.instances.editor1 ); // undefined
		 *
		 * @param {Boolean} [noUpdate] If the instance is replacing a DOM
		 * element, this parameter indicates whether or not to update the
		 * element with the instance content.
		 */
		destroy: function( noUpdate ) {
			var filters = CKEDITOR.filter.instances,
				self = this;

			this.fire( 'beforeDestroy' );

			!noUpdate && updateEditorElement.call( this );

			this.editable( null );

			if ( this.filter ) {
				delete this.filter;
			}

			// Destroy filters attached to the editor (#1722).
			CKEDITOR.tools.array.forEach( CKEDITOR.tools.object.keys( filters ), function( id ) {
				var filter = filters[ id ];
				if ( self === filter.editor ) {
					filter.destroy();
				}
			} );

			delete this.activeFilter;

			this.status = 'destroyed';

			this.fire( 'destroy' );

			// Plug off all listeners to prevent any further events firing.
			this.removeAllListeners();

			CKEDITOR.remove( this );
			CKEDITOR.fire( 'instanceDestroyed', null, this );
		},

		/**
		 * Returns an {@link CKEDITOR.dom.elementPath element path} for the selection in the editor.
		 *
		 * @param {CKEDITOR.dom.node} [startNode] From which the path should start,
		 * if not specified defaults to editor selection's
		 * start element yielded by {@link CKEDITOR.dom.selection#getStartElement}.
		 * @returns {CKEDITOR.dom.elementPath}
		 */
		elementPath: function( startNode ) {
			if ( !startNode ) {
				var sel = this.getSelection();
				if ( !sel )
					return null;

				startNode = sel.getStartElement();
			}

			return startNode ? new CKEDITOR.dom.elementPath( startNode, this.editable() ) : null;
		},

		/**
		 * Shortcut to create a {@link CKEDITOR.dom.range} instance from the editable element.
		 *
		 * @returns {CKEDITOR.dom.range} The DOM range created if the editable has presented.
		 * @see CKEDITOR.dom.range
		 */
		createRange: function() {
			var editable = this.editable();
			return editable ? new CKEDITOR.dom.range( editable ) : null;
		},

		/**
		 * Executes a command associated with the editor.
		 *
		 *		editorInstance.execCommand( 'bold' );
		 *
		 * @param {String} commandName The identifier name of the command.
		 * @param {Object} [data] The data to be passed to the command. It defaults to
		 * an empty object starting from 4.7.0.
		 * @returns {Boolean} `true` if the command was executed successfully, `false` otherwise.
		 * @see CKEDITOR.editor#addCommand
		 */
		execCommand: function( commandName, data ) {
			var command = this.getCommand( commandName );

			var eventData = {
				name: commandName,
				commandData: data || {},
				command: command
			};

			if ( command && command.state != CKEDITOR.TRISTATE_DISABLED ) {
				if ( this.fire( 'beforeCommandExec', eventData ) !== false ) {
					eventData.returnValue = command.exec( eventData.commandData );

					// Fire the 'afterCommandExec' immediately if command is synchronous.
					if ( !command.async && this.fire( 'afterCommandExec', eventData ) !== false )
						return eventData.returnValue;
				}
			}

			// throw 'Unknown command name "' + commandName + '"';
			return false;
		},

		/**
		 * Gets one of the registered commands. Note that after registering a
		 * command definition with {@link #addCommand}, it is
		 * transformed internally into an instance of
		 * {@link CKEDITOR.command}, which will then be returned by this function.
		 *
		 * @param {String} commandName The name of the command to be returned.
		 * This is the same name that is used to register the command with `addCommand`.
		 * @returns {CKEDITOR.command} The command object identified by the provided name.
		 */
		getCommand: function( commandName ) {
			return this.commands[ commandName ];
		},

		/**
		 * Gets the editor data. The data will be in "raw" format. It is the same
		 * data that is posted by the editor.
		 *
		 *		if ( CKEDITOR.instances.editor1.getData() == '' )
		 *			alert( 'There is no data available.' );
		 *
		 * @param {Boolean} internal If set to `true`, it will prevent firing the
		 * {@link CKEDITOR.editor#beforeGetData} and {@link CKEDITOR.editor#event-getData} events, so
		 * the real content of the editor will not be read and cached data will be returned. The method will work
		 * much faster, but this may result in the editor returning the data that is not up to date. This parameter
		 * should thus only be set to `true` when you are certain that the cached data is up to date.
		 *
		 * @returns {String} The editor data.
		 */
		getData: function( internal ) {
			!internal && this.fire( 'beforeGetData' );

			var eventData = this._.data;

			if ( typeof eventData != 'string' ) {
				var element = this.element;
				if ( element && this.elementMode == CKEDITOR.ELEMENT_MODE_REPLACE )
					eventData = element.is( 'textarea' ) ? element.getValue() : element.getHtml();
				else
					eventData = '';
			}

			eventData = { dataValue: eventData };

			// Fire "getData" so data manipulation may happen.
			!internal && this.fire( 'getData', eventData );

			return eventData.dataValue;
		},

		/**
		 * Gets the "raw data" currently available in the editor. This is a
		 * fast method which returns the data as is, without processing, so it is
		 * not recommended to use it on resulting pages. Instead it can be used
		 * combined with the {@link #method-loadSnapshot} method in order
		 * to automatically save the editor data from time to time
		 * while the user is using the editor, to avoid data loss, without risking
		 * performance issues.
		 *
		 *		alert( editor.getSnapshot() );
		 *
		 * See also:
		 *
		 * * {@link CKEDITOR.editor#method-getData}.
		 *
		 * @returns {String} Editor "raw data".
		 */
		getSnapshot: function() {
			var data = this.fire( 'getSnapshot' );

			if ( typeof data != 'string' ) {
				var element = this.element;

				if ( element && this.elementMode == CKEDITOR.ELEMENT_MODE_REPLACE ) {
					data = element.is( 'textarea' ) ? element.getValue() : element.getHtml();
				}
				else {
					// If we don't have a proper element, set data to an empty string,
					// as this method is expected to return a string. (https://dev.ckeditor.com/ticket/13385)
					data = '';
				}
			}

			return data;
		},

		/**
		 * Loads "raw data" into the editor. The data is loaded with processing
		 * straight to the editing area. It should not be used as a way to load
		 * any kind of data, but instead in combination with
		 * {@link #method-getSnapshot}-produced data.
		 *
		 *		var data = editor.getSnapshot();
		 *		editor.loadSnapshot( data );
		 *
		 * @see CKEDITOR.editor#setData
		 */
		loadSnapshot: function( snapshot ) {
			this.fire( 'loadSnapshot', snapshot );
		},

		/**
		 * Sets the editor data. The data must be provided in the "raw" format (HTML).
		 *
		 * Note that this method is asynchronous. The `callback` parameter must
		 * be used if interaction with the editor is needed after setting the data.
		 *
		 *		CKEDITOR.instances.editor1.setData( '<p>This is the editor data.</p>' );
		 *
		 *		CKEDITOR.instances.editor1.setData( '<p>Some other editor data.</p>', {
		 *			callback: function() {
		 *				this.checkDirty(); // true
		 *			}
		 *		} );
		 *
		 * Note: In **CKEditor 4.4.2** the signature of this method has changed. All arguments
		 * except `data` were wrapped into the `options` object. However, backward compatibility
		 * was preserved and it is still possible to use the `data, callback, internal` arguments.
		 *
		 *
		 * @param {String} data The HTML code to replace current editor content.
		 * @param {Object} [options]
		 * @param {Boolean} [options.internal=false] Whether to suppress any event firing when copying data internally inside the editor.
		 * @param {Function} [options.callback] Function to be called after `setData` is completed (on {@link #dataReady}).
		 * @param {Boolean} [options.noSnapshot=false] If set to `true`, it will prevent recording an undo snapshot.
		 * Introduced in CKEditor 4.4.2.
		 */
		setData: function( data, options, internal ) {
			var fireSnapshot = true,
				// Backward compatibility.
				callback = options,
				eventData;

			if ( options && typeof options == 'object' ) {
				internal = options.internal;
				callback = options.callback;
				fireSnapshot = !options.noSnapshot;
			}

			if ( !internal && fireSnapshot )
				this.fire( 'saveSnapshot' );

			if ( callback || !internal ) {
				this.once( 'dataReady', function( evt ) {
					if ( !internal && fireSnapshot )
						this.fire( 'saveSnapshot' );

					if ( callback )
						callback.call( evt.editor );
				} );
			}

			// Fire "setData" so data manipulation may happen.
			eventData = { dataValue: data };
			!internal && this.fire( 'setData', eventData );

			this._.data = eventData.dataValue;

			!internal && this.fire( 'afterSetData', eventData );
		},

		/**
		 * Puts or restores the editor into the read-only state. When in read-only,
		 * the user is not able to change the editor content, but can still use
		 * some editor features. This function sets the {@link #property-readOnly}
		 * property of the editor, firing the {@link #event-readOnly} event.
		 *
		 * **Note:** The current editing area will be reloaded.
		 *
		 * @since 3.6.0
		 * @param {Boolean} [isReadOnly] Indicates that the editor must go
		 * read-only (`true`, default) or be restored and made editable (`false`).
		 */
		setReadOnly: function( isReadOnly ) {
			isReadOnly = ( isReadOnly == null ) || isReadOnly;

			if ( this.readOnly != isReadOnly ) {
				this.readOnly = isReadOnly;

				// Block or release BACKSPACE key according to current read-only
				// state to prevent browser's history navigation (https://dev.ckeditor.com/ticket/9761).
				this.keystrokeHandler.blockedKeystrokes[ 8 ] = +isReadOnly;

				this.editable().setReadOnly( isReadOnly );

				// Fire the readOnly event so the editor features can update
				// their state accordingly.
				this.fire( 'readOnly' );
			}
		},

		/**
		 * Inserts HTML code into the currently selected position in the editor in WYSIWYG mode.
		 *
		 * Example:
		 *
		 *		CKEDITOR.instances.editor1.insertHtml( '<p>This is a new paragraph.</p>' );
		 *
		 * Fires the {@link #event-insertHtml} and {@link #event-afterInsertHtml} events. The HTML is inserted
		 * in the {@link #event-insertHtml} event's listener with a default priority (10) so you can add listeners with
		 * lower or higher priorities in order to execute some code before or after the HTML is inserted.
		 *
		 * @param {String} html HTML code to be inserted into the editor.
		 * @param {String} [mode='html'] The mode in which the HTML code will be inserted. One of the following:
		 *
		 * * `'html'` &ndash; The inserted content  will completely override the styles at the selected position.
		 * * `'unfiltered_html'` &ndash; Like `'html'` but the content is not filtered with {@link CKEDITOR.filter}.
		 * * `'text'` &ndash; The inserted content will inherit the styles applied in
		 *    the selected position. This mode should be used when inserting "htmlified" plain text
		 *    (HTML without inline styles and styling elements like `<b>`, `<strong>`, `<span style="...">`).
		 *
		 * @param {CKEDITOR.dom.range} [range] If specified, the HTML will be inserted into the range
		 * instead of into the selection. The selection will be placed at the end of the insertion (like in the normal case).
		 * Introduced in CKEditor 4.5.
		 */
		insertHtml: function( html, mode, range ) {
			this.fire( 'insertHtml', { dataValue: html, mode: mode, range: range } );
		},

		/**
		 * Inserts text content into the currently selected position in the
		 * editor in WYSIWYG mode. The styles of the selected element will be applied to the inserted text.
		 * Spaces around the text will be left untouched.
		 *
		 *		CKEDITOR.instances.editor1.insertText( ' line1 \n\n line2' );
		 *
		 * Fires the {@link #event-insertText} and {@link #event-afterInsertHtml} events. The text is inserted
		 * in the {@link #event-insertText} event's listener with a default priority (10) so you can add listeners with
		 * lower or higher priorities in order to execute some code before or after the text is inserted.
		 *
		 * @since 3.5.0
		 * @param {String} text Text to be inserted into the editor.
		 */
		insertText: function( text ) {
			this.fire( 'insertText', text );
		},

		/**
		 * Inserts an element into the currently selected position in the editor in WYSIWYG mode.
		 *
		 *		var element = CKEDITOR.dom.element.createFromHtml( '<img src="hello.png" border="0" title="Hello" />' );
		 *		CKEDITOR.instances.editor1.insertElement( element );
		 *
		 * Fires the {@link #event-insertElement} event. The element is inserted in the listener with a default priority (10),
		 * so you can add listeners with lower or higher priorities in order to execute some code before or after
		 * the element is inserted.
		 *
		 * @param {CKEDITOR.dom.element} element The element to be inserted into the editor.
		 */
		insertElement: function( element ) {
			this.fire( 'insertElement', element );
		},

		/**
		 * Gets the selected HTML (it is returned as a {@link CKEDITOR.dom.documentFragment document fragment}
		 * or a string). This method is designed to work as the user would expect the copy functionality to work.
		 * For instance, if the following selection was made:
		 *
		 *		<p>a<b>b{c}d</b>e</p>
		 *
		 * The following HTML will be returned:
		 *
		 *		<b>c</b>
		 *
		 * As you can see, the information about the bold formatting was preserved, even though the selection was
		 * anchored inside the `<b>` element.
		 *
		 * See also:
		 *
		 * * the {@link #extractSelectedHtml} method,
		 * * the {@link CKEDITOR.editable#getHtmlFromRange} method.
		 *
		 * @since 4.5.0
		 * @param {Boolean} [toString] If `true`, then stringified HTML will be returned.
		 * @returns {CKEDITOR.dom.documentFragment/String}
		 */
		getSelectedHtml: function( toString ) {
			var editable = this.editable(),
				selection = this.getSelection(),
				ranges = selection && selection.getRanges();

			if ( !editable || !ranges || ranges.length === 0 ) {
				return null;
			}

			var docFragment = createDocumentFragmentFromRanges( ranges, editable );

			return toString ? docFragment.getHtml() : docFragment;
		},

		/**
		 * Gets the selected HTML (it is returned as a {@link CKEDITOR.dom.documentFragment document fragment}
		 * or a string) and removes the selected part of the DOM. This method is designed to work as the user would
		 * expect the cut and delete functionalities to work.
		 *
		 * See also:
		 *
		 * * the {@link #getSelectedHtml} method,
		 * * the {@link CKEDITOR.editable#extractHtmlFromRange} method.
		 *
		 * @since 4.5.0
		 * @param {Boolean} [toString] If `true`, then stringified HTML will be returned.
		 * @param {Boolean} [removeEmptyBlock=false] Default `false` means that the function will keep an empty block (if the
		 * entire content was removed) or it will create it (if a block element was removed) and set the selection in that block.
		 * If `true`, the empty block will be removed or not created. In this case the function will not handle the selection.
		 * @returns {CKEDITOR.dom.documentFragment/String/null}
		 */
		extractSelectedHtml: function( toString, removeEmptyBlock ) {
			var editable = this.editable(),
				ranges = this.getSelection().getRanges(),
				docFragment = new CKEDITOR.dom.documentFragment(),
				i;

			if ( !editable || ranges.length === 0 ) {
				return null;
			}

			for ( i = 0; i < ranges.length; i++ ) {
				docFragment.append( editable.extractHtmlFromRange( ranges[ i ], removeEmptyBlock ) );
			}

			if ( !removeEmptyBlock ) {
				this.getSelection().selectRanges( [ ranges[ 0 ] ] );
			}

			return toString ? docFragment.getHtml() : docFragment;
		},

		/**
		 * Moves the selection focus to the editing area space in the editor.
		 */
		focus: function() {
			this.fire( 'beforeFocus' );
		},

		/**
		 * Checks whether the current editor content contains changes when
		 * compared to the content loaded into the editor at startup, or to
		 * the content available in the editor when {@link #resetDirty}
		 * was called.
		 *
		 *		function beforeUnload( evt ) {
		 *			if ( CKEDITOR.instances.editor1.checkDirty() )
		 *				return evt.returnValue = "You will lose the changes made in the editor.";
		 *		}
		 *
		 *		if ( window.addEventListener )
		 *			window.addEventListener( 'beforeunload', beforeUnload, false );
		 *		else
		 *			window.attachEvent( 'onbeforeunload', beforeUnload );
		 *
		 * @returns {Boolean} `true` if the content contains changes.
		 */
		checkDirty: function() {
			return this.status == 'ready' && this._.previousValue !== this.getSnapshot();
		},

		/**
		 * Resets the "dirty state" of the editor so subsequent calls to
		 * {@link #checkDirty} will return `false` if the user will not
		 * have made further changes to the content.
		 *
		 *		alert( editor.checkDirty() ); // e.g. true
		 *		editor.resetDirty();
		 *		alert( editor.checkDirty() ); // false
		 */
		resetDirty: function() {
			this._.previousValue = this.getSnapshot();
		},

		/**
		 * Updates the `<textarea>` element that was replaced by the editor with
		 * the current data available in the editor.
		 *
		 * **Note:** This method will only affect those editor instances created
		 * with the {@link CKEDITOR#ELEMENT_MODE_REPLACE} element mode or inline instances
		 * bound to `<textarea>` elements.
		 *
		 *		CKEDITOR.instances.editor1.updateElement();
		 *		alert( document.getElementById( 'editor1' ).value ); // The current editor data.
		 *
		 * @see CKEDITOR.editor#element
		 */
		updateElement: function() {
			return updateEditorElement.call( this );
		},

		/**
		 * Assigns keystrokes associated with editor commands.
		 *
		 *		editor.setKeystroke( CKEDITOR.CTRL + 115, 'save' );	// Assigned Ctrl+S to the "save" command.
		 *		editor.setKeystroke( CKEDITOR.CTRL + 115, false );	// Disabled Ctrl+S keystroke assignment.
		 *		editor.setKeystroke( [
		 *			[ CKEDITOR.ALT + 122, false ],
		 *			[ CKEDITOR.CTRL + 121, 'link' ],
		 *			[ CKEDITOR.SHIFT + 120, 'bold' ]
		 *		] );
		 *
		 * This method may be used in the following cases:
		 *
		 * * By plugins (like `link` or `basicstyles`) to set their keystrokes when plugins are being loaded.
		 * * During the runtime to modify existing keystrokes.
		 *
		 * The editor handles keystroke configuration in the following order:
		 *
		 * 1. Plugins use this method to define default keystrokes.
		 * 2. Editor extends default keystrokes with {@link CKEDITOR.config#keystrokes}.
		 * 3. Editor blocks keystrokes defined in {@link CKEDITOR.config#blockedKeystrokes}.
		 *
		 * You can then set new keystrokes using this method during the runtime.
		 *
		 * @since 4.0.0
		 * @param {Number/Array} keystroke A keystroke or an array of keystroke definitions.
		 * @param {String/Boolean} [behavior] A command to be executed on the keystroke.
		 */
		setKeystroke: function() {
			var keystrokes = this.keystrokeHandler.keystrokes,
				newKeystrokes = CKEDITOR.tools.isArray( arguments[ 0 ] ) ? arguments[ 0 ] : [ [].slice.call( arguments, 0 ) ],
				keystroke, behavior;

			for ( var i = newKeystrokes.length; i--; ) {
				keystroke = newKeystrokes[ i ];
				behavior = 0;

				// It may be a pair of: [ key, command ]
				if ( CKEDITOR.tools.isArray( keystroke ) ) {
					behavior = keystroke[ 1 ];
					keystroke = keystroke[ 0 ];
				}

				if ( behavior )
					keystrokes[ keystroke ] = behavior;
				else
					delete keystrokes[ keystroke ];
			}
		},

		/**
		 * Returns the keystroke that is assigned to a specified {@link CKEDITOR.command}. If no keystroke is assigned,
		 * it returns `null`.
		 *
		 * Since version 4.7.0 this function also accepts a `command` parameter as a string.
		 *
		 * @since 4.6.0
		 * @param {CKEDITOR.command/String} command The {@link CKEDITOR.command} instance or a string with the command name.
		 * @param {Boolean} [all=false] If `true`, the function will return an array of assigned keystrokes.
		 * Available since 4.11.0.
		 * @returns {Number/Number[]/null} Depending on the `all` parameter value:
		 *
		 * * `false` &ndash; The first keystroke assigned to the provided command or `null` if there is no keystroke.
		 * * `true` &ndash; An array of all assigned keystrokes or an empty array if there is no keystroke.
		 */
		getCommandKeystroke: function( command, all ) {
			var commandInstance = ( typeof command === 'string' ? this.getCommand( command ) : command ),
				ret = [];

			if ( commandInstance ) {
				var commandName = CKEDITOR.tools.object.findKey( this.commands, commandInstance ),
					keystrokes = this.keystrokeHandler.keystrokes;

				// Some commands have a fake keystroke - for example CUT/COPY/PASTE commands are handled natively.
				// If fake key was used, the regular keystrokes should be skipped.
				if ( commandInstance.fakeKeystroke ) {
					ret.push( commandInstance.fakeKeystroke );
				} else {
					for ( var i in keystrokes ) {
						if ( keystrokes[ i ] === commandName ) {
							ret.push( i );
						}
					}
				}
			}

			return all ? ret : ( ret[ 0 ] || null );
		},

		/**
		 * Shorthand for {@link CKEDITOR.filter#addFeature}.
		 *
		 * @since 4.1.0
		 * @param {CKEDITOR.feature} feature See {@link CKEDITOR.filter#addFeature}.
		 * @returns {Boolean} See {@link CKEDITOR.filter#addFeature}.
		 */
		addFeature: function( feature ) {
			return this.filter.addFeature( feature );
		},

		/**
		 * Sets the active filter ({@link #activeFilter}). Fires the {@link #activeFilterChange} event.
		 *
		 *		// Set active filter which allows only 4 elements.
		 *		// Buttons like Bold, Italic will be disabled.
		 *		var filter = new CKEDITOR.filter( 'p strong em br' );
		 *		editor.setActiveFilter( filter );
		 *
		 * Setting a new filter will also change the {@link #setActiveEnterMode active Enter modes} to the first values
		 * allowed by the new filter (see {@link CKEDITOR.filter#getAllowedEnterMode}).
		 *
		 * @since 4.3.0
		 * @param {CKEDITOR.filter} filter Filter instance or a falsy value (e.g. `null`) to reset to the default one.
		 */
		setActiveFilter: function( filter ) {
			if ( !filter )
				filter = this.filter;

			if ( this.activeFilter !== filter ) {
				this.activeFilter = filter;
				this.fire( 'activeFilterChange' );

				// Reset active filter to the main one - it resets enter modes, too.
				if ( filter === this.filter )
					this.setActiveEnterMode( null, null );
				else
					this.setActiveEnterMode(
						filter.getAllowedEnterMode( this.enterMode ),
						filter.getAllowedEnterMode( this.shiftEnterMode, true )
					);
			}
		},

		/**
		 * Sets the active Enter modes: ({@link #enterMode} and {@link #shiftEnterMode}).
		 * Fires the {@link #activeEnterModeChange} event.
		 *
		 * Prior to CKEditor 4.3.0 Enter modes were static and it was enough to check {@link CKEDITOR.config#enterMode}
		 * and {@link CKEDITOR.config#shiftEnterMode} when implementing a feature which should depend on the Enter modes.
		 * Since CKEditor 4.3.0 these options are source of initial:
		 *
		 * * static {@link #enterMode} and {@link #shiftEnterMode} values,
		 * * dynamic {@link #activeEnterMode} and {@link #activeShiftEnterMode} values.
		 *
		 * However, the dynamic Enter modes can be changed during runtime by using this method, to reflect the selection context.
		 * For example, if selection is moved to the {@link CKEDITOR.plugins.widget widget}'s nested editable which
		 * is a {@link #blockless blockless one}, then the active Enter modes should be changed to {@link CKEDITOR#ENTER_BR}
		 * (in this case {@glink guide/dev_widgets Widget System} takes care of that).
		 *
		 * **Note:** This method should not be used to configure the editor &ndash; use {@link CKEDITOR.config#enterMode} and
		 * {@link CKEDITOR.config#shiftEnterMode} instead. This method should only be used to dynamically change
		 * Enter modes during runtime based on selection changes.
		 * Keep in mind that changed Enter mode may be overwritten by another plugin/feature when it decided that
		 * the changed context requires this.
		 *
		 * **Note:** In case of blockless editor (inline editor based on an element which cannot contain block elements
		 * &mdash; see {@link CKEDITOR.editor#blockless}) only {@link CKEDITOR#ENTER_BR} is a valid Enter mode. Therefore
		 * this method will not allow to set other values.
		 *
		 * **Note:** Changing the {@link #activeFilter active filter} may cause the Enter mode to change if default Enter modes
		 * are not allowed by the new filter.
		 *
		 * @since 4.3.0
		 * @param {Number} enterMode One of {@link CKEDITOR#ENTER_P}, {@link CKEDITOR#ENTER_DIV}, {@link CKEDITOR#ENTER_BR}.
		 * Pass falsy value (e.g. `null`) to reset the Enter mode to the default value ({@link #enterMode} and/or {@link #shiftEnterMode}).
		 * @param {Number} shiftEnterMode See the `enterMode` argument.
		 */
		setActiveEnterMode: function( enterMode, shiftEnterMode ) {
			// Validate passed modes or use default ones (validated on init).
			enterMode = enterMode ? validateEnterMode( this, enterMode ) : this.enterMode;
			shiftEnterMode = shiftEnterMode ? validateEnterMode( this, shiftEnterMode ) : this.shiftEnterMode;

			if ( this.activeEnterMode != enterMode || this.activeShiftEnterMode != shiftEnterMode ) {
				this.activeEnterMode = enterMode;
				this.activeShiftEnterMode = shiftEnterMode;
				this.fire( 'activeEnterModeChange' );
			}
		},

		/**
		 * Shows a notification to the user.
		 *
		 * If the [Notification](https://ckeditor.com/cke4/addon/notification) plugin is not enabled, this function shows
		 * a normal alert with the given `message`. The `type` and `progressOrDuration` parameters are supported
		 * only by the Notification plugin.
		 *
		 * If the Notification plugin is enabled, this method creates and shows a new notification.
		 * By default the notification is shown over the editor content, in the viewport if it is possible.
		 *
		 * See {@link CKEDITOR.plugins.notification}.
		 *
		 * @since 4.5.0
		 * @member CKEDITOR.editor
		 * @param {String} message The message displayed in the notification.
		 * @param {String} [type='info'] The type of the notification. Can be `'info'`, `'warning'`, `'success'` or `'progress'`.
		 * @param {Number} [progressOrDuration] If the type is `progress`, the third parameter may be a progress from `0` to `1`
		 * (defaults to `0`). Otherwise the third parameter may be a notification duration denoting after how many milliseconds
		 * the notification should be closed automatically. `0` means that the notification will not close automatically and the user
		 * needs to close it manually. See {@link CKEDITOR.plugins.notification#duration}.
		 * Note that `warning` notifications will not be closed automatically.
		 * @returns {CKEDITOR.plugins.notification} Created and shown notification.
		 */
		showNotification: function( message ) {
			alert( message ); // jshint ignore:line
		}
	} );

	/**
	 * Gets the element from the DOM and checks if the editor can be instantiated on it.
	 * This function is available for internal use only.
	 *
	 * @private
	 * @since 4.12.0
	 * @static
	 * @param {String/CKEDITOR.dom.element} elementOrId
	 * @member CKEDITOR.editor
	 * @returns {CKEDITOR.dom.element/null}
	 */
	CKEDITOR.editor._getEditorElement = function( elementOrId ) {
		if ( !CKEDITOR.env.isCompatible ) {
			return null;
		}

		var element = CKEDITOR.dom.element.get( elementOrId );

		// Throw error on missing target element.
		if ( !element ) {
			CKEDITOR.error( 'editor-incorrect-element', {
				element: elementOrId
			} );

			return null;
		}

		// Avoid multiple inline editor instances on the same element.
		if ( element.getEditor() ) {
			CKEDITOR.error( 'editor-element-conflict', {
				editorName: element.getEditor().name
			} );

			return null;
		}

		return element;
	};
} )();

/**
 * The editor has no associated element.
 *
 * @readonly
 * @property {Number} [=0]
 * @member CKEDITOR
 */
CKEDITOR.ELEMENT_MODE_NONE = 0;

/**
 * The element is to be replaced by the editor instance.
 *
 * @readonly
 * @property {Number} [=1]
 * @member CKEDITOR
 */
CKEDITOR.ELEMENT_MODE_REPLACE = 1;

/**
 * The editor is to be created inside the element.
 *
 * @readonly
 * @property {Number} [=2]
 * @member CKEDITOR
 */
CKEDITOR.ELEMENT_MODE_APPENDTO = 2;

/**
 * The editor is to be attached to the element, using it as the editing block.
 *
 * @readonly
 * @property {Number} [=3]
 * @member CKEDITOR
 */
CKEDITOR.ELEMENT_MODE_INLINE = 3;

/**
 * Whether to escape HTML when the editor updates the original input element.
 *
 *		config.htmlEncodeOutput = true;
 *
 * @since 3.1.0
 * @cfg {Boolean} [htmlEncodeOutput=false]
 * @member CKEDITOR.config
 */

/**
 * If `true`, makes the editor start in read-only state. Otherwise, it will check
 * if the linked `<textarea>` element has the `disabled` attribute.
 *
 * Read more in the {@glink features/readonly documentation}
 * and see the {@glink examples/readonly example}.
 *
 *		config.readOnly = true;
 *
 * @since 3.6.0
 * @cfg {Boolean} [readOnly=false]
 * @member CKEDITOR.config
 * @see CKEDITOR.editor#setReadOnly
 */

/**
 * Whether an editable element should have focus when the editor is loading for the first time.
 *
 *		// Focus at the beginning of the editable.
 *		config.startupFocus = true;
 *
 * Since CKEditor 4.9.0, `startupFocus` can be explicitly set to either the `start` or the `end`
 * of the editable:
 *
 *		// Focus at the beginning of the editable.
 *		config.startupFocus = 'start';
 *
 *		// Focus at the end of the editable.
 *		config.startupFocus = 'end';
 *
 * @cfg {String/Boolean} [startupFocus=false]
 * @member CKEDITOR.config
 */

/**
 * Customizes the {@link CKEDITOR.editor#title human-readable title} of this editor. This title is displayed in
 * tooltips and impacts various [accessibility aspects](#!/guide/dev_a11y-section-announcing-the-editor-on-the-page),
 * e.g. it is commonly used by screen readers for distinguishing editor instances and for navigation.
 * Accepted values are a string or `false`.
 *
 * **Note:** When `config.title` is set globally, the same value will be applied to all editor instances
 * loaded with this config. This may adversely affect accessibility as screen reader users will be unable
 * to distinguish particular editor instances and navigate between them.
 *
 * **Note:** Setting `config.title = false` may also impair accessibility in a similar way.
 *
 * **Note:** Please do not confuse this property with {@link CKEDITOR.editor#name}
 * which identifies the instance in the {@link CKEDITOR#instances} literal.
 *
 *		// Sets the title to 'My WYSIWYG editor.'. The original title of the element (if it exists)
 *		// will be restored once the editor instance is destroyed.
 *		config.title = 'My WYSIWYG editor.';
 *
 *		// Do not touch the title. If the element already has a title, it remains unchanged.
 *		// Also if no `title` attribute exists, nothing new will be added.
 *		config.title = false;
 *
 * See also:
 *
 * * CKEDITOR.editor#name
 * * CKEDITOR.editor#title
 *
 * @since 4.2.0
 * @cfg {String/Boolean} [title=based on editor.name]
 * @member CKEDITOR.config
 */

/**
 * Sets listeners on editor events.
 *
 * **Note:** This property can only be set in the `config` object passed directly
 * to {@link CKEDITOR#replace}, {@link CKEDITOR#inline}, and other creators.
 *
 *		CKEDITOR.replace( 'editor1', {
 *			on: {
 *				instanceReady: function() {
 *					alert( this.name ); // 'editor1'
 *				},
 *
 *				key: function() {
 *					// ...
 *				}
 *			}
 *		} );
 *
 * @cfg {Object} on
 * @member CKEDITOR.config
 */

/**
 * The outermost element in the DOM tree in which the editable element resides. It is provided
 * by a specific editor creator after the editor UI is created and is not intended to
 * be modified.
 *
 *		var editor = CKEDITOR.instances.editor1;
 *		alert( editor.container.getName() ); // 'span'
 *
 * @readonly
 * @property {CKEDITOR.dom.element} container
 */

/**
 * The document that stores the editor content.
 *
 * * For the classic (`iframe`-based) editor it is equal to the document inside the
 * `iframe` containing the editable element.
 * * For the inline editor it is equal to {@link CKEDITOR#document}.
 *
 * The document object is available after the {@link #contentDom} event is fired
 * and may be invalidated when the {@link #contentDomUnload} event is fired
 * (classic editor only).
 *
 *		editor.on( 'contentDom', function() {
 *			console.log( editor.document );
 *		} );
 *
 * @readonly
 * @property {CKEDITOR.dom.document} document
 */

/**
 * The window instance related to the {@link #document} property.
 *
 * It is always equal to the `editor.document.getWindow()`.
 *
 * See the {@link #document} property documentation.
 *
 * @readonly
 * @property {CKEDITOR.dom.window} window
 */

/**
 * The main filter instance used for input data filtering, data
 * transformations, and activation of features.
 *
 * It points to a {@link CKEDITOR.filter} instance set up based on
 * editor configuration.
 *
 * @since 4.1.0
 * @readonly
 * @property {CKEDITOR.filter} filter
 */

/**
 * The active filter instance which should be used in the current context (location selection).
 * This instance will be used to make a decision which commands, buttons and other
 * {@link CKEDITOR.feature features} can be enabled.
 *
 * By default it equals the {@link #filter} and it can be changed by the {@link #setActiveFilter} method.
 *
 *		editor.on( 'activeFilterChange', function() {
 *			if ( editor.activeFilter.check( 'cite' ) )
 *				// Do something when <cite> was enabled - e.g. enable a button.
 *			else
 *				// Otherwise do something else.
 *		} );
 *
 * See also the {@link #setActiveEnterMode} method for an explanation of dynamic settings.
 *
 * @since 4.3.0
 * @readonly
 * @property {CKEDITOR.filter} activeFilter
 */

/**
 * The main (static) Enter mode which is a validated version of the {@link CKEDITOR.config#enterMode} setting.
 * Currently only one rule exists &mdash; {@link #blockless blockless editors} may have
 * Enter modes set only to {@link CKEDITOR#ENTER_BR}.
 *
 * @since 4.3.0
 * @readonly
 * @property {Number} enterMode
 */

/**
 * See the {@link #enterMode} property.
 *
 * @since 4.3.0
 * @readonly
 * @property {Number} shiftEnterMode
 */

/**
 * The dynamic Enter mode which should be used in the current context (selection location).
 * By default it equals the {@link #enterMode} and it can be changed by the {@link #setActiveEnterMode} method.
 *
 * See also the {@link #setActiveEnterMode} method for an explanation of dynamic settings.
 *
 * @since 4.3.0
 * @readonly
 * @property {Number} activeEnterMode
 */

/**
 * See the {@link #activeEnterMode} property.
 *
 * @since 4.3.0
 * @readonly
 * @property {Number} activeShiftEnterMode
 */

/**
 * Event fired by the {@link #setActiveFilter} method when the {@link #activeFilter} is changed.
 *
 * @since 4.3.0
 * @event activeFilterChange
 */

/**
 * Event fired by the {@link #setActiveEnterMode} method when any of the active Enter modes is changed.
 * See also the {@link #activeEnterMode} and {@link #activeShiftEnterMode} properties.
 *
 * @since 4.3.0
 * @event activeEnterModeChange
 */

/**
 * Event fired when a CKEDITOR instance is created, but still before initializing it.
 * To interact with a fully initialized instance, use the
 * {@link CKEDITOR#instanceReady} event instead.
 *
 * @event instanceCreated
 * @member CKEDITOR
 * @param {CKEDITOR.editor} editor The editor instance that has been created.
 */

/**
 * Event fired when CKEDITOR instance's components (configuration, languages and plugins) are fully
 * loaded and initialized. However, the editor will be fully ready for interaction
 * on {@link CKEDITOR#instanceReady}.
 *
 * @event instanceLoaded
 * @member CKEDITOR
 * @param {CKEDITOR.editor} editor This editor instance that has been loaded.
 */

/**
 * Event fired when a CKEDITOR instance is destroyed.
 *
 * @event instanceDestroyed
 * @member CKEDITOR
 * @param {CKEDITOR.editor} editor The editor instance that has been destroyed.
 */

/**
 * Event fired when a CKEDITOR instance is created, fully initialized and ready for interaction.
 *
 * @event instanceReady
 * @member CKEDITOR
 * @param {CKEDITOR.editor} editor The editor instance that has been created.
 */

/**
 * Event fired when the language is loaded into the editor instance.
 *
 * @since 3.6.1
 * @event langLoaded
 * @param {CKEDITOR.editor} editor This editor instance.
 */

/**
 * Event fired when all plugins are loaded and initialized into the editor instance.
 *
 * @event pluginsLoaded
 * @param {CKEDITOR.editor} editor This editor instance.
 */

/**
 * Event fired when the styles set is loaded. During the editor initialization
 * phase the {@link #getStylesSet} method returns only styles that
 * are already loaded, which may not include e.g. styles parsed
 * by the `stylesheetparser` plugin. Thus, to be notified when all
 * styles are ready, you can listen on this event.
 *
 * @since 4.1.0
 * @event stylesSet
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param {Array} styles An array of styles definitions.
 */

/**
 * Event fired before the command execution when {@link #execCommand} is called.
 *
 * @event beforeCommandExec
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param data
 * @param {String} data.name The command name.
 * @param {Object} data.commandData The data to be sent to the command. This
 * can be manipulated by the event listener.
 * @param {CKEDITOR.command} data.command The command itself.
 */

/**
 * Event fired after the command execution when {@link #execCommand} is called.
 *
 * @event afterCommandExec
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param data
 * @param {String} data.name The command name.
 * @param {Object} data.commandData The data sent to the command.
 * @param {CKEDITOR.command} data.command The command itself.
 * @param {Object} data.returnValue The value returned by the command execution.
 */

/**
 * Event fired when a custom configuration file is loaded, before the final
 * configuration initialization.
 *
 * Custom configuration files can be loaded thorugh the
 * {@link CKEDITOR.config#customConfig} setting. Several files can be loaded
 * by changing this setting.
 *
 * @event customConfigLoaded
 * @param {CKEDITOR.editor} editor This editor instance.
 */

/**
 * Event fired once the editor configuration is ready (loaded and processed).
 *
 * @event configLoaded
 * @param {CKEDITOR.editor} editor This editor instance.
 */

/**
 * Event fired when this editor instance is destroyed. The editor at this
 * point is not usable and this event should be used to perform the clean-up
 * in any plugin.
 *
 * @event destroy
 * @param {CKEDITOR.editor} editor This editor instance.
 */

/**
 * Event fired when the {@link #method-destroy} method is called,
 * but before destroying the editor.
 *
 * @event beforeDestroy
 * @param {CKEDITOR.editor} editor This editor instance.
 */

/**
 * Internal event to get the current data.
 *
 * @event beforeGetData
 * @param {CKEDITOR.editor} editor This editor instance.
 */

/**
 * Internal event to perform the {@link #method-getSnapshot} call.
 *
 * @event getSnapshot
 * @param {CKEDITOR.editor} editor This editor instance.
 */

/**
 * Internal event to perform the {@link #method-loadSnapshot} call.
 *
 * @event loadSnapshot
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param {String} data The data that will be used.
 */

/**
 * Event fired before the {@link #method-getData} call returns, allowing for additional manipulation.
 *
 * @event getData
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param data
 * @param {String} data.dataValue The data that will be returned.
 */

/**
 * Event fired before the {@link #method-setData} call is executed, allowing for additional manipulation.
 *
 * @event setData
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param data
 * @param {String} data.dataValue The data that will be used.
 */

/**
 * Event fired at the end of the {@link #method-setData} call execution. Usually it is better to use the
 * {@link #dataReady} event.
 *
 * @event afterSetData
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param data
 * @param {String} data.dataValue The data that has been set.
 */

/**
 * Event fired as an indicator of the editor data loading. It may be the result of
 * calling {@link #method-setData} explicitly or an internal
 * editor function, like the editor editing mode switching (move to Source and back).
 *
 * @event dataReady
 * @param {CKEDITOR.editor} editor This editor instance.
 */

/**
 * Event fired when the CKEDITOR instance is completely created, fully initialized
 * and ready for interaction.
 *
 * @event instanceReady
 * @param {CKEDITOR.editor} editor This editor instance.
 */

/**
 * Event fired when editor components (configuration, languages and plugins) are fully
 * loaded and initialized. However, the editor will be fully ready to for interaction
 * on {@link #instanceReady}.
 *
 * @event loaded
 * @param {CKEDITOR.editor} editor This editor instance.
 */

/**
 * Event fired by the {@link #method-insertHtml} method. See the method documentation for more information
 * about how this event can be used.
 *
 * @event insertHtml
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param data
 * @param {String} data.mode The mode in which the data is inserted (see {@link #method-insertHtml}).
 * @param {String} data.dataValue The HTML code to insert.
 * @param {CKEDITOR.dom.range} [data.range] See {@link #method-insertHtml}'s `range` parameter.
 */

/**
 * Event fired by the {@link #method-insertText} method. See the method documentation for more information
 * about how this event can be used.
 *
 * @event insertText
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param {String} data The text to insert.
 */

/**
 * Event fired by the {@link #method-insertElement} method. See the method documentation for more information
 * about how this event can be used.
 *
 * @event insertElement
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param {CKEDITOR.dom.element} data The element to insert.
 */

/**
 * Event fired after data insertion using the {@link #method-insertHtml}, {@link CKEDITOR.editable#insertHtml},
 * or {@link CKEDITOR.editable#insertHtmlIntoRange} methods.
 *
 * @since 4.5.0
 * @event afterInsertHtml
 * @param data
 * @param {CKEDITOR.dom.range} [data.intoRange] If set, the HTML was not inserted into the current selection, but into
 * the specified range. This property is set if the {@link CKEDITOR.editable#insertHtmlIntoRange} method was used,
 * but not if for the {@link CKEDITOR.editable#insertHtml} method.
 */

/**
 * Event fired after the {@link #property-readOnly} property changes.
 *
 * @since 3.6.0
 * @event readOnly
 * @param {CKEDITOR.editor} editor This editor instance.
 */

/**
 * Event fired when a UI template is added to the editor instance. It makes
 * it possible to bring customizations to the template source.
 *
 * @event template
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param data
 * @param {String} data.name The template name.
 * @param {String} data.source The source data for this template.
 */

/**
 * Event fired when the editor content (its DOM structure) is ready.
 * It is similar to the native `DOMContentLoaded` event, but it applies to
 * the editor content. It is also the first event fired after
 * the {@link CKEDITOR.editable} is initialized.
 *
 * This event is particularly important for classic (`iframe`-based)
 * editor, because on editor initialization and every time the data are set
 * (by {@link CKEDITOR.editor#method-setData}) content DOM structure
 * is rebuilt. Thus, e.g. you need to attach DOM event listeners
 * on editable one more time.
 *
 * For inline editor this event is fired only once &mdash; when the
 * editor is initialized for the first time. This is because setting
 * editor content does not cause editable destruction and creation.
 *
 * The {@link #contentDom} event goes along with {@link #contentDomUnload}
 * which is fired before the content DOM structure is destroyed. This is the
 * right moment to detach content DOM event listener. Otherwise
 * browsers like IE or Opera may throw exceptions when accessing
 * elements from the detached document.
 *
 * **Note:** {@link CKEDITOR.editable#attachListener} is a convenient
 * way to attach listeners that will be detached on {@link #contentDomUnload}.
 *
 *		editor.on( 'contentDom', function() {
 *			var editable = editor.editable();
 *
 *			editable.attachListener( editable, 'click', function() {
 *				console.log( 'The editable was clicked.' );
 *			});
 *		});
 *
 * @event contentDom
 * @param {CKEDITOR.editor} editor This editor instance.
 */

/**
 * Event fired before the content DOM structure is destroyed.
 * See {@link #contentDom} documentation for more details.
 *
 * @event contentDomUnload
 * @param {CKEDITOR.editor} editor This editor instance.
 */

/**
 * Event fired when the content DOM changes and some of the references as well as
 * the native DOM event listeners could be lost.
 * This event is useful when it is important to keep track of references
 * to elements in the editable content from code.
 *
 * @since 4.3.0
 * @event contentDomInvalidated
 * @param {CKEDITOR.editor} editor This editor instance.
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * Provides an "event like" system to parse strings of HTML data.
 *
 *		var parser = new CKEDITOR.htmlParser();
 *		parser.onTagOpen = function( tagName, attributes, selfClosing ) {
 *			alert( tagName );
 *		};
 *		parser.parse( '<p>Some <b>text</b>.</p>' ); // Alerts 'p', 'b'.
 *
 * @class
 * @constructor Creates a htmlParser class instance.
 */
CKEDITOR.htmlParser = function() {
	this._ = {
		htmlPartsRegex: /<(?:(?:\/([^>]+)>)|(?:!--([\S|\s]*?)-->)|(?:([^\/\s>]+)((?:\s+[\w\-:.]+(?:\s*=\s*?(?:(?:"[^"]*")|(?:'[^']*')|[^\s"'\/>]+))?)*)[\S\s]*?(\/?)>))/g
	};
};

( function() {
	var attribsRegex = /([\w\-:.]+)(?:(?:\s*=\s*(?:(?:"([^"]*)")|(?:'([^']*)')|([^\s>]+)))|(?=\s|$))/g,
		emptyAttribs = { checked: 1, compact: 1, declare: 1, defer: 1, disabled: 1, ismap: 1, multiple: 1, nohref: 1, noresize: 1, noshade: 1, nowrap: 1, readonly: 1, selected: 1 };

	CKEDITOR.htmlParser.prototype = {
		/**
		 * Function to be fired when a tag opener is found. This function
		 * should be overriden when using this class.
		 *
		 *		var parser = new CKEDITOR.htmlParser();
		 *		parser.onTagOpen = function( tagName, attributes, selfClosing ) {
		 *			alert( tagName ); // e.g. 'b'
		 *		} );
		 *		parser.parse( '<!-- Example --><b>Hello</b>' );
		 *
		 * @param {String} tagName The tag name. The name is guarantted to be lowercased.
		 * @param {Object} attributes An object containing all tag attributes. Each
		 * property in this object represent and attribute name and its value is the attribute value.
		 * @param {Boolean} selfClosing `true` if the tag closes itself, false if the tag doesn't.
		 */
		onTagOpen: function() {},

		/**
		 * Function to be fired when a tag closer is found. This function
		 * should be overriden when using this class.
		 *
		 *		var parser = new CKEDITOR.htmlParser();
		 *		parser.onTagClose = function( tagName ) {
		 *			alert( tagName ); // 'b'
		 *		} );
		 *		parser.parse( '<!-- Example --><b>Hello</b>' );
		 *
		 * @param {String} tagName The tag name. The name is guarantted to be lowercased.
		 */
		onTagClose: function() {},

		/**
		 * Function to be fired when text is found. This function
		 * should be overriden when using this class.
		 *
		 *		var parser = new CKEDITOR.htmlParser();
		 *		parser.onText = function( text ) {
		 *			alert( text ); // 'Hello'
		 *		} );
		 *		parser.parse( '<!-- Example --><b>Hello</b>' );
		 *
		 * @param {String} text The text found.
		 */
		onText: function() {},

		/**
		 * Function to be fired when CDATA section is found. This function
		 * should be overriden when using this class.
		 *
		 *		var parser = new CKEDITOR.htmlParser();
		 *		parser.onCDATA = function( cdata ) {
		 *			alert( cdata ); // 'var hello;'
		 *		} );
		 *		parser.parse( '<script>var hello;</script>' );
		 *
		 * @param {String} cdata The CDATA been found.
		 */
		onCDATA: function() {},

		/**
		 * Function to be fired when a commend is found. This function
		 * should be overriden when using this class.
		 *
		 *		var parser = new CKEDITOR.htmlParser();
		 *		parser.onComment = function( comment ) {
		 *			alert( comment ); // ' Example '
		 *		} );
		 *		parser.parse( '<!-- Example --><b>Hello</b>' );
		 *
		 * @param {String} comment The comment text.
		 */
		onComment: function() {},

		/**
		 * Parses text, looking for HTML tokens, like tag openers or closers,
		 * or comments. This function fires the onTagOpen, onTagClose, onText
		 * and onComment function during its execution.
		 *
		 *		var parser = new CKEDITOR.htmlParser();
		 *		// The onTagOpen, onTagClose, onText and onComment should be overriden
		 *		// at this point.
		 *		parser.parse( '<!-- Example --><b>Hello</b>' );
		 *
		 * @param {String} html The HTML to be parsed.
		 */
		parse: function( html ) {
			var parts, tagName,
				nextIndex = 0,
				cdata; // The collected data inside a CDATA section.

			while ( ( parts = this._.htmlPartsRegex.exec( html ) ) ) {
				var tagIndex = parts.index;
				if ( tagIndex > nextIndex ) {
					var text = html.substring( nextIndex, tagIndex );

					if ( cdata )
						cdata.push( text );
					else
						this.onText( text );
				}

				nextIndex = this._.htmlPartsRegex.lastIndex;

				// "parts" is an array with the following items:
				//		0 : The entire match for opening/closing tags and comments.
				//		  : Group filled with the tag name for closing tags.
				//		2 : Group filled with the comment text.
				//		3 : Group filled with the tag name for opening tags.
				//		4 : Group filled with the attributes part of opening tags.

				// Closing tag
				if ( ( tagName = parts[ 1 ] ) ) {
					tagName = tagName.toLowerCase();

					if ( cdata && CKEDITOR.dtd.$cdata[ tagName ] ) {
						// Send the CDATA data.
						this.onCDATA( cdata.join( '' ) );
						cdata = null;
					}

					if ( !cdata ) {
						this.onTagClose( tagName );
						continue;
					}
				}

				// If CDATA is enabled, just save the raw match.
				if ( cdata ) {
					cdata.push( parts[ 0 ] );
					continue;
				}

				// Opening tag
				if ( ( tagName = parts[ 3 ] ) ) {
					tagName = tagName.toLowerCase();

					// There are some tag names that can break things, so let's
					// simply ignore them when parsing. (https://dev.ckeditor.com/ticket/5224)
					if ( /="/.test( tagName ) )
						continue;

					var attribs = {},
						attribMatch,
						attribsPart = parts[ 4 ],
						selfClosing = !!parts[ 5 ];

					if ( attribsPart ) {
						while ( ( attribMatch = attribsRegex.exec( attribsPart ) ) ) {
							var attName = attribMatch[ 1 ].toLowerCase(),
								attValue = attribMatch[ 2 ] || attribMatch[ 3 ] || attribMatch[ 4 ] || '';

							if ( !attValue && emptyAttribs[ attName ] )
								attribs[ attName ] = attName;
							else
								attribs[ attName ] = CKEDITOR.tools.htmlDecodeAttr( attValue );
						}
					}

					this.onTagOpen( tagName, attribs, selfClosing );

					// Open CDATA mode when finding the appropriate tags.
					if ( !cdata && CKEDITOR.dtd.$cdata[ tagName ] )
						cdata = [];

					continue;
				}

				// Comment
				if ( ( tagName = parts[ 2 ] ) )
					this.onComment( tagName );
			}

			if ( html.length > nextIndex )
				this.onText( html.substring( nextIndex, html.length ) );
		}
	};
} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * TODO
 *
 * @class
 * @todo
 */
CKEDITOR.htmlParser.basicWriter = CKEDITOR.tools.createClass( {
	/**
	 * Creates a basicWriter class instance.
	 *
	 * @constructor
	 */
	$: function() {
		this._ = {
			output: []
		};
	},

	proto: {
		/**
		 * Writes the tag opening part for a opener tag.
		 *
		 *		// Writes '<p'.
		 *		writer.openTag( 'p', { class : 'MyClass', id : 'MyId' } );
		 *
		 * @param {String} tagName The element name for this tag.
		 * @param {Object} attributes The attributes defined for this tag. The
		 * attributes could be used to inspect the tag.
		 */
		openTag: function( tagName ) {
			this._.output.push( '<', tagName );
		},

		/**
		 * Writes the tag closing part for a opener tag.
		 *
		 *		// Writes '>'.
		 *		writer.openTagClose( 'p', false );
		 *
		 *		// Writes ' />'.
		 *		writer.openTagClose( 'br', true );
		 *
		 * @param {String} tagName The element name for this tag.
		 * @param {Boolean} isSelfClose Indicates that this is a self-closing tag,
		 * like `<br>` or `<img>`.
		 */
		openTagClose: function( tagName, isSelfClose ) {
			if ( isSelfClose )
				this._.output.push( ' />' );
			else
				this._.output.push( '>' );
		},

		/**
		 * Writes an attribute. This function should be called after opening the
		 * tag with {@link #openTagClose}.
		 *
		 *		// Writes ' class="MyClass"'.
		 *		writer.attribute( 'class', 'MyClass' );
		 *
		 * @param {String} attName The attribute name.
		 * @param {String} attValue The attribute value.
		 */
		attribute: function( attName, attValue ) {
			// Browsers don't always escape special character in attribute values. (https://dev.ckeditor.com/ticket/4683, https://dev.ckeditor.com/ticket/4719).
			if ( typeof attValue == 'string' )
				attValue = CKEDITOR.tools.htmlEncodeAttr( attValue );

			this._.output.push( ' ', attName, '="', attValue, '"' );
		},

		/**
		 * Writes a closer tag.
		 *
		 *		// Writes '</p>'.
		 *		writer.closeTag( 'p' );
		 *
		 * @param {String} tagName The element name for this tag.
		 */
		closeTag: function( tagName ) {
			this._.output.push( '</', tagName, '>' );
		},

		/**
		 * Writes text.
		 *
		 *		// Writes 'Hello Word'.
		 *		writer.text( 'Hello Word' );
		 *
		 * @param {String} text The text value.
		 */
		text: function( text ) {
			this._.output.push( text );
		},

		/**
		 * Writes a comment.
		 *
		 *		// Writes '<!-- My comment -->'.
		 *		writer.comment( ' My comment ' );
		 *
		 * @param {String} comment The comment text.
		 */
		comment: function( comment ) {
			this._.output.push( '<!--', comment, '-->' );
		},

		/**
		 * Writes any kind of data to the ouput.
		 *
		 *		writer.write( 'This is an <b>example</b>.' );
		 *
		 * @param {String} data
		 */
		write: function( data ) {
			this._.output.push( data );
		},

		/**
		 * Empties the current output buffer.
		 *
		 *		writer.reset();
		 */
		reset: function() {
			this._.output = [];
			this._.indent = false;
		},

		/**
		 * Empties the current output buffer.
		 *
		 *		var html = writer.getHtml();
		 *
		 * @param {Boolean} reset Indicates that the {@link #reset} method is to
		 * be automatically called after retrieving the HTML.
		 * @returns {String} The HTML written to the writer so far.
		 */
		getHtml: function( reset ) {
			var html = this._.output.join( '' );

			if ( reset )
				this.reset();

			return html;
		}
	}
} );

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

'use strict';

( function() {
	/**
	 * A lightweight representation of HTML node.
	 *
	 * @since 4.1.0
	 * @class
	 * @constructor Creates a node class instance.
	 */
	CKEDITOR.htmlParser.node = function() {};

	CKEDITOR.htmlParser.node.prototype = {
		/**
		 * Remove this node from a tree.
		 *
		 * @since 4.1.0
		 */
		remove: function() {
			var children = this.parent.children,
				index = CKEDITOR.tools.indexOf( children, this ),
				previous = this.previous,
				next = this.next;

			previous && ( previous.next = next );
			next && ( next.previous = previous );
			children.splice( index, 1 );
			this.parent = null;
		},

		/**
		 * Replace this node with given one.
		 *
		 * @since 4.1.0
		 * @param {CKEDITOR.htmlParser.node} node The node that will replace this one.
		 */
		replaceWith: function( node ) {
			var children = this.parent.children,
				index = CKEDITOR.tools.indexOf( children, this ),
				previous = node.previous = this.previous,
				next = node.next = this.next;

			previous && ( previous.next = node );
			next && ( next.previous = node );

			children[ index ] = node;

			node.parent = this.parent;
			this.parent = null;
		},

		/**
		 * Insert this node after given one.
		 *
		 * @since 4.1.0
		 * @param {CKEDITOR.htmlParser.node} node The node that will precede this element.
		 */
		insertAfter: function( node ) {
			var children = node.parent.children,
				index = CKEDITOR.tools.indexOf( children, node ),
				next = node.next;

			children.splice( index + 1, 0, this );

			this.next = node.next;
			this.previous = node;
			node.next = this;
			next && ( next.previous = this );

			this.parent = node.parent;
		},

		/**
		 * Insert this node before given one.
		 *
		 * @since 4.1.0
		 * @param {CKEDITOR.htmlParser.node} node The node that will follow this element.
		 */
		insertBefore: function( node ) {
			var children = node.parent.children,
				index = CKEDITOR.tools.indexOf( children, node );

			children.splice( index, 0, this );

			this.next = node;
			this.previous = node.previous;
			node.previous && ( node.previous.next = this );
			node.previous = this;

			this.parent = node.parent;
		},

		/**
		 * Gets the closest ancestor element of this element which satisfies given condition
		 *
		 * @since 4.3.0
		 * @param {String/Object/Function} condition Name of an ancestor, hash of names or validator function.
		 * @returns {CKEDITOR.htmlParser.element} The closest ancestor which satisfies given condition or `null`.
		 */
		getAscendant: function( condition ) {
			var checkFn =
				typeof condition == 'function' ?
					condition :
				typeof condition == 'string' ?
					function( el ) {
						return el.name == condition;
					} :
					function( el ) {
						return el.name in condition;
					};

			var parent = this.parent;

			// Parent has to be an element - don't check doc fragment.
			while ( parent && parent.type == CKEDITOR.NODE_ELEMENT ) {
				if ( checkFn( parent ) )
					return parent;
				parent = parent.parent;
			}

			return null;
		},

		/**
		 * Wraps this element with given `wrapper`.
		 *
		 * @since 4.3.0
		 * @param {CKEDITOR.htmlParser.element} wrapper The element which will be this element's new parent.
		 * @returns {CKEDITOR.htmlParser.element} Wrapper.
		 */
		wrapWith: function( wrapper ) {
			this.replaceWith( wrapper );
			wrapper.add( this );
			return wrapper;
		},

		/**
		 * Gets this node's index in its parent's children array.
		 *
		 * @since 4.3.0
		 * @returns {Number}
		 */
		getIndex: function() {
			return CKEDITOR.tools.indexOf( this.parent.children, this );
		},

		getFilterContext: function( context ) {
			return context || {};
		}
	};
} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

'use strict';

/**
 * A lightweight representation of an HTML comment.
 *
 * @class
 * @extends CKEDITOR.htmlParser.node
 * @constructor Creates a comment class instance.
 * @param {String} value The comment text value.
 */
CKEDITOR.htmlParser.comment = function( value ) {
	/**
	 * The comment text.
	 *
	 * @property {String}
	 */
	this.value = value;

	/** @private */
	this._ = {
		isBlockLike: false
	};
};

CKEDITOR.htmlParser.comment.prototype = CKEDITOR.tools.extend( new CKEDITOR.htmlParser.node(), {
	/**
	 * The node type. This is a constant value set to {@link CKEDITOR#NODE_COMMENT}.
	 *
	 * @readonly
	 * @property {Number} [=CKEDITOR.NODE_COMMENT]
	 */
	type: CKEDITOR.NODE_COMMENT,

	/**
	 * Filter this comment with given filter.
	 *
	 * @since 4.1.0
	 * @param {CKEDITOR.htmlParser.filter} filter
	 * @returns {Boolean} Method returns `false` when this comment has
	 * been removed or replaced with other node. This is an information for
	 * {@link CKEDITOR.htmlParser.element#filterChildren} that it has
	 * to repeat filter on current position in parent's children array.
	 */
	filter: function( filter, context ) {
		var comment = this.value;

		if ( !( comment = filter.onComment( context, comment, this ) ) ) {
			this.remove();
			return false;
		}

		if ( typeof comment != 'string' ) {
			this.replaceWith( comment );
			return false;
		}

		this.value = comment;

		return true;
	},

	/**
	 * Writes the HTML representation of this comment to a CKEDITOR.htmlWriter.
	 *
	 * @param {CKEDITOR.htmlParser.basicWriter} writer The writer to which write the HTML.
	 * @param {CKEDITOR.htmlParser.filter} [filter] The filter to be applied to this node.
	 * **Note:** it's unsafe to filter offline (not appended) node.
	 */
	writeHtml: function( writer, filter ) {
		if ( filter )
			this.filter( filter );

		writer.comment( this.value );
	}
} );

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

'use strict';

( function() {
	/**
	 * A lightweight representation of HTML text.
	 *
	 * @class
	 * @extends CKEDITOR.htmlParser.node
	 * @constructor Creates a text class instance.
	 * @param {String} value The text node value.
	 */
	CKEDITOR.htmlParser.text = function( value ) {
		/**
		 * The text value.
		 *
		 * @property {String}
		 */
		this.value = value;

		/** @private */
		this._ = {
			isBlockLike: false
		};
	};

	CKEDITOR.htmlParser.text.prototype = CKEDITOR.tools.extend( new CKEDITOR.htmlParser.node(), {
		/**
		 * The node type. This is a constant value set to {@link CKEDITOR#NODE_TEXT}.
		 *
		 * @readonly
		 * @property {Number} [=CKEDITOR.NODE_TEXT]
		 */
		type: CKEDITOR.NODE_TEXT,

		/**
		 * Filter this text node with given filter.
		 *
		 * @since 4.1.0
		 * @param {CKEDITOR.htmlParser.filter} filter
		 * @returns {Boolean} Method returns `false` when this text node has
		 * been removed. This is an information for {@link CKEDITOR.htmlParser.element#filterChildren}
		 * that it has to repeat filter on current position in parent's children array.
		 */
		filter: function( filter, context ) {
			if ( !( this.value = filter.onText( context, this.value, this ) ) ) {
				this.remove();
				return false;
			}
		},

		/**
		 * Writes the HTML representation of this text to a {CKEDITOR.htmlParser.basicWriter}.
		 *
		 * @param {CKEDITOR.htmlParser.basicWriter} writer The writer to which write the HTML.
		 * @param {CKEDITOR.htmlParser.filter} [filter] The filter to be applied to this node.
		 * **Note:** it's unsafe to filter offline (not appended) node.
		 */
		writeHtml: function( writer, filter ) {
			if ( filter )
				this.filter( filter );

			writer.text( this.value );
		}
	} );
} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

'use strict';

( function() {

	/**
	 * A lightweight representation of HTML CDATA.
	 *
	 * @class
	 * @extends CKEDITOR.htmlParser.node
	 * @constructor Creates a cdata class instance.
	 * @param {String} value The CDATA section value.
	 */
	CKEDITOR.htmlParser.cdata = function( value ) {
		/**
		 * The CDATA value.
		 *
		 * @property {String}
		 */
		this.value = value;
	};

	CKEDITOR.htmlParser.cdata.prototype = CKEDITOR.tools.extend( new CKEDITOR.htmlParser.node(), {
		/**
		 * CDATA has the same type as {@link CKEDITOR.htmlParser.text} This is
		 * a constant value set to {@link CKEDITOR#NODE_TEXT}.
		 *
		 * @readonly
		 * @property {Number} [=CKEDITOR.NODE_TEXT]
		 */
		type: CKEDITOR.NODE_TEXT,

		filter: function() {},

		/**
		 * Writes the CDATA with no special manipulations.
		 *
		 * @param {CKEDITOR.htmlParser.basicWriter} writer The writer to which write the HTML.
		 */
		writeHtml: function( writer ) {
			writer.write( this.value );
		}
	} );
} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

'use strict';

/**
 * A lightweight representation of an HTML DOM structure.
 *
 * @class
 * @constructor Creates a fragment class instance.
 */
CKEDITOR.htmlParser.fragment = function() {
	/**
	 * The nodes contained in the root of this fragment.
	 *
	 *		var fragment = CKEDITOR.htmlParser.fragment.fromHtml( '<b>Sample</b> Text' );
	 *		alert( fragment.children.length ); // 2
	 */
	this.children = [];

	/**
	 * Get the fragment parent. Should always be null.
	 *
	 * @property {Object} [=null]
	 */
	this.parent = null;

	/** @private */
	this._ = {
		isBlockLike: true,
		hasInlineStarted: false
	};
};

( function() {
	// Block-level elements whose internal structure should be respected during
	// parser fixing.
	var nonBreakingBlocks = CKEDITOR.tools.extend( { table: 1, ul: 1, ol: 1, dl: 1 }, CKEDITOR.dtd.table, CKEDITOR.dtd.ul, CKEDITOR.dtd.ol, CKEDITOR.dtd.dl );

	var listBlocks = { ol: 1, ul: 1 };

	// Dtd of the fragment element, basically it accept anything except for intermediate structure, e.g. orphan <li>.
	var rootDtd = CKEDITOR.tools.extend( {}, { html: 1 }, CKEDITOR.dtd.html, CKEDITOR.dtd.body, CKEDITOR.dtd.head, { style: 1, script: 1 } );

	// Which element to create when encountered not allowed content.
	var structureFixes = {
		ul: 'li',
		ol: 'li',
		dl: 'dd',
		table: 'tbody',
		tbody: 'tr',
		thead: 'tr',
		tfoot: 'tr',
		tr: 'td'
	};

	function isRemoveEmpty( node ) {
		// Keep marked element event if it is empty.
		if ( node.attributes[ 'data-cke-survive' ] )
			return false;

		// Empty link is to be removed when empty but not anchor. (https://dev.ckeditor.com/ticket/7894)
		return node.name == 'a' && node.attributes.href || CKEDITOR.dtd.$removeEmpty[ node.name ];
	}

	/**
	 * Creates a {@link CKEDITOR.htmlParser.fragment} from an HTML string.
	 *
	 *		var fragment = CKEDITOR.htmlParser.fragment.fromHtml( '<b>Sample</b> Text' );
	 *		alert( fragment.children[ 0 ].name );		// 'b'
	 *		alert( fragment.children[ 1 ].value );	// ' Text'
	 *
	 * @static
	 * @param {String} fragmentHtml The HTML to be parsed, filling the fragment.
	 * @param {CKEDITOR.htmlParser.element/String} [parent] Optional contextual
	 * element which makes the content been parsed as the content of this element and fix
	 * to match it.
	 * If not provided, then {@link CKEDITOR.htmlParser.fragment} will be used
	 * as the parent and it will be returned.
	 * @param {String/Boolean} [fixingBlock] When `parent` is a block limit element,
	 * and the param is a string value other than `false`, it is to
	 * avoid having block-less content as the direct children of parent by wrapping
	 * the content with a block element of the specified tag, e.g.
	 * when `fixingBlock` specified as `p`, the content `<body><i>foo</i></body>`
	 * will be fixed into `<body><p><i>foo</i></p></body>`.
	 * @returns {CKEDITOR.htmlParser.fragment/CKEDITOR.htmlParser.element} The created fragment or passed `parent`.
	 */
	CKEDITOR.htmlParser.fragment.fromHtml = function( fragmentHtml, parent, fixingBlock ) {
		var parser = new CKEDITOR.htmlParser();

		var root = parent instanceof CKEDITOR.htmlParser.element ? parent : typeof parent == 'string' ? new CKEDITOR.htmlParser.element( parent ) : new CKEDITOR.htmlParser.fragment();

		var pendingInline = [],
			pendingBRs = [],
			currentNode = root,
			// Indicate we're inside a <textarea> element, spaces should be touched differently.
			inTextarea = root.name == 'textarea',
			// Indicate we're inside a <pre> element, spaces should be touched differently.
			inPre = root.name == 'pre';

		function checkPending( newTagName ) {
			var pendingBRsSent;

			if ( pendingInline.length > 0 ) {
				for ( var i = 0; i < pendingInline.length; i++ ) {
					var pendingElement = pendingInline[ i ],
						pendingName = pendingElement.name,
						pendingDtd = CKEDITOR.dtd[ pendingName ],
						currentDtd = currentNode.name && CKEDITOR.dtd[ currentNode.name ];

					if ( ( !currentDtd || currentDtd[ pendingName ] ) && ( !newTagName || !pendingDtd || pendingDtd[ newTagName ] || !CKEDITOR.dtd[ newTagName ] ) ) {
						if ( !pendingBRsSent ) {
							sendPendingBRs();
							pendingBRsSent = 1;
						}

						// Get a clone for the pending element.
						pendingElement = pendingElement.clone();

						// Add it to the current node and make it the current,
						// so the new element will be added inside of it.
						pendingElement.parent = currentNode;
						currentNode = pendingElement;

						// Remove the pending element (back the index by one
						// to properly process the next entry).
						pendingInline.splice( i, 1 );
						i--;
					} else {
						// Some element of the same type cannot be nested, flat them,
						// e.g. <a href="#">foo<a href="#">bar</a></a>. (https://dev.ckeditor.com/ticket/7894)
						if ( pendingName == currentNode.name )
							addElement( currentNode, currentNode.parent, 1 ), i--;
					}
				}
			}
		}

		function sendPendingBRs() {
			while ( pendingBRs.length )
				addElement( pendingBRs.shift(), currentNode );
		}

		// Rtrim empty spaces on block end boundary. (https://dev.ckeditor.com/ticket/3585)
		function removeTailWhitespace( element ) {
			if ( element._.isBlockLike && element.name != 'pre' && element.name != 'textarea' ) {

				var length = element.children.length,
					lastChild = element.children[ length - 1 ],
					text;
				if ( lastChild && lastChild.type == CKEDITOR.NODE_TEXT ) {
					if ( !( text = CKEDITOR.tools.rtrim( lastChild.value ) ) )
						element.children.length = length - 1;
					else
						lastChild.value = text;
				}
			}
		}

		// Beside of simply append specified element to target, this function also takes
		// care of other dirty lifts like forcing block in body, trimming spaces at
		// the block boundaries etc.
		//
		// @param {Element} element  The element to be added as the last child of {@link target}.
		// @param {Element} target The parent element to relieve the new node.
		// @param {Boolean} [moveCurrent=false] Don't change the "currentNode" global unless
		// there's a return point node specified on the element, otherwise move current onto {@link target} node.
		//
		function addElement( element, target, moveCurrent ) {
			target = target || currentNode || root;

			// Current element might be mangled by fix body below,
			// save it for restore later.
			var savedCurrent = currentNode;

			// Ignore any element that has already been added.
			if ( element.previous === undefined ) {
				if ( checkAutoParagraphing( target, element ) ) {
					// Create a <p> in the fragment.
					currentNode = target;
					parser.onTagOpen( fixingBlock, {} );

					// The new target now is the <p>.
					element.returnPoint = target = currentNode;
				}

				removeTailWhitespace( element );

				// Avoid adding empty inline.
				if ( !( isRemoveEmpty( element ) && !element.children.length ) )
					target.add( element );

				if ( element.name == 'pre' )
					inPre = false;

				if ( element.name == 'textarea' )
					inTextarea = false;
			}

			if ( element.returnPoint ) {
				currentNode = element.returnPoint;
				delete element.returnPoint;
			} else {
				currentNode = moveCurrent ? target : savedCurrent;
			}
		}

		// Auto paragraphing should happen when inline content enters the root element.
		function checkAutoParagraphing( parent, node ) {

			// Check for parent that can contain block.
			if ( ( parent == root || parent.name == 'body' ) && fixingBlock &&
					( !parent.name || CKEDITOR.dtd[ parent.name ][ fixingBlock ] ) ) {
				var name, realName;

				if ( node.attributes && ( realName = node.attributes[ 'data-cke-real-element-type' ] ) )
					name = realName;
				else
					name = node.name;

				// Text node, inline elements are subjected, except for <script>/<style>.
				return name && name in CKEDITOR.dtd.$inline &&
					!( name in CKEDITOR.dtd.head ) &&
					!node.isOrphan ||
					node.type == CKEDITOR.NODE_TEXT;
			}
		}

		// Judge whether two element tag names are likely the siblings from the same
		// structural element.
		function possiblySibling( tag1, tag2 ) {

			if ( tag1 in CKEDITOR.dtd.$listItem || tag1 in CKEDITOR.dtd.$tableContent )
				return tag1 == tag2 || tag1 == 'dt' && tag2 == 'dd' || tag1 == 'dd' && tag2 == 'dt';

			return false;
		}

		parser.onTagOpen = function( tagName, attributes, selfClosing, optionalClose ) {
			var element = new CKEDITOR.htmlParser.element( tagName, attributes );

			// "isEmpty" will be always "false" for unknown elements, so we
			// must force it if the parser has identified it as a selfClosing tag.
			if ( element.isUnknown && selfClosing )
				element.isEmpty = true;

			// Check for optional closed elements, including browser quirks and manually opened blocks.
			element.isOptionalClose = optionalClose;

			// This is a tag to be removed if empty, so do not add it immediately.
			if ( isRemoveEmpty( element ) ) {
				pendingInline.push( element );
				return;
			} else if ( tagName == 'pre' )
				inPre = true;
			else if ( tagName == 'br' && inPre ) {
				currentNode.add( new CKEDITOR.htmlParser.text( '\n' ) );
				return;
			} else if ( tagName == 'textarea' ) {
				inTextarea = true;
			}

			if ( tagName == 'br' ) {
				pendingBRs.push( element );
				return;
			}

			while ( 1 ) {
				var currentName = currentNode.name;

				var currentDtd = currentName ? ( CKEDITOR.dtd[ currentName ] || ( currentNode._.isBlockLike ? CKEDITOR.dtd.div : CKEDITOR.dtd.span ) ) : rootDtd;

				// If the element cannot be child of the current element.
				if ( !element.isUnknown && !currentNode.isUnknown && !currentDtd[ tagName ] ) {
					// Current node doesn't have a close tag, time for a close
					// as this element isn't fit in. (https://dev.ckeditor.com/ticket/7497)
					if ( currentNode.isOptionalClose )
						parser.onTagClose( currentName );
					// Fixing malformed nested lists by moving it into a previous list item. (https://dev.ckeditor.com/ticket/3828)
					else if ( tagName in listBlocks && currentName in listBlocks ) {
						var children = currentNode.children,
							lastChild = children[ children.length - 1 ];

						// Establish the list item if it's not existed.
						if ( !( lastChild && lastChild.name == 'li' ) )
							addElement( ( lastChild = new CKEDITOR.htmlParser.element( 'li' ) ), currentNode );

						!element.returnPoint && ( element.returnPoint = currentNode );
						currentNode = lastChild;
					}
					// Establish new list root for orphan list items, but NOT to create
					// new list for the following ones, fix them instead. (https://dev.ckeditor.com/ticket/6975)
					// <dl><dt>foo<dd>bar</dl>
					// <ul><li>foo<li>bar</ul>
					else if ( tagName in CKEDITOR.dtd.$listItem &&
							!possiblySibling( tagName, currentName ) ) {
						parser.onTagOpen( tagName == 'li' ? 'ul' : 'dl', {}, 0, 1 );
					}
					// We're inside a structural block like table and list, AND the incoming element
					// is not of the same type (e.g. <td>td1<td>td2</td>), we simply add this new one before it,
					// and most importantly, return back to here once this element is added,
					// e.g. <table><tr><td>td1</td><p>p1</p><td>td2</td></tr></table>
					else if ( currentName in nonBreakingBlocks &&
							!possiblySibling( tagName, currentName ) ) {
						!element.returnPoint && ( element.returnPoint = currentNode );
						currentNode = currentNode.parent;
					} else {
						// The current element is an inline element, which
						// need to be continued even after the close, so put
						// it in the pending list.
						if ( currentName in CKEDITOR.dtd.$inline )
							pendingInline.unshift( currentNode );

						// The most common case where we just need to close the
						// current one and append the new one to the parent.
						if ( currentNode.parent )
							addElement( currentNode, currentNode.parent, 1 );
						// We've tried our best to fix the embarrassment here, while
						// this element still doesn't find it's parent, mark it as
						// orphan and show our tolerance to it.
						else {
							element.isOrphan = 1;
							break;
						}
					}
				} else {
					break;
				}
			}

			checkPending( tagName );
			sendPendingBRs();

			element.parent = currentNode;

			if ( element.isEmpty )
				addElement( element );
			else
				currentNode = element;
		};

		parser.onTagClose = function( tagName ) {
			// Check if there is any pending tag to be closed.
			for ( var i = pendingInline.length - 1; i >= 0; i-- ) {
				// If found, just remove it from the list.
				if ( tagName == pendingInline[ i ].name ) {
					pendingInline.splice( i, 1 );
					return;
				}
			}

			var pendingAdd = [],
				newPendingInline = [],
				candidate = currentNode;

			while ( candidate != root && candidate.name != tagName ) {
				// If this is an inline element, add it to the pending list, if we're
				// really closing one of the parents element later, they will continue
				// after it.
				if ( !candidate._.isBlockLike )
					newPendingInline.unshift( candidate );

				// This node should be added to it's parent at this point. But,
				// it should happen only if the closing tag is really closing
				// one of the nodes. So, for now, we just cache it.
				pendingAdd.push( candidate );

				// Make sure return point is properly restored.
				candidate = candidate.returnPoint || candidate.parent;
			}

			if ( candidate != root ) {
				// Add all elements that have been found in the above loop.
				for ( i = 0; i < pendingAdd.length; i++ ) {
					var node = pendingAdd[ i ];
					addElement( node, node.parent );
				}

				currentNode = candidate;

				if ( candidate._.isBlockLike )
					sendPendingBRs();

				addElement( candidate, candidate.parent );

				// The parent should start receiving new nodes now, except if
				// addElement changed the currentNode.
				if ( candidate == currentNode )
					currentNode = currentNode.parent;

				pendingInline = pendingInline.concat( newPendingInline );
			}

			if ( tagName == 'body' )
				fixingBlock = false;
		};

		parser.onText = function( text ) {
			// Trim empty spaces at beginning of text contents except <pre> and <textarea>.
			if ( ( !currentNode._.hasInlineStarted || pendingBRs.length ) && !inPre && !inTextarea ) {
				text = CKEDITOR.tools.ltrim( text );

				if ( text.length === 0 )
					return;
			}

			var currentName = currentNode.name,
				currentDtd = currentName ? ( CKEDITOR.dtd[ currentName ] || ( currentNode._.isBlockLike ? CKEDITOR.dtd.div : CKEDITOR.dtd.span ) ) : rootDtd;

			// Fix orphan text in list/table. (https://dev.ckeditor.com/ticket/8540) (https://dev.ckeditor.com/ticket/8870)
			if ( !inTextarea && !currentDtd[ '#' ] && currentName in nonBreakingBlocks ) {
				parser.onTagOpen( structureFixes[ currentName ] || '' );
				parser.onText( text );
				return;
			}

			sendPendingBRs();
			checkPending();

			// Shrinking consequential spaces into one single for all elements
			// text contents.
			if ( !inPre && !inTextarea )
				text = text.replace( /[\t\r\n ]{2,}|[\t\r\n]/g, ' ' );

			text = new CKEDITOR.htmlParser.text( text );


			if ( checkAutoParagraphing( currentNode, text ) )
				this.onTagOpen( fixingBlock, {}, 0, 1 );

			currentNode.add( text );
		};

		parser.onCDATA = function( cdata ) {
			currentNode.add( new CKEDITOR.htmlParser.cdata( cdata ) );
		};

		parser.onComment = function( comment ) {
			sendPendingBRs();
			checkPending();
			currentNode.add( new CKEDITOR.htmlParser.comment( comment ) );
		};

		// Parse it.
		parser.parse( fragmentHtml );

		sendPendingBRs();

		// Close all pending nodes, make sure return point is properly restored.
		while ( currentNode != root )
			addElement( currentNode, currentNode.parent, 1 );

		removeTailWhitespace( root );

		return root;
	};

	CKEDITOR.htmlParser.fragment.prototype = {

		/**
		 * The node type. This is a constant value set to {@link CKEDITOR#NODE_DOCUMENT_FRAGMENT}.
		 *
		 * @readonly
		 * @property {Number} [=CKEDITOR.NODE_DOCUMENT_FRAGMENT]
		 */
		type: CKEDITOR.NODE_DOCUMENT_FRAGMENT,

		/**
		 * Adds a node to this fragment.
		 *
		 * @param {CKEDITOR.htmlParser.node} node The node to be added.
		 * @param {Number} [index] From where the insertion happens.
		 */
		add: function( node, index ) {
			isNaN( index ) && ( index = this.children.length );

			var previous = index > 0 ? this.children[ index - 1 ] : null;
			if ( previous ) {
				// If the block to be appended is following text, trim spaces at
				// the right of it.
				if ( node._.isBlockLike && previous.type == CKEDITOR.NODE_TEXT ) {
					previous.value = CKEDITOR.tools.rtrim( previous.value );

					// If we have completely cleared the previous node.
					if ( previous.value.length === 0 ) {
						// Remove it from the list and add the node again.
						this.children.pop();
						this.add( node );
						return;
					}
				}

				previous.next = node;
			}

			node.previous = previous;
			node.parent = this;

			this.children.splice( index, 0, node );

			if ( !this._.hasInlineStarted )
				this._.hasInlineStarted = node.type == CKEDITOR.NODE_TEXT || ( node.type == CKEDITOR.NODE_ELEMENT && !node._.isBlockLike );
		},

		/**
		 * Filter this fragment's content with given filter.
		 *
		 * @since 4.1.0
		 * @param {CKEDITOR.htmlParser.filter} filter
		 */
		filter: function( filter, context ) {
			context = this.getFilterContext( context );

			// Apply the root filter.
			filter.onRoot( context, this );

			this.filterChildren( filter, false, context );
		},

		/**
		 * Filter this fragment's children with given filter.
		 *
		 * Element's children may only be filtered once by one
		 * instance of filter.
		 *
		 * @since 4.1.0
		 * @param {CKEDITOR.htmlParser.filter} filter
		 * @param {Boolean} [filterRoot] Whether to apply the "root" filter rule specified in the `filter`.
		 */
		filterChildren: function( filter, filterRoot, context ) {
			// If this element's children were already filtered
			// by current filter, don't filter them 2nd time.
			// This situation may occur when filtering bottom-up
			// (filterChildren() called manually in element's filter),
			// or in unpredictable edge cases when filter
			// is manipulating DOM structure.
			if ( this.childrenFilteredBy == filter.id )
				return;

			context = this.getFilterContext( context );

			// Filtering root if enforced.
			if ( filterRoot && !this.parent )
				filter.onRoot( context, this );

			this.childrenFilteredBy = filter.id;

			// Don't cache anything, children array may be modified by filter rule.
			for ( var i = 0; i < this.children.length; i++ ) {
				// Stay in place if filter returned false, what means
				// that node has been removed.
				if ( this.children[ i ].filter( filter, context ) === false )
					i--;
			}
		},

		/**
		 * Writes the fragment HTML to a {@link CKEDITOR.htmlParser.basicWriter}.
		 *
		 *		var writer = new CKEDITOR.htmlWriter();
		 *		var fragment = CKEDITOR.htmlParser.fragment.fromHtml( '<P><B>Example' );
		 *		fragment.writeHtml( writer );
		 *		alert( writer.getHtml() ); // '<p><b>Example</b></p>'
		 *
		 * @param {CKEDITOR.htmlParser.basicWriter} writer The writer to which write the HTML.
		 * @param {CKEDITOR.htmlParser.filter} [filter] The filter to use when writing the HTML.
		 */
		writeHtml: function( writer, filter ) {
			if ( filter )
				this.filter( filter );

			this.writeChildrenHtml( writer );
		},

		/**
		 * Write and filtering the child nodes of this fragment.
		 *
		 * @param {CKEDITOR.htmlParser.basicWriter} writer The writer to which write the HTML.
		 * @param {CKEDITOR.htmlParser.filter} [filter] The filter to use when writing the HTML.
		 * @param {Boolean} [filterRoot] Whether to apply the "root" filter rule specified in the `filter`.
		 */
		writeChildrenHtml: function( writer, filter, filterRoot ) {
			var context = this.getFilterContext();

			// Filtering root if enforced.
			if ( filterRoot && !this.parent && filter )
				filter.onRoot( context, this );

			if ( filter )
				this.filterChildren( filter, false, context );

			for ( var i = 0, children = this.children, l = children.length; i < l; i++ )
				children[ i ].writeHtml( writer );
		},

		/**
		 * Execute callback on each node (of given type) in this document fragment.
		 *
		 *		var fragment = CKEDITOR.htmlParser.fragment.fromHtml( '<p>foo<b>bar</b>bom</p>' );
		 *		fragment.forEach( function( node ) {
		 *			console.log( node );
		 *		} );
		 *		// Will log:
		 *		// 1. document fragment,
		 *		// 2. <p> element,
		 *		// 3. "foo" text node,
		 *		// 4. <b> element,
		 *		// 5. "bar" text node,
		 *		// 6. "bom" text node.
		 *
		 * @since 4.1.0
		 * @param {Function} callback Function to be executed on every node.
		 * **Since 4.3.0** if `callback` returned `false` descendants of current node will be ignored.
		 * @param {CKEDITOR.htmlParser.node} callback.node Node passed as argument.
		 * @param {Number} [type] If specified `callback` will be executed only on nodes of this type.
		 * @param {Boolean} [skipRoot] Don't execute `callback` on this fragment.
		 */
		forEach: function( callback, type, skipRoot ) {
			if ( !skipRoot && ( !type || this.type == type ) )
				var ret = callback( this );

			// Do not filter children if callback returned false.
			if ( ret === false )
				return;

			var children = this.children,
				node,
				i = 0;

			// We do not cache the size, because the list of nodes may be changed by the callback.
			for ( ; i < children.length; i++ ) {
				node = children[ i ];
				if ( node.type == CKEDITOR.NODE_ELEMENT )
					node.forEach( callback, type );
				else if ( !type || node.type == type )
					callback( node );
			}
		},

		getFilterContext: function( context ) {
			return context || {};
		}
	};
} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

'use strict';

( function() {
	/**
	 * Filter is a configurable tool for transforming and filtering {@link CKEDITOR.htmlParser.node nodes}.
	 * It is mainly used during data processing phase which is done not on real DOM nodes,
	 * but on their simplified form represented by {@link CKEDITOR.htmlParser.node} class and its subclasses.
	 *
	 *		var filter = new CKEDITOR.htmlParser.filter( {
	 *			text: function( value ) {
	 *				return '@' + value + '@';
	 *			},
	 *			elements: {
	 *				p: function( element ) {
	 *					element.attributes.foo = '1';
	 *				}
	 *			}
	 *		} );
	 *
	 *		var fragment = CKEDITOR.htmlParser.fragment.fromHtml( '<p>Foo<b>bar!</b></p>' ),
	 *			writer = new CKEDITOR.htmlParser.basicWriter();
	 *		filter.applyTo( fragment );
	 *		fragment.writeHtml( writer );
	 *		writer.getHtml(); // '<p foo="1">@Foo@<b>@bar!@</b></p>'
	 *
	 * @class
	 */
	CKEDITOR.htmlParser.filter = CKEDITOR.tools.createClass( {
		/**
		 * @constructor Creates a filter class instance.
		 * @param {CKEDITOR.htmlParser.filterRulesDefinition} [rules]
		 */
		$: function( rules ) {
			/**
			 * ID of filter instance, which is used to mark elements
			 * to which this filter has been already applied.
			 *
			 * @property {Number} id
			 * @readonly
			 */
			this.id = CKEDITOR.tools.getNextNumber();

			/**
			 * Rules for element names.
			 *
			 * @property {CKEDITOR.htmlParser.filterRulesGroup}
			 * @readonly
			 */
			this.elementNameRules = new filterRulesGroup();

			/**
			 * Rules for attribute names.
			 *
			 * @property {CKEDITOR.htmlParser.filterRulesGroup}
			 * @readonly
			 */
			this.attributeNameRules = new filterRulesGroup();

			/**
			 * Hash of elementName => {@link CKEDITOR.htmlParser.filterRulesGroup rules for elements}.
			 *
			 * @readonly
			 */
			this.elementsRules = {};

			/**
			 * Hash of attributeName => {@link CKEDITOR.htmlParser.filterRulesGroup rules for attributes}.
			 *
			 * @readonly
			 */
			this.attributesRules = {};

			/**
			 * Rules for text nodes.
			 *
			 * @property {CKEDITOR.htmlParser.filterRulesGroup}
			 * @readonly
			 */
			this.textRules = new filterRulesGroup();

			/**
			 * Rules for comment nodes.
			 *
			 * @property {CKEDITOR.htmlParser.filterRulesGroup}
			 * @readonly
			 */
			this.commentRules = new filterRulesGroup();

			/**
			 * Rules for a root node.
			 *
			 * @property {CKEDITOR.htmlParser.filterRulesGroup}
			 * @readonly
			 */
			this.rootRules = new filterRulesGroup();

			if ( rules )
				this.addRules( rules, 10 );
		},

		proto: {
			/**
			 * Add rules to this filter.
			 *
			 * @param {CKEDITOR.htmlParser.filterRulesDefinition} rules Object containing filter rules.
			 * @param {Object/Number} [options] Object containing rules' options or a priority
			 * (for a backward compatibility with CKEditor versions up to 4.2.x).
			 * @param {Number} [options.priority=10] The priority of a rule.
			 * @param {Boolean} [options.applyToAll=false] Whether to apply rule to non-editable
			 * elements and their descendants too.
			 */
			addRules: function( rules, options ) {
				var priority;

				// Backward compatibility.
				if ( typeof options == 'number' )
					priority = options;
				// New version - try reading from options.
				else if ( options && ( 'priority' in options ) )
					priority = options.priority;

				// Defaults.
				if ( typeof priority != 'number' )
					priority = 10;
				if ( typeof options != 'object' )
					options = {};

				// Add the elementNames.
				if ( rules.elementNames )
					this.elementNameRules.addMany( rules.elementNames, priority, options );

				// Add the attributeNames.
				if ( rules.attributeNames )
					this.attributeNameRules.addMany( rules.attributeNames, priority, options );

				// Add the elements.
				if ( rules.elements )
					addNamedRules( this.elementsRules, rules.elements, priority, options );

				// Add the attributes.
				if ( rules.attributes )
					addNamedRules( this.attributesRules, rules.attributes, priority, options );

				// Add the text.
				if ( rules.text )
					this.textRules.add( rules.text, priority, options );

				// Add the comment.
				if ( rules.comment )
					this.commentRules.add( rules.comment, priority, options );

				// Add root node rules.
				if ( rules.root )
					this.rootRules.add( rules.root, priority, options );
			},

			/**
			 * Apply this filter to given node.
			 *
			 * @param {CKEDITOR.htmlParser.node} node The node to be filtered.
			 */
			applyTo: function( node ) {
				node.filter( this );
			},

			onElementName: function( context, name ) {
				return this.elementNameRules.execOnName( context, name );
			},

			onAttributeName: function( context, name ) {
				return this.attributeNameRules.execOnName( context, name );
			},

			onText: function( context, text, node ) {
				return this.textRules.exec( context, text, node );
			},

			onComment: function( context, commentText, comment ) {
				return this.commentRules.exec( context, commentText, comment );
			},

			onRoot: function( context, element ) {
				return this.rootRules.exec( context, element );
			},

			onElement: function( context, element ) {
				// We must apply filters set to the specific element name as
				// well as those set to the generic ^/$ name. So, add both to an
				// array and process them in a small loop.
				var rulesGroups = [ this.elementsRules[ '^' ], this.elementsRules[ element.name ], this.elementsRules.$ ],
					rulesGroup, ret;

				for ( var i = 0; i < 3; i++ ) {
					rulesGroup = rulesGroups[ i ];
					if ( rulesGroup ) {
						ret = rulesGroup.exec( context, element, this );

						if ( ret === false )
							return null;

						if ( ret && ret != element )
							return this.onNode( context, ret );

						// The non-root element has been dismissed by one of the filters.
						if ( element.parent && !element.name )
							break;
					}
				}

				return element;
			},

			onNode: function( context, node ) {
				var type = node.type;

				return type == CKEDITOR.NODE_ELEMENT ? this.onElement( context, node ) :
					type == CKEDITOR.NODE_TEXT ? new CKEDITOR.htmlParser.text( this.onText( context, node.value ) ) :
					type == CKEDITOR.NODE_COMMENT ? new CKEDITOR.htmlParser.comment( this.onComment( context, node.value ) ) : null;
			},

			onAttribute: function( context, element, name, value ) {
				var rulesGroup = this.attributesRules[ name ];

				if ( rulesGroup )
					return rulesGroup.exec( context, value, element, this );
				return value;
			}
		}
	} );

	/**
	 * Class grouping filter rules for one subject (like element or attribute names).
	 *
	 * @class CKEDITOR.htmlParser.filterRulesGroup
	 */
	function filterRulesGroup() {
		/**
		 * Array of objects containing rule, priority and options.
		 *
		 * @property {Object[]}
		 * @readonly
		 */
		this.rules = [];
	}

	CKEDITOR.htmlParser.filterRulesGroup = filterRulesGroup;

	filterRulesGroup.prototype = {
		/**
		 * Adds specified rule to this group.
		 *
		 * @param {Function/Array} rule Function for function based rule or [ pattern, replacement ] array for
		 * rule applicable to names.
		 * @param {Number} priority
		 * @param options
		 */
		add: function( rule, priority, options ) {
			this.rules.splice( this.findIndex( priority ), 0, {
				value: rule,
				priority: priority,
				options: options
			} );
		},

		/**
		 * Adds specified rules to this group.
		 *
		 * @param {Array} rules Array of rules - see {@link #add}.
		 * @param {Number} priority
		 * @param options
		 */
		addMany: function( rules, priority, options ) {
			var args = [ this.findIndex( priority ), 0 ];

			for ( var i = 0, len = rules.length; i < len; i++ ) {
				args.push( {
					value: rules[ i ],
					priority: priority,
					options: options
				} );
			}

			this.rules.splice.apply( this.rules, args );
		},

		/**
		 * Finds an index at which rule with given priority should be inserted.
		 *
		 * @param {Number} priority
		 * @returns {Number} Index.
		 */
		findIndex: function( priority ) {
			var rules = this.rules,
				len = rules.length,
				i = len - 1;

			// Search from the end, because usually rules will be added with default priority, so
			// we will be able to stop loop quickly.
			while ( i >= 0 && priority < rules[ i ].priority )
				i--;

			return i + 1;
		},

		/**
		 * Executes this rules group on given value. Applicable only if function based rules were added.
		 *
		 * All arguments passed to this function will be forwarded to rules' functions.
		 *
		 * @param {CKEDITOR.htmlParser.node/CKEDITOR.htmlParser.fragment/String} currentValue The value to be filtered.
		 * @returns {CKEDITOR.htmlParser.node/CKEDITOR.htmlParser.fragment/String} Filtered value.
		 */
		exec: function( context, currentValue ) {
			var isNode = currentValue instanceof CKEDITOR.htmlParser.node || currentValue instanceof CKEDITOR.htmlParser.fragment,
				// Splice '1' to remove context, which we don't want to pass to filter rules.
				args = Array.prototype.slice.call( arguments, 1 ),
				rules = this.rules,
				len = rules.length,
				orgType, orgName, ret, i, rule;

			for ( i = 0; i < len; i++ ) {
				// Backup the node info before filtering.
				if ( isNode ) {
					orgType = currentValue.type;
					orgName = currentValue.name;
				}

				rule = rules[ i ];
				if ( isRuleApplicable( context, rule ) ) {
					ret = rule.value.apply( null, args );

					if ( ret === false )
						return ret;

					// We're filtering node (element/fragment).
					// No further filtering if it's not anymore fitable for the subsequent filters.
					if ( isNode && ret && ( ret.name != orgName || ret.type != orgType ) )
						return ret;

					// Update currentValue and corresponding argument in args array.
					// Updated values will be used in next for-loop step.
					if ( ret != null )
						args[ 0 ] = currentValue = ret;

					// ret == undefined will continue loop as nothing has happened.
				}
			}

			return currentValue;
		},

		/**
		 * Executes this rules group on name. Applicable only if filter rules for names were added.
		 *
		 * @param {String} currentName The name to be filtered.
		 * @returns {String} Filtered name.
		 */
		execOnName: function( context, currentName ) {
			var i = 0,
				rules = this.rules,
				len = rules.length,
				rule;

			for ( ; currentName && i < len; i++ ) {
				rule = rules[ i ];
				if ( isRuleApplicable( context, rule ) )
					currentName = currentName.replace( rule.value[ 0 ], rule.value[ 1 ] );
			}

			return currentName;
		}
	};

	function addNamedRules( rulesGroups, newRules, priority, options ) {
		var ruleName, rulesGroup;

		for ( ruleName in newRules ) {
			rulesGroup = rulesGroups[ ruleName ];

			if ( !rulesGroup )
				rulesGroup = rulesGroups[ ruleName ] = new filterRulesGroup();

			rulesGroup.add( newRules[ ruleName ], priority, options );
		}
	}

	function isRuleApplicable( context, rule ) {
		if ( context.nonEditable && !rule.options.applyToAll )
			return false;

		if ( context.nestedEditable && rule.options.excludeNestedEditable )
			return false;

		return true;
	}

} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

( function() {
	/**
	 * Represents an HTML data processor, which is responsible for translating and
	 * transforming the editor data on input and output.
	 *
	 * @class
	 * @extends CKEDITOR.dataProcessor
	 * @constructor Creates an htmlDataProcessor class instance.
	 * @param {CKEDITOR.editor} editor
	 */
	CKEDITOR.htmlDataProcessor = function( editor ) {
		var dataFilter, htmlFilter,
			that = this;

		this.editor = editor;

		/**
		 * Data filter used when processing input by {@link #toHtml}.
		 *
		 * @property {CKEDITOR.htmlParser.filter}
		 */
		this.dataFilter = dataFilter = new CKEDITOR.htmlParser.filter();

		/**
		 * HTML filter used when processing output by {@link #toDataFormat}.
		 *
		 * @property {CKEDITOR.htmlParser.filter}
		 */
		this.htmlFilter = htmlFilter = new CKEDITOR.htmlParser.filter();

		/**
		 * The HTML writer used by this data processor to format the output.
		 *
		 * @property {CKEDITOR.htmlParser.basicWriter}
		 */
		this.writer = new CKEDITOR.htmlParser.basicWriter();

		dataFilter.addRules( defaultDataFilterRulesEditableOnly );
		dataFilter.addRules( defaultDataFilterRulesForAll, { applyToAll: true } );
		dataFilter.addRules( createBogusAndFillerRules( editor, 'data' ), { applyToAll: true } );
		htmlFilter.addRules( defaultHtmlFilterRulesEditableOnly );
		htmlFilter.addRules( defaultHtmlFilterRulesForAll, { applyToAll: true } );
		htmlFilter.addRules( createBogusAndFillerRules( editor, 'html' ), { applyToAll: true } );

		editor.on( 'toHtml', function( evt ) {
			var evtData = evt.data,
				data = evtData.dataValue,
				fixBodyTag;

			// Before we start protecting markup, make sure there's no externally injected <cke:encoded> elements. Only
			// HTML processor can use this tag, any external injections should discarded.
			data = data.replace( reservedElementsRegex, '' );

			// The source data is already HTML, but we need to clean
			// it up and apply the filter.
			data = protectSource( data, editor );

			// Protect content of textareas. (https://dev.ckeditor.com/ticket/9995)
			// Do this before protecting attributes to avoid breaking:
			// <textarea><img src="..." /></textarea>
			data = protectElements( data, protectTextareaRegex );

			// Before anything, we must protect the URL attributes as the
			// browser may changing them when setting the innerHTML later in
			// the code.
			data = protectAttributes( data );

			// Protect elements than can't be set inside a DIV. E.g. IE removes
			// style tags from innerHTML. (https://dev.ckeditor.com/ticket/3710)
			data = protectElements( data, protectElementsRegex );

			// Certain elements has problem to go through DOM operation, protect
			// them by prefixing 'cke' namespace. (https://dev.ckeditor.com/ticket/3591)
			data = protectElementsNames( data );

			// All none-IE browsers ignore self-closed custom elements,
			// protecting them into open-close. (https://dev.ckeditor.com/ticket/3591)
			data = protectSelfClosingElements( data );

			// Compensate one leading line break after <pre> open as browsers
			// eat it up. (https://dev.ckeditor.com/ticket/5789)
			data = protectPreFormatted( data );

			// There are attributes which may execute JavaScript code inside fixBin.
			// Encode them greedily. They will be unprotected right after getting HTML from fixBin. (https://dev.ckeditor.com/ticket/10)
			data = protectInsecureAttributes( data );

			var fixBin = evtData.context || editor.editable().getName(),
				isPre;

			// Old IEs loose formats when load html into <pre>.
			if ( CKEDITOR.env.ie && CKEDITOR.env.version < 9 && fixBin == 'pre' ) {
				fixBin = 'div';
				data = '<pre>' + data + '</pre>';
				isPre = 1;
			}

			// Call the browser to help us fixing a possibly invalid HTML
			// structure.
			var el = editor.document.createElement( fixBin );
			// Add fake character to workaround IE comments bug. (https://dev.ckeditor.com/ticket/3801)
			el.setHtml( 'a' + data );
			data = el.getHtml().substr( 1 );

			// Restore shortly protected attribute names.
			data = data.replace( new RegExp( 'data-cke-' + CKEDITOR.rnd + '-', 'ig' ), '' );

			isPre && ( data = data.replace( /^<pre>|<\/pre>$/gi, '' ) );

			// Unprotect "some" of the protected elements at this point.
			data = unprotectElementNames( data );

			data = unprotectElements( data );

			// Restore the comments that have been protected, in this way they
			// can be properly filtered.
			data = unprotectRealComments( data );

			if ( evtData.fixForBody === false ) {
				fixBodyTag = false;
			} else {
				fixBodyTag = getFixBodyTag( evtData.enterMode, editor.config.autoParagraph );
			}

			// Now use our parser to make further fixes to the structure, as
			// well as apply the filter.
			data = CKEDITOR.htmlParser.fragment.fromHtml( data, evtData.context, fixBodyTag );

			// The empty root element needs to be fixed by adding 'p' or 'div' into it.
			// This avoids the need to create that element on the first focus (https://dev.ckeditor.com/ticket/12630).
			if ( fixBodyTag ) {
				fixEmptyRoot( data, fixBodyTag );
			}

			evtData.dataValue = data;
		}, null, null, 5 );

		// Filter incoming "data".
		// Add element filter before htmlDataProcessor.dataFilter when purifying input data to correct html.
		editor.on( 'toHtml', function( evt ) {
			if ( evt.data.filter.applyTo( evt.data.dataValue, true, evt.data.dontFilter, evt.data.enterMode ) )
				editor.fire( 'dataFiltered' );
		}, null, null, 6 );

		editor.on( 'toHtml', function( evt ) {
			evt.data.dataValue.filterChildren( that.dataFilter, true );
		}, null, null, 10 );

		editor.on( 'toHtml', function( evt ) {
			var evtData = evt.data,
				data = evtData.dataValue,
				writer = new CKEDITOR.htmlParser.basicWriter();

			data.writeChildrenHtml( writer );
			data = writer.getHtml( true );

			// Protect the real comments again.
			evtData.dataValue = protectRealComments( data );
		}, null, null, 15 );


		editor.on( 'toDataFormat', function( evt ) {
			var data = evt.data.dataValue;

			// https://dev.ckeditor.com/ticket/10854 - we need to strip leading blockless <br> which FF adds
			// automatically when editable contains only non-editable content.
			// We do that for every browser (so it's a constant behavior) and
			// not in BR mode, in which chance of valid leading blockless <br> is higher.
			if ( evt.data.enterMode != CKEDITOR.ENTER_BR )
				data = data.replace( /^<br *\/?>/i, '' );

			evt.data.dataValue = CKEDITOR.htmlParser.fragment.fromHtml(
				data, evt.data.context, getFixBodyTag( evt.data.enterMode, editor.config.autoParagraph ) );
		}, null, null, 5 );

		editor.on( 'toDataFormat', function( evt ) {
			evt.data.dataValue.filterChildren( that.htmlFilter, true );
		}, null, null, 10 );

		// Transform outcoming "data".
		// Add element filter after htmlDataProcessor.htmlFilter when preparing output data HTML.
		editor.on( 'toDataFormat', function( evt ) {
			evt.data.filter.applyTo( evt.data.dataValue, false, true );
		}, null, null, 11 );

		editor.on( 'toDataFormat', function( evt ) {
			var data = evt.data.dataValue,
				writer = that.writer;

			writer.reset();
			data.writeChildrenHtml( writer );
			data = writer.getHtml( true );

			// Restore those non-HTML protected source. (https://dev.ckeditor.com/ticket/4475,https://dev.ckeditor.com/ticket/4880)
			data = unprotectRealComments( data );
			data = unprotectSource( data, editor );

			evt.data.dataValue = data;
		}, null, null, 15 );
	};

	CKEDITOR.htmlDataProcessor.prototype = {
		/**
		 * Processes the (potentially malformed) input HTML to a purified form which
		 * is suitable for using in the WYSIWYG editable.
		 *
		 * This method fires the {@link CKEDITOR.editor#toHtml} event which makes it possible
		 * to hook into the process at various stages.
		 *
		 * **Note:** Since CKEditor 4.3.0 the signature of this method changed and all options
		 * are now grouped in one `options` object. Previously `context`, `fixForBody` and `dontFilter`
		 * were passed separately.
		 *
		 * @param {String} data The raw data.
		 * @param {Object} [options] The options object.
		 * @param {String} [options.context] The tag name of a context element within which
		 * the input is to be processed, defaults to the editable element.
		 * If `null` is passed, then data will be parsed without context (as children of {@link CKEDITOR.htmlParser.fragment}).
		 * See {@link CKEDITOR.htmlParser.fragment#fromHtml} for more details.
		 * @param {Boolean} [options.fixForBody=true] Whether to trigger the auto paragraph for non-block content.
		 * @param {CKEDITOR.filter} [options.filter] When specified, instead of using the {@link CKEDITOR.editor#filter main filter},
		 * the passed instance will be used to filter the content.
		 * @param {Boolean} [options.dontFilter] Do not filter data with {@link CKEDITOR.filter} (note: transformations
		 * will still be applied).
		 * @param {Number} [options.enterMode] When specified, it will be used instead of the {@link CKEDITOR.editor#enterMode main enterMode}.
		 * @param {Boolean} [options.protectedWhitespaces] Indicates that content was wrapped with `<span>` elements to preserve
		 * leading and trailing whitespaces. Option used by the {@link CKEDITOR.editor#method-insertHtml} method.
		 * @returns {String}
		 */
		toHtml: function( data, options, fixForBody, dontFilter ) {
			var editor = this.editor,
				context, filter, enterMode, protectedWhitespaces;

			// Typeof null == 'object', so check truthiness of options too.
			if ( options && typeof options == 'object' ) {
				context = options.context;
				fixForBody = options.fixForBody;
				dontFilter = options.dontFilter;
				filter = options.filter;
				enterMode = options.enterMode;
				protectedWhitespaces = options.protectedWhitespaces;
			}
			// Backward compatibility. Since CKEDITOR 4.3.0 every option was a separate argument.
			else {
				context = options;
			}

			// Fall back to the editable as context if not specified.
			if ( !context && context !== null )
				context = editor.editable().getName();

			return editor.fire( 'toHtml', {
				dataValue: data,
				context: context,
				fixForBody: fixForBody,
				dontFilter: dontFilter,
				filter: filter || editor.filter,
				enterMode: enterMode || editor.enterMode,
				protectedWhitespaces: protectedWhitespaces
			} ).dataValue;
		},

		/**
		 * See {@link CKEDITOR.dataProcessor#toDataFormat}.
		 *
		 * This method fires the {@link CKEDITOR.editor#toDataFormat} event which makes it possible
		 * to hook into the process at various stages.
		 *
		 * @param {String} html
		 * @param {Object} [options] The options object.
		 * @param {String} [options.context] The tag name of the context element within which
		 * the input is to be processed, defaults to the editable element.
		 * @param {CKEDITOR.filter} [options.filter] When specified, instead of using the {@link CKEDITOR.editor#filter main filter},
		 * the passed instance will be used to apply content transformations to the content.
		 * @param {Number} [options.enterMode] When specified, it will be used instead of the {@link CKEDITOR.editor#enterMode main enterMode}.
		 * @returns {String}
		 */
		toDataFormat: function( html, options ) {
			var context, filter, enterMode;

			// Do not shorten this to `options && options.xxx`, because
			// falsy `options` will be passed instead of undefined.
			if ( options ) {
				context = options.context;
				filter = options.filter;
				enterMode = options.enterMode;
			}

			// Fall back to the editable as context if not specified.
			if ( !context && context !== null )
				context = this.editor.editable().getName();

			return this.editor.fire( 'toDataFormat', {
				dataValue: html,
				filter: filter || this.editor.filter,
				context: context,
				enterMode: enterMode || this.editor.enterMode
			} ).dataValue;
		}
	};

	// Produce a set of filtering rules that handles bogus and filler node at the
	// end of block/pseudo block, in the following consequence:
	// 1. elements:<block> - this filter removes any bogus node, then check
	// if it's an empty block that requires a filler.
	// 2. elements:<br> - After cleaned with bogus, this filter checks the real
	// line-break BR to compensate a filler after it.
	//
	// Terms definitions:
	// filler: An element that's either <BR> or &NBSP; at the end of block that established line height.
	// bogus: Whenever a filler is proceeded with inline content, it becomes a bogus which is subjected to be removed.
	//
	// Various forms of the filler:
	// In output HTML: Filler should be consistently &NBSP; <BR> at the end of block is always considered as bogus.
	// In Wysiwyg HTML: Browser dependent - see env.needsBrFiller. Either BR for when needsBrFiller is true, or &NBSP; otherwise.
	// <BR> is NEVER considered as bogus when needsBrFiller is true.
	function createBogusAndFillerRules( editor, type ) {
		function createFiller( isOutput ) {
			return isOutput || CKEDITOR.env.needsNbspFiller ?
				new CKEDITOR.htmlParser.text( '\xa0' ) :
				new CKEDITOR.htmlParser.element( 'br', { 'data-cke-bogus': 1 } );
		}

		// This text block filter, remove any bogus and create the filler on demand.
		function blockFilter( isOutput, fillEmptyBlock ) {

			return function( block ) {
				// DO NOT apply the filler if it's a fragment node.
				if ( block.type == CKEDITOR.NODE_DOCUMENT_FRAGMENT )
					return;

				cleanBogus( block );

				// Add fillers to input (always) and to output (if fillEmptyBlock is ok with that).
				var shouldFillBlock = !isOutput ||
					( typeof fillEmptyBlock == 'function' ? fillEmptyBlock( block ) : fillEmptyBlock ) !== false;

				if ( shouldFillBlock && isEmptyBlockNeedFiller( block ) ) {
					block.add( createFiller( isOutput ) );
				}
			};
		}

		// Append a filler right after the last line-break BR, found at the end of block.
		function brFilter( isOutput ) {
			return function( br ) {
				// DO NOT apply the filer if parent's a fragment node.
				if ( br.parent.type == CKEDITOR.NODE_DOCUMENT_FRAGMENT )
					return;

				var attrs = br.attributes;
				// Dismiss BRs that are either bogus or eol marker.
				if ( 'data-cke-bogus' in attrs || 'data-cke-eol' in attrs ) {
					delete attrs [ 'data-cke-bogus' ];
					return;
				}

				// Judge the tail line-break BR, and to insert bogus after it.
				var next = getNext( br ), previous = getPrevious( br );

				if ( !next && isBlockBoundary( br.parent ) )
					append( br.parent, createFiller( isOutput ) );
				else if ( isBlockBoundary( next ) && previous && !isBlockBoundary( previous ) )
					createFiller( isOutput ).insertBefore( next );
			};
		}

		// Determinate whether this node is potentially a bogus node.
		function maybeBogus( node, atBlockEnd ) {

			// BR that's not from IE<11 DOM, except for a EOL marker.
			if ( !( isOutput && !CKEDITOR.env.needsBrFiller ) &&
					node.type == CKEDITOR.NODE_ELEMENT && node.name == 'br' &&
					!node.attributes[ 'data-cke-eol' ] ) {
				return true;
			}

			var match;

			// NBSP, possibly.
			if ( node.type == CKEDITOR.NODE_TEXT && ( match = node.value.match( tailNbspRegex ) ) ) {
				// We need to separate tail NBSP out of a text node, for later removal.
				if ( match.index ) {
					( new CKEDITOR.htmlParser.text( node.value.substring( 0, match.index ) ) ).insertBefore( node );
					node.value = match[ 0 ];
				}

				// From IE<11 DOM, at the end of a text block, or before block boundary.
				if ( !CKEDITOR.env.needsBrFiller && isOutput && ( !atBlockEnd || node.parent.name in textBlockTags ) )
					return true;

				// From the output.
				if ( !isOutput ) {
					var previous = node.previous;

					// Following a line-break at the end of block.
					if ( previous && previous.name == 'br' )
						return true;

					// Or a single NBSP between two blocks.
					if ( !previous || isBlockBoundary( previous ) )
						return true;
				}
			}

			return false;
		}

		// Removes all bogus inside of this block, and to convert fillers into the proper form.
		function cleanBogus( block ) {
			var bogus = [];
			var last = getLast( block ), node, previous;

			if ( last ) {
				// Check for bogus at the end of this block.
				// e.g. <p>foo<br /></p>
				maybeBogus( last, 1 ) && bogus.push( last );

				while ( last ) {
					// Check for bogus at the end of any pseudo block contained.
					if ( isBlockBoundary( last ) && ( node = getPrevious( last ) ) && maybeBogus( node ) ) {
						// Bogus must have inline proceeding, instead single BR between two blocks,
						// is considered as filler, e.g. <hr /><br /><hr />
						if ( ( previous = getPrevious( node ) ) && !isBlockBoundary( previous ) )
							bogus.push( node );
						// Convert the filler into appropriate form.
						else {
							createFiller( isOutput ).insertAfter( node );
							node.remove();
						}
					}

					last = last.previous;
				}
			}

			// Now remove all bogus collected from above.
			for ( var i = 0 ; i < bogus.length ; i++ )
				bogus[ i ].remove();
		}

		// Judge whether it's an empty block that requires a filler node.
		function isEmptyBlockNeedFiller( block ) {

			// DO NOT fill empty editable in IE<11.
			if ( !isOutput && !CKEDITOR.env.needsBrFiller && block.type == CKEDITOR.NODE_DOCUMENT_FRAGMENT )
				return false;

			// 1. For IE version >=8,  empty blocks are displayed correctly themself in wysiwiyg;
			// 2. For the rest, at least table cell and list item need no filler space. (https://dev.ckeditor.com/ticket/6248)
			if ( !isOutput && !CKEDITOR.env.needsBrFiller &&
				( document.documentMode > 7 ||
					block.name in CKEDITOR.dtd.tr ||
					block.name in CKEDITOR.dtd.$listItem ) ) {
				return false;
			}

			var last = getLast( block );
			return !last || block.name == 'form' && last.name == 'input' ;
		}

		var rules = { elements: {} },
			isOutput = type == 'html',
			textBlockTags = CKEDITOR.tools.extend( {}, blockLikeTags );

		// Build the list of text blocks.
		for ( var i in textBlockTags ) {
			if ( !( '#' in dtd[ i ] ) )
				delete textBlockTags[ i ];
		}

		for ( i in textBlockTags )
			rules.elements[ i ] = blockFilter( isOutput, editor.config.fillEmptyBlocks );

		// Editable element has to be checked separately.
		rules.root = blockFilter( isOutput, false );
		rules.elements.br = brFilter( isOutput );
		return rules;
	}

	function getFixBodyTag( enterMode, autoParagraph ) {
		return ( enterMode != CKEDITOR.ENTER_BR && autoParagraph !== false ) ? enterMode == CKEDITOR.ENTER_DIV ? 'div' : 'p' : false;
	}

	// Regex to scan for &nbsp; at the end of blocks, which are actually placeholders.
	// Safari transforms the &nbsp; to \xa0. (https://dev.ckeditor.com/ticket/4172)
	var tailNbspRegex = /(?:&nbsp;|\xa0)$/;

	var protectedSourceMarker = '{cke_protected}';

	function getLast( node ) {
		var last = node.children[ node.children.length - 1 ];
		while ( last && isEmpty( last ) )
			last = last.previous;
		return last;
	}

	function getNext( node ) {
		var next = node.next;
		while ( next && isEmpty( next ) )
			next = next.next;
		return next;
	}

	function getPrevious( node ) {
		var previous = node.previous;
		while ( previous && isEmpty( previous ) )
			previous = previous.previous;
		return previous;
	}

	// Judge whether the node is an ghost node to be ignored, when traversing.
	function isEmpty( node ) {
		return node.type == CKEDITOR.NODE_TEXT &&
			!CKEDITOR.tools.trim( node.value ) ||
			node.type == CKEDITOR.NODE_ELEMENT &&
			node.attributes[ 'data-cke-bookmark' ];
	}

	// Judge whether the node is a block-like element.
	function isBlockBoundary( node ) {
		return node &&
			( node.type == CKEDITOR.NODE_ELEMENT && node.name in blockLikeTags ||
			node.type == CKEDITOR.NODE_DOCUMENT_FRAGMENT );
	}

	function append( parent, node ) {
		var last = parent.children[ parent.children.length - 1 ];
		parent.children.push( node );
		node.parent = parent;
		if ( last ) {
			last.next = node;
			node.previous = last;
		}
	}

	function getNodeIndex( node ) {
		return node.parent ? node.getIndex() : -1;
	}

	var dtd = CKEDITOR.dtd,
		// Define orders of table elements.
		tableOrder = [ 'caption', 'colgroup', 'col', 'thead', 'tfoot', 'tbody' ],
		// List of all block elements.
		blockLikeTags = CKEDITOR.tools.extend( {}, dtd.$blockLimit, dtd.$block );

	//
	// DATA filter rules ------------------------------------------------------
	//

	var defaultDataFilterRulesEditableOnly = {
		elements: {
			input: protectReadOnly,
			textarea: protectReadOnly
		}
	};

	// These rules will also be applied to non-editable content.
	var defaultDataFilterRulesForAll = {
		attributeNames: [
			// Event attributes (onXYZ) must not be directly set. They can become
			// active in the editing area (IE|WebKit).
			[ ( /^on/ ), 'data-cke-pa-on' ],

			// Prevent iframe's srcdoc attribute from being evaluated in the editable.
			[ ( /^srcdoc/ ), 'data-cke-pa-srcdoc' ],

			// Don't let some old expando enter editor. Concerns only IE8,
			// but for consistency remove on all browsers.
			[ ( /^data-cke-expando$/ ), '' ]
		],

		elements: {
			// Prevent iframe's src attribute with javascript code or data protocol from being evaluated in the editable.
			iframe: function( element ) {
				if ( element.attributes && element.attributes.src ) {

					var src = element.attributes.src.toLowerCase().replace( /[^a-z]/gi, '' );
					if ( src.indexOf( 'javascript' ) === 0 || src.indexOf( 'data' ) === 0 ) {
						element.attributes[ 'data-cke-pa-src' ] = element.attributes.src;
						delete element.attributes.src;
					}
				}
			}
		}
	};

	// Disable form elements editing mode provided by some browsers. (https://dev.ckeditor.com/ticket/5746)
	function protectReadOnly( element ) {
		var attrs = element.attributes;

		// We should flag that the element was locked by our code so
		// it'll be editable by the editor functions (https://dev.ckeditor.com/ticket/6046).
		if ( attrs.contenteditable != 'false' )
			attrs[ 'data-cke-editable' ] = attrs.contenteditable ? 'true' : 1;

		attrs.contenteditable = 'false';
	}

	//
	// HTML filter rules ------------------------------------------------------
	//

	var defaultHtmlFilterRulesEditableOnly = {
		elements: {
			embed: function( element ) {
				var parent = element.parent;

				// If the <embed> is child of a <object>, copy the width
				// and height attributes from it.
				if ( parent && parent.name == 'object' ) {
					var parentWidth = parent.attributes.width,
						parentHeight = parent.attributes.height;
					if ( parentWidth )
						element.attributes.width = parentWidth;
					if ( parentHeight )
						element.attributes.height = parentHeight;
				}
			},

			// Remove empty link but not empty anchor. (https://dev.ckeditor.com/ticket/3829, https://dev.ckeditor.com/ticket/13516)
			a: function( element ) {
				var attrs = element.attributes;

				if ( !( element.children.length || attrs.name || attrs.id || element.attributes[ 'data-cke-saved-name' ] ) )
					return false;
			}
		}
	};

	// These rules will also be applied to non-editable content.
	var defaultHtmlFilterRulesForAll = {
		elementNames: [
			// Remove the "cke:" namespace prefix.
			[ ( /^cke:/ ), '' ],

			// Ignore <?xml:namespace> tags.
			[ ( /^\?xml:namespace$/ ), '' ]
		],

		attributeNames: [
			// Attributes saved for changes and protected attributes.
			[ ( /^data-cke-(saved|pa)-/ ), '' ],

			// All "data-cke-" attributes are to be ignored.
			[ ( /^data-cke-.*/ ), '' ],

			[ 'hidefocus', '' ]
		],

		elements: {
			$: function( element ) {
				var attribs = element.attributes;

				if ( attribs ) {
					// Elements marked as temporary are to be ignored.
					if ( attribs[ 'data-cke-temp' ] )
						return false;

					// Remove duplicated attributes - https://dev.ckeditor.com/ticket/3789.
					var attributeNames = [ 'name', 'href', 'src' ],
						savedAttributeName;
					for ( var i = 0; i < attributeNames.length; i++ ) {
						savedAttributeName = 'data-cke-saved-' + attributeNames[ i ];
						savedAttributeName in attribs && ( delete attribs[ attributeNames[ i ] ] );
					}
				}

				return element;
			},

			// The contents of table should be in correct order (https://dev.ckeditor.com/ticket/4809).
			table: function( element ) {
				// Clone the array as it would become empty during the sort call.
				var children = element.children.slice( 0 );

				children.sort( function( node1, node2 ) {
					var index1, index2;

					// Compare in the predefined order.
					if ( node1.type == CKEDITOR.NODE_ELEMENT && node2.type == node1.type ) {
						index1 = CKEDITOR.tools.indexOf( tableOrder, node1.name );
						index2 = CKEDITOR.tools.indexOf( tableOrder, node2.name );
					}

					// Make sure the sort is stable, if no order can be established above.
					if ( !( index1 > -1 && index2 > -1 && index1 != index2 ) ) {
						index1 = getNodeIndex( node1 );
						index2 = getNodeIndex( node2 );
					}

					return index1 > index2 ? 1 : -1;
				} );
			},

			// Restore param elements into self-closing.
			param: function( param ) {
				param.children = [];
				param.isEmpty = true;
				return param;
			},

			// Remove dummy span in webkit.
			span: function( element ) {
				if ( element.attributes[ 'class' ] == 'Apple-style-span' )
					delete element.name;
			},

			html: function( element ) {
				delete element.attributes.contenteditable;
				delete element.attributes[ 'class' ];
			},

			body: function( element ) {
				delete element.attributes.spellcheck;
				delete element.attributes.contenteditable;
			},

			style: function( element ) {
				var child = element.children[ 0 ];
				if ( child && child.value )
					child.value = CKEDITOR.tools.trim( child.value );

				if ( !element.attributes.type )
					element.attributes.type = 'text/css';
			},

			title: function( element ) {
				var titleText = element.children[ 0 ];

				// Append text-node to title tag if not present (i.e. non-IEs) (https://dev.ckeditor.com/ticket/9882).
				!titleText && append( element, titleText = new CKEDITOR.htmlParser.text() );

				// Transfer data-saved title to title tag.
				titleText.value = element.attributes[ 'data-cke-title' ] || '';
			},

			input: unprotectReadyOnly,
			textarea: unprotectReadyOnly
		},

		attributes: {
			'class': function( value ) {
				// Remove all class names starting with "cke_".
				return CKEDITOR.tools.ltrim( value.replace( /(?:^|\s+)cke_[^\s]*/g, '' ) ) || false;
			}
		}
	};

	if ( CKEDITOR.env.ie ) {
		// IE outputs style attribute in capital letters. We should convert
		// them back to lower case, while not hurting the values (https://dev.ckeditor.com/ticket/5930)
		defaultHtmlFilterRulesForAll.attributes.style = function( value ) {
			return value.replace( /(^|;)([^\:]+)/g, function( match ) {
				return match.toLowerCase();
			} );
		};
	}

	// Disable form elements editing mode provided by some browsers. (https://dev.ckeditor.com/ticket/5746)
	function unprotectReadyOnly( element ) {
		var attrs = element.attributes;
		switch ( attrs[ 'data-cke-editable' ] ) {
			case 'true':
				attrs.contenteditable = 'true';
				break;
			case '1':
				delete attrs.contenteditable;
				break;
		}
	}

	//
	// Preprocessor filters ---------------------------------------------------
	//

	var protectElementRegex = /<(a|area|img|input|source)\b([^>]*)>/gi,
		// Be greedy while looking for protected attributes. This will let us avoid an unfortunate
		// situation when "nested attributes", which may appear valid, are also protected.
		// I.e. if we consider the following HTML:
		//
		// 	<img data-x="&lt;a href=&quot;X&quot;" />
		//
		// then the "non-greedy match" returns:
		//
		// 	'href' => '&quot;X&quot;' // It's wrong! Href is not an attribute of <img>.
		//
		// while greedy match returns:
		//
		// 	'data-x' => '&lt;a href=&quot;X&quot;'
		//
		// which, can be easily filtered out (https://dev.ckeditor.com/ticket/11508).
		protectAttributeRegex = /([\w-:]+)\s*=\s*(?:(?:"[^"]*")|(?:'[^']*')|(?:[^ "'>]+))/gi,
		protectAttributeNameRegex = /^(href|src|name)$/i;

		// Note: we use lazy star '*?' to prevent eating everything up to the last occurrence of </style> or </textarea>.
	var protectElementsRegex = /(?:<style(?=[ >])[^>]*>[\s\S]*?<\/style>)|(?:<(:?link|meta|base)[^>]*>)/gi,
		protectTextareaRegex = /(<textarea(?=[ >])[^>]*>)([\s\S]*?)(?:<\/textarea>)/gi,
		encodedElementsRegex = /<cke:encoded>([^<]*)<\/cke:encoded>/gi,
		reservedElementsRegex = createReservedElementsRegex();

		// Element name should be followed by space or closing angle bracket '>' to not protect custom tags (#988).
	var protectElementNamesRegex = /(<\/?)((?:object|embed|param|html|body|head|title)([\s][^>]*)?>)/gi,
		unprotectElementNamesRegex = /(<\/?)cke:((?:html|body|head|title)[^>]*>)/gi;

	var protectSelfClosingRegex = /<cke:(param|embed)([^>]*?)\/?>(?!\s*<\/cke:\1)/gi;

	function protectAttributes( html ) {
		return html.replace( protectElementRegex, function( element, tag, attributes ) {
			return '<' + tag + attributes.replace( protectAttributeRegex, function( fullAttr, attrName ) {
				// Avoid corrupting the inline event attributes (https://dev.ckeditor.com/ticket/7243).
				// We should not rewrite the existed protected attributes, e.g. clipboard content from editor. (https://dev.ckeditor.com/ticket/5218)
				if ( protectAttributeNameRegex.test( attrName ) && attributes.indexOf( 'data-cke-saved-' + attrName ) == -1 )
					return ' data-cke-saved-' + fullAttr + ' data-cke-' + CKEDITOR.rnd + '-' + fullAttr;

				return fullAttr;
			} ) + '>';
		} );
	}

	function protectElements( html, regex ) {
		return html.replace( regex, function( match, tag, content ) {
			// Encode < and > in textarea because this won't be done by a browser, since
			// textarea will be protected during passing data through fix bin.
			if ( match.indexOf( '<textarea' ) === 0 )
				match = tag + unprotectRealComments( content ).replace( /</g, '&lt;' ).replace( />/g, '&gt;' ) + '</textarea>';

			return '<cke:encoded>' + encodeURIComponent( match ) + '</cke:encoded>';
		} );
	}

	function unprotectElements( html ) {
		return html.replace( encodedElementsRegex, function( match, encoded ) {
			return decodeURIComponent( encoded );
		} );
	}

	function protectElementsNames( html ) {
		return html.replace( protectElementNamesRegex, '$1cke:$2' );
	}

	function unprotectElementNames( html ) {
		return html.replace( unprotectElementNamesRegex, '$1$2' );
	}

	function protectSelfClosingElements( html ) {
		return html.replace( protectSelfClosingRegex, '<cke:$1$2></cke:$1>' );
	}

	function protectPreFormatted( html ) {
		return html.replace( /(<pre\b[^>]*>)(\r\n|\n)/g, '$1$2$2' );
	}

	function protectRealComments( html ) {
		return html.replace( /<!--(?!{cke_protected})[\s\S]+?-->/g, function( match ) {
			return '<!--' + protectedSourceMarker +
				'{C}' +
				encodeURIComponent( match ).replace( /--/g, '%2D%2D' ) +
				'-->';
		} );
	}

	// Produces regex matching reserved `cke:encoded` element for valid HTML symbol codes.
	// Matches `cke:encoded` element in hexadecimal, HTML-code, or HTML-entity.
	function createReservedElementsRegex() {
		return new RegExp( '(' +
			// Create closed element regex i.e `<cke:encoded>xxx</cke:encoded>`.
			createEncodedRegex( '<cke:encoded>' ) +
			'(.*?)' +
			createEncodedRegex( '</cke:encoded>' ) +
			')|(' +
			// Create unclosed element regex i.e `<cke:encoded>xxx` or `xxx</cke:encoded>` to make sure that
			// element won't be closed by HTML parser and matched by `unprotectElements` function.
			createEncodedRegex( '<' ) +
			createEncodedRegex( '/' ) + '?' +
			createEncodedRegex( 'cke:encoded>' ) +
			')', 'gi' );
	}

	function createEncodedRegex( str ) {
		return CKEDITOR.tools.array.reduce( str.split( '' ), function( cur, character ) {
			// Produce case insensitive regex. `i` flag is not enough thus code entities differs
			// depending on case sensitivity.
			var lowerCase = character.toLowerCase(),
				upperCase = character.toUpperCase(),
				regex = createCharacterEncodedRegex( lowerCase );

			if ( lowerCase !== upperCase ) {
				regex += '|' + createCharacterEncodedRegex( upperCase );
			}

			cur += '(' + regex + ')';

			return cur;
		}, '' );
	}

	function createCharacterEncodedRegex( character ) {
		var map = getCharRegexMap( character ),
			charRegex = character;

		for ( var code in map ) {
			if ( map[ code ] ) {
				charRegex += '|' + map[ code ];
			}
		}

		return charRegex;
	}

	function getCharRegexMap( character ) {
		var entities = {
				'<': '&lt;',
				'>': '&gt;',
				':': '&colon;'
			},
			charCode = character.charCodeAt( 0 ),
			hex = charCode.toString( 16 );

		return {
			// `;` is optional and HTML parser is able to recognize codes without it.
			htmlCode: '&#' + charCode + ';?',
			// Hexadecimal value is valid despite leading zero padding e.g. `&#x0065` === `&#x65`.
			hex: '&#x0*' + hex + ';?',
			entity: entities[ character ]
		};
	}

	// Replace all "on\w{3,}" strings which are not:
	// * opening tags - e.g. `<onfoo`,
	// * closing tags - e.g. </onfoo> (tested in "false positive 1"),
	// * part of other attribute - e.g. `data-onfoo` or `fonfoo`.
	function protectInsecureAttributes( html ) {
		return html.replace( /([^a-z0-9<\-])(on\w{3,})(?!>)/gi, '$1data-cke-' + CKEDITOR.rnd + '-$2' );
	}

	function unprotectRealComments( html ) {
		return html.replace( /<!--\{cke_protected\}\{C\}([\s\S]+?)-->/g, function( match, data ) {
			return decodeURIComponent( data );
		} );
	}

	function unprotectSource( html, editor ) {
		var store = editor._.dataStore;

		return html.replace( /<!--\{cke_protected\}([\s\S]+?)-->/g, function( match, data ) {
			return decodeURIComponent( data );
		} ).replace( /\{cke_protected_(\d+)\}/g, function( match, id ) {
			return store && store[ id ] || '';
		} );
	}

	function protectSource( data, editor ) {
		var protectedHtml = [],
			protectRegexes = editor.config.protectedSource,
			store = editor._.dataStore || ( editor._.dataStore = { id: 1 } ),
			tempRegex = /<\!--\{cke_temp(comment)?\}(\d*?)-->/g;

		var regexes = [
			// Script tags will also be forced to be protected, otherwise
			// IE will execute them.
			( /<script[\s\S]*?(<\/script>|$)/gi ),

			// <noscript> tags (get lost in IE and messed up in FF).
			/<noscript[\s\S]*?<\/noscript>/gi,

			// Avoid meta tags being stripped (https://dev.ckeditor.com/ticket/8117).
			/<meta[\s\S]*?\/?>/gi
		].concat( protectRegexes );

		// First of any other protection, we must protect all comments
		// to avoid loosing them (of course, IE related).
		// Note that we use a different tag for comments, as we need to
		// transform them when applying filters.
		data = data.replace( ( /<!--[\s\S]*?-->/g ), function( match ) {
			return '<!--{cke_tempcomment}' + ( protectedHtml.push( match ) - 1 ) + '-->';
		} );

		for ( var i = 0; i < regexes.length; i++ ) {
			data = data.replace( regexes[ i ], function( match ) {
				match = match.replace( tempRegex, // There could be protected source inside another one. (https://dev.ckeditor.com/ticket/3869).
				function( $, isComment, id ) {
					return protectedHtml[ id ];
				} );

				// Avoid protecting over protected, e.g. /\{.*?\}/
				return ( /cke_temp(comment)?/ ).test( match ) ? match : '<!--{cke_temp}' + ( protectedHtml.push( match ) - 1 ) + '-->';
			} );
		}
		data = data.replace( tempRegex, function( $, isComment, id ) {
			return '<!--' + protectedSourceMarker +
				( isComment ? '{C}' : '' ) +
				encodeURIComponent( protectedHtml[ id ] ).replace( /--/g, '%2D%2D' ) +
				'-->';
		} );

		// Different protection pattern is used for those that
		// live in attributes to avoid from being HTML encoded.
		// Why so serious? See https://dev.ckeditor.com/ticket/9205, https://dev.ckeditor.com/ticket/8216, https://dev.ckeditor.com/ticket/7805,
		// https://dev.ckeditor.com/ticket/11754, https://dev.ckeditor.com/ticket/11846.
		data = data.replace( /<\w+(?:\s+(?:(?:[^\s=>]+\s*=\s*(?:[^'"\s>]+|'[^']*'|"[^"]*"))|[^\s=\/>]+))+\s*\/?>/g, function( match ) {
			return match.replace( /<!--\{cke_protected\}([^>]*)-->/g, function( match, data ) {
				store[ store.id ] = decodeURIComponent( data );
				return '{cke_protected_' + ( store.id++ ) + '}';
			} );
		} );

		// This RegExp searches for innerText in all the title/iframe/textarea elements.
		// This is because browser doesn't allow HTML in these elements, that's why we can't
		// nest comments in there. (https://dev.ckeditor.com/ticket/11223)
		data = data.replace( /<(title|iframe|textarea)([^>]*)>([\s\S]*?)<\/\1>/g, function( match, tagName, tagAttributes, innerText ) {
			return '<' + tagName + tagAttributes + '>' + unprotectSource( unprotectRealComments( innerText ), editor ) + '</' + tagName + '>';
		} );

		return data;
	}

	// Creates a block if the root element is empty.
	function fixEmptyRoot( root, fixBodyTag ) {
		if ( !root.children.length && CKEDITOR.dtd[ root.name ][ fixBodyTag ] ) {
			var fixBodyElement = new CKEDITOR.htmlParser.element( fixBodyTag );
			root.add( fixBodyElement );
		}
	}
} )();

/**
 * Whether a filler text (non-breaking space entity &mdash; `&nbsp;`) will be
 * inserted into empty block elements in HTML output.
 * This is used to render block elements properly with `line-height`.
 * When a function is specified instead, it will be passed a {@link CKEDITOR.htmlParser.element}
 * to decide whether adding the filler text by expecting a Boolean return value.
 *
 *		config.fillEmptyBlocks = false; // Prevent filler nodes in all empty blocks.
 *
 *		// Prevent filler node only in float cleaners.
 *		config.fillEmptyBlocks = function( element ) {
 *			if ( element.attributes[ 'class' ].indexOf( 'clear-both' ) != -1 )
 *				return false;
 *		};
 *
 * @since 3.5.0
 * @cfg {Boolean/Function} [fillEmptyBlocks=true]
 * @member CKEDITOR.config
 */

/**
 * This event is fired by the {@link CKEDITOR.htmlDataProcessor} when input HTML
 * is to be purified by the {@link CKEDITOR.htmlDataProcessor#toHtml} method.
 *
 * By adding listeners with different priorities it is possible
 * to process input HTML on different stages:
 *
 *	* 1-4: Data is available in the original string format.
 *	* 5: Data is initially filtered with regexp patterns and parsed to
 *		{@link CKEDITOR.htmlParser.fragment} {@link CKEDITOR.htmlParser.element}.
 *	* 5-9: Data is available in the parsed format, but {@link CKEDITOR.htmlDataProcessor#dataFilter}
 *		is not applied yet.
 *	* 6: Data is filtered with the {@link CKEDITOR.filter content filter}.
 *	* 10: Data is processed with {@link CKEDITOR.htmlDataProcessor#dataFilter}.
 *	* 10-14: Data is available in the parsed format and {@link CKEDITOR.htmlDataProcessor#dataFilter}
 *		has already been applied.
 *	* 15: Data is written back to an HTML string.
 *	* 15-*: Data is available in an HTML string.
 *
 * For example to be able to process parsed, but not yet filtered data add listener this way:
 *
 *		editor.on( 'toHtml', function( evt) {
 *			evt.data.dataValue; // -> CKEDITOR.htmlParser.fragment instance
 *		}, null, null, 7 );
 *
 * @since 4.1.0
 * @event toHtml
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param data
 * @param {String/CKEDITOR.htmlParser.fragment/CKEDITOR.htmlParser.element} data.dataValue Input data to be purified.
 * @param {String} data.context See {@link CKEDITOR.htmlDataProcessor#toHtml} The `context` argument.
 * @param {Boolean} data.fixForBody See {@link CKEDITOR.htmlDataProcessor#toHtml} The `fixForBody` argument.
 * @param {Boolean} data.dontFilter See {@link CKEDITOR.htmlDataProcessor#toHtml} The `dontFilter` argument.
 * @param {Boolean} data.filter See {@link CKEDITOR.htmlDataProcessor#toHtml} The `filter` argument.
 * @param {Boolean} data.enterMode See {@link CKEDITOR.htmlDataProcessor#toHtml} The `enterMode` argument.
 * @param {Boolean} [data.protectedWhitespaces] See {@link CKEDITOR.htmlDataProcessor#toHtml} The `protectedWhitespaces` argument.
 */

/**
 * This event is fired when {@link CKEDITOR.htmlDataProcessor} is converting
 * internal HTML to output data HTML.
 *
 * By adding listeners with different priorities it is possible
 * to process input HTML on different stages:
 *
 *	* 1-4: Data is available in the original string format.
 *	* 5: Data is initially filtered with regexp patterns and parsed to
 *		{@link CKEDITOR.htmlParser.fragment} {@link CKEDITOR.htmlParser.element}.
 *	* 5-9: Data is available in the parsed format, but {@link CKEDITOR.htmlDataProcessor#htmlFilter}
 *		is not applied yet.
 *	* 10: Data is filtered with {@link CKEDITOR.htmlDataProcessor#htmlFilter}.
 *  * 11: Data is filtered with the {CKEDITOR.filter content filter} (on output the content filter makes
 *		only transformations, without filtering).
 *	* 10-14: Data is available in the parsed format and {@link CKEDITOR.htmlDataProcessor#htmlFilter}
 *		has already been applied.
 *	* 15: Data is written back to an HTML string.
 *	* 15-*: Data is available in an HTML string.
 *
 * For example to be able to process parsed and already processed data add listener this way:
 *
 *		editor.on( 'toDataFormat', function( evt) {
 *			evt.data.dataValue; // -> CKEDITOR.htmlParser.fragment instance
 *		}, null, null, 12 );
 *
 * @since 4.1.0
 * @event toDataFormat
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param data
 * @param {String/CKEDITOR.htmlParser.fragment/CKEDITOR.htmlParser.element} data.dataValue Output data to be prepared.
 * @param {String} data.context See {@link CKEDITOR.htmlDataProcessor#toDataFormat} The `context` argument.
 * @param {Boolean} data.filter See {@link CKEDITOR.htmlDataProcessor#toDataFormat} The `filter` argument.
 * @param {Boolean} data.enterMode See {@link CKEDITOR.htmlDataProcessor#toDataFormat} The `enterMode` argument.
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

'use strict';

/**
 * A lightweight representation of an HTML element.
 *
 * @class
 * @extends CKEDITOR.htmlParser.node
 * @constructor Creates an element class instance.
 * @param {String} name The element name.
 * @param {Object} attributes An object storing all attributes defined for
 * this element.
 */
CKEDITOR.htmlParser.element = function( name, attributes ) {
	/**
	 * The element name.
	 *
	 * @property {String}
	 */
	this.name = name;

	/**
	 * Stores the attributes defined for this element.
	 *
	 * @property {Object}
	 */
	this.attributes = attributes || {};

	/**
	 * The nodes that are direct children of this element.
	 */
	this.children = [];

	// Reveal the real semantic of our internal custom tag name (https://dev.ckeditor.com/ticket/6639),
	// when resolving whether it's block like.
	var realName = name || '',
		prefixed = realName.match( /^cke:(.*)/ );
	prefixed && ( realName = prefixed[ 1 ] );

	var isBlockLike = !!( CKEDITOR.dtd.$nonBodyContent[ realName ] || CKEDITOR.dtd.$block[ realName ] ||
		CKEDITOR.dtd.$listItem[ realName ] || CKEDITOR.dtd.$tableContent[ realName ] ||
		CKEDITOR.dtd.$nonEditable[ realName ] || realName == 'br' );

	this.isEmpty = !!CKEDITOR.dtd.$empty[ name ];
	this.isUnknown = !CKEDITOR.dtd[ name ];

	/** @private */
	this._ = {
		isBlockLike: isBlockLike,
		hasInlineStarted: this.isEmpty || !isBlockLike
	};
};

/**
 * Object presentation of the CSS style declaration text.
 *
 * @class
 * @constructor Creates a `cssStyle` class instance.
 * @param {CKEDITOR.htmlParser.element/String} elementOrStyleText
 * An HTML parser element or the inline style text.
 */
CKEDITOR.htmlParser.cssStyle = function() {
	var styleText,
		arg = arguments[ 0 ],
		rules = {};

	styleText = arg instanceof CKEDITOR.htmlParser.element ? arg.attributes.style : arg;

	// html-encoded quote might be introduced by 'font-family'
	// from MS-Word which confused the following regexp. e.g.
	//'font-family: &quot;Lucida, Console&quot;'
	// TODO reuse CSS methods from tools.
	( styleText || '' ).replace( /&quot;/g, '"' ).replace( /\s*([^ :;]+)\s*:\s*([^;]+)\s*(?=;|$)/g, function( match, name, value ) {
		name == 'font-family' && ( value = value.replace( /["']/g, '' ) );
		rules[ name.toLowerCase() ] = value;
	} );

	return {

		rules: rules,

		/**
		 * Applies the styles to the specified element or object.
		 *
		 * @param {CKEDITOR.htmlParser.element/CKEDITOR.dom.element/Object} obj
		 */
		populate: function( obj ) {
			var style = this.toString();
			if ( style )
				obj instanceof CKEDITOR.dom.element ? obj.setAttribute( 'style', style ) : obj instanceof CKEDITOR.htmlParser.element ? obj.attributes.style = style : obj.style = style;

		},

		/**
		 * Serializes CSS style declaration to a string.
		 *
		 * @returns {String}
		 */
		toString: function() {
			var output = [];
			for ( var i in rules )
				rules[ i ] && output.push( i, ':', rules[ i ], ';' );
			return output.join( '' );
		}
	};
};

/** @class CKEDITOR.htmlParser.element */
( function() {
	// Used to sort attribute entries in an array, where the first element of
	// each object is the attribute name.
	var sortAttribs = function( a, b ) {
			a = a[ 0 ];
			b = b[ 0 ];
			return a < b ? -1 : a > b ? 1 : 0;
		},
		fragProto = CKEDITOR.htmlParser.fragment.prototype;

	CKEDITOR.htmlParser.element.prototype = CKEDITOR.tools.extend( new CKEDITOR.htmlParser.node(), {
		/**
		 * The node type. This is a constant value set to {@link CKEDITOR#NODE_ELEMENT}.
		 *
		 * @readonly
		 * @property {Number} [=CKEDITOR.NODE_ELEMENT]
		 */
		type: CKEDITOR.NODE_ELEMENT,

		/**
		 * Adds a node to the element children list.
		 *
		 * @method
		 * @param {CKEDITOR.htmlParser.node} node The node to be added.
		 * @param {Number} [index] From where the insertion happens.
		 */
		add: fragProto.add,

		/**
		 * Clones this element.
		 *
		 * @returns {CKEDITOR.htmlParser.element} The element clone.
		 */
		clone: function() {
			return new CKEDITOR.htmlParser.element( this.name, this.attributes );
		},

		/**
		 * Filters this element and its children with the given filter.
		 *
		 * @since 4.1.0
		 * @param {CKEDITOR.htmlParser.filter} filter
		 * @returns {Boolean} The method returns `false` when this element has
		 * been removed or replaced with another. This information means that
		 * {@link #filterChildren} has to repeat the filter on the current
		 * position in parent's children array.
		 */
		filter: function( filter, context ) {
			var element = this,
				originalName, name;

			context = element.getFilterContext( context );

			// Filtering if it's the root node.
			if ( !element.parent )
				filter.onRoot( context, element );

			while ( true ) {
				originalName = element.name;

				if ( !( name = filter.onElementName( context, originalName ) ) ) {
					this.remove();
					return false;
				}

				element.name = name;

				if ( !( element = filter.onElement( context, element ) ) ) {
					this.remove();
					return false;
				}

				// New element has been returned - replace current one
				// and process it (stop processing this and return false, what
				// means that element has been removed).
				if ( element !== this ) {
					this.replaceWith( element );
					return false;
				}

				// If name has been changed - continue loop, so in next iteration
				// filters for new name will be applied to this element.
				// If name hasn't been changed - stop.
				if ( element.name == originalName )
					break;

				// If element has been replaced with something of a
				// different type, then make the replacement filter itself.
				if ( element.type != CKEDITOR.NODE_ELEMENT ) {
					this.replaceWith( element );
					return false;
				}

				// This indicate that the element has been dropped by
				// filter but not the children.
				if ( !element.name ) {
					this.replaceWithChildren();
					return false;
				}
			}

			var attributes = element.attributes,
				a, value, newAttrName;

			for ( a in attributes ) {
				newAttrName = a;
				value = attributes[ a ];

				// Loop until name isn't modified.
				// A little bit senseless, but IE would do that anyway
				// because it iterates with for-in loop even over properties
				// created during its run.
				while ( true ) {
					if ( !( newAttrName = filter.onAttributeName( context, a ) ) ) {
						delete attributes[ a ];
						break;
					} else if ( newAttrName != a ) {
						delete attributes[ a ];
						a = newAttrName;
						continue;
					} else {
						break;
					}
				}

				if ( newAttrName ) {
					if ( ( value = filter.onAttribute( context, element, newAttrName, value ) ) === false )
						delete attributes[ newAttrName ];
					else
						attributes[ newAttrName ] = value;
				}
			}

			if ( !element.isEmpty )
				this.filterChildren( filter, false, context );

			return true;
		},

		/**
		 * Filters this element's children with the given filter.
		 *
		 * Element's children may only be filtered once by one
		 * instance of the filter.
		 *
		 * @method filterChildren
		 * @param {CKEDITOR.htmlParser.filter} filter
		 */
		filterChildren: fragProto.filterChildren,

		/**
		 * Writes the element HTML to the CKEDITOR.htmlWriter.
		 *
		 * @param {CKEDITOR.htmlParser.basicWriter} writer The writer to which HTML will be written.
		 * @param {CKEDITOR.htmlParser.filter} [filter] The filter to be applied to this node.
		 * **Note:** It is unsafe to filter an offline (not appended) node.
		 */
		writeHtml: function( writer, filter ) {
			if ( filter )
				this.filter( filter );

			var name = this.name,
				attribsArray = [],
				attributes = this.attributes,
				attrName,
				attr, i, l;

			// Open element tag.
			writer.openTag( name, attributes );

			// Copy all attributes to an array.
			for ( attrName in attributes )
				attribsArray.push( [ attrName, attributes[ attrName ] ] );

			// Sort the attributes by name.
			if ( writer.sortAttributes )
				attribsArray.sort( sortAttribs );

			// Send the attributes.
			for ( i = 0, l = attribsArray.length; i < l; i++ ) {
				attr = attribsArray[ i ];
				writer.attribute( attr[ 0 ], attr[ 1 ] );
			}

			// Close the tag.
			writer.openTagClose( name, this.isEmpty );

			this.writeChildrenHtml( writer );

			// Close the element.
			if ( !this.isEmpty )
				writer.closeTag( name );
		},

		/**
		 * Sends children of this element to the writer.
		 *
		 * @param {CKEDITOR.htmlParser.basicWriter} writer The writer to which HTML will be written.
		 * @param {CKEDITOR.htmlParser.filter} [filter]
		 */
		writeChildrenHtml: fragProto.writeChildrenHtml,

		/**
		 * Replaces this element with its children.
		 *
		 * @since 4.1.0
		 */
		replaceWithChildren: function() {
			var children = this.children;

			for ( var i = children.length; i; )
				children[ --i ].insertAfter( this );

			this.remove();
		},

		/**
		 * Executes a callback on each node (of the given type) in this element.
		 *
		 *		// Create a <p> element with foo<b>bar</b>bom as its content.
		 *		var elP = CKEDITOR.htmlParser.fragment.fromHtml( 'foo<b>bar</b>bom', 'p' );
		 *		elP.forEach( function( node ) {
		 *			console.log( node );
		 *		} );
		 *		// Will log:
		 *		// 1. document fragment,
		 *		// 2. <p> element,
		 *		// 3. "foo" text node,
		 *		// 4. <b> element,
		 *		// 5. "bar" text node,
		 *		// 6. "bom" text node.
		 *
		 * @since 4.1.0
		 * @param {Function} callback Function to be executed on every node.
		 * **Since 4.3**: If `callback` returned `false`, the descendants of the current node will be ignored.
		 * @param {CKEDITOR.htmlParser.node} callback.node Node passed as an argument.
		 * @param {Number} [type] Whether the specified `callback` will be executed only on nodes of this type.
		 * @param {Boolean} [skipRoot] Do not execute `callback` on this element.
		 */
		forEach: fragProto.forEach,

		/**
		 * Gets this element's first child. If `condition` is given, this method returns
		 * the first child which satisfies that condition.
		 *
		 * @since 4.3.0
		 * @param {String/Object/Function} condition Name of a child, a hash of names, or a validator function.
		 * @returns {CKEDITOR.htmlParser.node}
		 */
		getFirst: function( condition ) {
			if ( !condition )
				return this.children.length ? this.children[ 0 ] : null;

			if ( typeof condition != 'function' )
				condition = nameCondition( condition );

			for ( var i = 0, l = this.children.length; i < l; ++i ) {
				if ( condition( this.children[ i ] ) )
					return this.children[ i ];
			}
			return null;
		},

		/**
		 * Gets this element's inner HTML.
		 *
		 * @since 4.3.0
		 * @returns {String}
		 */
		getHtml: function() {
			var writer = new CKEDITOR.htmlParser.basicWriter();
			this.writeChildrenHtml( writer );
			return writer.getHtml();
		},

		/**
		 * Sets this element's inner HTML.
		 *
		 * @since 4.3.0
		 * @param {String} html
		 */
		setHtml: function( html ) {
			var children = this.children = CKEDITOR.htmlParser.fragment.fromHtml( html ).children;

			for ( var i = 0, l = children.length; i < l; ++i )
				children[ i ].parent = this;
		},

		/**
		 * Gets this element's outer HTML.
		 *
		 * @since 4.3.0
		 * @returns {String}
		 */
		getOuterHtml: function() {
			var writer = new CKEDITOR.htmlParser.basicWriter();
			this.writeHtml( writer );
			return writer.getHtml();
		},

		/**
		 * Splits this element at the given index.
		 *
		 * @since 4.3.0
		 * @param {Number} index Index at which the element will be split &mdash; `0` means the beginning,
		 * `1` after the first child node, etc.
		 * @returns {CKEDITOR.htmlParser.element} The new element following this one.
		 */
		split: function( index ) {
			var cloneChildren = this.children.splice( index, this.children.length - index ),
				clone = this.clone();

			for ( var i = 0; i < cloneChildren.length; ++i )
				cloneChildren[ i ].parent = clone;

			clone.children = cloneChildren;

			if ( cloneChildren[ 0 ] )
				cloneChildren[ 0 ].previous = null;

			if ( index > 0 )
				this.children[ index - 1 ].next = null;

			this.parent.add( clone, this.getIndex() + 1 );

			return clone;
		},

		/**
		 * Searches through the current node children to find nodes matching the `criteria`.
		 *
		 * @param {String/Function} criteria Tag name or evaluator function.
		 * @param {Boolean} [recursive=false]
		 * @returns {CKEDITOR.htmlParser.node[]}
		 */
		find: function( criteria, recursive ) {
			if ( recursive === undefined ) {
				recursive = false;
			}

			var ret = [],
				i;

			for	( i = 0; i < this.children.length; i++ ) {
				var curChild = this.children[ i ];

				if ( typeof criteria == 'function' && criteria( curChild ) ) {
					ret.push( curChild );
				} else if ( typeof criteria == 'string' && curChild.name === criteria ) {
					ret.push( curChild );
				}

				if ( recursive && curChild.find ) {
					ret = ret.concat( curChild.find( criteria, recursive ) );
				}
			}

			return ret;
		},

		/**
		 * Searches through the children of the current element to find the first child matching the `criteria`.
		 *
		 * ```js
		 * element.findOne( function( child ) {
		 *     return child.name === 'span' || child.name === 'strong';
		 * } ); // Will return the first child which is a <span> or a <strong> element.
		 * ```
		 *
		 * @param {String/Function} criteria Tag name or evaluator function.
		 * @param {Boolean} [recursive=false] If set to `true`, it will iterate over all descendants. Otherwise the method will
		 * only iterate over direct children.
		 * @returns {CKEDITOR.htmlParser.node/null} The first matched child, `null` otherwise.
		 */
		findOne: function( criteria, recursive ) {
			var nestedMatch = null,
				match = CKEDITOR.tools.array.find( this.children, function( child ) {
					var isMatching = typeof criteria === 'function' ? criteria( child ) : child.name === criteria;

					if ( isMatching || !recursive ) {
						return isMatching;
					}

					if ( child.children && child.findOne ) {
						nestedMatch = child.findOne( criteria, true );
					}

					return !!nestedMatch;
				} );

			return nestedMatch || match || null;
		},

		/**
		 * Adds a class name to the list of classes.
		 *
		 * @since 4.4.0
		 * @param {String} className The class name to be added.
		 */
		addClass: function( className ) {
			if ( this.hasClass( className ) )
				return;

			var c = this.attributes[ 'class' ] || '';

			this.attributes[ 'class' ] = c + ( c ? ' ' : '' ) + className;
		},

		/**
		 * Removes a class name from the list of classes.
		 *
		 * @since 4.3.0
		 * @param {String} className The class name to be removed.
		 */
		removeClass: function( className ) {
			var classes = this.attributes[ 'class' ];

			if ( !classes )
				return;

			// We can safely assume that className won't break regexp.
			// http://stackoverflow.com/questions/448981/what-characters-are-valid-in-css-class-names
			classes = CKEDITOR.tools.trim( classes.replace( new RegExp( '(?:\\s+|^)' + className + '(?:\\s+|$)' ), ' ' ) );

			if ( classes )
				this.attributes[ 'class' ] = classes;
			else
				delete this.attributes[ 'class' ];
		},

		/**
		 * Checkes whether this element has a class name.
		 *
		 * @since 4.3.0
		 * @param {String} className The class name to be checked.
		 * @returns {Boolean} Whether this element has a `className`.
		 */
		hasClass: function( className ) {
			var classes = this.attributes[ 'class' ];

			if ( !classes )
				return false;

			return ( new RegExp( '(?:^|\\s)' + className + '(?=\\s|$)' ) ).test( classes );
		},

		getFilterContext: function( ctx ) {
			var changes = [];

			if ( !ctx ) {
				ctx = {
					nonEditable: false,
					nestedEditable: false
				};
			}

			if ( !ctx.nonEditable && this.attributes.contenteditable == 'false' )
				changes.push( 'nonEditable', true );
			// A context to be given nestedEditable must be nonEditable first (by inheritance) (https://dev.ckeditor.com/ticket/11372, https://dev.ckeditor.com/ticket/11698).
			// Special case: https://dev.ckeditor.com/ticket/11504 - filter starts on <body contenteditable=true>,
			// so ctx.nonEditable has not been yet set to true.
			else if ( ctx.nonEditable && !ctx.nestedEditable && this.attributes.contenteditable == 'true' )
				changes.push( 'nestedEditable', true );

			if ( changes.length ) {
				ctx = CKEDITOR.tools.copy( ctx );
				for ( var i = 0; i < changes.length; i += 2 )
					ctx[ changes[ i ] ] = changes[ i + 1 ];
			}

			return ctx;
		}
	}, true );

	function nameCondition( condition ) {
		return function( el ) {
			return el.type == CKEDITOR.NODE_ELEMENT &&
				( typeof condition == 'string' ? el.name == condition : el.name in condition );
		};
	}
} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Defines the {@link CKEDITOR.template} class, which represents
 * an UI template for an editor instance.
 */

( function() {
	var rePlaceholder = /{([^}]+)}/g;

	/**
	 * Lightweight template used to build the output string from variables.
	 *
	 *		// HTML template for presenting a label UI.
	 *		var tpl = new CKEDITOR.template( '<div class="{cls}">{label}</div>' );
	 *		alert( tpl.output( { cls: 'cke-label', label: 'foo'} ) ); // '<div class="cke-label">foo</div>'
	 *
	 *		// Since 4.12.0 it is possible to pass a callback function that returns a template.
	 *		var tpl2 = new CKEDITOR.template( function( data ) {
	 *			return data.image ? '<img src="{image}" alt="{label}"/>' : '{label}';
	 *		} );
	 *		alert( tpl2.output( { image: null, label: 'foo'} ) ); // 'foo'
	 *		alert( tpl2.output( { image: '/some-image.jpg', label: 'foo'} ) ); // <img src="/some-image.jpg" alt="foo"/>
	 *
	 * @class
	 * @constructor Creates a template class instance.
	 * @param {String/Function} source A string with the template source or a callback that will return such string.
	 * The handling of the `Function` type was added in version 4.12.0 .
	 */
	CKEDITOR.template = function( source ) {
		/**
		 * The current template source.
		 *
		 * Note that support for the `Function` type was added in version 4.12.0 .
		 *
		 * @readonly
		 * @member CKEDITOR.template
		 * @property {String/Function} source
		 */
		this.source = typeof source === 'function' ? source : String( source );
	};

	/**
	 * Processes the template, filling its variables with the provided data.
	 *
	 * @method
	 * @member CKEDITOR.template
	 * @param {Object} data An object containing properties whose values will be
	 * used to fill the template variables. The property names must match the
	 * template variables names. Variables without matching properties will be
	 * kept untouched.
	 * @param {Array} [buffer] An array that the output data will be pushed into.
	 * The number of entries appended to the array is unknown.
	 * @returns {String/Number} If `buffer` has not been provided, the processed
	 * template output data; otherwise the new length of `buffer`.
	 */
	CKEDITOR.template.prototype.output = function( data, buffer ) {

		var template = typeof this.source === 'function' ? this.source( data ) : this.source,
			output = template.replace( rePlaceholder, function( fullMatch, dataKey ) {
				return data[ dataKey ] !== undefined ? data[ dataKey ] : fullMatch;
			} );

		return buffer ? buffer.push( output ) : output;
	};
} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Contains the third and last part of the {@link CKEDITOR} object
 *		definition.
 */

/** @class CKEDITOR */

// Remove the CKEDITOR.loadFullCore reference defined on ckeditor_basic.
delete CKEDITOR.loadFullCore;

/**
 * Stores references to all editor instances created. The name of the properties
 * in this object correspond to instance names, and their values contain the
 * {@link CKEDITOR.editor} object representing them.
 *
 *		alert( CKEDITOR.instances.editor1.name ); // 'editor1'
 *
 * @property {Object}
 */
CKEDITOR.instances = {};

/**
 * The document of the window storing the CKEDITOR object.
 *
 *		alert( CKEDITOR.document.getBody().getName() ); // 'body'
 *
 * @property {CKEDITOR.dom.document}
 */
CKEDITOR.document = new CKEDITOR.dom.document( document );

/**
 * Adds an editor instance to the global {@link CKEDITOR} object. This function
 * is available for internal use mainly.
 *
 * @param {CKEDITOR.editor} editor The editor instance to be added.
 */
CKEDITOR.add = function( editor ) {
	CKEDITOR.instances[ editor.name ] = editor;

	editor.on( 'focus', function() {
		if ( CKEDITOR.currentInstance != editor ) {
			CKEDITOR.currentInstance = editor;
			CKEDITOR.fire( 'currentInstance' );
		}
	} );

	editor.on( 'blur', removeInstance );

	// Remove currentInstance if it's destroyed (#589).
	editor.on( 'destroy', removeInstance );

	CKEDITOR.fire( 'instance', null, editor );

	function removeInstance() {
		if ( CKEDITOR.currentInstance == editor ) {
			CKEDITOR.currentInstance = null;
			CKEDITOR.fire( 'currentInstance' );
		}
	}
};

/**
 * Removes an editor instance from the global {@link CKEDITOR} object. This function
 * is available for internal use only. External code must use {@link CKEDITOR.editor#method-destroy}.
 *
 * @private
 * @param {CKEDITOR.editor} editor The editor instance to be removed.
 */
CKEDITOR.remove = function( editor ) {
	delete CKEDITOR.instances[ editor.name ];
};

( function() {
	var tpls = {};

	/**
	 * Adds a named {@link CKEDITOR.template} instance to be reused among all editors.
	 * This will return the existing one if a template with same name is already
	 * defined. Additionally, it fires the "template" event to allow template source customization.
	 *
	 * @param {String} name The name which identifies a UI template.
	 * @param {String} source The source string for constructing this template.
	 * @returns {CKEDITOR.template} The created template instance.
	 */
	CKEDITOR.addTemplate = function( name, source ) {
		var tpl = tpls[ name ];
		if ( tpl )
			return tpl;

		// Make it possible to customize the template through event.
		var params = { name: name, source: source };
		CKEDITOR.fire( 'template', params );

		return ( tpls[ name ] = new CKEDITOR.template( params.source ) );
	};

	/**
	 * Retrieves a defined template created with {@link CKEDITOR#addTemplate}.
	 *
	 * @param {String} name The template name.
	 */
	CKEDITOR.getTemplate = function( name ) {
		return tpls[ name ];
	};
} )();

( function() {
	var styles = [];

	/**
	 * Adds CSS rules to be appended to the editor document.
	 * This method is mostly used by plugins to add custom styles to the editor
	 * document. For basic content styling the `contents.css` file should be
	 * used instead.
	 *
	 * **Note:** This function should be called before the creation of editor instances.
	 *
	 *		// Add styles for all headings inside editable contents.
	 *		CKEDITOR.addCss( '.cke_editable h1,.cke_editable h2,.cke_editable h3 { border-bottom: 1px dotted red }' );
	 *
	 * @param {String} css The style rules to be appended.
	 * @see CKEDITOR.config#contentsCss
	 */
	CKEDITOR.addCss = function( css ) {
		styles.push( css );
	};

	/**
	 * Returns a string with all CSS rules passed to the {@link CKEDITOR#addCss} method.
	 *
	 * @returns {String} A string containing CSS rules.
	 */
	CKEDITOR.getCss = function() {
		return styles.join( '\n' );
	};
} )();

// Perform global clean up to free as much memory as possible
// when there are no instances left
CKEDITOR.on( 'instanceDestroyed', function() {
	if ( CKEDITOR.tools.isEmpty( this.instances ) )
		CKEDITOR.fire( 'reset' );
} );

// Load the bootstrap script.

// Tri-state constants.
/**
 * Used to indicate the ON or ACTIVE state.
 *
 * @readonly
 * @property {Number} [=1]
 */
CKEDITOR.TRISTATE_ON = 1;

/**
 * Used to indicate the OFF or INACTIVE state.
 *
 * @readonly
 * @property {Number} [=2]
 */
CKEDITOR.TRISTATE_OFF = 2;

/**
 * Used to indicate the DISABLED state.
 *
 * @readonly
 * @property {Number} [=0]
 */
CKEDITOR.TRISTATE_DISABLED = 0;

/**
 * The editor which is currently active (has user focus).
 *
 *		function showCurrentEditorName() {
 *			if ( CKEDITOR.currentInstance )
 *				alert( CKEDITOR.currentInstance.name );
 *			else
 *				alert( 'Please focus an editor first.' );
 *		}
 *
 * @property {CKEDITOR.editor} currentInstance
 * @see CKEDITOR#event-currentInstance
 */

/**
 * Fired when the CKEDITOR.currentInstance object reference changes. This may
 * happen when setting the focus on different editor instances in the page.
 *
 *		var editor; // A variable to store a reference to the current editor.
 *		CKEDITOR.on( 'currentInstance', function() {
 *			editor = CKEDITOR.currentInstance;
 *		} );
 *
 * @event currentInstance
 */

/**
 * Fired when the last instance has been destroyed. This event is used to perform
 * global memory cleanup.
 *
 * @event reset
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

( function() {
	/** @class CKEDITOR */

	/**
	 * Turns a DOM element with the `contenteditable` attribute set to `true` into a
	 * CKEditor instance. Check {@link CKEDITOR.dtd#$editable} for a list of
	 * allowed element names.
	 *
	 * **Note:** If the DOM element for which inline editing is being enabled does not have
	 * the `contenteditable` attribute set to `true`, the editor will start in read-only mode.
	 *
	 *		<div contenteditable="true" id="content">...</div>
	 *		...
	 *		CKEDITOR.inline( 'content' );
	 *
	 * It is also possible to create an inline editor from the `<textarea>` element.
	 * If you do so, an additional `<div>` element with editable content will be created
	 * directly after the `<textarea>` element and the `<textarea>` element will be hidden.
	 *
	 * @param {Object/String} element The DOM element or its ID.
	 * @param {Object} [instanceConfig] The specific configurations to apply to this editor instance.
	 * See {@link CKEDITOR.config}.
	 * @returns {CKEDITOR.editor} The editor instance created.
	 */
	CKEDITOR.inline = function( element, instanceConfig ) {
		element = CKEDITOR.editor._getEditorElement( element );

		if ( !element ) {
			return null;
		}

		var editor = new CKEDITOR.editor( instanceConfig, element, CKEDITOR.ELEMENT_MODE_INLINE ),
			textarea = element.is( 'textarea' ) ? element : null;

		if ( textarea ) {
			editor.setData( textarea.getValue(), null, true );

			//Change element from textarea to div
			element = CKEDITOR.dom.element.createFromHtml(
				'<div contenteditable="' + !!editor.readOnly + '" class="cke_textarea_inline">' +
					textarea.getValue() +
				'</div>',
				CKEDITOR.document );

			element.insertAfter( textarea );
			textarea.hide();

			// Attaching the concrete form.
			if ( textarea.$.form )
				editor._attachToForm();
		} else {
			// Initial editor data is simply loaded from the page element content to make
			// data retrieval possible immediately after the editor creation.
			editor.setData( element.getHtml(), null, true );
		}

		// Once the editor is loaded, start the UI.
		editor.on( 'loaded', function() {
			editor.fire( 'uiReady' );

			// Enable editing on the element.
			editor.editable( element );

			// Editable itself is the outermost element.
			editor.container = element;
			editor.ui.contentsElement = element;

			// Load and process editor data.
			editor.setData( editor.getData( 1 ) );

			// Clean on startup.
			editor.resetDirty();

			editor.fire( 'contentDom' );

			// Inline editing defaults to "wysiwyg" mode, so plugins don't
			// need to make special handling for this "mode-less" environment.
			editor.mode = 'wysiwyg';
			editor.fire( 'mode' );

			// The editor is completely loaded for interaction.
			editor.status = 'ready';
			editor.fireOnce( 'instanceReady' );
			CKEDITOR.fire( 'instanceReady', null, editor );

			// give priority to plugins that relay on editor#loaded for bootstrapping.
		}, null, null, 10000 );

		// Handle editor destroying.
		editor.on( 'destroy', function() {
			// Remove container from DOM if inline-textarea editor.
			// Show <textarea> back again.
			if ( textarea ) {
				editor.container.clearCustomData();
				editor.container.remove();
				textarea.show();
			}

			editor.element.clearCustomData();

			delete editor.element;
		} );

		return editor;
	};

	/**
	 * Calls {@link CKEDITOR#inline} for all page elements with
	 * the `contenteditable` attribute set to `true`.
	 *
	 */
	CKEDITOR.inlineAll = function() {
		var el, data;

		for ( var name in CKEDITOR.dtd.$editable ) {
			var elements = CKEDITOR.document.getElementsByTag( name );

			for ( var i = 0, len = elements.count(); i < len; i++ ) {
				el = elements.getItem( i );

				if ( el.getAttribute( 'contenteditable' ) == 'true' ) {
					// Fire the "inline" event, making it possible to customize
					// the instance settings and eventually cancel the creation.

					data = {
						element: el,
						config: {}
					};

					if ( CKEDITOR.fire( 'inline', data ) !== false )
						CKEDITOR.inline( el, data.config );
				}
			}
		}
	};

	CKEDITOR.domReady( function() {
		!CKEDITOR.disableAutoInline && CKEDITOR.inlineAll();
	} );
} )();

/**
 * Disables creating the inline editor automatically for elements with
 * the `contenteditable` attribute set to `true`.
 *
 *		CKEDITOR.disableAutoInline = true;
 *
 * @cfg {Boolean} [disableAutoInline=false]
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/** @class CKEDITOR */

/**
 * The class name used to identify `<textarea>` elements to be replaced
 * by CKEditor instances. Set it to empty/`null` to disable this feature.
 *
 *		CKEDITOR.replaceClass = 'rich_editor';
 *
 * @cfg {String} [replaceClass='ckeditor']
 */
CKEDITOR.replaceClass = 'ckeditor';

( function() {
	/**
	 * Replaces a `<textarea>` or a DOM element (`<div>`) with a CKEditor
	 * instance. For textareas, the initial value in the editor will be the
	 * textarea value. For DOM elements, their `innerHTML` will be used
	 * instead. It is recommended to use `<textarea>` and `<div>` elements only.
	 *
	 *		<textarea id="myfield" name="myfield"></textarea>
	 *		...
	 *		CKEDITOR.replace( 'myfield' );
	 *
	 *		var textarea = document.body.appendChild( document.createElement( 'textarea' ) );
	 *		CKEDITOR.replace( textarea );
	 *
	 * @param {Object/String} element The DOM element (textarea), its ID, or name.
	 * @param {Object} [config] The specific configuration to apply to this
	 * editor instance. Configuration set here will override the global CKEditor settings
	 * (see {@link CKEDITOR.config}).
	 * @returns {CKEDITOR.editor} The editor instance created.
	 */
	CKEDITOR.replace = function( element, config ) {
		return createInstance( element, config, null, CKEDITOR.ELEMENT_MODE_REPLACE );
	};

	/**
	 * Creates a new editor instance at the end of a specific DOM element.
	 *
	 *		<!DOCTYPE html>
	 * 		<html>
	 * 			<head>
	 * 				<meta charset="utf-8">
	 * 				<title>CKEditor</title>
	 * 				<!-- Make sure the path to CKEditor is correct. -->
	 *				<script src="/ckeditor/ckeditor.js"></script>
	 *			</head>
	 *			<body>
	 *				<div id="editorSpace"></div>
	 *				<script>
	 *					CKEDITOR.appendTo( 'editorSpace' );
	 *				</script>
	 *			</body>
	 *		</html>
	 *
	 * @param {Object/String} element The DOM element, its ID, or name.
	 * @param {Object} [config] The specific configuration to apply to this
	 * editor instance. Configuration set here will override the global CKEditor settings
	 * (see {@link CKEDITOR.config}).
	 * @param {String} [data] Since 3.3. Initial value for the instance.
	 * @returns {CKEDITOR.editor} The editor instance created.
	 */
	CKEDITOR.appendTo = function( element, config, data ) {
		return createInstance( element, config, data, CKEDITOR.ELEMENT_MODE_APPENDTO );
	};

	/**
	 * Replaces all `<textarea>` elements available in the document with
	 * editor instances.
	 *
	 *		// Replace all <textarea> elements in the page.
	 *		CKEDITOR.replaceAll();
	 *
	 *		// Replace all <textarea class="myClassName"> elements in the page.
	 *		CKEDITOR.replaceAll( 'myClassName' );
	 *
	 *		// Selectively replace <textarea> elements, based on a custom evaluation function.
	 *		CKEDITOR.replaceAll( function( textarea, config ) {
	 *			// A function that needs to be evaluated for the <textarea>
	 *			// to be replaced. It must explicitly return "false" to ignore a
	 *			// specific <textarea>.
	 *			// You can also customize the editor instance by having the function
	 *			// modify the "config" parameter.
	 *		} );
	 *
	 *		// Full page example where three <textarea> elements are replaced.
	 *		<!DOCTYPE html>
	 *		<html>
	 *			<head>
	 *				<meta charset="utf-8">
	 *				<title>CKEditor</title>
	 *				<!-- Make sure the path to CKEditor is correct. -->
	 *				<script src="/ckeditor/ckeditor.js"></script>
	 *			</head>
	 *			<body>
	 *				<textarea name="editor1"></textarea>
	 *				<textarea name="editor2"></textarea>
	 *				<textarea name="editor3"></textarea>
	 *				<script>
	 *					// Replace all three <textarea> elements above with CKEditor instances.
	 *					CKEDITOR.replaceAll();
	 *				</script>
	 *			</body>
	 *		</html>
	 *
	 * @param {String} [className] The `<textarea>` class name.
	 * @param {Function} [evaluator] An evaluation function that must return `true` for a `<textarea>`
	 * to be replaced with the editor. If the function returns `false`, the `<textarea>` element
	 * will not be replaced.
	 */
	CKEDITOR.replaceAll = function() {
		var textareas = document.getElementsByTagName( 'textarea' );

		for ( var i = 0; i < textareas.length; i++ ) {
			var config = null,
				textarea = textareas[ i ];

			// The "name" and/or "id" attribute must exist.
			if ( !textarea.name && !textarea.id )
				continue;

			if ( typeof arguments[ 0 ] == 'string' ) {
				// The textarea class name could be passed as the function
				// parameter.

				var classRegex = new RegExp( '(?:^|\\s)' + arguments[ 0 ] + '(?:$|\\s)' );

				if ( !classRegex.test( textarea.className ) )
					continue;
			} else if ( typeof arguments[ 0 ] == 'function' ) {
				// An evaluation function could be passed as the function parameter.
				// It must explicitly return "false" to ignore a specific <textarea>.
				config = {};
				if ( arguments[ 0 ]( textarea, config ) === false )
					continue;
			}

			this.replace( textarea, config );
		}
	};

	/** @class CKEDITOR.editor */

	/**
	 * Registers an editing mode. This function is to be used mainly by plugins.
	 *
	 * @param {String} mode The mode name.
	 * @param {Function} exec The function that performs the actual mode change.
	 */
	CKEDITOR.editor.prototype.addMode = function( mode, exec ) {
		( this._.modes || ( this._.modes = {} ) )[ mode ] = exec;
	};

	/**
	 * Changes the editing mode of this editor instance.
	 *
	 * **Note:** The mode switch could be asynchronous depending on the mode provider.
	 * Use the `callback` to hook subsequent code.
	 *
	 *		// Switch to "source" view.
	 *		CKEDITOR.instances.editor1.setMode( 'source' );
	 *		// Switch to "wysiwyg" view and be notified on completion.
	 *		CKEDITOR.instances.editor1.setMode( 'wysiwyg', function() { alert( 'wysiwyg mode loaded!' ); } );
	 *
	 * @param {String} [newMode] If not specified, the {@link CKEDITOR.config#startupMode} will be used.
	 * @param {Function} [callback] Optional callback function which is invoked once the mode switch has succeeded.
	 */
	CKEDITOR.editor.prototype.setMode = function( newMode, callback ) {
		var editor = this;

		var modes = this._.modes;

		// Mode loading quickly fails.
		if ( newMode == editor.mode || !modes || !modes[ newMode ] )
			return;

		editor.fire( 'beforeSetMode', newMode );

		if ( editor.mode ) {
			var isDirty = editor.checkDirty(),
				previousModeData = editor._.previousModeData,
				currentData,
				unlockSnapshot = 0;

			editor.fire( 'beforeModeUnload' );

			// Detach the current editable. While detaching editable will set
			// cached editor's data (with internal setData call). We use this
			// data below to avoid two getData() calls in a row.
			editor.editable( 0 );

			editor._.previousMode = editor.mode;
			// Get cached data, which was set while detaching editable.
			editor._.previousModeData = currentData = editor.getData( 1 );

			// If data has not been modified in the mode which we are currently leaving,
			// avoid making snapshot right after initializing new mode.
			// https://dev.ckeditor.com/ticket/5217#comment:20
			// Tested by:
			// 'test switch mode with unrecoreded, inner HTML specific content (boguses)'
			// 'test switch mode with unrecoreded, inner HTML specific content (boguses) plus changes in source mode'
			if ( editor.mode == 'source' && previousModeData == currentData ) {
				// We need to make sure that unlockSnapshot will update the last snapshot
				// (will not create new one) if lockSnapshot is not called on outdated snapshots stack.
				// Additionally, forceUpdate prevents from making content image now, which is useless
				// (because it equals editor data not inner HTML).
				editor.fire( 'lockSnapshot', { forceUpdate: true } );
				unlockSnapshot = 1;
			}

			// Clear up the mode space.
			editor.ui.space( 'contents' ).setHtml( '' );

			editor.mode = '';
		} else {
			editor._.previousModeData = editor.getData( 1 );
		}

		// Fire the mode handler.
		this._.modes[ newMode ]( function() {
			// Set the current mode.
			editor.mode = newMode;

			if ( isDirty !== undefined )
				!isDirty && editor.resetDirty();

			if ( unlockSnapshot )
				editor.fire( 'unlockSnapshot' );
			// Since snapshot made on dataReady (which normally catches changes done by setData)
			// won't work because editor.mode was not set yet (it's set in this function), we need
			// to make special snapshot for changes done in source mode here.
			else if ( newMode == 'wysiwyg' )
				editor.fire( 'saveSnapshot' );

			// Delay to avoid race conditions (setMode inside setMode).
			setTimeout( function() {
				editor.fire( 'mode' );
				callback && callback.call( editor );
			}, 0 );
		} );
	};

	/**
	 * Resizes the editor interface.
	 *
	 *		editor.resize( 900, 300 );
	 *
	 *		editor.resize( '100%', 450, true );
	 *
	 * @param {Number/String} width The new width. It can be an integer denoting a value
	 * in pixels or a CSS size value with unit.
	 * @param {Number/String} height The new height. It can be an integer denoting a value
	 * in pixels or a CSS size value with unit.
	 * @param {Boolean} [isContentHeight] Indicates that the provided height is to
	 * be applied to the editor content area, and not to the entire editor
	 * interface. Defaults to `false`.
	 * @param {Boolean} [resizeInner] Indicates that it is the inner interface
	 * element that must be resized, not the outer element. The default theme
	 * defines the editor interface inside a pair of `<span>` elements
	 * (`<span><span>...</span></span>`). By default the first,
	 * outer `<span>` element receives the sizes. If this parameter is set to
	 * `true`, the second, inner `<span>` is resized instead.
	 */
	CKEDITOR.editor.prototype.resize = function( width, height, isContentHeight, resizeInner ) {
		var container = this.container,
			contents = this.ui.space( 'contents' ),
			contentsFrame = CKEDITOR.env.webkit && this.document && this.document.getWindow().$.frameElement,
			outer;

		if ( resizeInner ) {
			outer = this.container.getFirst( function( node ) {
				return node.type == CKEDITOR.NODE_ELEMENT && node.hasClass( 'cke_inner' );
			} );
		} else {
			outer = container;
		}

		// Set as border box width. (https://dev.ckeditor.com/ticket/5353)
		outer.setSize( 'width', width, true );

		// WebKit needs to refresh the iframe size to avoid rendering issues. (1/2) (https://dev.ckeditor.com/ticket/8348)
		contentsFrame && ( contentsFrame.style.width = '1%' );

		// Get the height delta between the outer table and the content area.
		var contentsOuterDelta = ( outer.$.offsetHeight || 0 ) - ( contents.$.clientHeight || 0 ),

		// If we're setting the content area's height, then we don't need the delta.
			resultContentsHeight = Math.max( height - ( isContentHeight ? 0 : contentsOuterDelta ), 0 ),
			resultOuterHeight = ( isContentHeight ? height + contentsOuterDelta : height );

		contents.setStyle( 'height', resultContentsHeight + 'px' );

		// WebKit needs to refresh the iframe size to avoid rendering issues. (2/2) (https://dev.ckeditor.com/ticket/8348)
		contentsFrame && ( contentsFrame.style.width = '100%' );

		// Emit a resize event.
		this.fire( 'resize', {
			outerHeight: resultOuterHeight,
			contentsHeight: resultContentsHeight,
			// Sometimes width is not provided.
			outerWidth: width || outer.getSize( 'width' )
		} );
	};

	/**
	 * Gets the element that can be used to check the editor size. This method
	 * is mainly used by the [Editor Resize](https://ckeditor.com/cke4/addon/resize) plugin, which adds
	 * a UI handle that can be used to resize the editor.
	 *
	 * @param {Boolean} forContents Whether to return the "contents" part of the theme instead of the container.
	 * @returns {CKEDITOR.dom.element} The resizable element.
	 */
	CKEDITOR.editor.prototype.getResizable = function( forContents ) {
		return forContents ? this.ui.space( 'contents' ) : this.container;
	};

	function createInstance( element, config, data, mode ) {
		element = CKEDITOR.editor._getEditorElement( element );

		if ( !element ) {
			return null;
		}

		// Create the editor instance.
		var editor = new CKEDITOR.editor( config, element, mode );

		if ( mode == CKEDITOR.ELEMENT_MODE_REPLACE ) {
			// Do not replace the textarea right now, just hide it. The effective
			// replacement will be done later in the editor creation lifecycle.
			element.setStyle( 'visibility', 'hidden' );

			// https://dev.ckeditor.com/ticket/8031 Remember if textarea was required and remove the attribute.
			editor._.required = element.hasAttribute( 'required' );
			element.removeAttribute( 'required' );
		}

		data && editor.setData( data, null, true );

		// Once the editor is loaded, start the UI.
		editor.on( 'loaded', function() {
			loadTheme( editor );

			if ( mode == CKEDITOR.ELEMENT_MODE_REPLACE && editor.config.autoUpdateElement && element.$.form )
				editor._attachToForm();

			editor.setMode( editor.config.startupMode, function() {
				// Clean on startup.
				editor.resetDirty();

				// Editor is completely loaded for interaction.
				editor.status = 'ready';
				editor.fireOnce( 'instanceReady' );
				CKEDITOR.fire( 'instanceReady', null, editor );
			} );
		} );

		editor.on( 'destroy', destroy );
		return editor;
	}

	function destroy() {
		var editor = this,
			container = editor.container,
			element = editor.element;

		if ( container ) {
			container.clearCustomData();
			container.remove();
		}

		if ( element ) {
			element.clearCustomData();
			if ( editor.elementMode == CKEDITOR.ELEMENT_MODE_REPLACE ) {
				element.show();
				if ( editor._.required )
					element.setAttribute( 'required', 'required' );
			}
			delete editor.element;
		}
	}

	function loadTheme( editor ) {
		var name = editor.name,
			element = editor.element,
			elementMode = editor.elementMode;

		// Get the HTML for the predefined spaces.
		var topHtml = editor.fire( 'uiSpace', { space: 'top', html: '' } ).html;
		var bottomHtml = editor.fire( 'uiSpace', { space: 'bottom', html: '' } ).html;

		var themedTpl = new CKEDITOR.template(
			'<{outerEl}' +
				' id="cke_{name}"' +
				' class="{id} cke cke_reset cke_chrome cke_editor_{name} cke_{langDir} ' + CKEDITOR.env.cssClass + '" ' +
				' dir="{langDir}"' +
				' lang="{langCode}"' +
				' role="application"' +
				( editor.title ? ' aria-labelledby="cke_{name}_arialbl"' : '' ) +
				'>' +
				( editor.title ? '<span id="cke_{name}_arialbl" class="cke_voice_label">{voiceLabel}</span>' : '' ) +
				'<{outerEl} class="cke_inner cke_reset" role="presentation">' +
					'{topHtml}' +
					'<{outerEl} id="{contentId}" class="cke_contents cke_reset" role="presentation"></{outerEl}>' +
					'{bottomHtml}' +
				'</{outerEl}>' +
			'</{outerEl}>' );

		var container = CKEDITOR.dom.element.createFromHtml( themedTpl.output( {
			id: editor.id,
			name: name,
			langDir: editor.lang.dir,
			langCode: editor.langCode,
			voiceLabel: editor.title,
			topHtml: topHtml ? '<span id="' + editor.ui.spaceId( 'top' ) + '" class="cke_top cke_reset_all" role="presentation" style="height:auto">' + topHtml + '</span>' : '',
			contentId: editor.ui.spaceId( 'contents' ),
			bottomHtml: bottomHtml ? '<span id="' + editor.ui.spaceId( 'bottom' ) + '" class="cke_bottom cke_reset_all" role="presentation">' + bottomHtml + '</span>' : '',
			outerEl: CKEDITOR.env.ie ? 'span' : 'div'	// https://dev.ckeditor.com/ticket/9571
		} ) );

		if ( elementMode == CKEDITOR.ELEMENT_MODE_REPLACE ) {
			element.hide();
			container.insertAfter( element );
		} else {
			element.append( container );
		}

		editor.container = container;
		editor.ui.contentsElement = editor.ui.space( 'contents' );

		// Make top and bottom spaces unelectable, but not content space,
		// otherwise the editable area would be affected.
		topHtml && editor.ui.space( 'top' ).unselectable();
		bottomHtml && editor.ui.space( 'bottom' ).unselectable();

		var width = editor.config.width, height = editor.config.height;
		if ( width )
			container.setStyle( 'width', CKEDITOR.tools.cssLength( width ) );

		// The editor height is applied to the contents space.
		if ( height )
			editor.ui.space( 'contents' ).setStyle( 'height', CKEDITOR.tools.cssLength( height ) );

		// Disable browser context menu for editor's chrome.
		container.disableContextMenu();

		// Redirect the focus into editor for webkit. (https://dev.ckeditor.com/ticket/5713)
		CKEDITOR.env.webkit && container.on( 'focus', function() {
			editor.focus();
		} );

		editor.fireOnce( 'uiReady' );
	}

	// Replace all textareas with the default class name.
	CKEDITOR.domReady( function() {
		CKEDITOR.replaceClass && CKEDITOR.replaceAll( CKEDITOR.replaceClass );
	} );
} )();

/**
 * The current editing mode. An editing mode basically provides
 * different ways of editing or viewing the editor content.
 *
 *		alert( CKEDITOR.instances.editor1.mode ); // (e.g.) 'wysiwyg'
 *
 * @readonly
 * @property {String} mode
 */

/**
 * The mode to load at the editor startup. It depends on the plugins
 * loaded. By default, the `wysiwyg` and `source` modes are available.
 *
 *		config.startupMode = 'source';
 *
 * @cfg {String} [startupMode='wysiwyg']
 * @member CKEDITOR.config
 */
CKEDITOR.config.startupMode = 'wysiwyg';

/**
 * Fired after the editor instance is resized through
 * the {@link CKEDITOR.editor#method-resize CKEDITOR.resize} method.
 *
 * @event resize
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param {Object} data Available since CKEditor 4.5.0.
 * @param {Number} data.outerHeight The height of the entire area that the editor covers.
 * @param {Number} data.contentsHeight Editable area height in pixels.
 * @param {Number} data.outerWidth The width of the entire area that the editor covers.
 */

/**
 * Fired before changing the editing mode. See also
 * {@link #beforeSetMode} and {@link #event-mode}.
 *
 * @event beforeModeUnload
 * @param {CKEDITOR.editor} editor This editor instance.
 */

/**
 * Fired before the editor mode is set. See also
 * {@link #event-mode} and {@link #beforeModeUnload}.
 *
 * @since 3.5.3
 * @event beforeSetMode
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param {String} data The name of the mode which is about to be set.
 */

/**
 * Fired after setting the editing mode. See also {@link #beforeSetMode} and {@link #beforeModeUnload}
 *
 * @event mode
 * @param {CKEDITOR.editor} editor This editor instance.
 */

/**
 * Fired when the editor (replacing a `<textarea>` which has a `required` attribute) is empty during form submission.
 *
 * This event replaces native required fields validation that the browsers cannot
 * perform when CKEditor replaces `<textarea>` elements.
 *
 * You can cancel this event to prevent the page from submitting data.
 *
 *		editor.on( 'required', function( evt ) {
 *			alert( 'Article content is required.' );
 *			evt.cancel();
 *		} );
 *
 * @event required
 * @param {CKEDITOR.editor} editor This editor instance.
 */

/**
 * Fired when the UI space is created. This event allows to modify the top bar or the bottom bar with additional HTML.
 *
 * For example, it is used in the [Editor Resize](https://ckeditor.com/cke4/addon/resize) plugin
 * to add the HTML element used to resize the editor.
 *
 * @event uiSpace
 * @param {Object} data
 * @param {String} data.space The name of the {@link CKEDITOR.ui#space space} for which the event is fired.
 * @param {String} data.html HTML string which will be included in the given space.
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

( function() {
	var isNotWhitespace, isNotBookmark, isEmpty, isBogus, emptyParagraphRegexp,
		insert, fixTableAfterContentsDeletion, fixListAfterContentsDelete, getHtmlFromRangeHelpers, extractHtmlFromRangeHelpers;

	/**
	 * Editable class which provides all editing related activities by
	 * the `contenteditable` element, dynamically get attached to editor instance.
	 *
	 * @class CKEDITOR.editable
	 * @extends CKEDITOR.dom.element
	 */
	CKEDITOR.editable = CKEDITOR.tools.createClass( {
		base: CKEDITOR.dom.element,
		/**
		 * The constructor only stores generic editable creation logic that is commonly shared among
		 * all different editable elements.
		 *
		 * @constructor Creates an editable class instance.
		 * @param {CKEDITOR.editor} editor The editor instance on which the editable operates.
		 * @param {HTMLElement/CKEDITOR.dom.element} element Any DOM element that was as the editor's
		 * editing container, e.g. it could be either an HTML element with the `contenteditable` attribute
		 * set to the `true` that handles WYSIWYG editing or a `<textarea>` element that handles source editing.
		 */
		$: function( editor, element ) {
			// Transform the element into a CKEDITOR.dom.element instance.
			this.base( element.$ || element );

			this.editor = editor;

			/**
			 * Indicates the initialization status of the editable element. The following statuses are available:
			 *
			 *	* **unloaded** &ndash; the initial state. The editable's instance was created but
			 *	is not fully loaded (in particular it has no data).
			 *	* **ready** &ndash; the editable is fully initialized. The `ready` status is set after
			 *	the first {@link CKEDITOR.editor#method-setData} is called.
			 *	* **detached** &ndash; the editable was detached.
			 *
			 * @since 4.3.3
			 * @readonly
			 * @property {String}
			 */
			this.status = 'unloaded';

			/**
			 * Indicates whether the editable element gained focus.
			 *
			 * @property {Boolean} hasFocus
			 */
			this.hasFocus = false;

			// The bootstrapping logic.
			this.setup();
		},

		proto: {
			focus: function() {

				var active;

				// [Webkit] When DOM focus is inside of nested contenteditable elements,
				// apply focus on the main editable will compromise it's text selection.
				if ( CKEDITOR.env.webkit && !this.hasFocus ) {
					// Restore focus on element which we cached (on selectionCheck) as previously active.
					active = this.editor._.previousActive || this.getDocument().getActive();
					if ( this.contains( active ) ) {
						active.focus();
						return;
					}
				}

				// [Edge] Starting from EdgeHTML 14.14393, it does not support `setActive`. We need to use focus which
				// causes unexpected scroll. Store scrollTop value so it can be restored after focusing editor.
				// Scroll only happens if the editor is focused for the first time. (https://dev.ckeditor.com/ticket/14825)
				if ( CKEDITOR.env.edge && CKEDITOR.env.version > 14 && !this.hasFocus && this.getDocument().equals( CKEDITOR.document ) ) {
					this.editor._.previousScrollTop = this.$.scrollTop;
				}

				// [IE] Use instead "setActive" method to focus the editable if it belongs to the host page document,
				// to avoid bringing an unexpected scroll.
				try {
					if ( CKEDITOR.env.ie && !( CKEDITOR.env.edge && CKEDITOR.env.version > 14 ) && this.getDocument().equals( CKEDITOR.document ) ) {
						this.$.setActive();
					} else {
						// We have no control over exactly what happens when the native `focus` method is called,
						// so save the scroll position and restore it later.
						if ( CKEDITOR.env.chrome ) {
							var scrollPos = this.$.scrollTop;
							this.$.focus();
							this.$.scrollTop = scrollPos;
						} else {
							this.$.focus();
						}
					}
				} catch ( e ) {
					// IE throws unspecified error when focusing editable after closing dialog opened on nested editable.
					if ( !CKEDITOR.env.ie )
						throw e;
				}

				// Remedy if Safari doens't applies focus properly. (https://dev.ckeditor.com/ticket/279)
				if ( CKEDITOR.env.safari && !this.isInline() ) {
					active = CKEDITOR.document.getActive();
					if ( !active.equals( this.getWindow().getFrame() ) )
						this.getWindow().focus();

				}
			},

			/**
			 * Overrides {@link CKEDITOR.dom.element#on} to have special `focus/blur` handling.
			 * The `focusin/focusout` events are used in IE to replace regular `focus/blur` events
			 * because we want to avoid the asynchronous nature of later ones.
			 */
			on: function( name, fn ) {
				var args = Array.prototype.slice.call( arguments, 0 );

				if ( CKEDITOR.env.ie && ( /^focus|blur$/ ).exec( name ) ) {
					name = name == 'focus' ? 'focusin' : 'focusout';

					// The "focusin/focusout" events bubbled, e.g. If there are elements with layout
					// they fire this event when clicking in to edit them but it must be ignored
					// to allow edit their contents. (https://dev.ckeditor.com/ticket/4682)
					fn = isNotBubbling( fn, this );
					args[ 0 ] = name;
					args[ 1 ] = fn;
				}

				return CKEDITOR.dom.element.prototype.on.apply( this, args );
			},

			/**
			 * Registers an event listener that needs to be removed when detaching this editable.
			 * This means that it will be automatically removed when {@link #detach} is executed,
			 * for example on {@link CKEDITOR.editor#setMode changing editor mode} or destroying editor.
			 *
			 * Except for `obj` all other arguments have the same meaning as in {@link CKEDITOR.event#on}.
			 *
			 * This method is strongly related to the {@link CKEDITOR.editor#contentDom} and
			 * {@link CKEDITOR.editor#contentDomUnload} events, because they are fired
			 * when an editable is being attached and detached. Therefore, this method is usually used
			 * in the following way:
			 *
			 *		editor.on( 'contentDom', function() {
			 *			var editable = editor.editable();
			 *			editable.attachListener( editable, 'mousedown', function() {
			 *				// ...
			 *			} );
			 *		} );
			 *
			 * This code will attach the `mousedown` listener every time a new editable is attached
			 * to the editor, which in classic (`iframe`-based) editor happens every time the
			 * data or the mode is set. This listener will also be removed when that editable is detached.
			 *
			 * It is also possible to attach a listener to another object (e.g. to a document).
			 *
			 *		editor.on( 'contentDom', function() {
			 *			editor.editable().attachListener( editor.document, 'mousedown', function() {
			 *				// ...
			 *			} );
			 *		} );
			 *
			 * @param {CKEDITOR.event} obj The element/object to which the listener will be attached. Every object
			 * which inherits from {@link CKEDITOR.event} may be used including {@link CKEDITOR.dom.element},
			 * {@link CKEDITOR.dom.document}, and {@link CKEDITOR.editable}.
			 * @param {String} eventName The name of the event that will be listened to.
			 * @param {Function} listenerFunction The function listening to the
			 * event. A single {@link CKEDITOR.eventInfo} object instance
			 * containing all the event data is passed to this function.
			 * @param {Object} [scopeObj] The object used to scope the listener
			 * call (the `this` object). If omitted, the current object is used.
			 * @param {Object} [listenerData] Data to be sent as the
			 * {@link CKEDITOR.eventInfo#listenerData} when calling the listener.
			 * @param {Number} [priority=10] The listener priority. Lower priority
			 * listeners are called first. Listeners with the same priority
			 * value are called in the registration order.
			 * @returns {Object} An object containing the `removeListener`
			 * function that can be used to remove the listener at any time.
			 */
			attachListener: function( obj /*, event, fn, scope, listenerData, priority*/ ) {
				!this._.listeners && ( this._.listeners = [] );
				// Register the listener.
				var args = Array.prototype.slice.call( arguments, 1 ),
					listener = obj.on.apply( obj, args );

				this._.listeners.push( listener );

				return listener;
			},

			/**
			 * Remove all event listeners registered from {@link #attachListener}.
			 */
			clearListeners: function() {
				var listeners = this._.listeners;
				// Don't get broken by this.
				try {
					while ( listeners.length )
						listeners.pop().removeListener();
				} catch ( e ) {}
			},

			/**
			 * Restore all attribution changes made by {@link #changeAttr}.
			 */
			restoreAttrs: function() {
				var changes = this._.attrChanges, orgVal;
				for ( var attr in changes ) {
					if ( changes.hasOwnProperty( attr ) ) {
						orgVal = changes[ attr ];
						// Restore original attribute.
						orgVal !== null ? this.setAttribute( attr, orgVal ) : this.removeAttribute( attr );
					}
				}
			},

			/**
			 * Adds a CSS class name to this editable that needs to be removed on detaching.
			 *
			 * @param {String} className The class name to be added.
			 * @see CKEDITOR.dom.element#addClass
			 */
			attachClass: function( cls ) {
				var classes = this.getCustomData( 'classes' );
				if ( !this.hasClass( cls ) ) {
					!classes && ( classes = [] ), classes.push( cls );
					this.setCustomData( 'classes', classes );
					this.addClass( cls );
				}
			},

			/**
			 * Make an attribution change that would be reverted on editable detaching.
			 * @param {String} attr The attribute name to be changed.
			 * @param {String} val The value of specified attribute.
			 */
			changeAttr: function( attr, val ) {
				var orgVal = this.getAttribute( attr );
				if ( val !== orgVal ) {
					!this._.attrChanges && ( this._.attrChanges = {} );

					// Saved the original attribute val.
					if ( !( attr in this._.attrChanges ) )
						this._.attrChanges[ attr ] = orgVal;

					this.setAttribute( attr, val );
				}
			},

			/**
			 * Low-level method for inserting text into the editable.
			 * See the {@link CKEDITOR.editor#method-insertText} method which is the editor-level API
			 * for this purpose.
			 *
			 * @param {String} text
			 */
			insertText: function( text ) {
				// Focus the editor before calling transformPlainTextToHtml. (https://dev.ckeditor.com/ticket/12726)
				this.editor.focus();
				this.insertHtml( this.transformPlainTextToHtml( text ), 'text' );
			},

			/**
			 * Transforms plain text to HTML based on current selection and {@link CKEDITOR.editor#activeEnterMode}.
			 *
			 * @since 4.5.0
			 * @param {String} text Text to transform.
			 * @returns {String} HTML generated from the text.
			 */
			transformPlainTextToHtml: function( text ) {
				var enterMode = this.editor.getSelection().getStartElement().hasAscendant( 'pre', true ) ?
					CKEDITOR.ENTER_BR :
					this.editor.activeEnterMode;

				return CKEDITOR.tools.transformPlainTextToHtml( text, enterMode );
			},

			/**
			 * Low-level method for inserting HTML into the editable.
			 * See the {@link CKEDITOR.editor#method-insertHtml} method which is the editor-level API
			 * for this purpose.
			 *
			 * This method will insert HTML into the current selection or a given range. It also creates an undo snapshot,
			 * scrolls the viewport to the insertion and selects the range next to the inserted content.
			 * If you want to insert HTML without additional operations use {@link #method-insertHtmlIntoRange}.
			 *
			 * Fires the {@link CKEDITOR.editor#event-afterInsertHtml} event.
			 *
			 * @param {String} data The HTML to be inserted.
			 * @param {String} [mode='html'] See {@link CKEDITOR.editor#method-insertHtml}'s param.
			 * @param {CKEDITOR.dom.range} [range] If specified, the HTML will be inserted into the range
			 * instead of into the selection. The selection will be placed at the end of the insertion (like in the normal case).
			 * Introduced in CKEditor 4.5.0.
			 */
			insertHtml: function( data, mode, range ) {
				var editor = this.editor;

				editor.focus();
				editor.fire( 'saveSnapshot' );

				if ( !range ) {
					// HTML insertion only considers the first range.
					// Note: getRanges will be overwritten for tests since we want to test
					// custom ranges and bypass native selections.
					range = editor.getSelection().getRanges()[ 0 ];
				}

				// Default mode is 'html'.
				insert( this, mode || 'html', data, range );

				// Make the final range selection.
				range.select();

				afterInsert( this );

				this.editor.fire( 'afterInsertHtml', {} );
			},

			/**
			 * Inserts HTML into the position in the editor determined by the range.
			 *
			 * **Note:** This method does not {@link CKEDITOR.editor#saveSnapshot save undo snapshots} nor selects inserted
			 * HTML. If you want to do it, use {@link #method-insertHtml}.
			 *
			 * Fires the {@link CKEDITOR.editor#event-afterInsertHtml} event.
			 *
			 * @since 4.5.0
			 * @param {String} data HTML code to be inserted into the editor.
			 * @param {CKEDITOR.dom.range} range The range as a place of insertion.
			 * @param {String} [mode='html'] Mode in which HTML will be inserted.
			 * See {@link CKEDITOR.editor#method-insertHtml}.
			 */
			insertHtmlIntoRange: function( data, range, mode ) {
				// Default mode is 'html'
				insert( this, mode || 'html', data, range );

				this.editor.fire( 'afterInsertHtml', { intoRange: range } );
			},

			/**
			 * Low-level method for inserting an element into the editable.
			 * See the {@link CKEDITOR.editor#method-insertElement} method which is the editor-level API
			 * for this purpose.
			 *
			 * This method will insert the element into the current selection or a given range. It also creates an undo
			 * snapshot, scrolls the viewport to the insertion and selects the range next to the inserted content.
			 * If you want to insert an element without additional operations use {@link #method-insertElementIntoRange}.
			 *
			 * @param {CKEDITOR.dom.element} element The element to insert.
			 * @param {CKEDITOR.dom.range} [range] If specified, the element will be inserted into the range
			 * instead of into the selection.
			 */
			insertElement: function( element, range ) {
				var editor = this.editor;

				// Prepare for the insertion. For example - focus editor (https://dev.ckeditor.com/ticket/11848).
				editor.focus();
				editor.fire( 'saveSnapshot' );

				var enterMode = editor.activeEnterMode,
					selection = editor.getSelection(),
					elementName = element.getName(),
					isBlock = CKEDITOR.dtd.$block[ elementName ];

				if ( !range ) {
					range = selection.getRanges()[ 0 ];
				}

				// Insert element into first range only and ignore the rest (https://dev.ckeditor.com/ticket/11183).
				if ( this.insertElementIntoRange( element, range ) ) {
					range.moveToPosition( element, CKEDITOR.POSITION_AFTER_END );

					// If we're inserting a block element, the new cursor position must be
					// optimized. (https://dev.ckeditor.com/ticket/3100,https://dev.ckeditor.com/ticket/5436,https://dev.ckeditor.com/ticket/8950)
					if ( isBlock ) {
						// Find next, meaningful element.
						var next = element.getNext( function( node ) {
							return isNotEmpty( node ) && !isBogus( node );
						} );

						if ( next && next.type == CKEDITOR.NODE_ELEMENT && next.is( CKEDITOR.dtd.$block ) ) {
							// If the next one is a text block, move cursor to the start of it's content.
							if ( next.getDtd()[ '#' ] )
								range.moveToElementEditStart( next );
							// Otherwise move cursor to the before end of the last element.
							else
								range.moveToElementEditEnd( element );
						}
						// Open a new line if the block is inserted at the end of parent.
						else if ( !next && enterMode != CKEDITOR.ENTER_BR ) {
							next = range.fixBlock( true, enterMode == CKEDITOR.ENTER_DIV ? 'div' : 'p' );
							range.moveToElementEditStart( next );
						}
					}
				}

				// Set up the correct selection.
				selection.selectRanges( [ range ] );

				afterInsert( this );
			},

			/**
			 * Alias for {@link #insertElement}.
			 *
			 * @deprecated
			 * @param {CKEDITOR.dom.element} element The element to be inserted.
			 */
			insertElementIntoSelection: function( element ) {
				this.insertElement( element );
			},

			/**
			 * Inserts an element into the position in the editor determined by the range.
			 *
			 * **Note:** This method does not {@link CKEDITOR.editor#saveSnapshot save undo snapshots} nor selects the inserted
			 * element. If you want to do it, use the {@link #method-insertElement} method.
			 *
			 * @param {CKEDITOR.dom.element} element The element to be inserted.
			 * @param {CKEDITOR.dom.range} range The range as a place of insertion.
			 * @returns {Boolean} Informs whether the insertion was successful.
			 */
			insertElementIntoRange: function( element, range ) {
				var editor = this.editor,
					enterMode = editor.config.enterMode,
					elementName = element.getName(),
					isBlock = CKEDITOR.dtd.$block[ elementName ];

				if ( range.checkReadOnly() )
					return false;

				// Remove the original contents, merge split nodes.
				range.deleteContents( 1 );

				if ( range.startContainer.type == CKEDITOR.NODE_ELEMENT ) {
					// If range is placed in intermediate element (not td or th), we need to do three things:
					// * fill emptied <td/th>s with if browser needs them,
					// * remove empty text nodes so IE8 won't crash
					// (https://dev.ckeditor.com/ticket/11183#comment:8),
					// * fix structure and move range into the <td/th> element.
					if ( range.startContainer.is( { tr: 1, table: 1, tbody: 1, thead: 1, tfoot: 1 } ) ) {
						fixTableAfterContentsDeletion( range );
					} else if ( range.startContainer.is( CKEDITOR.dtd.$list ) ) {
						// Similarly there's a need for lists.
						fixListAfterContentsDelete( range );
					}
				}

				// If we're inserting a block at dtd-violated position, split
				// the parent blocks until we reach blockLimit.
				var current, dtd;

				if ( isBlock ) {
					while ( ( current = range.getCommonAncestor( 0, 1 ) ) &&
							( dtd = CKEDITOR.dtd[ current.getName() ] ) &&
							!( dtd && dtd[ elementName ] ) ) {
						// Split up inline elements.
						if ( current.getName() in CKEDITOR.dtd.span ) {
							var endNode = range.splitElement( current ),
								bookmark = range.createBookmark();

							// Remove empty element created after splitting (#2813).
							// The range.splitElement() method splits the given element in two and places the selection
							// in-between in such way that <div>F^oo</div> becomes <div>F</div>^<div>oo</div>.
							// Then removeEmptyInlineElement() method removes any of these elements if they are empty.
							removeEmptyInlineElement( current );
							removeEmptyInlineElement( endNode );

							range.moveToBookmark( bookmark );

						// If we're in an empty block which indicate a new paragraph,
						// simply replace it with the inserting block (https://dev.ckeditor.com/ticket/3664).
						} else if ( range.checkStartOfBlock() && range.checkEndOfBlock() ) {
							range.setStartBefore( current );
							range.collapse( true );
							current.remove();
						} else {
							range.splitBlock( enterMode == CKEDITOR.ENTER_DIV ? 'div' : 'p', editor.editable() );
						}
					}
				}

				// Insert the new node.
				range.insertNode( element );

				// Return true if insertion was successful.
				return true;
			},

			/**
			 * @see CKEDITOR.editor#setData
			 */
			setData: function( data, isSnapshot ) {
				if ( !isSnapshot )
					data = this.editor.dataProcessor.toHtml( data );

				this.setHtml( data );
				this.fixInitialSelection();

				// Editable is ready after first setData.
				if ( this.status == 'unloaded' )
					this.status = 'ready';

				this.editor.fire( 'dataReady' );
			},

			/**
			 * @see CKEDITOR.editor#getData
			 */
			getData: function( isSnapshot ) {
				var data = this.getHtml();

				if ( !isSnapshot )
					data = this.editor.dataProcessor.toDataFormat( data );

				return data;
			},

			/**
			 * Changes the read-only state of this editable.
			 *
			 * @param {Boolean} isReadOnly
			 */
			setReadOnly: function( isReadOnly ) {
				this.setAttribute( 'contenteditable', !isReadOnly );
			},

			/**
			 * Detaches this editable object from the DOM (removes classes, listeners, etc.)
			 */
			detach: function() {
				// Cleanup the element.
				this.removeClass( 'cke_editable' );

				this.status = 'detached';

				// Save the editor reference which will be lost after
				// calling detach from super class.
				var editor = this.editor;

				this._.detach();

				delete editor.document;
				delete editor.window;
			},

			/**
			 * Checks if the editable is one of the host page elements, indicates
			 * an inline editing environment.
			 *
			 * @returns {Boolean}
			 */
			isInline: function() {
				return this.getDocument().equals( CKEDITOR.document );
			},

			/**
			 * Fixes the selection and focus which may be in incorrect state after
			 * editable's inner HTML was overwritten.
			 *
			 * If the editable did not have focus, then the selection will be fixed when the editable
			 * is focused for the first time. If the editable already had focus, then the selection will
			 * be fixed immediately.
			 *
			 * To understand the problem see:
			 *
			 * * http://tests.ckeditor.dev:1030/tests/core/selection/manual/focusaftersettingdata
			 * * http://tests.ckeditor.dev:1030/tests/core/selection/manual/focusafterundoing
			 * * http://tests.ckeditor.dev:1030/tests/core/selection/manual/selectionafterfocusing
			 * * http://tests.ckeditor.dev:1030/tests/plugins/newpage/manual/selectionafternewpage
			 *
			 * @since 4.4.6
			 * @private
			 */
			fixInitialSelection: function() {
				var that = this;

				// Deal with IE8- IEQM (the old MS selection) first.
				if ( CKEDITOR.env.ie && ( CKEDITOR.env.version < 9 || CKEDITOR.env.quirks ) ) {
					if ( this.hasFocus ) {
						this.focus();
						fixMSSelection();
					}

					return;
				}

				// If editable did not have focus, fix the selection when it is first focused.
				if ( !this.hasFocus ) {
					this.once( 'focus', function() {
						fixSelection();
					}, null, null, -999 );
				// If editable had focus, fix the selection immediately.
				} else {
					this.focus();
					fixSelection();
				}

				function fixSelection() {
					var $doc = that.getDocument().$,
						$sel = $doc.getSelection();

					if ( requiresFix( $sel ) ) {
						var range = new CKEDITOR.dom.range( that );
						range.moveToElementEditStart( that );

						var $range = $doc.createRange();
						$range.setStart( range.startContainer.$, range.startOffset );
						$range.collapse( true );

						$sel.removeAllRanges();
						$sel.addRange( $range );
					}
				}

				function requiresFix( $sel ) {
					// This condition covers most broken cases after setting data.
					if ( $sel.anchorNode && $sel.anchorNode == that.$ ) {
						return true;
					}

					// Fix for:
					// http://tests.ckeditor.dev:1030/tests/core/selection/manual/focusaftersettingdata
					// (the inline editor TC)
					if ( CKEDITOR.env.webkit ) {
						var active = that.getDocument().getActive();
						if ( active && active.equals( that ) && !$sel.anchorNode ) {
							return true;
						}
					}
				}

				function fixMSSelection() {
					var $doc = that.getDocument().$,
						$sel = $doc.selection,
						active = that.getDocument().getActive();

					if ( $sel.type == 'None' && active.equals( that ) ) {
						var range = new CKEDITOR.dom.range( that ),
							parentElement,
							$range = $doc.body.createTextRange();

						range.moveToElementEditStart( that );

						parentElement = range.startContainer;
						if ( parentElement.type != CKEDITOR.NODE_ELEMENT ) {
							parentElement = parentElement.getParent();
						}

						$range.moveToElementText( parentElement.$ );
						$range.collapse( true );
						$range.select();
					}
				}
			},

			/**
			 * The base of the {@link CKEDITOR.editor#getSelectedHtml} method.
			 *
			 * @since 4.5.0
			 * @method getHtmlFromRange
			 * @param {CKEDITOR.dom.range} range
			 * @returns {CKEDITOR.dom.documentFragment}
			 */
			getHtmlFromRange: function( range ) {
				// There's nothing to return if range is collapsed.
				if ( range.collapsed )
					return new CKEDITOR.dom.documentFragment( range.document );

				// Info object passed between methods.
				var that = {
					doc: this.getDocument(),
					// Leave original range object untouched.
					range: range.clone()
				};

				getHtmlFromRangeHelpers.eol.detect( that, this );
				getHtmlFromRangeHelpers.bogus.exclude( that );
				getHtmlFromRangeHelpers.cell.shrink( that );

				that.fragment = that.range.cloneContents();

				getHtmlFromRangeHelpers.tree.rebuild( that, this );
				getHtmlFromRangeHelpers.eol.fix( that, this );

				return new CKEDITOR.dom.documentFragment( that.fragment.$ );
			},

			/**
			 * The base of the {@link CKEDITOR.editor#extractSelectedHtml} method.
			 *
			 * **Note:** The range is modified so it matches the desired selection after extraction
			 * even though the selection is not made.
			 *
			 * @since 4.5.0
			 * @param {CKEDITOR.dom.range} range
			 * @param {Boolean} [removeEmptyBlock=false] See {@link CKEDITOR.editor#extractSelectedHtml}'s parameter.
			 * Note that the range will not be modified if this parameter is set to `true`.
			 * @returns {CKEDITOR.dom.documentFragment} The extracted fragment of the editable content.
			 */
			extractHtmlFromRange: function( range, removeEmptyBlock ) {
				var helpers = extractHtmlFromRangeHelpers,
					that = {
						range: range,
						doc: range.document
					},
					// Since it is quite hard to build a valid documentFragment
					// out of extracted contents because DOM changes, let's mimic
					// extracted HTML with #getHtmlFromRange. Yep. It's a hack.
					extractedFragment = this.getHtmlFromRange( range );

				// Collapsed range means that there's nothing to extract.
				if ( range.collapsed ) {
					range.optimize();
					return extractedFragment;
				}

				// Include inline element if possible.
				range.enlarge( CKEDITOR.ENLARGE_INLINE, 1 );

				// This got to be done before bookmarks are created because purging
				// depends on the position of the range at the boundaries of the table,
				// usually distorted by bookmark spans.
				helpers.table.detectPurge( that );

				// We'll play with DOM, let's hold the position of the range.
				that.bookmark = range.createBookmark();
				// While bookmarked, make unaccessible, to make sure that none of the methods
				// will try to use it (they should use that.bookmark).
				// This is done because ranges get desynchronized with the DOM when more bookmarks
				// is created (as for instance that.targetBookmark).
				delete that.range;

				// The range to be restored after extraction should be kept
				// outside of the range, so it's not removed by range.extractContents.
				var targetRange = this.editor.createRange();
				targetRange.moveToPosition( that.bookmark.startNode, CKEDITOR.POSITION_BEFORE_START );
				that.targetBookmark = targetRange.createBookmark();

				// Execute content-specific detections.
				helpers.list.detectMerge( that, this );
				helpers.table.detectRanges( that, this );
				helpers.block.detectMerge( that, this );

				// Simply, do the job.
				if ( that.tableContentsRanges ) {
					helpers.table.deleteRanges( that );

					// Done here only to remove bookmark's spans.
					range.moveToBookmark( that.bookmark );
					that.range = range;
				} else {
					// To use the range we need to restore the bookmark and make
					// the range accessible again.
					range.moveToBookmark( that.bookmark );
					that.range = range;
					range.extractContents( helpers.detectExtractMerge( that ) );
				}

				// Move working range to desired, pre-computed position.
				range.moveToBookmark( that.targetBookmark );

				// Make sure range is always anchored in an element. For consistency.
				range.optimize();

				// It my happen that the uncollapsed range which referred to a valid selection,
				// will be placed in an uneditable location after being collapsed:
				// <tr>[<td>x</td>]</tr> -> <tr>[]<td>x</td></tr> -> <tr><td>[]x</td></tr>
				helpers.fixUneditableRangePosition( range );

				// Execute content-specific post-extract routines.
				helpers.list.merge( that, this );
				helpers.table.purge( that, this );
				helpers.block.merge( that, this );

				// Remove empty block, duh!
				if ( removeEmptyBlock ) {
					var path = range.startPath();

					// <p><b>^</b></p> is empty block.
					if (
						range.checkStartOfBlock() &&
						range.checkEndOfBlock() &&
						path.block &&
						!range.root.equals( path.block ) &&
						// Do not remove a block with bookmarks. (https://dev.ckeditor.com/ticket/13465)
						!hasBookmarks( path.block ) ) {
						range.moveToPosition( path.block, CKEDITOR.POSITION_BEFORE_START );
						path.block.remove();
					}
				} else {
					// Auto paragraph, if needed.
					helpers.autoParagraph( this.editor, range );

					// Let's have a bogus next to the caret, if needed.
					if ( isEmpty( range.startContainer ) )
						range.startContainer.appendBogus();
				}

				// Merge inline siblings if any around the caret.
				range.startContainer.mergeSiblings();

				return extractedFragment;
			},

			/**
			 * Editable element bootstrapping.
			 *
			 * @private
			 */
			setup: function() {
				var editor = this.editor;

				// Handle the load/read of editor data/snapshot.
				this.attachListener( editor, 'beforeGetData', function() {
					var data = this.getData();

					// Post processing html output of wysiwyg editable.
					if ( !this.is( 'textarea' ) ) {
						// Reset empty if the document contains only one empty paragraph.
						if ( editor.config.ignoreEmptyParagraph !== false )
							data = data.replace( emptyParagraphRegexp, function( match, lookback ) {
								return lookback;
							} );
					}

					editor.setData( data, null, 1 );
				}, this );

				this.attachListener( editor, 'getSnapshot', function( evt ) {
					evt.data = this.getData( 1 );
				}, this );

				this.attachListener( editor, 'afterSetData', function() {
					this.setData( editor.getData( 1 ) );
				}, this );
				this.attachListener( editor, 'loadSnapshot', function( evt ) {
					this.setData( evt.data, 1 );
				}, this );

				// Delegate editor focus/blur to editable.
				this.attachListener( editor, 'beforeFocus', function() {
					var sel = editor.getSelection(),
						ieSel = sel && sel.getNative();

					// IE considers control-type element as separate
					// focus host when selected, avoid destroying the
					// selection in such case. (https://dev.ckeditor.com/ticket/5812) (https://dev.ckeditor.com/ticket/8949)
					if ( ieSel && ieSel.type == 'Control' )
						return;

					this.focus();
				}, this );

				this.attachListener( editor, 'insertHtml', function( evt ) {
					this.insertHtml( evt.data.dataValue, evt.data.mode, evt.data.range );
				}, this );
				this.attachListener( editor, 'insertElement', function( evt ) {
					this.insertElement( evt.data );
				}, this );
				this.attachListener( editor, 'insertText', function( evt ) {
					this.insertText( evt.data );
				}, this );

				// Update editable state.
				this.setReadOnly( editor.readOnly );

				// The editable class.
				this.attachClass( 'cke_editable' );

				// The element mode css class.
				if ( editor.elementMode == CKEDITOR.ELEMENT_MODE_INLINE ) {
					this.attachClass( 'cke_editable_inline' );
				} else if ( editor.elementMode == CKEDITOR.ELEMENT_MODE_REPLACE ||
					editor.elementMode == CKEDITOR.ELEMENT_MODE_APPENDTO ) {
					this.attachClass( 'cke_editable_themed' );
				}

				this.attachClass( 'cke_contents_' + editor.config.contentsLangDirection );

				// Setup editor keystroke handlers on this element.
				var keystrokeHandler = editor.keystrokeHandler;

				// If editor is read-only, then make sure that BACKSPACE key
				// is blocked to prevent browser history navigation.
				keystrokeHandler.blockedKeystrokes[ 8 ] = +editor.readOnly;

				editor.keystrokeHandler.attach( this );

				// Update focus states.
				this.on( 'blur', function() {
					this.hasFocus = false;
				}, null, null, -1 );

				this.on( 'focus', function() {
					this.hasFocus = true;
				}, null, null, -1 );

				if ( CKEDITOR.env.webkit ) {
					// [WebKit] Save scrollTop value so it can be used when restoring locked selection. (https://dev.ckeditor.com/ticket/14659)
					this.on( 'scroll', function() {
						editor._.previousScrollTop = editor.editable().$.scrollTop;
					}, null, null, -1 );
				}

				// [Edge] This is the other part of the workaround for Edge which restores saved
				// scrollTop value and removes listener which is not needed anymore. (https://dev.ckeditor.com/ticket/14825)
				if ( CKEDITOR.env.edge && CKEDITOR.env.version > 14 ) {

					var fixScrollOnFocus = function() {
						var editable = editor.editable();

						if ( editor._.previousScrollTop != null && editable.getDocument().equals( CKEDITOR.document ) ) {
							editable.$.scrollTop = editor._.previousScrollTop;
							editor._.previousScrollTop = null;
							this.removeListener( 'scroll', fixScrollOnFocus );
						}
					};

					this.on( 'scroll', fixScrollOnFocus );
				}

				// Register to focus manager.
				editor.focusManager.add( this );

				// Inherit the initial focus on editable element.
				if ( this.equals( CKEDITOR.document.getActive() ) ) {
					this.hasFocus = true;
					// Pending until this editable has attached.
					editor.once( 'contentDom', function() {
						editor.focusManager.focus( this );
					}, this );
				}

				// Apply tab index on demand, with original direction saved.
				if ( this.isInline() ) {

					// tabIndex of the editable is different than editor's one.
					// Update the attribute of the editable.
					this.changeAttr( 'tabindex', editor.tabIndex );
				}

				// The above is all we'll be doing for a <textarea> editable.
				if ( this.is( 'textarea' ) )
					return;

				// The DOM document which the editing acts upon.
				editor.document = this.getDocument();
				editor.window = this.getWindow();

				var doc = editor.document;

				this.changeAttr( 'spellcheck', !editor.config.disableNativeSpellChecker );

				// Apply contents direction on demand, with original direction saved.
				var dir = editor.config.contentsLangDirection;
				if ( this.getDirection( 1 ) != dir )
					this.changeAttr( 'dir', dir );

				// Create the content stylesheet for this document.
				var styles = CKEDITOR.getCss();
				if ( styles ) {
					var head = doc.getHead(),
						stylesElement = head.getCustomData( 'stylesheet' );

					if ( !stylesElement ) {
						var sheet = doc.appendStyleText( styles );
						sheet = new CKEDITOR.dom.element( sheet.ownerNode || sheet.owningElement );
						head.setCustomData( 'stylesheet', sheet );
						sheet.data( 'cke-temp', 1 );
					} else if ( styles != stylesElement.getText() ) {
						CKEDITOR.env.ie && CKEDITOR.env.version < 9 ? stylesElement.$.styleSheet.cssText = styles : stylesElement.setText( styles );
					}
				}

				// Update the stylesheet sharing count.
				var ref = doc.getCustomData( 'stylesheet_ref' ) || 0;
				doc.setCustomData( 'stylesheet_ref', ref + 1 );

				// Pass this configuration to styles system.
				this.setCustomData( 'cke_includeReadonly', !editor.config.disableReadonlyStyling );

				// Prevent the browser opening read-only links. (https://dev.ckeditor.com/ticket/6032 & https://dev.ckeditor.com/ticket/10912)
				this.attachListener( this, 'click', function( evt ) {
					evt = evt.data;

					var link = new CKEDITOR.dom.elementPath( evt.getTarget(), this ).contains( 'a' );

					if ( link && evt.$.button != 2 && link.isReadOnly() )
						evt.preventDefault();
				} );

				var backspaceOrDelete = { 8: 1, 46: 1 };

				// Override keystrokes which should have deletion behavior
				//  on fully selected element . (https://dev.ckeditor.com/ticket/4047) (https://dev.ckeditor.com/ticket/7645)
				this.attachListener( editor, 'key', function( evt ) {
					if ( editor.readOnly )
						return true;

					// Use getKey directly in order to ignore modifiers.
					// Justification: https://dev.ckeditor.com/ticket/11861#comment:13
					var keyCode = evt.data.domEvent.getKey(),
						isHandled;

					// Prevent of reading path of empty range (https://dev.ckeditor.com/ticket/13096, #457).
					var sel = editor.getSelection();
					if ( sel.getRanges().length === 0 ) {
						return;
					}

					// Backspace OR Delete.
					if ( keyCode in backspaceOrDelete ) {
						var selected,
							range = sel.getRanges()[ 0 ],
							path = range.startPath(),
							block,
							parent,
							next,
							rtl = keyCode == 8;


						if (
								// [IE<11] Remove selected image/anchor/etc here to avoid going back in history. (https://dev.ckeditor.com/ticket/10055)
								( CKEDITOR.env.ie && CKEDITOR.env.version < 11 && ( selected = sel.getSelectedElement() ) ) ||
								// Remove the entire list/table on fully selected content. (https://dev.ckeditor.com/ticket/7645)
								( selected = getSelectedTableList( sel ) ) ) {
							// Make undo snapshot.
							editor.fire( 'saveSnapshot' );

							// Delete any element that 'hasLayout' (e.g. hr,table) in IE8 will
							// break up the selection, safely manage it here. (https://dev.ckeditor.com/ticket/4795)
							range.moveToPosition( selected, CKEDITOR.POSITION_BEFORE_START );
							// Remove the control manually.
							selected.remove();
							range.select();

							editor.fire( 'saveSnapshot' );

							isHandled = 1;
						} else if ( range.collapsed ) {
							// Handle the following special cases: (https://dev.ckeditor.com/ticket/6217)
							// 1. Del/Backspace key before/after table;
							// 2. Backspace Key after start of table.
							if ( ( block = path.block ) &&
									( next = block[ rtl ? 'getPrevious' : 'getNext' ]( isNotWhitespace ) ) &&
									( next.type == CKEDITOR.NODE_ELEMENT ) &&
									next.is( 'table' ) &&
									range[ rtl ? 'checkStartOfBlock' : 'checkEndOfBlock' ]() ) {
								editor.fire( 'saveSnapshot' );

								// Remove the current empty block.
								if ( range[ rtl ? 'checkEndOfBlock' : 'checkStartOfBlock' ]() )
									block.remove();

								// Move cursor to the beginning/end of table cell.
								range[ 'moveToElementEdit' + ( rtl ? 'End' : 'Start' ) ]( next );
								range.select();

								editor.fire( 'saveSnapshot' );

								isHandled = 1;
							}
							else if ( path.blockLimit && path.blockLimit.is( 'td' ) &&
									( parent = path.blockLimit.getAscendant( 'table' ) ) &&
									range.checkBoundaryOfElement( parent, rtl ? CKEDITOR.START : CKEDITOR.END ) &&
									( next = parent[ rtl ? 'getPrevious' : 'getNext' ]( isNotWhitespace ) ) ) {
								editor.fire( 'saveSnapshot' );

								// Move cursor to the end of previous block.
								range[ 'moveToElementEdit' + ( rtl ? 'End' : 'Start' ) ]( next );

								// Remove any previous empty block.
								if ( range.checkStartOfBlock() && range.checkEndOfBlock() )
									next.remove();
								else
									range.select();

								editor.fire( 'saveSnapshot' );

								isHandled = 1;
							}
							// BACKSPACE/DEL pressed at the start/end of table cell.
							else if ( ( parent = path.contains( [ 'td', 'th', 'caption' ] ) ) &&
									range.checkBoundaryOfElement( parent, rtl ? CKEDITOR.START : CKEDITOR.END ) ) {
								isHandled = 1;
							}
						}

					}

					return !isHandled;
				} );

				// On IE>=11 we need to fill blockless editable with <br> if it was deleted.
				if ( editor.blockless && CKEDITOR.env.ie && CKEDITOR.env.needsBrFiller ) {
					this.attachListener( this, 'keyup', function( evt ) {
						if ( evt.data.getKeystroke() in backspaceOrDelete && !this.getFirst( isNotEmpty ) ) {
							this.appendBogus();

							// Set the selection before bogus, because IE tends to put it after.
							var range = editor.createRange();
							range.moveToPosition( this, CKEDITOR.POSITION_AFTER_START );
							range.select();
						}
					} );
				}

				this.attachListener( this, 'dblclick', function( evt ) {
					if ( editor.readOnly )
						return false;

					var data = { element: evt.data.getTarget() };
					editor.fire( 'doubleclick', data );
				} );

				// Prevent automatic submission in IE https://dev.ckeditor.com/ticket/6336
				CKEDITOR.env.ie && this.attachListener( this, 'click', blockInputClick );

				// Gecko/Webkit need some help when selecting control type elements. (https://dev.ckeditor.com/ticket/3448)
				// We apply same behavior for IE Edge. (https://dev.ckeditor.com/ticket/13386)
				if ( !CKEDITOR.env.ie || CKEDITOR.env.edge ) {
					this.attachListener( this, 'mousedown', function( ev ) {
						var control = ev.data.getTarget();
						// https://dev.ckeditor.com/ticket/11727. Note: htmlDP assures that input/textarea/select have contenteditable=false
						// attributes. However, they also have data-cke-editable attribute, so isReadOnly() returns false,
						// and therefore those elements are correctly selected by this code.
						if ( control.is( 'img', 'hr', 'input', 'textarea', 'select' ) && !control.isReadOnly() ) {
							editor.getSelection().selectElement( control );

							// Prevent focus from stealing from the editable. (https://dev.ckeditor.com/ticket/9515)
							if ( control.is( 'input', 'textarea', 'select' ) )
								ev.data.preventDefault();
						}
					} );
				}

				// For some reason, after click event is done, IE Edge loses focus on the selected element. (https://dev.ckeditor.com/ticket/13386)
				// Additional check for readonly disabled selecting of non-editable images (#2129).
				if ( CKEDITOR.env.edge ) {
					this.attachListener( this, 'mouseup', function( ev ) {
						var selectedElement = ev.data.getTarget();
						if ( selectedElement && selectedElement.is( 'img' ) && !selectedElement.isReadOnly() ) {
							editor.getSelection().selectElement( selectedElement );
						}
					} );
				}

				// Prevent right click from selecting an empty block even
				// when selection is anchored inside it. (https://dev.ckeditor.com/ticket/5845)
				if ( CKEDITOR.env.gecko ) {
					this.attachListener( this, 'mouseup', function( ev ) {
						if ( ev.data.$.button == 2 ) {
							var target = ev.data.getTarget();

							if ( !target.getAscendant( 'table' ) && !target.getOuterHtml().replace( emptyParagraphRegexp, '' ) ) {
								var range = editor.createRange();
								range.moveToElementEditStart( target );
								range.select( true );
							}
						}
					} );
				}

				// Webkit: avoid from editing form control elements content.
				if ( CKEDITOR.env.webkit ) {
					// Prevent from tick checkbox/radiobox/select
					this.attachListener( this, 'click', function( ev ) {
						if ( ev.data.getTarget().is( 'input', 'select' ) )
							ev.data.preventDefault();
					} );

					// Prevent from editig textfield/textarea value.
					this.attachListener( this, 'mouseup', function( ev ) {
						if ( ev.data.getTarget().is( 'input', 'textarea' ) )
							ev.data.preventDefault();
					} );
				}

				// Prevent Webkit/Blink from going rogue when joining
				// blocks on BACKSPACE/DEL (https://dev.ckeditor.com/ticket/11861,https://dev.ckeditor.com/ticket/9998).
				if ( CKEDITOR.env.webkit ) {
					this.attachListener( editor, 'key', function( evt ) {
						if ( editor.readOnly ) {
							return true;
						}

						// Use getKey directly in order to ignore modifiers.
						// Justification: https://dev.ckeditor.com/ticket/11861#comment:13
						var key = evt.data.domEvent.getKey();

						if ( !( key in backspaceOrDelete ) )
							return;

						// Prevent of reading path of empty range (https://dev.ckeditor.com/ticket/13096, #457).
						var sel = editor.getSelection();
						if ( sel.getRanges().length === 0 ) {
							return;
						}

						var backspace = key == 8,
							range = sel.getRanges()[ 0 ],
							startPath = range.startPath();

						if ( range.collapsed ) {
							if ( !mergeBlocksCollapsedSelection( editor, range, backspace, startPath ) )
								return;
						} else {
							if ( !mergeBlocksNonCollapsedSelection( editor, range, startPath ) )
								return;
						}

						// Scroll to the new position of the caret (https://dev.ckeditor.com/ticket/11960).
						editor.getSelection().scrollIntoView();
						editor.fire( 'saveSnapshot' );

						return false;
					}, this, null, 100 ); // Later is better – do not override existing listeners.
				}
			}
		},

		_: {
			detach: function() {
				// Update the editor cached data with current data.
				this.editor.setData( this.editor.getData(), 0, 1 );

				this.clearListeners();
				this.restoreAttrs();

				// Cleanup our custom classes.
				var classes;
				if ( ( classes = this.removeCustomData( 'classes' ) ) ) {
					while ( classes.length )
						this.removeClass( classes.pop() );
				}

				// Remove contents stylesheet from document if it's the last usage.
				if ( !this.is( 'textarea' ) ) {
					var doc = this.getDocument(),
						head = doc.getHead();
					if ( head.getCustomData( 'stylesheet' ) ) {
						var refs = doc.getCustomData( 'stylesheet_ref' );
						if ( !( --refs ) ) {
							doc.removeCustomData( 'stylesheet_ref' );
							var sheet = head.removeCustomData( 'stylesheet' );
							sheet.remove();
						} else {
							doc.setCustomData( 'stylesheet_ref', refs );
						}
					}
				}

				this.editor.fire( 'contentDomUnload' );

				// Free up the editor reference.
				delete this.editor;
			}
		}
	} );

	/**
	 * Creates, retrieves or detaches an editable element of the editor.
	 * This method should always be used instead of calling {@link CKEDITOR.editable} directly.
	 *
	 * @method editable
	 * @member CKEDITOR.editor
	 * @param {CKEDITOR.dom.element/CKEDITOR.editable} [elementOrEditable] The
	 * DOM element to become the editable or a {@link CKEDITOR.editable} object.
	 * @returns {CKEDITOR.dom.element/null} The editor's editable element, or `null` if not available.
	 */
	CKEDITOR.editor.prototype.editable = function( element ) {
		var editable = this._.editable;

		// This editor has already associated with
		// an editable element, silently fails.
		if ( editable && element )
			return 0;

		if ( arguments.length ) {
			editable = this._.editable = element ? ( element instanceof CKEDITOR.editable ? element : new CKEDITOR.editable( this, element ) ) :
			// Detach the editable from editor.
			( editable && editable.detach(), null );
		}

		// Just retrieve the editable.
		return editable;
	};

	CKEDITOR.on( 'instanceLoaded', function( evt ) {
		var editor = evt.editor;

		// and flag that the element was locked by our code so it'll be editable by the editor functions (https://dev.ckeditor.com/ticket/6046).
		editor.on( 'insertElement', function( evt ) {
			var element = evt.data;
			if ( element.type == CKEDITOR.NODE_ELEMENT && ( element.is( 'input' ) || element.is( 'textarea' ) ) ) {
				// // The element is still not inserted yet, force attribute-based check.
				if ( element.getAttribute( 'contentEditable' ) != 'false' )
					element.data( 'cke-editable', element.hasAttribute( 'contenteditable' ) ? 'true' : '1' );
				element.setAttribute( 'contentEditable', false );
			}
		} );

		editor.on( 'selectionChange', function( evt ) {
			if ( editor.readOnly )
				return;

			// Auto fixing on some document structure weakness to enhance usabilities. (https://dev.ckeditor.com/ticket/3190 and https://dev.ckeditor.com/ticket/3189)
			var sel = editor.getSelection();
			// Do it only when selection is not locked. (https://dev.ckeditor.com/ticket/8222)
			if ( sel && !sel.isLocked ) {
				var isDirty = editor.checkDirty();

				// Lock undoM before touching DOM to prevent
				// recording these changes as separate snapshot.
				editor.fire( 'lockSnapshot' );
				fixDom( evt );
				editor.fire( 'unlockSnapshot' );

				!isDirty && editor.resetDirty();
			}
		} );
	} );

	CKEDITOR.on( 'instanceCreated', function( evt ) {
		var editor = evt.editor;

		editor.on( 'mode', function() {

			var editable = editor.editable();

			// Setup proper ARIA roles and properties for inline editable, classic
			// (iframe-based) editable is instead handled by plugin.
			if ( editable && editable.isInline() ) {

				var ariaLabel = editor.title;

				editable.changeAttr( 'role', 'textbox' );
				editable.changeAttr( 'aria-multiline', 'true' ); // (#1034)
				editable.changeAttr( 'aria-label', ariaLabel );

				if ( ariaLabel )
					editable.changeAttr( 'title', ariaLabel );

				var helpLabel = editor.fire( 'ariaEditorHelpLabel', {} ).label;
				if ( helpLabel ) {
					// Put the voice label in different spaces, depending on element mode, so
					// the DOM element get auto detached on mode reload or editor destroy.
					var ct = this.ui.space( this.elementMode == CKEDITOR.ELEMENT_MODE_INLINE ? 'top' : 'contents' );
					if ( ct ) {
						var ariaDescId = CKEDITOR.tools.getNextId(),
							desc = CKEDITOR.dom.element.createFromHtml( '<span id="' + ariaDescId + '" class="cke_voice_label">' + helpLabel + '</span>' );
						ct.append( desc );
						editable.changeAttr( 'aria-describedby', ariaDescId );
					}
				}
			}
		} );
	} );

	// https://dev.ckeditor.com/ticket/9222: Show text cursor in Gecko.
	// Show default cursor over control elements on all non-IEs.
	CKEDITOR.addCss( '.cke_editable{cursor:text}.cke_editable img,.cke_editable input,.cke_editable textarea{cursor:default}' );

	//
	//
	// Bazillion helpers for the editable class and above listeners.
	//
	//

	isNotWhitespace = CKEDITOR.dom.walker.whitespaces( true ),
	isNotBookmark = CKEDITOR.dom.walker.bookmark( false, true ),
	isEmpty = CKEDITOR.dom.walker.empty(),
	isBogus = CKEDITOR.dom.walker.bogus(),
	// Matching an empty paragraph at the end of document.
	emptyParagraphRegexp = /(^|<body\b[^>]*>)\s*<(p|div|address|h\d|center|pre)[^>]*>\s*(?:<br[^>]*>|&nbsp;|\u00A0|&#160;)?\s*(:?<\/\2>)?\s*(?=$|<\/body>)/gi;

	// Auto-fixing block-less content by wrapping paragraph (https://dev.ckeditor.com/ticket/3190), prevent
	// non-exitable-block by padding extra br.(https://dev.ckeditor.com/ticket/3189)
	// Returns truly value when dom was changed, falsy otherwise.
	function fixDom( evt ) {
		var editor = evt.editor,
			path = evt.data.path,
			blockLimit = path.blockLimit,
			selection = evt.data.selection,
			range = selection.getRanges()[ 0 ],
			selectionUpdateNeeded;

		if ( CKEDITOR.env.gecko || ( CKEDITOR.env.ie && CKEDITOR.env.needsBrFiller ) ) {
			var blockNeedsFiller = needsBrFiller( selection, path );
			if ( blockNeedsFiller ) {
				blockNeedsFiller.appendBogus();
				// IE tends to place selection after appended bogus, so we need to
				// select the original range (placed before bogus).
				selectionUpdateNeeded = CKEDITOR.env.ie;
			}
		}

		// When we're in block enter mode, a new paragraph will be established
		// to encapsulate inline contents inside editable. (https://dev.ckeditor.com/ticket/3657)
		// Don't autoparagraph if browser (namely - IE) incorrectly anchored selection
		// inside non-editable content. This happens e.g. if non-editable block is the only
		// content of editable.
		if ( shouldAutoParagraph( editor, path.block, blockLimit ) && range.collapsed && !range.getCommonAncestor().isReadOnly() ) {
			var testRng = range.clone();
			testRng.enlarge( CKEDITOR.ENLARGE_BLOCK_CONTENTS );
			var walker = new CKEDITOR.dom.walker( testRng );
			walker.guard = function( node ) {
				return !isNotEmpty( node ) ||
					node.type == CKEDITOR.NODE_COMMENT ||
					node.isReadOnly();
			};

			// 1. Inline content discovered under cursor;
			// 2. Empty editable.
			if ( !walker.checkForward() || testRng.checkStartOfBlock() && testRng.checkEndOfBlock() ) {
				var fixedBlock = range.fixBlock( true, editor.activeEnterMode == CKEDITOR.ENTER_DIV ? 'div' : 'p' );

				// For IE<11, we should remove any filler node which was introduced before.
				if ( !CKEDITOR.env.needsBrFiller ) {
					var first = fixedBlock.getFirst( isNotEmpty );
					if ( first && isNbsp( first ) )
						first.remove();
				}

				selectionUpdateNeeded = 1;

				// Cancel this selection change in favor of the next (correct). (https://dev.ckeditor.com/ticket/6811)
				evt.cancel();
			}
		}

		if ( selectionUpdateNeeded )
			range.select();
	}

	// Checks whether current selection requires br filler to be appended.
	// @returns Block which needs filler or falsy value.
	function needsBrFiller( selection, path ) {
		// Fake selection does not need filler, because it is fake.
		if ( selection.isFake )
			return 0;

		// Ensure bogus br could help to move cursor (out of styles) to the end of block. (https://dev.ckeditor.com/ticket/7041)
		var pathBlock = path.block || path.blockLimit,
			lastNode = pathBlock && pathBlock.getLast( isNotEmpty );

		// Check some specialities of the current path block:
		// 1. It is really displayed as block; (https://dev.ckeditor.com/ticket/7221)
		// 2. It doesn't end with one inner block; (https://dev.ckeditor.com/ticket/7467)
		// 3. It doesn't have bogus br yet.
		if (
			pathBlock && pathBlock.isBlockBoundary() &&
			!( lastNode && lastNode.type == CKEDITOR.NODE_ELEMENT && lastNode.isBlockBoundary() ) &&
			!pathBlock.is( 'pre' ) && !pathBlock.getBogus()
		)
			return pathBlock;
	}

	function blockInputClick( evt ) {
		var element = evt.data.getTarget();
		if ( element.is( 'input' ) ) {
			var type = element.getAttribute( 'type' );
			if ( type == 'submit' || type == 'reset' )
				evt.data.preventDefault();
		}
	}

	function isNotEmpty( node ) {
		return isNotWhitespace( node ) && isNotBookmark( node );
	}

	function isNbsp( node ) {
		return node.type == CKEDITOR.NODE_TEXT && CKEDITOR.tools.trim( node.getText() ).match( /^(?:&nbsp;|\xa0)$/ );
	}

	function isNotBubbling( fn, src ) {
		return function( evt ) {
			var other = evt.data.$.toElement || evt.data.$.fromElement || evt.data.$.relatedTarget;

			// First of all, other may simply be null/undefined.
			// Second of all, at least early versions of Spartan returned empty objects from evt.relatedTarget,
			// so let's also check the node type.
			other = ( other && other.nodeType == CKEDITOR.NODE_ELEMENT ) ? new CKEDITOR.dom.element( other ) : null;

			if ( !( other && ( src.equals( other ) || src.contains( other ) ) ) )
				fn.call( this, evt );
		};
	}

	function hasBookmarks( element ) {
		// We use getElementsByTag() instead of find() to retain compatibility with IE quirks mode.
		var potentialBookmarks = element.getElementsByTag( 'span' ),
			i = 0,
			child;

		if ( potentialBookmarks ) {
			while ( ( child = potentialBookmarks.getItem( i++ ) ) ) {
				if ( !isNotBookmark( child ) ) {
					return true;
				}
			}
		}

		return false;
	}

	// Check if the entire table/list contents is selected.
	function getSelectedTableList( sel ) {
		var selected,
			range = sel.getRanges()[ 0 ],
			editable = sel.root,
			path = range.startPath(),
			structural = { table: 1, ul: 1, ol: 1, dl: 1 };

		if ( path.contains( structural ) ) {
			// Clone the original range.
			var walkerRng = range.clone();

			// Enlarge the range: X<ul><li>[Y]</li></ul>X => [X<ul><li>]Y</li></ul>X
			walkerRng.collapse( 1 );
			walkerRng.setStartAt( editable, CKEDITOR.POSITION_AFTER_START );

			// Create a new walker.
			var walker = new CKEDITOR.dom.walker( walkerRng );

			// Assign a new guard to the walker.
			walker.guard = guard();

			// Go backwards checking for selected structural node.
			walker.checkBackward();

			// If there's a selected structured element when checking backwards,
			// then check the same forwards.
			if ( selected ) {
				// Clone the original range.
				walkerRng = range.clone();

				// Enlarge the range (assuming <ul> is selected element from guard):
				//
				// 	   X<ul><li>[Y]</li></ul>X    =>    X<ul><li>Y[</li></ul>]X
				//
				// If the walker went deeper down DOM than a while ago when traversing
				// backwards, then it doesn't make sense: an element must be selected
				// symmetrically. By placing range end **after previously selected node**,
				// we make sure we don't go no deeper in DOM when going forwards.
				walkerRng.collapse();
				walkerRng.setEndAt( selected, CKEDITOR.POSITION_AFTER_END );

				// Create a new walker.
				walker = new CKEDITOR.dom.walker( walkerRng );

				// Assign a new guard to the walker.
				walker.guard = guard( true );

				// Reset selected node.
				selected = false;

				// Go forwards checking for selected structural node.
				walker.checkForward();

				return selected;
			}
		}

		return null;

		function guard( forwardGuard ) {
			return function( node, isWalkOut ) {
				// Save the encountered node as selected if going down the DOM structure
				// and the node is structured element.
				if ( isWalkOut && node.type == CKEDITOR.NODE_ELEMENT && node.is( structural ) )
					selected = node;

				// Stop the walker when either traversing another non-empty node at the same
				// DOM level as in previous step.
				// NOTE: When going forwards, stop if encountered a bogus.
				if ( !isWalkOut && isNotEmpty( node ) && !( forwardGuard && isBogus( node ) ) )
					return false;
			};
		}
	}

	// Whether in given context (pathBlock, pathBlockLimit and editor settings)
	// editor should automatically wrap inline contents with blocks.
	function shouldAutoParagraph( editor, pathBlock, pathBlockLimit ) {
		// Check whether pathBlock equals pathBlockLimit to support nested editable (https://dev.ckeditor.com/ticket/12162).
		return editor.config.autoParagraph !== false &&
			editor.activeEnterMode != CKEDITOR.ENTER_BR &&
			(
				( editor.editable().equals( pathBlockLimit ) && !pathBlock ) ||
				( pathBlock && pathBlock.getAttribute( 'contenteditable' ) == 'true' )
			);
	}

	function autoParagraphTag( editor ) {
		return ( editor.activeEnterMode != CKEDITOR.ENTER_BR && editor.config.autoParagraph !== false ) ? editor.activeEnterMode == CKEDITOR.ENTER_DIV ? 'div' : 'p' : false;
	}

	//
	// Functions related to insertXXX methods
	//
	insert = ( function() {
		'use strict';

		var DTD = CKEDITOR.dtd;

		// Inserts the given (valid) HTML into the range position (with range content deleted),
		// guarantee it's result to be a valid DOM tree.
		function insert( editable, type, data, range ) {
			var editor = editable.editor,
				dontFilter = false;

			if ( type == 'unfiltered_html' ) {
				type = 'html';
				dontFilter = true;
			}

			// Check range spans in non-editable.
			if ( range.checkReadOnly() )
				return;

			// RANGE PREPARATIONS

			var path = new CKEDITOR.dom.elementPath( range.startContainer, range.root ),
				// Let root be the nearest block that's impossible to be split
				// during html processing.
				blockLimit = path.blockLimit || range.root,
				// The "state" value.
				that = {
					type: type,
					dontFilter: dontFilter,
					editable: editable,
					editor: editor,
					range: range,
					blockLimit: blockLimit,
					// During pre-processing / preparations startContainer of affectedRange should be placed
					// in this element in which inserted or moved (in case when we merge blocks) content
					// could create situation that will need merging inline elements.
					// Examples:
					// <div><b>A</b>^B</div> + <b>C</b> => <div><b>A</b><b>C</b>B</div> - affected container is <div>.
					// <p><b>A[B</b></p><p><b>C]D</b></p> + E => <p><b>AE</b></p><p><b>D</b></p> =>
					//		<p><b>AE</b><b>D</b></p> - affected container is <p> (in text mode).
					mergeCandidates: [],
					zombies: []
				};

			prepareRangeToDataInsertion( that );

			if ( editor.getData() === '' && editor.enterMode === CKEDITOR.ENTER_DIV ) {
				clearEditable( editable, range );
			}

			// DATA PROCESSING

			// Select range and stop execution.
			// If data has been totally emptied after the filtering,
			// any insertion is pointless (https://dev.ckeditor.com/ticket/10339).
			if ( data && processDataForInsertion( that, data ) ) {
				// DATA INSERTION
				insertDataIntoRange( that );
			}

			// FINAL CLEANUP
			// Set final range position and clean up.

			cleanupAfterInsertion( that );
		}

		function clearEditable( editable, range ) {
			var first = editable.getFirst();
			first && first.remove();
			range.setStartAt( editable, CKEDITOR.POSITION_AFTER_START );
			range.collapse( true );
		}

		// Prepare range to its data deletion.
		// Delete its contents.
		// Prepare it to insertion.
		function prepareRangeToDataInsertion( that ) {
			var range = that.range,
				mergeCandidates = that.mergeCandidates,
				isHtml = that.type === 'html',
				node, marker, path, startPath, endPath, previous, bm, endNode;

			// If range starts in inline element then insert a marker, so empty
			// inline elements won't be removed while range.deleteContents
			// and we will be able to move range back into this element.
			// E.g. 'aa<b>[bb</b>]cc' -> (after deleting) 'aa<b><span/></b>cc'
			if ( that.type == 'text' && range.shrink( CKEDITOR.SHRINK_ELEMENT, true, false ) ) {
				marker = CKEDITOR.dom.element.createFromHtml( '<span>&nbsp;</span>', range.document );
				range.insertNode( marker );
				range.setStartAfter( marker );
			}

			// By using path we can recover in which element was startContainer
			// before deleting contents.
			// Start and endPathElements will be used to squash selected blocks, after removing
			// selection contents. See rule 5.
			startPath = new CKEDITOR.dom.elementPath( range.startContainer );
			that.endPath = endPath = new CKEDITOR.dom.elementPath( range.endContainer );

			if ( !range.collapsed ) {
				// Anticipate the possibly empty block at the end of range after deletion.
				node = endPath.block || endPath.blockLimit;
				var ancestor = range.getCommonAncestor();
				if ( node && !( node.equals( ancestor ) || node.contains( ancestor ) ) && range.checkEndOfBlock() ) {
					that.zombies.push( node );
				}

				range.deleteContents();
			}

			// Rule 4.
			// Move range into the previous block.
			while (
				( previous = getRangePrevious( range ) ) && checkIfElement( previous ) && previous.isBlockBoundary() &&
				// Check if previousNode was parent of range's startContainer before deleteContents.
				startPath.contains( previous )
			)
				range.moveToPosition( previous, CKEDITOR.POSITION_BEFORE_END );

			// Rule 5.
			mergeAncestorElementsOfSelectionEnds( range, that.blockLimit, startPath, endPath );

			// Rule 1.
			if ( marker ) {
				// If marker was created then move collapsed range into its place.
				range.setEndBefore( marker );
				range.collapse();
				marker.remove();
			}

			// Split inline elements so HTML will be inserted with its own styles.
			path = range.startPath();
			if ( ( node = path.contains( isInline, false, 1 ) ) ) {
				endNode = range.splitElement( node );
				that.inlineStylesRoot = node;
				that.inlineStylesPeak = path.lastElement;
			}

			// Record inline merging candidates for later cleanup in place.
			bm = range.createBookmark();

			// When called by insertHtml remove empty element created after splitting (#2813).
			if ( isHtml ) {
				removeEmptyInlineElement( node );
				removeEmptyInlineElement( endNode );
			}

			// 1. Inline siblings.
			node = bm.startNode.getPrevious( isNotEmpty );
			node && checkIfElement( node ) && isInline( node ) && mergeCandidates.push( node );
			node = bm.startNode.getNext( isNotEmpty );
			node && checkIfElement( node ) && isInline( node ) && mergeCandidates.push( node );

			// 2. Inline parents.
			node = bm.startNode;
			while ( ( node = node.getParent() ) && isInline( node ) ) {
				mergeCandidates.push( node );
			}

			range.moveToBookmark( bm );
		}

		function processDataForInsertion( that, data ) {
			var range = that.range;

			// Rule 8. - wrap entire data in inline styles.
			// (e.g. <p><b>x^z</b></p> + <p>a</p><p>b</p> -> <b><p>a</p><p>b</p></b>)
			// Incorrect tags order will be fixed by htmlDataProcessor.
			if ( that.type == 'text' && that.inlineStylesRoot )
				data = wrapDataWithInlineStyles( data, that );


			var context = that.blockLimit.getName();

			// Wrap data to be inserted, to avoid losing leading whitespaces
			// when going through the below procedure.
			if ( /^\s+|\s+$/.test( data ) && 'span' in CKEDITOR.dtd[ context ] ) {
				var protect = '<span data-cke-marker="1">&nbsp;</span>';
				data =  protect + data + protect;
			}

			// Process the inserted html, in context of the insertion root.
			// Don't use the "fix for body" feature as auto paragraphing must
			// be handled during insertion.
			data = that.editor.dataProcessor.toHtml( data, {
				context: null,
				fixForBody: false,
				protectedWhitespaces: !!protect,
				dontFilter: that.dontFilter,
				// Use the current, contextual settings.
				filter: that.editor.activeFilter,
				enterMode: that.editor.activeEnterMode
			} );


			// Build the node list for insertion.
			var doc = range.document,
				wrapper = doc.createElement( 'body' );

			wrapper.setHtml( data );

			// Eventually remove the temporaries.
			if ( protect ) {
				wrapper.getFirst().remove();
				wrapper.getLast().remove();
			}

			// Rule 7.
			var block = range.startPath().block;
			if ( block &&													// Apply when there exists path block after deleting selection's content...
				!( block.getChildCount() == 1 && block.getBogus() ) ) {		// ... and the only content of this block isn't a bogus.
				stripBlockTagIfSingleLine( wrapper );
			}

			that.dataWrapper = wrapper;

			return data;
		}

		function insertDataIntoRange( that ) {
			var range = that.range,
				doc = range.document,
				path,
				blockLimit = that.blockLimit,
				nodesData, nodeData, node,
				nodeIndex = 0,
				bogus,
				bogusNeededBlocks = [],
				pathBlock, fixBlock,
				splittingContainer = 0,
				dontMoveCaret = 0,
				insertionContainer, toSplit, newContainer,
				startContainer = range.startContainer,
				endContainer = that.endPath.elements[ 0 ],
				filteredNodes,
				// If endContainer was merged into startContainer: <p>a[b</p><p>c]d</p>
				// or it's equal to startContainer: <p>a^b</p>
				// or different situation happened :P
				// then there's no separate container for the end of selection.
				pos = endContainer.getPosition( startContainer ),
				separateEndContainer = !!endContainer.getCommonAncestor( startContainer ) && // endC is not detached.
					pos != CKEDITOR.POSITION_IDENTICAL && !( pos & CKEDITOR.POSITION_CONTAINS + CKEDITOR.POSITION_IS_CONTAINED ); // endC & endS are in separate branches.

			nodesData = extractNodesData( that.dataWrapper, that );

			removeBrsAdjacentToPastedBlocks( nodesData, range );

			for ( ; nodeIndex < nodesData.length; nodeIndex++ ) {
				nodeData = nodesData[ nodeIndex ];

				// Ignore trailing <brs>
				if ( nodeData.isLineBreak && splitOnLineBreak( range, blockLimit, nodeData ) ) {
					// Do not move caret towards the text (in cleanupAfterInsertion),
					// because caret was placed after a line break.
					dontMoveCaret = nodeIndex > 0;
					continue;
				}

				path = range.startPath();

				// Auto paragraphing.
				if ( !nodeData.isBlock && shouldAutoParagraph( that.editor, path.block, path.blockLimit ) && ( fixBlock = autoParagraphTag( that.editor ) ) ) {
					fixBlock = doc.createElement( fixBlock );
					fixBlock.appendBogus();
					range.insertNode( fixBlock );
					if ( CKEDITOR.env.needsBrFiller && ( bogus = fixBlock.getBogus() ) )
						bogus.remove();
					range.moveToPosition( fixBlock, CKEDITOR.POSITION_BEFORE_END );
				}

				node = range.startPath().block;

				// Remove any bogus element on the current path block for now, and mark
				// it for later compensation.
				if ( node && !node.equals( pathBlock ) ) {
					bogus = node.getBogus();
					if ( bogus ) {
						bogus.remove();
						bogusNeededBlocks.push( node );
					}

					pathBlock = node;
				}

				// First not allowed node reached - start splitting original container
				if ( nodeData.firstNotAllowed )
					splittingContainer = 1;

				if ( splittingContainer && nodeData.isElement ) {
					insertionContainer = range.startContainer;
					toSplit = null;

					// Find the first ancestor that can contain current node.
					// This one won't be split.
					while ( insertionContainer && !DTD[ insertionContainer.getName() ][ nodeData.name ] ) {
						if ( insertionContainer.equals( blockLimit ) ) {
							insertionContainer = null;
							break;
						}

						toSplit = insertionContainer;
						insertionContainer = insertionContainer.getParent();
					}

					// If split has to be done - do it and mark both ends as a possible zombies.
					if ( insertionContainer ) {
						if ( toSplit ) {
							newContainer = range.splitElement( toSplit );
							that.zombies.push( newContainer );
							that.zombies.push( toSplit );
						}
					}
					// Unable to make the insertion happen in place, resort to the content filter.
					else {
						// If everything worked fine insertionContainer == blockLimit here.
						filteredNodes = filterElement( nodeData.node, blockLimit.getName(), !nodeIndex, nodeIndex == nodesData.length - 1 );
					}
				}

				if ( filteredNodes ) {
					while ( ( node = filteredNodes.pop() ) )
						range.insertNode( node );
					filteredNodes = 0;
				} else {
					// Insert current node at the start of range.
					range.insertNode( nodeData.node );
				}

				// Move range to the endContainer for the final allowed elements.
				if ( nodeData.lastNotAllowed && nodeIndex < nodesData.length - 1 ) {
					// If separateEndContainer exists move range there.
					// Otherwise try to move range to container created during splitting.
					// If this doesn't work - don't move range.
					newContainer = separateEndContainer ? endContainer : newContainer;
					newContainer && range.setEndAt( newContainer, CKEDITOR.POSITION_AFTER_START );
					splittingContainer = 0;
				}

				// Collapse range after insertion to end.
				range.collapse();
			}

			// Rule 9. Non-editable content should be selected as a whole.
			if ( isSingleNonEditableElement( nodesData ) ) {
				dontMoveCaret = true;
				node = nodesData[ 0 ].node;
				range.setStartAt( node, CKEDITOR.POSITION_BEFORE_START );
				range.setEndAt( node, CKEDITOR.POSITION_AFTER_END );
			}

			that.dontMoveCaret = dontMoveCaret;
			that.bogusNeededBlocks = bogusNeededBlocks;
		}

		function cleanupAfterInsertion( that ) {
			var range = that.range,
				node, testRange, movedIntoInline,
				bogusNeededBlocks = that.bogusNeededBlocks,
				// Create a bookmark to defend against the following range deconstructing operations.
				bm = range.createBookmark();

			// Remove all elements that could be created while splitting nodes
			// with ranges at its start|end.
			// E.g. remove <div><p></p></div>
			// But not <div><p> </p></div>
			// And replace <div><p><span data="cke-bookmark"/></p></div> with found bookmark.
			while ( ( node = that.zombies.pop() ) ) {
				// Detached element.
				if ( !node.getParent() )
					continue;

				testRange = range.clone();
				testRange.moveToElementEditStart( node );
				testRange.removeEmptyBlocksAtEnd();
			}

			if ( bogusNeededBlocks ) {
				// Bring back all block bogus nodes.
				while ( ( node = bogusNeededBlocks.pop() ) ) {
					if ( CKEDITOR.env.needsBrFiller )
						node.appendBogus();
					else
						node.append( range.document.createText( '\u00a0' ) );
				}
			}

			// Eventually merge identical inline elements.
			while ( ( node = that.mergeCandidates.pop() ) )
				node.mergeSiblings();

			range.moveToBookmark( bm );

			// Rule 3.
			// Shrink range to the BEFOREEND of previous innermost editable node in source order.

			if ( !that.dontMoveCaret ) {
				node = getRangePrevious( range );

				while ( node && checkIfElement( node ) && !node.is( DTD.$empty ) ) {
					if ( node.isBlockBoundary() )
						range.moveToPosition( node, CKEDITOR.POSITION_BEFORE_END );
					else {
						// Don't move into inline element (which ends with a text node)
						// found which contains white-space at its end.
						// If not - move range's end to the end of this element.
						if ( isInline( node ) && node.getHtml().match( /(\s|&nbsp;)$/g ) ) {
							movedIntoInline = null;
							break;
						}

						movedIntoInline = range.clone();
						movedIntoInline.moveToPosition( node, CKEDITOR.POSITION_BEFORE_END );
					}

					node = node.getLast( isNotEmpty );
				}

				movedIntoInline && range.moveToRange( movedIntoInline );
			}

		}

		//
		// HELPERS ------------------------------------------------------------
		//

		function checkIfElement( node ) {
			return node.type == CKEDITOR.NODE_ELEMENT;
		}

		function extractNodesData( dataWrapper, that ) {
			var node, sibling, nodeName, allowed,
				nodesData = [],
				startContainer = that.range.startContainer,
				path = that.range.startPath(),
				allowedNames = DTD[ startContainer.getName() ],
				nodeIndex = 0,
				nodesList = dataWrapper.getChildren(),
				nodesCount = nodesList.count(),
				firstNotAllowed = -1,
				lastNotAllowed = -1,
				lineBreak = 0,
				blockSibling;

			// Selection start within a list.
			var insideOfList = path.contains( DTD.$list );

			for ( ; nodeIndex < nodesCount; ++nodeIndex ) {
				node = nodesList.getItem( nodeIndex );

				if ( checkIfElement( node ) ) {
					nodeName = node.getName();

					// Extract only the list items, when insertion happens
					// inside of a list, reads as rearrange list items. (https://dev.ckeditor.com/ticket/7957)
					if ( insideOfList && nodeName in CKEDITOR.dtd.$list ) {
						nodesData = nodesData.concat( extractNodesData( node, that ) );
						continue;
					}

					allowed = !!allowedNames[ nodeName ];

					// Mark <brs data-cke-eol="1"> at the beginning and at the end.
					if ( nodeName == 'br' && node.data( 'cke-eol' ) && ( !nodeIndex || nodeIndex == nodesCount - 1 ) ) {
						sibling = nodeIndex ? nodesData[ nodeIndex - 1 ].node : nodesList.getItem( nodeIndex + 1 );

						// Line break has to have sibling which is not an <br>.
						lineBreak = sibling && ( !checkIfElement( sibling ) || !sibling.is( 'br' ) );
						// Line break has block element as a sibling.
						blockSibling = sibling && checkIfElement( sibling ) && DTD.$block[ sibling.getName() ];
					}

					if ( firstNotAllowed == -1 && !allowed )
						firstNotAllowed = nodeIndex;
					if ( !allowed )
						lastNotAllowed = nodeIndex;

					nodesData.push( {
						isElement: 1,
						isLineBreak: lineBreak,
						isBlock: node.isBlockBoundary(),
						hasBlockSibling: blockSibling,
						node: node,
						name: nodeName,
						allowed: allowed
					} );

					lineBreak = 0;
					blockSibling = 0;
				} else {
					nodesData.push( { isElement: 0, node: node, allowed: 1 } );
				}
			}

			// Mark first node that cannot be inserted directly into startContainer
			// and last node for which startContainer has to be split.
			if ( firstNotAllowed > -1 )
				nodesData[ firstNotAllowed ].firstNotAllowed = 1;
			if ( lastNotAllowed > -1 )
				nodesData[ lastNotAllowed ].lastNotAllowed = 1;

			return nodesData;
		}

		// TODO: Review content transformation rules on filtering element.
		function filterElement( element, parentName, isFirst, isLast ) {
			var nodes = filterElementInner( element, parentName ),
				nodes2 = [],
				nodesCount = nodes.length,
				nodeIndex = 0,
				node,
				afterSpace = 0,
				lastSpaceIndex = -1;

			// Remove duplicated spaces and spaces at the:
			// * beginnig if filtered element isFirst (isFirst that's going to be inserted)
			// * end if filtered element isLast.
			for ( ; nodeIndex < nodesCount; nodeIndex++ ) {
				node = nodes[ nodeIndex ];

				if ( node == ' ' ) {
					// Don't push doubled space and if it's leading space for insertion.
					if ( !afterSpace && !( isFirst && !nodeIndex ) ) {
						nodes2.push( new CKEDITOR.dom.text( ' ' ) );
						lastSpaceIndex = nodes2.length;
					}
					afterSpace = 1;
				} else {
					nodes2.push( node );
					afterSpace = 0;
				}
			}

			// Remove trailing space.
			if ( isLast && lastSpaceIndex == nodes2.length )
				nodes2.pop();

			return nodes2;
		}

		function filterElementInner( element, parentName ) {
			var nodes = [],
				children = element.getChildren(),
				childrenCount = children.count(),
				child,
				childIndex = 0,
				allowedNames = DTD[ parentName ],
				surroundBySpaces = !element.is( DTD.$inline ) || element.is( 'br' );

			if ( surroundBySpaces )
				nodes.push( ' ' );

			for ( ; childIndex < childrenCount; childIndex++ ) {
				child = children.getItem( childIndex );

				if ( checkIfElement( child ) && !child.is( allowedNames ) )
					nodes = nodes.concat( filterElementInner( child, parentName ) );
				else
					nodes.push( child );
			}

			if ( surroundBySpaces )
				nodes.push( ' ' );

			return nodes;
		}

		function getRangePrevious( range ) {
			return checkIfElement( range.startContainer ) && range.startContainer.getChild( range.startOffset - 1 );
		}

		function isInline( node ) {
			return node && checkIfElement( node ) && ( node.is( DTD.$removeEmpty ) || node.is( 'a' ) && !node.isBlockBoundary() );
		}

		// Checks if only non-editable element is being inserted.
		function isSingleNonEditableElement( nodesData ) {
			if ( nodesData.length != 1 )
				return false;

			var nodeData = nodesData[ 0 ];

			return nodeData.isElement && ( nodeData.node.getAttribute( 'contenteditable' ) == 'false' );
		}

		var blockMergedTags = { p: 1, div: 1, h1: 1, h2: 1, h3: 1, h4: 1, h5: 1, h6: 1, ul: 1, ol: 1, li: 1, pre: 1, dl: 1, blockquote: 1 };

		// See rule 5. in TCs.
		// Initial situation:
		// <ul><li>AA^</li></ul><ul><li>BB</li></ul>
		// We're looking for 2nd <ul>, comparing with 1st <ul> and merging.
		// We're not merging if caret is between these elements.
		function mergeAncestorElementsOfSelectionEnds( range, blockLimit, startPath, endPath ) {
			var walkerRange = range.clone(),
				walker, nextNode, previousNode;

			walkerRange.setEndAt( blockLimit, CKEDITOR.POSITION_BEFORE_END );
			walker = new CKEDITOR.dom.walker( walkerRange );

			if ( ( nextNode = walker.next() ) &&							// Find next source node
				checkIfElement( nextNode ) &&								// which is an element
				blockMergedTags[ nextNode.getName() ] &&					// that can be merged.
				( previousNode = nextNode.getPrevious() ) &&				// Take previous one
				checkIfElement( previousNode ) &&							// which also has to be an element.
				!previousNode.getParent().equals( range.startContainer ) && // Fail if caret is on the same level.
																			// This means that caret is between these nodes.
				startPath.contains( previousNode ) &&						// Elements path of start of selection has
				endPath.contains( nextNode ) &&								// to contain prevNode and vice versa.
				nextNode.isIdentical( previousNode )						// Check if elements are identical.
			) {
				// Merge blocks and repeat.
				nextNode.moveChildren( previousNode );
				nextNode.remove();
				mergeAncestorElementsOfSelectionEnds( range, blockLimit, startPath, endPath );
			}
		}

		// If last node that will be inserted is a block (but not a <br>)
		// and it will be inserted right before <br> remove this <br>.
		// Do the same for the first element that will be inserted and preceding <br>.
		function removeBrsAdjacentToPastedBlocks( nodesData, range ) {
			var succeedingNode = range.endContainer.getChild( range.endOffset ),
				precedingNode = range.endContainer.getChild( range.endOffset - 1 );

			if ( succeedingNode )
				remove( succeedingNode, nodesData[ nodesData.length - 1 ] );

			if ( precedingNode && remove( precedingNode, nodesData[ 0 ] ) ) {
				// If preceding <br> was removed - move range left.
				range.setEnd( range.endContainer, range.endOffset - 1 );
				range.collapse();
			}

			function remove( maybeBr, maybeBlockData ) {
				if ( maybeBlockData.isBlock && maybeBlockData.isElement && !maybeBlockData.node.is( 'br' ) &&
					checkIfElement( maybeBr ) && maybeBr.is( 'br' ) ) {
					maybeBr.remove();
					return 1;
				}
			}
		}

		// Return 1 if <br> should be skipped when inserting, 0 otherwise.
		function splitOnLineBreak( range, blockLimit, nodeData ) {
			var firstBlockAscendant, pos;

			if ( nodeData.hasBlockSibling )
				return 1;

			firstBlockAscendant = range.startContainer.getAscendant( DTD.$block, 1 );
			if ( !firstBlockAscendant || !firstBlockAscendant.is( { div: 1, p: 1 } ) )
				return 0;

			pos = firstBlockAscendant.getPosition( blockLimit );

			if ( pos == CKEDITOR.POSITION_IDENTICAL || pos == CKEDITOR.POSITION_CONTAINS )
				return 0;

			var newContainer = range.splitElement( firstBlockAscendant );
			range.moveToPosition( newContainer, CKEDITOR.POSITION_AFTER_START );

			return 1;
		}

		var stripSingleBlockTags = { p: 1, div: 1, h1: 1, h2: 1, h3: 1, h4: 1, h5: 1, h6: 1 },
			inlineButNotBr = CKEDITOR.tools.extend( {}, DTD.$inline );
		delete inlineButNotBr.br;

		// Rule 7.
		function stripBlockTagIfSingleLine( dataWrapper ) {
			var block, children;

			if ( dataWrapper.getChildCount() == 1 &&					// Only one node bein inserted.
				checkIfElement( block = dataWrapper.getFirst() ) &&		// And it's an element.
				block.is( stripSingleBlockTags ) &&						// That's <p> or <div> or header.
				!block.hasAttribute( 'contenteditable' )				// It's not a non-editable block or nested editable.
			) {
				// Check children not containing block.
				children = block.getElementsByTag( '*' );
				for ( var i = 0, child, count = children.count(); i < count; i++ ) {
					child = children.getItem( i );
					if ( !child.is( inlineButNotBr ) )
						return;
				}

				block.moveChildren( block.getParent( 1 ) );
				block.remove();
			}
		}

		function wrapDataWithInlineStyles( data, that ) {
			var element = that.inlineStylesPeak,
				doc = element.getDocument(),
				wrapper = doc.createText( '{cke-peak}' ),
				limit = that.inlineStylesRoot.getParent();

			while ( !element.equals( limit ) ) {
				wrapper = wrapper.appendTo( element.clone() );
				element = element.getParent();
			}

			// Don't use String.replace because it fails in IE7 if special replacement
			// characters ($$, $&, etc.) are in data (https://dev.ckeditor.com/ticket/10367).
			return wrapper.getOuterHtml().split( '{cke-peak}' ).join( data );
		}

		return insert;
	} )();

	function removeEmptyInlineElement( element ) {
		if ( element && element.isEmptyInlineRemoveable() ) {
			element.remove();
		}
	}

	function afterInsert( editable ) {
		var editor = editable.editor;

		// Scroll using selection, not ranges, to affect native pastes.
		editor.getSelection().scrollIntoView();

		// Save snaps after the whole execution completed.
		// This's a workaround for make DOM modification's happened after
		// 'insertElement' to be included either, e.g. Form-based dialogs' 'commitContents'
		// call.
		setTimeout( function() {
			editor.fire( 'saveSnapshot' );
		}, 0 );
	}

	// 1. Fixes a range which is a result of deleteContents() and is placed in an intermediate element (see dtd.$intermediate),
	// inside a table. A goal is to find a closest <td> or <th> element and when this fails, recreate the structure of the table.
	// 2. Fixes empty cells by appending bogus <br>s or deleting empty text nodes in IE<=8 case.
	fixTableAfterContentsDeletion = ( function() {
		// Creates an element walker which can only "go deeper". It won't
		// move out from any element. Therefore it can be used to find <td>x</td> in cases like:
		// <table><tbody><tr><td>x</td></tr></tbody>^<tfoot>...
		function getFixTableSelectionWalker( testRange ) {
			var walker = new CKEDITOR.dom.walker( testRange );
			walker.guard = function( node, isMovingOut ) {
				if ( isMovingOut )
					return false;
				if ( node.type == CKEDITOR.NODE_ELEMENT )
					return node.is( CKEDITOR.dtd.$tableContent );
			};
			walker.evaluator = function( node ) {
				return node.type == CKEDITOR.NODE_ELEMENT;
			};

			return walker;
		}

		function fixTableStructure( element, newElementName, appendToStart ) {
			var temp = element.getDocument().createElement( newElementName );
			element.append( temp, appendToStart );
			return temp;
		}

		// Fix empty cells. This means:
		// * add bogus <br> if browser needs it
		// * remove empty text nodes on IE8, because it will crash (https://dev.ckeditor.com/ticket/11183#comment:8).
		function fixEmptyCells( cells ) {
			var i = cells.count(),
				cell;

			for ( i; i-- > 0; ) {
				cell = cells.getItem( i );

				if ( !CKEDITOR.tools.trim( cell.getHtml() ) ) {
					cell.appendBogus();
					if ( CKEDITOR.env.ie && CKEDITOR.env.version < 9 && cell.getChildCount() )
						cell.getFirst().remove();
				}
			}
		}

		return function( range ) {
			var container = range.startContainer,
				table = container.getAscendant( 'table', 1 ),
				testRange,
				deeperSibling,
				appendToStart = false;

			fixEmptyCells( table.getElementsByTag( 'td' ) );
			fixEmptyCells( table.getElementsByTag( 'th' ) );

			// Look left.
			testRange = range.clone();
			testRange.setStart( container, 0 );
			deeperSibling = getFixTableSelectionWalker( testRange ).lastBackward();

			// If left is empty, look right.
			if ( !deeperSibling ) {
				testRange = range.clone();
				testRange.setEndAt( container, CKEDITOR.POSITION_BEFORE_END );
				deeperSibling = getFixTableSelectionWalker( testRange ).lastForward();
				appendToStart = true;
			}

			// If there's no deeper nested element in both direction - container is empty - we'll use it then.
			if ( !deeperSibling )
				deeperSibling = container;

			// Fix structure...

			// We found a table what means that it's empty - remove it completely.
			if ( deeperSibling.is( 'table' ) ) {
				range.setStartAt( deeperSibling, CKEDITOR.POSITION_BEFORE_START );
				range.collapse( true );
				deeperSibling.remove();
				return;
			}

			// Found an empty txxx element - append tr.
			if ( deeperSibling.is( { tbody: 1, thead: 1, tfoot: 1 } ) )
				deeperSibling = fixTableStructure( deeperSibling, 'tr', appendToStart );

			// Found an empty tr element - append td/th.
			if ( deeperSibling.is( 'tr' ) )
				deeperSibling = fixTableStructure( deeperSibling, deeperSibling.getParent().is( 'thead' ) ? 'th' : 'td', appendToStart );

			// To avoid setting selection after bogus, remove it from the current cell.
			// We can safely do that, because we'll insert element into that cell.
			var bogus = deeperSibling.getBogus();
			if ( bogus )
				bogus.remove();

			range.moveToPosition( deeperSibling, appendToStart ? CKEDITOR.POSITION_AFTER_START : CKEDITOR.POSITION_BEFORE_END );
		};
	} )();

	fixListAfterContentsDelete = ( function() {
		// Creates an element walker which operates only within lists.
		function getFixListSelectionWalker( testRange ) {
			var walker = new CKEDITOR.dom.walker( testRange );
			walker.guard = function( node, isMovingOut ) {
				if ( isMovingOut )
					return false;
				if ( node.type == CKEDITOR.NODE_ELEMENT )
					return node.is( CKEDITOR.dtd.$list ) || node.is( CKEDITOR.dtd.$listItem );
			};
			walker.evaluator = function( node ) {
				return node.type == CKEDITOR.NODE_ELEMENT && node.is( CKEDITOR.dtd.$listItem );
			};

			return walker;
		}

		return function( range ) {
			var container = range.startContainer,
				appendToStart = false,
				testRange,
				deeperSibling;

			// Look left.
			testRange = range.clone();
			testRange.setStart( container, 0 );
			deeperSibling = getFixListSelectionWalker( testRange ).lastBackward();

			// If left is empty, look right.
			if ( !deeperSibling ) {
				testRange = range.clone();
				testRange.setEndAt( container, CKEDITOR.POSITION_BEFORE_END );
				deeperSibling = getFixListSelectionWalker( testRange ).lastForward();
				appendToStart = true;
			}

			// If there's no deeper nested element in both direction - container is empty - we'll use it then.
			if ( !deeperSibling )
				deeperSibling = container;

			// We found a list what means that it's empty - remove it completely.
			if ( deeperSibling.is( CKEDITOR.dtd.$list ) ) {
				range.setStartAt( deeperSibling, CKEDITOR.POSITION_BEFORE_START );
				range.collapse( true );
				deeperSibling.remove();
				return;
			}

			// To avoid setting selection after bogus, remove it from the target list item.
			// We can safely do that, because we'll insert element into that cell.
			var bogus = deeperSibling.getBogus();
			if ( bogus )
				bogus.remove();

			range.moveToPosition( deeperSibling, appendToStart ? CKEDITOR.POSITION_AFTER_START : CKEDITOR.POSITION_BEFORE_END );
			range.select();
		};
	} )();

	function mergeBlocksCollapsedSelection( editor, range, backspace, startPath ) {
		var startBlock = startPath.block;

		// Selection must be collapsed and to be anchored in a block.
		if ( !startBlock )
			return false;

		// Exclude cases where, i.e. if pressed arrow key, selection
		// would move within the same block (merge inside a block).
		if ( !range[ backspace ? 'checkStartOfBlock' : 'checkEndOfBlock' ]() )
			return false;

		// Make sure, there's an editable position to put selection,
		// which i.e. would be used if pressed arrow key, but abort
		// if such position exists but means a selected non-editable element.
		if ( !range.moveToClosestEditablePosition( startBlock, !backspace ) || !range.collapsed )
			return false;

		// Handle special case, when block's sibling is a <hr>. Delete it and keep selection
		// in the same place (https://dev.ckeditor.com/ticket/11861#comment:9).
		if ( range.startContainer.type == CKEDITOR.NODE_ELEMENT ) {
			var touched = range.startContainer.getChild( range.startOffset - ( backspace ? 1 : 0 ) );
			if ( touched && touched.type  == CKEDITOR.NODE_ELEMENT && touched.is( 'hr' ) ) {
				editor.fire( 'saveSnapshot' );
				touched.remove();
				return true;
			}
		}

		var siblingBlock = range.startPath().block;

		// Abort if an editable position exists, but either it's not
		// in a block or that block is the parent of the start block
		// (merging child into parent).
		if ( !siblingBlock || ( siblingBlock && siblingBlock.contains( startBlock ) ) )
			return;

		editor.fire( 'saveSnapshot' );

		// Remove bogus to avoid duplicated boguses.
		var bogus;
		if ( ( bogus = ( backspace ? siblingBlock : startBlock ).getBogus() ) )
			bogus.remove();

		// Save selection. It will be restored.
		var selection = editor.getSelection(),
			bookmarks = selection.createBookmarks();

		// Merge blocks.
		( backspace ? startBlock : siblingBlock ).moveChildren( backspace ? siblingBlock : startBlock, false );

		// Also merge children along with parents.
		startPath.lastElement.mergeSiblings();

		// Cut off removable branch of the DOM tree.
		pruneEmptyDisjointAncestors( startBlock, siblingBlock, !backspace );

		// Restore selection.
		selection.selectBookmarks( bookmarks );

		return true;
	}

	function mergeBlocksNonCollapsedSelection( editor, range, startPath ) {
		var startBlock = startPath.block,
			endPath = range.endPath(),
			endBlock = endPath.block;

		// Selection must be anchored in two different blocks.
		if ( !startBlock || !endBlock || startBlock.equals( endBlock ) )
			return false;

		editor.fire( 'saveSnapshot' );

		// Remove bogus to avoid duplicated boguses.
		var bogus;
		if ( ( bogus = startBlock.getBogus() ) )
			bogus.remove();

		// Changing end container to element from text node (https://dev.ckeditor.com/ticket/12503).
		range.enlarge( CKEDITOR.ENLARGE_INLINE );

		// Delete range contents. Do NOT merge. Merging is weird.
		range.deleteContents();

		// If something has left of the block to be merged, clean it up.
		// It may happen when merging with list items.
		if ( endBlock.getParent() ) {
			// Move children to the first block.
			endBlock.moveChildren( startBlock, false );

			// ...and merge them if that's possible.
			startPath.lastElement.mergeSiblings();

			// If expanded selection, things are always merged like with BACKSPACE.
			pruneEmptyDisjointAncestors( startBlock, endBlock, true );
		}

		// Make sure the result selection is collapsed.
		range = editor.getSelection().getRanges()[ 0 ];
		range.collapse( 1 );

		// Optimizing range containers from text nodes to elements (https://dev.ckeditor.com/ticket/12503).
		range.optimize();
		if ( range.startContainer.getHtml() === '' ) {
			range.startContainer.appendBogus();
		}

		range.select();

		return true;
	}

	// Finds the innermost child of common parent, which,
	// if removed, removes nothing but the contents of the element.
	//
	//	before: <div><p><strong>first</strong></p><p>second</p></div>
	//	after:  <div><p>second</p></div>
	//
	//	before: <div><p>x<strong>first</strong></p><p>second</p></div>
	//	after:  <div><p>x</p><p>second</p></div>
	//
	//	isPruneToEnd=true
	//	before: <div><p><strong>first</strong></p><p>second</p></div>
	//	after:  <div><p><strong>first</strong></p></div>
	//
	// @param {CKEDITOR.dom.element} first
	// @param {CKEDITOR.dom.element} second
	// @param {Boolean} isPruneToEnd
	function pruneEmptyDisjointAncestors( first, second, isPruneToEnd ) {
		var commonParent = first.getCommonAncestor( second ),
			node = isPruneToEnd ? second : first,
			removableParent = node;

		while ( ( node = node.getParent() ) && !commonParent.equals( node ) && node.getChildCount() == 1 )
			removableParent = node;

		removableParent.remove();
	}

	//
	// Helpers for editable.getHtmlFromRange.
	//
	getHtmlFromRangeHelpers = {
		eol: {
			detect: function( that, editable ) {
				var range = that.range,
					rangeStart = range.clone(),
					rangeEnd = range.clone(),

					startPath = new CKEDITOR.dom.elementPath( range.startContainer, editable ),
					endPath = new CKEDITOR.dom.elementPath( range.endContainer, editable );

				// Note: checkBoundaryOfElement will not work on original range as CKEDITOR.START|END
				// means that range start|end must be literally anchored at block start|end, e.g.
				//
				// 		<p>a{</p><p>}b</p>
				//
				// will return false for both paragraphs but two similar ranges
				//
				// 		<p>a{}</p><p>{}b</p>
				//
				// will return true if checked separately.
				rangeStart.collapse( 1 );
				rangeEnd.collapse();

				if ( startPath.block && rangeStart.checkBoundaryOfElement( startPath.block, CKEDITOR.END ) ) {
					range.setStartAfter( startPath.block );
					that.prependEolBr = 1;
				}

				if ( endPath.block && rangeEnd.checkBoundaryOfElement( endPath.block, CKEDITOR.START ) ) {
					range.setEndBefore( endPath.block );
					that.appendEolBr = 1;
				}
			},

			fix: function( that, editable ) {
				var doc = editable.getDocument(),
					appended;

				// Append <br data-cke-eol="1"> to the fragment.
				if ( that.appendEolBr ) {
					appended = this.createEolBr( doc );
					that.fragment.append( appended );
				}

				// Prepend <br data-cke-eol="1"> to the fragment but avoid duplicates. Such
				// elements should never follow each other in DOM.
				if ( that.prependEolBr && ( !appended || appended.getPrevious() ) ) {
					that.fragment.append( this.createEolBr( doc ), 1 );
				}
			},

			createEolBr: function( doc ) {
				return doc.createElement( 'br', {
					attributes: {
						'data-cke-eol': 1
					}
				} );
			}
		},

		bogus: {
			exclude: function( that ) {
				var boundaryNodes = that.range.getBoundaryNodes(),
					startNode = boundaryNodes.startNode,
					endNode = boundaryNodes.endNode;

				// If bogus is the last node in range but not the only node, exclude it.
				if ( endNode && isBogus( endNode ) && ( !startNode || !startNode.equals( endNode ) ) )
					that.range.setEndBefore( endNode );
			}
		},

		tree: {
			rebuild: function( that, editable ) {
				var range = that.range,
					node = range.getCommonAncestor(),

					// A path relative to the common ancestor.
					commonPath = new CKEDITOR.dom.elementPath( node, editable ),
					startPath = new CKEDITOR.dom.elementPath( range.startContainer, editable ),
					endPath = new CKEDITOR.dom.elementPath( range.endContainer, editable ),
					limit;

				if ( node.type == CKEDITOR.NODE_TEXT )
					node = node.getParent();

				// Fix DOM of partially enclosed tables
				// 		<table><tbody><tr><td>a{b</td><td>c}d</td></tr></tbody></table>
				// Full table is returned
				// 		<table><tbody><tr><td>b</td><td>c</td></tr></tbody></table>
				// instead of
				// 		<td>b</td><td>c</td>
				if ( commonPath.blockLimit.is( { tr: 1, table: 1 } ) ) {
					var tableParent = commonPath.contains( 'table' ).getParent();

					limit = function( node ) {
						return !node.equals( tableParent );
					};
				}

				// Fix DOM in the following case
				// 		<ol><li>a{b<ul><li>c}d</li></ul></li></ol>
				// Full list is returned
				// 		<ol><li>b<ul><li>c</li></ul></li></ol>
				// instead of
				// 		b<ul><li>c</li></ul>
				else if ( commonPath.block && commonPath.block.is( CKEDITOR.dtd.$listItem ) ) {
					var startList = startPath.contains( CKEDITOR.dtd.$list ),
						endList = endPath.contains( CKEDITOR.dtd.$list );

					if ( !startList.equals( endList ) ) {
						var listParent = commonPath.contains( CKEDITOR.dtd.$list ).getParent();

						limit = function( node ) {
							return !node.equals( listParent );
						};
					}
				}

				// If not defined, use generic limit function.
				if ( !limit ) {
					limit = function( node ) {
						return !node.equals( commonPath.block ) && !node.equals( commonPath.blockLimit );
					};
				}

				this.rebuildFragment( that, editable, node, limit );
			},

			rebuildFragment: function( that, editable, node, checkLimit ) {
				var clone;

				while ( node && !node.equals( editable ) && checkLimit( node ) ) {
					// Don't clone children. Preserve element ids.
					clone = node.clone( 0, 1 );
					that.fragment.appendTo( clone );
					that.fragment = clone;

					node = node.getParent();
				}
			}
		},

		cell: {
			// Handle range anchored in table row with a single cell enclosed:
			// 		<table><tbody><tr>[<td>a</td>]</tr></tbody></table>
			// becomes
			// 		<table><tbody><tr><td>{a}</td></tr></tbody></table>
			shrink: function( that ) {
				var range = that.range,
					startContainer = range.startContainer,
					endContainer = range.endContainer,
					startOffset = range.startOffset,
					endOffset = range.endOffset;

				if ( startContainer.type == CKEDITOR.NODE_ELEMENT && startContainer.equals( endContainer ) && startContainer.is( 'tr' ) && ++startOffset == endOffset ) {
					range.shrink( CKEDITOR.SHRINK_TEXT );
				}
			}
		}
	};

	//
	// Helpers for editable.extractHtmlFromRange.
	//
	extractHtmlFromRangeHelpers = ( function() {
		function optimizeBookmarkNode( node, toStart ) {
			var parent = node.getParent();

			if ( parent.is( CKEDITOR.dtd.$inline ) )
				node[ toStart ? 'insertBefore' : 'insertAfter' ]( parent );
		}

		function mergeElements( merged, startBookmark, endBookmark ) {
			optimizeBookmarkNode( startBookmark );
			optimizeBookmarkNode( endBookmark, 1 );

			var next;
			while ( ( next = endBookmark.getNext() ) ) {
				next.insertAfter( startBookmark );

				// Update startBookmark after insertion to avoid the reversal of nodes (https://dev.ckeditor.com/ticket/13449).
				startBookmark = next;
			}

			if ( isEmpty( merged ) )
				merged.remove();
		}

		function getPath( startElement, root ) {
			return new CKEDITOR.dom.elementPath( startElement, root );
		}

		// Creates a range from a bookmark without removing the bookmark.
		function createRangeFromBookmark( root, bookmark ) {
			var range = new CKEDITOR.dom.range( root );
			range.setStartAfter( bookmark.startNode );
			range.setEndBefore( bookmark.endNode );
			return range;
		}

		var list = {
			detectMerge: function( that, editable ) {
				var range = createRangeFromBookmark( editable, that.bookmark ),
					startPath = range.startPath(),
					endPath = range.endPath(),

					startList = startPath.contains( CKEDITOR.dtd.$list ),
					endList = endPath.contains( CKEDITOR.dtd.$list );

				that.mergeList =
					// Both lists must exist
					startList && endList &&
					// ...and be of the same type
					// startList.getName() == endList.getName() &&
					// ...and share the same parent (same level in the tree)
					startList.getParent().equals( endList.getParent() ) &&
					// ...and must be different.
					!startList.equals( endList );

				that.mergeListItems =
					startPath.block && endPath.block &&
					// Both containers must be list items
					startPath.block.is( CKEDITOR.dtd.$listItem ) && endPath.block.is( CKEDITOR.dtd.$listItem );

				// Create merge bookmark.
				if ( that.mergeList || that.mergeListItems ) {
					var rangeClone = range.clone();

					rangeClone.setStartBefore( that.bookmark.startNode );
					rangeClone.setEndAfter( that.bookmark.endNode );

					that.mergeListBookmark = rangeClone.createBookmark();
				}
			},

			merge: function( that, editable ) {
				if ( !that.mergeListBookmark )
					return;

				var startNode = that.mergeListBookmark.startNode,
					endNode = that.mergeListBookmark.endNode,

					startPath = getPath( startNode, editable ),
					endPath = getPath( endNode, editable );

				if ( that.mergeList ) {
					var firstList = startPath.contains( CKEDITOR.dtd.$list ),
						secondList = endPath.contains( CKEDITOR.dtd.$list );

					if ( !firstList.equals( secondList ) ) {
						secondList.moveChildren( firstList );
						secondList.remove();
					}
				}

				if ( that.mergeListItems ) {
					var firstListItem = startPath.contains( CKEDITOR.dtd.$listItem ),
						secondListItem = endPath.contains( CKEDITOR.dtd.$listItem );

					if ( !firstListItem.equals( secondListItem ) ) {
						mergeElements( secondListItem, startNode, endNode );
					}
				}

				// Remove bookmark nodes.
				startNode.remove();
				endNode.remove();
			}
		};

		var block = {
			// Detects whether blocks should be merged once contents are extracted.
			detectMerge: function( that, editable ) {
				// Don't merge blocks if lists or tables are already involved.
				if ( that.tableContentsRanges || that.mergeListBookmark )
					return;

				var rangeClone = new CKEDITOR.dom.range( editable );

				rangeClone.setStartBefore( that.bookmark.startNode );
				rangeClone.setEndAfter( that.bookmark.endNode );

				that.mergeBlockBookmark = rangeClone.createBookmark();
			},

			merge: function( that, editable ) {
				if ( !that.mergeBlockBookmark || that.purgeTableBookmark )
					return;

				var startNode = that.mergeBlockBookmark.startNode,
					endNode = that.mergeBlockBookmark.endNode,

					startPath = getPath( startNode, editable ),
					endPath = getPath( endNode, editable ),

					firstBlock = startPath.block,
					secondBlock = endPath.block;

				if ( firstBlock && secondBlock && !firstBlock.equals( secondBlock ) ) {
					mergeElements( secondBlock, startNode, endNode );
				}

				// Remove bookmark nodes.
				startNode.remove();
				endNode.remove();
			}
		};

		var table = ( function() {
			var tableEditable = { td: 1, th: 1, caption: 1 };

			// Returns an array of ranges which should be entirely extracted.
			//
			// <table><tr>[<td>xx</td><td>y}y</td></tr></table>
			// will find:
			// <table><tr><td>[xx]</td><td>[y}y</td></tr></table>
			function findTableContentsRanges( range ) {
				// Leaving the below for debugging purposes.
				//
				// console.log( 'findTableContentsRanges' );
				// console.log( bender.tools.range.getWithHtml( range.root, range ) );

				var contentsRanges = [],
					editableRange,
					walker = new CKEDITOR.dom.walker( range ),
					startCell = range.startPath().contains( tableEditable ),
					endCell = range.endPath().contains( tableEditable ),
					database = {};

				walker.guard = function( node, leaving ) {
					// Guard may be executed on some node boundaries multiple times,
					// what results in creating more than one range for each selected cell. (https://dev.ckeditor.com/ticket/12964)
					if ( node.type == CKEDITOR.NODE_ELEMENT ) {
						var key = 'visited_' + ( leaving ? 'out' : 'in' );
						if ( node.getCustomData( key ) ) {
							return;
						}

						CKEDITOR.dom.element.setMarker( database, node, key, 1 );
					}

					// Handle partial selection in a cell in which the range starts:
					// <td><p>x{xx</p></td>...
					// will store:
					// <td><p>x{xx</p>]</td>
					if ( leaving && startCell && node.equals( startCell ) ) {
						editableRange = range.clone();
						editableRange.setEndAt( startCell, CKEDITOR.POSITION_BEFORE_END );
						contentsRanges.push( editableRange );
						return;
					}

					// Handle partial selection in a cell in which the range ends.
					if ( !leaving && endCell && node.equals( endCell ) ) {
						editableRange = range.clone();
						editableRange.setStartAt( endCell, CKEDITOR.POSITION_AFTER_START );
						contentsRanges.push( editableRange );
						return;
					}

					// Handle all other cells visited by the walker.
					// We need to check whether the cell is disjoint with
					// the start and end cells to correctly handle case like:
					// <td>x{x</td><td><table>..<td>y}y</td>..</table></td>
					// without the check the second cell's content would be entirely removed.
					// We also handle all nested cells (#787).
					if ( ( !leaving && checkRemoveCellContents( node ) ) ||
						( leaving && checkNested( node ) ) ) {
						editableRange = range.clone();
						editableRange.selectNodeContents( node );
						contentsRanges.push( editableRange );
					}
				};

				walker.lastForward();

				// Clear all markers so next extraction will not be affected by this one.
				CKEDITOR.dom.element.clearAllMarkers( database );

				return contentsRanges;

				// #787
				function checkNested( node ) {
					// Check only table cells, not every node inside table.
					if ( !node.is( tableEditable ) ) {
						return;
					}

					var startTable = startCell && startCell.getAscendant( 'table', true ),
						endTable = endCell && endCell.getAscendant( 'table', true ),
						nodeTable = node.getAscendant( 'table', true );

					return ( startTable && startTable.contains( nodeTable ) ) ||
						( endTable && endTable.contains( nodeTable ) );
				}

				function checkRemoveCellContents( node ) {
					return (
						// Must be a cell.
						node.type == CKEDITOR.NODE_ELEMENT && node.is( tableEditable ) &&
						// Must be disjoint with the range's startCell if exists.
						( !startCell || checkDisjointNodes( node, startCell ) ) &&
						// Must be disjoint with the range's endCell if exists.
						( !endCell || checkDisjointNodes( node, endCell ) )
					);
				}
			}

			// Returns a normalized common ancestor of a range.
			// If the real common ancestor is located somewhere in between a table and a td/th/caption,
			// then the table will be returned.
			function getNormalizedAncestor( range ) {
				var common = range.getCommonAncestor();

				if ( common.is( CKEDITOR.dtd.$tableContent ) && !common.is( tableEditable ) ) {
					common = common.getAscendant( 'table', true );
				}

				return common;
			}

			// Check whether node1 and node2 are disjoint, so are:
			// * not identical,
			// * not contained in each other.
			function checkDisjointNodes( node1, node2 ) {
				var disallowedPositions = CKEDITOR.POSITION_CONTAINS + CKEDITOR.POSITION_IS_CONTAINED,
					pos = node1.getPosition( node2 );

				// Baaah... IDENTICAL is 0, so we can't simplify this ;/.
				return pos === CKEDITOR.POSITION_IDENTICAL ?
					false :
					( ( pos & disallowedPositions ) === 0 );
			}

			return {
				// Detects whether to purge entire list.
				detectPurge: function( that ) {
					var range = that.range,
						walkerRange = range.clone();

					walkerRange.enlarge( CKEDITOR.ENLARGE_ELEMENT );

					var walker = new CKEDITOR.dom.walker( walkerRange ),
						editablesCount = 0;

					// Count the number of table editables in the range. If there's more than one,
					// table MAY be removed completely (it's a cross-cell range). Otherwise, only
					// the contents of the cell are usually removed.
					walker.evaluator = function( node ) {
						if ( node.type == CKEDITOR.NODE_ELEMENT && node.is( tableEditable ) ) {
							++editablesCount;
						}
					};

					walker.checkForward();

					if ( editablesCount > 1 ) {
						var startTable = range.startPath().contains( 'table' ),
							endTable = range.endPath().contains( 'table' );

						if ( startTable && endTable && range.checkBoundaryOfElement( startTable, CKEDITOR.START ) && range.checkBoundaryOfElement( endTable, CKEDITOR.END ) ) {
							var rangeClone = that.range.clone();

							rangeClone.setStartBefore( startTable );
							rangeClone.setEndAfter( endTable );

							that.purgeTableBookmark = rangeClone.createBookmark();
						}
					}
				},

				// The magic.
				//
				// This method tries to discover whether the range starts or ends somewhere in a table
				// (it is not interested whether the range contains a table, because in such case
				// the extractContents() methods does the job correctly).
				// If the range meets these criteria, then the method tries to discover and store the following:
				//
				// * that.tableSurroundingRange - a part of the range which is located outside of any table which
				// will be touched (note: when range is located in a single cell it does not touch the table).
				// This range can be placed at:
				//		* at the beginning: <p>he{re</p><table>..]..</table>
				//		* in the middle: <table>..[..</table><p>here</p><table>..]..</table>
				//		* at the end: <table>..[..</table><p>he}re</p>
				// * that.tableContentsRanges - an array of ranges with contents of td/th/caption that should be removed.
				// This assures that calling extractContents() does not change the structure of the table(s).
				detectRanges: function( that, editable ) {
					var range = createRangeFromBookmark( editable, that.bookmark ),
						surroundingRange = range.clone(),
						leftRange,
						rightRange,

						// Find a common ancestor and normalize it (so the following paths contain tables).
						commonAncestor = getNormalizedAncestor( range ),

						// Create paths using the normalized ancestor, so tables beyond the context
						// of the input range are not found.
						startPath = new CKEDITOR.dom.elementPath( range.startContainer, commonAncestor ),
						endPath = new CKEDITOR.dom.elementPath( range.endContainer, commonAncestor ),

						startTable = startPath.contains( 'table' ),
						endTable = endPath.contains( 'table' ),

						tableContentsRanges;

					// Nothing to do here - the range doesn't touch any table or
					// it contains a table, but that table is fully selected so it will be simply fully removed
					// by the normal algorithm.
					if ( !startTable && !endTable ) {
						return;
					}

					// Handle two disjoint tables case:
					// <table>..[..</table><p>ab</p><table>..]..</table>
					// is handled as (respectively: findTableContents( left ), surroundingRange, findTableContents( right )):
					// <table>..[..</table>][<p>ab</p>][<table>..]..</table>
					// Check that tables are disjoint to exclude a case when start equals end or one is contained
					// in the other.
					if ( startTable && endTable && checkDisjointNodes( startTable, endTable ) ) {
						that.tableSurroundingRange = surroundingRange;
						surroundingRange.setStartAt( startTable, CKEDITOR.POSITION_AFTER_END );
						surroundingRange.setEndAt( endTable, CKEDITOR.POSITION_BEFORE_START );

						leftRange = range.clone();
						leftRange.setEndAt( startTable, CKEDITOR.POSITION_AFTER_END );

						rightRange = range.clone();
						rightRange.setStartAt( endTable, CKEDITOR.POSITION_BEFORE_START );

						tableContentsRanges = findTableContentsRanges( leftRange ).concat( findTableContentsRanges( rightRange ) );
					}
					// Divide the initial range into two parts:
					// * range which contains the part containing the table,
					// * surroundingRange which contains the part outside the table.
					//
					// The surroundingRange exists only if one of the range ends is
					// located outside the table.
					//
					// <p>a{b</p><table>..]..</table><p>cd</p>
					// becomes (respectively: surroundingRange, range):
					// <p>a{b</p>][<table>..]..</table><p>cd</p>
					else if ( !startTable ) {
						that.tableSurroundingRange = surroundingRange;
						surroundingRange.setEndAt( endTable, CKEDITOR.POSITION_BEFORE_START );

						range.setStartAt( endTable, CKEDITOR.POSITION_AFTER_START );
					}
					// <p>ab</p><table>..[..</table><p>c}d</p>
					// becomes (respectively range, surroundingRange):
					// <p>ab</p><table>..[..</table>][<p>c}d</p>
					else if ( !endTable ) {
						that.tableSurroundingRange = surroundingRange;
						surroundingRange.setStartAt( startTable, CKEDITOR.POSITION_AFTER_END );

						range.setEndAt( startTable, CKEDITOR.POSITION_AFTER_END );
					}

					// Use already calculated or calculate for the remaining range.
					that.tableContentsRanges = tableContentsRanges ? tableContentsRanges : findTableContentsRanges( range );

					// Leaving the below for debugging purposes.
					//
					// if ( that.tableSurroundingRange ) {
					// 	console.log( 'tableSurroundingRange' );
					// 	console.log( bender.tools.range.getWithHtml( that.tableSurroundingRange.root, that.tableSurroundingRange ) );
					// }
					//
					// console.log( 'tableContentsRanges' );
					// that.tableContentsRanges.forEach( function( range ) {
					// 	console.log( bender.tools.range.getWithHtml( range.root, range ) );
					// } );
				},

				deleteRanges: function( that ) {
					var range;

					// Delete table cell contents.
					while ( ( range = that.tableContentsRanges.pop() ) ) {
						range.extractContents();

						if ( isEmpty( range.startContainer ) )
							range.startContainer.appendBogus();
					}

					// Finally delete surroundings of the table.
					if ( that.tableSurroundingRange ) {
						that.tableSurroundingRange.extractContents();
					}
				},

				purge: function( that ) {
					if ( !that.purgeTableBookmark )
						return;

					var doc = that.doc,
						range = that.range,
						rangeClone = range.clone(),
						// How about different enter modes?
						block = doc.createElement( 'p' );

					block.insertBefore( that.purgeTableBookmark.startNode );

					rangeClone.moveToBookmark( that.purgeTableBookmark );
					rangeClone.deleteContents();

					that.range.moveToPosition( block, CKEDITOR.POSITION_AFTER_START );
				}
			};
		} )();

		return {
			list: list,
			block: block,
			table: table,

			// Detects whether use "mergeThen" argument in range.extractContents().
			detectExtractMerge: function( that ) {
				// Don't merge if playing with lists.
				return !(
					that.range.startPath().contains( CKEDITOR.dtd.$listItem ) &&
					that.range.endPath().contains( CKEDITOR.dtd.$listItem )
				);
			},

			fixUneditableRangePosition: function( range ) {
				if ( !range.startContainer.getDtd()[ '#' ] ) {
					range.moveToClosestEditablePosition( null, true );
				}
			},

			// Perform auto paragraphing if needed.
			autoParagraph: function( editor, range ) {
				var path = range.startPath(),
					fixBlock;

				if ( shouldAutoParagraph( editor, path.block, path.blockLimit ) && ( fixBlock = autoParagraphTag( editor ) ) ) {
					fixBlock = range.document.createElement( fixBlock );
					fixBlock.appendBogus();
					range.insertNode( fixBlock );
					range.moveToPosition( fixBlock, CKEDITOR.POSITION_AFTER_START );
				}
			}
		};
	} )();

} )();

/**
 * Whether the editor must output an empty value (`''`) if its content only consists
 * of an empty paragraph.
 *
 *		config.ignoreEmptyParagraph = false;
 *
 * @cfg {Boolean} [ignoreEmptyParagraph=true]
 * @member CKEDITOR.config
 */

/**
 * Event fired by the editor in order to get accessibility help label.
 * The event is responded to by a component which provides accessibility
 * help (i.e. the `a11yhelp` plugin) hence the editor is notified whether
 * accessibility help is available.
 *
 * Providing info:
 *
 *		editor.on( 'ariaEditorHelpLabel', function( evt ) {
 *				evt.data.label = editor.lang.common.editorHelp;
 *		} );
 *
 * Getting label:
 *
 *		var helpLabel = editor.fire( 'ariaEditorHelpLabel', {} ).label;
 *
 * @since 4.4.3
 * @event ariaEditorHelpLabel
 * @param {String} label The label to be used.
 * @member CKEDITOR.editor
 */

/**
 * Event fired when the user double-clicks in the editable area.
 * The event allows to open a dialog window for a clicked element in a convenient way:
 *
 *		editor.on( 'doubleclick', function( evt ) {
 *			var element = evt.data.element;
 *
 *			if ( element.is( 'table' ) )
 *				evt.data.dialog = 'tableProperties';
 *		} );
 *
 * **Note:** To handle double-click on a widget use {@link CKEDITOR.plugins.widget#doubleclick}.
 *
 * @event doubleclick
 * @param data
 * @param {CKEDITOR.dom.element} data.element The double-clicked element.
 * @param {String} data.dialog The dialog window to be opened. If set by the listener,
 * the specified dialog window will be opened.
 * @member CKEDITOR.editor
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

( function() {
	var isMSSelection = typeof window.getSelection != 'function',
		nextRev = 1,
		// https://dev.ckeditor.com/ticket/13816
		fillingCharSequence = CKEDITOR.tools.repeat( '\u200b', 7 ),
		fillingCharSequenceRegExp = new RegExp( fillingCharSequence + '( )?', 'g' ),
		isSelectingTable;

	function isWidget( element ) {
		return CKEDITOR.plugins.widget && CKEDITOR.plugins.widget.isDomWidget( element );
	}

	// #### table selection : START
	// @param {CKEDITOR.dom.range[]} ranges
	// @param {Boolean} allowPartially Whether a collapsed selection within table is recognized to be a valid selection.
	// This happens for WebKits on MacOS, when you right click inside the table.
	function isTableSelection( ranges, allowPartially ) {
		if ( ranges.length === 0 ) {
			return false;
		}

		// It's not table selection when selected node is a widget (#1027).
		if ( isWidget( ranges[ 0 ].getEnclosedNode() ) ) {
			return false;
		}

		var node,
			i;

		function isPartiallySelected( range ) {
			var startCell = range.startContainer.getAscendant( { td: 1, th: 1 }, true ),
				endCell = range.endContainer.getAscendant( { td: 1, th: 1 }, true ),
				trim = CKEDITOR.tools.trim,
				selected;

			// Check if the selection is inside one cell and we don't have any nested table contents selected.
			if ( !startCell || !startCell.equals( endCell ) || startCell.findOne( 'td, th, tr, tbody, table' ) ) {
				return false;
			}

			selected = range.cloneContents();

			// Empty selection is still partially selected.
			if ( !selected.getFirst() ) {
				return true;
			}

			return trim( selected.getFirst().getText() ) !== trim( startCell.getText() );
		}

		// Edge case: partially selected text node inside one table cell or cursor inside cell.
		if ( !allowPartially && ranges.length === 1 &&
			( ranges[ 0 ].collapsed || isPartiallySelected( ranges[ 0 ] ) ) ) {
			return false;
		}

		for ( i = 0; i < ranges.length; i++ ) {
			node = ranges[ i ]._getTableElement();

			if ( !node ) {
				return false;
			}
		}

		return true;
	}

	// After performing fake table selection, the real selection is limited
	// to the first selected cell. Therefore to check if the real selection
	// matches the fake selection, we check if the table cell from fake selection's
	// first range and real selection's range are the same.
	// Also if the selection is collapsed, we should check if it's placed inside the table
	// in which the fake selection is or inside nested table. Such selection occurs after right mouse click.
	function isRealTableSelection( selection, fakeSelection ) {
		var ranges = selection.getRanges(),
			fakeRanges = fakeSelection.getRanges(),
			table = ranges.length && ranges[ 0 ]._getTableElement() &&
				ranges[ 0 ]._getTableElement().getAscendant( 'table', true ),
			fakeTable = fakeRanges.length && fakeRanges[ 0 ]._getTableElement() &&
				fakeRanges[ 0 ]._getTableElement().getAscendant( 'table', true ),
			isTableRange = ranges.length === 1 && ranges[ 0 ]._getTableElement() &&
					ranges[ 0 ]._getTableElement().is( 'table' ),
			isFakeTableRange = fakeRanges.length === 1 && fakeRanges[ 0 ]._getTableElement() &&
					fakeRanges[ 0 ]._getTableElement().is( 'table' );

		function isValidTableSelection( table, fakeTable, ranges, fakeRanges ) {
			var isMenuOpen = ranges.length === 1 && ranges[ 0 ].collapsed,
				// In case of WebKit on MacOS, when checking real selection, we must allow selection to be partial.
				// Otherwise the check will fail for table selection with opened context menu.
				isInTable = isTableSelection( ranges, !!CKEDITOR.env.webkit ) && isTableSelection( fakeRanges );

			return isSameTable( table, fakeTable ) && ( isMenuOpen || isInTable );
		}

		function isSameTable( table, fakeTable ) {
			if ( !table || !fakeTable ) {
				return false;
			}

			return table.equals( fakeTable ) || fakeTable.contains( table );
		}

		// When widget is selected, then definitely it's not a table (#1027).
		if ( isWidget( fakeSelection.getSelectedElement() ) ) {
			return false;
		}

		if ( isValidTableSelection( table, fakeTable, ranges, fakeRanges ) ) {
			// Edge case: when editor contains only table and that table is selected using selectAll command,
			// then the selection is not properly refreshed and it must be done manually.
			if ( isTableRange && !isFakeTableRange ) {
				fakeSelection.selectRanges( ranges );
			}
			return true;
		}

		return false;
	}

	function getSelectedCells( ranges ) {
		var cells = [],
			node,
			i;

		function getCellsFromElement( element ) {
			var cells = element.find( 'td, th' ),
				cellsArray = [],
				i;

			for ( i = 0; i < cells.count(); i++ ) {
				cellsArray.push( cells.getItem( i ) );
			}

			return cellsArray;
		}

		for ( i = 0; i < ranges.length; i++ ) {
			node = ranges[ i ]._getTableElement();

			if ( node.is && node.is( { td: 1, th: 1 } ) ) {
				cells.push( node );
			} else {
				cells = cells.concat( getCellsFromElement( node ) );
			}
		}

		return cells;
	}

	// Cells in the same row are separated by tab and the rows are separated by new line, e.g.
	// Cell 1.1	Cell 1.2
	// Cell 2.1	Cell 2.2
	function getTextFromSelectedCells( ranges ) {
		var cells = getSelectedCells( ranges ),
			txt = '',
			currentRow = [],
			lastRow,
			i;

		for ( i = 0; i < cells.length; i++ ) {
			if ( lastRow && !lastRow.equals( cells[ i ].getAscendant( 'tr' ) ) ) {
				txt += currentRow.join( '\t' ) + '\n';
				lastRow = cells[ i ].getAscendant( 'tr' );
				currentRow = [];
			} else if ( i === 0 ) {
				lastRow = cells[ i ].getAscendant( 'tr' );
			}

			currentRow.push( cells[ i ].getText() );
		}

		txt += currentRow.join( '\t' );

		return txt;
	}

	function performFakeTableSelection( ranges ) {
		var editor = this.root.editor,
			realSelection = editor.getSelection( 1 ),
			cache;

		// Cleanup after previous selection - e.g. remove hidden sel container.
		this.reset();

		// Indicate that the table is being fake-selected to prevent infinite loop
		// inside `selectRanges`.
		isSelectingTable = true;

		// Cancel selectionchange for the real selection.
		realSelection.root.once( 'selectionchange', function( evt ) {
			evt.cancel();
		}, null, null, 0 );

		// Move real selection to the first selected range.
		realSelection.selectRanges( [ ranges[ 0 ] ] );

		cache = this._.cache;

		// Caches given ranges.
		cache.ranges = new CKEDITOR.dom.rangeList( ranges );
		cache.type = CKEDITOR.SELECTION_TEXT;
		cache.selectedElement = ranges[ 0 ]._getTableElement();

		// `selectedText` should contain text from all selected data ("plain text table")
		// to be compatible with Firefox's implementation.
		cache.selectedText = getTextFromSelectedCells( ranges );

		// Properties that will not be available when isFake.
		cache.nativeSel = null;

		this.isFake = 1;
		this.rev = nextRev++;

		// Save this selection, so it can be returned by editor.getSelection().
		editor._.fakeSelection = this;

		isSelectingTable = false;

		// Fire selectionchange, just like a normal selection.
		this.root.fire( 'selectionchange' );
	}
	// #### table selection : END

	// #### checkSelectionChange : START

	// The selection change check basically saves the element parent tree of
	// the current node and check it on successive requests. If there is any
	// change on the tree, then the selectionChange event gets fired.
	function checkSelectionChange() {
		// A possibly available fake-selection.
		var sel = this._.fakeSelection,
			realSel;

		if ( sel ) {
			realSel = this.getSelection( 1 );
			// If real (not locked/stored) selection was moved from hidden container
			// or is not a table one, then the fake-selection must be invalidated.
			if ( !realSel || ( !realSel.isHidden() && !isRealTableSelection( realSel, sel ) ) ) {
				// Remove the cache from fake-selection references in use elsewhere.
				sel.reset();

				// Have the code using the native selection.
				sel = 0;
			}
		}

		// If not fake-selection is available then get the native selection.
		if ( !sel ) {
			sel = realSel || this.getSelection( 1 );

			// Editor may have no selection at all.
			if ( !sel || sel.getType() == CKEDITOR.SELECTION_NONE )
				return;
		}

		this.fire( 'selectionCheck', sel );

		var currentPath = this.elementPath();
		if ( !currentPath.compare( this._.selectionPreviousPath ) ) {
			// Handle case when dialog inserts new element but parent block and path (so also focus context) does not change. (https://dev.ckeditor.com/ticket/13362)
			var sameBlockParent = this._.selectionPreviousPath && this._.selectionPreviousPath.blockLimit.equals( currentPath.blockLimit );
			// Cache the active element, which we'll eventually lose on Webkit and Gecko (#1113).
			if ( ( CKEDITOR.env.webkit || CKEDITOR.env.gecko ) && !sameBlockParent ) {
				this._.previousActive = this.document.getActive();
			}

			this._.selectionPreviousPath = currentPath;
			this.fire( 'selectionChange', { selection: sel, path: currentPath } );
		}
	}

	var checkSelectionChangeTimer, checkSelectionChangeTimeoutPending;

	function checkSelectionChangeTimeout() {
		// Firing the "OnSelectionChange" event on every key press started to
		// be too slow. This function guarantees that there will be at least
		// 200ms delay between selection checks.

		checkSelectionChangeTimeoutPending = true;

		if ( checkSelectionChangeTimer )
			return;

		checkSelectionChangeTimeoutExec.call( this );

		checkSelectionChangeTimer = CKEDITOR.tools.setTimeout( checkSelectionChangeTimeoutExec, 200, this );
	}

	function checkSelectionChangeTimeoutExec() {
		checkSelectionChangeTimer = null;

		if ( checkSelectionChangeTimeoutPending ) {
			// Call this with a timeout so the browser properly moves the
			// selection after the mouseup. It happened that the selection was
			// being moved after the mouseup when clicking inside selected text
			// with Firefox.
			CKEDITOR.tools.setTimeout( checkSelectionChange, 0, this );

			checkSelectionChangeTimeoutPending = false;
		}
	}

	// #### checkSelectionChange : END

	var isVisible = CKEDITOR.dom.walker.invisible( 1 );

	// May absorb the caret if:
	// * is a visible node,
	// * is a non-empty element (this rule will accept elements like <strong></strong> because they
	//	they were not accepted by the isVisible() check, not not <br> which cannot absorb the caret).
	//	See https://dev.ckeditor.com/ticket/12621.
	function mayAbsorbCaret( node ) {
		if ( isVisible( node ) )
			return true;

		if ( node.type == CKEDITOR.NODE_ELEMENT && !node.is( CKEDITOR.dtd.$empty ) )
			return true;

		return false;
	}

	function rangeRequiresFix( range ) {
		// Whether we must prevent from absorbing caret by this context node.
		// Also checks whether there's an editable position next to that node.
		function ctxRequiresFix( node, isAtEnd ) {
			// It's ok for us if a text node absorbs the caret, because
			// the caret container element isn't changed then.
			if ( !node || node.type == CKEDITOR.NODE_TEXT )
				return false;

			var testRng = range.clone();
			return testRng[ 'moveToElementEdit' + ( isAtEnd ? 'End' : 'Start' ) ]( node );
		}

		// Range root must be the editable element, it's to avoid creating filler char
		// on any temporary internal selection.
		if ( !( range.root instanceof CKEDITOR.editable ) )
			return false;

		var ct = range.startContainer;

		var previous = range.getPreviousNode( mayAbsorbCaret, null, ct ),
			next = range.getNextNode( mayAbsorbCaret, null, ct );

		// Any adjacent text container may absorb the caret, e.g.
		// <p><strong>text</strong>^foo</p>
		// <p>foo^<strong>text</strong></p>
		// <div>^<p>foo</p></div>
		if ( ctxRequiresFix( previous ) || ctxRequiresFix( next, 1 ) )
			return true;

		// Empty block/inline element is also affected. <span>^</span>, <p>^</p> (https://dev.ckeditor.com/ticket/7222)
		// If you found this line confusing check https://dev.ckeditor.com/ticket/12655.
		if ( !( previous || next ) && !( ct.type == CKEDITOR.NODE_ELEMENT && ct.isBlockBoundary() && ct.getBogus() ) )
			return true;

		return false;
	}

	function createFillingCharSequenceNode( editable ) {
		removeFillingCharSequenceNode( editable, false );

		var fillingChar = editable.getDocument().createText( fillingCharSequence );
		editable.setCustomData( 'cke-fillingChar', fillingChar );

		return fillingChar;
	}

	// Checks if a filling char has been used, eventually removing it (https://dev.ckeditor.com/ticket/1272).
	function checkFillingCharSequenceNodeReady( editable ) {
		var fillingChar = editable.getCustomData( 'cke-fillingChar' );

		if ( fillingChar ) {
			// Use this flag to avoid removing the filling char right after
			// creating it.
			if ( fillingChar.getCustomData( 'ready' ) ) {
				removeFillingCharSequenceNode( editable );
				editable.editor.fire( 'selectionCheck' );
			} else {
				fillingChar.setCustomData( 'ready', 1 );
			}
		}
	}

	function removeFillingCharSequenceNode( editable, keepSelection ) {
		var fillingChar = editable && editable.removeCustomData( 'cke-fillingChar' );

		if ( fillingChar ) {
			// Text selection position might get mangled by
			// subsequent dom modification, save it now for restoring. (https://dev.ckeditor.com/ticket/8617)
			if ( keepSelection !== false ) {
				var sel = editable.getDocument().getSelection().getNative(),
					// Be error proof.
					range = sel && sel.type != 'None' && sel.getRangeAt( 0 ),
					fillingCharSeqLength = fillingCharSequence.length;

				// If there's some text other than the sequence in the FC text node and the range
				// intersects with that node...
				if ( fillingChar.getLength() > fillingCharSeqLength && range && range.intersectsNode( fillingChar.$ ) ) {
					var bm = createNativeSelectionBookmark( sel );

					// Correct start offset anticipating the removal of FC.
					if ( sel.anchorNode == fillingChar.$ && sel.anchorOffset > fillingCharSeqLength ) {
						bm[ 0 ].offset -= fillingCharSeqLength;
					}

					// Correct end offset anticipating the removal of FC.
					if ( sel.focusNode == fillingChar.$ && sel.focusOffset > fillingCharSeqLength ) {
						bm[ 1 ].offset -= fillingCharSeqLength;
					}
				}
			}

			// We can't simply remove the filling node because the user
			// will actually enlarge it when typing, so we just remove the
			// invisible char from it.
			fillingChar.setText( removeFillingCharSequenceString( fillingChar.getText(), 1 ) );

			// Restore the bookmark preserving selection's direction.
			if ( bm ) {
				moveNativeSelectionToBookmark( editable.getDocument().$, bm );
			}
		}
	}

	// https://dev.ckeditor.com/ticket/13816
	function removeFillingCharSequenceString( str, nbspAware ) {
		if ( nbspAware ) {
			return str.replace( fillingCharSequenceRegExp, function( m, p ) {
				// https://dev.ckeditor.com/ticket/10291 if filling char is followed by a space replace it with NBSP.
				return p ? '\xa0' : '';
			} );
		} else {
			return str.replace( fillingCharSequence, '' );
		}
	}

	function createNativeSelectionBookmark( sel ) {
		return [
			{ node: sel.anchorNode, offset: sel.anchorOffset },
			{ node: sel.focusNode, offset: sel.focusOffset }
		];
	}

	function moveNativeSelectionToBookmark( document, bm ) {
		var sel = document.getSelection(),
			range = document.createRange();

		range.setStart( bm[ 0 ].node, bm[ 0 ].offset );
		range.collapse( true );
		sel.removeAllRanges();
		sel.addRange( range );
		sel.extend( bm[ 1 ].node, bm[ 1 ].offset );
	}

	// Creates cke_hidden_sel container and puts real selection there.
	function hideSelection( editor, ariaLabel ) {
		var content = ariaLabel && CKEDITOR.tools.htmlEncode( ariaLabel ) || '&nbsp;',
			style = CKEDITOR.env.ie && CKEDITOR.env.version < 14 ? 'display:none' : 'position:fixed;top:0;left:-1000px;width:0;height:0;overflow:hidden;',
			hiddenEl = CKEDITOR.dom.element.createFromHtml(
				'<div data-cke-hidden-sel="1" data-cke-temp="1" style="' + style + '">' + content + '</div>',
				editor.document );

		editor.fire( 'lockSnapshot' );

		editor.editable().append( hiddenEl );

			// Always use real selection to avoid overriding locked one (https://dev.ckeditor.com/ticket/11104#comment:13).
		var sel = editor.getSelection( 1 ),
			range = editor.createRange(),
			// Cancel selectionchange fired by selectRanges - prevent from firing selectionChange.
			listener = sel.root.on( 'selectionchange', function( evt ) {
				evt.cancel();
			}, null, null, 0 );

		range.setStartAt( hiddenEl, CKEDITOR.POSITION_AFTER_START );
		range.setEndAt( hiddenEl, CKEDITOR.POSITION_BEFORE_END );
		sel.selectRanges( [ range ] );

		listener.removeListener();

		editor.fire( 'unlockSnapshot' );

		// Set this value at the end, so reset() executed by selectRanges()
		// will clean up old hidden selection container.
		editor._.hiddenSelectionContainer = hiddenEl;
	}

	function removeHiddenSelectionContainer( editor ) {
		var hiddenEl = editor._.hiddenSelectionContainer;

		if ( hiddenEl ) {
			var isDirty = editor.checkDirty();

			editor.fire( 'lockSnapshot' );
			hiddenEl.remove();
			editor.fire( 'unlockSnapshot' );

			!isDirty && editor.resetDirty();
		}

		delete editor._.hiddenSelectionContainer;
	}

	// Object containing keystroke handlers for fake selection.
	var fakeSelectionDefaultKeystrokeHandlers = ( function() {
		function leave( right ) {
			return function( evt ) {
				var range = evt.editor.createRange();

				// Move selection only if there's a editable place for it.
				// It no, then do nothing (keystroke will be blocked, widget selection kept).
				if ( range.moveToClosestEditablePosition( evt.selected, right ) )
					evt.editor.getSelection().selectRanges( [ range ] );

				// Prevent default.
				return false;
			};
		}

		function del( right ) {
			return function( evt ) {
				var editor = evt.editor,
					range = editor.createRange(),
					found;

				// We have to skip deletion for read only editor (#1516).
				if ( editor.readOnly ) {
					return;
				}

				// If haven't found place for caret on the default side,
				// try to find it on the other side.
				if ( !( found = range.moveToClosestEditablePosition( evt.selected, right ) ) )
					found = range.moveToClosestEditablePosition( evt.selected, !right );

				if ( found )
					editor.getSelection().selectRanges( [ range ] );

				// Save the state before removing selected element.
				editor.fire( 'saveSnapshot' );

				evt.selected.remove();

				// Haven't found any editable space before removing element,
				// try to place the caret anywhere (most likely, in empty editable).
				if ( !found ) {
					range.moveToElementEditablePosition( editor.editable() );
					editor.getSelection().selectRanges( [ range ] );
				}

				editor.fire( 'saveSnapshot' );

				// Prevent default.
				return false;
			};
		}

		var leaveLeft = leave(),
			leaveRight = leave( 1 );

		return {
			37: leaveLeft,		// LEFT
			38: leaveLeft,		// UP
			39: leaveRight,		// RIGHT
			40: leaveRight,		// DOWN
			8: del(),			// BACKSPACE
			46: del( 1 )		// DELETE
		};
	} )();

	// Handle left, right, delete and backspace keystrokes next to non-editable elements
	// by faking selection on them.
	function getOnKeyDownListener( editor ) {
		var keystrokes = { 37: 1, 39: 1, 8: 1, 46: 1 };

		return function( evt ) {
			var keystroke = evt.data.getKeystroke();

			// Handle only left/right/del/bspace keys.
			if ( !keystrokes[ keystroke ] )
				return;

			var sel = editor.getSelection(),
				ranges = sel.getRanges(),
				range = ranges[ 0 ];

			// Handle only single range and it has to be collapsed.
			if ( ranges.length != 1 || !range.collapsed )
				return;

			var next = range[ keystroke < 38 ? 'getPreviousEditableNode' : 'getNextEditableNode' ]();

			if ( next && next.type == CKEDITOR.NODE_ELEMENT && next.getAttribute( 'contenteditable' ) == 'false' ) {
				editor.getSelection().fake( next );
				evt.data.preventDefault();
				evt.cancel();
			}
		};
	}

	// If fake selection should be applied this function will return instance of
	// CKEDITOR.dom.element which should gain fake selection.
	function getNonEditableFakeSelectionReceiver( ranges ) {
		var enclosedNode, shrinkedNode, clone, range;

		if ( ranges.length == 1 && !( range = ranges[ 0 ] ).collapsed &&
			( enclosedNode = range.getEnclosedNode() ) && enclosedNode.type == CKEDITOR.NODE_ELEMENT ) {
			// So far we can't say that enclosed element is non-editable. Before checking,
			// we'll shrink range (clone). Shrinking will stop on non-editable range, or
			// innermost element (https://dev.ckeditor.com/ticket/11114).
			clone = range.clone();
			clone.shrink( CKEDITOR.SHRINK_ELEMENT, true );

			// If shrinked range still encloses an element, check this one (shrink stops only on non-editable elements).
			if ( ( shrinkedNode = clone.getEnclosedNode() ) && shrinkedNode.type == CKEDITOR.NODE_ELEMENT )
				enclosedNode = shrinkedNode;

			if ( enclosedNode.getAttribute( 'contenteditable' ) == 'false' )
				return enclosedNode;
		}
	}

	// Fix ranges which may end after hidden selection container.
	// Note: this function may only be used if hidden selection container
	// is not in DOM any more.
	function fixRangesAfterHiddenSelectionContainer( ranges, root ) {
		var range;
		for ( var i = 0; i < ranges.length; ++i ) {
			range = ranges[ i ];
			if ( range.endContainer.equals( root ) ) {
				// We can use getChildCount() because hidden selection container is not in DOM.
				range.endOffset = Math.min( range.endOffset, root.getChildCount() );
			}
		}
	}

	// Extract only editable part or ranges.
	// Note: this function modifies ranges list!
	// @param {CKEDITOR.dom.rangeList} ranges
	function extractEditableRanges( ranges ) {
		for ( var i = 0; i < ranges.length; i++ ) {
			var range = ranges[ i ];

			// Drop range spans inside one ready-only node.
			var parent = range.getCommonAncestor();
			if ( parent.isReadOnly() )
				ranges.splice( i, 1 );

			if ( range.collapsed )
				continue;

			// Range may start inside a non-editable element,
			// replace the range start after it.
			if ( range.startContainer.isReadOnly() ) {
				var current = range.startContainer,
					isElement;

				while ( current ) {
					isElement = current.type == CKEDITOR.NODE_ELEMENT;

					if ( ( isElement && current.is( 'body' ) ) || !current.isReadOnly() )
						break;

					if ( isElement && current.getAttribute( 'contentEditable' ) == 'false' )
						range.setStartAfter( current );

					current = current.getParent();
				}
			}

			var startContainer = range.startContainer,
				endContainer = range.endContainer,
				startOffset = range.startOffset,
				endOffset = range.endOffset,
				walkerRange = range.clone();

			// Enlarge range start/end with text node to avoid walker
			// being DOM destructive, it doesn't interfere our checking
			// of elements below as well.
			if ( startContainer && startContainer.type == CKEDITOR.NODE_TEXT ) {
				if ( startOffset >= startContainer.getLength() )
					walkerRange.setStartAfter( startContainer );
				else
					walkerRange.setStartBefore( startContainer );
			}

			if ( endContainer && endContainer.type == CKEDITOR.NODE_TEXT ) {
				if ( !endOffset )
					walkerRange.setEndBefore( endContainer );
				else
					walkerRange.setEndAfter( endContainer );
			}

			// Looking for non-editable element inside the range.
			var walker = new CKEDITOR.dom.walker( walkerRange );
			walker.evaluator = function( node ) {
				if ( node.type == CKEDITOR.NODE_ELEMENT && node.isReadOnly() ) {
					var newRange = range.clone();
					range.setEndBefore( node );

					// Drop collapsed range around read-only elements,
					// it make sure the range list empty when selecting
					// only non-editable elements.
					if ( range.collapsed )
						ranges.splice( i--, 1 );

					// Avoid creating invalid range.
					if ( !( node.getPosition( walkerRange.endContainer ) & CKEDITOR.POSITION_CONTAINS ) ) {
						newRange.setStartAfter( node );
						if ( !newRange.collapsed )
							ranges.splice( i + 1, 0, newRange );
					}

					return true;
				}

				return false;
			};

			walker.next();
		}

		return ranges;
	}

	// Setup all editor instances for the necessary selection hooks.
	CKEDITOR.on( 'instanceCreated', function( ev ) {
		var editor = ev.editor;

		editor.on( 'contentDom', function() {
			var doc = editor.document,
				outerDoc = CKEDITOR.document,
				editable = editor.editable(),
				body = doc.getBody(),
				html = doc.getDocumentElement();

			var isInline = editable.isInline();

			var restoreSel,
				lastSel;

			// Give the editable an initial selection on first focus,
			// put selection at a consistent position at the start
			// of the contents. (https://dev.ckeditor.com/ticket/9507)
			if ( CKEDITOR.env.gecko ) {
				editable.attachListener( editable, 'focus', function( evt ) {
					evt.removeListener();

					if ( restoreSel !== 0 ) {
						var nativ = editor.getSelection().getNative();
						// Do it only if the native selection is at an unwanted
						// place (at the very start of the editable). https://dev.ckeditor.com/ticket/10119
						if ( nativ && nativ.isCollapsed && nativ.anchorNode == editable.$ ) {
							var rng = editor.createRange();
							rng.moveToElementEditStart( editable );
							rng.select();
						}
					}
				}, null, null, -2 );
			}

			// Plays the magic here to restore/save dom selection on editable focus/blur.
			editable.attachListener( editable, CKEDITOR.env.webkit || CKEDITOR.env.gecko ? 'focusin' : 'focus' , function() {
				// On Webkit&Gecko (#1113) we use focusin which is fired more often than focus - e.g. when moving from main editable
				// to nested editable (or the opposite). Unlock selection all, but restore only when it was locked
				// for the same active element, what will e.g. mean restoring after displaying dialog.
				if ( restoreSel && ( CKEDITOR.env.webkit || CKEDITOR.env.gecko ) ) {
					restoreSel = editor._.previousActive && editor._.previousActive.equals( doc.getActive() );

					// On Webkit when editor uses divarea, native focus causes editable viewport to scroll
					// to the top (when there is no active selection inside while focusing) so the scroll
					// position should be restored after focusing back editable area. (https://dev.ckeditor.com/ticket/14659)
					var requiresScrollFix = editor._.previousScrollTop != null && editor._.previousScrollTop != editable.$.scrollTop;
					if ( CKEDITOR.env.webkit && restoreSel && requiresScrollFix ) {
						editable.$.scrollTop = editor._.previousScrollTop;
					}
				}

				editor.unlockSelection( restoreSel );
				restoreSel = 0;
			}, null, null, -1 );

			// Disable selection restoring when clicking in.
			editable.attachListener( editable, 'mousedown', function() {
				restoreSel = 0;
			} );

			// Save a cloned version of current selection.
			function saveSel() {
				lastSel = new CKEDITOR.dom.selection( editor.getSelection() );
				lastSel.lock();
			}

			// Browsers could loose the selection once the editable lost focus,
			// in such case we need to reproduce it by saving a locked selection
			// and restoring it upon focus gain.
			if ( CKEDITOR.env.ie || isInline ) {
				// For old IEs, we can retrieve the last correct DOM selection upon the "beforedeactivate" event.
				// For the rest, a more frequent check is required for each selection change made.
				if ( isMSSelection )
					editable.attachListener( editable, 'beforedeactivate', saveSel, null, null, -1 );
				else
					editable.attachListener( editor, 'selectionCheck', saveSel, null, null, -1 );

				// Lock the selection and mark it to be restored.
				// On Webkit&Gecko (#1113) we use focusout which is fired more often than blur. I.e. it will also be
				// fired when nested editable is blurred.
				editable.attachListener( editable, CKEDITOR.env.webkit || CKEDITOR.env.gecko ? 'focusout' : 'blur', function() {
					editor.lockSelection( lastSel );
					restoreSel = 1;
				}, null, null, -1 );

				// Disable selection restoring when clicking in.
				editable.attachListener( editable, 'mousedown', function() {
					restoreSel = 0;
				} );
			}

			// The following selection-related fixes only apply to classic (`iframe`-based) editable.
			if ( CKEDITOR.env.ie && !isInline ) {
				var scroll;
				editable.attachListener( editable, 'mousedown', function( evt ) {
					// IE scrolls document to top on right mousedown
					// when editor has no focus, remember this scroll
					// position and revert it before context menu opens. (https://dev.ckeditor.com/ticket/5778)
					if ( evt.data.$.button == 2 ) {
						var sel = editor.document.getSelection();
						if ( !sel || sel.getType() == CKEDITOR.SELECTION_NONE )
							scroll = editor.window.getScrollPosition();
					}
				} );

				editable.attachListener( editable, 'mouseup', function( evt ) {
					// Restore recorded scroll position when needed on right mouseup.
					if ( evt.data.$.button == 2 && scroll ) {
						editor.document.$.documentElement.scrollLeft = scroll.x;
						editor.document.$.documentElement.scrollTop = scroll.y;
					}
					scroll = null;
				} );

				// When content doc is in standards mode, IE doesn't focus the editor when
				// clicking at the region below body (on html element) content, we emulate
				// the normal behavior on old IEs. (https://dev.ckeditor.com/ticket/1659, https://dev.ckeditor.com/ticket/7932)
				if ( doc.$.compatMode != 'BackCompat' ) {
					if ( CKEDITOR.env.ie7Compat || CKEDITOR.env.ie6Compat ) {
						var textRng,
							startRng;

						html.on( 'mousedown', function( evt ) {
							evt = evt.data;

							// Expand the text range along with mouse move.
							function onHover( evt ) {
								evt = evt.data.$;
								if ( textRng ) {
									// Read the current cursor.
									var rngEnd = body.$.createTextRange();

									moveRangeToPoint( rngEnd, evt.clientX, evt.clientY );

									// Handle drag directions.
									textRng.setEndPoint(
										startRng.compareEndPoints( 'StartToStart', rngEnd ) < 0 ?
										'EndToEnd' : 'StartToStart', rngEnd );

									// Update selection with new range.
									textRng.select();
								}
							}

							function removeListeners() {
								outerDoc.removeListener( 'mouseup', onSelectEnd );
								html.removeListener( 'mouseup', onSelectEnd );
							}

							function onSelectEnd() {
								html.removeListener( 'mousemove', onHover );
								removeListeners();

								// Make it in effect on mouse up. (https://dev.ckeditor.com/ticket/9022)
								textRng.select();
							}


							// We're sure that the click happens at the region
							// below body, but not on scrollbar.
							if ( evt.getTarget().is( 'html' ) &&
									evt.$.y < html.$.clientHeight &&
									evt.$.x < html.$.clientWidth ) {
								// Start to build the text range.
								textRng = body.$.createTextRange();
								moveRangeToPoint( textRng, evt.$.clientX, evt.$.clientY );

								// Records the dragging start of the above text range.
								startRng = textRng.duplicate();

								html.on( 'mousemove', onHover );
								outerDoc.on( 'mouseup', onSelectEnd );
								html.on( 'mouseup', onSelectEnd );
							}
						} );
					}

					// It's much simpler for IE8+, we just need to reselect the reported range.
					// This hack does not work on IE>=11 because there's no old selection&range APIs.
					if ( CKEDITOR.env.version > 7 && CKEDITOR.env.version < 11 ) {
						html.on( 'mousedown', function( evt ) {
							if ( evt.data.getTarget().is( 'html' ) ) {
								// Limit the text selection mouse move inside of editable. (https://dev.ckeditor.com/ticket/9715)
								outerDoc.on( 'mouseup', onSelectEnd );
								html.on( 'mouseup', onSelectEnd );
							}
						} );
					}
				}
			}

			// We check the selection change:
			// 1. Upon "selectionchange" event from the editable element. (which might be faked event fired by our code)
			// 2. After the accomplish of keyboard, mouse and touch (#2276) events.
			editable.attachListener( editable, 'selectionchange', checkSelectionChange, editor );
			editable.attachListener( editable, 'keyup', checkSelectionChangeTimeout, editor );
			editable.attachListener( editable, 'touchstart', checkSelectionChangeTimeout, editor );
			editable.attachListener( editable, 'touchend', checkSelectionChangeTimeout, editor );

			if ( CKEDITOR.env.ie ) {
				// https://dev.ckeditor.com/ticket/14407 - Don't even let anything happen if the selection is in a non-editable element.
				editable.attachListener( editable, 'keydown', function( evt ) {
					var sel = this.getSelection( 1 ),
						ascendant = getNonEditableAscendant( sel );

					// Prevent changing selection when an ascendant is an entire editable (#1632).
					if ( ascendant && !ascendant.equals( editable ) ) {
						sel.selectElement( ascendant );
						evt.data.preventDefault();
					}
				}, editor );
			}

			// Always fire the selection change on focus gain.
			// On Webkit&Gecko (#1113) do this on focusin, because the selection is unlocked on it too and
			// we need synchronization between those listeners to not lost cached editor._.previousActive property
			// (which is updated on selectionCheck).
			editable.attachListener( editable, CKEDITOR.env.webkit || CKEDITOR.env.gecko ? 'focusin' : 'focus', function() {
				editor.forceNextSelectionCheck();
				editor.selectionChange( 1 );
			} );

			// https://dev.ckeditor.com/ticket/9699: On Webkit&Gecko in inline editor we have to check selection when it was changed
			// by dragging and releasing mouse button outside editable. Dragging (mousedown)
			// has to be initialized in editable, but for mouseup we listen on document element.
			if ( isInline && ( CKEDITOR.env.webkit || CKEDITOR.env.gecko ) ) {
				var mouseDown;
				editable.attachListener( editable, 'mousedown', function() {
					mouseDown = 1;
				} );
				editable.attachListener( doc.getDocumentElement(), 'mouseup', function() {
					if ( mouseDown )
						checkSelectionChangeTimeout.call( editor );
					mouseDown = 0;
				} );
			}
			// In all other cases listen on simple mouseup over editable, as we did before https://dev.ckeditor.com/ticket/9699.
			//
			// Use document instead of editable in non-IEs for observing mouseup
			// since editable won't fire the event if selection process started within iframe and ended out
			// of the editor (https://dev.ckeditor.com/ticket/9851).
			else {
				editable.attachListener( CKEDITOR.env.ie ? editable : doc.getDocumentElement(), 'mouseup', checkSelectionChangeTimeout, editor );
			}

			if ( CKEDITOR.env.webkit ) {
				// Before keystroke is handled by editor, check to remove the filling char.
				editable.attachListener( doc, 'keydown', function( evt ) {
					var key = evt.data.getKey();
					// Remove the filling char before some keys get
					// executed, so they'll not get blocked by it.
					switch ( key ) {
						case 13: // ENTER
						case 33: // PAGEUP
						case 34: // PAGEDOWN
						case 35: // HOME
						case 36: // END
						case 37: // LEFT-ARROW
						case 39: // RIGHT-ARROW
						case 8: // BACKSPACE
						case 45: // INS
						case 46: // DEl
							if ( editable.hasFocus ) {
								removeFillingCharSequenceNode( editable );
							}
					}

				}, null, null, -1 );
			}

			editable.attachListener( editable, 'keydown', getOnKeyDownListener( editor ), null, null, -1 );

			function moveRangeToPoint( range, x, y ) {
				// Error prune in IE7. (https://dev.ckeditor.com/ticket/9034, https://dev.ckeditor.com/ticket/9110)
				try {
					range.moveToPoint( x, y );
				} catch ( e ) {}
			}

			function removeListeners() {
				outerDoc.removeListener( 'mouseup', onSelectEnd );
				html.removeListener( 'mouseup', onSelectEnd );
			}

			function onSelectEnd() {
				removeListeners();

				// The event is not fired when clicking on the scrollbars,
				// so we can safely check the following to understand
				// whether the empty space following <body> has been clicked.
				var sel = CKEDITOR.document.$.selection,
					range = sel.createRange();

				// The selection range is reported on host, but actually it should applies to the content doc.
				// The parentElement may be null for read only mode in IE10 and below (https://dev.ckeditor.com/ticket/9780).
				if ( sel.type != 'None' && range.parentElement() && range.parentElement().ownerDocument == doc.$ )
					range.select();
			}

			function getNonEditableAscendant( sel ) {
				var range = sel.getRanges()[ 0 ];

				if ( !range ) {
					return null;
				}

				// Fetch first contenteditable parent.
				var ascendant = range.startContainer.getAscendant( function( parent ) {
					return parent.type == CKEDITOR.NODE_ELEMENT && parent.hasAttribute( 'contenteditable' );
				}, true );

				if ( ascendant && ascendant.getAttribute( 'contenteditable' ) === 'false' ) {
					return ascendant;
				}

				return null;
			}
		} );

		editor.on( 'setData', function() {
			// Invalidate locked selection when unloading DOM.
			// (https://dev.ckeditor.com/ticket/9521, https://dev.ckeditor.com/ticket/5217#comment:32 and https://dev.ckeditor.com/ticket/11500#comment:11)
			editor.unlockSelection();

			// Webkit's selection will mess up after the data loading.
			if ( CKEDITOR.env.webkit )
				clearSelection();
		} );

		// Catch all the cases which above setData listener couldn't catch.
		// For example: switching to source mode and destroying editor.
		editor.on( 'contentDomUnload', function() {
			editor.unlockSelection();
		} );

		// IE9 might cease to work if there's an object selection inside the iframe (https://dev.ckeditor.com/ticket/7639).
		if ( CKEDITOR.env.ie9Compat )
			editor.on( 'beforeDestroy', clearSelection, null, null, 9 );

		// Check selection change on data reload.
		editor.on( 'dataReady', function() {
			// Clean up fake selection after setting data.
			delete editor._.fakeSelection;
			delete editor._.hiddenSelectionContainer;

			editor.selectionChange( 1 );
		} );

		// When loaded data are ready check whether hidden selection container was not loaded.
		editor.on( 'loadSnapshot', function() {
			var isElement = CKEDITOR.dom.walker.nodeType( CKEDITOR.NODE_ELEMENT ),
				// TODO replace with el.find() which will be introduced in https://dev.ckeditor.com/ticket/9764,
				// because it may happen that hidden sel container won't be the last element.
				last = editor.editable().getLast( isElement );

			if ( last && last.hasAttribute( 'data-cke-hidden-sel' ) ) {
				last.remove();

				// Firefox does a very unfortunate thing. When a non-editable element is the only
				// element in the editable, when we remove the hidden selection container, Firefox
				// will insert a bogus <br> at the beginning of the editable...
				// See: https://bugzilla.mozilla.org/show_bug.cgi?id=911201
				//
				// This behavior is never desired because this <br> pushes the content lower, but in
				// this case it is especially dangerous, because it happens when a bookmark is being restored.
				// Since this <br> is inserted at the beginning it changes indexes and thus breaks the bookmark2
				// what results in errors.
				//
				// So... let's revert what Firefox broke.
				if ( CKEDITOR.env.gecko ) {
					var first = editor.editable().getFirst( isElement );
					if ( first && first.is( 'br' ) && first.getAttribute( '_moz_editor_bogus_node' ) ) {
						first.remove();
					}
				}
			}
		}, null, null, 100 );

		editor.on( 'key', function( evt ) {
			if ( editor.mode != 'wysiwyg' ) {
				return;
			}

			var sel = editor.getSelection();
			if ( !sel.isFake )
				return;

			var handler = fakeSelectionDefaultKeystrokeHandlers[ evt.data.keyCode ];
			if ( handler )
				return handler( { editor: editor, selected: sel.getSelectedElement(), selection: sel, keyEvent: evt } );
		} );

		function clearSelection() {
			var sel = editor.getSelection();
			sel && sel.removeAllRanges();
		}
	} );

	// On WebKit only, we need a special "filling" char on some situations
	// (https://dev.ckeditor.com/ticket/1272). Here we set the events that should invalidate that char.
	if ( CKEDITOR.env.webkit ) {
		CKEDITOR.on( 'instanceReady', function( evt ) {
			var editor = evt.editor;

			editor.on( 'selectionChange', function() {
				checkFillingCharSequenceNodeReady( editor.editable() );
			}, null, null, -1 );

			editor.on( 'beforeSetMode', function() {
				removeFillingCharSequenceNode( editor.editable() );
			}, null, null, -1 );

			// Filter Undo snapshot's HTML to get rid of Filling Char Sequence.
			// Note: CKEDITOR.dom.range.createBookmark2() normalizes snapshot's
			// bookmarks to anticipate the removal of FCSeq from the snapshot's HTML (https://dev.ckeditor.com/ticket/13816).
			editor.on( 'getSnapshot', function( evt ) {
				if ( evt.data ) {
					evt.data = removeFillingCharSequenceString( evt.data );
				}
			}, editor, null, 20 );

			// Filter data to get rid of Filling Char Sequence. Filter on #toDataFormat
			// instead of #getData because once removed, FCSeq may leave an empty element,
			// which should be pruned by the dataProcessor (https://dev.ckeditor.com/ticket/13816).
			// Note: Used low priority to filter when dataProcessor works on strings,
			// not pseudo–DOM.
			editor.on( 'toDataFormat', function( evt ) {
				evt.data.dataValue = removeFillingCharSequenceString( evt.data.dataValue );
			}, null, null, 0 );
		} );
	}

	/**
	 * Check the selection change in editor and potentially fires
	 * the {@link CKEDITOR.editor#event-selectionChange} event.
	 *
	 * @method
	 * @member CKEDITOR.editor
	 * @param {Boolean} [checkNow=false] Force the check to happen immediately
	 * instead of coming with a timeout delay (default).
	 */
	CKEDITOR.editor.prototype.selectionChange = function( checkNow ) {
		( checkNow ? checkSelectionChange : checkSelectionChangeTimeout ).call( this );
	};

	/**
	 * Retrieve the editor selection in scope of editable element.
	 *
	 * **Note:** Since the native browser selection provides only one single
	 * selection at a time per document, so if editor's editable element has lost focus,
	 * this method will return a null value unless the {@link CKEDITOR.editor#lockSelection}
	 * has been called beforehand so the saved selection is retrieved.
	 *
	 *		var selection = CKEDITOR.instances.editor1.getSelection();
	 *		alert( selection.getType() );
	 *
	 * @method
	 * @member CKEDITOR.editor
	 * @param {Boolean} forceRealSelection Return real selection, instead of saved or fake one.
	 * @returns {CKEDITOR.dom.selection} A selection object or null if not available for the moment.
	 */
	CKEDITOR.editor.prototype.getSelection = function( forceRealSelection ) {

		// Check if there exists a locked or fake selection.
		if ( ( this._.savedSelection || this._.fakeSelection ) && !forceRealSelection )
			return this._.savedSelection || this._.fakeSelection;

		// Editable element might be absent or editor might not be in a wysiwyg mode.
		var editable = this.editable();
		return editable && this.mode == 'wysiwyg' ? new CKEDITOR.dom.selection( editable ) : null;
	};

	/**
	 * Locks the selection made in the editor in order to make it possible to
	 * manipulate it without browser interference. A locked selection is
	 * cached and remains unchanged until it is released with the
	 * {@link CKEDITOR.editor#unlockSelection} method.
	 *
	 * @method
	 * @member CKEDITOR.editor
	 * @param {CKEDITOR.dom.selection} [sel] Specify the selection to be locked.
	 * @returns {Boolean} `true` if selection was locked.
	 */
	CKEDITOR.editor.prototype.lockSelection = function( sel ) {
		sel = sel || this.getSelection( 1 );
		if ( sel.getType() != CKEDITOR.SELECTION_NONE ) {
			!sel.isLocked && sel.lock();
			this._.savedSelection = sel;
			return true;
		}
		return false;
	};

	/**
	 * Unlocks the selection made in the editor and locked with the
	 * {@link CKEDITOR.editor#lockSelection} method. An unlocked selection
	 * is no longer cached and can be changed.
	 *
	 * @method
	 * @member CKEDITOR.editor
	 * @param {Boolean} [restore] If set to `true`, the selection is
	 * restored back to the selection saved earlier by using the
	 * {@link CKEDITOR.dom.selection#lock} method.
	 */
	CKEDITOR.editor.prototype.unlockSelection = function( restore ) {
		var sel = this._.savedSelection;
		if ( sel ) {
			sel.unlock( restore );
			delete this._.savedSelection;
			return true;
		}

		return false;
	};

	/**
	 * @method
	 * @member CKEDITOR.editor
	 * @todo
	 */
	CKEDITOR.editor.prototype.forceNextSelectionCheck = function() {
		delete this._.selectionPreviousPath;
	};

	/**
	 * Gets the current selection in context of the document's body element.
	 *
	 *		var selection = CKEDITOR.instances.editor1.document.getSelection();
	 *		alert( selection.getType() );
	 *
	 * @method
	 * @member CKEDITOR.dom.document
	 * @returns {CKEDITOR.dom.selection} A selection object.
	 */
	CKEDITOR.dom.document.prototype.getSelection = function() {
		return new CKEDITOR.dom.selection( this );
	};

	/**
	 * Select this range as the only one with {@link CKEDITOR.dom.selection#selectRanges}.
	 *
	 * @method
	 * @returns {CKEDITOR.dom.selection}
	 * @member CKEDITOR.dom.range
	 */
	CKEDITOR.dom.range.prototype.select = function() {
		var sel = this.root instanceof CKEDITOR.editable ? this.root.editor.getSelection() : new CKEDITOR.dom.selection( this.root );

		sel.selectRanges( [ this ] );

		return sel;
	};

	/**
	 * No selection.
	 *
	 *		if ( editor.getSelection().getType() == CKEDITOR.SELECTION_NONE )
	 *			alert( 'Nothing is selected' );
	 *
	 * @readonly
	 * @property {Number} [=1]
	 * @member CKEDITOR
	 */
	CKEDITOR.SELECTION_NONE = 1;

	/**
	 * A text or a collapsed selection.
	 *
	 *		if ( editor.getSelection().getType() == CKEDITOR.SELECTION_TEXT )
	 *			alert( 'A text is selected' );
	 *
	 * @readonly
	 * @property {Number} [=2]
	 * @member CKEDITOR
	 */
	CKEDITOR.SELECTION_TEXT = 2;

	/**
	 * Element selection.
	 *
	 *		if ( editor.getSelection().getType() == CKEDITOR.SELECTION_ELEMENT )
	 *			alert( 'An element is selected' );
	 *
	 * @readonly
	 * @property {Number} [=3]
	 * @member CKEDITOR
	 */
	CKEDITOR.SELECTION_ELEMENT = 3;

	/**
	 * Manipulates the selection within a DOM element. If the current browser selection
	 * spans outside of the element, an empty selection object is returned.
	 *
	 * Despite the fact that selection's constructor allows to create selection instances,
	 * usually it's better to get selection from the editor instance:
	 *
	 *		var sel = editor.getSelection();
	 *
	 * See {@link CKEDITOR.editor#getSelection}.
	 *
	 * @class
	 * @constructor Creates a selection class instance.
	 *
	 *		// Selection scoped in document.
	 *		var sel = new CKEDITOR.dom.selection( CKEDITOR.document );
	 *
	 *		// Selection scoped in element with 'editable' id.
	 *		var sel = new CKEDITOR.dom.selection( CKEDITOR.document.getById( 'editable' ) );
	 *
	 *		// Cloning selection.
	 *		var clone = new CKEDITOR.dom.selection( sel );
	 *
	 * @param {CKEDITOR.dom.document/CKEDITOR.dom.element/CKEDITOR.dom.selection} target
	 * The DOM document/element that the DOM selection is restrained to. Only selection which spans
	 * within the target element is considered as valid.
	 *
	 * If {@link CKEDITOR.dom.selection} is passed, then its clone will be created.
	 */
	CKEDITOR.dom.selection = function( target ) {
		// Target is a selection - clone it.
		if ( target instanceof CKEDITOR.dom.selection ) {
			var selection = target;
			target = target.root;
		}

		var isElement = target instanceof CKEDITOR.dom.element,
			root;

		this.rev = selection ? selection.rev : nextRev++;
		this.document = target instanceof CKEDITOR.dom.document ? target : target.getDocument();
		this.root = root = isElement ? target : this.document.getBody();
		this.isLocked = 0;
		this._ = {
			cache: {}
		};

		// Clone selection.
		if ( selection ) {
			CKEDITOR.tools.extend( this._.cache, selection._.cache );
			this.isFake = selection.isFake;
			this.isLocked = selection.isLocked;
			return this;
		}

		// Check whether browser focus is really inside of the editable element.

		var nativeSel = this.getNative(),
			rangeParent,
			range;

		if ( nativeSel ) {
			if ( nativeSel.getRangeAt ) {
				range = nativeSel.rangeCount && nativeSel.getRangeAt( 0 );
				rangeParent = range && new CKEDITOR.dom.node( range.commonAncestorContainer );
			}
			// For old IEs.
			else {
				// Sometimes, mostly when selection is close to the table or hr,
				// IE throws "Unspecified error".
				try {
					range = nativeSel.createRange();
				} catch ( err ) {}
				rangeParent = range && CKEDITOR.dom.element.get( range.item && range.item( 0 ) || range.parentElement() );
			}
		}

		// Selection out of concerned range, empty the selection.
		// TODO check whether this condition cannot be reverted to its old
		// form (commented out) after we closed https://dev.ckeditor.com/ticket/10438.
		//if ( !( rangeParent && ( root.equals( rangeParent ) || root.contains( rangeParent ) ) ) ) {
		if ( !(
			rangeParent &&
			( rangeParent.type == CKEDITOR.NODE_ELEMENT || rangeParent.type == CKEDITOR.NODE_TEXT ) &&
			( this.root.equals( rangeParent ) || this.root.contains( rangeParent ) )
		) ) {

			this._.cache.type = CKEDITOR.SELECTION_NONE;
			this._.cache.startElement = null;
			this._.cache.selectedElement = null;
			this._.cache.selectedText = '';
			this._.cache.ranges = new CKEDITOR.dom.rangeList();
		}

		return this;
	};

	var styleObjectElements = { img: 1, hr: 1, li: 1, table: 1, tr: 1, td: 1, th: 1, embed: 1, object: 1, ol: 1, ul: 1,
			a: 1, input: 1, form: 1, select: 1, textarea: 1, button: 1, fieldset: 1, thead: 1, tfoot: 1 };

	CKEDITOR.tools.extend( CKEDITOR.dom.selection, {
		_removeFillingCharSequenceString: removeFillingCharSequenceString,
		_createFillingCharSequenceNode: createFillingCharSequenceNode,

		/**
		 * The sequence used in a WebKit-based browser to create a Filling Character. By default it is
		 * a string of 7 zero-width space characters (U+200B).
		 *
		 * @since 4.5.7
		 * @readonly
		 * @property {String}
		 */
		FILLING_CHAR_SEQUENCE: fillingCharSequence
	} );

	CKEDITOR.dom.selection.prototype = {
		/**
		 * Gets the native selection object from the browser.
		 *
		 *		var selection = editor.getSelection().getNative();
		 *
		 * @returns {Object} The native browser selection object or null if this is a fake selection.
		 */
		getNative: function() {
			if ( this._.cache.nativeSel !== undefined )
				return this._.cache.nativeSel;

			return ( this._.cache.nativeSel = isMSSelection ? this.document.$.selection : this.document.getWindow().$.getSelection() );
		},

		/**
		 * Gets the type of the current selection. The following values are
		 * available:
		 *
		 * * {@link CKEDITOR#SELECTION_NONE} (1): No selection.
		 * * {@link CKEDITOR#SELECTION_TEXT} (2): A text or a collapsed selection is selected.
		 * * {@link CKEDITOR#SELECTION_ELEMENT} (3): An element is selected.
		 *
		 * Example:
		 *
		 *		if ( editor.getSelection().getType() == CKEDITOR.SELECTION_TEXT )
		 *			alert( 'A text is selected' );
		 *
		 * @method
		 * @returns {Number} One of the following constant values: {@link CKEDITOR#SELECTION_NONE},
		 * {@link CKEDITOR#SELECTION_TEXT} or {@link CKEDITOR#SELECTION_ELEMENT}.
		 */
		getType: isMSSelection ?
		function() {
			var cache = this._.cache;
			if ( cache.type )
				return cache.type;

			var type = CKEDITOR.SELECTION_NONE;

			try {
				var sel = this.getNative(),
					ieType = sel.type;

				if ( ieType == 'Text' )
					type = CKEDITOR.SELECTION_TEXT;

				if ( ieType == 'Control' )
					type = CKEDITOR.SELECTION_ELEMENT;

				// It is possible that we can still get a text range
				// object even when type == 'None' is returned by IE.
				// So we'd better check the object returned by
				// createRange() rather than by looking at the type.
				if ( sel.createRange().parentElement() )
					type = CKEDITOR.SELECTION_TEXT;
			} catch ( e ) {}

			return ( cache.type = type );
		} : function() {
			var cache = this._.cache;
			if ( cache.type )
				return cache.type;

			var type = CKEDITOR.SELECTION_TEXT;

			var sel = this.getNative();

			if ( !( sel && sel.rangeCount ) )
				type = CKEDITOR.SELECTION_NONE;
			else if ( sel.rangeCount == 1 ) {
				// Check if the actual selection is a control (IMG,
				// TABLE, HR, etc...).

				var range = sel.getRangeAt( 0 ),
					startContainer = range.startContainer;

				if ( startContainer == range.endContainer && startContainer.nodeType == 1 &&
					( range.endOffset - range.startOffset ) == 1 &&
					styleObjectElements[ startContainer.childNodes[ range.startOffset ].nodeName.toLowerCase() ] ) {
					type = CKEDITOR.SELECTION_ELEMENT;
				}

			}

			return ( cache.type = type );
		},

		/**
		 * Retrieves the {@link CKEDITOR.dom.range} instances that represent the current selection.
		 *
		 * Note: Some browsers return multiple ranges even for a continuous selection. Firefox, for example, returns
		 * one range for each table cell when one or more table rows are selected.
		 *
		 *		var ranges = selection.getRanges();
		 *		alert( ranges.length );
		 *
		 * @method
		 * @param {Boolean} [onlyEditables] If set to `true`, this function retrieves editable ranges only.
		 * @returns {Array} Range instances that represent the current selection.
		 */
		getRanges: ( function() {
			var func = isMSSelection ? ( function() {
				function getNodeIndex( node ) {
					return new CKEDITOR.dom.node( node ).getIndex();
				}

				// Finds the container and offset for a specific boundary
				// of an IE range.
				var getBoundaryInformation = function( range, start ) {
					// Creates a collapsed range at the requested boundary.
					range = range.duplicate();
					range.collapse( start );

					// Gets the element that encloses the range entirely.
					var parent = range.parentElement();

					// Empty parent element, e.g. <i>^</i>
					if ( !parent.hasChildNodes() )
						return { container: parent, offset: 0 };

					var siblings = parent.children,
						child, sibling,
						testRange = range.duplicate(),
						startIndex = 0,
						endIndex = siblings.length - 1,
						index = -1,
						position, distance, container;

					// Binary search over all element children to test the range to see whether
					// range is right on the boundary of one element.
					while ( startIndex <= endIndex ) {
						index = Math.floor( ( startIndex + endIndex ) / 2 );
						child = siblings[ index ];
						testRange.moveToElementText( child );
						position = testRange.compareEndPoints( 'StartToStart', range );

						if ( position > 0 )
							endIndex = index - 1;
						else if ( position < 0 )
							startIndex = index + 1;
						else
							return { container: parent, offset: getNodeIndex( child ) };
					}

					// All children are text nodes,
					// or to the right hand of test range are all text nodes. (https://dev.ckeditor.com/ticket/6992)
					if ( index == -1 || index == siblings.length - 1 && position < 0 ) {
						// Adapt test range to embrace the entire parent contents.
						testRange.moveToElementText( parent );
						testRange.setEndPoint( 'StartToStart', range );

						// IE report line break as CRLF with range.text but
						// only LF with textnode.nodeValue, normalize them to avoid
						// breaking character counting logic below. (https://dev.ckeditor.com/ticket/3949)
						distance = testRange.text.replace( /(\r\n|\r)/g, '\n' ).length;

						siblings = parent.childNodes;

						// Actual range anchor right beside test range at the boundary of text node.
						if ( !distance ) {
							child = siblings[ siblings.length - 1 ];

							if ( child.nodeType != CKEDITOR.NODE_TEXT )
								return { container: parent, offset: siblings.length };
							else
								return { container: child, offset: child.nodeValue.length };
						}

						// Start the measuring until distance overflows, meanwhile count the text nodes.
						var i = siblings.length;
						while ( distance > 0 && i > 0 ) {
							sibling = siblings[ --i ];
							if ( sibling.nodeType == CKEDITOR.NODE_TEXT ) {
								container = sibling;
								distance -= sibling.nodeValue.length;
							}
						}

						return { container: container, offset: -distance };
					}
					// Test range was one offset beyond OR behind the anchored text node.
					else {
						// Adapt one side of test range to the actual range
						// for measuring the offset between them.
						testRange.collapse( position > 0 ? true : false );
						testRange.setEndPoint( position > 0 ? 'StartToStart' : 'EndToStart', range );

						// IE report line break as CRLF with range.text but
						// only LF with textnode.nodeValue, normalize them to avoid
						// breaking character counting logic below. (https://dev.ckeditor.com/ticket/3949)
						distance = testRange.text.replace( /(\r\n|\r)/g, '\n' ).length;

						// Actual range anchor right beside test range at the inner boundary of text node.
						if ( !distance )
							return { container: parent, offset: getNodeIndex( child ) + ( position > 0 ? 0 : 1 ) };

						// Start the measuring until distance overflows, meanwhile count the text nodes.
						while ( distance > 0 ) {
							try {
								sibling = child[ position > 0 ? 'previousSibling' : 'nextSibling' ];
								if ( sibling.nodeType == CKEDITOR.NODE_TEXT ) {
									distance -= sibling.nodeValue.length;
									container = sibling;
								}
								child = sibling;
							}
							// Measurement in IE could be sometimes wrong because of <select> element. (https://dev.ckeditor.com/ticket/4611)
							catch ( e ) {
								return { container: parent, offset: getNodeIndex( child ) };
							}
						}

						return { container: container, offset: position > 0 ? -distance : container.nodeValue.length + distance };
					}
				};

				return function() {
					// IE doesn't have range support (in the W3C way), so we
					// need to do some magic to transform selections into
					// CKEDITOR.dom.range instances.

					var sel = this.getNative(),
						nativeRange = sel && sel.createRange(),
						type = this.getType(),
						range;

					if ( !sel )
						return [];

					if ( type == CKEDITOR.SELECTION_TEXT ) {
						range = new CKEDITOR.dom.range( this.root );

						var boundaryInfo = getBoundaryInformation( nativeRange, true );
						range.setStart( new CKEDITOR.dom.node( boundaryInfo.container ), boundaryInfo.offset );

						boundaryInfo = getBoundaryInformation( nativeRange );
						range.setEnd( new CKEDITOR.dom.node( boundaryInfo.container ), boundaryInfo.offset );

						// Correct an invalid IE range case on empty list item. (https://dev.ckeditor.com/ticket/5850)
						if ( range.endContainer.getPosition( range.startContainer ) & CKEDITOR.POSITION_PRECEDING && range.endOffset <= range.startContainer.getIndex() )
							range.collapse();

						return [ range ];
					} else if ( type == CKEDITOR.SELECTION_ELEMENT ) {
						var retval = [];

						for ( var i = 0; i < nativeRange.length; i++ ) {
							var element = nativeRange.item( i ),
								parentElement = element.parentNode,
								j = 0;

							range = new CKEDITOR.dom.range( this.root );

							for ( ; j < parentElement.childNodes.length && parentElement.childNodes[ j ] != element; j++ ) {

							}

							range.setStart( new CKEDITOR.dom.node( parentElement ), j );
							range.setEnd( new CKEDITOR.dom.node( parentElement ), j + 1 );
							retval.push( range );
						}

						return retval;
					}

					return [];
				};
			} )() :
			function() {
				// On browsers implementing the W3C range, we simply
				// transform the native ranges in CKEDITOR.dom.range
				// instances.

				var ranges = [],
					range,
					sel = this.getNative();

				if ( !sel )
					return ranges;

				for ( var i = 0; i < sel.rangeCount; i++ ) {
					var nativeRange = sel.getRangeAt( i );

					range = new CKEDITOR.dom.range( this.root );

					range.setStart( new CKEDITOR.dom.node( nativeRange.startContainer ), nativeRange.startOffset );
					range.setEnd( new CKEDITOR.dom.node( nativeRange.endContainer ), nativeRange.endOffset );
					ranges.push( range );
				}
				return ranges;
			};

			return function( onlyEditables ) {
				var cache = this._.cache,
					ranges = cache.ranges;

				if ( !ranges )
					cache.ranges = ranges = new CKEDITOR.dom.rangeList( func.call( this ) );

				if ( !onlyEditables )
					return ranges;

				// Split range into multiple by read-only nodes.
				// Clone ranges array to avoid changing cached ranges (https://dev.ckeditor.com/ticket/11493).
				return extractEditableRanges( new CKEDITOR.dom.rangeList( ranges.slice() ) );
			};
		} )(),

		/**
		 * Gets the DOM element in which the selection starts.
		 *
		 *		var element = editor.getSelection().getStartElement();
		 *		alert( element.getName() );
		 *
		 * @returns {CKEDITOR.dom.element} The element at the beginning of the selection.
		 */
		getStartElement: function() {
			var cache = this._.cache;
			if ( cache.startElement !== undefined )
				return cache.startElement;

			var node;

			switch ( this.getType() ) {
				case CKEDITOR.SELECTION_ELEMENT:
					return this.getSelectedElement();

				case CKEDITOR.SELECTION_TEXT:

					var range = this.getRanges()[ 0 ];

					if ( range ) {
						if ( !range.collapsed ) {
							range.optimize();

							// Decrease the range content to exclude particial
							// selected node on the start which doesn't have
							// visual impact. ( https://dev.ckeditor.com/ticket/3231 )
							while ( 1 ) {
								var startContainer = range.startContainer,
									startOffset = range.startOffset;
								// Limit the fix only to non-block elements.(https://dev.ckeditor.com/ticket/3950)
								if ( startOffset == ( startContainer.getChildCount ? startContainer.getChildCount() : startContainer.getLength() ) && !startContainer.isBlockBoundary() )
									range.setStartAfter( startContainer );
								else
									break;
							}

							node = range.startContainer;

							if ( node.type != CKEDITOR.NODE_ELEMENT )
								return node.getParent();

							node = node.getChild( range.startOffset );

							if ( !node || node.type != CKEDITOR.NODE_ELEMENT )
								node = range.startContainer;
							else {
								var child = node.getFirst();
								while ( child && child.type == CKEDITOR.NODE_ELEMENT ) {
									node = child;
									child = child.getFirst();
								}
							}
						} else {
							node = range.startContainer;
							if ( node.type != CKEDITOR.NODE_ELEMENT )
								node = node.getParent();
						}

						node = node.$;
					}
			}

			return cache.startElement = ( node ? new CKEDITOR.dom.element( node ) : null );
		},

		/**
		 * Gets the currently selected element.
		 *
		 *		var element = editor.getSelection().getSelectedElement();
		 *		alert( element.getName() );
		 *
		 * @returns {CKEDITOR.dom.element/null} The selected element. `null` if no
		 * selection is available or the selection type is not {@link CKEDITOR#SELECTION_ELEMENT}.
		 */
		getSelectedElement: function() {
			var cache = this._.cache;
			if ( cache.selectedElement !== undefined )
				return cache.selectedElement;

			var self = this;

			var node = CKEDITOR.tools.tryThese(
				// Is it native IE control type selection?
				function() {
					return self.getNative().createRange().item( 0 );
				},
				// Figure it out by checking if there's a single enclosed
				// node of the range.
				function() {
					var range = self.getRanges()[ 0 ].clone(),
						enclosed, selected;

					// Check first any enclosed element, e.g. <ul>[<li><a href="#">item</a></li>]</ul>
					for ( var i = 2; i && !( ( enclosed = range.getEnclosedNode() ) && ( enclosed.type == CKEDITOR.NODE_ELEMENT ) && styleObjectElements[ enclosed.getName() ] && ( selected = enclosed ) ); i-- ) {
						// Then check any deep wrapped element, e.g. [<b><i><img /></i></b>]
						range.shrink( CKEDITOR.SHRINK_ELEMENT );
					}

					return selected && selected.$;
				}
			);

			return cache.selectedElement = ( node ? new CKEDITOR.dom.element( node ) : null );
		},

		/**
		 * Retrieves the text contained within the range. An empty string is returned for non-text selection.
		 *
		 *		var text = editor.getSelection().getSelectedText();
		 *		alert( text );
		 *
		 * @since 3.6.1
		 * @returns {String} A string of text within the current selection.
		 */
		getSelectedText: function() {
			var cache = this._.cache;
			if ( cache.selectedText !== undefined )
				return cache.selectedText;

			var nativeSel = this.getNative(),
				text = isMSSelection ? nativeSel.type == 'Control' ? '' : nativeSel.createRange().text : nativeSel.toString();

			return ( cache.selectedText = text );
		},

		/**
		 * Locks the selection made in the editor in order to make it possible to
		 * manipulate it without browser interference. A locked selection is
		 * cached and remains unchanged until it is released with the {@link #unlock} method.
		 *
		 *		editor.getSelection().lock();
		 */
		lock: function() {
			// Call all cacheable function.
			this.getRanges();
			this.getStartElement();
			this.getSelectedElement();
			this.getSelectedText();

			// The native selection is not available when locked.
			this._.cache.nativeSel = null;

			this.isLocked = 1;
		},

		/**
		 * @todo
		 */
		unlock: function( restore ) {
			if ( !this.isLocked )
				return;

			if ( restore ) {
				var selectedElement = this.getSelectedElement(),
					ranges = this.getRanges(),
					faked = this.isFake;
			}

			this.isLocked = 0;
			this.reset();

			if ( restore ) {
				// Saved selection may be outdated (e.g. anchored in offline nodes).
				// Avoid getting broken by such.
				var common = selectedElement || ranges[ 0 ] && ranges[ 0 ].getCommonAncestor();
				if ( !( common && common.getAscendant( 'body', 1 ) ) )
					return;

				if ( isTableSelection( ranges ) ) {
					// Tables have it's own selection method.
					performFakeTableSelection.call( this, ranges );
				} else if ( faked )
					this.fake( selectedElement );
				else if ( selectedElement )
					this.selectElement( selectedElement );
				else
					this.selectRanges( ranges );
			}
		},

		/**
		 * Clears the selection cache.
		 *
		 *		editor.getSelection().reset();
		 */
		reset: function() {
			this._.cache = {};
			this.isFake = 0;

			var editor = this.root.editor;

			// Invalidate any fake selection available in the editor.
			if ( editor && editor._.fakeSelection ) {
				// Test whether this selection is the one that was
				// faked or its clone.
				if ( this.rev == editor._.fakeSelection.rev ) {
					delete editor._.fakeSelection;
					removeHiddenSelectionContainer( editor );
				}
				else {
					CKEDITOR.warn( 'selection-fake-reset' );
				}
			}

			this.rev = nextRev++;
		},

		/**
		 * Makes the current selection of type {@link CKEDITOR#SELECTION_ELEMENT} by enclosing the specified element.
		 *
		 *		var element = editor.document.getById( 'sampleElement' );
		 *		editor.getSelection().selectElement( element );
		 *
		 * @param {CKEDITOR.dom.element} element The element to enclose in the selection.
		 */
		selectElement: function( element ) {
			var range = new CKEDITOR.dom.range( this.root );
			range.setStartBefore( element );
			range.setEndAfter( element );
			this.selectRanges( [ range ] );
		},

		/**
		 * Clears the original selection and adds the specified ranges to the document selection.
		 *
		 * 		// Move selection to the end of the editable element.
		 *		var range = editor.createRange();
		 *		range.moveToPosition( range.root, CKEDITOR.POSITION_BEFORE_END );
		 *		editor.getSelection().selectRanges( [ ranges ] );
		 *
		 * @param {Array} ranges An array of {@link CKEDITOR.dom.range} instances
		 * representing ranges to be added to the document.
		 */
		selectRanges: function( ranges ) {
			var editor = this.root.editor,
				hadHiddenSelectionContainer = editor && editor._.hiddenSelectionContainer;

			this.reset();

			// Check if there's a hiddenSelectionContainer in editable at some index.
			// Some ranges may be anchored after the hiddenSelectionContainer and,
			// once the container is removed while resetting the selection, they
			// may need new endOffset (one element less within the range) (https://dev.ckeditor.com/ticket/11021 https://dev.ckeditor.com/ticket/11393).
			if ( hadHiddenSelectionContainer )
				fixRangesAfterHiddenSelectionContainer( ranges, this.root );

			if ( !ranges.length )
				return;

			// Refresh the locked selection.
			if ( this.isLocked ) {
				// making a new DOM selection will force the focus on editable in certain situation,
				// we have to save the currently focused element for later recovery.
				var focused = CKEDITOR.document.getActive();
				this.unlock();
				this.selectRanges( ranges );
				this.lock();
				// Return to the previously focused element.
				focused && !focused.equals( this.root ) && focused.focus();
				return;
			}

			// Handle special case - automatic fake selection on non-editable elements.
			var receiver = getNonEditableFakeSelectionReceiver( ranges );

			if ( receiver ) {
				this.fake( receiver );
				return;
			}

			// Handle special case - fake selection of table cells.
			if ( editor && editor.plugins.tableselection &&
				editor.plugins.tableselection.isSupportedEnvironment() &&
				isTableSelection( ranges ) && !isSelectingTable &&
				!ranges[ 0 ]._getTableElement( { table: 1 } ).hasAttribute( 'data-cke-tableselection-ignored' )
			) {
				performFakeTableSelection.call( this, ranges );
				return;
			}

			if ( isMSSelection ) {
				var notWhitespaces = CKEDITOR.dom.walker.whitespaces( true ),
					fillerTextRegex = /\ufeff|\u00a0/,
					nonCells = { table: 1, tbody: 1, tr: 1 };

				if ( ranges.length > 1 ) {
					// IE doesn't accept multiple ranges selection, so we join all into one.
					var last = ranges[ ranges.length - 1 ];
					ranges[ 0 ].setEnd( last.endContainer, last.endOffset );
				}

				var range = ranges[ 0 ];
				var collapsed = range.collapsed,
					isStartMarkerAlone, dummySpan, ieRange;

				// Try to make a object selection, be careful with selecting phase element in IE
				// will breaks the selection in non-framed environment.
				var selected = range.getEnclosedNode();
				if ( selected && selected.type == CKEDITOR.NODE_ELEMENT && selected.getName() in styleObjectElements &&
					!( selected.is( 'a' ) && selected.getText() ) ) {
					try {
						ieRange = selected.$.createControlRange();
						ieRange.addElement( selected.$ );
						ieRange.select();
						return;
					} catch ( er ) {}
				}

				// IE doesn't support selecting the entire table row/cell, move the selection into cells, e.g.
				// <table><tbody><tr>[<td>cell</b></td>... => <table><tbody><tr><td>[cell</td>...
				if ( range.startContainer.type == CKEDITOR.NODE_ELEMENT && range.startContainer.getName() in nonCells ||
					range.endContainer.type == CKEDITOR.NODE_ELEMENT && range.endContainer.getName() in nonCells ) {
					range.shrink( CKEDITOR.NODE_ELEMENT, true );
					// The range might get collapsed (https://dev.ckeditor.com/ticket/7975). Update cached variable.
					collapsed = range.collapsed;
				}

				var bookmark = range.createBookmark();

				// Create marker tags for the start and end boundaries.
				var startNode = bookmark.startNode;

				var endNode;
				if ( !collapsed )
					endNode = bookmark.endNode;

				// Create the main range which will be used for the selection.
				ieRange = range.document.$.body.createTextRange();

				// Position the range at the start boundary.
				ieRange.moveToElementText( startNode.$ );
				ieRange.moveStart( 'character', 1 );

				if ( endNode ) {
					// Create a tool range for the end.
					var ieRangeEnd = range.document.$.body.createTextRange();

					// Position the tool range at the end.
					ieRangeEnd.moveToElementText( endNode.$ );

					// Move the end boundary of the main range to match the tool range.
					ieRange.setEndPoint( 'EndToEnd', ieRangeEnd );
					ieRange.moveEnd( 'character', -1 );
				} else {
					// The isStartMarkerAlone logic comes from V2. It guarantees that the lines
					// will expand and that the cursor will be blinking on the right place.
					// Actually, we are using this flag just to avoid using this hack in all
					// situations, but just on those needed.
					var next = startNode.getNext( notWhitespaces );
					var inPre = startNode.hasAscendant( 'pre' );
					isStartMarkerAlone = ( !( next && next.getText && next.getText().match( fillerTextRegex ) ) && // already a filler there?
						( inPre || !startNode.hasPrevious() || ( startNode.getPrevious().is && startNode.getPrevious().is( 'br' ) ) ) );

					// Append a temporary <span>&#65279;</span> before the selection.
					// This is needed to avoid IE destroying selections inside empty
					// inline elements, like <b></b> (https://dev.ckeditor.com/ticket/253).
					// It is also needed when placing the selection right after an inline
					// element to avoid the selection moving inside of it.
					dummySpan = range.document.createElement( 'span' );
					dummySpan.setHtml( '&#65279;' ); // Zero Width No-Break Space (U+FEFF). See https://dev.ckeditor.com/ticket/1359.
					dummySpan.insertBefore( startNode );

					if ( isStartMarkerAlone ) {
						// To expand empty blocks or line spaces after <br>, we need
						// instead to have any char, which will be later deleted using the
						// selection.
						// \ufeff = Zero Width No-Break Space (U+FEFF). (https://dev.ckeditor.com/ticket/1359)
						range.document.createText( '\ufeff' ).insertBefore( startNode );
					}
				}

				// Remove the markers (reset the position, because of the changes in the DOM tree).
				range.setStartBefore( startNode );
				startNode.remove();

				if ( collapsed ) {
					if ( isStartMarkerAlone ) {
						// Move the selection start to include the temporary \ufeff.
						ieRange.moveStart( 'character', -1 );

						ieRange.select();

						// Remove our temporary stuff.
						range.document.$.selection.clear();
					} else {
						ieRange.select();
					}

					range.moveToPosition( dummySpan, CKEDITOR.POSITION_BEFORE_START );
					dummySpan.remove();
				} else {
					range.setEndBefore( endNode );
					endNode.remove();
					ieRange.select();
				}
			} else {
				var sel = this.getNative();

				// getNative() returns null if iframe is "display:none" in FF. (https://dev.ckeditor.com/ticket/6577)
				if ( !sel )
					return;

				this.removeAllRanges();

				for ( var i = 0; i < ranges.length; i++ ) {
					// Joining sequential ranges introduced by
					// readonly elements protection.
					if ( i < ranges.length - 1 ) {
						var left = ranges[ i ],
							right = ranges[ i + 1 ],
							between = left.clone();
						between.setStart( left.endContainer, left.endOffset );
						between.setEnd( right.startContainer, right.startOffset );

						// Don't confused by Firefox adjacent multi-ranges
						// introduced by table cells selection.
						if ( !between.collapsed ) {
							between.shrink( CKEDITOR.NODE_ELEMENT, true );
							var ancestor = between.getCommonAncestor(),
								enclosed = between.getEnclosedNode();

							// The following cases has to be considered:
							// 1. <span contenteditable="false">[placeholder]</span>
							// 2. <input contenteditable="false"  type="radio"/> (https://dev.ckeditor.com/ticket/6621)
							if ( ancestor.isReadOnly() || enclosed && enclosed.isReadOnly() ) {
								right.setStart( left.startContainer, left.startOffset );
								ranges.splice( i--, 1 );
								continue;
							}
						}
					}

					range = ranges[ i ];

					var nativeRange = this.document.$.createRange();

					if ( range.collapsed && CKEDITOR.env.webkit && rangeRequiresFix( range ) ) {
						// Append a zero-width space so WebKit will not try to
						// move the selection by itself (https://dev.ckeditor.com/ticket/1272).
						var fillingChar = createFillingCharSequenceNode( this.root );
						range.insertNode( fillingChar );

						next = fillingChar.getNext();

						// If the filling char is followed by a <br>, whithout
						// having something before it, it'll not blink.
						// Let's remove it in this case.
						if ( next && !fillingChar.getPrevious() && next.type == CKEDITOR.NODE_ELEMENT && next.getName() == 'br' ) {
							removeFillingCharSequenceNode( this.root );
							range.moveToPosition( next, CKEDITOR.POSITION_BEFORE_START );
						} else {
							range.moveToPosition( fillingChar, CKEDITOR.POSITION_AFTER_END );
						}
					}

					nativeRange.setStart( range.startContainer.$, range.startOffset );

					try {
						nativeRange.setEnd( range.endContainer.$, range.endOffset );
					} catch ( e ) {
						// There is a bug in Firefox implementation (it would be too easy
						// otherwise). The new start can't be after the end (W3C says it can).
						// So, let's create a new range and collapse it to the desired point.
						if ( e.toString().indexOf( 'NS_ERROR_ILLEGAL_VALUE' ) >= 0 ) {
							range.collapse( 1 );
							nativeRange.setEnd( range.endContainer.$, range.endOffset );
						} else {
							throw e;
						}
					}

					// Select the range.
					sel.addRange( nativeRange );
				}
			}

			this.reset();

			// Fakes the IE DOM event "selectionchange" on editable.
			this.root.fire( 'selectionchange' );
		},

		/**
		 * Makes a "fake selection" of an element.
		 *
		 * A fake selection does not render UI artifacts over the selected
		 * element. Additionally, the browser native selection system is not
		 * aware of the fake selection. In practice, the native selection is
		 * moved to a hidden place where no native selection UI artifacts are
		 * displayed to the user.
		 *
		 * @param {CKEDITOR.dom.element} element The element to be "selected".
		 * @param {String} [ariaLabel] A string to be used by the screen reader to describe the selection.
		 */
		fake: function( element, ariaLabel ) {
			var editor = this.root.editor;

			// Attempt to retrieve aria-label if possible (https://dev.ckeditor.com/ticket/14539).
			if ( ariaLabel === undefined && element.hasAttribute( 'aria-label' ) ) {
				ariaLabel = element.getAttribute( 'aria-label' );
			}

			// Cleanup after previous selection - e.g. remove hidden sel container.
			this.reset();

			hideSelection( editor, ariaLabel );

			// Set this value after executing hiseSelection, because it may
			// cause reset() which overwrites cache.
			var cache = this._.cache;

			// Caches a range than holds the element.
			var range = new CKEDITOR.dom.range( this.root );
			range.setStartBefore( element );
			range.setEndAfter( element );
			cache.ranges = new CKEDITOR.dom.rangeList( range );

			// Put this element in the cache.
			cache.selectedElement = cache.startElement = element;
			cache.type = CKEDITOR.SELECTION_ELEMENT;

			// Properties that will not be available when isFake.
			cache.selectedText = cache.nativeSel = null;

			this.isFake = 1;
			this.rev = nextRev++;

			// Save this selection, so it can be returned by editor.getSelection().
			editor._.fakeSelection = this;

			// Fire selectionchange, just like a normal selection.
			this.root.fire( 'selectionchange' );
		},

		/**
		 * Checks whether selection is placed in hidden element.
		 *
		 * This method is to be used to verify whether fake selection
		 * (see {@link #fake}) is still hidden.
		 *
		 * **Note:** this method should be executed on real selection - e.g.:
		 *
		 *		editor.getSelection( true ).isHidden();
		 *
		 * @returns {Boolean}
		 */
		isHidden: function() {
			var el = this.getCommonAncestor();

			if ( el && el.type == CKEDITOR.NODE_TEXT )
				el = el.getParent();

			return !!( el && el.data( 'cke-hidden-sel' ) );
		},

		/**
		 * Checks if the selection contains an HTML element inside a table.
		 * Returns `false` for text selection inside a table (e.g. it will return `false`
		 * for text selected in one cell).
		 *
		 *		editor.getSelection().isInTable();
		 *
		 * @since 4.7.0
		 * @param {Boolean} [allowPartialSelection=false] Whether a partial cell selection should be included.
		 * Added in 4.7.2.
		 * @returns {Boolean}
		 */
		isInTable: function( allowPartialSelection ) {
			return isTableSelection( this.getRanges(), allowPartialSelection );
		},

		/**
		 * Checks if the selection contains only one range which is collapsed.
		 *
		 *		if ( editor.getSelection().isCollapsed() ) {
		 *			// Do something when the selection is collapsed.
		 *		}
		 *
		 * @since 4.7.3
		 * @returns {Boolean}
		 */
		isCollapsed: function() {
			var ranges = this.getRanges();

			return ranges.length === 1 && ranges[ 0 ].collapsed;
		},

		/**
		 * Creates a bookmark for each range of this selection (from {@link #getRanges})
		 * by calling the {@link CKEDITOR.dom.range#createBookmark} method,
		 * with extra care taken to avoid interference among those ranges. The arguments
		 * received are the same as with the underlying range method.
		 *
		 *		var bookmarks = editor.getSelection().createBookmarks();
		 *
		 * @returns {Array} Array of bookmarks for each range.
		 */
		createBookmarks: function( serializable ) {
			var bookmark = this.getRanges().createBookmarks( serializable );
			this.isFake && ( bookmark.isFake = 1 );
			return bookmark;
		},

		/**
		 * Creates a bookmark for each range of this selection (from {@link #getRanges})
		 * by calling the {@link CKEDITOR.dom.range#createBookmark2} method,
		 * with extra care taken to avoid interference among those ranges. The arguments
		 * received are the same as with the underlying range method.
		 *
		 *		var bookmarks = editor.getSelection().createBookmarks2();
		 *
		 * @returns {Array} Array of bookmarks for each range.
		 */
		createBookmarks2: function( normalized ) {
			var bookmark = this.getRanges().createBookmarks2( normalized );
			this.isFake && ( bookmark.isFake = 1 );
			return bookmark;
		},

		/**
		 * Selects the virtual ranges denoted by the bookmarks by calling {@link #selectRanges}.
		 *
		 *		var bookmarks = editor.getSelection().createBookmarks();
		 *		editor.getSelection().selectBookmarks( bookmarks );
		 *
		 * @param {Array} bookmarks The bookmarks representing ranges to be selected.
		 * @returns {CKEDITOR.dom.selection} This selection object, after the ranges were selected.
		 */
		selectBookmarks: function( bookmarks ) {
			var ranges = [],
				node;

			for ( var i = 0; i < bookmarks.length; i++ ) {
				var range = new CKEDITOR.dom.range( this.root );
				range.moveToBookmark( bookmarks[ i ] );
				ranges.push( range );
			}

			// It may happen that the content change during loading, before selection is set so bookmark leads to text node.
			if ( bookmarks.isFake ) {
				node = isTableSelection( ranges ) ? ranges[ 0 ]._getTableElement() : ranges[ 0 ].getEnclosedNode();

				if ( !node || node.type != CKEDITOR.NODE_ELEMENT ) {
					CKEDITOR.warn( 'selection-not-fake' );
					bookmarks.isFake = 0;
				}
			}

			if ( bookmarks.isFake && !isTableSelection( ranges ) ) {
				this.fake( node );
			} else {
				this.selectRanges( ranges );
			}

			return this;
		},

		/**
		 * Retrieves the common ancestor node of the first range and the last range.
		 *
		 *		var ancestor = editor.getSelection().getCommonAncestor();
		 *
		 * @returns {CKEDITOR.dom.element} The common ancestor of the selection or `null` if selection is empty.
		 */
		getCommonAncestor: function() {
			var ranges = this.getRanges();
			if ( !ranges.length )
				return null;

			var startNode = ranges[ 0 ].startContainer,
				endNode = ranges[ ranges.length - 1 ].endContainer;
			return startNode.getCommonAncestor( endNode );
		},

		/**
		 * Moves the scrollbar to the starting position of the current selection.
		 *
		 *		editor.getSelection().scrollIntoView();
		 */
		scrollIntoView: function() {
			// Scrolls the first range into view.
			if ( this.type != CKEDITOR.SELECTION_NONE )
				this.getRanges()[ 0 ].scrollIntoView();
		},

		/**
		 * Remove all the selection ranges from the document.
		 */
		removeAllRanges: function() {
			// Don't clear selection outside this selection's root (https://dev.ckeditor.com/ticket/11500).
			if ( this.getType() == CKEDITOR.SELECTION_NONE )
				return;

			var nativ = this.getNative();

			try {
				nativ && nativ[ isMSSelection ? 'empty' : 'removeAllRanges' ]();
			} catch ( er ) {}

			this.reset();
		}
	};

} )();


/**
 * Fired when selection inside editor has been changed. Note that this event
 * is fired only when selection's start element (container of a selecion start)
 * changes, not on every possible selection change. Thanks to that `selectionChange`
 * is fired less frequently, but on every context
 * (the {@link CKEDITOR.editor#elementPath elements path} holding selection's start) change.
 *
 * @event selectionChange
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param data
 * @param {CKEDITOR.dom.selection} data.selection
 * @param {CKEDITOR.dom.elementPath} data.path
 */

/**
 * Selection's revision. This value is incremented every time new
 * selection is created or existing one is modified.
 *
 * @since 4.3.0
 * @readonly
 * @property {Number} rev
 */

/**
 * Document in which selection is anchored.
 *
 * @readonly
 * @property {CKEDITOR.dom.document} document
 */

/**
 * Selection's root element.
 *
 * @readonly
 * @property {CKEDITOR.dom.element} root
 */

/**
 * Whether selection is locked (cannot be modified).
 *
 * See {@link #lock} and {@link #unlock} methods.
 *
 * @readonly
 * @property {Boolean} isLocked
 */

/**
 * Whether selection is a fake selection.
 *
 * See {@link #fake} method.
 *
 * @readonly
 * @property {Boolean} isFake
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

'use strict';

/**
 * Block style type.
 *
 * Read more in the {@link CKEDITOR.style} class documentation.
 *
 * @readonly
 * @property {Number} [=1]
 * @member CKEDITOR
 */
CKEDITOR.STYLE_BLOCK = 1;

/**
 * Inline style type.
 *
 * Read more in the {@link CKEDITOR.style} class documentation.
 *
 * @readonly
 * @property {Number} [=2]
 * @member CKEDITOR
 */
CKEDITOR.STYLE_INLINE = 2;

/**
 * Object style type.
 *
 * Read more in the {@link CKEDITOR.style} class documentation.
 *
 * @readonly
 * @property {Number} [=3]
 * @member CKEDITOR
 */
CKEDITOR.STYLE_OBJECT = 3;

( function() {
	var blockElements = {
			address: 1, div: 1, h1: 1, h2: 1, h3: 1, h4: 1, h5: 1, h6: 1, p: 1,
			pre: 1, section: 1, header: 1, footer: 1, nav: 1, article: 1, aside: 1, figure: 1,
			dialog: 1, hgroup: 1, time: 1, meter: 1, menu: 1, command: 1, keygen: 1, output: 1,
			progress: 1, details: 1, datagrid: 1, datalist: 1
		},

		objectElements = {
			a: 1, blockquote: 1, embed: 1, hr: 1, img: 1, li: 1, object: 1, ol: 1, table: 1, td: 1,
			tr: 1, th: 1, ul: 1, dl: 1, dt: 1, dd: 1, form: 1, audio: 1, video: 1
		};

	var semicolonFixRegex = /\s*(?:;\s*|$)/,
		varRegex = /#\((.+?)\)/g;

	var notBookmark = CKEDITOR.dom.walker.bookmark( 0, 1 ),
		nonWhitespaces = CKEDITOR.dom.walker.whitespaces( 1 );

	/**
	 * A class representing a style instance for the specific style definition.
	 * In this approach, a style is a set of properties, like attributes and styles,
	 * which can be applied to and removed from a {@link CKEDITOR.dom.selection selection} through
	 * {@link CKEDITOR.editor editor} methods: {@link CKEDITOR.editor#applyStyle} and {@link CKEDITOR.editor#removeStyle},
	 * respectively.
	 *
	 * Three default style types are available: {@link CKEDITOR#STYLE_BLOCK STYLE_BLOCK}, {@link CKEDITOR#STYLE_INLINE STYLE_INLINE},
	 * and {@link CKEDITOR#STYLE_OBJECT STYLE_OBJECT}. Based on its type, a style heavily changes its behavior.
	 * You can read more about style types in the {@glink features/styles#style-types Style Types section of the Styles guide}.
	 *
	 * It is possible to define a custom style type by subclassing this class by using the {@link #addCustomHandler} method.
	 * However, because of great complexity of the styles handling job, it is only possible in very specific cases.
	 *
	 * ### Usage
	 *
	 * Basic usage:
	 *
	 *		// Define a block style.
	 *		var style = new CKEDITOR.style( { element: 'h1' } );
	 *
	 *		// Considering the following selection:
	 *		// <p>Foo</p><p>Bar^</p>
	 *		// Executing:
	 *		editor.applyStyle( style );
	 *		// Will give:
	 *		// <p>Foo</p><h1>Bar^</h1>
	 *		style.checkActive( editor.elementPath(), editor ); // -> true
	 *
	 *		editor.removeStyle( style );
	 *		// Will give:
	 *		// <p>Foo</p><p>Bar^</p>
	 *
	 *		style.checkActive( editor.elementPath(), editor ); // -> false
	 *
	 * Object style:
	 *
	 *		// Define an object style.
	 *		var style = new CKEDITOR.style( { element: 'img', attributes: { 'class': 'foo' } } );
	 *
	 *		// Considering the following selection:
	 *		// <p><img src="bar.png" alt="" />Foo^</p>
	 *		// Executing:
	 *		editor.applyStyle( style );
	 *		// Will not apply the style, because the image is not selected.
	 *		// You can check if a style can be applied on the current selection with:
	 *		style.checkApplicable( editor.elementPath(), editor ); // -> false
	 *
	 *		// Considering the following selection:
	 *		// <p>[<img src="bar.png" alt="" />]Foo</p>
	 *		// Executing
	 *		editor.applyStyle( style );
	 *		// Will give:
	 *		// <p>[<img src="bar.png" alt="" class="foo" />]Foo</p>
	 *
	 * ### API changes introduced in CKEditor 4.4.0
	 *
	 * Before CKEditor 4.4.0 all style instances had no access at all to the {@link CKEDITOR.editor editor instance}
	 * within which the style is used. Neither the style constructor, nor style methods were requiring
	 * passing the editor instance which made styles independent of the editor and hence its settings and state.
	 * This design decision came from CKEditor 3; it started causing problems and became an unsolvable obstacle for
	 * the {@link CKEDITOR.style.customHandlers.widget widget style handler} which we introduced in CKEditor 4.4.
	 *
	 * There were two possible solutions. Passing an editor instance to the style constructor or to every method.
	 * The first approach would be clean, however, having in mind the backward compatibility, we did not decide
	 * to go for it. It would bind the style to one editor instance, making it unusable with other editor instances.
	 * That could break many implementations reusing styles between editors. Therefore, we decided to take the longer
	 * but safer path &mdash; the editor instance became an argument for nearly all style methods, however,
	 * for backward compatibility reasons, all these methods will work without it. Even the newly
	 * implemented {@link CKEDITOR.style.customHandlers.widget widget style handler}'s methods will not fail,
	 * although they will also not work by aborting at an early stage.
	 *
	 * Therefore, you can safely upgrade to CKEditor 4.4.0 even if you use style methods without providing
	 * the editor instance. You must only align your code if your implementation should handle widget styles
	 * or any other custom style handler. Of course, we recommend doing this in any case to avoid potential
	 * problems in the future.
	 *
	 * @class
	 * @constructor Creates a style class instance.
	 * @param {CKEDITOR.style.definition} styleDefinition
	 * @param variablesValues
	 */
	CKEDITOR.style = function( styleDefinition, variablesValues ) {
		if ( typeof styleDefinition.type == 'string' )
			return new CKEDITOR.style.customHandlers[ styleDefinition.type ]( styleDefinition );

		// Inline style text as attribute should be converted
		// to styles object.
		var attrs = styleDefinition.attributes;
		if ( attrs && attrs.style ) {
			styleDefinition.styles = CKEDITOR.tools.extend( {},
				styleDefinition.styles, CKEDITOR.tools.parseCssText( attrs.style ) );
			delete attrs.style;
		}

		if ( variablesValues ) {
			styleDefinition = CKEDITOR.tools.clone( styleDefinition );

			replaceVariables( styleDefinition.attributes, variablesValues );
			replaceVariables( styleDefinition.styles, variablesValues );
		}

		var element = this.element = styleDefinition.element ?
			(
				typeof styleDefinition.element == 'string' ?
					styleDefinition.element.toLowerCase() : styleDefinition.element
			) : '*';

		this.type = styleDefinition.type ||
			(
				blockElements[ element ] ? CKEDITOR.STYLE_BLOCK :
				objectElements[ element ] ? CKEDITOR.STYLE_OBJECT :
				CKEDITOR.STYLE_INLINE
			);

		// If the 'element' property is an object with a set of possible element, it will be applied like an object style: only to existing elements
		if ( typeof this.element == 'object' )
			this.type = CKEDITOR.STYLE_OBJECT;

		this._ = {
			definition: styleDefinition
		};
	};

	CKEDITOR.style.prototype = {
		/**
		 * Applies the style on the editor's current selection.
		 *
		 * Before the style is applied, the method checks if the {@link #checkApplicable style is applicable}.
		 *
		 * **Note:** The recommended way of applying the style is by using the
		 * {@link CKEDITOR.editor#applyStyle} method, which is a shorthand for this method.
		 *
		 * @param {CKEDITOR.editor/CKEDITOR.dom.document} editor The editor instance in which
		 * the style will be applied.
		 * A {@link CKEDITOR.dom.document} instance is accepted for backward compatibility
		 * reasons, although since CKEditor 4.4.0 this type of argument is deprecated. Read more about
		 * the signature change in the {@link CKEDITOR.style} documentation.
		 */
		apply: function( editor ) {
			// Backward compatibility.
			if ( editor instanceof CKEDITOR.dom.document )
				return applyStyleOnSelection.call( this, editor.getSelection() );

			if ( this.checkApplicable( editor.elementPath(), editor ) ) {
				var initialEnterMode = this._.enterMode;

				// See comment in removeStyle.
				if ( !initialEnterMode )
					this._.enterMode = editor.activeEnterMode;
				applyStyleOnSelection.call( this, editor.getSelection(), 0, editor );
				this._.enterMode = initialEnterMode;
			}
		},

		/**
		 * Removes the style from the editor's current selection.
		 *
		 * Before the style is applied, the method checks if {@link #checkApplicable style could be applied}.
		 *
		 * **Note:** The recommended way of removing the style is by using the
		 * {@link CKEDITOR.editor#removeStyle} method, which is a shorthand for this method.
		 *
		 * @param {CKEDITOR.editor/CKEDITOR.dom.document} editor The editor instance in which
		 * the style will be removed.
		 * A {@link CKEDITOR.dom.document} instance is accepted for backward compatibility
		 * reasons, although since CKEditor 4.4.0 this type of argument is deprecated. Read more about
		 * the signature change in the {@link CKEDITOR.style} documentation.
		 */
		remove: function( editor ) {
			// Backward compatibility.
			if ( editor instanceof CKEDITOR.dom.document )
				return applyStyleOnSelection.call( this, editor.getSelection(), 1 );

			if ( this.checkApplicable( editor.elementPath(), editor ) ) {
				var initialEnterMode = this._.enterMode;

				// Before CKEditor 4.4.0 style knew nothing about editor, so in order to provide enterMode
				// which should be used developers were forced to hack the style object (see https://dev.ckeditor.com/ticket/10190).
				// Since CKEditor 4.4.0 style knows about editor (at least when it's being applied/removed), but we
				// use _.enterMode for backward compatibility with those hacks.
				// Note: we should not change style's enter mode if it was already set.
				if ( !initialEnterMode )
					this._.enterMode = editor.activeEnterMode;
				applyStyleOnSelection.call( this, editor.getSelection(), 1, editor );
				this._.enterMode = initialEnterMode;
			}
		},

		/**
		 * Applies the style on the provided range. Unlike {@link #apply} this
		 * method does not take care of setting the selection, however, the range
		 * is updated to the correct place.
		 *
		 * **Note:** If you want to apply the style on the editor selection,
		 * you probably want to use {@link CKEDITOR.editor#applyStyle}.
		 *
		 * @param {CKEDITOR.dom.range} range
		 * @param {CKEDITOR.editor} editor The editor instance. Required argument since
		 * CKEditor 4.4. The style system will work without it, but it is highly
		 * recommended to provide it for integration with all features.  Read more about
		 * the signature change in the {@link CKEDITOR.style} documentation.
		 */
		applyToRange: function( range ) {
			this.applyToRange =
				this.type == CKEDITOR.STYLE_INLINE ? applyInlineStyle :
				this.type == CKEDITOR.STYLE_BLOCK ? applyBlockStyle :
				this.type == CKEDITOR.STYLE_OBJECT ? applyObjectStyle :
				null;

			return this.applyToRange( range );
		},

		/**
		 * Removes the style from the provided range. Unlike {@link #remove} this
		 * method does not take care of setting the selection, however, the range
		 * is updated to the correct place.
		 *
		 * **Note:** If you want to remove the style from the editor selection,
		 * you probably want to use {@link CKEDITOR.editor#removeStyle}.
		 *
		 * @param {CKEDITOR.dom.range} range
		 * @param {CKEDITOR.editor} editor The editor instance. Required argument since
		 * CKEditor 4.4. The style system will work without it, but it is highly
		 * recommended to provide it for integration with all features. Read more about
		 * the signature change in the {@link CKEDITOR.style} documentation.
		 */
		removeFromRange: function( range ) {
			this.removeFromRange =
				this.type == CKEDITOR.STYLE_INLINE ? removeInlineStyle :
				this.type == CKEDITOR.STYLE_BLOCK ? removeBlockStyle :
				this.type == CKEDITOR.STYLE_OBJECT ? removeObjectStyle :
				null;

			return this.removeFromRange( range );
		},

		/**
		 * Applies the style to the element. This method bypasses all checks
		 * and applies the style attributes directly on the provided element. Use with caution.
		 *
		 * See {@link CKEDITOR.editor#applyStyle}.
		 *
		 * @param {CKEDITOR.dom.element} element
		 * @param {CKEDITOR.editor} editor The editor instance. Required argument since
		 * CKEditor 4.4. The style system will work without it, but it is highly
		 * recommended to provide it for integration with all features. Read more about
		 * the signature change in the {@link CKEDITOR.style} documentation.
		 */
		applyToObject: function( element ) {
			setupElement( element, this );
		},

		/**
		 * Gets the style state inside the elements path.
		 *
		 * @param {CKEDITOR.dom.elementPath} elementPath
		 * @param {CKEDITOR.editor} editor The editor instance. Required argument since
		 * CKEditor 4.4. The style system will work without it, but it is highly
		 * recommended to provide it for integration with all features. Read more about
		 * the signature change in the {@link CKEDITOR.style} documentation.
		 * @returns {Boolean} `true` if the element is active in the elements path.
		 */
		checkActive: function( elementPath, editor ) {
			switch ( this.type ) {
				case CKEDITOR.STYLE_BLOCK:
					return this.checkElementRemovable( elementPath.block || elementPath.blockLimit, true, editor );

				case CKEDITOR.STYLE_OBJECT:
				case CKEDITOR.STYLE_INLINE:

					var elements = elementPath.elements;

					for ( var i = 0, element; i < elements.length; i++ ) {
						element = elements[ i ];

						if ( this.type == CKEDITOR.STYLE_INLINE && ( element == elementPath.block || element == elementPath.blockLimit ) )
							continue;

						if ( this.type == CKEDITOR.STYLE_OBJECT ) {
							var name = element.getName();
							if ( !( typeof this.element == 'string' ? name == this.element : name in this.element ) )
								continue;
						}

						if ( this.checkElementRemovable( element, true, editor ) )
							return true;
					}
			}
			return false;
		},

		/**
		 * Whether this style can be applied at the specified elements path.
		 *
		 * @param {CKEDITOR.dom.elementPath} elementPath The elements path to
		 * check the style against.
		 * @param {CKEDITOR.editor} editor The editor instance. Required argument since
		 * CKEditor 4.4. The style system will work without it, but it is highly
		 * recommended to provide it for integration with all features. Read more about
		 * the signature change in the {@link CKEDITOR.style} documentation.
		 * @param {CKEDITOR.filter} [filter] If defined, the style will be
		 * checked against this filter as well.
		 * @returns {Boolean} `true` if this style can be applied at the elements path.
		 */
		checkApplicable: function( elementPath, editor, filter ) {
			// Backward compatibility.
			if ( editor && editor instanceof CKEDITOR.filter )
				filter = editor;

			if ( filter && !filter.check( this ) )
				return false;

			switch ( this.type ) {
				case CKEDITOR.STYLE_OBJECT:
					return !!elementPath.contains( this.element );
				case CKEDITOR.STYLE_BLOCK:
					return !!elementPath.blockLimit.getDtd()[ this.element ];
			}

			return true;
		},

		/**
		 * Checks if the element matches the current style definition.
		 *
		 * @param {CKEDITOR.dom.element} element
		 * @param {Boolean} fullMatch
		 * @param {CKEDITOR.editor} editor The editor instance. Required argument since
		 * CKEditor 4.4. The style system will work without it, but it is highly
		 * recommended to provide it for integration with all features. Read more about
		 * the signature change in the {@link CKEDITOR.style} documentation.
		 * @returns {Boolean}
		 */
		checkElementMatch: function( element, fullMatch ) {
			var def = this._.definition;

			if ( !element || !def.ignoreReadonly && element.isReadOnly() )
				return false;

			var attribs,
				name = element.getName();

			// If the element name is the same as the style name.
			if ( typeof this.element == 'string' ? name == this.element : name in this.element ) {
				// If no attributes are defined in the element.
				if ( !fullMatch && !element.hasAttributes() )
					return true;

				attribs = getAttributesForComparison( def );

				if ( attribs._length ) {
					for ( var attName in attribs ) {
						if ( attName == '_length' )
							continue;

						var elementAttr = element.getAttribute( attName ) || '';

						// Special treatment for 'style' attribute is required.
						if ( attName == 'style' ? compareCssText( attribs[ attName ], elementAttr ) : attribs[ attName ] == elementAttr ) {
							if ( !fullMatch )
								return true;
						} else if ( fullMatch ) {
							return false;
						}
					}
					if ( fullMatch )
						return true;
				} else {
					return true;
				}
			}

			return false;
		},

		/**
		 * Checks if an element, or any of its attributes, is removable by the
		 * current style definition.
		 *
		 * @param {CKEDITOR.dom.element} element
		 * @param {Boolean} fullMatch
		 * @param {CKEDITOR.editor} editor The editor instance. Required argument since
		 * CKEditor 4.4. The style system will work without it, but it is highly
		 * recommended to provide it for integration with all features. Read more about
		 * the signature change in the {@link CKEDITOR.style} documentation.
		 * @returns {Boolean}
		 */
		checkElementRemovable: function( element, fullMatch, editor ) {
			// Check element matches the style itself.
			if ( this.checkElementMatch( element, fullMatch, editor ) )
				return true;

			// Check if the element matches the style overrides.
			var override = getOverrides( this )[ element.getName() ];
			if ( override ) {
				var attribs, attName;

				// If no attributes have been defined, remove the element.
				if ( !( attribs = override.attributes ) )
					return true;

				for ( var i = 0; i < attribs.length; i++ ) {
					attName = attribs[ i ][ 0 ];
					var actualAttrValue = element.getAttribute( attName );
					if ( actualAttrValue ) {
						var attValue = attribs[ i ][ 1 ];

						// Remove the attribute if:
						//    - The override definition value is null;
						//    - The override definition value is a string that
						//      matches the attribute value exactly.
						//    - The override definition value is a regex that
						//      has matches in the attribute value.
						if ( attValue === null )
							return true;
						if ( typeof attValue == 'string' ) {
							if ( actualAttrValue == attValue )
								return true;
						} else if ( attValue.test( actualAttrValue ) ) {
							return true;
						}
					}
				}
			}
			return false;
		},

		/**
		 * Builds the preview HTML based on the styles definition.
		 *
		 * @param {String} [label] The label used in the style preview.
		 * @return {String} The HTML of preview.
		 */
		buildPreview: function( label ) {
			var styleDefinition = this._.definition,
				html = [],
				elementName = styleDefinition.element;

			// Avoid <bdo> in the preview.
			if ( elementName == 'bdo' )
				elementName = 'span';

			html = [ '<', elementName ];

			// Assign all defined attributes.
			var attribs = styleDefinition.attributes;
			if ( attribs ) {
				for ( var att in attribs )
					html.push( ' ', att, '="', attribs[ att ], '"' );
			}

			// Assign the style attribute.
			var cssStyle = CKEDITOR.style.getStyleText( styleDefinition );
			if ( cssStyle )
				html.push( ' style="', cssStyle, '"' );

			html.push( '>', ( label || styleDefinition.name ), '</', elementName, '>' );

			return html.join( '' );
		},

		/**
		 * Returns the style definition.
		 *
		 * @since 4.1.0
		 * @returns {Object}
		 */
		getDefinition: function() {
			return this._.definition;
		}

		/**
		 * If defined (for example by {@link CKEDITOR.style#addCustomHandler custom style handler}), it returns
		 * the {@link CKEDITOR.filter.allowedContentRules allowed content rules} which should be added to the
		 * {@link CKEDITOR.filter} when enabling this style.
		 *
		 * **Note:** This method is not defined in the {@link CKEDITOR.style} class.
		 *
		 * @since 4.4.0
		 * @method toAllowedContentRules
		 * @param {CKEDITOR.editor} [editor] The editor instance.
		 * @returns {CKEDITOR.filter.allowedContentRules} The rules that should represent this style in the {@link CKEDITOR.filter}.
		 */
	};

	/**
	 * Builds the inline style text based on the style definition.
	 *
	 * @static
	 * @param styleDefinition
	 * @returns {String} Inline style text.
	 */
	CKEDITOR.style.getStyleText = function( styleDefinition ) {
		// If we have already computed it, just return it.
		var stylesDef = styleDefinition._ST;
		if ( stylesDef )
			return stylesDef;

		stylesDef = styleDefinition.styles;

		// Builds the StyleText.
		var stylesText = ( styleDefinition.attributes && styleDefinition.attributes.style ) || '',
			specialStylesText = '';

		if ( stylesText.length )
			stylesText = stylesText.replace( semicolonFixRegex, ';' );

		for ( var style in stylesDef ) {
			var styleVal = stylesDef[ style ],
				text = ( style + ':' + styleVal ).replace( semicolonFixRegex, ';' );

			// Some browsers don't support 'inherit' property value, leave them intact. (https://dev.ckeditor.com/ticket/5242)
			if ( styleVal == 'inherit' )
				specialStylesText += text;
			else
				stylesText += text;
		}

		// Browsers make some changes to the style when applying them. So, here
		// we normalize it to the browser format.
		if ( stylesText.length )
			stylesText = CKEDITOR.tools.normalizeCssText( stylesText, true );

		stylesText += specialStylesText;

		// Return it, saving it to the next request.
		return ( styleDefinition._ST = stylesText );
	};

	/**
	 * Namespace containing custom style handlers added with {@link CKEDITOR.style#addCustomHandler}.
	 *
	 * @since 4.4.0
	 * @class
	 * @singleton
	 */
	CKEDITOR.style.customHandlers = {};

	/**
	 * Creates a {@link CKEDITOR.style} subclass and registers it in the style system.
	 * Registered class will be used as a handler for a style of this type. This allows
	 * to extend the styles system, which by default uses only the {@link CKEDITOR.style}, with
	 * new functionality. Registered classes are accessible in the {@link CKEDITOR.style.customHandlers}.
	 *
	 * ### The Style Class Definition
	 *
	 * The definition object is used to override properties in a prototype inherited
	 * from the {@link CKEDITOR.style} class. It must contain a `type` property which is
	 * a name of the new type and therefore it must be unique. The default style types
	 * ({@link CKEDITOR#STYLE_BLOCK STYLE_BLOCK}, {@link CKEDITOR#STYLE_INLINE STYLE_INLINE},
	 * and {@link CKEDITOR#STYLE_OBJECT STYLE_OBJECT}) are integers, but for easier identification
	 * it is recommended to use strings as custom type names.
	 *
	 * Besides `type`, the definition may contain two more special properties:
	 *
	 *  * `setup {Function}` &ndash; An optional callback executed when a style instance is created.
	 * Like the style constructor, it is executed in style context and with the style definition as an argument.
	 *  * `assignedTo {Number}` &ndash; Can be set to one of the default style types. Some editor
	 * features like the Styles drop-down assign styles to one of the default groups based on
	 * the style type. By using this property it is possible to notify them to which group this
	 * custom style should be assigned. It defaults to the {@link CKEDITOR#STYLE_OBJECT}.
	 *
	 * Other properties of the definition object will just be used to extend the prototype inherited
	 * from the {@link CKEDITOR.style} class. So if the definition contains an `apply` method, it will
	 * override the {@link CKEDITOR.style#apply} method.
	 *
	 * ### Usage
	 *
	 * Registering a basic handler:
	 *
	 *		var styleClass = CKEDITOR.style.addCustomHandler( {
	 *			type: 'custom'
	 *		} );
	 *
	 *		var style = new styleClass( { ... } );
	 *		style instanceof styleClass; // -> true
	 *		style instanceof CKEDITOR.style; // -> true
	 *		style.type; // -> 'custom'
	 *
	 * The {@link CKEDITOR.style} constructor used as a factory:
	 *
	 *		var styleClass = CKEDITOR.style.addCustomHandler( {
	 *			type: 'custom'
	 *		} );
	 *
	 *		// Style constructor accepts style definition (do not confuse with style class definition).
	 *		var style = new CKEDITOR.style( { type: 'custom', attributes: ... } );
	 *		style instanceof styleClass; // -> true
	 *
	 * Thanks to that, integration code using styles does not need to know
	 * which style handler it should use. It is determined by the {@link CKEDITOR.style} constructor.
	 *
	 * Overriding existing {@link CKEDITOR.style} methods:
	 *
	 *		var styleClass = CKEDITOR.style.addCustomHandler( {
	 *			type: 'custom',
	 *			apply: function( editor ) {
	 *				console.log( 'apply' );
	 *			},
	 *			remove: function( editor ) {
	 *				console.log( 'remove' );
	 *			}
	 *		} );
	 *
	 *		var style = new CKEDITOR.style( { type: 'custom', attributes: ... } );
	 *		editor.applyStyle( style ); // logged 'apply'
	 *
	 *		style = new CKEDITOR.style( { element: 'img', attributes: { 'class': 'foo' } } );
	 *		editor.applyStyle( style ); // style is really applied if image was selected
	 *
	 * ### Practical Recommendations
	 *
	 * The style handling job, which includes such tasks as applying, removing, checking state, and
	 * checking if a style can be applied, is very complex. Therefore without deep knowledge
	 * about DOM and especially {@link CKEDITOR.dom.range ranges} and {@link CKEDITOR.dom.walker DOM walker} it is impossible
	 * to implement a completely custom style handler able to handle block, inline, and object type styles.
	 * However, it is possible to customize the default implementation by overriding default methods and
	 * reusing them.
	 *
	 * The only style handler which can be implemented from scratch without huge effort is a style
	 * applicable to objects ({@glink features/styles#style-types read more about types}).
	 * Such style can only be applied when a specific object is selected. An example implementation can
	 * be found in the [widget plugin](https://github.com/ckeditor/ckeditor-dev/blob/master/plugins/widget/plugin.js).
	 *
	 * When implementing a style handler from scratch at least the following methods must be defined:
	 *
	 * * {@link CKEDITOR.style#apply apply} and {@link CKEDITOR.style#remove remove},
	 * * {@link CKEDITOR.style#checkElementRemovable checkElementRemovable} and
	 * {@link CKEDITOR.style#checkElementMatch checkElementMatch} &ndash; Note that both methods reuse the same logic,
	 * * {@link CKEDITOR.style#checkActive checkActive} &ndash; Reuses
	 * {@link CKEDITOR.style#checkElementMatch checkElementMatch},
	 * * {@link CKEDITOR.style#toAllowedContentRules toAllowedContentRules} &ndash; Not required, but very useful in
	 * case of a custom style that has to notify the {@link CKEDITOR.filter} which rules it allows when registered.
	 *
	 * @since 4.4.0
	 * @static
	 * @member CKEDITOR.style
	 * @param definition The style class definition.
	 * @returns {CKEDITOR.style} The new style class created for the provided definition.
	 */
	CKEDITOR.style.addCustomHandler = function( definition ) {
		var styleClass = function( styleDefinition ) {
			this._ = {
				definition: styleDefinition
			};

			if ( this.setup )
				this.setup( styleDefinition );
		};

		styleClass.prototype = CKEDITOR.tools.extend(
			// Prototype of CKEDITOR.style.
			CKEDITOR.tools.prototypedCopy( CKEDITOR.style.prototype ),
			// Defaults.
			{
				assignedTo: CKEDITOR.STYLE_OBJECT
			},
			// Passed definition - overrides.
			definition,
			true
		);

		this.customHandlers[ definition.type ] = styleClass;

		return styleClass;
	};

	// Gets the parent element which blocks the styling for an element. This
	// can be done through read-only elements (contenteditable=false) or
	// elements with the "data-nostyle" attribute.
	function getUnstylableParent( element, root ) {
		var unstylable, editable;

		while ( ( element = element.getParent() ) ) {
			if ( element.equals( root ) )
				break;

			if ( element.getAttribute( 'data-nostyle' ) )
				unstylable = element;
			else if ( !editable ) {
				var contentEditable = element.getAttribute( 'contentEditable' );

				if ( contentEditable == 'false' )
					unstylable = element;
				else if ( contentEditable == 'true' )
					editable = 1;
			}
		}

		return unstylable;
	}

	var posPrecedingIdenticalContained =
			CKEDITOR.POSITION_PRECEDING | CKEDITOR.POSITION_IDENTICAL | CKEDITOR.POSITION_IS_CONTAINED,
		posFollowingIdenticalContained =
			CKEDITOR.POSITION_FOLLOWING | CKEDITOR.POSITION_IDENTICAL | CKEDITOR.POSITION_IS_CONTAINED;

	// Checks if the current node can be a child of the style element.
	function checkIfNodeCanBeChildOfStyle( def, currentNode, lastNode, nodeName, dtd, nodeIsNoStyle, nodeIsReadonly, includeReadonly ) {
		// Style can be applied to text node.
		if ( !nodeName )
			return 1;

		// Style definitely cannot be applied if DTD or data-nostyle do not allow.
		if ( !dtd[ nodeName ] || nodeIsNoStyle  )
			return 0;

		// Non-editable element cannot be styled is we shouldn't include readonly elements.
		if ( nodeIsReadonly && !includeReadonly  )
			return 0;

		// Check that we haven't passed lastNode yet and that style's childRule allows this style on current element.
		return checkPositionAndRule( currentNode, lastNode, def, posPrecedingIdenticalContained );
	}

	// Check if the style element can be a child of the current
	// node parent or if the element is not defined in the DTD.
	function checkIfStyleCanBeChildOf( def, currentParent, elementName, isUnknownElement ) {
		return currentParent &&
			( ( currentParent.getDtd() || CKEDITOR.dtd.span )[ elementName ] || isUnknownElement ) &&
			( !def.parentRule || def.parentRule( currentParent ) );
	}

	function checkIfStartsRange( nodeName, currentNode, lastNode ) {
		return (
			!nodeName || !CKEDITOR.dtd.$removeEmpty[ nodeName ] ||
			( currentNode.getPosition( lastNode ) | posPrecedingIdenticalContained ) == posPrecedingIdenticalContained
		);
	}

	function checkIfTextOrReadonlyOrEmptyElement( currentNode, nodeIsReadonly ) {
		var nodeType = currentNode.type;
		return nodeType == CKEDITOR.NODE_TEXT || nodeIsReadonly || ( nodeType == CKEDITOR.NODE_ELEMENT && !currentNode.getChildCount() );
	}

	// Checks if position is a subset of posBitFlags and that nodeA fulfills style def rule.
	function checkPositionAndRule( nodeA, nodeB, def, posBitFlags ) {
		return ( nodeA.getPosition( nodeB ) | posBitFlags ) == posBitFlags &&
			( !def.childRule || def.childRule( nodeA ) );
	}

	function applyInlineStyle( range ) {
		var document = range.document;

		if ( range.collapsed ) {
			// Create the element to be inserted in the DOM.
			var collapsedElement = getElement( this, document );

			// Insert the empty element into the DOM at the range position.
			range.insertNode( collapsedElement );

			// Place the selection right inside the empty element.
			range.moveToPosition( collapsedElement, CKEDITOR.POSITION_BEFORE_END );

			return;
		}

		var elementName = this.element,
			def = this._.definition,
			isUnknownElement;

		// Indicates that fully selected read-only elements are to be included in the styling range.
		var ignoreReadonly = def.ignoreReadonly,
			includeReadonly = ignoreReadonly || def.includeReadonly;

		// If the read-only inclusion is not available in the definition, try
		// to get it from the root data (most often it's the editable).
		if ( includeReadonly == null )
			includeReadonly = range.root.getCustomData( 'cke_includeReadonly' );

		// Get the DTD definition for the element. Defaults to "span".
		var dtd = CKEDITOR.dtd[ elementName ];
		if ( !dtd ) {
			isUnknownElement = true;
			dtd = CKEDITOR.dtd.span;
		}

		// Expand the range.
		range.enlarge( CKEDITOR.ENLARGE_INLINE, 1 );
		range.trim();

		// Get the first node to be processed and the last, which concludes the processing.
		var boundaryNodes = range.createBookmark(),
			firstNode = boundaryNodes.startNode,
			lastNode = boundaryNodes.endNode,
			currentNode = firstNode,
			styleRange;

		if ( !ignoreReadonly ) {
			// Check if the boundaries are inside non stylable elements.
			var root = range.getCommonAncestor(),
				firstUnstylable = getUnstylableParent( firstNode, root ),
				lastUnstylable = getUnstylableParent( lastNode, root );

			// If the first element can't be styled, we'll start processing right
			// after its unstylable root.
			if ( firstUnstylable )
				currentNode = firstUnstylable.getNextSourceNode( true );

			// If the last element can't be styled, we'll stop processing on its
			// unstylable root.
			if ( lastUnstylable )
				lastNode = lastUnstylable;
		}

		// Do nothing if the current node now follows the last node to be processed.
		if ( currentNode.getPosition( lastNode ) == CKEDITOR.POSITION_FOLLOWING )
			currentNode = 0;

		while ( currentNode ) {
			var applyStyle = false;

			if ( currentNode.equals( lastNode ) ) {
				currentNode = null;
				applyStyle = true;
			} else {
				var nodeName = currentNode.type == CKEDITOR.NODE_ELEMENT ? currentNode.getName() : null,
					nodeIsReadonly = nodeName && ( currentNode.getAttribute( 'contentEditable' ) == 'false' ),
					nodeIsNoStyle = nodeName && currentNode.getAttribute( 'data-nostyle' );

				// Skip bookmarks or comments.
				if ( ( nodeName && currentNode.data( 'cke-bookmark' ) ) || currentNode.type === CKEDITOR.NODE_COMMENT ) {
					currentNode = currentNode.getNextSourceNode( true );
					continue;
				}

				// Find all nested editables of a non-editable block and apply this style inside them.
				if ( nodeIsReadonly && includeReadonly && CKEDITOR.dtd.$block[ nodeName ] )
					applyStyleOnNestedEditables.call( this, currentNode );

				// Check if the current node can be a child of the style element.
				if ( checkIfNodeCanBeChildOfStyle( def, currentNode, lastNode, nodeName, dtd, nodeIsNoStyle, nodeIsReadonly, includeReadonly ) ) {
					var currentParent = currentNode.getParent();

					// Check if the style element can be a child of the current
					// node parent or if the element is not defined in the DTD.
					if ( checkIfStyleCanBeChildOf( def, currentParent, elementName, isUnknownElement ) ) {
						// This node will be part of our range, so if it has not
						// been started, place its start right before the node.
						// In the case of an element node, it will be included
						// only if it is entirely inside the range.
						if ( !styleRange && checkIfStartsRange( nodeName, currentNode, lastNode ) ) {
							styleRange = range.clone();
							styleRange.setStartBefore( currentNode );
						}

						// Non element nodes, readonly elements, or empty
						// elements can be added completely to the range.
						if ( checkIfTextOrReadonlyOrEmptyElement( currentNode, nodeIsReadonly ) ) {
							var includedNode = currentNode;
							var parentNode;

							// This node is about to be included completely, but,
							// if this is the last node in its parent, we must also
							// check if the parent itself can be added completely
							// to the range, otherwise apply the style immediately.
							while (
								( applyStyle = !includedNode.getNext( notBookmark ) ) &&
								( parentNode = includedNode.getParent(), dtd[ parentNode.getName() ] ) &&
								checkPositionAndRule( parentNode, firstNode, def, posFollowingIdenticalContained )
							) {
								includedNode = parentNode;
							}

							styleRange.setEndAfter( includedNode );

						}
					} else {
						applyStyle = true;
					}
				}
				// Style isn't applicable to current element, so apply style to
				// range ending at previously chosen position, or nowhere if we haven't
				// yet started styleRange.
				else {
					applyStyle = true;
				}

				// Get the next node to be processed.
				// If we're currently on a non-editable element or non-styleable element,
				// then we'll be moved to current node's sibling (or even further), so we'll
				// avoid messing up its content.
				currentNode = currentNode.getNextSourceNode( nodeIsNoStyle || nodeIsReadonly );
			}

			// Apply the style if we have something to which apply it.
			if ( applyStyle && styleRange && !styleRange.collapsed ) {
				// Build the style element, based on the style object definition.
				var styleNode = getElement( this, document ),
					styleHasAttrs = styleNode.hasAttributes();

				// Get the element that holds the entire range.
				var parent = styleRange.getCommonAncestor();

				var removeList = {
					styles: {},
					attrs: {},
					// Styles cannot be removed.
					blockedStyles: {},
					// Attrs cannot be removed.
					blockedAttrs: {}
				};

				var attName, styleName, value;

				// Loop through the parents, removing the redundant attributes
				// from the element to be applied.
				while ( styleNode && parent ) {
					if ( parent.getName() == elementName ) {
						for ( attName in def.attributes ) {
							if ( removeList.blockedAttrs[ attName ] || !( value = parent.getAttribute( styleName ) ) )
								continue;

							if ( styleNode.getAttribute( attName ) == value )
								removeList.attrs[ attName ] = 1;
							else
								removeList.blockedAttrs[ attName ] = 1;
						}

						for ( styleName in def.styles ) {
							if ( removeList.blockedStyles[ styleName ] || !( value = parent.getStyle( styleName ) ) )
								continue;

							if ( styleNode.getStyle( styleName ) == value )
								removeList.styles[ styleName ] = 1;
							else
								removeList.blockedStyles[ styleName ] = 1;
						}
					}

					parent = parent.getParent();
				}

				for ( attName in removeList.attrs )
					styleNode.removeAttribute( attName );

				for ( styleName in removeList.styles )
					styleNode.removeStyle( styleName );

				if ( styleHasAttrs && !styleNode.hasAttributes() )
					styleNode = null;

				if ( styleNode ) {
					// Move the contents of the range to the style element.
					styleRange.extractContents().appendTo( styleNode );

					// Insert it into the range position (it is collapsed after
					// extractContents.
					styleRange.insertNode( styleNode );

					// Here we do some cleanup, removing all duplicated
					// elements from the style element.
					removeFromInsideElement.call( this, styleNode );

					// Let's merge our new style with its neighbors, if possible.
					styleNode.mergeSiblings();

					// As the style system breaks text nodes constantly, let's normalize
					// things for performance.
					// With IE, some paragraphs get broken when calling normalize()
					// repeatedly. Also, for IE, we must normalize body, not documentElement.
					// IE is also known for having a "crash effect" with normalize().
					// We should try to normalize with IE too in some way, somewhere.
					if ( !CKEDITOR.env.ie )
						styleNode.$.normalize();
				}
				// Style already inherit from parents, left just to clear up any internal overrides. (https://dev.ckeditor.com/ticket/5931)
				else {
					styleNode = new CKEDITOR.dom.element( 'span' );
					styleRange.extractContents().appendTo( styleNode );
					styleRange.insertNode( styleNode );
					removeFromInsideElement.call( this, styleNode );
					styleNode.remove( true );
				}

				// Style applied, let's release the range, so it gets
				// re-initialization in the next loop.
				styleRange = null;
			}
		}

		// Remove the bookmark nodes.
		range.moveToBookmark( boundaryNodes );

		// Minimize the result range to exclude empty text nodes. (https://dev.ckeditor.com/ticket/5374)
		range.shrink( CKEDITOR.SHRINK_TEXT );

		// Get inside the remaining element if range.shrink( TEXT ) has failed because of non-editable elements inside.
		// E.g. range.shrink( TEXT ) will not get inside:
		// [<b><i contenteditable="false">x</i></b>]
		// but range.shrink( ELEMENT ) will.
		range.shrink( CKEDITOR.NODE_ELEMENT, true );
	}

	function removeInlineStyle( range ) {
		// Make sure our range has included all "collpased" parent inline nodes so
		// that our operation logic can be simpler.
		range.enlarge( CKEDITOR.ENLARGE_INLINE, 1 );

		var bookmark = range.createBookmark(),
			startNode = bookmark.startNode,
			alwaysRemoveElement = this._.definition.alwaysRemoveElement;

		if ( range.collapsed ) {
			var startPath = new CKEDITOR.dom.elementPath( startNode.getParent(), range.root ),
				// The topmost element in elements path which we should jump out of.
				boundaryElement;

			for ( var i = 0, element; i < startPath.elements.length && ( element = startPath.elements[ i ] ); i++ ) {
				// 1. If it's collaped inside text nodes, try to remove the style from the whole element.
				//
				// 2. Otherwise if it's collapsed on element boundaries, moving the selection
				//  outside the styles instead of removing the whole tag,
				//  also make sure other inner styles were well preserved.(https://dev.ckeditor.com/ticket/3309)
				//
				// 3. Force removing the element even if it's an boundary element when alwaysRemoveElement is true.
				// Without it, the links won't be unlinked if the cursor is placed right before/after it. (https://dev.ckeditor.com/ticket/13062)
				if ( element == startPath.block || element == startPath.blockLimit ) {
					break;
				}

				if ( this.checkElementRemovable( element ) ) {
					var isStart;

					if ( !alwaysRemoveElement && range.collapsed && ( range.checkBoundaryOfElement( element, CKEDITOR.END ) || ( isStart = range.checkBoundaryOfElement( element, CKEDITOR.START ) ) ) ) {
						boundaryElement = element;
						boundaryElement.match = isStart ? 'start' : 'end';
					} else {
						// Before removing the style node, there may be a sibling to the style node
						// that's exactly the same to the one to be removed. To the user, it makes
						// no difference that they're separate entities in the DOM tree. So, merge
						// them before removal.
						element.mergeSiblings();
						if ( element.is( this.element ) ) {
							removeFromElement.call( this, element );
						} else {
							removeOverrides( element, getOverrides( this )[ element.getName() ] );
						}
					}
				}
			}

			// Re-create the style tree after/before the boundary element,
			// the replication start from bookmark start node to define the
			// new range.
			if ( boundaryElement ) {
				var clonedElement = startNode;
				for ( i = 0; ; i++ ) {
					var newElement = startPath.elements[ i ];
					if ( newElement.equals( boundaryElement ) )
						break;
					// Avoid copying any matched element.
					else if ( newElement.match )
						continue;
					else
						newElement = newElement.clone();
					newElement.append( clonedElement );
					clonedElement = newElement;
				}
				clonedElement[ boundaryElement.match == 'start' ? 'insertBefore' : 'insertAfter' ]( boundaryElement );
			}
		} else {
			// Now our range isn't collapsed. Lets walk from the start node to the end
			// node via DFS and remove the styles one-by-one.
			var endNode = bookmark.endNode,
				me = this;

			breakNodes();

			// Now, do the DFS walk.
			var currentNode = startNode;
			while ( !currentNode.equals( endNode ) ) {
				// Need to get the next node first because removeFromElement() can remove
				// the current node from DOM tree.
				var nextNode = currentNode.getNextSourceNode();
				if ( currentNode.type == CKEDITOR.NODE_ELEMENT && this.checkElementRemovable( currentNode ) ) {
					// Remove style from element or overriding element.
					if ( currentNode.getName() == this.element )
						removeFromElement.call( this, currentNode );
					else
						removeOverrides( currentNode, getOverrides( this )[ currentNode.getName() ] );

					// removeFromElement() may have merged the next node with something before
					// the startNode via mergeSiblings(). In that case, the nextNode would
					// contain startNode and we'll have to call breakNodes() again and also
					// reassign the nextNode to something after startNode.
					if ( nextNode.type == CKEDITOR.NODE_ELEMENT && nextNode.contains( startNode ) ) {
						breakNodes();
						nextNode = startNode.getNext();
					}
				}
				currentNode = nextNode;
			}
		}

		range.moveToBookmark( bookmark );
		// See the comment for range.shrink in applyInlineStyle.
		range.shrink( CKEDITOR.NODE_ELEMENT, true );

		// Find out the style ancestor that needs to be broken down at startNode
		// and endNode.
		function breakNodes() {
			var startPath = new CKEDITOR.dom.elementPath( startNode.getParent() ),
				endPath = new CKEDITOR.dom.elementPath( endNode.getParent() ),
				breakStart = null,
				breakEnd = null;

			for ( var i = 0; i < startPath.elements.length; i++ ) {
				var element = startPath.elements[ i ];

				if ( element == startPath.block || element == startPath.blockLimit )
					break;

				if ( me.checkElementRemovable( element, true ) )
					breakStart = element;
			}

			for ( i = 0; i < endPath.elements.length; i++ ) {
				element = endPath.elements[ i ];

				if ( element == endPath.block || element == endPath.blockLimit )
					break;

				if ( me.checkElementRemovable( element, true ) )
					breakEnd = element;
			}

			if ( breakEnd )
				endNode.breakParent( breakEnd );
			if ( breakStart )
				startNode.breakParent( breakStart );
		}
	}

	// Apply style to nested editables inside editablesContainer.
	// @param {CKEDITOR.dom.element} editablesContainer
	// @context CKEDITOR.style
	function applyStyleOnNestedEditables( editablesContainer ) {
		var editables = findNestedEditables( editablesContainer ),
			editable,
			l = editables.length,
			i = 0,
			range = l && new CKEDITOR.dom.range( editablesContainer.getDocument() );

		for ( ; i < l; ++i ) {
			editable = editables[ i ];
			// Check if style is allowed by this editable's ACF.
			if ( checkIfAllowedInEditable( editable, this ) ) {
				range.selectNodeContents( editable );
				applyInlineStyle.call( this, range );
			}
		}
	}

	// Finds nested editables within container. Does not return
	// editables nested in another editable (twice).
	function findNestedEditables( container ) {
		var editables = [];

		container.forEach( function( element ) {
			if ( element.getAttribute( 'contenteditable' ) == 'true' ) {
				editables.push( element );
				return false; // Skip children.
			}
		}, CKEDITOR.NODE_ELEMENT, true );

		return editables;
	}

	// Checks if style is allowed in this editable.
	function checkIfAllowedInEditable( editable, style ) {
		var filter = CKEDITOR.filter.instances[ editable.data( 'cke-filter' ) ];

		return filter ? filter.check( style ) : 1;
	}

	// Checks if style is allowed by iterator's active filter.
	function checkIfAllowedByIterator( iterator, style ) {
		return iterator.activeFilter ? iterator.activeFilter.check( style ) : 1;
	}

	function applyObjectStyle( range ) {
		// Selected or parent element. (https://dev.ckeditor.com/ticket/9651)
		var start = range.getEnclosedNode() || range.getCommonAncestor( false, true ),
			element = new CKEDITOR.dom.elementPath( start, range.root ).contains( this.element, 1 );

		element && !element.isReadOnly() && setupElement( element, this );
	}

	function removeObjectStyle( range ) {
		var parent = range.getCommonAncestor( true, true ),
			element = new CKEDITOR.dom.elementPath( parent, range.root ).contains( this.element, 1 );

		if ( !element )
			return;

		var style = this,
			def = style._.definition,
			attributes = def.attributes;

		// Remove all defined attributes.
		if ( attributes ) {
			for ( var att in attributes )
				element.removeAttribute( att, attributes[ att ] );
		}

		// Assign all defined styles.
		if ( def.styles ) {
			for ( var i in def.styles ) {
				if ( def.styles.hasOwnProperty( i ) )
					element.removeStyle( i );
			}
		}
	}

	function applyBlockStyle( range ) {
		// Serializible bookmarks is needed here since
		// elements may be merged.
		var bookmark = range.createBookmark( true );

		var iterator = range.createIterator();
		iterator.enforceRealBlocks = true;

		// make recognize <br /> tag as a separator in ENTER_BR mode (https://dev.ckeditor.com/ticket/5121)
		if ( this._.enterMode )
			iterator.enlargeBr = ( this._.enterMode != CKEDITOR.ENTER_BR );

		var block,
			doc = range.document,
			newBlock;

		while ( ( block = iterator.getNextParagraph() ) ) {
			if ( !block.isReadOnly() && checkIfAllowedByIterator( iterator, this ) ) {
				newBlock = getElement( this, doc, block );
				replaceBlock( block, newBlock );
			}
		}

		range.moveToBookmark( bookmark );
	}

	function removeBlockStyle( range ) {
		// Serializible bookmarks is needed here since
		// elements may be merged.
		var bookmark = range.createBookmark( 1 );

		var iterator = range.createIterator();
		iterator.enforceRealBlocks = true;
		iterator.enlargeBr = this._.enterMode != CKEDITOR.ENTER_BR;

		var block,
			newBlock;

		while ( ( block = iterator.getNextParagraph() ) ) {
			if ( this.checkElementRemovable( block ) ) {
				// <pre> get special treatment.
				if ( block.is( 'pre' ) ) {
					newBlock = this._.enterMode == CKEDITOR.ENTER_BR ? null :
							range.document.createElement( this._.enterMode == CKEDITOR.ENTER_P ? 'p' : 'div' );

					newBlock && block.copyAttributes( newBlock );
					replaceBlock( block, newBlock );
				} else {
					removeFromElement.call( this, block );
				}
			}
		}

		range.moveToBookmark( bookmark );
	}

	// Replace the original block with new one, with special treatment
	// for <pre> blocks to make sure content format is well preserved, and merging/splitting adjacent
	// when necessary. (https://dev.ckeditor.com/ticket/3188)
	function replaceBlock( block, newBlock ) {
		// Block is to be removed, create a temp element to
		// save contents.
		var removeBlock = !newBlock;
		if ( removeBlock ) {
			newBlock = block.getDocument().createElement( 'div' );
			block.copyAttributes( newBlock );
		}

		var newBlockIsPre = newBlock && newBlock.is( 'pre' ),
			blockIsPre = block.is( 'pre' ),
			isToPre = newBlockIsPre && !blockIsPre,
			isFromPre = !newBlockIsPre && blockIsPre;

		if ( isToPre )
			newBlock = toPre( block, newBlock );
		else if ( isFromPre )
			// Split big <pre> into pieces before start to convert.
			newBlock = fromPres( removeBlock ? [ block.getHtml() ] : splitIntoPres( block ), newBlock );
		else
			block.moveChildren( newBlock );

		newBlock.replace( block );

		if ( newBlockIsPre ) {
			// Merge previous <pre> blocks.
			mergePre( newBlock );
		} else if ( removeBlock ) {
			removeNoAttribsElement( newBlock );
		}
	}

	// Merge a <pre> block with a previous sibling if available.
	function mergePre( preBlock ) {
		var previousBlock;
		if ( !( ( previousBlock = preBlock.getPrevious( nonWhitespaces ) ) && previousBlock.type == CKEDITOR.NODE_ELEMENT && previousBlock.is( 'pre' ) ) )
			return;

		// Merge the previous <pre> block contents into the current <pre>
		// block.
		//
		// Another thing to be careful here is that currentBlock might contain
		// a '\n' at the beginning, and previousBlock might contain a '\n'
		// towards the end. These new lines are not normally displayed but they
		// become visible after merging.
		var mergedHtml = replace( previousBlock.getHtml(), /\n$/, '' ) + '\n\n' +
			replace( preBlock.getHtml(), /^\n/, '' );

		// Krugle: IE normalizes innerHTML from <pre>, breaking whitespaces.
		if ( CKEDITOR.env.ie )
			preBlock.$.outerHTML = '<pre>' + mergedHtml + '</pre>';
		else
			preBlock.setHtml( mergedHtml );

		previousBlock.remove();
	}

	// Split into multiple <pre> blocks separated by double line-break.
	function splitIntoPres( preBlock ) {
		// Exclude the ones at header OR at tail,
		// and ignore bookmark content between them.
		var duoBrRegex = /(\S\s*)\n(?:\s|(<span[^>]+data-cke-bookmark.*?\/span>))*\n(?!$)/gi,
			pres = [],
			splitedHtml = replace( preBlock.getOuterHtml(), duoBrRegex, function( match, charBefore, bookmark ) {
				return charBefore + '</pre>' + bookmark + '<pre>';
			} );

		splitedHtml.replace( /<pre\b.*?>([\s\S]*?)<\/pre>/gi, function( match, preContent ) {
			pres.push( preContent );
		} );
		return pres;
	}

	// Wrapper function of String::replace without considering of head/tail bookmarks nodes.
	function replace( str, regexp, replacement ) {
		var headBookmark = '',
			tailBookmark = '';

		str = str.replace( /(^<span[^>]+data-cke-bookmark.*?\/span>)|(<span[^>]+data-cke-bookmark.*?\/span>$)/gi, function( str, m1, m2 ) {
			m1 && ( headBookmark = m1 );
			m2 && ( tailBookmark = m2 );
			return '';
		} );
		return headBookmark + str.replace( regexp, replacement ) + tailBookmark;
	}

	// Converting a list of <pre> into blocks with format well preserved.
	function fromPres( preHtmls, newBlock ) {
		var docFrag;
		if ( preHtmls.length > 1 )
			docFrag = new CKEDITOR.dom.documentFragment( newBlock.getDocument() );

		for ( var i = 0; i < preHtmls.length; i++ ) {
			var blockHtml = preHtmls[ i ];

			// 1. Trim the first and last line-breaks immediately after and before <pre>,
			// they're not visible.
			blockHtml = blockHtml.replace( /(\r\n|\r)/g, '\n' );
			blockHtml = replace( blockHtml, /^[ \t]*\n/, '' );
			blockHtml = replace( blockHtml, /\n$/, '' );
			// 2. Convert spaces or tabs at the beginning or at the end to &nbsp;
			blockHtml = replace( blockHtml, /^[ \t]+|[ \t]+$/g, function( match, offset ) {
				if ( match.length == 1 ) // one space, preserve it
					return '&nbsp;';
				else if ( !offset ) // beginning of block
					return CKEDITOR.tools.repeat( '&nbsp;', match.length - 1 ) + ' ';
				else // end of block
					return ' ' + CKEDITOR.tools.repeat( '&nbsp;', match.length - 1 );
			} );

			// 3. Convert \n to <BR>.
			// 4. Convert contiguous (i.e. non-singular) spaces or tabs to &nbsp;
			blockHtml = blockHtml.replace( /\n/g, '<br>' );
			blockHtml = blockHtml.replace( /[ \t]{2,}/g, function( match ) {
				return CKEDITOR.tools.repeat( '&nbsp;', match.length - 1 ) + ' ';
			} );

			if ( docFrag ) {
				var newBlockClone = newBlock.clone();
				newBlockClone.setHtml( blockHtml );
				docFrag.append( newBlockClone );
			} else {
				newBlock.setHtml( blockHtml );
			}
		}

		return docFrag || newBlock;
	}

	// Converting from a non-PRE block to a PRE block in formatting operations.
	function toPre( block, newBlock ) {
		var bogus = block.getBogus();
		bogus && bogus.remove();

		// First trim the block content.
		var preHtml = block.getHtml();

		// 1. Trim head/tail spaces, they're not visible.
		preHtml = replace( preHtml, /(?:^[ \t\n\r]+)|(?:[ \t\n\r]+$)/g, '' );
		// 2. Delete ANSI whitespaces immediately before and after <BR> because
		//    they are not visible.
		preHtml = preHtml.replace( /[ \t\r\n]*(<br[^>]*>)[ \t\r\n]*/gi, '$1' );
		// 3. Compress other ANSI whitespaces since they're only visible as one
		//    single space previously.
		// 4. Convert &nbsp; to spaces since &nbsp; is no longer needed in <PRE>.
		preHtml = preHtml.replace( /([ \t\n\r]+|&nbsp;)/g, ' ' );
		// 5. Convert any <BR /> to \n. This must not be done earlier because
		//    the \n would then get compressed.
		preHtml = preHtml.replace( /<br\b[^>]*>/gi, '\n' );

		// Krugle: IE normalizes innerHTML to <pre>, breaking whitespaces.
		if ( CKEDITOR.env.ie ) {
			var temp = block.getDocument().createElement( 'div' );
			temp.append( newBlock );
			newBlock.$.outerHTML = '<pre>' + preHtml + '</pre>';
			newBlock.copyAttributes( temp.getFirst() );
			newBlock = temp.getFirst().remove();
		} else {
			newBlock.setHtml( preHtml );
		}

		return newBlock;
	}

	// Removes a style from an element itself, don't care about its subtree.
	function removeFromElement( element, keepDataAttrs ) {
		var def = this._.definition,
			attributes = def.attributes,
			styles = def.styles,
			overrides = getOverrides( this )[ element.getName() ],
			// If the style is only about the element itself, we have to remove the element.
			removeEmpty = CKEDITOR.tools.isEmpty( attributes ) && CKEDITOR.tools.isEmpty( styles );

		// Remove definition attributes/style from the elemnt.
		for ( var attName in attributes ) {
			// The 'class' element value must match (https://dev.ckeditor.com/ticket/1318).
			if ( ( attName == 'class' || this._.definition.fullMatch ) && element.getAttribute( attName ) != normalizeProperty( attName, attributes[ attName ] ) )
				continue;

			// Do not touch data-* attributes (https://dev.ckeditor.com/ticket/11011) (https://dev.ckeditor.com/ticket/11258).
			if ( keepDataAttrs && attName.slice( 0, 5 ) == 'data-' )
				continue;

			removeEmpty = element.hasAttribute( attName );
			element.removeAttribute( attName );
		}

		for ( var styleName in styles ) {
			// Full match style insist on having fully equivalence. (https://dev.ckeditor.com/ticket/5018)
			if ( this._.definition.fullMatch && element.getStyle( styleName ) != normalizeProperty( styleName, styles[ styleName ], true ) )
				continue;

			removeEmpty = removeEmpty || !!element.getStyle( styleName );
			element.removeStyle( styleName );
		}

		// Remove overrides, but don't remove the element if it's a block element
		removeOverrides( element, overrides, blockElements[ element.getName() ] );

		if ( removeEmpty ) {
			if ( this._.definition.alwaysRemoveElement )
				removeNoAttribsElement( element, 1 );
			else {
				if ( !CKEDITOR.dtd.$block[ element.getName() ] || this._.enterMode == CKEDITOR.ENTER_BR && !element.hasAttributes() )
					removeNoAttribsElement( element );
				else
					element.renameNode( this._.enterMode == CKEDITOR.ENTER_P ? 'p' : 'div' );
			}
		}
	}

	// Removes a style from inside an element. Called on applyStyle to make cleanup
	// before apply. During clean up this function keep data-* attribute in contrast
	// to removeFromElement.
	function removeFromInsideElement( element ) {
		var overrides = getOverrides( this ),
			innerElements = element.getElementsByTag( this.element ),
			innerElement;

		for ( var i = innerElements.count(); --i >= 0; ) {
			innerElement = innerElements.getItem( i );

			// Do not remove elements which are read only (e.g. duplicates inside widgets).
			if ( !innerElement.isReadOnly() )
				removeFromElement.call( this, innerElement, true );
		}

		// Now remove any other element with different name that is
		// defined to be overriden.
		for ( var overrideElement in overrides ) {
			if ( overrideElement != this.element ) {
				innerElements = element.getElementsByTag( overrideElement );

				for ( i = innerElements.count() - 1; i >= 0; i-- ) {
					innerElement = innerElements.getItem( i );

					// Do not remove elements which are read only (e.g. duplicates inside widgets).
					if ( !innerElement.isReadOnly() )
						removeOverrides( innerElement, overrides[ overrideElement ] );
				}
			}
		}
	}

	// Remove overriding styles/attributes from the specific element.
	// Note: Remove the element if no attributes remain.
	// @param {Object} element
	// @param {Object} overrides
	// @param {Boolean} Don't remove the element
	function removeOverrides( element, overrides, dontRemove ) {
		var attributes = overrides && overrides.attributes;

		if ( attributes ) {
			for ( var i = 0; i < attributes.length; i++ ) {
				var attName = attributes[ i ][ 0 ],
					actualAttrValue;

				if ( ( actualAttrValue = element.getAttribute( attName ) ) ) {
					var attValue = attributes[ i ][ 1 ];

					// Remove the attribute if:
					//    - The override definition value is null ;
					//    - The override definition valie is a string that
					//      matches the attribute value exactly.
					//    - The override definition value is a regex that
					//      has matches in the attribute value.
					if ( attValue === null || ( attValue.test && attValue.test( actualAttrValue ) ) || ( typeof attValue == 'string' && actualAttrValue == attValue ) )
						element.removeAttribute( attName );
				}
			}
		}

		if ( !dontRemove )
			removeNoAttribsElement( element );
	}

	// If the element has no more attributes, remove it.
	function removeNoAttribsElement( element, forceRemove ) {
		// If no more attributes remained in the element, remove it,
		// leaving its children.
		if ( !element.hasAttributes() || forceRemove ) {
			if ( CKEDITOR.dtd.$block[ element.getName() ] ) {
				var previous = element.getPrevious( nonWhitespaces ),
					next = element.getNext( nonWhitespaces );

				if ( previous && ( previous.type == CKEDITOR.NODE_TEXT || !previous.isBlockBoundary( { br: 1 } ) ) )
					element.append( 'br', 1 );
				if ( next && ( next.type == CKEDITOR.NODE_TEXT || !next.isBlockBoundary( { br: 1 } ) ) )
					element.append( 'br' );

				element.remove( true );
			} else {
				// Removing elements may open points where merging is possible,
				// so let's cache the first and last nodes for later checking.
				var firstChild = element.getFirst();
				var lastChild = element.getLast();

				element.remove( true );

				if ( firstChild ) {
					// Check the cached nodes for merging.
					firstChild.type == CKEDITOR.NODE_ELEMENT && firstChild.mergeSiblings();

					if ( lastChild && !firstChild.equals( lastChild ) && lastChild.type == CKEDITOR.NODE_ELEMENT )
						lastChild.mergeSiblings();
				}

			}
		}
	}

	function getElement( style, targetDocument, element ) {
		var el,
			elementName = style.element;

		// The "*" element name will always be a span for this function.
		if ( elementName == '*' )
			elementName = 'span';

		// Create the element.
		el = new CKEDITOR.dom.element( elementName, targetDocument );

		// https://dev.ckeditor.com/ticket/6226: attributes should be copied before the new ones are applied
		if ( element )
			element.copyAttributes( el );

		el = setupElement( el, style );

		// Avoid ID duplication.
		if ( targetDocument.getCustomData( 'doc_processing_style' ) && el.hasAttribute( 'id' ) )
			el.removeAttribute( 'id' );
		else
			targetDocument.setCustomData( 'doc_processing_style', 1 );

		return el;
	}

	function setupElement( el, style ) {
		var def = style._.definition,
			attributes = def.attributes,
			styles = CKEDITOR.style.getStyleText( def );

		// Assign all defined attributes.
		if ( attributes ) {
			for ( var att in attributes )
				el.setAttribute( att, attributes[ att ] );
		}

		// Assign all defined styles.
		if ( styles )
			el.setAttribute( 'style', styles );

		el.getDocument().removeCustomData( 'doc_processing_style' );

		return el;
	}

	function replaceVariables( list, variablesValues ) {
		for ( var item in list ) {
			list[ item ] = list[ item ].replace( varRegex, function( match, varName ) {
				return variablesValues[ varName ];
			} );
		}
	}

	// Returns an object that can be used for style matching comparison.
	// Attributes names and values are all lowercased, and the styles get
	// merged with the style attribute.
	function getAttributesForComparison( styleDefinition ) {
		// If we have already computed it, just return it.
		var attribs = styleDefinition._AC;
		if ( attribs )
			return attribs;

		attribs = {};

		var length = 0;

		// Loop through all defined attributes.
		var styleAttribs = styleDefinition.attributes;
		if ( styleAttribs ) {
			for ( var styleAtt in styleAttribs ) {
				length++;
				attribs[ styleAtt ] = styleAttribs[ styleAtt ];
			}
		}

		// Includes the style definitions.
		var styleText = CKEDITOR.style.getStyleText( styleDefinition );
		if ( styleText ) {
			if ( !attribs.style )
				length++;
			attribs.style = styleText;
		}

		// Appends the "length" information to the object.
		attribs._length = length;

		// Return it, saving it to the next request.
		return ( styleDefinition._AC = attribs );
	}

	// Get the the collection used to compare the elements and attributes,
	// defined in this style overrides, with other element. All information in
	// it is lowercased.
	// @param {CKEDITOR.style} style
	function getOverrides( style ) {
		if ( style._.overrides )
			return style._.overrides;

		var overrides = ( style._.overrides = {} ),
			definition = style._.definition.overrides;

		if ( definition ) {
			// The override description can be a string, object or array.
			// Internally, well handle arrays only, so transform it if needed.
			if ( !CKEDITOR.tools.isArray( definition ) )
				definition = [ definition ];

			// Loop through all override definitions.
			for ( var i = 0; i < definition.length; i++ ) {
				var override = definition[ i ],
					elementName,
					overrideEl,
					attrs;

				// If can be a string with the element name.
				if ( typeof override == 'string' )
					elementName = override.toLowerCase();
				// Or an object.
				else {
					elementName = override.element ? override.element.toLowerCase() : style.element;
					attrs = override.attributes;
				}

				// We can have more than one override definition for the same
				// element name, so we attempt to simply append information to
				// it if it already exists.
				overrideEl = overrides[ elementName ] || ( overrides[ elementName ] = {} );

				if ( attrs ) {
					// The returning attributes list is an array, because we
					// could have different override definitions for the same
					// attribute name.
					var overrideAttrs = ( overrideEl.attributes = overrideEl.attributes || [] );
					for ( var attName in attrs ) {
						// Each item in the attributes array is also an array,
						// where [0] is the attribute name and [1] is the
						// override value.
						overrideAttrs.push( [ attName.toLowerCase(), attrs[ attName ] ] );
					}
				}
			}
		}

		return overrides;
	}

	// Make the comparison of attribute value easier by standardizing it.
	function normalizeProperty( name, value, isStyle ) {
		var temp = new CKEDITOR.dom.element( 'span' );
		temp[ isStyle ? 'setStyle' : 'setAttribute' ]( name, value );
		return temp[ isStyle ? 'getStyle' : 'getAttribute' ]( name );
	}

	// Compare two bunch of styles, with the speciality that value 'inherit'
	// is treated as a wildcard which will match any value.
	// @param {Object/String} source
	// @param {Object/String} target
	// @returns {Boolean}
	function compareCssText( source, target ) {
		function filter( string, propertyName ) {
			// In case of font-families we'll skip quotes. (https://dev.ckeditor.com/ticket/10750)
			return propertyName.toLowerCase() == 'font-family' ? string.replace( /["']/g, '' ) : string;
		}

		if ( typeof source == 'string' )
			source = CKEDITOR.tools.parseCssText( source );
		if ( typeof target == 'string' )
			target = CKEDITOR.tools.parseCssText( target, true );

		for ( var name in source ) {
			if ( !( name in target ) ) {
				return false;
			}

			if ( !( filter( target[ name ], name ) == filter( source[ name ], name ) ||
				source[ name ] == 'inherit' ||
				target[ name ] == 'inherit' ) ) {
				return false;
			}
		}
		return true;
	}

	function applyStyleOnSelection( selection, remove, editor ) {
		var ranges = selection.getRanges(),
			func = remove ? this.removeFromRange : this.applyToRange,
			originalRanges,
			range,
			i;

		// In case of fake table selection, we would like to apply all styles and then select
		// the original ranges. Otherwise browsers would complain about discontiguous selection.
		if ( selection.isFake && selection.isInTable() ) {
			originalRanges = [];

			for ( i = 0; i < ranges.length; i++ ) {
				originalRanges.push( ranges[ i ].clone() );
			}
		}

		var iterator = ranges.createIterator();
		while ( ( range = iterator.getNextRange() ) )
			func.call( this, range, editor );

		selection.selectRanges( originalRanges || ranges );
	}
} )();

/**
 * Generic style command. It applies a specific style when executed.
 *
 *		var boldStyle = new CKEDITOR.style( { element: 'strong' } );
 *		// Register the "bold" command, which applies the bold style.
 *		editor.addCommand( 'bold', new CKEDITOR.styleCommand( boldStyle ) );
 *
 * @class
 * @constructor Creates a styleCommand class instance.
 * @extends CKEDITOR.commandDefinition
 * @param {CKEDITOR.style} style The style to be applied when command is executed.
 * @param {Object} [ext] Additional command definition's properties.
 */
CKEDITOR.styleCommand = function( style, ext ) {
	this.style = style;
	this.allowedContent = style;
	this.requiredContent = style;

	CKEDITOR.tools.extend( this, ext, true );
};

/**
 * @param {CKEDITOR.editor} editor
 * @todo
 */
CKEDITOR.styleCommand.prototype.exec = function( editor ) {
	editor.focus();

	if ( this.state == CKEDITOR.TRISTATE_OFF )
		editor.applyStyle( this.style );
	else if ( this.state == CKEDITOR.TRISTATE_ON )
		editor.removeStyle( this.style );
};

/**
 * Manages styles registration and loading. See also {@link CKEDITOR.config#stylesSet}.
 *
 *		// The set of styles for the <b>Styles</b> drop-down list.
 *		CKEDITOR.stylesSet.add( 'default', [
 *			// Block Styles
 *			{ name: 'Blue Title',		element: 'h3',		styles: { 'color': 'Blue' } },
 *			{ name: 'Red Title',		element: 'h3',		styles: { 'color': 'Red' } },
 *
 *			// Inline Styles
 *			{ name: 'Marker: Yellow',	element: 'span',	styles: { 'background-color': 'Yellow' } },
 *			{ name: 'Marker: Green',	element: 'span',	styles: { 'background-color': 'Lime' } },
 *
 *			// Object Styles
 *			{
 *				name: 'Image on Left',
 *				element: 'img',
 *				attributes: {
 *					style: 'padding: 5px; margin-right: 5px',
 *					border: '2',
 *					align: 'left'
 *				}
 *			}
 *		] );
 *
 * @since 3.2.0
 * @class
 * @singleton
 * @extends CKEDITOR.resourceManager
 */
CKEDITOR.stylesSet = new CKEDITOR.resourceManager( '', 'stylesSet' );

// Backward compatibility (https://dev.ckeditor.com/ticket/5025).
CKEDITOR.addStylesSet = CKEDITOR.tools.bind( CKEDITOR.stylesSet.add, CKEDITOR.stylesSet );
CKEDITOR.loadStylesSet = function( name, url, callback ) {
	CKEDITOR.stylesSet.addExternal( name, url, '' );
	CKEDITOR.stylesSet.load( name, callback );
};

CKEDITOR.tools.extend( CKEDITOR.editor.prototype, {
	/**
	 * Registers a function to be called whenever the selection position changes in the
	 * editing area. The current state is passed to the function. The possible
	 * states are {@link CKEDITOR#TRISTATE_ON} and {@link CKEDITOR#TRISTATE_OFF}.
	 *
	 *		// Create a style object for the <b> element.
	 *		var style = new CKEDITOR.style( { element: 'b' } );
	 *		var editor = CKEDITOR.instances.editor1;
	 *		editor.attachStyleStateChange( style, function( state ) {
	 *			if ( state == CKEDITOR.TRISTATE_ON )
	 *				alert( 'The current state for the B element is ON' );
	 *			else
	 *				alert( 'The current state for the B element is OFF' );
	 *		} );
	 *
	 * @member CKEDITOR.editor
	 * @param {CKEDITOR.style} style The style to be watched.
	 * @param {Function} callback The function to be called.
	 */
	attachStyleStateChange: function( style, callback ) {
		// Try to get the list of attached callbacks.
		var styleStateChangeCallbacks = this._.styleStateChangeCallbacks;

		// If it doesn't exist, it means this is the first call. So, let's create
		// all the structure to manage the style checks and the callback calls.
		if ( !styleStateChangeCallbacks ) {
			// Create the callbacks array.
			styleStateChangeCallbacks = this._.styleStateChangeCallbacks = [];

			// Attach to the selectionChange event, so we can check the styles at
			// that point.
			this.on( 'selectionChange', function( ev ) {
				// Loop throw all registered callbacks.
				for ( var i = 0; i < styleStateChangeCallbacks.length; i++ ) {
					var callback = styleStateChangeCallbacks[ i ];

					// Check the current state for the style defined for that callback.
					var currentState = callback.style.checkActive( ev.data.path, this ) ?
						CKEDITOR.TRISTATE_ON : CKEDITOR.TRISTATE_OFF;

					// Call the callback function, passing the current state to it.
					callback.fn.call( this, currentState );
				}
			} );
		}

		// Save the callback info, so it can be checked on the next occurrence of
		// selectionChange.
		styleStateChangeCallbacks.push( { style: style, fn: callback } );
	},

	/**
	 * Applies the style upon the editor's current selection. Shorthand for
	 * {@link CKEDITOR.style#apply}.
	 *
	 * @member CKEDITOR.editor
	 * @param {CKEDITOR.style} style
	 */
	applyStyle: function( style ) {
		style.apply( this );
	},

	/**
	 * Removes the style from the editor's current selection. Shorthand for
	 * {@link CKEDITOR.style#remove}.
	 *
	 * @member CKEDITOR.editor
	 * @param {CKEDITOR.style} style
	 */
	removeStyle: function( style ) {
		style.remove( this );
	},

	/**
	 * Gets the current `stylesSet` for this instance.
	 *
	 *		editor.getStylesSet( function( stylesDefinitions ) {} );
	 *
	 * See also {@link CKEDITOR.editor#stylesSet} event.
	 *
	 * @member CKEDITOR.editor
	 * @param {Function} callback The function to be called with the styles data.
	 */
	getStylesSet: function( callback ) {
		if ( !this._.stylesDefinitions ) {
			var editor = this,
				// Respect the backwards compatible definition entry
				configStyleSet = editor.config.stylesCombo_stylesSet || editor.config.stylesSet;

			// The false value means that none styles should be loaded.
			if ( configStyleSet === false ) {
				callback( null );
				return;
			}

			// https://dev.ckeditor.com/ticket/5352 Allow to define the styles directly in the config object
			if ( configStyleSet instanceof Array ) {
				editor._.stylesDefinitions = configStyleSet;
				callback( configStyleSet );
				return;
			}

			// Default value is 'default'.
			if ( !configStyleSet )
				configStyleSet = 'default';

			var partsStylesSet = configStyleSet.split( ':' ),
				styleSetName = partsStylesSet[ 0 ],
				externalPath = partsStylesSet[ 1 ];

			CKEDITOR.stylesSet.addExternal( styleSetName, externalPath ? partsStylesSet.slice( 1 ).join( ':' ) : CKEDITOR.getUrl( 'styles.js' ), '' );

			CKEDITOR.stylesSet.load( styleSetName, function( stylesSet ) {
				editor._.stylesDefinitions = stylesSet[ styleSetName ];
				callback( editor._.stylesDefinitions );
			} );
		} else {
			callback( this._.stylesDefinitions );
		}
	}
} );

/**
 * Indicates that fully selected read-only elements will be included when
 * applying the style (for inline styles only).
 *
 * @since 3.5.0
 * @property {Boolean} [includeReadonly=false]
 * @member CKEDITOR.style
 */

/**
 * Indicates that any matches element of this style will be eventually removed
 * when calling {@link CKEDITOR.editor#removeStyle}.
 *
 * @since 4.0.0
 * @property {Boolean} [alwaysRemoveElement=false]
 * @member CKEDITOR.style
 */

/**
 * Disables inline styling on read-only elements.
 *
 * @since 3.5.0
 * @cfg {Boolean} [disableReadonlyStyling=false]
 * @member CKEDITOR.config
 */

/**
 * The "styles definition set" to use in the editor. They will be used in the
 * styles combo and the style selector of the div container.
 *
 * The styles may be defined in the page containing the editor, or can be
 * loaded on demand from an external file. In the second case, if this setting
 * contains only a name, the `styles.js` file will be loaded from the
 * CKEditor root folder (what ensures backward compatibility with CKEditor 4.0).
 *
 * Otherwise, this setting has the `name:url` syntax, making it
 * possible to set the URL from which the styles file will be loaded.
 * Note that the `name` has to be equal to the name used in
 * {@link CKEDITOR.stylesSet#add} while registering the styles set.
 *
 * **Note**: Since 4.1.0 it is possible to set `stylesSet` to `false`
 * to prevent loading any styles set.
 *
 * Read more in the {@glink features/styles documentation}
 * and see the {@glink examples/styles example}.
 *
 *		// Do not load any file. The styles set is empty.
 *		config.stylesSet = false;
 *
 *		// Load the 'mystyles' styles set from the styles.js file.
 *		config.stylesSet = 'mystyles';
 *
 *		// Load the 'mystyles' styles set from a relative URL.
 *		config.stylesSet = 'mystyles:/editorstyles/styles.js';
 *
 *		// Load the 'mystyles' styles set from a full URL.
 *		config.stylesSet = 'mystyles:http://www.example.com/editorstyles/styles.js';
 *
 *		// Load from a list of definitions.
 *		config.stylesSet = [
 *			{ name: 'Strong Emphasis', element: 'strong' },
 *			{ name: 'Emphasis', element: 'em' },
 *			...
 *		];
 *
 * @since 3.3.0
 * @cfg {String/Array/Boolean} [stylesSet='default']
 * @member CKEDITOR.config
 */

/**
 * Abstract class describing the definition of a style.
 *
 * This virtual class illustrates the properties that developers can use to define and create
 * style definitions.
 *
 * A style definition object represents a style as a set of properties defining the element structure, its attributes and CSS styles.
 * The {@link CKEDITOR.style} based on such definition can be applied to and removed from the selection
 * through various {@link CKEDITOR.style} methods.
 *
 * ```javascript
 * {
 *		name: 'Special Title',
 *		element: 'h1',
 *		attributes: { class: 'my_class' },
 *		styles: { color: 'red', 'font-size': '16px', 'font-width': 'bold' }
 * }
 * ```
 *
 *	Refer to the {@glink guide/dev_howtos_styles Styles guide} for more information about how editor content styles are handled.
 *
 * @class CKEDITOR.style.definition
 * @abstract
 */

/**
 * Defines the style type.
 *
 * There are three standard style types:
 *
 * * {@link CKEDITOR#STYLE_INLINE},
 * * {@link CKEDITOR#STYLE_BLOCK},
 * * {@link CKEDITOR#STYLE_OBJECT}.
 *
 * Each type is related to the element used in the style rule and the types of elements to which a specific style can be applied.
 *
 * Plugins may define {@link CKEDITOR.style.customHandlers special style handlers} to customize style operations.
 * To use a special style handler, the `type` property should be set to the name of the style handler, e.g. `widget`.
 *
 * Refer to the {@glink features/styles#style-types Style Types section of the Applying Styles to Editor Content guide} for more information about style types.
 *
 * ```javascript
 * { type: CKEDITOR.STYLE_INLINE }
 * ```
 *
 * @property {String/Number} type=CKEDITOR.STYLE_INLINE
 */

/**
 * A unique style definition name. It can be used to differentiate style definitions, like in the {@glink features/styles Styles Combo} plugin
 * drop-down where it represents item labels.
 *
 * ```javascript
 * { name: 'Special title' }
 * ```
 *
 * @property {String} name
 */

/**
 * A set of properties specifying attributes of the HTML style element.
 * If the `style` attribute is present, it will be merged with the existing {@link CKEDITOR.style.definition#styles} property.
 *
 * ```javascript
 * {
 *		attributes: {
 *			style: 'color: red',
 *			class: 'link'
 *		}
 * }
 * ```
 *
 * @property {Object.<String, String>} attributes
 */

/**
 * An element type that will be applied to the selection when applying a style. It should be a valid HTML element, for example `span`.
 *
 * ```javascript
 * { element: 'h1' }
 * ```
 *
 * @property {String} element
 */

/**
 * A set of properties specifying CSS style rules of the HTML style element.
 *
 * ```javascript
 * {
 *		styles: {
 *			color: 'red',
 *			'font-size': '12px'
 *			'font-weight': 'bold'
 *		}
 * }
 * ```
 *
 * @property {Object.<String, String>} styles
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/* global Promise, ES6Promise */

( function() {
	'use strict';

	if ( window.Promise ) {
		CKEDITOR.tools.promise = Promise;
	} else {
		var polyfillURL = CKEDITOR.getUrl( 'vendor/promise.js' );

		CKEDITOR.scriptLoader.load( polyfillURL, function( success ) {
			if ( success ) {
				CKEDITOR.tools.promise = ES6Promise;
			} else {
				CKEDITOR.error( 'no-vendor-lib', {
					path: polyfillURL
				} );
			}
		} );
	}

	/**
	 * An alias for the [`Promise`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise)
	 * object representing an asynchronous operation.
	 *
	 * It uses the native `Promise` browser implementation if it is available. For older browsers with lack of `Promise` support,
	 * the [`ES6-Promise`](https://github.com/stefanpenner/es6-promise) polyfill is used.
	 * See the [Promise Browser Compatibility table](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise#Browser_compatibility)
	 * to learn more.
	 *
	 * Refer to [MDN Using Promises](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Using_promises) guide for
	 * more details on how to work with promises.
	 *
	 * **NOTE:** `catch` and `finally` are reserved keywords in IE<9 browsers. Use bracket notation instead:
	 *
	 * ```js
	 * promise[ 'catch' ]( function( err ) {
	 * 		// ...
	 * } );
	 *
	 * promise[ 'finally' ]( function() {
	 *		// ...
	 * } );
	 * ```
	 *
	 * @since 4.12.0
	 * @class CKEDITOR.tools.promise
	 */

	/**
	 * Creates a new `Promise` instance.
	 *
	 * ```js
	 *	new CKEDITOR.tools.promise( function( resolve, reject ) {
	 *		setTimeout( function() {
	 *			var timestamp;
	 *			try {
	 *				timestamp = ( new Date() ).getTime();
	 *			} catch ( e ) {
	 *				reject( e );
	 *			}
	 *			resolve( timestamp );
	 *		}, 5000 );
	 *	} );
	 * ```
	 *
	 * @param {Function} resolver
	 * @param {Function} resolver.resolve
	 * @param {Function} resolver.reject
	 * @constructor
	 */

} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Defines the {@link CKEDITOR.dom.comment} class, which represents
 *		a DOM comment node.
 */

/**
 * Represents a DOM comment node.
 *
 *		var nativeNode = document.createComment( 'Example' );
 *		var comment = new CKEDITOR.dom.comment( nativeNode );
 *
 *		var comment = new CKEDITOR.dom.comment( 'Example' );
 *
 * @class
 * @extends CKEDITOR.dom.node
 * @constructor Creates a comment class instance.
 * @param {Object/String} comment A native DOM comment node or a string containing
 * the text to use to create a new comment node.
 * @param {CKEDITOR.dom.document} [ownerDocument] The document that will contain
 * the node in case of new node creation. Defaults to the current document.
 */
CKEDITOR.dom.comment = function( comment, ownerDocument ) {
	if ( typeof comment == 'string' )
		comment = ( ownerDocument ? ownerDocument.$ : document ).createComment( comment );

	CKEDITOR.dom.domObject.call( this, comment );
};

CKEDITOR.dom.comment.prototype = new CKEDITOR.dom.node();

CKEDITOR.tools.extend( CKEDITOR.dom.comment.prototype, {
	/**
	 * The node type. This is a constant value set to {@link CKEDITOR#NODE_COMMENT}.
	 *
	 * @readonly
	 * @property {Number} [=CKEDITOR.NODE_COMMENT]
	 */
	type: CKEDITOR.NODE_COMMENT,

	/**
	 * Gets the outer HTML of this comment.
	 *
	 * @returns {String} The HTML `<!-- comment value -->`.
	 */
	getOuterHtml: function() {
		return '<!--' + this.$.nodeValue + '-->';
	}
} );

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

'use strict';

( function() {

	var pathBlockLimitElements = {},
		pathBlockElements = {},
		tag;

	// Elements that are considered the "Block limit" in an element path.
	for ( tag in CKEDITOR.dtd.$blockLimit ) {
		// Exclude from list roots.
		if ( !( tag in CKEDITOR.dtd.$list ) )
			pathBlockLimitElements[ tag ] = 1;
	}

	// Elements that are considered the "End level Block" in an element path.
	for ( tag in CKEDITOR.dtd.$block ) {
		// Exclude block limits, and empty block element, e.g. hr.
		if ( !( tag in CKEDITOR.dtd.$blockLimit || tag in CKEDITOR.dtd.$empty ) )
			pathBlockElements[ tag ] = 1;
	}

	// Check if an element contains any block element.
	function checkHasBlock( element ) {
		var childNodes = element.getChildren();

		for ( var i = 0, count = childNodes.count(); i < count; i++ ) {
			var child = childNodes.getItem( i );

			if ( child.type == CKEDITOR.NODE_ELEMENT && CKEDITOR.dtd.$block[ child.getName() ] )
				return true;
		}

		return false;
	}

	/**
	 * Retrieve the list of nodes walked from the start node up to the editable element of the editor.
	 *
	 * @class
	 * @constructor Creates an element path class instance.
	 * @param {CKEDITOR.dom.element} startNode From which the path should start.
	 * @param {CKEDITOR.dom.element} root To which element the path should stop, defaults to the `body` element.
	 */
	CKEDITOR.dom.elementPath = function( startNode, root ) {
		var block = null,
			blockLimit = null,
			elements = [],
			e = startNode,
			elementName;

		// Backward compact.
		root = root || startNode.getDocument().getBody();

		// Assign root value if startNode is null (#424)(https://dev.ckeditor.com/ticket/17028).
		if ( !e ) {
			e = root;
		}

		do {
			if ( e.type == CKEDITOR.NODE_ELEMENT ) {
				elements.push( e );

				if ( !this.lastElement ) {
					this.lastElement = e;

					// If an object or non-editable element is fully selected at the end of the element path,
					// it must not become the block limit.
					if ( e.is( CKEDITOR.dtd.$object ) || e.getAttribute( 'contenteditable' ) == 'false' )
						continue;
				}

				if ( e.equals( root ) )
					break;

				if ( !blockLimit ) {
					elementName = e.getName();

					// First editable element becomes a block limit, because it cannot be split.
					if ( e.getAttribute( 'contenteditable' ) == 'true' )
						blockLimit = e;
					// "Else" because element cannot be both - block and block levelimit.
					else if ( !block && pathBlockElements[ elementName ] )
						block = e;

					if ( pathBlockLimitElements[ elementName ] ) {
						// End level DIV is considered as the block, if no block is available. (https://dev.ckeditor.com/ticket/525)
						// But it must NOT be the root element (checked above).
						if ( !block && elementName == 'div' && !checkHasBlock( e ) )
							block = e;
						else
							blockLimit = e;
					}
				}
			}
		}
		while ( ( e = e.getParent() ) );

		// Block limit defaults to root.
		if ( !blockLimit )
			blockLimit = root;

		/**
		 * First non-empty block element which:
		 *
		 * * is not a {@link CKEDITOR.dtd#$blockLimit},
		 * * or is a `div` which does not contain block elements and is not a `root`.
		 *
		 * This means a first, splittable block in elements path.
		 *
		 * @readonly
		 * @property {CKEDITOR.dom.element}
		 */
		this.block = block;

		/**
		 * See the {@link CKEDITOR.dtd#$blockLimit} description.
		 *
		 * @readonly
		 * @property {CKEDITOR.dom.element}
		 */
		this.blockLimit = blockLimit;

		/**
		 * The root of the elements path - `root` argument passed to class constructor or a `body` element.
		 *
		 * @readonly
		 * @property {CKEDITOR.dom.element}
		 */
		this.root = root;

		/**
		 * An array of elements (from `startNode` to `root`) in the path.
		 *
		 * @readonly
		 * @property {CKEDITOR.dom.element[]}
		 */
		this.elements = elements;

		/**
		 * The last element of the elements path - `startNode` or its parent.
		 *
		 * @readonly
		 * @property {CKEDITOR.dom.element} lastElement
		 */
	};

} )();

CKEDITOR.dom.elementPath.prototype = {
	/**
	 * Compares this element path with another one.
	 *
	 * @param {CKEDITOR.dom.elementPath} otherPath The elementPath object to be
	 * compared with this one.
	 * @returns {Boolean} `true` if the paths are equal, containing the same
	 * number of elements and the same elements in the same order.
	 */
	compare: function( otherPath ) {
		var thisElements = this.elements;
		var otherElements = otherPath && otherPath.elements;

		if ( !otherElements || thisElements.length != otherElements.length )
			return false;

		for ( var i = 0; i < thisElements.length; i++ ) {
			if ( !thisElements[ i ].equals( otherElements[ i ] ) )
				return false;
		}

		return true;
	},

	/**
	 * Search the path elements that meets the specified criteria.
	 *
	 * @param {String/Array/Function/Object/CKEDITOR.dom.element} query The criteria that can be
	 * either a tag name, list (array and object) of tag names, element or an node evaluator function.
	 * @param {Boolean} [excludeRoot] Not taking path root element into consideration.
	 * @param {Boolean} [fromTop] Search start from the topmost element instead of bottom.
	 * @returns {CKEDITOR.dom.element} The first matched dom element or `null`.
	 */
	contains: function( query, excludeRoot, fromTop ) {
		var i = 0,
			evaluator;

		if ( typeof query == 'string' )
			evaluator = function( node ) {
				return node.getName() == query;
			};
		if ( query instanceof CKEDITOR.dom.element )
			evaluator = function( node ) {
				return node.equals( query );
			};
		else if ( CKEDITOR.tools.isArray( query ) )
			evaluator = function( node ) {
				return CKEDITOR.tools.indexOf( query, node.getName() ) > -1;
			};
		else if ( typeof query == 'function' )
			evaluator = query;
		else if ( typeof query == 'object' )
			evaluator = function( node ) {
				return node.getName() in query;
			};

		var elements = this.elements,
			length = elements.length;

		if ( excludeRoot ) {
			if ( !fromTop ) {
				length -= 1;
			} else {
				i += 1;
			}
		}

		if ( fromTop ) {
			elements = Array.prototype.slice.call( elements, 0 );
			elements.reverse();
		}

		for ( ; i < length; i++ ) {
			if ( evaluator( elements[ i ] ) )
				return elements[ i ];
		}

		return null;
	},

	/**
	 * Check whether the elements path is the proper context for the specified
	 * tag name in the DTD.
	 *
	 * @param {String} tag The tag name.
	 * @returns {Boolean}
	 */
	isContextFor: function( tag ) {
		var holder;

		// Check for block context.
		if ( tag in CKEDITOR.dtd.$block ) {
			// Indeterminate elements which are not subjected to be splitted or surrounded must be checked first.
			var inter = this.contains( CKEDITOR.dtd.$intermediate );
			holder = inter || ( this.root.equals( this.block ) && this.block ) || this.blockLimit;
			return !!holder.getDtd()[ tag ];
		}

		return true;
	},

	/**
	 * Retrieve the text direction for this elements path.
	 *
	 * @returns {'ltr'/'rtl'}
	 */
	direction: function() {
		var directionNode = this.block || this.blockLimit || this.root;
		return directionNode.getDirection( 1 );
	}
};

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Defines the {@link CKEDITOR.dom.text} class, which represents
 *		a DOM text node.
 */

/**
 * Represents a DOM text node.
 *
 *		var nativeNode = document.createTextNode( 'Example' );
 *		var text = new CKEDITOR.dom.text( nativeNode );
 *
 *		var text = new CKEDITOR.dom.text( 'Example' );
 *
 * @class
 * @extends CKEDITOR.dom.node
 * @constructor Creates a text class instance.
 * @param {Object/String} text A native DOM text node or a string containing
 * the text to use to create a new text node.
 * @param {CKEDITOR.dom.document} [ownerDocument] The document that will contain
 * the node in case of new node creation. Defaults to the current document.
 */
CKEDITOR.dom.text = function( text, ownerDocument ) {
	if ( typeof text == 'string' )
		text = ( ownerDocument ? ownerDocument.$ : document ).createTextNode( text );

	// Theoretically, we should call the base constructor here
	// (not CKEDITOR.dom.node though). But, IE doesn't support expando
	// properties on text node, so the features provided by domObject will not
	// work for text nodes (which is not a big issue for us).
	//
	// CKEDITOR.dom.domObject.call( this, element );

	this.$ = text;
};

CKEDITOR.dom.text.prototype = new CKEDITOR.dom.node();

CKEDITOR.tools.extend( CKEDITOR.dom.text.prototype, {
	/**
	 * The node type. This is a constant value set to {@link CKEDITOR#NODE_TEXT}.
	 *
	 * @readonly
	 * @property {Number} [=CKEDITOR.NODE_TEXT]
	 */
	type: CKEDITOR.NODE_TEXT,

	/**
	 * Gets length of node's value.
	 *
	 * @returns {Number}
	 */
	getLength: function() {
		return this.$.nodeValue.length;
	},

	/**
	 * Gets node's value.
	 *
	 * @returns {String}
	 */
	getText: function() {
		return this.$.nodeValue;
	},

	/**
	 * Sets node's value.
	 *
	 * @param {String} text
	 */
	setText: function( text ) {
		this.$.nodeValue = text;
	},

	/**
	 * Breaks this text node into two nodes at the specified offset,
	 * keeping both in the tree as siblings. This node then only contains
	 * all the content up to the offset point. A new text node, which is
	 * inserted as the next sibling of this node, contains all the content
	 * at and after the offset point. When the offset is equal to the
	 * length of this node, the new node has no data.
	 *
	 * @param {Number} The position at which to split, starting from zero.
	 * @returns {CKEDITOR.dom.text} The new text node.
	 */
	split: function( offset ) {

		// Saved the children count and text length beforehand.
		var parent = this.$.parentNode,
			count = parent.childNodes.length,
			length = this.getLength();

		var doc = this.getDocument();
		var retval = new CKEDITOR.dom.text( this.$.splitText( offset ), doc );

		if ( parent.childNodes.length == count ) {
			// If the offset is after the last char, IE creates the text node
			// on split, but don't include it into the DOM. So, we have to do
			// that manually here.
			if ( offset >= length ) {
				retval = doc.createText( '' );
				retval.insertAfter( this );
			} else {
				// IE BUG: IE8+ does not update the childNodes array in DOM after splitText(),
				// we need to make some DOM changes to make it update. (https://dev.ckeditor.com/ticket/3436)
				var workaround = doc.createText( '' );
				workaround.insertAfter( retval );
				workaround.remove();
			}
		}

		return retval;
	},

	/**
	 * Extracts characters from indexA up to but not including `indexB`.
	 *
	 * @param {Number} indexA An integer between `0` and one less than the
	 * length of the text.
	 * @param {Number} [indexB] An integer between `0` and the length of the
	 * string. If omitted, extracts characters to the end of the text.
	 */
	substring: function( indexA, indexB ) {
		// We need the following check due to a Firefox bug
		// https://bugzilla.mozilla.org/show_bug.cgi?id=458886
		if ( typeof indexB != 'number' )
			return this.$.nodeValue.substr( indexA );
		else
			return this.$.nodeValue.substring( indexA, indexB );
	}
} );

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

( function() {
	/**
	 * Represents a list os CKEDITOR.dom.range objects, which can be easily
	 * iterated sequentially.
	 *
	 * @class
	 * @extends Array
	 * @constructor Creates a rangeList class instance.
	 * @param {CKEDITOR.dom.range/CKEDITOR.dom.range[]} [ranges] The ranges contained on this list.
	 * Note that, if an array of ranges is specified, the range sequence
	 * should match its DOM order. This class will not help to sort them.
	 */
	CKEDITOR.dom.rangeList = function( ranges ) {
		if ( ranges instanceof CKEDITOR.dom.rangeList )
			return ranges;

		if ( !ranges )
			ranges = [];
		else if ( ranges instanceof CKEDITOR.dom.range )
			ranges = [ ranges ];

		return CKEDITOR.tools.extend( ranges, mixins );
	};

	var mixins = {
		/**
		 * Creates an instance of the rangeList iterator, it should be used
		 * only when the ranges processing could be DOM intrusive, which
		 * means it may pollute and break other ranges in this list.
		 * Otherwise, it's enough to just iterate over this array in a for loop.
		 *
		 * @returns {CKEDITOR.dom.rangeListIterator}
		 */
		createIterator: function() {
			var rangeList = this,
				bookmark = CKEDITOR.dom.walker.bookmark(),
				bookmarks = [],
				current;

			return {
				/**
				 * Retrieves the next range in the list.
				 *
				 * @member CKEDITOR.dom.rangeListIterator
				 * @param {Boolean} [mergeConsequent=false] Whether join two adjacent
				 * ranges into single, e.g. consequent table cells.
				 */
				getNextRange: function( mergeConsequent ) {
					current = current === undefined ? 0 : current + 1;

					var range = rangeList[ current ];

					// Multiple ranges might be mangled by each other.
					if ( range && rangeList.length > 1 ) {
						// Bookmarking all other ranges on the first iteration,
						// the range correctness after it doesn't matter since we'll
						// restore them before the next iteration.
						if ( !current ) {
							// Make sure bookmark correctness by reverse processing.
							for ( var i = rangeList.length - 1; i >= 0; i-- )
								bookmarks.unshift( rangeList[ i ].createBookmark( true ) );
						}

						if ( mergeConsequent ) {
							// Figure out how many ranges should be merged.
							var mergeCount = 0;
							while ( rangeList[ current + mergeCount + 1 ] ) {
								var doc = range.document,
									found = 0,
									left = doc.getById( bookmarks[ mergeCount ].endNode ),
									right = doc.getById( bookmarks[ mergeCount + 1 ].startNode ),
									next;

								// Check subsequent range.
								while ( 1 ) {
									next = left.getNextSourceNode( false );
									if ( !right.equals( next ) ) {
										// This could be yet another bookmark or
										// walking across block boundaries.
										if ( bookmark( next ) || ( next.type == CKEDITOR.NODE_ELEMENT && next.isBlockBoundary() ) ) {
											left = next;
											continue;
										}
									} else {
										found = 1;
									}

									break;
								}

								if ( !found )
									break;

								mergeCount++;
							}
						}

						range.moveToBookmark( bookmarks.shift() );

						// Merge ranges finally after moving to bookmarks.
						while ( mergeCount-- ) {
							next = rangeList[ ++current ];
							next.moveToBookmark( bookmarks.shift() );
							range.setEnd( next.endContainer, next.endOffset );
						}
					}

					return range;
				}
			};
		},

		/**
		 * Create bookmarks for all ranges. See {@link CKEDITOR.dom.range#createBookmark}.
		 *
		 * @param {Boolean} [serializable=false] See {@link CKEDITOR.dom.range#createBookmark}.
		 * @returns {Array} Array of bookmarks.
		 */
		createBookmarks: function( serializable ) {
			var retval = [],
				bookmark;
			for ( var i = 0; i < this.length; i++ ) {
				retval.push( bookmark = this[ i ].createBookmark( serializable, true ) );

				// Updating the container & offset values for ranges
				// that have been touched.
				for ( var j = i + 1; j < this.length; j++ ) {
					this[ j ] = updateDirtyRange( bookmark, this[ j ] );
					this[ j ] = updateDirtyRange( bookmark, this[ j ], true );
				}
			}
			return retval;
		},

		/**
		 * Create "unobtrusive" bookmarks for all ranges. See {@link CKEDITOR.dom.range#createBookmark2}.
		 *
		 * @param {Boolean} [normalized=false] See {@link CKEDITOR.dom.range#createBookmark2}.
		 * @returns {Array} Array of bookmarks.
		 */
		createBookmarks2: function( normalized ) {
			var bookmarks = [];

			for ( var i = 0; i < this.length; i++ )
				bookmarks.push( this[ i ].createBookmark2( normalized ) );

			return bookmarks;
		},

		/**
		 * Move each range in the list to the position specified by a list of bookmarks.
		 *
		 * @param {Array} bookmarks The list of bookmarks, each one matching a range in the list.
		 */
		moveToBookmarks: function( bookmarks ) {
			for ( var i = 0; i < this.length; i++ )
				this[ i ].moveToBookmark( bookmarks[ i ] );
		}
	};

	// Update the specified range which has been mangled by previous insertion of
	// range bookmark nodes.(https://dev.ckeditor.com/ticket/3256)
	function updateDirtyRange( bookmark, dirtyRange, checkEnd ) {
		var serializable = bookmark.serializable,
			container = dirtyRange[ checkEnd ? 'endContainer' : 'startContainer' ],
			offset = checkEnd ? 'endOffset' : 'startOffset';

		var bookmarkStart = serializable ? dirtyRange.document.getById( bookmark.startNode ) : bookmark.startNode;

		var bookmarkEnd = serializable ? dirtyRange.document.getById( bookmark.endNode ) : bookmark.endNode;

		if ( container.equals( bookmarkStart.getPrevious() ) ) {
			dirtyRange.startOffset = dirtyRange.startOffset - container.getLength() - bookmarkEnd.getPrevious().getLength();
			container = bookmarkEnd.getNext();
		} else if ( container.equals( bookmarkEnd.getPrevious() ) ) {
			dirtyRange.startOffset = dirtyRange.startOffset - container.getLength();
			container = bookmarkEnd.getNext();
		}

		container.equals( bookmarkStart.getParent() ) && dirtyRange[ offset ]++;
		container.equals( bookmarkEnd.getParent() ) && dirtyRange[ offset ]++;

		// Update and return this range.
		dirtyRange[ checkEnd ? 'endContainer' : 'startContainer' ] = container;
		return dirtyRange;
	}
} )();

/**
 * (Virtual Class) Do not call this constructor. This class is not really part
 * of the API. It just describes the return type of {@link CKEDITOR.dom.rangeList#createIterator}.
 *
 * @class CKEDITOR.dom.rangeListIterator
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Defines the {@link CKEDITOR.skin} class that is used to manage skin parts.
 */

( function() {
	var cssLoaded = {};

	function getName() {
		return CKEDITOR.skinName.split( ',' )[ 0 ];
	}

	function getConfigPath() {
		return CKEDITOR.getUrl( CKEDITOR.skinName.split( ',' )[ 1 ] || ( 'skins/' + getName() + '/' ) );
	}

	/**
	 * Manages the loading of skin parts among all editor instances.
	 *
	 * @class
	 * @singleton
	 */
	CKEDITOR.skin = {
		/**
		 * Returns the root path to the skin directory.
		 *
		 * @method
		 * @todo
		 */
		path: getConfigPath,

		/**
		 * Loads a skin part into the page. Does nothing if the part has already been loaded.
		 *
		 * **Note:** The "editor" part is always auto loaded upon instance creation,
		 * thus this function is mainly used to **lazy load** other parts of the skin
		 * that do not have to be displayed until requested.
		 *
		 *		// Load the dialog part.
		 *		editor.skin.loadPart( 'dialog' );
		 *
		 * @param {String} part The name of the skin part CSS file that resides in the skin directory.
		 * @param {Function} fn The provided callback function which is invoked after the part is loaded.
		 */
		loadPart: function( part, fn ) {
			if ( CKEDITOR.skin.name != getName() ) {
				CKEDITOR.scriptLoader.load( CKEDITOR.getUrl( getConfigPath() + 'skin.js' ), function() {
					loadCss( part, fn );
				} );
			} else {
				loadCss( part, fn );
			}
		},

		/**
		 * Retrieves the real URL of a (CSS) skin part.
		 *
		 * @param {String} part
		 */
		getPath: function( part ) {
			return CKEDITOR.getUrl( getCssPath( part ) );
		},

		/**
		 * The list of registered icons. To add new icons to this list, use {@link #addIcon}.
		 */
		icons: {},

		/**
		 * Registers an icon.
		 *
		 * @param {String} name The icon name.
		 * @param {String} path The path to the icon image file.
		 * @param {Number} [offset] The vertical offset position of the icon, if
		 * available inside a strip image.
		 * @param {String} [bgsize] The value of the CSS "background-size" property to
		 * use for this icon
		 */
		addIcon: function( name, path, offset, bgsize ) {
			name = name.toLowerCase();
			if ( !this.icons[ name ] ) {
				this.icons[ name ] = {
					path: path,
					offset: offset || 0,
					bgsize: bgsize || '16px'
				};
			}
		},

		/**
		 * Gets the CSS background styles to be used to render a specific icon.
		 *
		 * @param {String} name The icon name, as registered with {@link #addIcon}.
		 * @param {Boolean} [rtl] Indicates that the RTL version of the icon is
		 * to be used, if available.
		 * @param {String} [overridePath] The path to the icon image file. It
		 * overrides the path defined by the named icon, if available, and is
		 * used if the named icon was not registered.
		 * @param {Number} [overrideOffset] The vertical offset position of the
		 * icon. It overrides the offset defined by the named icon, if
		 * available, and is used if the named icon was not registered.
		 * @param {String} [overrideBgsize] The value of the CSS "background-size" property
		 * to use for the icon. It overrides the value defined by the named icon,
		 * if available, and is used if the named icon was not registered.
		 */
		getIconStyle: function( name, rtl, overridePath, overrideOffset, overrideBgsize ) {
			var icon, path, offset, bgsize;

			if ( name ) {
				name = name.toLowerCase();
				// If we're in RTL, try to get the RTL version of the icon.
				if ( rtl )
					icon = this.icons[ name + '-rtl' ];

				// If not in LTR or no RTL version available, get the generic one.
				if ( !icon )
					icon = this.icons[ name ];
			}

			path = overridePath || ( icon && icon.path ) || '';
			offset = overrideOffset || ( icon && icon.offset );
			bgsize = overrideBgsize || ( icon && icon.bgsize ) || '16px';

			// If we use apostrophes in background-image, we must escape apostrophes in path (just to be sure). (https://dev.ckeditor.com/ticket/13361)
			if ( path )
				path = path.replace( /'/g, '\\\'' );

			return path &&
				( 'background-image:url(\'' + CKEDITOR.getUrl( path ) + '\');background-position:0 ' + offset + 'px;background-size:' + bgsize + ';' );
		}
	};

	function getCssPath( part ) {
		// Check for ua-specific version of skin part.
		var uas = CKEDITOR.skin[ 'ua_' + part ], env = CKEDITOR.env;
		if ( uas ) {

			// Having versioned UA checked first.
			uas = uas.split( ',' ).sort( function( a, b ) {
				return a > b ? -1 : 1;
			} );

			// Loop through all ua entries, checking is any of them match the current ua.
			for ( var i = 0, ua; i < uas.length; i++ ) {
				ua = uas[ i ];

				if ( env.ie ) {
					if ( ( ua.replace( /^ie/, '' ) == env.version ) || ( env.quirks && ua == 'iequirks' ) )
						ua = 'ie';
				}

				if ( env[ ua ] ) {
					part += '_' + uas[ i ];
					break;
				}
			}
		}
		return CKEDITOR.getUrl( getConfigPath() + part + '.css' );
	}

	function loadCss( part, callback ) {
		// Avoid reload.
		if ( !cssLoaded[ part ] ) {
			CKEDITOR.document.appendStyleSheet( getCssPath( part ) );
			cssLoaded[ part ] = 1;
		}

		// CSS loading should not be blocking.
		callback && callback();
	}

	CKEDITOR.tools.extend( CKEDITOR.editor.prototype, {
		/** Gets the color of the editor user interface.
		 *
		 *		CKEDITOR.instances.editor1.getUiColor();
		 *
		 * @method
		 * @member CKEDITOR.editor
		 * @returns {String} uiColor The editor UI color or `undefined` if the UI color is not set.
		 */
		getUiColor: function() {
			return this.uiColor;
		},

		/** Sets the color of the editor user interface. This method accepts a color value in
		 * hexadecimal notation, with a `#` character (e.g. #ffffff).
		 *
		 * 		CKEDITOR.instances.editor1.setUiColor( '#ff00ff' );
		 *
		 * @method
		 * @member CKEDITOR.editor
		 * @param {String} color The desired editor UI color in hexadecimal notation.
		 */
		setUiColor: function( color ) {
			var uiStyle = getStylesheet( CKEDITOR.document );

			return ( this.setUiColor = function( color ) {
				this.uiColor = color;

				var chameleon = CKEDITOR.skin.chameleon,
					editorStyleContent = '',
					panelStyleContent = '';

				if ( typeof chameleon == 'function' ) {
					editorStyleContent = chameleon( this, 'editor' );
					panelStyleContent = chameleon( this, 'panel' );
				}

				var replace = [ [ uiColorRegexp, color ] ];

				// Update general style.
				updateStylesheets( [ uiStyle ], editorStyleContent, replace );

				// Update panel styles.
				updateStylesheets( uiColorMenus, panelStyleContent, replace );
			} ).call( this, color );
		}
	} );

	var uiColorStylesheetId = 'cke_ui_color',
		uiColorMenus = [],
		uiColorRegexp = /\$color/g;

	function getStylesheet( document ) {
		var node = document.getById( uiColorStylesheetId );
		if ( !node ) {
			node = document.getHead().append( 'style' );
			node.setAttribute( 'id', uiColorStylesheetId );
			node.setAttribute( 'type', 'text/css' );
		}
		return node;
	}

	function updateStylesheets( styleNodes, styleContent, replace ) {
		var r, i, content;

		// We have to split CSS declarations for webkit.
		if ( CKEDITOR.env.webkit ) {
			styleContent = styleContent.split( '}' ).slice( 0, -1 );
			for ( i = 0; i < styleContent.length; i++ )
				styleContent[ i ] = styleContent[ i ].split( '{' );
		}

		for ( var id = 0; id < styleNodes.length; id++ ) {
			if ( CKEDITOR.env.webkit ) {
				for ( i = 0; i < styleContent.length; i++ ) {
					content = styleContent[ i ][ 1 ];
					for ( r = 0; r < replace.length; r++ )
						content = content.replace( replace[ r ][ 0 ], replace[ r ][ 1 ] );

					styleNodes[ id ].$.sheet.addRule( styleContent[ i ][ 0 ], content );
				}
			} else {
				content = styleContent;
				for ( r = 0; r < replace.length; r++ )
					content = content.replace( replace[ r ][ 0 ], replace[ r ][ 1 ] );

				if ( CKEDITOR.env.ie && CKEDITOR.env.version < 11 )
					styleNodes[ id ].$.styleSheet.cssText += content;
				else
					styleNodes[ id ].$.innerHTML += content;
			}
		}
	}

	CKEDITOR.on( 'instanceLoaded', function( evt ) {
		// The chameleon feature is not for IE quirks.
		if ( CKEDITOR.env.ie && CKEDITOR.env.quirks ) {
			return;
		}

		var editor = evt.editor,
			showCallback = function( event ) {
				var panel = event.data[ 0 ] || event.data,
					iframe = panel.element.getElementsByTag( 'iframe' ).getItem( 0 ).getFrameDocument();

				// Add the stylesheet if missing.
				if ( !iframe.getById( 'cke_ui_color' ) ) {
					var node = getStylesheet( iframe );
					uiColorMenus.push( node );

					// Cleanup after destroying the editor (#589).
					editor.on( 'destroy', function() {
						uiColorMenus = CKEDITOR.tools.array.filter( uiColorMenus, function( storedNode ) {
							return node !== storedNode;
						} );
					} );

					var color = editor.getUiColor();
					// Set uiColor for the new panel.
					if ( color ) {
						updateStylesheets( [ node ], CKEDITOR.skin.chameleon( editor, 'panel' ), [ [ uiColorRegexp, color ] ] );
					}
				}
			};

		editor.on( 'panelShow', showCallback );
		editor.on( 'menuShow', showCallback );

		// Apply UI color if specified in config.
		if ( editor.config.uiColor )
			editor.setUiColor( editor.config.uiColor );
	} );
} )();

/**
 * The list of file names matching the browser user agent string from
 * {@link CKEDITOR.env}. This is used to load the skin part file in addition
 * to the "main" skin file for a particular browser.
 *
 * **Note:** For each of the defined skin parts the corresponding
 * CSS file with the same name as the user agent must exist inside
 * the skin directory.
 *
 * @property ua
 * @todo type?
 */

/**
 * The name of the skin that is currently used.
 *
 * @property {String} name
 * @todo
 */

/**
 * The editor skin name. Note that it is not possible to have editors with
 * different skin settings in the same page. In such case just one of the
 * skins will be used for all editors.
 *
 * This is a shortcut to {@link CKEDITOR#skinName}.
 *
 * It is possible to install skins outside the default `skin` folder in the
 * editor installation. In that case, the absolute URL path to that folder
 * should be provided, separated by a comma (`'skin_name,skin_path'`).
 *
 *		config.skin = 'moono';
 *
 *		config.skin = 'myskin,/customstuff/myskin/';
 *
 * @cfg {String} skin
 * @member CKEDITOR.config
 */

/**
 * A function that supports the chameleon (skin color switch) feature, providing
 * the skin color style updates to be applied in runtime.
 *
 * **Note:** The embedded `$color` variable is to be substituted with a specific UI color.
 *
 * @method chameleon
 * @param {String} editor The editor instance that the color changes apply to.
 * @param {String} part The name of the skin part where the color changes take place.
 */

/**
 * To help implement browser-specific "hacks" to the skin files and make it easy to maintain,
 * it is possible to have dedicated files for such browsers. The browser files must be named after the main file names,
 * appended by an underscore and the browser name (e.g. `editor_ie.css`, `editor_ie8.css`). The accepted browser names
 * must match the {@link CKEDITOR.env} properties. You can find more information about browser "hacks" in the
 * {@glink guide/skin_sdk_browser_hacks Dedicated Browser Hacks} guide.
 *
 *		CKEDITOR.skin.ua_editor = 'ie,iequirks,ie8,gecko';
 *
 * @property {String} ua_editor
 */

/**
 * Similar to {@link #ua_editor} but used for dialog stylesheets.
 *
 *		CKEDITOR.skin.ua_dialog = 'ie,iequirks,ie8,gecko';
 *
 * @property {String} ua_dialog
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview API initialization code.
 */

( function() {
	// Disable HC detection in WebKit. (https://dev.ckeditor.com/ticket/5429)
	if ( CKEDITOR.env.webkit )
		CKEDITOR.env.hc = false;
	else {
		// Check whether high contrast is active by creating a colored border.
		var hcDetect = CKEDITOR.dom.element.createFromHtml( '<div style="width:0;height:0;position:absolute;left:-10000px;' +
			'border:1px solid;border-color:red blue"></div>', CKEDITOR.document );

		hcDetect.appendTo( CKEDITOR.document.getHead() );

		// Update CKEDITOR.env.
		// Catch exception needed sometimes for FF. (https://dev.ckeditor.com/ticket/4230)
		try {
			var top = hcDetect.getComputedStyle( 'border-top-color' ),
				right = hcDetect.getComputedStyle( 'border-right-color' );

			// We need to check if getComputedStyle returned any value, because on FF
			// it returnes empty string if CKEditor is loaded in hidden iframe. (https://dev.ckeditor.com/ticket/11121)
			CKEDITOR.env.hc = !!( top && top == right );
		} catch ( e ) {
			CKEDITOR.env.hc = false;
		}

		hcDetect.remove();
	}

	if ( CKEDITOR.env.hc )
		CKEDITOR.env.cssClass += ' cke_hc';

	// Initially hide UI spaces when relevant skins are loading, later restored by skin css.
	CKEDITOR.document.appendStyleText( '.cke{visibility:hidden;}' );

	// Mark the editor as fully loaded.
	CKEDITOR.status = 'loaded';
	CKEDITOR.fireOnce( 'loaded' );

	// Process all instances created by the "basic" implementation.
	var pending = CKEDITOR._.pending;
	if ( pending ) {
		delete CKEDITOR._.pending;

		for ( var i = 0; i < pending.length; i++ ) {
			CKEDITOR.editor.prototype.constructor.apply( pending[ i ][ 0 ], pending[ i ][ 1 ] );
			CKEDITOR.add( pending[ i ][ 0 ] );
		}
	}
} )();

/**
 * Indicates that CKEditor is running on a High Contrast environment.
 *
 *		if ( CKEDITOR.env.hc )
 *			alert( 'You\'re running on High Contrast mode. The editor interface will get adapted to provide you a better experience.' );
 *
 * @property {Boolean} hc
 * @member CKEDITOR.env
 */

/**
 * Fired when a CKEDITOR core object is fully loaded and ready for interaction.
 *
 * @event loaded
 * @member CKEDITOR
 */
/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/*
skin.js
=========

In this file we interact with the CKEditor JavaScript API to register the skin
and enable additional skin related features.

The level of complexity of this file depends on the features available in the
skin. There is only one mandatory line of code to be included here, which is
setting CKEDITOR.skin.name. All the rest is optional, but recommended to be
implemented as they make higher quality skins.

For this skin, the following tasks are achieved in this file:

	1. Register the skin.
	2. Register browser specific skin files.
	3. Define the "Chameleon" feature.
	4. Register the skin icons, to have them used on the development version of
		the skin.
*/

// 1. Register the skin
// ----------------------
// The CKEDITOR.skin.name property must be set to the skin name. This is a
// lower-cased name, which must match the skin folder name as well as the value
// used on config.skin to tell the editor to use the skin.
//
// This is the only mandatory property to be defined in this file.
CKEDITOR.skin.name = 'moono';

// 2. Register browser specific skin files
// -----------------------------------------
// (https://ckeditor.com/docs/ckeditor4/latest/guide/skin_sdk_browser_hacks.html)
//
// To help implementing browser specific "hacks" to the skin files and have it
// easy to maintain, it is possible to have dedicated files for such browsers,
// for both the main skin CSS files: editor.css and dialog.css.
//
// The browser files must be named after the main file names, appended by an
// underscore and the browser name (e.g. editor_ie.css, dialog_ie8.css).
//
// The accepted browser names must match the CKEDITOR.env properties. The most
// common names are: ie, webkit and gecko. Check the documentation for the complete
// list:
// https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_env.html
//
// Internet explorer is an expection and the browser version is also accepted
// (ie7, ie8, ie9, ie10), as well as a special name for IE in Quirks mode (iequirks).
//
// The available browser specific files must be set separately for editor.css
// and dialog.css.
CKEDITOR.skin.ua_editor = 'ie,iequirks,ie7,ie8,gecko';
CKEDITOR.skin.ua_dialog = 'ie,iequirks,ie7,ie8';

// 3. Define the "Chameleon" feature
// -----------------------------------
// (https://ckeditor.com/docs/ckeditor4/latest/guide/skin_sdk_chameleon.html)
//
// "Chameleon" is a unique feature available in CKEditor. It makes it possible
// to end users to specify which color to use as the basis for the editor UI.
// It is enough to set config.uiColor to any color value and voila, the UI is
// colored.
//
// The only detail here is that the skin itself must be compatible with the
// Chameleon feature. That's because the skin CSS files are the responsible to
// apply colors in the UI and each skin do that in different way and on
// different places.
//
// Implementing the Chameleon feature requires a bit of JavaScript programming.
// The CKEDITOR.skin.chameleon function must be defined. It must return the CSS
// "template" to be used to change the color of a specific CKEditor instance
// available in the page. When a color change is required, this template is
// appended to the page holding the editor, overriding styles defined in the
// skin files.
//
// The "$color" placeholder can be used in the returned string. It'll be
// replaced with the desired color.
CKEDITOR.skin.chameleon = ( function() {
	// This method can be used to adjust colour brightness of various element.
	// Colours are accepted in 7-byte hex format, for example: #00ff00.
	// Brightness ratio must be a float number within [-1, 1],
	// where -1 is black, 1 is white and 0 is the original colour.
	var colorBrightness = ( function() {
		function channelBrightness( channel, ratio ) {
			var brighten = ratio < 0 ? (
					0 | channel * ( 1 + ratio )
				) : (
					0 | channel + ( 255 - channel ) * ratio
				);

			return ( '0' + brighten.toString( 16 ) ).slice( -2 );
		}

		return function( hexColor, ratio ) {
			var channels = hexColor.match( /[^#]./g );

			for ( var i = 0 ; i < 3 ; i++ )
				channels[ i ] = channelBrightness( parseInt( channels[ i ], 16 ), ratio );

			return '#' + channels.join( '' );
		};
	} )(),

	// Use this function just to avoid having to repeat all these rules on
	// several places of our template.
	verticalGradient = ( function() {
		var template = new CKEDITOR.template( 'background:#{to};' +
			'background-image:linear-gradient(to bottom,{from},{to});' +
			'filter:progid:DXImageTransform.Microsoft.gradient(gradientType=0,startColorstr=\'{from}\',endColorstr=\'{to}\');' );

		return function( from, to ) {
			return template.output( { from: from, to: to } );
		};
	} )(),

	// Style templates for various user interface parts:
	// 	* Default editor template.
	// 	* Default panel template.
	templates = {
		editor: new CKEDITOR.template(
			'{id}.cke_chrome [border-color:{defaultBorder};] ' +
			'{id} .cke_top [ ' +
					'{defaultGradient}' +
					'border-bottom-color:{defaultBorder};' +
				'] ' +
			'{id} .cke_bottom [' +
					'{defaultGradient}' +
					'border-top-color:{defaultBorder};' +
				'] ' +
			'{id} .cke_resizer [border-right-color:{ckeResizer}] ' +

			// Dialogs.
			'{id} .cke_dialog_title [' +
					'{defaultGradient}' +
					'border-bottom-color:{defaultBorder};' +
				'] ' +
			'{id} .cke_dialog_footer [' +
					'{defaultGradient}' +
					'outline-color:{defaultBorder};' +
					'border-top-color:{defaultBorder};' +	// IE7 doesn't use outline.
				'] ' +
			'{id} .cke_dialog_tab [' +
					'{lightGradient}' +
					'border-color:{defaultBorder};' +
				'] ' +
			'{id} .cke_dialog_tab:hover [' +
					'{mediumGradient}' +
				'] ' +
			'{id} .cke_dialog_contents [' +
					'border-top-color:{defaultBorder};' +
				'] ' +
			'{id} .cke_dialog_tab_selected, {id} .cke_dialog_tab_selected:hover [' +
					'background:{dialogTabSelected};' +
					'border-bottom-color:{dialogTabSelectedBorder};' +
				'] ' +
			'{id} .cke_dialog_body [' +
					'background:{dialogBody};' +
					'border-color:{defaultBorder};' +
				'] ' +

			// Toolbars, buttons.
			'{id} .cke_toolgroup [' +
					'{lightGradient}' +
					'border-color:{defaultBorder};' +
				'] ' +
			'{id} a.cke_button_off:hover, {id} a.cke_button_off:focus, {id} a.cke_button_off:active [' +
					'{mediumGradient}' +
				'] ' +
			'{id} .cke_button_on [' +
					'{ckeButtonOn}' +
				'] ' +
			'{id} .cke_toolbar_separator [' +
					'background-color: {ckeToolbarSeparator};' +
				'] ' +

			// Combo buttons.
			'{id} .cke_combo_button [' +
					'border-color:{defaultBorder};' +
					'{lightGradient}' +
				'] ' +
			'{id} a.cke_combo_button:hover, {id} a.cke_combo_button:focus, {id} .cke_combo_on a.cke_combo_button [' +
					'border-color:{defaultBorder};' +
					'{mediumGradient}' +
				'] ' +

			// Elementspath.
			'{id} .cke_path_item [' +
					'color:{elementsPathColor};' +
				'] ' +
			'{id} a.cke_path_item:hover, {id} a.cke_path_item:focus, {id} a.cke_path_item:active [' +
					'background-color:{elementsPathBg};' +
				'] ' +

			'{id}.cke_panel [' +
				'border-color:{defaultBorder};' +
			'] '
		),
		panel: new CKEDITOR.template(
			// Panel drop-downs.
			'.cke_panel_grouptitle [' +
					'{lightGradient}' +
					'border-color:{defaultBorder};' +
				'] ' +

			// Context menus.
			'.cke_menubutton_icon [' +
					'background-color:{menubuttonIcon};' +
				'] ' +
			'.cke_menubutton:hover .cke_menubutton_icon, .cke_menubutton:focus .cke_menubutton_icon, .cke_menubutton:active .cke_menubutton_icon [' +
					'background-color:{menubuttonIconHover};' +
				'] ' +
			'.cke_menuseparator [' +
					'background-color:{menubuttonIcon};' +
				'] ' +

			// Color boxes.
			'a:hover.cke_colorbox, a:focus.cke_colorbox, a:active.cke_colorbox [' +
					'border-color:{defaultBorder};' +
				'] ' +
			'a:hover.cke_colorauto, a:hover.cke_colormore, a:focus.cke_colorauto, a:focus.cke_colormore, a:active.cke_colorauto, a:active.cke_colormore [' +
					'background-color:{ckeColorauto};' +
					'border-color:{defaultBorder};' +
				'] '
		)
	};

	return function( editor, part ) {
		var uiColor = editor.uiColor,
			// The following are CSS styles used in templates.
			// Styles are generated according to current editor.uiColor.
			templateStyles = {
				// CKEditor instances have a unique ID, which is used as class name into
				// the outer container of the editor UI (e.g. ".cke_1").
				//
				// The Chameleon feature is available for each CKEditor instance,
				// independently. Because of this, we need to prefix all CSS selectors with
				// the unique class name of the instance.
				id: '.' + editor.id,

				// These styles are used by various UI elements.
				defaultBorder: colorBrightness( uiColor, -0.1 ),
				defaultGradient: verticalGradient( colorBrightness( uiColor, 0.9 ), uiColor ),
				lightGradient: verticalGradient( colorBrightness( uiColor, 1 ), colorBrightness( uiColor, 0.7 ) ),
				mediumGradient: verticalGradient( colorBrightness( uiColor, 0.8 ), colorBrightness( uiColor, 0.5 ) ),

				// These are for specific UI elements.
				ckeButtonOn: verticalGradient( colorBrightness( uiColor, 0.6 ), colorBrightness( uiColor, 0.7 ) ),
				ckeResizer: colorBrightness( uiColor, -0.4 ),
				ckeToolbarSeparator: colorBrightness( uiColor, 0.5 ),
				ckeColorauto: colorBrightness( uiColor, 0.8 ),
				dialogBody: colorBrightness( uiColor, 0.7 ),
				// Use gradient instead of simple hex to avoid further filter resetting in IE.
				dialogTabSelected: verticalGradient( '#FFFFFF', '#FFFFFF' ),
				dialogTabSelectedBorder: '#FFF',
				elementsPathColor: colorBrightness( uiColor, -0.6 ),
				elementsPathBg: uiColor,
				menubuttonIcon: colorBrightness( uiColor, 0.5 ),
				menubuttonIconHover: colorBrightness( uiColor, 0.3 )
			};

		return templates[ part ]
			.output( templateStyles )
			.replace( /\[/g, '{' )				// Replace brackets with braces.
			.replace( /\]/g, '}' );
	};
} )();


/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview The Dialog User Interface plugin.
 */

CKEDITOR.plugins.add( 'dialogui', {
	onLoad: function() {

		var initPrivateObject = function( elementDefinition ) {
				this._ || ( this._ = {} );
				this._[ 'default' ] = this._.initValue = elementDefinition[ 'default' ] || '';
				this._.required = elementDefinition.required || false;
				var args = [ this._ ];
				for ( var i = 1; i < arguments.length; i++ )
					args.push( arguments[ i ] );
				args.push( true );
				CKEDITOR.tools.extend.apply( CKEDITOR.tools, args );
				return this._;
			},
			textBuilder = {
				build: function( dialog, elementDefinition, output ) {
					return new CKEDITOR.ui.dialog.textInput( dialog, elementDefinition, output );
				}
			},
			commonBuilder = {
				build: function( dialog, elementDefinition, output ) {
					return new CKEDITOR.ui.dialog[ elementDefinition.type ]( dialog, elementDefinition, output );
				}
			},
			containerBuilder = {
				build: function( dialog, elementDefinition, output ) {
					var children = elementDefinition.children,
						child,
						childHtmlList = [],
						childObjList = [];
					for ( var i = 0;
					( i < children.length && ( child = children[ i ] ) ); i++ ) {
						var childHtml = [];
						childHtmlList.push( childHtml );
						childObjList.push( CKEDITOR.dialog._.uiElementBuilders[ child.type ].build( dialog, child, childHtml ) );
					}
					return new CKEDITOR.ui.dialog[ elementDefinition.type ]( dialog, childObjList, childHtmlList, output, elementDefinition );
				}
			},
			commonPrototype = {
				isChanged: function() {
					return this.getValue() != this.getInitValue();
				},

				reset: function( noChangeEvent ) {
					this.setValue( this.getInitValue(), noChangeEvent );
				},

				setInitValue: function() {
					this._.initValue = this.getValue();
				},

				resetInitValue: function() {
					this._.initValue = this._[ 'default' ];
				},

				getInitValue: function() {
					return this._.initValue;
				}
			},
			commonEventProcessors = CKEDITOR.tools.extend( {}, CKEDITOR.ui.dialog.uiElement.prototype.eventProcessors, {
				onChange: function( dialog, func ) {
					if ( !this._.domOnChangeRegistered ) {
						dialog.on( 'load', function() {
							this.getInputElement().on( 'change', function() {
								// Make sure 'onchange' doesn't get fired after dialog closed. (https://dev.ckeditor.com/ticket/5719)
								if ( !dialog.parts.dialog.isVisible() )
									return;

								this.fire( 'change', { value: this.getValue() } );
							}, this );
						}, this );
						this._.domOnChangeRegistered = true;
					}

					this.on( 'change', func );
				}
			}, true ),
			eventRegex = /^on([A-Z]\w+)/,
			cleanInnerDefinition = function( def ) {
				// An inner UI element should not have the parent's type, title or events.
				for ( var i in def ) {
					if ( eventRegex.test( i ) || i == 'title' || i == 'type' )
						delete def[ i ];
				}
				return def;
			},
			// @context {CKEDITOR.dialog.uiElement} UI element (textarea or textInput)
			// @param {CKEDITOR.dom.event} evt
			toggleBidiKeyUpHandler = function( evt ) {
				var keystroke = evt.data.getKeystroke();

				// ALT + SHIFT + Home for LTR direction.
				if ( keystroke == CKEDITOR.SHIFT + CKEDITOR.ALT + 36 )
					this.setDirectionMarker( 'ltr' );

				// ALT + SHIFT + End for RTL direction.
				else if ( keystroke == CKEDITOR.SHIFT + CKEDITOR.ALT + 35 )
					this.setDirectionMarker( 'rtl' );
			};

		CKEDITOR.tools.extend( CKEDITOR.ui.dialog, {
			/**
			 * Base class for all dialog window elements with a textual label on the left.
			 *
			 * @class CKEDITOR.ui.dialog.labeledElement
			 * @extends CKEDITOR.ui.dialog.uiElement
			 * @constructor Creates a labeledElement class instance.
			 * @param {CKEDITOR.dialog} dialog Parent dialog window object.
			 * @param {CKEDITOR.dialog.definition.uiElement} elementDefinition
			 * The element definition. Accepted fields:
			 *
			 * * `label` (Required) The label string.
			 * * `labelLayout` (Optional) Put 'horizontal' here if the
			 *     label element is to be laid out horizontally. Otherwise a vertical
			 *     layout will be used.
			 * * `widths` (Optional) This applies only to horizontal
			 *     layouts &mdash; a two-element array of lengths to specify the widths of the
			 *     label and the content element.
			 * * `role` (Optional) Value for the `role` attribute.
			 * * `includeLabel` (Optional) If set to `true`, the `aria-labelledby` attribute
			 *     will be included.
			 *
			 * @param {Array} htmlList The list of HTML code to output to.
			 * @param {Function} contentHtml
			 * A function returning the HTML code string to be added inside the content
			 * cell.
			 */
			labeledElement: function( dialog, elementDefinition, htmlList, contentHtml ) {
				if ( arguments.length < 4 )
					return;

				var _ = initPrivateObject.call( this, elementDefinition );
				_.labelId = CKEDITOR.tools.getNextId() + '_label';
				this._.children = [];

				var innerHTML = function() {
						var html = [],
							requiredClass = elementDefinition.required ? ' cke_required' : '';
						if ( elementDefinition.labelLayout != 'horizontal' ) {
							html.push(
								'<label class="cke_dialog_ui_labeled_label' + requiredClass + '" ', ' id="' + _.labelId + '"',
									( _.inputId ? ' for="' + _.inputId + '"' : '' ),
									( elementDefinition.labelStyle ? ' style="' + elementDefinition.labelStyle + '"' : '' ) + '>',
									elementDefinition.label,
								'</label>',
								'<div class="cke_dialog_ui_labeled_content"',
									( elementDefinition.controlStyle ? ' style="' + elementDefinition.controlStyle + '"' : '' ),
									' role="presentation">',
									contentHtml.call( this, dialog, elementDefinition ),
								'</div>' );
						} else {
							var hboxDefinition = {
								type: 'hbox',
								widths: elementDefinition.widths,
								padding: 0,
								children: [ {
									type: 'html',
									html: '<label class="cke_dialog_ui_labeled_label' + requiredClass + '"' +
										' id="' + _.labelId + '"' +
										' for="' + _.inputId + '"' +
										( elementDefinition.labelStyle ? ' style="' + elementDefinition.labelStyle + '"' : '' ) + '>' +
											CKEDITOR.tools.htmlEncode( elementDefinition.label ) +
										'</label>'
								},
								{
									type: 'html',
									html: '<span class="cke_dialog_ui_labeled_content"' + ( elementDefinition.controlStyle ? ' style="' + elementDefinition.controlStyle + '"' : '' ) + '>' +
										contentHtml.call( this, dialog, elementDefinition ) +
										'</span>'
								} ]
							};
							CKEDITOR.dialog._.uiElementBuilders.hbox.build( dialog, hboxDefinition, html );
						}
						return html.join( '' );
					};
				var attributes = { role: elementDefinition.role || 'presentation' };

				if ( elementDefinition.includeLabel )
					attributes[ 'aria-labelledby' ] = _.labelId;

				CKEDITOR.ui.dialog.uiElement.call( this, dialog, elementDefinition, htmlList, 'div', null, attributes, innerHTML );
			},

			/**
			 * A text input with a label. This UI element class represents both the
			 * single-line text inputs and password inputs in dialog boxes.
			 *
			 * Since 4.11.0 it also represents the phone number input.
			 *
			 * @class CKEDITOR.ui.dialog.textInput
			 * @extends CKEDITOR.ui.dialog.labeledElement
			 * @constructor Creates a textInput class instance.
			 * @param {CKEDITOR.dialog} dialog Parent dialog window object.
			 * @param {CKEDITOR.dialog.definition.uiElement} elementDefinition
			 * The element definition. Accepted fields:
			 *
			 * * `default` (Optional) The default value.
			 * * `validate` (Optional) The validation function.
			 * * `maxLength` (Optional) The maximum length of text box contents.
			 * * `size` (Optional) The size of the text box. This is
			 *     usually overridden by the size defined by the skin, though.
			 *
			 * @param {Array} htmlList List of HTML code to output to.
			 */
			textInput: function( dialog, elementDefinition, htmlList ) {
				if ( arguments.length < 3 )
					return;

				initPrivateObject.call( this, elementDefinition );
				var domId = this._.inputId = CKEDITOR.tools.getNextId() + '_textInput',
					attributes = { 'class': 'cke_dialog_ui_input_' + elementDefinition.type, id: domId, type: elementDefinition.type };

				// Set the validator, if any.
				if ( elementDefinition.validate )
					this.validate = elementDefinition.validate;

				// Set the max length and size.
				if ( elementDefinition.maxLength )
					attributes.maxlength = elementDefinition.maxLength;
				if ( elementDefinition.size )
					attributes.size = elementDefinition.size;

				if ( elementDefinition.inputStyle )
					attributes.style = elementDefinition.inputStyle;

				// If user presses Enter in a text box, it implies clicking OK for the dialog.
				var me = this,
					keyPressedOnMe = false;
				dialog.on( 'load', function() {
					me.getInputElement().on( 'keydown', function( evt ) {
						if ( evt.data.getKeystroke() == 13 )
							keyPressedOnMe = true;
					} );

					// Lower the priority this 'keyup' since 'ok' will close the dialog.(https://dev.ckeditor.com/ticket/3749)
					me.getInputElement().on( 'keyup', function( evt ) {
						if ( evt.data.getKeystroke() == 13 && keyPressedOnMe ) {
							dialog.getButton( 'ok' ) && setTimeout( function() {
								dialog.getButton( 'ok' ).click();
							}, 0 );
							keyPressedOnMe = false;
						}

						if ( me.bidi )
							toggleBidiKeyUpHandler.call( me, evt );
					}, null, null, 1000 );
				} );

				var innerHTML = function() {
						// IE BUG: Text input fields in IE at 100% would exceed a <td> or inline
						// container's width, so need to wrap it inside a <div>.
						var html = [ '<div class="cke_dialog_ui_input_', elementDefinition.type, '" role="presentation"' ];

						if ( elementDefinition.width )
							html.push( 'style="width:' + elementDefinition.width + '" ' );

						html.push( '><input ' );

						attributes[ 'aria-labelledby' ] = this._.labelId;
						this._.required && ( attributes[ 'aria-required' ] = this._.required );
						for ( var i in attributes )
							html.push( i + '="' + attributes[ i ] + '" ' );
						html.push( ' /></div>' );
						return html.join( '' );
					};
				CKEDITOR.ui.dialog.labeledElement.call( this, dialog, elementDefinition, htmlList, innerHTML );
			},

			/**
			 * A text area with a label at the top or on the left.
			 *
			 * @class CKEDITOR.ui.dialog.textarea
			 * @extends CKEDITOR.ui.dialog.labeledElement
			 * @constructor Creates a textarea class instance.
			 * @param {CKEDITOR.dialog} dialog Parent dialog window object.
			 * @param {CKEDITOR.dialog.definition.uiElement} elementDefinition
			 *
			 * The element definition. Accepted fields:
			 *
			 * * `rows` (Optional) The number of rows displayed.
			 *     Defaults to 5 if not defined.
			 * * `cols` (Optional) The number of cols displayed.
			 *     Defaults to 20 if not defined. Usually overridden by skins.
			 * * `default` (Optional) The default value.
			 * * `validate` (Optional) The validation function.
			 *
			 * @param {Array} htmlList List of HTML code to output to.
			 */
			textarea: function( dialog, elementDefinition, htmlList ) {
				if ( arguments.length < 3 )
					return;

				initPrivateObject.call( this, elementDefinition );
				var me = this,
					domId = this._.inputId = CKEDITOR.tools.getNextId() + '_textarea',
					attributes = {};

				if ( elementDefinition.validate )
					this.validate = elementDefinition.validate;

				// Generates the essential attributes for the textarea tag.
				attributes.rows = elementDefinition.rows || 5;
				attributes.cols = elementDefinition.cols || 20;

				attributes[ 'class' ] = 'cke_dialog_ui_input_textarea ' + ( elementDefinition[ 'class' ] || '' );

				if ( typeof elementDefinition.inputStyle != 'undefined' )
					attributes.style = elementDefinition.inputStyle;

				if ( elementDefinition.dir )
					attributes.dir = elementDefinition.dir;

				if ( me.bidi ) {
					dialog.on( 'load', function() {
						me.getInputElement().on( 'keyup', toggleBidiKeyUpHandler );
					}, me );
				}

				var innerHTML = function() {
						attributes[ 'aria-labelledby' ] = this._.labelId;
						this._.required && ( attributes[ 'aria-required' ] = this._.required );
						var html = [ '<div class="cke_dialog_ui_input_textarea" role="presentation"><textarea id="', domId, '" ' ];
						for ( var i in attributes )
							html.push( i + '="' + CKEDITOR.tools.htmlEncode( attributes[ i ] ) + '" ' );
						html.push( '>', CKEDITOR.tools.htmlEncode( me._[ 'default' ] ), '</textarea></div>' );
						return html.join( '' );
					};
				CKEDITOR.ui.dialog.labeledElement.call( this, dialog, elementDefinition, htmlList, innerHTML );
			},

			/**
			 * A single checkbox with a label on the right.
			 *
			 * @class CKEDITOR.ui.dialog.checkbox
			 * @extends CKEDITOR.ui.dialog.uiElement
			 * @constructor Creates a checkbox class instance.
			 * @param {CKEDITOR.dialog} dialog Parent dialog window object.
			 * @param {CKEDITOR.dialog.definition.uiElement} elementDefinition
			 * The element definition. Accepted fields:
			 *
			 * * `checked` (Optional) Whether the checkbox is checked
			 *     on instantiation. Defaults to `false`.
			 * * `validate` (Optional) The validation function.
			 * * `label` (Optional) The checkbox label.
			 *
			 * @param {Array} htmlList List of HTML code to output to.
			 */
			checkbox: function( dialog, elementDefinition, htmlList ) {
				if ( arguments.length < 3 )
					return;

				var _ = initPrivateObject.call( this, elementDefinition, { 'default': !!elementDefinition[ 'default' ] } );

				if ( elementDefinition.validate )
					this.validate = elementDefinition.validate;

				var innerHTML = function() {
						var myDefinition = CKEDITOR.tools.extend(
								{},
								elementDefinition,
								{
									id: elementDefinition.id ? elementDefinition.id + '_checkbox' : CKEDITOR.tools.getNextId() + '_checkbox'
								},
								true
							),
							html = [];

						var labelId = CKEDITOR.tools.getNextId() + '_label';
						var attributes = { 'class': 'cke_dialog_ui_checkbox_input', type: 'checkbox', 'aria-labelledby': labelId };
						cleanInnerDefinition( myDefinition );
						if ( elementDefinition[ 'default' ] )
							attributes.checked = 'checked';

						if ( typeof myDefinition.inputStyle != 'undefined' )
							myDefinition.style = myDefinition.inputStyle;

						_.checkbox = new CKEDITOR.ui.dialog.uiElement( dialog, myDefinition, html, 'input', null, attributes );
						html.push(
							' <label id="',
							labelId,
							'" for="',
							attributes.id,
							'"' + ( elementDefinition.labelStyle ? ' style="' + elementDefinition.labelStyle + '"' : '' ) + '>',
							CKEDITOR.tools.htmlEncode( elementDefinition.label ),
							'</label>'
						);
						return html.join( '' );
					};

				CKEDITOR.ui.dialog.uiElement.call( this, dialog, elementDefinition, htmlList, 'span', null, null, innerHTML );
			},

			/**
			 * A group of radio buttons.
			 *
			 * @class CKEDITOR.ui.dialog.radio
			 * @extends CKEDITOR.ui.dialog.labeledElement
			 * @constructor Creates a radio class instance.
			 * @param {CKEDITOR.dialog} dialog Parent dialog window object.
			 * @param {CKEDITOR.dialog.definition.uiElement} elementDefinition
			 * The element definition. Accepted fields:
			 *
			 * * `default` (Required) The default value.
			 * * `validate` (Optional) The validation function.
			 * * `items` (Required) An array of options. Each option
			 *     is a one- or two-item array of format `[ 'Description', 'Value' ]`. If `'Value'`
			 *     is missing, then the value would be assumed to be the same as the description.
			 *
			 * @param {Array} htmlList List of HTML code to output to.
			 */
			radio: function( dialog, elementDefinition, htmlList ) {
				if ( arguments.length < 3 )
					return;

				initPrivateObject.call( this, elementDefinition );

				if ( !this._[ 'default' ] )
					this._[ 'default' ] = this._.initValue = elementDefinition.items[ 0 ][ 1 ];

				if ( elementDefinition.validate )
					this.validate = elementDefinition.validate;

				var children = [],
					me = this;

				var innerHTML = function() {
					var inputHtmlList = [],
						html = [],
						commonName = ( elementDefinition.id ? elementDefinition.id : CKEDITOR.tools.getNextId() ) + '_radio';

					for ( var i = 0; i < elementDefinition.items.length; i++ ) {
						var item = elementDefinition.items[ i ],
							title = item[ 2 ] !== undefined ? item[ 2 ] : item[ 0 ],
							value = item[ 1 ] !== undefined ? item[ 1 ] : item[ 0 ],
							inputId = CKEDITOR.tools.getNextId() + '_radio_input',
							labelId = inputId + '_label',

							inputDefinition = CKEDITOR.tools.extend( {}, elementDefinition, {
								id: inputId,
								title: null,
								type: null
							}, true ),

							labelDefinition = CKEDITOR.tools.extend( {}, inputDefinition, {
								title: title
							}, true ),

							inputAttributes = {
								type: 'radio',
								'class': 'cke_dialog_ui_radio_input',
								name: commonName,
								value: value,
								'aria-labelledby': labelId
							},

							inputHtml = [];

						if ( me._[ 'default' ] == value )
							inputAttributes.checked = 'checked';

						cleanInnerDefinition( inputDefinition );
						cleanInnerDefinition( labelDefinition );

						if ( typeof inputDefinition.inputStyle != 'undefined' )
							inputDefinition.style = inputDefinition.inputStyle;

						// Make inputs of radio type focusable (https://dev.ckeditor.com/ticket/10866).
						inputDefinition.keyboardFocusable = true;

						children.push( new CKEDITOR.ui.dialog.uiElement( dialog, inputDefinition, inputHtml, 'input', null, inputAttributes ) );

						inputHtml.push( ' ' );

						new CKEDITOR.ui.dialog.uiElement( dialog, labelDefinition, inputHtml, 'label', null, {
							id: labelId,
							'for': inputAttributes.id
						}, item[ 0 ] );

						inputHtmlList.push( inputHtml.join( '' ) );
					}

					new CKEDITOR.ui.dialog.hbox( dialog, children, inputHtmlList, html );

					return html.join( '' );
				};

				// Adding a role="radiogroup" to definition used for wrapper.
				elementDefinition.role = 'radiogroup';
				elementDefinition.includeLabel = true;

				CKEDITOR.ui.dialog.labeledElement.call( this, dialog, elementDefinition, htmlList, innerHTML );
				this._.children = children;
			},

			/**
			 * A button with a label inside.
			 *
			 * @class CKEDITOR.ui.dialog.button
			 * @extends CKEDITOR.ui.dialog.uiElement
			 * @constructor Creates a button class instance.
			 * @param {CKEDITOR.dialog} dialog Parent dialog window object.
			 * @param {CKEDITOR.dialog.definition.uiElement} elementDefinition
			 * The element definition. Accepted fields:
			 *
			 * * `label` (Required) The button label.
			 * * `disabled` (Optional) Set to `true` if you want the
			 *     button to appear in the disabled state.
			 *
			 * @param {Array} htmlList List of HTML code to output to.
			 */
			button: function( dialog, elementDefinition, htmlList ) {
				if ( !arguments.length )
					return;

				if ( typeof elementDefinition == 'function' )
					elementDefinition = elementDefinition( dialog.getParentEditor() );

				initPrivateObject.call( this, elementDefinition, { disabled: elementDefinition.disabled || false } );

				// Add OnClick event to this input.
				CKEDITOR.event.implementOn( this );

				var me = this;

				// Register an event handler for processing button clicks.
				dialog.on( 'load', function() {
					var element = this.getElement();

					( function() {
						element.on( 'click', function( evt ) {
							me.click();
							// https://dev.ckeditor.com/ticket/9958
							evt.data.preventDefault();
						} );

						element.on( 'keydown', function( evt ) {
							if ( evt.data.getKeystroke() in { 32: 1 } ) {
								me.click();
								evt.data.preventDefault();
							}
						} );
					} )();

					element.unselectable();
				}, this );

				var outerDefinition = CKEDITOR.tools.extend( {}, elementDefinition );
				delete outerDefinition.style;

				var labelId = CKEDITOR.tools.getNextId() + '_label';
				CKEDITOR.ui.dialog.uiElement.call( this, dialog, outerDefinition, htmlList, 'a', null, {
					style: elementDefinition.style,
					href: 'javascript:void(0)', // jshint ignore:line
					title: elementDefinition.label,
					hidefocus: 'true',
					'class': elementDefinition[ 'class' ],
					role: 'button',
					'aria-labelledby': labelId
				}, '<span id="' + labelId + '" class="cke_dialog_ui_button">' +
											CKEDITOR.tools.htmlEncode( elementDefinition.label ) +
										'</span>' );
			},

			/**
			 * A select box.
			 *
			 * @class CKEDITOR.ui.dialog.select
			 * @extends CKEDITOR.ui.dialog.uiElement
			 * @constructor Creates a button class instance.
			 * @param {CKEDITOR.dialog} dialog Parent dialog window object.
			 * @param {CKEDITOR.dialog.definition.uiElement} elementDefinition
			 * The element definition. Accepted fields:
			 *
			 * * `default` (Required) The default value.
			 * * `validate` (Optional) The validation function.
			 * * `items` (Required) An array of options. Each option
			 *     is a one- or two-item array of format `[ 'Description', 'Value' ]`. If `'Value'`
			 *     is missing, then the value would be assumed to be the same as the
			 *     description.
			 * * `multiple` (Optional) Set this to `true` if you would like
			 *     to have a multiple-choice select box.
			 * * `size` (Optional) The number of items to display in
			 *     the select box.
			 *
			 * @param {Array} htmlList List of HTML code to output to.
			 */
			select: function( dialog, elementDefinition, htmlList ) {
				if ( arguments.length < 3 )
					return;

				var _ = initPrivateObject.call( this, elementDefinition );

				if ( elementDefinition.validate )
					this.validate = elementDefinition.validate;

				_.inputId = CKEDITOR.tools.getNextId() + '_select';

				var innerHTML = function() {
						var myDefinition = CKEDITOR.tools.extend(
								{},
								elementDefinition,
								{
									id: ( elementDefinition.id ? elementDefinition.id + '_select' : CKEDITOR.tools.getNextId() + '_select' )
								},
								true
							),
							html = [],
							innerHTML = [],
							attributes = { 'id': _.inputId, 'class': 'cke_dialog_ui_input_select', 'aria-labelledby': this._.labelId };

						html.push( '<div class="cke_dialog_ui_input_', elementDefinition.type, '" role="presentation"' );
						if ( elementDefinition.width )
							html.push( 'style="width:' + elementDefinition.width + '" ' );
						html.push( '>' );

						// Add multiple and size attributes from element definition.
						if ( elementDefinition.size !== undefined )
							attributes.size = elementDefinition.size;
						if ( elementDefinition.multiple !== undefined )
							attributes.multiple = elementDefinition.multiple;

						cleanInnerDefinition( myDefinition );
						for ( var i = 0, item; i < elementDefinition.items.length && ( item = elementDefinition.items[ i ] ); i++ ) {
							innerHTML.push( '<option value="', CKEDITOR.tools.htmlEncode( item[ 1 ] !== undefined ? item[ 1 ] : item[ 0 ] ).replace( /"/g, '&quot;' ), '" /> ', CKEDITOR.tools.htmlEncode( item[ 0 ] ) );
						}

						if ( typeof myDefinition.inputStyle != 'undefined' )
							myDefinition.style = myDefinition.inputStyle;

						_.select = new CKEDITOR.ui.dialog.uiElement( dialog, myDefinition, html, 'select', null, attributes, innerHTML.join( '' ) );

						html.push( '</div>' );

						return html.join( '' );
					};

				CKEDITOR.ui.dialog.labeledElement.call( this, dialog, elementDefinition, htmlList, innerHTML );
			},

			/**
			 * A file upload input.
			 *
			 * @class CKEDITOR.ui.dialog.file
			 * @extends CKEDITOR.ui.dialog.labeledElement
			 * @constructor Creates a file class instance.
			 * @param {CKEDITOR.dialog} dialog Parent dialog window object.
			 * @param {CKEDITOR.dialog.definition.uiElement} elementDefinition
			 * The element definition. Accepted fields:
			 *
			 * * `validate` (Optional) The validation function.
			 *
			 * @param {Array} htmlList List of HTML code to output to.
			 */
			file: function( dialog, elementDefinition, htmlList ) {
				if ( arguments.length < 3 )
					return;

				if ( elementDefinition[ 'default' ] === undefined )
					elementDefinition[ 'default' ] = '';

				var _ = CKEDITOR.tools.extend( initPrivateObject.call( this, elementDefinition ), { definition: elementDefinition, buttons: [] } );

				if ( elementDefinition.validate )
					this.validate = elementDefinition.validate;

				/** @ignore */
				var innerHTML = function() {
					_.frameId = CKEDITOR.tools.getNextId() + '_fileInput';

					var html = [
						'<iframe' +
							' frameborder="0"' +
							' allowtransparency="0"' +
							' class="cke_dialog_ui_input_file"' +
							' role="presentation"' +
							' id="', _.frameId, '"' +
							' title="', elementDefinition.label, '"' +
							' src="javascript:void('
					];

					// Support for custom document.domain on IE. (https://dev.ckeditor.com/ticket/10165)
					html.push( CKEDITOR.env.ie ?
						'(function(){' + encodeURIComponent(
							'document.open();' +
							'(' + CKEDITOR.tools.fixDomain + ')();' +
							'document.close();'
						) + '})()'
						:
						'0'
					);

					html.push( ')"></iframe>' );

					return html.join( '' );
				};

				// IE BUG: Parent container does not resize to contain the iframe automatically.
				dialog.on( 'load', function() {
					var iframe = CKEDITOR.document.getById( _.frameId ),
						contentDiv = iframe.getParent();
					contentDiv.addClass( 'cke_dialog_ui_input_file' );
				} );

				CKEDITOR.ui.dialog.labeledElement.call( this, dialog, elementDefinition, htmlList, innerHTML );
			},

			/**
			 * A button for submitting the file in a file upload input.
			 *
			 * @class CKEDITOR.ui.dialog.fileButton
			 * @extends CKEDITOR.ui.dialog.button
			 * @constructor Creates a fileButton class instance.
			 * @param {CKEDITOR.dialog} dialog Parent dialog window object.
			 * @param {CKEDITOR.dialog.definition.uiElement} elementDefinition
			 * The element definition. Accepted fields:
			 *
			 * * `for` (Required) The file input's page and element ID
			 *     to associate with, in a two-item array format: `[ 'page_id', 'element_id' ]`.
			 * * `validate` (Optional) The validation function.
			 *
			 * @param {Array} htmlList List of HTML code to output to.
			 */
			fileButton: function( dialog, elementDefinition, htmlList ) {
				var me = this;
				if ( arguments.length < 3 )
					return;

				initPrivateObject.call( this, elementDefinition );

				if ( elementDefinition.validate )
					this.validate = elementDefinition.validate;

				var myDefinition = CKEDITOR.tools.extend( {}, elementDefinition );
				var onClick = myDefinition.onClick;
				myDefinition.className = ( myDefinition.className ? myDefinition.className + ' ' : '' ) + 'cke_dialog_ui_button';
				myDefinition.onClick = function( evt ) {
					var target = elementDefinition[ 'for' ]; // [ pageId, elementId ]

					// If exists onClick in elementDefinition, then it is called and checked response type.
					// If it's possible, then XHR is used, what prevents of using submit.
					var responseType = onClick ? onClick.call( this, evt ) : false;

					if ( responseType !== false ) {
						if ( responseType !== 'xhr' ) {
							dialog.getContentElement( target[ 0 ], target[ 1 ] ).submit();
						}
						this.disable();
					}
				};

				dialog.on( 'load', function() {
					dialog.getContentElement( elementDefinition[ 'for' ][ 0 ], elementDefinition[ 'for' ][ 1 ] )._.buttons.push( me );
				} );

				CKEDITOR.ui.dialog.button.call( this, dialog, myDefinition, htmlList );
			},

			html: ( function() {
				var myHtmlRe = /^\s*<[\w:]+\s+([^>]*)?>/,
					theirHtmlRe = /^(\s*<[\w:]+(?:\s+[^>]*)?)((?:.|\r|\n)+)$/,
					emptyTagRe = /\/$/;
				/**
				 * A dialog window element made from raw HTML code.
				 *
				 * @class CKEDITOR.ui.dialog.html
				 * @extends CKEDITOR.ui.dialog.uiElement
				 * @constructor Creates a html class instance.
				 * @param {CKEDITOR.dialog} dialog Parent dialog window object.
				 * @param {CKEDITOR.dialog.definition.uiElement} elementDefinition Element definition.
				 * Accepted fields:
				 *
				 * * `html` (Required) HTML code of this element.
				 *
				 * @param {Array} htmlList List of HTML code to be added to the dialog's content area.
				 */
				return function( dialog, elementDefinition, htmlList ) {
					if ( arguments.length < 3 )
						return;

					var myHtmlList = [],
						myHtml,
						theirHtml = elementDefinition.html,
						myMatch, theirMatch;

					// If the HTML input doesn't contain any tags at the beginning, add a <span> tag around it.
					if ( theirHtml.charAt( 0 ) != '<' )
						theirHtml = '<span>' + theirHtml + '</span>';

					// Look for focus function in definition.
					var focus = elementDefinition.focus;
					if ( focus ) {
						var oldFocus = this.focus;
						this.focus = function() {
							( typeof focus == 'function' ? focus : oldFocus ).call( this );
							this.fire( 'focus' );
						};
						if ( elementDefinition.isFocusable ) {
							var oldIsFocusable = this.isFocusable;
							this.isFocusable = oldIsFocusable;
						}
						this.keyboardFocusable = true;
					}

					CKEDITOR.ui.dialog.uiElement.call( this, dialog, elementDefinition, myHtmlList, 'span', null, null, '' );

					// Append the attributes created by the uiElement call to the real HTML.
					myHtml = myHtmlList.join( '' );
					myMatch = myHtml.match( myHtmlRe );
					theirMatch = theirHtml.match( theirHtmlRe ) || [ '', '', '' ];

					if ( emptyTagRe.test( theirMatch[ 1 ] ) ) {
						theirMatch[ 1 ] = theirMatch[ 1 ].slice( 0, -1 );
						theirMatch[ 2 ] = '/' + theirMatch[ 2 ];
					}

					htmlList.push( [ theirMatch[ 1 ], ' ', myMatch[ 1 ] || '', theirMatch[ 2 ] ].join( '' ) );
				};
			} )(),

			/**
			 * Form fieldset for grouping dialog UI elements.
			 *
			 * @class CKEDITOR.ui.dialog.fieldset
			 * @extends CKEDITOR.ui.dialog.uiElement
			 * @constructor Creates a fieldset class instance.
			 * @param {CKEDITOR.dialog} dialog Parent dialog window object.
			 * @param {Array} childObjList
			 * Array of {@link CKEDITOR.ui.dialog.uiElement} objects inside this container.
			 * @param {Array} childHtmlList Array of HTML code that corresponds to the HTML output of all the
			 * objects in childObjList.
			 * @param {Array} htmlList Array of HTML code that this element will output to.
			 * @param {CKEDITOR.dialog.definition.uiElement} elementDefinition
			 * The element definition. Accepted fields:
			 *
			 * * `label` (Optional) The legend of the this fieldset.
			 * * `children` (Required) An array of dialog window field definitions which will be grouped inside this fieldset.
			 *
			 */
			fieldset: function( dialog, childObjList, childHtmlList, htmlList, elementDefinition ) {
				var legendLabel = elementDefinition.label;
				/** @ignore */
				var innerHTML = function() {
						var html = [];
						legendLabel && html.push( '<legend' +
							( elementDefinition.labelStyle ? ' style="' + elementDefinition.labelStyle + '"' : '' ) +
							'>' + legendLabel + '</legend>' );
						for ( var i = 0; i < childHtmlList.length; i++ )
							html.push( childHtmlList[ i ] );
						return html.join( '' );
					};

				this._ = { children: childObjList };
				CKEDITOR.ui.dialog.uiElement.call( this, dialog, elementDefinition, htmlList, 'fieldset', null, null, innerHTML );
			}

		}, true );

		CKEDITOR.ui.dialog.html.prototype = new CKEDITOR.ui.dialog.uiElement();

		/** @class CKEDITOR.ui.dialog.labeledElement */
		CKEDITOR.ui.dialog.labeledElement.prototype = CKEDITOR.tools.extend( new CKEDITOR.ui.dialog.uiElement(), {
			/**
			 * Sets the label text of the element.
			 *
			 * @param {String} label The new label text.
			 * @returns {CKEDITOR.ui.dialog.labeledElement} The current labeled element.
			 */
			setLabel: function( label ) {
				var node = CKEDITOR.document.getById( this._.labelId );
				if ( node.getChildCount() < 1 )
				( new CKEDITOR.dom.text( label, CKEDITOR.document ) ).appendTo( node );
				else
					node.getChild( 0 ).$.nodeValue = label;
				return this;
			},

			/**
			 * Retrieves the current label text of the elment.
			 *
			 * @returns {String} The current label text.
			 */
			getLabel: function() {
				var node = CKEDITOR.document.getById( this._.labelId );
				if ( !node || node.getChildCount() < 1 )
					return '';
				else
					return node.getChild( 0 ).getText();
			},

			/**
			 * Defines the `onChange` event for UI element definitions.
			 * @property {Object}
			 */
			eventProcessors: commonEventProcessors
		}, true );

		/** @class CKEDITOR.ui.dialog.button */
		CKEDITOR.ui.dialog.button.prototype = CKEDITOR.tools.extend( new CKEDITOR.ui.dialog.uiElement(), {
			/**
			 * Simulates a click to the button.
			 *
			 * @returns {Object} Return value of the `click` event.
			 */
			click: function() {
				if ( !this._.disabled )
					return this.fire( 'click', { dialog: this._.dialog } );
				return false;
			},

			/**
			 * Enables the button.
			 */
			enable: function() {
				this._.disabled = false;
				var element = this.getElement();
				element && element.removeClass( 'cke_disabled' );
			},

			/**
			 * Disables the button.
			 */
			disable: function() {
				this._.disabled = true;
				this.getElement().addClass( 'cke_disabled' );
			},

			/**
			 * Checks whether a field is visible.
			 *
			 * @returns {Boolean}
			 */
			isVisible: function() {
				return this.getElement().getFirst().isVisible();
			},

			/**
			 * Checks whether a field is enabled. Fields can be disabled by using the
			 * {@link #disable} method and enabled by using the {@link #enable} method.
			 *
			 * @returns {Boolean}
			 */
			isEnabled: function() {
				return !this._.disabled;
			},

			/**
			 * Defines the `onChange` event and `onClick` for button element definitions.
			 *
			 * @property {Object}
			 */
			eventProcessors: CKEDITOR.tools.extend( {}, CKEDITOR.ui.dialog.uiElement.prototype.eventProcessors, {
				onClick: function( dialog, func ) {
					this.on( 'click', function() {
						func.apply( this, arguments );
					} );
				}
			}, true ),

			/**
			 * Handler for the element's access key up event. Simulates a click to
			 * the button.
			 */
			accessKeyUp: function() {
				this.click();
			},

			/**
			 * Handler for the element's access key down event. Simulates a mouse
			 * down to the button.
			 */
			accessKeyDown: function() {
				this.focus();
			},

			keyboardFocusable: true
		}, true );

		/** @class CKEDITOR.ui.dialog.textInput */
		CKEDITOR.ui.dialog.textInput.prototype = CKEDITOR.tools.extend( new CKEDITOR.ui.dialog.labeledElement(), {
			/**
			 * Gets the text input DOM element under this UI object.
			 *
			 * @returns {CKEDITOR.dom.element} The DOM element of the text input.
			 */
			getInputElement: function() {
				return CKEDITOR.document.getById( this._.inputId );
			},

			/**
			 * Puts focus into the text input.
			 */
			focus: function() {
				var me = this.selectParentTab();

				// GECKO BUG: setTimeout() is needed to workaround invisible selections.
				setTimeout( function() {
					var element = me.getInputElement();
					element && element.$.focus();
				}, 0 );
			},

			/**
			 * Selects all the text in the text input.
			 */
			select: function() {
				var me = this.selectParentTab();

				// GECKO BUG: setTimeout() is needed to workaround invisible selections.
				setTimeout( function() {
					var e = me.getInputElement();
					if ( e ) {
						e.$.focus();
						e.$.select();
					}
				}, 0 );
			},

			/**
			 * Handler for the text input's access key up event. Makes a `select()`
			 * call to the text input.
			 */
			accessKeyUp: function() {
				this.select();
			},

			/**
			 * Sets the value of this text input object.
			 *
			 *		uiElement.setValue( 'Blamo' );
			 *
			 * @param {Object} value The new value.
			 * @returns {CKEDITOR.ui.dialog.textInput} The current UI element.
			 */
			setValue: function( value ) {
				if ( this.bidi ) {
					var marker = value && value.charAt( 0 ),
						dir = ( marker == '\u202A' ? 'ltr' : marker == '\u202B' ? 'rtl' : null );

					if ( dir ) {
						value = value.slice( 1 );
					}

					// Set the marker or reset it (if dir==null).
					this.setDirectionMarker( dir );
				}

				if ( !value ) {
					value = '';
				}

				return CKEDITOR.ui.dialog.uiElement.prototype.setValue.apply( this, arguments );
			},

			/**
			 * Gets the value of this text input object.
			 *
			 * @returns {String} The value.
			 */
			getValue: function() {
				var value = CKEDITOR.ui.dialog.uiElement.prototype.getValue.call( this );

				if ( this.bidi && value ) {
					var dir = this.getDirectionMarker();
					if ( dir ) {
						value = ( dir == 'ltr' ? '\u202A' : '\u202B' ) + value;
					}
				}

				return value;
			},

			/**
			 * Sets the text direction marker and the `dir` attribute of the input element.
			 *
			 * @since 4.5.0
			 * @param {String} dir The text direction. Pass `null` to reset.
			 */
			setDirectionMarker: function( dir ) {
				var inputElement = this.getInputElement();

				if ( dir ) {
					inputElement.setAttributes( {
						dir: dir,
						'data-cke-dir-marker': dir
					} );
				// Don't remove the dir attribute if this field hasn't got the marker,
				// because the dir attribute could be set independently.
				} else if ( this.getDirectionMarker() ) {
					inputElement.removeAttributes( [ 'dir', 'data-cke-dir-marker' ] );
				}
			},

			/**
			 * Gets the value of the text direction marker.
			 *
			 * @since 4.5.0
			 * @returns {String} `'ltr'`, `'rtl'` or `null` if the marker is not set.
			 */
			getDirectionMarker: function() {
				return this.getInputElement().data( 'cke-dir-marker' );
			},

			keyboardFocusable: true
		}, commonPrototype, true );

		CKEDITOR.ui.dialog.textarea.prototype = new CKEDITOR.ui.dialog.textInput();

		/** @class CKEDITOR.ui.dialog.select */
		CKEDITOR.ui.dialog.select.prototype = CKEDITOR.tools.extend( new CKEDITOR.ui.dialog.labeledElement(), {
			/**
			 * Gets the DOM element of the select box.
			 *
			 * @returns {CKEDITOR.dom.element} The `<select>` element of this UI element.
			 */
			getInputElement: function() {
				return this._.select.getElement();
			},

			/**
			 * Adds an option to the select box.
			 *
			 * @param {String} label Option label.
			 * @param {String} value (Optional) Option value, if not defined it will be
			 * assumed to be the same as the label.
			 * @param {Number} index (Optional) Position of the option to be inserted
			 * to. If not defined, the new option will be inserted to the end of list.
			 * @returns {CKEDITOR.ui.dialog.select} The current select UI element.
			 */
			add: function( label, value, index ) {
				var option = new CKEDITOR.dom.element( 'option', this.getDialog().getParentEditor().document ),
					selectElement = this.getInputElement().$;
				option.$.text = label;
				option.$.value = ( value === undefined || value === null ) ? label : value;
				if ( index === undefined || index === null ) {
					if ( CKEDITOR.env.ie ) {
						selectElement.add( option.$ );
					} else {
						selectElement.add( option.$, null );
					}
				} else {
					selectElement.add( option.$, index );
				}
				return this;
			},

			/**
			 * Removes an option from the selection list.
			 *
			 * @param {Number} index Index of the option to be removed.
			 * @returns {CKEDITOR.ui.dialog.select} The current select UI element.
			 */
			remove: function( index ) {
				var selectElement = this.getInputElement().$;
				selectElement.remove( index );
				return this;
			},

			/**
			 * Clears all options out of the selection list.
			 *
			 * @returns {CKEDITOR.ui.dialog.select} The current select UI element.
			 */
			clear: function() {
				var selectElement = this.getInputElement().$;
				while ( selectElement.length > 0 )
					selectElement.remove( 0 );
				return this;
			},

			keyboardFocusable: true
		}, commonPrototype, true );

		/** @class CKEDITOR.ui.dialog.checkbox */
		CKEDITOR.ui.dialog.checkbox.prototype = CKEDITOR.tools.extend( new CKEDITOR.ui.dialog.uiElement(), {
			/**
			 * Gets the checkbox DOM element.
			 *
			 * @returns {CKEDITOR.dom.element} The DOM element of the checkbox.
			 */
			getInputElement: function() {
				return this._.checkbox.getElement();
			},

			/**
			 * Sets the state of the checkbox.
			 *
			 * @param {Boolean} checked `true` to tick the checkbox, `false` to untick it.
			 * @param {Boolean} noChangeEvent Internal commit, to supress `change` event on this element.
			 */
			setValue: function( checked, noChangeEvent ) {
				this.getInputElement().$.checked = checked;
				!noChangeEvent && this.fire( 'change', { value: checked } );
			},

			/**
			 * Gets the state of the checkbox.
			 *
			 * @returns {Boolean} `true` means that the checkbox is ticked, `false` means it is not ticked.
			 */
			getValue: function() {
				return this.getInputElement().$.checked;
			},

			/**
			 * Handler for the access key up event. Toggles the checkbox.
			 */
			accessKeyUp: function() {
				this.setValue( !this.getValue() );
			},

			/**
			 * Defines the `onChange` event for UI element definitions.
			 *
			 * @property {Object}
			 */
			eventProcessors: {
				onChange: function( dialog, func ) {
					if ( !CKEDITOR.env.ie || ( CKEDITOR.env.version > 8 ) )
						return commonEventProcessors.onChange.apply( this, arguments );
					else {
						dialog.on( 'load', function() {
							var element = this._.checkbox.getElement();
							element.on( 'propertychange', function( evt ) {
								evt = evt.data.$;
								if ( evt.propertyName == 'checked' )
									this.fire( 'change', { value: element.$.checked } );
							}, this );
						}, this );
						this.on( 'change', func );
					}
					return null;
				}
			},

			keyboardFocusable: true
		}, commonPrototype, true );

		/** @class CKEDITOR.ui.dialog.radio */
		CKEDITOR.ui.dialog.radio.prototype = CKEDITOR.tools.extend( new CKEDITOR.ui.dialog.uiElement(), {
			/**
			 * Selects one of the radio buttons in this button group.
			 *
			 * @param {String} value The value of the button to be chcked.
			 * @param {Boolean} noChangeEvent Internal commit, to supress the `change` event on this element.
			 */
			setValue: function( value, noChangeEvent ) {
				var children = this._.children,
					item;
				for ( var i = 0;
				( i < children.length ) && ( item = children[ i ] ); i++ )
					item.getElement().$.checked = ( item.getValue() == value );
				!noChangeEvent && this.fire( 'change', { value: value } );
			},

			/**
			 * Gets the value of the currently selected radio button.
			 *
			 * @returns {String} The currently selected button's value.
			 */
			getValue: function() {
				var children = this._.children;
				for ( var i = 0; i < children.length; i++ ) {
					if ( children[ i ].getElement().$.checked )
						return children[ i ].getValue();
				}
				return null;
			},

			/**
			 * Handler for the access key up event. Focuses the currently
			 * selected radio button, or the first radio button if none is selected.
			 */
			accessKeyUp: function() {
				var children = this._.children,
					i;
				for ( i = 0; i < children.length; i++ ) {
					if ( children[ i ].getElement().$.checked ) {
						children[ i ].getElement().focus();
						return;
					}
				}
				children[ 0 ].getElement().focus();
			},

			/**
			 * Defines the `onChange` event for UI element definitions.
			 *
			 * @property {Object}
			 */
			eventProcessors: {
				onChange: function( dialog, func ) {
					if ( !CKEDITOR.env.ie || ( CKEDITOR.env.version > 8 ) )
						return commonEventProcessors.onChange.apply( this, arguments );
					else {
						dialog.on( 'load', function() {
							var children = this._.children,
								me = this;
							for ( var i = 0; i < children.length; i++ ) {
								var element = children[ i ].getElement();
								element.on( 'propertychange', function( evt ) {
									evt = evt.data.$;
									if ( evt.propertyName == 'checked' && this.$.checked )
										me.fire( 'change', { value: this.getAttribute( 'value' ) } );
								} );
							}
						}, this );
						this.on( 'change', func );
					}
					return null;
				}
			}
		}, commonPrototype, true );

		/** @class CKEDITOR.ui.dialog.file */
		CKEDITOR.ui.dialog.file.prototype = CKEDITOR.tools.extend( new CKEDITOR.ui.dialog.labeledElement(), commonPrototype, {
			/**
			 * Gets the `<input>` element of this file input.
			 *
			 * @returns {CKEDITOR.dom.element} The file input element.
			 */
			getInputElement: function() {
				var frameDocument = CKEDITOR.document.getById( this._.frameId ).getFrameDocument();
				return frameDocument.$.forms.length > 0 ? new CKEDITOR.dom.element( frameDocument.$.forms[ 0 ].elements[ 0 ] ) : this.getElement();
			},

			/**
			 * Uploads the file in the file input.
			 *
			 * @returns {CKEDITOR.ui.dialog.file} This object.
			 */
			submit: function() {
				this.getInputElement().getParent().$.submit();
				return this;
			},

			/**
			 * Gets the action assigned to the form.
			 *
			 * @returns {String} The value of the action.
			 */
			getAction: function() {
				return this.getInputElement().getParent().$.action;
			},

			/**
			 * The events must be applied to the inner input element, and
			 * this must be done when the iframe and form have been loaded.
			 */
			registerEvents: function( definition ) {
				var regex = /^on([A-Z]\w+)/,
					match;

				var registerDomEvent = function( uiElement, dialog, eventName, func ) {
						uiElement.on( 'formLoaded', function() {
							uiElement.getInputElement().on( eventName, func, uiElement );
						} );
					};

				for ( var i in definition ) {
					if ( !( match = i.match( regex ) ) )
						continue;

					if ( this.eventProcessors[ i ] )
						this.eventProcessors[ i ].call( this, this._.dialog, definition[ i ] );
					else
						registerDomEvent( this, this._.dialog, match[ 1 ].toLowerCase(), definition[ i ] );
				}

				return this;
			},

			/**
			 * Redraws the file input and resets the file path in the file input.
			 * The redrawing logic is necessary because non-IE browsers tend to clear
			 * the `<iframe>` containing the file input after closing the dialog window.
			 */
			reset: function() {
				var _ = this._,
					frameElement = CKEDITOR.document.getById( _.frameId ),
					frameDocument = frameElement.getFrameDocument(),
					elementDefinition = _.definition,
					buttons = _.buttons,
					callNumber = this.formLoadedNumber,
					unloadNumber = this.formUnloadNumber,
					langDir = _.dialog._.editor.lang.dir,
					langCode = _.dialog._.editor.langCode;

				// The callback function for the iframe, but we must call tools.addFunction only once
				// so we store the function number in this.formLoadedNumber
				if ( !callNumber ) {
					callNumber = this.formLoadedNumber = CKEDITOR.tools.addFunction( function() {
						// Now we can apply the events to the input type=file
						this.fire( 'formLoaded' );
					}, this );

					// Remove listeners attached to the content of the iframe (the file input)
					unloadNumber = this.formUnloadNumber = CKEDITOR.tools.addFunction( function() {
						this.getInputElement().clearCustomData();
					}, this );

					this.getDialog()._.editor.on( 'destroy', function() {
						CKEDITOR.tools.removeFunction( callNumber );
						CKEDITOR.tools.removeFunction( unloadNumber );
					} );
				}

				function generateFormField() {
					frameDocument.$.open();

					var size = '';
					if ( elementDefinition.size )
						size = elementDefinition.size - ( CKEDITOR.env.ie ? 7 : 0 ); // "Browse" button is bigger in IE.

					var inputId = _.frameId + '_input';

					frameDocument.$.write( [
						'<html dir="' + langDir + '" lang="' + langCode + '"><head><title></title></head><body style="margin: 0; overflow: hidden; background: transparent;">',
							'<form enctype="multipart/form-data" method="POST" dir="' + langDir + '" lang="' + langCode + '" action="',
								CKEDITOR.tools.htmlEncode( elementDefinition.action ),
							'">',
								// Replicate the field label inside of iframe.
								'<label id="', _.labelId, '" for="', inputId, '" style="display:none">',
									CKEDITOR.tools.htmlEncode( elementDefinition.label ),
								'</label>',
								// Set width to make sure that input is not clipped by the iframe (https://dev.ckeditor.com/ticket/11253).
								'<input style="width:100%" id="', inputId, '" aria-labelledby="', _.labelId, '" type="file" name="',
									CKEDITOR.tools.htmlEncode( elementDefinition.id || 'cke_upload' ),
									'" size="',
									CKEDITOR.tools.htmlEncode( size > 0 ? size : '' ),
								'" />',
							'</form>',
						'</body></html>',
						'<script>',
							// Support for custom document.domain in IE.
							CKEDITOR.env.ie ? '(' + CKEDITOR.tools.fixDomain + ')();' : '',

							'window.parent.CKEDITOR.tools.callFunction(' + callNumber + ');',
							'window.onbeforeunload = function() {window.parent.CKEDITOR.tools.callFunction(' + unloadNumber + ')}',
						'</script>'
					].join( '' ) );

					frameDocument.$.close();

					for ( var i = 0; i < buttons.length; i++ )
						buttons[ i ].enable();
				}

				// https://dev.ckeditor.com/ticket/3465: Wait for the browser to finish rendering the dialog first.
				if ( CKEDITOR.env.gecko )
					setTimeout( generateFormField, 500 );
				else
					generateFormField();
			},

			getValue: function() {
				return this.getInputElement().$.value || '';
			},

			/**
			 * The default value of input `type="file"` is an empty string, but during the initialization
			 * of this UI element, the iframe still is not ready so it cannot be read from that object.
			 * Setting it manually prevents later issues with the current value (`''`) being different
			 * than the initial value (undefined as it asked for `.value` of a div).
			 */
			setInitValue: function() {
				this._.initValue = '';
			},

			/**
			 * Defines the `onChange` event for UI element definitions.
			 *
			 * @property {Object}
			 */
			eventProcessors: {
				onChange: function( dialog, func ) {
					// If this method is called several times (I'm not sure about how this can happen but the default
					// onChange processor includes this protection)
					// In order to reapply to the new element, the property is deleted at the beggining of the registerEvents method
					if ( !this._.domOnChangeRegistered ) {
						// By listening for the formLoaded event, this handler will get reapplied when a new
						// form is created
						this.on( 'formLoaded', function() {
							this.getInputElement().on( 'change', function() {
								this.fire( 'change', { value: this.getValue() } );
							}, this );
						}, this );
						this._.domOnChangeRegistered = true;
					}

					this.on( 'change', func );
				}
			},

			keyboardFocusable: true
		}, true );

		CKEDITOR.ui.dialog.fileButton.prototype = new CKEDITOR.ui.dialog.button();

		CKEDITOR.ui.dialog.fieldset.prototype = CKEDITOR.tools.clone( CKEDITOR.ui.dialog.hbox.prototype );

		CKEDITOR.dialog.addUIElement( 'text', textBuilder );
		CKEDITOR.dialog.addUIElement( 'password', textBuilder );
		CKEDITOR.dialog.addUIElement( 'tel', textBuilder );
		CKEDITOR.dialog.addUIElement( 'textarea', commonBuilder );
		CKEDITOR.dialog.addUIElement( 'checkbox', commonBuilder );
		CKEDITOR.dialog.addUIElement( 'radio', commonBuilder );
		CKEDITOR.dialog.addUIElement( 'button', commonBuilder );
		CKEDITOR.dialog.addUIElement( 'select', commonBuilder );
		CKEDITOR.dialog.addUIElement( 'file', commonBuilder );
		CKEDITOR.dialog.addUIElement( 'fileButton', commonBuilder );
		CKEDITOR.dialog.addUIElement( 'html', commonBuilder );
		CKEDITOR.dialog.addUIElement( 'fieldset', containerBuilder );
	}
} );

/**
 * Fired when the value of the uiElement is changed.
 *
 * @event change
 * @member CKEDITOR.ui.dialog.uiElement
 */

/**
 * Fired when the inner frame created by the element is ready.
 * Each time the button is used or the dialog window is loaded, a new
 * form might be created.
 *
 * @event formLoaded
 * @member CKEDITOR.ui.dialog.fileButton
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview The floating dialog plugin.
 */

/**
 * No resize for this dialog.
 *
 * @readonly
 * @property {Number} [=0]
 * @member CKEDITOR
 */
CKEDITOR.DIALOG_RESIZE_NONE = 0;

/**
 * Only allow horizontal resizing for this dialog, disable vertical resizing.
 *
 * @readonly
 * @property {Number} [=1]
 * @member CKEDITOR
 */
CKEDITOR.DIALOG_RESIZE_WIDTH = 1;

/**
 * Only allow vertical resizing for this dialog, disable horizontal resizing.
 *
 * @readonly
 * @property {Number} [=2]
 * @member CKEDITOR
 */
CKEDITOR.DIALOG_RESIZE_HEIGHT = 2;

/**
 * Allow the dialog to be resized in both directions.
 *
 * @readonly
 * @property {Number} [=3]
 * @member CKEDITOR
 */
CKEDITOR.DIALOG_RESIZE_BOTH = 3;

/**
 * Dialog state when idle.
 *
 * @readonly
 * @property {Number} [=1]
 * @member CKEDITOR
 */
CKEDITOR.DIALOG_STATE_IDLE = 1;

/**
 * Dialog state when busy.
 *
 * @readonly
 * @property {Number} [=2]
 * @member CKEDITOR
 */
CKEDITOR.DIALOG_STATE_BUSY = 2;

( function() {
	var cssLength = CKEDITOR.tools.cssLength;

	function isTabVisible( tabId ) {
		return !!this._.tabs[ tabId ][ 0 ].$.offsetHeight;
	}

	function getPreviousVisibleTab() {
		var tabId = this._.currentTabId,
			length = this._.tabIdList.length,
			tabIndex = CKEDITOR.tools.indexOf( this._.tabIdList, tabId ) + length;

		for ( var i = tabIndex - 1; i > tabIndex - length; i-- ) {
			if ( isTabVisible.call( this, this._.tabIdList[ i % length ] ) )
				return this._.tabIdList[ i % length ];
		}

		return null;
	}

	function getNextVisibleTab() {
		var tabId = this._.currentTabId,
			length = this._.tabIdList.length,
			tabIndex = CKEDITOR.tools.indexOf( this._.tabIdList, tabId );

		for ( var i = tabIndex + 1; i < tabIndex + length; i++ ) {
			if ( isTabVisible.call( this, this._.tabIdList[ i % length ] ) )
				return this._.tabIdList[ i % length ];
		}

		return null;
	}


	function clearOrRecoverTextInputValue( container, isRecover ) {
		var inputs = container.$.getElementsByTagName( 'input' );
		for ( var i = 0, length = inputs.length; i < length; i++ ) {
			var item = new CKEDITOR.dom.element( inputs[ i ] );

			if ( item.getAttribute( 'type' ).toLowerCase() == 'text' ) {
				if ( isRecover ) {
					item.setAttribute( 'value', item.getCustomData( 'fake_value' ) || '' );
					item.removeCustomData( 'fake_value' );
				} else {
					item.setCustomData( 'fake_value', item.getAttribute( 'value' ) );
					item.setAttribute( 'value', '' );
				}
			}
		}
	}

	// Handle dialog element validation state UI changes.
	function handleFieldValidated( isValid, msg ) {
		var input = this.getInputElement();
		if ( input )
			isValid ? input.removeAttribute( 'aria-invalid' ) : input.setAttribute( 'aria-invalid', true );

		if ( !isValid ) {
			if ( this.select )
				this.select();
			else
				this.focus();
		}

		msg && alert( msg ); // jshint ignore:line

		this.fire( 'validated', { valid: isValid, msg: msg } );
	}

	function resetField() {
		var input = this.getInputElement();
		input && input.removeAttribute( 'aria-invalid' );
	}

	var templateSource = '<div class="cke_reset_all {editorId} {editorDialogClass} {hidpi}' +
		'" dir="{langDir}"' +
		' lang="{langCode}"' +
		' role="dialog"' +
		' aria-labelledby="cke_dialog_title_{id}"' +
		'>' +
		'<table class="cke_dialog ' + CKEDITOR.env.cssClass + ' cke_{langDir}"' +
			' style="position:absolute" role="presentation">' +
			'<tr><td role="presentation">' +
			'<div class="cke_dialog_body" role="presentation">' +
				'<div id="cke_dialog_title_{id}" class="cke_dialog_title" role="presentation"></div>' +
				'<a id="cke_dialog_close_button_{id}" class="cke_dialog_close_button" href="javascript:void(0)" title="{closeTitle}" role="button"><span class="cke_label">X</span></a>' +
				'<div id="cke_dialog_tabs_{id}" class="cke_dialog_tabs" role="tablist"></div>' +
				'<table class="cke_dialog_contents" role="presentation">' +
				'<tr>' +
					'<td id="cke_dialog_contents_{id}" class="cke_dialog_contents_body" role="presentation"></td>' +
				'</tr>' +
				'<tr>' +
					'<td id="cke_dialog_footer_{id}" class="cke_dialog_footer" role="presentation"></td>' +
				'</tr>' +
				'</table>' +
			'</div>' +
			'</td></tr>' +
		'</table>' +
		'</div>';

	function buildDialog( editor ) {
		var element = CKEDITOR.dom.element.createFromHtml( CKEDITOR.addTemplate( 'dialog', templateSource ).output( {
			id: CKEDITOR.tools.getNextNumber(),
			editorId: editor.id,
			langDir: editor.lang.dir,
			langCode: editor.langCode,
			editorDialogClass: 'cke_editor_' + editor.name.replace( /\./g, '\\.' ) + '_dialog',
			closeTitle: editor.lang.common.close,
			hidpi: CKEDITOR.env.hidpi ? 'cke_hidpi' : ''
		} ) );

		// TODO: Change this to getById(), so it'll support custom templates.
		var body = element.getChild( [ 0, 0, 0, 0, 0 ] ),
			title = body.getChild( 0 ),
			close = body.getChild( 1 );

		// Don't allow dragging on dialog (https://dev.ckeditor.com/ticket/13184).
		editor.plugins.clipboard && CKEDITOR.plugins.clipboard.preventDefaultDropOnElement( body );

		// IFrame shim for dialog that masks activeX in IE. (https://dev.ckeditor.com/ticket/7619)
		if ( CKEDITOR.env.ie && !CKEDITOR.env.quirks && !CKEDITOR.env.edge ) {
			var src = 'javascript:void(function(){' + encodeURIComponent( 'document.open();(' + CKEDITOR.tools.fixDomain + ')();document.close();' ) + '}())', // jshint ignore:line
				iframe = CKEDITOR.dom.element.createFromHtml( '<iframe' +
					' frameBorder="0"' +
					' class="cke_iframe_shim"' +
					' src="' + src + '"' +
					' tabIndex="-1"' +
					'></iframe>' );
			iframe.appendTo( body.getParent() );
		}

		// Make the Title and Close Button unselectable.
		title.unselectable();
		close.unselectable();

		return {
			element: element,
			parts: {
				dialog: element.getChild( 0 ),
				title: title,
				close: close,
				tabs: body.getChild( 2 ),
				contents: body.getChild( [ 3, 0, 0, 0 ] ),
				footer: body.getChild( [ 3, 0, 1, 0 ] )
			}
		};
	}

	/**
	 * This is the base class for runtime dialog objects. An instance of this
	 * class represents a single named dialog for a single editor instance.
	 *
	 *		var dialogObj = new CKEDITOR.dialog( editor, 'smiley' );
	 *
	 * @class
	 * @constructor Creates a dialog class instance.
	 * @param {Object} editor The editor which created the dialog.
	 * @param {String} dialogName The dialog's registered name.
	 */
	CKEDITOR.dialog = function( editor, dialogName ) {
		// Load the dialog definition.
		var definition = CKEDITOR.dialog._.dialogDefinitions[ dialogName ],
			defaultDefinition = CKEDITOR.tools.clone( defaultDialogDefinition ),
			buttonsOrder = editor.config.dialog_buttonsOrder || 'OS',
			dir = editor.lang.dir,
			tabsToRemove = {},
			i, processed, stopPropagation;

		if ( ( buttonsOrder == 'OS' && CKEDITOR.env.mac ) || // The buttons in MacOS Apps are in reverse order (https://dev.ckeditor.com/ticket/4750)
		( buttonsOrder == 'rtl' && dir == 'ltr' ) || ( buttonsOrder == 'ltr' && dir == 'rtl' ) )
			defaultDefinition.buttons.reverse();


		// Completes the definition with the default values.
		definition = CKEDITOR.tools.extend( definition( editor ), defaultDefinition );

		// Clone a functionally independent copy for this dialog.
		definition = CKEDITOR.tools.clone( definition );

		// Create a complex definition object, extending it with the API
		// functions.
		definition = new definitionObject( this, definition );

		var themeBuilt = buildDialog( editor );

		// Initialize some basic parameters.
		this._ = {
			editor: editor,
			element: themeBuilt.element,
			name: dialogName,
			contentSize: { width: 0, height: 0 },
			size: { width: 0, height: 0 },
			contents: {},
			buttons: {},
			accessKeyMap: {},

			// Initialize the tab and page map.
			tabs: {},
			tabIdList: [],
			currentTabId: null,
			currentTabIndex: null,
			pageCount: 0,
			lastTab: null,
			tabBarMode: false,

			// Initialize the tab order array for input widgets.
			focusList: [],
			currentFocusIndex: 0,
			hasFocus: false
		};

		this.parts = themeBuilt.parts;

		CKEDITOR.tools.setTimeout( function() {
			editor.fire( 'ariaWidget', this.parts.contents );
		}, 0, this );

		// Set the startup styles for the dialog, avoiding it enlarging the
		// page size on the dialog creation.
		var startStyles = {
			position: CKEDITOR.env.ie6Compat ? 'absolute' : 'fixed',
			top: 0,
			visibility: 'hidden'
		};

		startStyles[ dir == 'rtl' ? 'right' : 'left' ] = 0;
		this.parts.dialog.setStyles( startStyles );


		// Call the CKEDITOR.event constructor to initialize this instance.
		CKEDITOR.event.call( this );

		// Fire the "dialogDefinition" event, making it possible to customize
		// the dialog definition.
		this.definition = definition = CKEDITOR.fire( 'dialogDefinition', {
			name: dialogName,
			definition: definition
		}, editor ).definition;

		// Cache tabs that should be removed.
		if ( !( 'removeDialogTabs' in editor._ ) && editor.config.removeDialogTabs ) {
			var removeContents = editor.config.removeDialogTabs.split( ';' );

			for ( i = 0; i < removeContents.length; i++ ) {
				var parts = removeContents[ i ].split( ':' );
				if ( parts.length == 2 ) {
					var removeDialogName = parts[ 0 ];
					if ( !tabsToRemove[ removeDialogName ] )
						tabsToRemove[ removeDialogName ] = [];
					tabsToRemove[ removeDialogName ].push( parts[ 1 ] );
				}
			}
			editor._.removeDialogTabs = tabsToRemove;
		}

		// Remove tabs of this dialog.
		if ( editor._.removeDialogTabs && ( tabsToRemove = editor._.removeDialogTabs[ dialogName ] ) ) {
			for ( i = 0; i < tabsToRemove.length; i++ )
				definition.removeContents( tabsToRemove[ i ] );
		}

		// Initialize load, show, hide, ok and cancel events.
		if ( definition.onLoad )
			this.on( 'load', definition.onLoad );

		if ( definition.onShow )
			this.on( 'show', definition.onShow );

		if ( definition.onHide )
			this.on( 'hide', definition.onHide );

		if ( definition.onOk ) {
			this.on( 'ok', function( evt ) {
				// Dialog confirm might probably introduce content changes (https://dev.ckeditor.com/ticket/5415).
				editor.fire( 'saveSnapshot' );
				setTimeout( function() {
					editor.fire( 'saveSnapshot' );
				}, 0 );
				if ( definition.onOk.call( this, evt ) === false )
					evt.data.hide = false;
			} );
		}

		// Set default dialog state.
		this.state = CKEDITOR.DIALOG_STATE_IDLE;

		if ( definition.onCancel ) {
			this.on( 'cancel', function( evt ) {
				if ( definition.onCancel.call( this, evt ) === false )
					evt.data.hide = false;
			} );
		}

		var me = this;

		// Iterates over all items inside all content in the dialog, calling a
		// function for each of them.
		var iterContents = function( func ) {
				var contents = me._.contents,
					stop = false;

				for ( var i in contents ) {
					for ( var j in contents[ i ] ) {
						stop = func.call( this, contents[ i ][ j ] );
						if ( stop )
							return;
					}
				}
			};

		this.on( 'ok', function( evt ) {
			iterContents( function( item ) {
				if ( item.validate ) {
					var retval = item.validate( this ),
						invalid = ( typeof retval == 'string' ) || retval === false;

					if ( invalid ) {
						evt.data.hide = false;
						evt.stop();
					}

					handleFieldValidated.call( item, !invalid, typeof retval == 'string' ? retval : undefined );
					return invalid;
				}
			} );
		}, this, null, 0 );

		this.on( 'cancel', function( evt ) {
			iterContents( function( item ) {
				if ( item.isChanged() ) {
					if ( !editor.config.dialog_noConfirmCancel && !confirm( editor.lang.common.confirmCancel ) ) // jshint ignore:line
						evt.data.hide = false;
					return true;
				}
			} );
		}, this, null, 0 );

		this.parts.close.on( 'click', function( evt ) {
			if ( this.fire( 'cancel', { hide: true } ).hide !== false )
				this.hide();
			evt.data.preventDefault();
		}, this );

		// Sort focus list according to tab order definitions.
		function setupFocus() {
			var focusList = me._.focusList;
			focusList.sort( function( a, b ) {
				// Mimics browser tab order logics;
				if ( a.tabIndex != b.tabIndex )
					return b.tabIndex - a.tabIndex;
				//  Sort is not stable in some browsers,
				// fall-back the comparator to 'focusIndex';
				else
					return a.focusIndex - b.focusIndex;
			} );

			var size = focusList.length;
			for ( var i = 0; i < size; i++ )
				focusList[ i ].focusIndex = i;
		}

		// Expects 1 or -1 as an offset, meaning direction of the offset change.
		function changeFocus( offset ) {
			var focusList = me._.focusList;
			offset = offset || 0;

			if ( focusList.length < 1 )
				return;

			var startIndex = me._.currentFocusIndex;

			if ( me._.tabBarMode && offset < 0 ) {
				// If we are in tab mode, we need to mimic that we started tabbing back from the first
				// focusList (so it will go to the last one).
				startIndex = 0;
			}

			// Trigger the 'blur' event of  any input element before anything,
			// since certain UI updates may depend on it.
			try {
				focusList[ startIndex ].getInputElement().$.blur();
			} catch ( e ) {}

			var currentIndex = startIndex,
				hasTabs = me._.pageCount > 1;

			do {
				currentIndex = currentIndex + offset;

				if ( hasTabs && !me._.tabBarMode && ( currentIndex == focusList.length || currentIndex == -1 ) ) {
					// If the dialog was not in tab mode, then focus the first tab (https://dev.ckeditor.com/ticket/13027).
					me._.tabBarMode = true;
					me._.tabs[ me._.currentTabId ][ 0 ].focus();
					me._.currentFocusIndex = -1;

					// Early return, in order to avoid accessing focusList[ -1 ].
					return;
				}

				currentIndex = ( currentIndex + focusList.length ) % focusList.length;

				if ( currentIndex == startIndex ) {
					break;
				}
			} while ( offset && !focusList[ currentIndex ].isFocusable() );

			focusList[ currentIndex ].focus();

			// Select whole field content.
			if ( focusList[ currentIndex ].type == 'text' )
				focusList[ currentIndex ].select();
		}

		this.changeFocus = changeFocus;


		function keydownHandler( evt ) {
			// If I'm not the top dialog, ignore.
			if ( me != CKEDITOR.dialog._.currentTop )
				return;

			var keystroke = evt.data.getKeystroke(),
				rtl = editor.lang.dir == 'rtl',
				arrowKeys = [ 37, 38, 39, 40 ],
				button;

			processed = stopPropagation = 0;

			if ( keystroke == 9 || keystroke == CKEDITOR.SHIFT + 9 ) {
				var shiftPressed = ( keystroke == CKEDITOR.SHIFT + 9 );
				changeFocus( shiftPressed ? -1 : 1 );
				processed = 1;
			} else if ( keystroke == CKEDITOR.ALT + 121 && !me._.tabBarMode && me.getPageCount() > 1 ) {
				// Alt-F10 puts focus into the current tab item in the tab bar.
				me._.tabBarMode = true;
				me._.tabs[ me._.currentTabId ][ 0 ].focus();
				me._.currentFocusIndex = -1;
				processed = 1;
			} else if ( CKEDITOR.tools.indexOf( arrowKeys, keystroke ) != -1 && me._.tabBarMode ) {
				// Array with key codes that activate previous tab.
				var prevKeyCodes = [
						// Depending on the lang dir: right or left key
						rtl ? 39 : 37,
						// Top/bot arrow: actually for both cases it's the same.
						38
					],
					nextId = CKEDITOR.tools.indexOf( prevKeyCodes, keystroke ) != -1 ? getPreviousVisibleTab.call( me ) : getNextVisibleTab.call( me );

				me.selectPage( nextId );
				me._.tabs[ nextId ][ 0 ].focus();
				processed = 1;
			} else if ( ( keystroke == 13 || keystroke == 32 ) && me._.tabBarMode ) {
				this.selectPage( this._.currentTabId );
				this._.tabBarMode = false;
				this._.currentFocusIndex = -1;
				changeFocus( 1 );
				processed = 1;
			}
			// If user presses enter key in a text box, it implies clicking OK for the dialog.
			else if ( keystroke == 13 /*ENTER*/ ) {
				// Don't do that for a target that handles ENTER.
				var target = evt.data.getTarget();
				if ( !target.is( 'a', 'button', 'select', 'textarea' ) && ( !target.is( 'input' ) || target.$.type != 'button' ) ) {
					button = this.getButton( 'ok' );
					button && CKEDITOR.tools.setTimeout( button.click, 0, button );
					processed = 1;
				}
				stopPropagation = 1; // Always block the propagation (https://dev.ckeditor.com/ticket/4269)
			} else if ( keystroke == 27 /*ESC*/ ) {
				button = this.getButton( 'cancel' );

				// If there's a Cancel button, click it, else just fire the cancel event and hide the dialog.
				if ( button )
					CKEDITOR.tools.setTimeout( button.click, 0, button );
				else {
					if ( this.fire( 'cancel', { hide: true } ).hide !== false )
						this.hide();
				}
				stopPropagation = 1; // Always block the propagation (https://dev.ckeditor.com/ticket/4269)
			} else {
				return;
			}

			keypressHandler( evt );
		}

		function keypressHandler( evt ) {
			if ( processed )
				evt.data.preventDefault( 1 );
			else if ( stopPropagation )
				evt.data.stopPropagation();
		}

		var dialogElement = this._.element;

		editor.focusManager.add( dialogElement, 1 );

		// Add the dialog keyboard handlers.
		this.on( 'show', function() {
			dialogElement.on( 'keydown', keydownHandler, this );

			// Some browsers instead, don't cancel key events in the keydown, but in the
			// keypress. So we must do a longer trip in those cases. (https://dev.ckeditor.com/ticket/4531,https://dev.ckeditor.com/ticket/8985)
			if ( CKEDITOR.env.gecko )
				dialogElement.on( 'keypress', keypressHandler, this );

		} );
		this.on( 'hide', function() {
			dialogElement.removeListener( 'keydown', keydownHandler );
			if ( CKEDITOR.env.gecko )
				dialogElement.removeListener( 'keypress', keypressHandler );

			// Reset fields state when closing dialog.
			iterContents( function( item ) {
				resetField.apply( item );
			} );
		} );
		this.on( 'iframeAdded', function( evt ) {
			var doc = new CKEDITOR.dom.document( evt.data.iframe.$.contentWindow.document );
			doc.on( 'keydown', keydownHandler, this, null, 0 );
		} );

		// Auto-focus logic in dialog.
		this.on( 'show', function() {
			// Setup tabIndex on showing the dialog instead of on loading
			// to allow dynamic tab order happen in dialog definition.
			setupFocus();

			var hasTabs = me._.pageCount > 1;

			if ( editor.config.dialog_startupFocusTab && hasTabs ) {
				me._.tabBarMode = true;
				me._.tabs[ me._.currentTabId ][ 0 ].focus();
				me._.currentFocusIndex = -1;
			} else if ( !this._.hasFocus ) {
				// https://dev.ckeditor.com/ticket/13114#comment:4.
				this._.currentFocusIndex = hasTabs ? -1 : this._.focusList.length - 1;

				// Decide where to put the initial focus.
				if ( definition.onFocus ) {
					var initialFocus = definition.onFocus.call( this );
					// Focus the field that the user specified.
					initialFocus && initialFocus.focus();
				}
				// Focus the first field in layout order.
				else {
					changeFocus( 1 );
				}
			}
		}, this, null, 0xffffffff );

		// IE6 BUG: Text fields and text areas are only half-rendered the first time the dialog appears in IE6 (https://dev.ckeditor.com/ticket/2661).
		// This is still needed after [2708] and [2709] because text fields in hidden TR tags are still broken.
		if ( CKEDITOR.env.ie6Compat ) {
			this.on( 'load', function() {
				var outer = this.getElement(),
					inner = outer.getFirst();
				inner.remove();
				inner.appendTo( outer );
			}, this );
		}

		initDragAndDrop( this );
		initResizeHandles( this );

		// Insert the title.
		( new CKEDITOR.dom.text( definition.title, CKEDITOR.document ) ).appendTo( this.parts.title );

		// Insert the tabs and contents.
		for ( i = 0; i < definition.contents.length; i++ ) {
			var page = definition.contents[ i ];
			page && this.addPage( page );
		}

		this.parts.tabs.on( 'click', function( evt ) {
			var target = evt.data.getTarget();
			// If we aren't inside a tab, bail out.
			if ( target.hasClass( 'cke_dialog_tab' ) ) {
				// Get the ID of the tab, without the 'cke_' prefix and the unique number suffix.
				var id = target.$.id;
				this.selectPage( id.substring( 4, id.lastIndexOf( '_' ) ) );

				if ( this._.tabBarMode ) {
					this._.tabBarMode = false;
					this._.currentFocusIndex = -1;
					changeFocus( 1 );
				}
				evt.data.preventDefault();
			}
		}, this );

		// Insert buttons.
		var buttonsHtml = [],
			buttons = CKEDITOR.dialog._.uiElementBuilders.hbox.build( this, {
				type: 'hbox',
				className: 'cke_dialog_footer_buttons',
				widths: [],
				children: definition.buttons
			}, buttonsHtml ).getChild();
		this.parts.footer.setHtml( buttonsHtml.join( '' ) );

		for ( i = 0; i < buttons.length; i++ )
			this._.buttons[ buttons[ i ].id ] = buttons[ i ];

		/**
		 * Current state of the dialog. Use the {@link #setState} method to update it.
		 * See the {@link #event-state} event to know more.
		 *
		 * @readonly
		 * @property {Number} [state=CKEDITOR.DIALOG_STATE_IDLE]
		 */
	};

	// Focusable interface. Use it via dialog.addFocusable.
	function Focusable( dialog, element, index ) {
		this.element = element;
		this.focusIndex = index;
		// TODO: support tabIndex for focusables.
		this.tabIndex = 0;
		this.isFocusable = function() {
			return !element.getAttribute( 'disabled' ) && element.isVisible();
		};
		this.focus = function() {
			dialog._.currentFocusIndex = this.focusIndex;
			this.element.focus();
		};
		// Bind events
		element.on( 'keydown', function( e ) {
			if ( e.data.getKeystroke() in { 32: 1, 13: 1 } )
				this.fire( 'click' );
		} );
		element.on( 'focus', function() {
			this.fire( 'mouseover' );
		} );
		element.on( 'blur', function() {
			this.fire( 'mouseout' );
		} );
	}

	// Re-layout the dialog on window resize.
	function resizeWithWindow( dialog ) {
		var win = CKEDITOR.document.getWindow();
		function resizeHandler() {
			dialog.layout();
		}
		win.on( 'resize', resizeHandler );
		dialog.on( 'hide', function() {
			win.removeListener( 'resize', resizeHandler );
		} );
	}

	CKEDITOR.dialog.prototype = {
		destroy: function() {
			this.hide();
			this._.element.remove();
		},

		/**
		 * Resizes the dialog.
		 *
		 *		dialogObj.resize( 800, 640 );
		 *
		 * @method
		 * @param {Number} width The width of the dialog in pixels.
		 * @param {Number} height The height of the dialog in pixels.
		 */
		resize: ( function() {
			return function( width, height ) {
				if ( this._.contentSize && this._.contentSize.width == width && this._.contentSize.height == height )
					return;

				CKEDITOR.dialog.fire( 'resize', {
					dialog: this,
					width: width,
					height: height
				}, this._.editor );

				this.fire( 'resize', {
					width: width,
					height: height
				}, this._.editor );

				var contents = this.parts.contents;
				contents.setStyles( {
					width: width + 'px',
					height: height + 'px'
				} );

				// Update dialog position when dimension get changed in RTL.
				if ( this._.editor.lang.dir == 'rtl' && this._.position )
					this._.position.x = CKEDITOR.document.getWindow().getViewPaneSize().width - this._.contentSize.width - parseInt( this._.element.getFirst().getStyle( 'right' ), 10 );

				this._.contentSize = { width: width, height: height };
			};
		} )(),

		/**
		 * Gets the current size of the dialog in pixels.
		 *
		 * var width = dialogObj.getSize().width;
		 *
		 * @returns {Object}
		 * @returns {Number} return.width
		 * @returns {Number} return.height
		 */
		getSize: function() {
			var element = this._.element.getFirst();
			return { width: element.$.offsetWidth || 0, height: element.$.offsetHeight || 0 };
		},

		/**
		 * Moves the dialog to an `(x, y)` coordinate relative to the window.
		 *
		 * dialogObj.move( 10, 40 );
		 *
		 * @method
		 * @param {Number} x The target x-coordinate.
		 * @param {Number} y The target y-coordinate.
		 * @param {Boolean} save Flag indicate whether the dialog position should be remembered on next open up.
		 */
		move: function( x, y, save ) {

			// The dialog may be fixed positioned or absolute positioned. Ask the
			// browser what is the current situation first.
			var element = this._.element.getFirst(), rtl = this._.editor.lang.dir == 'rtl';
			var isFixed = element.getComputedStyle( 'position' ) == 'fixed';

			// (https://dev.ckeditor.com/ticket/8888) In some cases of a very small viewport, dialog is incorrectly
			// positioned in IE7. It also happens that it remains sticky and user cannot
			// scroll down/up to reveal dialog's content below/above the viewport; this is
			// cumbersome.
			// The only way to fix this is to move mouse out of the browser and
			// go back to see that dialog position is automagically fixed. No events,
			// no style change - pure magic. This is a IE7 rendering issue, which can be
			// fixed with dummy style redraw on each move.
			if ( CKEDITOR.env.ie )
				element.setStyle( 'zoom', '100%' );

			if ( isFixed && this._.position && this._.position.x == x && this._.position.y == y )
				return;

			// Save the current position.
			this._.position = { x: x, y: y };

			// If not fixed positioned, add scroll position to the coordinates.
			if ( !isFixed ) {
				var scrollPosition = CKEDITOR.document.getWindow().getScrollPosition();
				x += scrollPosition.x;
				y += scrollPosition.y;
			}

			// Translate coordinate for RTL.
			if ( rtl ) {
				var dialogSize = this.getSize(), viewPaneSize = CKEDITOR.document.getWindow().getViewPaneSize();
				x = viewPaneSize.width - dialogSize.width - x;
			}

			var styles = { 'top': ( y > 0 ? y : 0 ) + 'px' };
			styles[ rtl ? 'right' : 'left' ] = ( x > 0 ? x : 0 ) + 'px';

			element.setStyles( styles );

			save && ( this._.moved = 1 );
		},

		/**
		 * Gets the dialog's position in the window.
		 *
		 *		var dialogX = dialogObj.getPosition().x;
		 *
		 * @returns {Object}
		 * @returns {Number} return.x
		 * @returns {Number} return.y
		 */
		getPosition: function() {
			return CKEDITOR.tools.extend( {}, this._.position );
		},

		/**
		 * Shows the dialog box.
		 *
		 *		dialogObj.show();
		 */
		show: function() {
			// Insert the dialog's element to the root document.
			var element = this._.element;
			var definition = this.definition;
			if ( !( element.getParent() && element.getParent().equals( CKEDITOR.document.getBody() ) ) )
				element.appendTo( CKEDITOR.document.getBody() );
			else
				element.setStyle( 'display', 'block' );

			// First, set the dialog to an appropriate size.
			this.resize(
				this._.contentSize && this._.contentSize.width || definition.width || definition.minWidth,
				this._.contentSize && this._.contentSize.height || definition.height || definition.minHeight
			);

			// Reset all inputs back to their default value.
			this.reset();

			// Selects the first tab if no tab is already selected.
			if ( this._.currentTabId === null ) {
				this.selectPage( this.definition.contents[ 0 ].id );
			}

			// Set z-index.
			if ( CKEDITOR.dialog._.currentZIndex === null )
				CKEDITOR.dialog._.currentZIndex = this._.editor.config.baseFloatZIndex;
			this._.element.getFirst().setStyle( 'z-index', CKEDITOR.dialog._.currentZIndex += 10 );

			// Maintain the dialog ordering and dialog cover.
			if ( CKEDITOR.dialog._.currentTop === null ) {
				CKEDITOR.dialog._.currentTop = this;
				this._.parentDialog = null;
				showCover( this._.editor );

			} else {
				this._.parentDialog = CKEDITOR.dialog._.currentTop;
				var parentElement = this._.parentDialog.getElement().getFirst();
				parentElement.$.style.zIndex -= Math.floor( this._.editor.config.baseFloatZIndex / 2 );
				CKEDITOR.dialog._.currentTop = this;
			}

			element.on( 'keydown', accessKeyDownHandler );
			element.on( 'keyup', accessKeyUpHandler );

			// Reset the hasFocus state.
			this._.hasFocus = false;

			for ( var i in definition.contents ) {
				if ( !definition.contents[ i ] )
					continue;

				var content = definition.contents[ i ],
					tab = this._.tabs[ content.id ],
					requiredContent = content.requiredContent,
					enableElements = 0;

				if ( !tab )
					continue;

				for ( var j in this._.contents[ content.id ] ) {
					var elem = this._.contents[ content.id ][ j ];

					if ( elem.type == 'hbox' || elem.type == 'vbox' || !elem.getInputElement() )
						continue;

					if ( elem.requiredContent && !this._.editor.activeFilter.check( elem.requiredContent ) )
						elem.disable();
					else {
						elem.enable();
						enableElements++;
					}
				}

				if ( !enableElements || ( requiredContent && !this._.editor.activeFilter.check( requiredContent ) ) )
					tab[ 0 ].addClass( 'cke_dialog_tab_disabled' );
				else
					tab[ 0 ].removeClass( 'cke_dialog_tab_disabled' );
			}

			CKEDITOR.tools.setTimeout( function() {
				this.layout();
				resizeWithWindow( this );

				this.parts.dialog.setStyle( 'visibility', '' );

				// Execute onLoad for the first show.
				this.fireOnce( 'load', {} );
				CKEDITOR.ui.fire( 'ready', this );

				this.fire( 'show', {} );
				this._.editor.fire( 'dialogShow', this );

				if ( !this._.parentDialog )
					this._.editor.focusManager.lock();

				// Save the initial values of the dialog.
				this.foreach( function( contentObj ) {
					contentObj.setInitValue && contentObj.setInitValue();
				} );

			}, 100, this );
		},

		/**
		 * Rearrange the dialog to its previous position or the middle of the window.
		 *
		 * @since 3.5.0
		 */
		layout: function() {
			var el = this.parts.dialog;
			var dialogSize = this.getSize();
			var win = CKEDITOR.document.getWindow(),
					viewSize = win.getViewPaneSize();

			var posX = ( viewSize.width - dialogSize.width ) / 2,
				posY = ( viewSize.height - dialogSize.height ) / 2;

			// Switch to absolute position when viewport is smaller than dialog size.
			if ( !CKEDITOR.env.ie6Compat ) {
				if ( dialogSize.height + ( posY > 0 ? posY : 0 ) > viewSize.height || dialogSize.width + ( posX > 0 ? posX : 0 ) > viewSize.width ) {
					el.setStyle( 'position', 'absolute' );
				} else {
					el.setStyle( 'position', 'fixed' );
				}
			}

			this.move( this._.moved ? this._.position.x : posX, this._.moved ? this._.position.y : posY );
		},

		/**
		 * Executes a function for each UI element.
		 *
		 * @param {Function} fn Function to execute for each UI element.
		 * @returns {CKEDITOR.dialog} The current dialog object.
		 */
		foreach: function( fn ) {
			for ( var i in this._.contents ) {
				for ( var j in this._.contents[ i ] ) {
					fn.call( this, this._.contents[i][j] );
				}
			}

			return this;
		},

		/**
		 * Resets all input values in the dialog.
		 *
		 *		dialogObj.reset();
		 *
		 * @method
		 * @chainable
		 */
		reset: ( function() {
			var fn = function( widget ) {
					if ( widget.reset )
						widget.reset( 1 );
				};
			return function() {
				this.foreach( fn );
				return this;
			};
		} )(),


		/**
		 * Calls the {@link CKEDITOR.dialog.definition.uiElement#setup} method of each
		 * of the UI elements, with the arguments passed through it.
		 * It is usually being called when the dialog is opened, to put the initial value inside the field.
		 *
		 *		dialogObj.setupContent();
		 *
		 *		var timestamp = ( new Date() ).valueOf();
		 *		dialogObj.setupContent( timestamp );
		 */
		setupContent: function() {
			var args = arguments;
			this.foreach( function( widget ) {
				if ( widget.setup )
					widget.setup.apply( widget, args );
			} );
		},

		/**
		 * Calls the {@link CKEDITOR.dialog.definition.uiElement#commit} method of each
		 * of the UI elements, with the arguments passed through it.
		 * It is usually being called when the user confirms the dialog, to process the values.
		 *
		 *		dialogObj.commitContent();
		 *
		 *		var timestamp = ( new Date() ).valueOf();
		 *		dialogObj.commitContent( timestamp );
		 */
		commitContent: function() {
			var args = arguments;
			this.foreach( function( widget ) {
				// Make sure IE triggers "change" event on last focused input before closing the dialog. (https://dev.ckeditor.com/ticket/7915)
				if ( CKEDITOR.env.ie && this._.currentFocusIndex == widget.focusIndex )
					widget.getInputElement().$.blur();

				if ( widget.commit )
					widget.commit.apply( widget, args );
			} );
		},

		/**
		 * Hides the dialog box.
		 *
		 *		dialogObj.hide();
		 */
		hide: function() {
			if ( !this.parts.dialog.isVisible() )
				return;

			this.fire( 'hide', {} );
			this._.editor.fire( 'dialogHide', this );
			// Reset the tab page.
			this.selectPage( this._.tabIdList[ 0 ] );
			var element = this._.element;
			element.setStyle( 'display', 'none' );
			this.parts.dialog.setStyle( 'visibility', 'hidden' );
			// Unregister all access keys associated with this dialog.
			unregisterAccessKey( this );

			// Close any child(top) dialogs first.
			while ( CKEDITOR.dialog._.currentTop != this )
				CKEDITOR.dialog._.currentTop.hide();

			// Maintain dialog ordering and remove cover if needed.
			if ( !this._.parentDialog )
				hideCover( this._.editor );
			else {
				var parentElement = this._.parentDialog.getElement().getFirst();
				parentElement.setStyle( 'z-index', parseInt( parentElement.$.style.zIndex, 10 ) + Math.floor( this._.editor.config.baseFloatZIndex / 2 ) );
			}
			CKEDITOR.dialog._.currentTop = this._.parentDialog;

			// Deduct or clear the z-index.
			if ( !this._.parentDialog ) {
				CKEDITOR.dialog._.currentZIndex = null;

				// Remove access key handlers.
				element.removeListener( 'keydown', accessKeyDownHandler );
				element.removeListener( 'keyup', accessKeyUpHandler );

				var editor = this._.editor;
				editor.focus();

				// Give a while before unlock, waiting for focus to return to the editable. (https://dev.ckeditor.com/ticket/172)
				setTimeout( function() {
					editor.focusManager.unlock();

					// Fixed iOS focus issue (https://dev.ckeditor.com/ticket/12381).
					// Keep in mind that editor.focus() does not work in this case.
					if ( CKEDITOR.env.iOS ) {
						editor.window.focus();
					}
				}, 0 );

			} else {
				CKEDITOR.dialog._.currentZIndex -= 10;
			}

			delete this._.parentDialog;
			// Reset the initial values of the dialog.
			this.foreach( function( contentObj ) {
				contentObj.resetInitValue && contentObj.resetInitValue();
			} );

			// Reset dialog state back to IDLE, if busy (https://dev.ckeditor.com/ticket/13213).
			this.setState( CKEDITOR.DIALOG_STATE_IDLE );
		},

		/**
		 * Adds a tabbed page into the dialog.
		 *
		 * @param {Object} contents Content definition.
		 */
		addPage: function( contents ) {
			if ( contents.requiredContent && !this._.editor.filter.check( contents.requiredContent ) )
				return;

			var pageHtml = [],
				titleHtml = contents.label ? ' title="' + CKEDITOR.tools.htmlEncode( contents.label ) + '"' : '',
				vbox = CKEDITOR.dialog._.uiElementBuilders.vbox.build( this, {
					type: 'vbox',
					className: 'cke_dialog_page_contents',
					children: contents.elements,
					expand: !!contents.expand,
					padding: contents.padding,
					style: contents.style || 'width: 100%;'
				}, pageHtml );

			var contentMap = this._.contents[ contents.id ] = {},
				cursor,
				children = vbox.getChild(),
				enabledFields = 0;

			while ( ( cursor = children.shift() ) ) {
				// Count all allowed fields.
				if ( !cursor.notAllowed && cursor.type != 'hbox' && cursor.type != 'vbox' )
					enabledFields++;

				contentMap[ cursor.id ] = cursor;
				if ( typeof cursor.getChild == 'function' )
					children.push.apply( children, cursor.getChild() );
			}

			// If all fields are disabled (because they are not allowed) hide this tab.
			if ( !enabledFields )
				contents.hidden = true;

			// Create the HTML for the tab and the content block.
			var page = CKEDITOR.dom.element.createFromHtml( pageHtml.join( '' ) );
			page.setAttribute( 'role', 'tabpanel' );

			var env = CKEDITOR.env;
			var tabId = 'cke_' + contents.id + '_' + CKEDITOR.tools.getNextNumber(),
				tab = CKEDITOR.dom.element.createFromHtml( [
					'<a class="cke_dialog_tab"',
					( this._.pageCount > 0 ? ' cke_last' : 'cke_first' ),
					titleHtml,
					( !!contents.hidden ? ' style="display:none"' : '' ),
					' id="', tabId, '"',
					env.gecko && !env.hc ? '' : ' href="javascript:void(0)"',
					' tabIndex="-1"',
					' hidefocus="true"',
					' role="tab">',
					contents.label,
					'</a>'
				].join( '' ) );

			page.setAttribute( 'aria-labelledby', tabId );

			// Take records for the tabs and elements created.
			this._.tabs[ contents.id ] = [ tab, page ];
			this._.tabIdList.push( contents.id );
			!contents.hidden && this._.pageCount++;
			this._.lastTab = tab;
			this.updateStyle();

			// Attach the DOM nodes.

			page.setAttribute( 'name', contents.id );
			page.appendTo( this.parts.contents );

			tab.unselectable();
			this.parts.tabs.append( tab );

			// Add access key handlers if access key is defined.
			if ( contents.accessKey ) {
				registerAccessKey( this, this, 'CTRL+' + contents.accessKey, tabAccessKeyDown, tabAccessKeyUp );
				this._.accessKeyMap[ 'CTRL+' + contents.accessKey ] = contents.id;
			}
		},

		/**
		 * Activates a tab page in the dialog by its id.
		 *
		 *		dialogObj.selectPage( 'tab_1' );
		 *
		 * @param {String} id The id of the dialog tab to be activated.
		 */
		selectPage: function( id ) {
			if ( this._.currentTabId == id )
				return;

			if ( this._.tabs[ id ][ 0 ].hasClass( 'cke_dialog_tab_disabled' ) )
				return;

			// If event was canceled - do nothing.
			if ( this.fire( 'selectPage', { page: id, currentPage: this._.currentTabId } ) === false )
				return;

			// Hide the non-selected tabs and pages.
			for ( var i in this._.tabs ) {
				var tab = this._.tabs[ i ][ 0 ],
					page = this._.tabs[ i ][ 1 ];
				if ( i != id ) {
					tab.removeClass( 'cke_dialog_tab_selected' );
					page.hide();
				}
				page.setAttribute( 'aria-hidden', i != id );
			}

			var selected = this._.tabs[ id ];
			selected[ 0 ].addClass( 'cke_dialog_tab_selected' );

			// [IE] an invisible input[type='text'] will enlarge it's width
			// if it's value is long when it shows, so we clear it's value
			// before it shows and then recover it (https://dev.ckeditor.com/ticket/5649)
			if ( CKEDITOR.env.ie6Compat || CKEDITOR.env.ie7Compat ) {
				clearOrRecoverTextInputValue( selected[ 1 ] );
				selected[ 1 ].show();
				setTimeout( function() {
					clearOrRecoverTextInputValue( selected[ 1 ], 1 );
				}, 0 );
			} else {
				selected[ 1 ].show();
			}

			this._.currentTabId = id;
			this._.currentTabIndex = CKEDITOR.tools.indexOf( this._.tabIdList, id );
		},

		/**
		 * Dialog state-specific style updates.
		 */
		updateStyle: function() {
			// If only a single page shown, a different style is used in the central pane.
			this.parts.dialog[ ( this._.pageCount === 1 ? 'add' : 'remove' ) + 'Class' ]( 'cke_single_page' );
		},

		/**
		 * Hides a page's tab away from the dialog.
		 *
		 *		dialog.hidePage( 'tab_3' );
		 *
		 * @param {String} id The page's Id.
		 */
		hidePage: function( id ) {
			var tab = this._.tabs[ id ] && this._.tabs[ id ][ 0 ];
			if ( !tab || this._.pageCount == 1 || !tab.isVisible() )
				return;
			// Switch to other tab first when we're hiding the active tab.
			else if ( id == this._.currentTabId )
				this.selectPage( getPreviousVisibleTab.call( this ) );

			tab.hide();
			this._.pageCount--;
			this.updateStyle();
		},

		/**
		 * Unhides a page's tab.
		 *
		 *		dialog.showPage( 'tab_2' );
		 *
		 * @param {String} id The page's Id.
		 */
		showPage: function( id ) {
			var tab = this._.tabs[ id ] && this._.tabs[ id ][ 0 ];
			if ( !tab )
				return;
			tab.show();
			this._.pageCount++;
			this.updateStyle();
		},

		/**
		 * Gets the root DOM element of the dialog.
		 *
		 *		var dialogElement = dialogObj.getElement().getFirst();
		 *		dialogElement.setStyle( 'padding', '5px' );
		 *
		 * @returns {CKEDITOR.dom.element} The `<span>` element containing this dialog.
		 */
		getElement: function() {
			return this._.element;
		},

		/**
		 * Gets the name of the dialog.
		 *
		 *		var dialogName = dialogObj.getName();
		 *
		 * @returns {String} The name of this dialog.
		 */
		getName: function() {
			return this._.name;
		},

		/**
		 * Gets a dialog UI element object from a dialog page.
		 *
		 *		dialogObj.getContentElement( 'tabId', 'elementId' ).setValue( 'Example' );
		 *
		 * @param {String} pageId id of dialog page.
		 * @param {String} elementId id of UI element.
		 * @returns {CKEDITOR.ui.dialog.uiElement} The dialog UI element.
		 */
		getContentElement: function( pageId, elementId ) {
			var page = this._.contents[ pageId ];
			return page && page[ elementId ];
		},

		/**
		 * Gets the value of a dialog UI element.
		 *
		 *		alert( dialogObj.getValueOf( 'tabId', 'elementId' ) );
		 *
		 * @param {String} pageId id of dialog page.
		 * @param {String} elementId id of UI element.
		 * @returns {Object} The value of the UI element.
		 */
		getValueOf: function( pageId, elementId ) {
			return this.getContentElement( pageId, elementId ).getValue();
		},

		/**
		 * Sets the value of a dialog UI element.
		 *
		 *		dialogObj.setValueOf( 'tabId', 'elementId', 'Example' );
		 *
		 * @param {String} pageId id of the dialog page.
		 * @param {String} elementId id of the UI element.
		 * @param {Object} value The new value of the UI element.
		 */
		setValueOf: function( pageId, elementId, value ) {
			return this.getContentElement( pageId, elementId ).setValue( value );
		},

		/**
		 * Gets the UI element of a button in the dialog's button row.
		 *
		 *		@returns {CKEDITOR.ui.dialog.button} The button object.
		 *
		 * @param {String} id The id of the button.
		 */
		getButton: function( id ) {
			return this._.buttons[ id ];
		},

		/**
		 * Simulates a click to a dialog button in the dialog's button row.
		 *
		 * @returns The return value of the dialog's `click` event.
		 *
		 * @param {String} id The id of the button.
		 */
		click: function( id ) {
			return this._.buttons[ id ].click();
		},

		/**
		 * Disables a dialog button.
		 *
		 * @param {String} id The id of the button.
		 */
		disableButton: function( id ) {
			return this._.buttons[ id ].disable();
		},

		/**
		 * Enables a dialog button.
		 *
		 * @param {String} id The id of the button.
		 */
		enableButton: function( id ) {
			return this._.buttons[ id ].enable();
		},

		/**
		 * Gets the number of pages in the dialog.
		 *
		 * @returns {Number} Page count.
		 */
		getPageCount: function() {
			return this._.pageCount;
		},

		/**
		 * Gets the editor instance which opened this dialog.
		 *
		 * @returns {CKEDITOR.editor} Parent editor instances.
		 */
		getParentEditor: function() {
			return this._.editor;
		},

		/**
		 * Gets the element that was selected when opening the dialog, if any.
		 *
		 * @returns {CKEDITOR.dom.element} The element that was selected, or `null`.
		 */
		getSelectedElement: function() {
			return this.getParentEditor().getSelection().getSelectedElement();
		},

		/**
		 * Adds element to dialog's focusable list.
		 *
		 * @param {CKEDITOR.dom.element} element
		 * @param {Number} [index]
		 */
		addFocusable: function( element, index ) {
			if ( typeof index == 'undefined' ) {
				index = this._.focusList.length;
				this._.focusList.push( new Focusable( this, element, index ) );
			} else {
				this._.focusList.splice( index, 0, new Focusable( this, element, index ) );
				for ( var i = index + 1; i < this._.focusList.length; i++ )
					this._.focusList[ i ].focusIndex++;
			}
		},

		/**
		 * Sets the dialog {@link #property-state}.
		 *
		 * @since 4.5.0
		 * @param {Number} state Either {@link CKEDITOR#DIALOG_STATE_IDLE} or {@link CKEDITOR#DIALOG_STATE_BUSY}.
		 */
		setState: function( state ) {
			var oldState = this.state;

			if ( oldState == state ) {
				return;
			}

			this.state = state;

			if ( state == CKEDITOR.DIALOG_STATE_BUSY ) {
				// Insert the spinner on demand.
				if ( !this.parts.spinner ) {
					var dir = this.getParentEditor().lang.dir,
						spinnerDef = {
							attributes: {
								'class': 'cke_dialog_spinner'
							},
							styles: {
								'float': dir == 'rtl' ? 'right' : 'left'
							}
						};

					spinnerDef.styles[ 'margin-' + ( dir == 'rtl' ? 'left' : 'right' ) ] = '8px';

					this.parts.spinner = CKEDITOR.document.createElement( 'div', spinnerDef );

					this.parts.spinner.setHtml( '&#8987;' );
					this.parts.spinner.appendTo( this.parts.title, 1 );
				}

				// Finally, show the spinner.
				this.parts.spinner.show();

				this.getButton( 'ok' ).disable();
			} else if ( state == CKEDITOR.DIALOG_STATE_IDLE ) {
				// Hide the spinner. But don't do anything if there is no spinner yet.
				this.parts.spinner && this.parts.spinner.hide();

				this.getButton( 'ok' ).enable();
			}

			this.fire( 'state', state );
		}
	};

	CKEDITOR.tools.extend( CKEDITOR.dialog, {
		/**
		 * Registers a dialog.
		 *
		 *		// Full sample plugin, which does not only register a dialog window but also adds an item to the context menu.
		 *		// To open the dialog window, choose "Open dialog" in the context menu.
		 *		CKEDITOR.plugins.add( 'myplugin', {
		 *			init: function( editor ) {
		 *				editor.addCommand( 'mydialog',new CKEDITOR.dialogCommand( 'mydialog' ) );
		 *
		 *				if ( editor.contextMenu ) {
		 *					editor.addMenuGroup( 'mygroup', 10 );
		 *					editor.addMenuItem( 'My Dialog', {
		 *						label: 'Open dialog',
		 *						command: 'mydialog',
		 *						group: 'mygroup'
		 *					} );
		 *					editor.contextMenu.addListener( function( element ) {
		 *						return { 'My Dialog': CKEDITOR.TRISTATE_OFF };
		 *					} );
		 *				}
		 *
		 *				CKEDITOR.dialog.add( 'mydialog', function( api ) {
		 *					// CKEDITOR.dialog.definition
		 *					var dialogDefinition = {
		 *						title: 'Sample dialog',
		 *						minWidth: 390,
		 *						minHeight: 130,
		 *						contents: [
		 *							{
		 *								id: 'tab1',
		 *								label: 'Label',
		 *								title: 'Title',
		 *								expand: true,
		 *								padding: 0,
		 *								elements: [
		 *									{
		 *										type: 'html',
		 *										html: '<p>This is some sample HTML content.</p>'
		 *									},
		 *									{
		 *										type: 'textarea',
		 *										id: 'textareaId',
		 *										rows: 4,
		 *										cols: 40
		 *									}
		 *								]
		 *							}
		 *						],
		 *						buttons: [ CKEDITOR.dialog.okButton, CKEDITOR.dialog.cancelButton ],
		 *						onOk: function() {
		 *							// "this" is now a CKEDITOR.dialog object.
		 *							// Accessing dialog elements:
		 *							var textareaObj = this.getContentElement( 'tab1', 'textareaId' );
		 *							alert( "You have entered: " + textareaObj.getValue() );
		 *						}
		 *					};
		 *
		 *					return dialogDefinition;
		 *				} );
		 *			}
		 *		} );
		 *
		 *		CKEDITOR.replace( 'editor1', { extraPlugins: 'myplugin' } );
		 *
		 * @static
		 * @param {String} name The dialog's name.
		 * @param {Function/String} dialogDefinition
		 * A function returning the dialog's definition, or the URL to the `.js` file holding the function.
		 * The function should accept an argument `editor` which is the current editor instance, and
		 * return an object conforming to {@link CKEDITOR.dialog.definition}.
		 * @see CKEDITOR.dialog.definition
		 */
		add: function( name, dialogDefinition ) {
			// Avoid path registration from multiple instances override definition.
			if ( !this._.dialogDefinitions[ name ] || typeof dialogDefinition == 'function' )
				this._.dialogDefinitions[ name ] = dialogDefinition;
		},

		/**
		 * @static
		 * @todo
		 */
		exists: function( name ) {
			return !!this._.dialogDefinitions[ name ];
		},

		/**
		 * @static
		 * @todo
		 */
		getCurrent: function() {
			return CKEDITOR.dialog._.currentTop;
		},

		/**
		 * Check whether tab wasn't removed by {@link CKEDITOR.config#removeDialogTabs}.
		 *
		 * @since 4.1.0
		 * @static
		 * @param {CKEDITOR.editor} editor
		 * @param {String} dialogName
		 * @param {String} tabName
		 * @returns {Boolean}
		 */
		isTabEnabled: function( editor, dialogName, tabName ) {
			var cfg = editor.config.removeDialogTabs;

			return !( cfg && cfg.match( new RegExp( '(?:^|;)' + dialogName + ':' + tabName + '(?:$|;)', 'i' ) ) );
		},

		/**
		 * The default OK button for dialogs. Fires the `ok` event and closes the dialog if the event succeeds.
		 *
		 * @static
		 * @method
		 */
		okButton: ( function() {
			var retval = function( editor, override ) {
					override = override || {};
					return CKEDITOR.tools.extend( {
						id: 'ok',
						type: 'button',
						label: editor.lang.common.ok,
						'class': 'cke_dialog_ui_button_ok',
						onClick: function( evt ) {
							var dialog = evt.data.dialog;
							if ( dialog.fire( 'ok', { hide: true } ).hide !== false )
								dialog.hide();
						}
					}, override, true );
				};
			retval.type = 'button';
			retval.override = function( override ) {
				return CKEDITOR.tools.extend( function( editor ) {
					return retval( editor, override );
				}, { type: 'button' }, true );
			};
			return retval;
		} )(),

		/**
		 * The default cancel button for dialogs. Fires the `cancel` event and
		 * closes the dialog if no UI element value changed.
		 *
		 * @static
		 * @method
		 */
		cancelButton: ( function() {
			var retval = function( editor, override ) {
					override = override || {};
					return CKEDITOR.tools.extend( {
						id: 'cancel',
						type: 'button',
						label: editor.lang.common.cancel,
						'class': 'cke_dialog_ui_button_cancel',
						onClick: function( evt ) {
							var dialog = evt.data.dialog;
							if ( dialog.fire( 'cancel', { hide: true } ).hide !== false )
								dialog.hide();
						}
					}, override, true );
				};
			retval.type = 'button';
			retval.override = function( override ) {
				return CKEDITOR.tools.extend( function( editor ) {
					return retval( editor, override );
				}, { type: 'button' }, true );
			};
			return retval;
		} )(),

		/**
		 * Registers a dialog UI element.
		 *
		 * @static
		 * @param {String} typeName The name of the UI element.
		 * @param {Function} builder The function to build the UI element.
		 */
		addUIElement: function( typeName, builder ) {
			this._.uiElementBuilders[ typeName ] = builder;
		}
	} );

	CKEDITOR.dialog._ = {
		uiElementBuilders: {},

		dialogDefinitions: {},

		currentTop: null,

		currentZIndex: null
	};

	// "Inherit" (copy actually) from CKEDITOR.event.
	CKEDITOR.event.implementOn( CKEDITOR.dialog );
	CKEDITOR.event.implementOn( CKEDITOR.dialog.prototype );

	var defaultDialogDefinition = {
		resizable: CKEDITOR.DIALOG_RESIZE_BOTH,
		minWidth: 600,
		minHeight: 400,
		buttons: [ CKEDITOR.dialog.okButton, CKEDITOR.dialog.cancelButton ]
	};

	// Tool function used to return an item from an array based on its id
	// property.
	var getById = function( array, id, recurse ) {
			for ( var i = 0, item;
			( item = array[ i ] ); i++ ) {
				if ( item.id == id )
					return item;
				if ( recurse && item[ recurse ] ) {
					var retval = getById( item[ recurse ], id, recurse );
					if ( retval )
						return retval;
				}
			}
			return null;
		};

	// Tool function used to add an item into an array.
	var addById = function( array, newItem, nextSiblingId, recurse, nullIfNotFound ) {
			if ( nextSiblingId ) {
				for ( var i = 0, item;
				( item = array[ i ] ); i++ ) {
					if ( item.id == nextSiblingId ) {
						array.splice( i, 0, newItem );
						return newItem;
					}

					if ( recurse && item[ recurse ] ) {
						var retval = addById( item[ recurse ], newItem, nextSiblingId, recurse, true );
						if ( retval )
							return retval;
					}
				}

				if ( nullIfNotFound )
					return null;
			}

			array.push( newItem );
			return newItem;
		};

	// Tool function used to remove an item from an array based on its id.
	var removeById = function( array, id, recurse ) {
			for ( var i = 0, item;
			( item = array[ i ] ); i++ ) {
				if ( item.id == id )
					return array.splice( i, 1 );
				if ( recurse && item[ recurse ] ) {
					var retval = removeById( item[ recurse ], id, recurse );
					if ( retval )
						return retval;
				}
			}
			return null;
		};

	/**
	 * This class is not really part of the API. It is the `definition` property value
	 * passed to `dialogDefinition` event handlers.
	 *
	 *		CKEDITOR.on( 'dialogDefinition', function( evt ) {
	 *			var definition = evt.data.definition;
	 *			var content = definition.getContents( 'page1' );
	 * 			// ...
	 *		} );
	 *
	 * @private
	 * @class CKEDITOR.dialog.definitionObject
	 * @extends CKEDITOR.dialog.definition
	 * @constructor Creates a definitionObject class instance.
	 */
	var definitionObject = function( dialog, dialogDefinition ) {
			// TODO : Check if needed.
			this.dialog = dialog;

			// Transform the contents entries in contentObjects.
			var contents = dialogDefinition.contents;
			for ( var i = 0, content;
			( content = contents[ i ] ); i++ )
				contents[ i ] = content && new contentObject( dialog, content );

			CKEDITOR.tools.extend( this, dialogDefinition );
		};

	definitionObject.prototype = {
		/**
		 * Gets a content definition.
		 *
		 * @param {String} id The id of the content definition.
		 * @returns {CKEDITOR.dialog.definition.content} The content definition matching id.
		 */
		getContents: function( id ) {
			return getById( this.contents, id );
		},

		/**
		 * Gets a button definition.
		 *
		 * @param {String} id The id of the button definition.
		 * @returns {CKEDITOR.dialog.definition.button} The button definition matching id.
		 */
		getButton: function( id ) {
			return getById( this.buttons, id );
		},

		/**
		 * Adds a content definition object under this dialog definition.
		 *
		 * @param {CKEDITOR.dialog.definition.content} contentDefinition The
		 * content definition.
		 * @param {String} [nextSiblingId] The id of an existing content
		 * definition which the new content definition will be inserted
		 * before. Omit if the new content definition is to be inserted as
		 * the last item.
		 * @returns {CKEDITOR.dialog.definition.content} The inserted content definition.
		 */
		addContents: function( contentDefinition, nextSiblingId ) {
			return addById( this.contents, contentDefinition, nextSiblingId );
		},

		/**
		 * Adds a button definition object under this dialog definition.
		 *
		 * @param {CKEDITOR.dialog.definition.button} buttonDefinition The
		 * button definition.
		 * @param {String} [nextSiblingId] The id of an existing button
		 * definition which the new button definition will be inserted
		 * before. Omit if the new button definition is to be inserted as
		 * the last item.
		 * @returns {CKEDITOR.dialog.definition.button} The inserted button definition.
		 */
		addButton: function( buttonDefinition, nextSiblingId ) {
			return addById( this.buttons, buttonDefinition, nextSiblingId );
		},

		/**
		 * Removes a content definition from this dialog definition.
		 *
		 * @param {String} id The id of the content definition to be removed.
		 * @returns {CKEDITOR.dialog.definition.content} The removed content definition.
		 */
		removeContents: function( id ) {
			removeById( this.contents, id );
		},

		/**
		 * Removes a button definition from the dialog definition.
		 *
		 * @param {String} id The id of the button definition to be removed.
		 * @returns {CKEDITOR.dialog.definition.button} The removed button definition.
		 */
		removeButton: function( id ) {
			removeById( this.buttons, id );
		}
	};

	/**
	 * This class is not really part of the API. It is the template of the
	 * objects representing content pages inside the
	 * CKEDITOR.dialog.definitionObject.
	 *
	 *		CKEDITOR.on( 'dialogDefinition', function( evt ) {
	 *			var definition = evt.data.definition;
	 *			var content = definition.getContents( 'page1' );
	 *			content.remove( 'textInput1' );
	 *			// ...
	 *		} );
	 *
	 * @private
	 * @class CKEDITOR.dialog.definition.contentObject
	 * @constructor Creates a contentObject class instance.
	 */
	function contentObject( dialog, contentDefinition ) {
		this._ = {
			dialog: dialog
		};

		CKEDITOR.tools.extend( this, contentDefinition );
	}

	contentObject.prototype = {
		/**
		 * Gets a UI element definition under the content definition.
		 *
		 * @param {String} id The id of the UI element definition.
		 * @returns {CKEDITOR.dialog.definition.uiElement}
		 */
		get: function( id ) {
			return getById( this.elements, id, 'children' );
		},

		/**
		 * Adds a UI element definition to the content definition.
		 *
		 * @param {CKEDITOR.dialog.definition.uiElement} elementDefinition The
		 * UI elemnet definition to be added.
		 * @param {String} nextSiblingId The id of an existing UI element
		 * definition which the new UI element definition will be inserted
		 * before. Omit if the new button definition is to be inserted as
		 * the last item.
		 * @returns {CKEDITOR.dialog.definition.uiElement} The element definition inserted.
		 */
		add: function( elementDefinition, nextSiblingId ) {
			return addById( this.elements, elementDefinition, nextSiblingId, 'children' );
		},

		/**
		 * Removes a UI element definition from the content definition.
		 *
		 * @param {String} id The id of the UI element definition to be removed.
		 * @returns {CKEDITOR.dialog.definition.uiElement} The element definition removed.
		 */
		remove: function( id ) {
			removeById( this.elements, id, 'children' );
		}
	};

	function initDragAndDrop( dialog ) {
		var lastCoords = null,
			abstractDialogCoords = null,
			editor = dialog.getParentEditor(),
			magnetDistance = editor.config.dialog_magnetDistance,
			margins = CKEDITOR.skin.margins || [ 0, 0, 0, 0 ];

		if ( typeof magnetDistance == 'undefined' )
			magnetDistance = 20;

		function mouseMoveHandler( evt ) {
			var dialogSize = dialog.getSize(),
				viewPaneSize = CKEDITOR.document.getWindow().getViewPaneSize(),
				x = evt.data.$.screenX,
				y = evt.data.$.screenY,
				dx = x - lastCoords.x,
				dy = y - lastCoords.y,
				realX, realY;

			lastCoords = { x: x, y: y };
			abstractDialogCoords.x += dx;
			abstractDialogCoords.y += dy;

			if ( abstractDialogCoords.x + margins[ 3 ] < magnetDistance )
				realX = -margins[ 3 ];
			else if ( abstractDialogCoords.x - margins[ 1 ] > viewPaneSize.width - dialogSize.width - magnetDistance )
				realX = viewPaneSize.width - dialogSize.width + ( editor.lang.dir == 'rtl' ? 0 : margins[ 1 ] );
			else
				realX = abstractDialogCoords.x;

			if ( abstractDialogCoords.y + margins[ 0 ] < magnetDistance )
				realY = -margins[ 0 ];
			else if ( abstractDialogCoords.y - margins[ 2 ] > viewPaneSize.height - dialogSize.height - magnetDistance )
				realY = viewPaneSize.height - dialogSize.height + margins[ 2 ];
			else
				realY = abstractDialogCoords.y;

			dialog.move( realX, realY, 1 );

			evt.data.preventDefault();
		}

		function mouseUpHandler() {
			CKEDITOR.document.removeListener( 'mousemove', mouseMoveHandler );
			CKEDITOR.document.removeListener( 'mouseup', mouseUpHandler );

			if ( CKEDITOR.env.ie6Compat ) {
				var coverDoc = currentCover.getChild( 0 ).getFrameDocument();
				coverDoc.removeListener( 'mousemove', mouseMoveHandler );
				coverDoc.removeListener( 'mouseup', mouseUpHandler );
			}
		}

		dialog.parts.title.on( 'mousedown', function( evt ) {
			lastCoords = { x: evt.data.$.screenX, y: evt.data.$.screenY };

			CKEDITOR.document.on( 'mousemove', mouseMoveHandler );
			CKEDITOR.document.on( 'mouseup', mouseUpHandler );
			abstractDialogCoords = dialog.getPosition();

			if ( CKEDITOR.env.ie6Compat ) {
				var coverDoc = currentCover.getChild( 0 ).getFrameDocument();
				coverDoc.on( 'mousemove', mouseMoveHandler );
				coverDoc.on( 'mouseup', mouseUpHandler );
			}

			evt.data.preventDefault();
		}, dialog );
	}

	function initResizeHandles( dialog ) {
		var def = dialog.definition,
			resizable = def.resizable;

		if ( resizable == CKEDITOR.DIALOG_RESIZE_NONE )
			return;

		var editor = dialog.getParentEditor();
		var wrapperWidth, wrapperHeight, viewSize, origin, startSize, dialogCover;

		var mouseDownFn = CKEDITOR.tools.addFunction( function( $event ) {
			startSize = dialog.getSize();

			var content = dialog.parts.contents,
				iframeDialog = content.$.getElementsByTagName( 'iframe' ).length;

			// Shim to help capturing "mousemove" over iframe.
			if ( iframeDialog ) {
				dialogCover = CKEDITOR.dom.element.createFromHtml( '<div class="cke_dialog_resize_cover" style="height: 100%; position: absolute; width: 100%;"></div>' );
				content.append( dialogCover );
			}

			// Calculate the offset between content and chrome size.
			wrapperHeight = startSize.height - dialog.parts.contents.getSize( 'height', !( CKEDITOR.env.gecko || CKEDITOR.env.ie && CKEDITOR.env.quirks ) );
			wrapperWidth = startSize.width - dialog.parts.contents.getSize( 'width', 1 );

			origin = { x: $event.screenX, y: $event.screenY };

			viewSize = CKEDITOR.document.getWindow().getViewPaneSize();

			CKEDITOR.document.on( 'mousemove', mouseMoveHandler );
			CKEDITOR.document.on( 'mouseup', mouseUpHandler );

			if ( CKEDITOR.env.ie6Compat ) {
				var coverDoc = currentCover.getChild( 0 ).getFrameDocument();
				coverDoc.on( 'mousemove', mouseMoveHandler );
				coverDoc.on( 'mouseup', mouseUpHandler );
			}

			$event.preventDefault && $event.preventDefault();
		} );

		// Prepend the grip to the dialog.
		dialog.on( 'load', function() {
			var direction = '';
			if ( resizable == CKEDITOR.DIALOG_RESIZE_WIDTH )
				direction = ' cke_resizer_horizontal';
			else if ( resizable == CKEDITOR.DIALOG_RESIZE_HEIGHT )
				direction = ' cke_resizer_vertical';
			var resizer = CKEDITOR.dom.element.createFromHtml(
				'<div' +
				' class="cke_resizer' + direction + ' cke_resizer_' + editor.lang.dir + '"' +
				' title="' + CKEDITOR.tools.htmlEncode( editor.lang.common.resize ) + '"' +
				' onmousedown="CKEDITOR.tools.callFunction(' + mouseDownFn + ', event )">' +
				// BLACK LOWER RIGHT TRIANGLE (ltr)
				// BLACK LOWER LEFT TRIANGLE (rtl)
				( editor.lang.dir == 'ltr' ? '\u25E2' : '\u25E3' ) +
				'</div>' );
			dialog.parts.footer.append( resizer, 1 );
		} );
		editor.on( 'destroy', function() {
			CKEDITOR.tools.removeFunction( mouseDownFn );
		} );

		function mouseMoveHandler( evt ) {
			var rtl = editor.lang.dir == 'rtl',
				dx = ( evt.data.$.screenX - origin.x ) * ( rtl ? -1 : 1 ),
				dy = evt.data.$.screenY - origin.y,
				width = startSize.width,
				height = startSize.height,
				internalWidth = width + dx * ( dialog._.moved ? 1 : 2 ),
				internalHeight = height + dy * ( dialog._.moved ? 1 : 2 ),
				element = dialog._.element.getFirst(),
				right = rtl && element.getComputedStyle( 'right' ),
				position = dialog.getPosition();

			if ( position.y + internalHeight > viewSize.height )
				internalHeight = viewSize.height - position.y;

			if ( ( rtl ? right : position.x ) + internalWidth > viewSize.width )
				internalWidth = viewSize.width - ( rtl ? right : position.x );

			// Make sure the dialog will not be resized to the wrong side when it's in the leftmost position for RTL.
			if ( ( resizable == CKEDITOR.DIALOG_RESIZE_WIDTH || resizable == CKEDITOR.DIALOG_RESIZE_BOTH ) )
				width = Math.max( def.minWidth || 0, internalWidth - wrapperWidth );

			if ( resizable == CKEDITOR.DIALOG_RESIZE_HEIGHT || resizable == CKEDITOR.DIALOG_RESIZE_BOTH )
				height = Math.max( def.minHeight || 0, internalHeight - wrapperHeight );

			dialog.resize( width, height );

			if ( !dialog._.moved )
				dialog.layout();

			evt.data.preventDefault();
		}

		function mouseUpHandler() {
			CKEDITOR.document.removeListener( 'mouseup', mouseUpHandler );
			CKEDITOR.document.removeListener( 'mousemove', mouseMoveHandler );

			if ( dialogCover ) {
				dialogCover.remove();
				dialogCover = null;
			}

			if ( CKEDITOR.env.ie6Compat ) {
				var coverDoc = currentCover.getChild( 0 ).getFrameDocument();
				coverDoc.removeListener( 'mouseup', mouseUpHandler );
				coverDoc.removeListener( 'mousemove', mouseMoveHandler );
			}
		}
	}

	var resizeCover;
	// Caching resuable covers and allowing only one cover
	// on screen.
	var covers = {},
		currentCover;

	function cancelEvent( ev ) {
		ev.data.preventDefault( 1 );
	}

	function showCover( editor ) {
		var win = CKEDITOR.document.getWindow(),
			config = editor.config,
			skinName = ( CKEDITOR.skinName || editor.config.skin ),
			backgroundColorStyle = config.dialog_backgroundCoverColor || ( skinName == 'moono-lisa' ? 'black' : 'white' ),
			backgroundCoverOpacity = config.dialog_backgroundCoverOpacity,
			baseFloatZIndex = config.baseFloatZIndex,
			coverKey = CKEDITOR.tools.genKey( backgroundColorStyle, backgroundCoverOpacity, baseFloatZIndex ),
			coverElement = covers[ coverKey ];

		if ( !coverElement ) {
			var html = [
				'<div tabIndex="-1" style="position: ', ( CKEDITOR.env.ie6Compat ? 'absolute' : 'fixed' ),
				'; z-index: ', baseFloatZIndex,
				'; top: 0px; left: 0px; ',
				( !CKEDITOR.env.ie6Compat ? 'background-color: ' + backgroundColorStyle : '' ),
				'" class="cke_dialog_background_cover">'
			];

			if ( CKEDITOR.env.ie6Compat ) {
				// Support for custom document.domain in IE.
				var iframeHtml = '<html><body style=\\\'background-color:' + backgroundColorStyle + ';\\\'></body></html>';

				html.push( '<iframe' +
					' hidefocus="true"' +
					' frameborder="0"' +
					' id="cke_dialog_background_iframe"' +
					' src="javascript:' );

				html.push( 'void((function(){' + encodeURIComponent(
					'document.open();' +
					// Support for custom document.domain in IE.
					'(' + CKEDITOR.tools.fixDomain + ')();' +
					'document.write( \'' + iframeHtml + '\' );' +
					'document.close();'
				) + '})())' );

				html.push( '"' +
					' style="' +
						'position:absolute;' +
						'left:0;' +
						'top:0;' +
						'width:100%;' +
						'height: 100%;' +
						'filter: progid:DXImageTransform.Microsoft.Alpha(opacity=0)">' +
					'</iframe>' );
			}

			html.push( '</div>' );

			coverElement = CKEDITOR.dom.element.createFromHtml( html.join( '' ) );
			coverElement.setOpacity( backgroundCoverOpacity !== undefined ? backgroundCoverOpacity : 0.5 );

			coverElement.on( 'keydown', cancelEvent );
			coverElement.on( 'keypress', cancelEvent );
			coverElement.on( 'keyup', cancelEvent );

			coverElement.appendTo( CKEDITOR.document.getBody() );
			covers[ coverKey ] = coverElement;
		} else {
			coverElement.show();
		}

		// Makes the dialog cover a focus holder as well.
		editor.focusManager.add( coverElement );

		currentCover = coverElement;
		var resizeFunc = function() {
				var size = win.getViewPaneSize();
				coverElement.setStyles( {
					width: size.width + 'px',
					height: size.height + 'px'
				} );
			};

		var scrollFunc = function() {
				var pos = win.getScrollPosition(),
					cursor = CKEDITOR.dialog._.currentTop;
				coverElement.setStyles( {
					left: pos.x + 'px',
					top: pos.y + 'px'
				} );

				if ( cursor ) {
					do {
						var dialogPos = cursor.getPosition();
						cursor.move( dialogPos.x, dialogPos.y );
					} while ( ( cursor = cursor._.parentDialog ) );
				}
			};

		resizeCover = resizeFunc;
		win.on( 'resize', resizeFunc );
		resizeFunc();
		// Using Safari/Mac, focus must be kept where it is (https://dev.ckeditor.com/ticket/7027)
		if ( !( CKEDITOR.env.mac && CKEDITOR.env.webkit ) )
			coverElement.focus();

		if ( CKEDITOR.env.ie6Compat ) {
			// IE BUG: win.$.onscroll assignment doesn't work.. it must be window.onscroll.
			// So we need to invent a really funny way to make it work.
			var myScrollHandler = function() {
					scrollFunc();
					myScrollHandler.prevScrollHandler.apply( this, arguments );
				};
			win.$.setTimeout( function() {
				myScrollHandler.prevScrollHandler = window.onscroll ||
				function() {};
				window.onscroll = myScrollHandler;
			}, 0 );
			scrollFunc();
		}
	}

	function hideCover( editor ) {
		if ( !currentCover )
			return;

		editor.focusManager.remove( currentCover );
		var win = CKEDITOR.document.getWindow();
		currentCover.hide();

		// Remove the current cover reference once the cover is removed (#589).
		currentCover = null;
		win.removeListener( 'resize', resizeCover );

		if ( CKEDITOR.env.ie6Compat ) {
			win.$.setTimeout( function() {
				var prevScrollHandler = window.onscroll && window.onscroll.prevScrollHandler;
				window.onscroll = prevScrollHandler || null;
			}, 0 );
		}
		resizeCover = null;
	}

	function removeCovers() {
		for ( var coverId in covers )
			covers[ coverId ].remove();
		covers = {};
	}

	var accessKeyProcessors = {};

	var accessKeyDownHandler = function( evt ) {
			var ctrl = evt.data.$.ctrlKey || evt.data.$.metaKey,
				alt = evt.data.$.altKey,
				shift = evt.data.$.shiftKey,
				key = String.fromCharCode( evt.data.$.keyCode ),
				keyProcessor = accessKeyProcessors[ ( ctrl ? 'CTRL+' : '' ) + ( alt ? 'ALT+' : '' ) + ( shift ? 'SHIFT+' : '' ) + key ];

			if ( !keyProcessor || !keyProcessor.length )
				return;

			keyProcessor = keyProcessor[ keyProcessor.length - 1 ];
			keyProcessor.keydown && keyProcessor.keydown.call( keyProcessor.uiElement, keyProcessor.dialog, keyProcessor.key );
			evt.data.preventDefault();
		};

	var accessKeyUpHandler = function( evt ) {
			var ctrl = evt.data.$.ctrlKey || evt.data.$.metaKey,
				alt = evt.data.$.altKey,
				shift = evt.data.$.shiftKey,
				key = String.fromCharCode( evt.data.$.keyCode ),
				keyProcessor = accessKeyProcessors[ ( ctrl ? 'CTRL+' : '' ) + ( alt ? 'ALT+' : '' ) + ( shift ? 'SHIFT+' : '' ) + key ];

			if ( !keyProcessor || !keyProcessor.length )
				return;

			keyProcessor = keyProcessor[ keyProcessor.length - 1 ];
			if ( keyProcessor.keyup ) {
				keyProcessor.keyup.call( keyProcessor.uiElement, keyProcessor.dialog, keyProcessor.key );
				evt.data.preventDefault();
			}
		};

	var registerAccessKey = function( uiElement, dialog, key, downFunc, upFunc ) {
			var procList = accessKeyProcessors[ key ] || ( accessKeyProcessors[ key ] = [] );
			procList.push( {
				uiElement: uiElement,
				dialog: dialog,
				key: key,
				keyup: upFunc || uiElement.accessKeyUp,
				keydown: downFunc || uiElement.accessKeyDown
			} );
		};

	var unregisterAccessKey = function( obj ) {
			for ( var i in accessKeyProcessors ) {
				var list = accessKeyProcessors[ i ];
				for ( var j = list.length - 1; j >= 0; j-- ) {
					if ( list[ j ].dialog == obj || list[ j ].uiElement == obj )
						list.splice( j, 1 );
				}
				if ( list.length === 0 )
					delete accessKeyProcessors[ i ];
			}
		};

	var tabAccessKeyUp = function( dialog, key ) {
			if ( dialog._.accessKeyMap[ key ] )
				dialog.selectPage( dialog._.accessKeyMap[ key ] );
		};

	var tabAccessKeyDown = function() {};

	( function() {
		CKEDITOR.ui.dialog = {
			/**
			 * The base class of all dialog UI elements.
			 *
			 * @class CKEDITOR.ui.dialog.uiElement
			 * @constructor Creates a uiElement class instance.
			 * @param {CKEDITOR.dialog} dialog Parent dialog object.
			 * @param {CKEDITOR.dialog.definition.uiElement} elementDefinition Element
			 * definition.
			 *
			 * Accepted fields:
			 *
			 * * `id` (Required) The id of the UI element. See {@link CKEDITOR.dialog#getContentElement}.
			 * * `type` (Required) The type of the UI element. The
			 *     value to this field specifies which UI element class will be used to
			 *     generate the final widget.
			 * * `title` (Optional) The popup tooltip for the UI
			 *     element.
			 * * `hidden` (Optional) A flag that tells if the element
			 *     should be initially visible.
			 * * `className` (Optional) Additional CSS class names
			 *     to add to the UI element. Separated by space.
			 * * `style` (Optional) Additional CSS inline styles
			 *     to add to the UI element. A semicolon (;) is required after the last
			 *     style declaration.
			 * * `accessKey` (Optional) The alphanumeric access key
			 *     for this element. Access keys are automatically prefixed by CTRL.
			 * * `on*` (Optional) Any UI element definition field that
			 *     starts with `on` followed immediately by a capital letter and
			 *     probably more letters is an event handler. Event handlers may be further
			 *     divided into registered event handlers and DOM event handlers. Please
			 *     refer to {@link CKEDITOR.ui.dialog.uiElement#registerEvents} and
			 *     {@link CKEDITOR.ui.dialog.uiElement#eventProcessors} for more information.
			 *
			 * @param {Array} htmlList
			 * List of HTML code to be added to the dialog's content area.
			 * @param {Function/String} [nodeNameArg='div']
			 * A function returning a string, or a simple string for the node name for
			 * the root DOM node.
			 * @param {Function/Object} [stylesArg={}]
			 * A function returning an object, or a simple object for CSS styles applied
			 * to the DOM node.
			 * @param {Function/Object} [attributesArg={}]
			 * A fucntion returning an object, or a simple object for attributes applied
			 * to the DOM node.
			 * @param {Function/String} [contentsArg='']
			 * A function returning a string, or a simple string for the HTML code inside
			 * the root DOM node. Default is empty string.
			 */
			uiElement: function( dialog, elementDefinition, htmlList, nodeNameArg, stylesArg, attributesArg, contentsArg ) {
				if ( arguments.length < 4 )
					return;

				var nodeName = ( nodeNameArg.call ? nodeNameArg( elementDefinition ) : nodeNameArg ) || 'div',
					html = [ '<', nodeName, ' ' ],
					styles = ( stylesArg && stylesArg.call ? stylesArg( elementDefinition ) : stylesArg ) || {},
					attributes = ( attributesArg && attributesArg.call ? attributesArg( elementDefinition ) : attributesArg ) || {},
					innerHTML = ( contentsArg && contentsArg.call ? contentsArg.call( this, dialog, elementDefinition ) : contentsArg ) || '',
					domId = this.domId = attributes.id || CKEDITOR.tools.getNextId() + '_uiElement',
					i;

				if ( elementDefinition.requiredContent && !dialog.getParentEditor().filter.check( elementDefinition.requiredContent ) ) {
					styles.display = 'none';
					this.notAllowed = true;
				}

				// Set the id, a unique id is required for getElement() to work.
				attributes.id = domId;

				// Set the type and definition CSS class names.
				var classes = {};
				if ( elementDefinition.type )
					classes[ 'cke_dialog_ui_' + elementDefinition.type ] = 1;
				if ( elementDefinition.className )
					classes[ elementDefinition.className ] = 1;
				if ( elementDefinition.disabled )
					classes.cke_disabled = 1;

				var attributeClasses = ( attributes[ 'class' ] && attributes[ 'class' ].split ) ? attributes[ 'class' ].split( ' ' ) : [];
				for ( i = 0; i < attributeClasses.length; i++ ) {
					if ( attributeClasses[ i ] )
						classes[ attributeClasses[ i ] ] = 1;
				}
				var finalClasses = [];
				for ( i in classes )
					finalClasses.push( i );
				attributes[ 'class' ] = finalClasses.join( ' ' );

				// Set the popup tooltop.
				if ( elementDefinition.title )
					attributes.title = elementDefinition.title;

				// Write the inline CSS styles.
				var styleStr = ( elementDefinition.style || '' ).split( ';' );

				// Element alignment support.
				if ( elementDefinition.align ) {
					var align = elementDefinition.align;
					styles[ 'margin-left' ] = align == 'left' ? 0 : 'auto';
					styles[ 'margin-right' ] = align == 'right' ? 0 : 'auto';
				}

				for ( i in styles )
					styleStr.push( i + ':' + styles[ i ] );
				if ( elementDefinition.hidden )
					styleStr.push( 'display:none' );
				for ( i = styleStr.length - 1; i >= 0; i-- ) {
					if ( styleStr[ i ] === '' )
						styleStr.splice( i, 1 );
				}
				if ( styleStr.length > 0 )
					attributes.style = ( attributes.style ? ( attributes.style + '; ' ) : '' ) + styleStr.join( '; ' );

				// Write the attributes.
				for ( i in attributes )
					html.push( i + '="' + CKEDITOR.tools.htmlEncode( attributes[ i ] ) + '" ' );

				// Write the content HTML.
				html.push( '>', innerHTML, '</', nodeName, '>' );

				// Add contents to the parent HTML array.
				htmlList.push( html.join( '' ) );

				( this._ || ( this._ = {} ) ).dialog = dialog;

				// Override isChanged if it is defined in element definition.
				if ( typeof elementDefinition.isChanged == 'boolean' )
					this.isChanged = function() {
						return elementDefinition.isChanged;
					};
				if ( typeof elementDefinition.isChanged == 'function' )
					this.isChanged = elementDefinition.isChanged;

				// Overload 'get(set)Value' on definition.
				if ( typeof elementDefinition.setValue == 'function' ) {
					this.setValue = CKEDITOR.tools.override( this.setValue, function( org ) {
						return function( val ) {
							org.call( this, elementDefinition.setValue.call( this, val ) );
						};
					} );
				}

				if ( typeof elementDefinition.getValue == 'function' ) {
					this.getValue = CKEDITOR.tools.override( this.getValue, function( org ) {
						return function() {
							return elementDefinition.getValue.call( this, org.call( this ) );
						};
					} );
				}

				// Add events.
				CKEDITOR.event.implementOn( this );

				this.registerEvents( elementDefinition );
				if ( this.accessKeyUp && this.accessKeyDown && elementDefinition.accessKey )
					registerAccessKey( this, dialog, 'CTRL+' + elementDefinition.accessKey );

				var me = this;
				dialog.on( 'load', function() {
					var input = me.getInputElement();
					if ( input ) {
						var focusClass = me.type in { 'checkbox': 1, 'ratio': 1 } && CKEDITOR.env.ie && CKEDITOR.env.version < 8 ? 'cke_dialog_ui_focused' : '';
						input.on( 'focus', function() {
							dialog._.tabBarMode = false;
							dialog._.hasFocus = true;
							me.fire( 'focus' );
							focusClass && this.addClass( focusClass );

						} );

						input.on( 'blur', function() {
							me.fire( 'blur' );
							focusClass && this.removeClass( focusClass );
						} );
					}
				} );

				// Completes this object with everything we have in the
				// definition.
				CKEDITOR.tools.extend( this, elementDefinition );

				// Register the object as a tab focus if it can be included.
				if ( this.keyboardFocusable ) {
					this.tabIndex = elementDefinition.tabIndex || 0;

					this.focusIndex = dialog._.focusList.push( this ) - 1;
					this.on( 'focus', function() {
						dialog._.currentFocusIndex = me.focusIndex;
					} );
				}
			},

			/**
			 * Horizontal layout box for dialog UI elements, auto-expends to available width of container.
			 *
			 * @class CKEDITOR.ui.dialog.hbox
			 * @extends CKEDITOR.ui.dialog.uiElement
			 * @constructor Creates a hbox class instance.
			 * @param {CKEDITOR.dialog} dialog Parent dialog object.
			 * @param {Array} childObjList
			 * Array of {@link CKEDITOR.ui.dialog.uiElement} objects inside this container.
			 * @param {Array} childHtmlList
			 * Array of HTML code that correspond to the HTML output of all the
			 * objects in childObjList.
			 * @param {Array} htmlList
			 * Array of HTML code that this element will output to.
			 * @param {CKEDITOR.dialog.definition.uiElement} elementDefinition
			 * The element definition. Accepted fields:
			 *
			 * * `widths` (Optional) The widths of child cells.
			 * * `height` (Optional) The height of the layout.
			 * * `padding` (Optional) The padding width inside child cells.
			 * * `align` (Optional) The alignment of the whole layout.
			 */
			hbox: function( dialog, childObjList, childHtmlList, htmlList, elementDefinition ) {
				if ( arguments.length < 4 )
					return;

				this._ || ( this._ = {} );

				var children = this._.children = childObjList,
					widths = elementDefinition && elementDefinition.widths || null,
					height = elementDefinition && elementDefinition.height || null,
					styles = {},
					i;
				/** @ignore */
				var innerHTML = function() {
						var html = [ '<tbody><tr class="cke_dialog_ui_hbox">' ];
						for ( i = 0; i < childHtmlList.length; i++ ) {
							var className = 'cke_dialog_ui_hbox_child',
								styles = [];
							if ( i === 0 ) {
								className = 'cke_dialog_ui_hbox_first';
							}
							if ( i == childHtmlList.length - 1 ) {
								className = 'cke_dialog_ui_hbox_last';
							}

							html.push( '<td class="', className, '" role="presentation" ' );
							if ( widths ) {
								if ( widths[ i ] ) {
									styles.push( 'width:' + cssLength( widths[i] ) );
								}
							} else {
								styles.push( 'width:' + Math.floor( 100 / childHtmlList.length ) + '%' );
							}
							if ( height ) {
								styles.push( 'height:' + cssLength( height ) );
							}
							if ( elementDefinition && elementDefinition.padding !== undefined ) {
								styles.push( 'padding:' + cssLength( elementDefinition.padding ) );
							}
							// In IE Quirks alignment has to be done on table cells. (https://dev.ckeditor.com/ticket/7324)
							if ( CKEDITOR.env.ie && CKEDITOR.env.quirks && children[ i ].align ) {
								styles.push( 'text-align:' + children[ i ].align );
							}
							if ( styles.length > 0 ) {
								html.push( 'style="' + styles.join( '; ' ) + '" ' );
							}
							html.push( '>', childHtmlList[ i ], '</td>' );
						}
						html.push( '</tr></tbody>' );
						return html.join( '' );
					};

				var attribs = { role: 'presentation' };
				elementDefinition && elementDefinition.align && ( attribs.align = elementDefinition.align );

				CKEDITOR.ui.dialog.uiElement.call( this, dialog, elementDefinition || { type: 'hbox' }, htmlList, 'table', styles, attribs, innerHTML );
			},

			/**
			 * Vertical layout box for dialog UI elements.
			 *
			 * @class CKEDITOR.ui.dialog.vbox
			 * @extends CKEDITOR.ui.dialog.hbox
			 * @constructor Creates a vbox class instance.
			 * @param {CKEDITOR.dialog} dialog Parent dialog object.
			 * @param {Array} childObjList
			 * Array of {@link CKEDITOR.ui.dialog.uiElement} objects inside this container.
			 * @param {Array} childHtmlList
			 * Array of HTML code that correspond to the HTML output of all the
			 * objects in childObjList.
			 * @param {Array} htmlList Array of HTML code that this element will output to.
			 * @param {CKEDITOR.dialog.definition.uiElement} elementDefinition
			 * The element definition. Accepted fields:
			 *
			 * * `width` (Optional) The width of the layout.
			 * * `heights` (Optional) The heights of individual cells.
			 * * `align` (Optional) The alignment of the layout.
			 * * `padding` (Optional) The padding width inside child cells.
			 * * `expand` (Optional) Whether the layout should expand
			 *     vertically to fill its container.
			 */
			vbox: function( dialog, childObjList, childHtmlList, htmlList, elementDefinition ) {
				if ( arguments.length < 3 )
					return;

				this._ || ( this._ = {} );

				var children = this._.children = childObjList,
					width = elementDefinition && elementDefinition.width || null,
					heights = elementDefinition && elementDefinition.heights || null;
				/** @ignore */
				var innerHTML = function() {
						var html = [ '<table role="presentation" cellspacing="0" border="0" ' ];
						html.push( 'style="' );
						if ( elementDefinition && elementDefinition.expand )
							html.push( 'height:100%;' );
						html.push( 'width:' + cssLength( width || '100%' ), ';' );

						// (https://dev.ckeditor.com/ticket/10123) Temp fix for dialog broken layout in latest webkit.
						if ( CKEDITOR.env.webkit )
							html.push( 'float:none;' );

						html.push( '"' );
						html.push( 'align="', CKEDITOR.tools.htmlEncode(
						( elementDefinition && elementDefinition.align ) || ( dialog.getParentEditor().lang.dir == 'ltr' ? 'left' : 'right' ) ), '" ' );

						html.push( '><tbody>' );
						for ( var i = 0; i < childHtmlList.length; i++ ) {
							var styles = [];
							html.push( '<tr><td role="presentation" ' );
							if ( width )
								styles.push( 'width:' + cssLength( width || '100%' ) );
							if ( heights )
								styles.push( 'height:' + cssLength( heights[ i ] ) );
							else if ( elementDefinition && elementDefinition.expand )
								styles.push( 'height:' + Math.floor( 100 / childHtmlList.length ) + '%' );
							if ( elementDefinition && elementDefinition.padding !== undefined )
								styles.push( 'padding:' + cssLength( elementDefinition.padding ) );
							// In IE Quirks alignment has to be done on table cells. (https://dev.ckeditor.com/ticket/7324)
							if ( CKEDITOR.env.ie && CKEDITOR.env.quirks && children[ i ].align )
								styles.push( 'text-align:' + children[ i ].align );
							if ( styles.length > 0 )
								html.push( 'style="', styles.join( '; ' ), '" ' );
							html.push( ' class="cke_dialog_ui_vbox_child">', childHtmlList[ i ], '</td></tr>' );
						}
						html.push( '</tbody></table>' );
						return html.join( '' );
					};
				CKEDITOR.ui.dialog.uiElement.call( this, dialog, elementDefinition || { type: 'vbox' }, htmlList, 'div', null, { role: 'presentation' }, innerHTML );
			}
		};
	} )();

	/** @class CKEDITOR.ui.dialog.uiElement */
	CKEDITOR.ui.dialog.uiElement.prototype = {
		/**
		 * Gets the root DOM element of this dialog UI object.
		 *
		 *		uiElement.getElement().hide();
		 *
		 * @returns {CKEDITOR.dom.element} Root DOM element of UI object.
		 */
		getElement: function() {
			return CKEDITOR.document.getById( this.domId );
		},

		/**
		 * Gets the DOM element that the user inputs values.
		 *
		 * This function is used by {@link #setValue}, {@link #getValue} and {@link #focus}. It should
		 * be overrided in child classes where the input element isn't the root
		 * element.
		 *
		 *		var rawValue = textInput.getInputElement().$.value;
		 *
		 * @returns {CKEDITOR.dom.element} The element where the user input values.
		 */
		getInputElement: function() {
			return this.getElement();
		},

		/**
		 * Gets the parent dialog object containing this UI element.
		 *
		 *		var dialog = uiElement.getDialog();
		 *
		 * @returns {CKEDITOR.dialog} Parent dialog object.
		 */
		getDialog: function() {
			return this._.dialog;
		},

		/**
		 * Sets the value of this dialog UI object.
		 *
		 *		uiElement.setValue( 'Dingo' );
		 *
		 * @chainable
		 * @param {Object} value The new value.
		 * @param {Boolean} noChangeEvent Internal commit, to supress `change` event on this element.
		 */
		setValue: function( value, noChangeEvent ) {
			this.getInputElement().setValue( value );
			!noChangeEvent && this.fire( 'change', { value: value } );
			return this;
		},

		/**
		 * Gets the current value of this dialog UI object.
		 *
		 *		var myValue = uiElement.getValue();
		 *
		 * @returns {Object} The current value.
		 */
		getValue: function() {
			return this.getInputElement().getValue();
		},

		/**
		 * Tells whether the UI object's value has changed.
		 *
		 *		if ( uiElement.isChanged() )
		 *			confirm( 'Value changed! Continue?' );
		 *
		 * @returns {Boolean} `true` if changed, `false` if not changed.
		 */
		isChanged: function() {
			// Override in input classes.
			return false;
		},

		/**
		 * Selects the parent tab of this element. Usually called by focus() or overridden focus() methods.
		 *
		 *		focus : function() {
		 *			this.selectParentTab();
		 *			// do something else.
		 *		}
		 *
		 * @chainable
		 */
		selectParentTab: function() {
			var element = this.getInputElement(),
				cursor = element,
				tabId;
			while ( ( cursor = cursor.getParent() ) && cursor.$.className.search( 'cke_dialog_page_contents' ) == -1 ) {

			}

			// Some widgets don't have parent tabs (e.g. OK and Cancel buttons).
			if ( !cursor )
				return this;

			tabId = cursor.getAttribute( 'name' );
			// Avoid duplicate select.
			if ( this._.dialog._.currentTabId != tabId )
				this._.dialog.selectPage( tabId );
			return this;
		},

		/**
		 * Puts the focus to the UI object. Switches tabs if the UI object isn't in the active tab page.
		 *
		 *		uiElement.focus();
		 *
		 * @chainable
		 */
		focus: function() {
			this.selectParentTab().getInputElement().focus();
			return this;
		},

		/**
		 * Registers the `on*` event handlers defined in the element definition.
		 *
		 * The default behavior of this function is:
		 *
		 * 1. If the on* event is defined in the class's eventProcesors list,
		 *     then the registration is delegated to the corresponding function
		 *     in the eventProcessors list.
		 * 2. If the on* event is not defined in the eventProcessors list, then
		 *     register the event handler under the corresponding DOM event of
		 *     the UI element's input DOM element (as defined by the return value
		 *     of {@link #getInputElement}).
		 *
		 * This function is only called at UI element instantiation, but can
		 * be overridded in child classes if they require more flexibility.
		 *
		 * @chainable
		 * @param {CKEDITOR.dialog.definition.uiElement} definition The UI element
		 * definition.
		 */
		registerEvents: function( definition ) {
			var regex = /^on([A-Z]\w+)/,
				match;

			var registerDomEvent = function( uiElement, dialog, eventName, func ) {
					dialog.on( 'load', function() {
						uiElement.getInputElement().on( eventName, func, uiElement );
					} );
				};

			for ( var i in definition ) {
				if ( !( match = i.match( regex ) ) )
					continue;
				if ( this.eventProcessors[ i ] )
					this.eventProcessors[ i ].call( this, this._.dialog, definition[ i ] );
				else
					registerDomEvent( this, this._.dialog, match[ 1 ].toLowerCase(), definition[ i ] );
			}

			return this;
		},

		/**
		 * The event processor list used by
		 * {@link CKEDITOR.ui.dialog.uiElement#getInputElement} at UI element
		 * instantiation. The default list defines three `on*` events:
		 *
		 * 1. `onLoad` - Called when the element's parent dialog opens for the
		 *     first time.
		 * 2. `onShow` - Called whenever the element's parent dialog opens.
		 * 3. `onHide` - Called whenever the element's parent dialog closes.
		 *
		 *		// This connects the 'click' event in CKEDITOR.ui.dialog.button to onClick
		 *		// handlers in the UI element's definitions.
		 *		CKEDITOR.ui.dialog.button.eventProcessors = CKEDITOR.tools.extend( {},
		 *			CKEDITOR.ui.dialog.uiElement.prototype.eventProcessors,
		 *			{ onClick : function( dialog, func ) { this.on( 'click', func ); } },
		 *			true
		 *		);
		 *
		 * @property {Object}
		 */
		eventProcessors: {
			onLoad: function( dialog, func ) {
				dialog.on( 'load', func, this );
			},

			onShow: function( dialog, func ) {
				dialog.on( 'show', func, this );
			},

			onHide: function( dialog, func ) {
				dialog.on( 'hide', func, this );
			}
		},

		/**
		 * The default handler for a UI element's access key down event, which
		 * tries to put focus to the UI element.
		 *
		 * Can be overridded in child classes for more sophisticaed behavior.
		 *
		 * @param {CKEDITOR.dialog} dialog The parent dialog object.
		 * @param {String} key The key combination pressed. Since access keys
		 * are defined to always include the `CTRL` key, its value should always
		 * include a `'CTRL+'` prefix.
		 */
		accessKeyDown: function() {
			this.focus();
		},

		/**
		 * The default handler for a UI element's access key up event, which
		 * does nothing.
		 *
		 * Can be overridded in child classes for more sophisticated behavior.
		 *
		 * @param {CKEDITOR.dialog} dialog The parent dialog object.
		 * @param {String} key The key combination pressed. Since access keys
		 * are defined to always include the `CTRL` key, its value should always
		 * include a `'CTRL+'` prefix.
		 */
		accessKeyUp: function() {},

		/**
		 * Disables a UI element.
		 */
		disable: function() {
			var element = this.getElement(),
				input = this.getInputElement();
			input.setAttribute( 'disabled', 'true' );
			element.addClass( 'cke_disabled' );
		},

		/**
		 * Enables a UI element.
		 */
		enable: function() {
			var element = this.getElement(),
				input = this.getInputElement();
			input.removeAttribute( 'disabled' );
			element.removeClass( 'cke_disabled' );
		},

		/**
		 * Determines whether an UI element is enabled or not.
		 *
		 * @returns {Boolean} Whether the UI element is enabled.
		 */
		isEnabled: function() {
			return !this.getElement().hasClass( 'cke_disabled' );
		},

		/**
		 * Determines whether an UI element is visible or not.
		 *
		 * @returns {Boolean} Whether the UI element is visible.
		 */
		isVisible: function() {
			return this.getInputElement().isVisible();
		},

		/**
		 * Determines whether an UI element is focus-able or not.
		 * Focus-able is defined as being both visible and enabled.
		 *
		 * @returns {Boolean} Whether the UI element can be focused.
		 */
		isFocusable: function() {
			if ( !this.isEnabled() || !this.isVisible() )
				return false;
			return true;
		}
	};

	/** @class CKEDITOR.ui.dialog.hbox */
	CKEDITOR.ui.dialog.hbox.prototype = CKEDITOR.tools.extend( new CKEDITOR.ui.dialog.uiElement(), {
		/**
		 * Gets a child UI element inside this container.
		 *
		 *		var checkbox = hbox.getChild( [0,1] );
		 *		checkbox.setValue( true );
		 *
		 * @param {Array/Number} indices An array or a single number to indicate the child's
		 * position in the container's descendant tree. Omit to get all the children in an array.
		 * @returns {Array/CKEDITOR.ui.dialog.uiElement} Array of all UI elements in the container
		 * if no argument given, or the specified UI element if indices is given.
		 */
		getChild: function( indices ) {
			// If no arguments, return a clone of the children array.
			if ( arguments.length < 1 )
				return this._.children.concat();

			// If indices isn't array, make it one.
			if ( !indices.splice )
				indices = [ indices ];

			// Retrieve the child element according to tree position.
			if ( indices.length < 2 )
				return this._.children[ indices[ 0 ] ];
			else
				return ( this._.children[ indices[ 0 ] ] && this._.children[ indices[ 0 ] ].getChild ) ? this._.children[ indices[ 0 ] ].getChild( indices.slice( 1, indices.length ) ) : null;
		}
	}, true );

	CKEDITOR.ui.dialog.vbox.prototype = new CKEDITOR.ui.dialog.hbox();

	( function() {
		var commonBuilder = {
			build: function( dialog, elementDefinition, output ) {
				var children = elementDefinition.children,
					child,
					childHtmlList = [],
					childObjList = [];
				for ( var i = 0;
				( i < children.length && ( child = children[ i ] ) ); i++ ) {
					var childHtml = [];
					childHtmlList.push( childHtml );
					childObjList.push( CKEDITOR.dialog._.uiElementBuilders[ child.type ].build( dialog, child, childHtml ) );
				}
				return new CKEDITOR.ui.dialog[ elementDefinition.type ]( dialog, childObjList, childHtmlList, output, elementDefinition );
			}
		};

		CKEDITOR.dialog.addUIElement( 'hbox', commonBuilder );
		CKEDITOR.dialog.addUIElement( 'vbox', commonBuilder );
	} )();

	/**
	 * Generic dialog command. It opens a specific dialog when executed.
	 *
	 *		// Register the "link" command which opens the "link" dialog.
	 *		editor.addCommand( 'link', new CKEDITOR.dialogCommand( 'link' ) );
	 *
	 * @class
	 * @constructor Creates a dialogCommand class instance.
	 * @extends CKEDITOR.commandDefinition
	 * @param {String} dialogName The name of the dialog to open when executing
	 * this command.
	 * @param {Object} [ext] Additional command definition's properties.
	 * @param {String} [ext.tabId] You can provide additional property (`tabId`) if you wish to open the dialog on a specific tabId.
	 *
	 *		// Open the dialog on the 'keystroke' tabId.
	 *		editor.addCommand( 'keystroke', new CKEDITOR.dialogCommand( 'a11yHelp', { tabId: 'keystroke' } ) );
	 */
	CKEDITOR.dialogCommand = function( dialogName, ext ) {
		this.dialogName = dialogName;
		CKEDITOR.tools.extend( this, ext, true );
	};

	CKEDITOR.dialogCommand.prototype = {
		exec: function( editor ) {
			var tabId = this.tabId;
			editor.openDialog( this.dialogName, function( dialog ) {
				// Select different tab if it's provided (#830).
				if ( tabId ) {
					dialog.selectPage( tabId );
				}
			} );
		},

		// Dialog commands just open a dialog ui, thus require no undo logic,
		// undo support should dedicate to specific dialog implementation.
		canUndo: false,

		editorFocus: 1
	};

	( function() {
		var notEmptyRegex = /^([a]|[^a])+$/,
			integerRegex = /^\d*$/,
			numberRegex = /^\d*(?:\.\d+)?$/,
			htmlLengthRegex = /^(((\d*(\.\d+))|(\d*))(px|\%)?)?$/,
			cssLengthRegex = /^(((\d*(\.\d+))|(\d*))(px|em|ex|in|cm|mm|pt|pc|\%)?)?$/i,
			inlineStyleRegex = /^(\s*[\w-]+\s*:\s*[^:;]+(?:;|$))*$/;

		/**
		 * {@link CKEDITOR.dialog Dialog} `OR` logical value indicates the
		 * relation between validation functions.
		 *
		 * @readonly
		 * @property {Number} [=1]
		 * @member CKEDITOR
		 */
		CKEDITOR.VALIDATE_OR = 1;

		/**
		 * {@link CKEDITOR.dialog Dialog} `AND` logical value indicates the
		 * relation between validation functions.
		 *
		 * @readonly
		 * @property {Number} [=2]
		 * @member CKEDITOR
		 */
		CKEDITOR.VALIDATE_AND = 2;

		/**
		 * The namespace with dialog helper validation functions.
		 *
		 * @class
		 * @singleton
		 */
		CKEDITOR.dialog.validate = {
			/**
			 * Performs validation functions composition.
			 *
			 * ```javascript
			 * CKEDITOR.dialog.validate.functions(
			 * 	CKEDITOR.dialog.validate.notEmpty( 'Value is required.' ),
			 * 	CKEDITOR.dialog.validate.number( 'Value is not a number.' ),
			 * 	'error!'
			 * );
			 * ```
			 *
			 * @param {Function...} validators Validation functions which will be composed into a single validator.
			 * @param {String} [msg] Error message returned by the composed validation function.
			 * @param {Number} [relation=CKEDITOR.VALIDATE_OR] Indicates a relation between validation functions.
			 * Use {@link CKEDITOR#VALIDATE_OR} or {@link CKEDITOR#VALIDATE_AND}.
			 *
			 * @returns {Function} Composed validation function.
			 */
			functions: function() {
				var args = arguments;
				return function() {
					// It's important for validate functions to be able to accept the value
					// as argument in addition to this.getValue(), so that it is possible to
					// combine validate functions together to make more sophisticated
					// validators.
					var value = this && this.getValue ? this.getValue() : args[ 0 ];

					var msg,
						relation = CKEDITOR.VALIDATE_AND,
						functions = [],
						i;

					for ( i = 0; i < args.length; i++ ) {
						if ( typeof args[ i ] == 'function' )
							functions.push( args[ i ] );
						else
							break;
					}

					if ( i < args.length && typeof args[ i ] == 'string' ) {
						msg = args[ i ];
						i++;
					}

					if ( i < args.length && typeof args[ i ] == 'number' )
						relation = args[ i ];

					var passed = ( relation == CKEDITOR.VALIDATE_AND ? true : false );
					for ( i = 0; i < functions.length; i++ ) {
						if ( relation == CKEDITOR.VALIDATE_AND )
							passed = passed && functions[ i ]( value );
						else
							passed = passed || functions[ i ]( value );
					}

					return !passed ? msg : true;
				};
			},

			/**
			 * Checks if a dialog UI element value meets the regex condition.
			 *
			 * ```javascript
			 * CKEDITOR.dialog.validate.regex( 'error!', /^\d*$/ )( '123' ) // true
			 * CKEDITOR.dialog.validate.regex( 'error!' )( '123.321' ) // error!
			 * ```
			 *
			 * @param {RegExp} regex Regular expression used to validate the value.
			 * @param {String} msg Validator error message.
			 * @returns {Function} Validation function.
			 */
			regex: function( regex, msg ) {
				/*
				 * Can be greatly shortened by deriving from functions validator if code size
				 * turns out to be more important than performance.
				 */
				return function() {
					var value = this && this.getValue ? this.getValue() : arguments[ 0 ];
					return !regex.test( value ) ? msg : true;
				};
			},

			/**
			 * Checks if a dialog UI element value is not an empty string.
			 *
			 * ```javascript
			 * CKEDITOR.dialog.validate.notEmpty( 'error!' )( 'test' ) // true
			 * CKEDITOR.dialog.validate.notEmpty( 'error!' )( '  ' ) // error!
			 * ```
			 *
			 * @param {String} msg Validator error message.
			 * @returns {Function} Validation function.
			 */
			notEmpty: function( msg ) {
				return this.regex( notEmptyRegex, msg );
			},

			/**
			 * Checks if a dialog UI element value is an Integer.
			 *
			 * ```javascript
			 * CKEDITOR.dialog.validate.integer( 'error!' )( '123' ) // true
			 * CKEDITOR.dialog.validate.integer( 'error!' )( '123.321' ) // error!
			 * ```
			 *
			 * @param {String} msg Validator error message.
			 * @returns {Function} Validation function.
			 */
			integer: function( msg ) {
				return this.regex( integerRegex, msg );
			},

			/**
			 * Checks if a dialog UI element value is a Number.
			 *
			 * ```javascript
			 * CKEDITOR.dialog.validate.number( 'error!' )( '123' ) // true
			 * CKEDITOR.dialog.validate.number( 'error!' )( 'test' ) // error!
			 * ```
			 *
			 * @param {String} msg Validator error message.
			 * @returns {Function} Validation function.
			 */
			'number': function( msg ) {
				return this.regex( numberRegex, msg );
			},

			/**
			 * Checks if a dialog UI element value is a correct CSS length value.
			 *
			 * It allows `px`, `em`, `ex`, `in`, `cm`, `mm`, `pt`, `pc` units.
			 *
			 * ```javascript
			 * CKEDITOR.dialog.validate.cssLength( 'error!' )( '10pt' ) // true
			 * CKEDITOR.dialog.validate.cssLength( 'error!' )( 'solid' ) // error!
			 * ```
			 *
			 * @param {String} msg Validator error message.
			 * @returns {Function} Validation function.
			 */
			'cssLength': function( msg ) {
				return this.functions( function( val ) {
					return cssLengthRegex.test( CKEDITOR.tools.trim( val ) );
				}, msg );
			},

			/**
			 * Checks if a dialog UI element value is a correct HTML length value.
			 *
			 * It allows `px` units.
			 *
			 * ```javascript
			 * CKEDITOR.dialog.validate.htmlLength( 'error!' )( '10px' ) // true
			 * CKEDITOR.dialog.validate.htmlLength( 'error!' )( 'solid' ) // error!
			 * ```
			 *
			 * @param {String} msg Validator error message.
			 * @returns {Function} Validation function.
			 */
			'htmlLength': function( msg ) {
				return this.functions( function( val ) {
					return htmlLengthRegex.test( CKEDITOR.tools.trim( val ) );
				}, msg );
			},

			/**
			 * Checks if a dialog UI element value is a correct CSS inline style.
			 *
			 * ```javascript
			 * CKEDITOR.dialog.validate.inlineStyle( 'error!' )( 'height: 10px; width: 20px;' ) // true
			 * CKEDITOR.dialog.validate.inlineStyle( 'error!' )( 'test' ) // error!
			 * ```
			 *
			 * @param {String} msg Validator error message.
			 * @returns {Function} Validation function.
			 */
			'inlineStyle': function( msg ) {
				return this.functions( function( val ) {
					return inlineStyleRegex.test( CKEDITOR.tools.trim( val ) );
				}, msg );
			},

			/**
			 * Checks if a dialog UI element value and the given value are equal.
			 *
			 * ```javascript
			 * CKEDITOR.dialog.validate.equals( 'foo', 'error!' )( 'foo' ) // true
			 * CKEDITOR.dialog.validate.equals( 'foo', 'error!' )( 'baz' ) // error!
			 * ```
			 *
			 * @param {String} value The value to compare.
			 * @param {String} msg Validator error message.
			 * @returns {Function} Validation function.
			 */
			equals: function( value, msg ) {
				return this.functions( function( val ) {
					return val == value;
				}, msg );
			},

			/**
			 * Checks if a dialog UI element value and the given value are not equal.
			 *
			 * ```javascript
			 * CKEDITOR.dialog.validate.notEqual( 'foo', 'error!' )( 'baz' ) // true
			 * CKEDITOR.dialog.validate.notEqual( 'foo', 'error!' )( 'foo' ) // error!
			 * ```
			 *
			 * @param {String} value The value to compare.
			 * @param {String} msg Validator error message.
			 * @returns {Function} Validation function.
			 */
			notEqual: function( value, msg ) {
				return this.functions( function( val ) {
					return val != value;
				}, msg );
			}
		};

		CKEDITOR.on( 'instanceDestroyed', function( evt ) {
			// Remove dialog cover on last instance destroy.
			if ( CKEDITOR.tools.isEmpty( CKEDITOR.instances ) ) {
				var currentTopDialog;
				while ( ( currentTopDialog = CKEDITOR.dialog._.currentTop ) )
					currentTopDialog.hide();
				removeCovers();
			}

			var dialogs = evt.editor._.storedDialogs;
			for ( var name in dialogs )
				dialogs[ name ].destroy();

		} );

	} )();

	// Extend the CKEDITOR.editor class with dialog specific functions.
	CKEDITOR.tools.extend( CKEDITOR.editor.prototype, {
		/**
		 * Loads and opens a registered dialog.
		 *
		 *		CKEDITOR.instances.editor1.openDialog( 'smiley' );
		 *
		 * @member CKEDITOR.editor
		 * @param {String} dialogName The registered name of the dialog.
		 * @param {Function} callback The function to be invoked after dialog instance created.
		 * @returns {CKEDITOR.dialog} The dialog object corresponding to the dialog displayed.
		 * `null` if the dialog name is not registered.
		 * @see CKEDITOR.dialog#add
		 */
		openDialog: function( dialogName, callback ) {
			var dialog = null, dialogDefinitions = CKEDITOR.dialog._.dialogDefinitions[ dialogName ];

			if ( CKEDITOR.dialog._.currentTop === null )
				showCover( this );

			// If the dialogDefinition is already loaded, open it immediately.
			if ( typeof dialogDefinitions == 'function' ) {
				var storedDialogs = this._.storedDialogs || ( this._.storedDialogs = {} );

				dialog = storedDialogs[ dialogName ] || ( storedDialogs[ dialogName ] = new CKEDITOR.dialog( this, dialogName ) );

				callback && callback.call( dialog, dialog );
				dialog.show();

			} else if ( dialogDefinitions == 'failed' ) {
				hideCover( this );
				throw new Error( '[CKEDITOR.dialog.openDialog] Dialog "' + dialogName + '" failed when loading definition.' );
			} else if ( typeof dialogDefinitions == 'string' ) {

				CKEDITOR.scriptLoader.load( CKEDITOR.getUrl( dialogDefinitions ),
					function() {
						var dialogDefinition = CKEDITOR.dialog._.dialogDefinitions[ dialogName ];
						// In case of plugin error, mark it as loading failed.
						if ( typeof dialogDefinition != 'function' )
							CKEDITOR.dialog._.dialogDefinitions[ dialogName ] = 'failed';

						this.openDialog( dialogName, callback );
					}, this, 0, 1 );
			}

			CKEDITOR.skin.loadPart( 'dialog' );

			return dialog;
		}
	} );
} )();

CKEDITOR.plugins.add( 'dialog', {
	requires: 'dialogui',
	init: function( editor ) {
		editor.on( 'doubleclick', function( evt ) {
			if ( evt.data.dialog )
				editor.openDialog( evt.data.dialog );
		}, null, null, 999 );
	}
} );

// Dialog related configurations.

/**
 * The color of the dialog background cover. It should be a valid CSS color string.
 *
 *		config.dialog_backgroundCoverColor = 'rgb(255, 254, 253)';
 *
 * @cfg {String} [dialog_backgroundCoverColor='white']
 * @member CKEDITOR.config
 */

/**
 * The opacity of the dialog background cover. It should be a number within the
 * range `[0.0, 1.0]`.
 *
 *		config.dialog_backgroundCoverOpacity = 0.7;
 *
 * @cfg {Number} [dialog_backgroundCoverOpacity=0.5]
 * @member CKEDITOR.config
 */

/**
 * If the dialog has more than one tab, put focus into the first tab as soon as dialog is opened.
 *
 *		config.dialog_startupFocusTab = true;
 *
 * @cfg {Boolean} [dialog_startupFocusTab=false]
 * @member CKEDITOR.config
 */

/**
 * The distance of magnetic borders used in moving and resizing dialogs,
 * measured in pixels.
 *
 *		config.dialog_magnetDistance = 30;
 *
 * @cfg {Number} [dialog_magnetDistance=20]
 * @member CKEDITOR.config
 */

/**
 * The guideline to follow when generating the dialog buttons. There are 3 possible options:
 *
 * * `'OS'` - the buttons will be displayed in the default order of the user's OS;
 * * `'ltr'` - for Left-To-Right order;
 * * `'rtl'` - for Right-To-Left order.
 *
 * Example:
 *
 *		config.dialog_buttonsOrder = 'rtl';
 *
 * @since 3.5.0
 * @cfg {String} [dialog_buttonsOrder='OS']
 * @member CKEDITOR.config
 */

/**
 * The dialog contents to removed. It's a string composed by dialog name and tab name with a colon between them.
 *
 * Separate each pair with semicolon (see example).
 *
 * **Note:** All names are case-sensitive.
 *
 * **Note:** Be cautious when specifying dialog tabs that are mandatory,
 * like `'info'`, dialog functionality might be broken because of this!
 *
 *		config.removeDialogTabs = 'flash:advanced;image:Link';
 *
 * @since 3.5.0
 * @cfg {String} [removeDialogTabs='']
 * @member CKEDITOR.config
 */

/**
 * Tells if user should not be asked to confirm close, if any dialog field was modified.
 * By default it is set to `false` meaning that the confirmation dialog will be shown.
 *
 *		config.dialog_noConfirmCancel = true;
 *
 * @since 4.3.0
 * @cfg {Boolean} [dialog_noConfirmCancel=false]
 * @member CKEDITOR.config
 */

/**
 * Event fired when a dialog definition is about to be used to create a dialog into
 * an editor instance. This event makes it possible to customize the definition
 * before creating it.
 *
 * Note that this event is called only the first time a specific dialog is
 * opened. Successive openings will use the cached dialog, and this event will
 * not get fired.
 *
 * @event dialogDefinition
 * @member CKEDITOR
 * @param {CKEDITOR.dialog.definition} data The dialog defination that
 * is being loaded.
 * @param {CKEDITOR.editor} editor The editor instance that will use the dialog.
 */

/**
 * Event fired when a tab is going to be selected in a dialog.
 *
 * @event selectPage
 * @member CKEDITOR.dialog
 * @param data
 * @param {String} data.page The id of the page that it's gonna be selected.
 * @param {String} data.currentPage The id of the current page.
 */

/**
 * Event fired when the user tries to dismiss a dialog.
 *
 * @event cancel
 * @member CKEDITOR.dialog
 * @param data
 * @param {Boolean} data.hide Whether the event should proceed or not.
 */

/**
 * Event fired when the user tries to confirm a dialog.
 *
 * @event ok
 * @member CKEDITOR.dialog
 * @param data
 * @param {Boolean} data.hide Whether the event should proceed or not.
 */

/**
 * Event fired when a dialog is shown.
 *
 * @event show
 * @member CKEDITOR.dialog
 */

/**
 * Event fired when a dialog is shown.
 *
 * @event dialogShow
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param {CKEDITOR.dialog} data The opened dialog instance.
 */

/**
 * Event fired when a dialog is hidden.
 *
 * @event hide
 * @member CKEDITOR.dialog
 */

/**
 * Event fired when a dialog is hidden.
 *
 * @event dialogHide
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param {CKEDITOR.dialog} data The hidden dialog instance.
 */

/**
 * Event fired when a dialog is being resized. The event is fired on
 * both the {@link CKEDITOR.dialog} object and the dialog instance
 * since 3.5.3, previously it was only available in the global object.
 *
 * @static
 * @event resize
 * @member CKEDITOR.dialog
 * @param data
 * @param {CKEDITOR.dialog} data.dialog The dialog being resized (if
 * it is fired on the dialog itself, this parameter is not sent).
 * @param {String} data.skin The skin name.
 * @param {Number} data.width The new width.
 * @param {Number} data.height The new height.
 */

/**
 * Event fired when a dialog is being resized. The event is fired on
 * both the {@link CKEDITOR.dialog} object and the dialog instance
 * since 3.5.3, previously it was only available in the global object.
 *
 * @since 3.5.0
 * @event resize
 * @member CKEDITOR.dialog
 * @param data
 * @param {Number} data.width The new width.
 * @param {Number} data.height The new height.
 */

/**
 * Event fired when the dialog state changes, usually by {@link CKEDITOR.dialog#setState}.
 *
 * @since 4.5.0
 * @event state
 * @member CKEDITOR.dialog
 * @param data
 * @param {Number} data The new state. Either {@link CKEDITOR#DIALOG_STATE_IDLE} or {@link CKEDITOR#DIALOG_STATE_BUSY}.
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Plugin definition for the a11yhelp, which provides a dialog
 * with accessibility related help.
 */

( function() {
	var pluginName = 'a11yhelp',
		commandName = 'a11yHelp';

	CKEDITOR.plugins.add( pluginName, {
		requires: 'dialog',

		// List of available localizations.
		// jscs:disable
		availableLangs: { af:1,ar:1,az:1,bg:1,ca:1,cs:1,cy:1,da:1,de:1,'de-ch':1,el:1,en:1,'en-au':1,'en-gb':1,eo:1,es:1,'es-mx':1,et:1,eu:1,fa:1,fi:1,fo:1,fr:1,'fr-ca':1,gl:1,gu:1,he:1,hi:1,hr:1,hu:1,id:1,it:1,ja:1,km:1,ko:1,ku:1,lt:1,lv:1,mk:1,mn:1,nb:1,nl:1,no:1,oc:1,pl:1,pt:1,'pt-br':1,ro:1,ru:1,si:1,sk:1,sl:1,sq:1,sr:1,'sr-latn':1,sv:1,th:1,tr:1,tt:1,ug:1,uk:1,vi:1,zh:1,'zh-cn':1 },
		// jscs:enable

		init: function( editor ) {
			var plugin = this;
			editor.addCommand( commandName, {
				exec: function() {
					var langCode = editor.langCode;
					langCode =
						plugin.availableLangs[ langCode ] ? langCode :
						plugin.availableLangs[ langCode.replace( /-.*/, '' ) ] ? langCode.replace( /-.*/, '' ) :
						'en';

					CKEDITOR.scriptLoader.load( CKEDITOR.getUrl( plugin.path + 'dialogs/lang/' + langCode + '.js' ), function() {
						editor.lang.a11yhelp = plugin.langEntries[ langCode ];
						editor.openDialog( commandName );
					} );
				},
				modes: { wysiwyg: 1, source: 1 },
				readOnly: 1,
				canUndo: false
			} );

			editor.setKeystroke( CKEDITOR.ALT + 48 /*0*/, 'a11yHelp' );
			CKEDITOR.dialog.add( commandName, this.path + 'dialogs/a11yhelp.js' );

			editor.on( 'ariaEditorHelpLabel', function( evt ) {
				evt.data.label = editor.lang.common.editorHelp;
			} );
		}
	} );
} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

CKEDITOR.plugins.add( 'about', {
	requires: 'dialog',
	// jscs:disable maximumLineLength
	// jscs:enable maximumLineLength
	init: function( editor ) {
		var command = editor.addCommand( 'about', new CKEDITOR.dialogCommand( 'about' ) );
		command.modes = { wysiwyg: 1, source: 1 };
		command.canUndo = false;
		command.readOnly = 1;

		editor.ui.addButton && editor.ui.addButton( 'About', {
			label: editor.lang.about.dlgTitle,
			command: 'about',
			toolbar: 'about'
		} );

		CKEDITOR.dialog.add( 'about', this.path + 'dialogs/about.js' );
	}
} );

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

CKEDITOR.plugins.add( 'basicstyles', {
	// jscs:disable maximumLineLength
	// jscs:enable maximumLineLength
	init: function( editor ) {
		var order = 0;
		// All buttons use the same code to register. So, to avoid
		// duplications, let's use this tool function.
		var addButtonCommand = function( buttonName, buttonLabel, commandName, styleDefiniton ) {
				// Disable the command if no definition is configured.
				if ( !styleDefiniton )
					return;

				var style = new CKEDITOR.style( styleDefiniton ),
					forms = contentForms[ commandName ];

				// Put the style as the most important form.
				forms.unshift( style );

				// Listen to contextual style activation.
				editor.attachStyleStateChange( style, function( state ) {
					!editor.readOnly && editor.getCommand( commandName ).setState( state );
				} );

				// Create the command that can be used to apply the style.
				editor.addCommand( commandName, new CKEDITOR.styleCommand( style, {
					contentForms: forms
				} ) );

				// Register the button, if the button plugin is loaded.
				if ( editor.ui.addButton ) {
					editor.ui.addButton( buttonName, {
						label: buttonLabel,
						command: commandName,
						toolbar: 'basicstyles,' + ( order += 10 )
					} );
				}
			};

		var contentForms = {
				bold: [
					'strong',
					'b',
					[ 'span', function( el ) {
						var fw = el.styles[ 'font-weight' ];
						return fw == 'bold' || +fw >= 700;
					} ]
				],

				italic: [
					'em',
					'i',
					[ 'span', function( el ) {
						return el.styles[ 'font-style' ] == 'italic';
					} ]
				],

				underline: [
					'u',
					[ 'span', function( el ) {
						return el.styles[ 'text-decoration' ] == 'underline';
					} ]
				],

				strike: [
					's',
					'strike',
					[ 'span', function( el ) {
						return el.styles[ 'text-decoration' ] == 'line-through';
					} ]
				],

				subscript: [
					'sub'
				],

				superscript: [
					'sup'
				]
			},
			config = editor.config,
			lang = editor.lang.basicstyles;

		addButtonCommand( 'Bold', lang.bold, 'bold', config.coreStyles_bold );
		addButtonCommand( 'Italic', lang.italic, 'italic', config.coreStyles_italic );
		addButtonCommand( 'Underline', lang.underline, 'underline', config.coreStyles_underline );
		addButtonCommand( 'Strike', lang.strike, 'strike', config.coreStyles_strike );
		addButtonCommand( 'Subscript', lang.subscript, 'subscript', config.coreStyles_subscript );
		addButtonCommand( 'Superscript', lang.superscript, 'superscript', config.coreStyles_superscript );

		editor.setKeystroke( [
			[ CKEDITOR.CTRL + 66 /*B*/, 'bold' ],
			[ CKEDITOR.CTRL + 73 /*I*/, 'italic' ],
			[ CKEDITOR.CTRL + 85 /*U*/, 'underline' ]
		] );
	}
} );

// Basic Inline Styles.

/**
 * The style definition that applies the **bold** style to the text.
 *
 * Read more in the {@glink features/basicstyles documentation}
 * and see the {@glink examples/basicstyles example}.
 *
 *		config.coreStyles_bold = { element: 'b', overrides: 'strong' };
 *
 *		config.coreStyles_bold = {
 *			element: 'span',
 *			attributes: { 'class': 'Bold' }
 *		};
 *
 * @cfg
 * @member CKEDITOR.config
 */
CKEDITOR.config.coreStyles_bold = { element: 'strong', overrides: 'b' };

/**
 * The style definition that applies the *italics* style to the text.
 *
 * Read more in the {@glink features/basicstyles documentation}
 * and see the {@glink examples/basicstyles example}.
 *
 *		config.coreStyles_italic = { element: 'i', overrides: 'em' };
 *
 *		CKEDITOR.config.coreStyles_italic = {
 *			element: 'span',
 *			attributes: { 'class': 'Italic' }
 *		};
 *
 * @cfg
 * @member CKEDITOR.config
 */
CKEDITOR.config.coreStyles_italic = { element: 'em', overrides: 'i' };

/**
 * The style definition that applies the <u>underline</u> style to the text.
 *
 * Read more in the {@glink features/basicstyles documentation}
 * and see the {@glink examples/basicstyles example}.
 *
 *		CKEDITOR.config.coreStyles_underline = {
 *			element: 'span',
 *			attributes: { 'class': 'Underline' }
 *		};
 *
 * @cfg
 * @member CKEDITOR.config
 */
CKEDITOR.config.coreStyles_underline = { element: 'u' };

/**
 * The style definition that applies the <strike>strikethrough</strike> style to the text.
 *
 * Read more in the {@glink features/basicstyles documentation}
 * and see the {@glink examples/basicstyles example}.
 *
 *		CKEDITOR.config.coreStyles_strike = {
 *			element: 'span',
 *			attributes: { 'class': 'Strikethrough' },
 *			overrides: 'strike'
 *		};
 *
 * @cfg
 * @member CKEDITOR.config
 */
CKEDITOR.config.coreStyles_strike = { element: 's', overrides: 'strike' };

/**
 * The style definition that applies the subscript style to the text.
 *
 * Read more in the {@glink features/basicstyles documentation}
 * and see the {@glink examples/basicstyles example}.
 *
 *		CKEDITOR.config.coreStyles_subscript = {
 *			element: 'span',
 *			attributes: { 'class': 'Subscript' },
 *			overrides: 'sub'
 *		};
 *
 * @cfg
 * @member CKEDITOR.config
 */
CKEDITOR.config.coreStyles_subscript = { element: 'sub' };

/**
 * The style definition that applies the superscript style to the text.
 *
 * Read more in the {@glink features/basicstyles documentation}
 * and see the {@glink examples/basicstyles example}.
 *
 *		CKEDITOR.config.coreStyles_superscript = {
 *			element: 'span',
 *			attributes: { 'class': 'Superscript' },
 *			overrides: 'sup'
 *		};
 *
 * @cfg
 * @member CKEDITOR.config
 */
CKEDITOR.config.coreStyles_superscript = { element: 'sup' };

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

( function() {
	function noBlockLeft( bqBlock ) {
		for ( var i = 0, length = bqBlock.getChildCount(), child; i < length && ( child = bqBlock.getChild( i ) ); i++ ) {
			if ( child.type == CKEDITOR.NODE_ELEMENT && child.isBlockBoundary() )
				return false;
		}
		return true;
	}

	var commandObject = {
		exec: function( editor ) {
			var state = editor.getCommand( 'blockquote' ).state,
				selection = editor.getSelection(),
				range = selection && selection.getRanges()[ 0 ];

			if ( !range )
				return;

			var bookmarks = selection.createBookmarks();

			// Kludge for https://dev.ckeditor.com/ticket/1592: if the bookmark nodes are in the beginning of
			// blockquote, then move them to the nearest block element in the
			// blockquote.
			if ( CKEDITOR.env.ie ) {
				var bookmarkStart = bookmarks[ 0 ].startNode,
					bookmarkEnd = bookmarks[ 0 ].endNode,
					cursor;

				if ( bookmarkStart && bookmarkStart.getParent().getName() == 'blockquote' ) {
					cursor = bookmarkStart;
					while ( ( cursor = cursor.getNext() ) ) {
						if ( cursor.type == CKEDITOR.NODE_ELEMENT && cursor.isBlockBoundary() ) {
							bookmarkStart.move( cursor, true );
							break;
						}
					}
				}

				if ( bookmarkEnd && bookmarkEnd.getParent().getName() == 'blockquote' ) {
					cursor = bookmarkEnd;
					while ( ( cursor = cursor.getPrevious() ) ) {
						if ( cursor.type == CKEDITOR.NODE_ELEMENT && cursor.isBlockBoundary() ) {
							bookmarkEnd.move( cursor );
							break;
						}
					}
				}
			}

			var iterator = range.createIterator(),
				block;
			iterator.enlargeBr = editor.config.enterMode != CKEDITOR.ENTER_BR;

			if ( state == CKEDITOR.TRISTATE_OFF ) {
				var paragraphs = [];
				while ( ( block = iterator.getNextParagraph() ) )
					paragraphs.push( block );

				// If no paragraphs, create one from the current selection position.
				if ( paragraphs.length < 1 ) {
					var para = editor.document.createElement( editor.config.enterMode == CKEDITOR.ENTER_P ? 'p' : 'div' ),
						firstBookmark = bookmarks.shift();
					range.insertNode( para );
					para.append( new CKEDITOR.dom.text( '\ufeff', editor.document ) );
					range.moveToBookmark( firstBookmark );
					range.selectNodeContents( para );
					range.collapse( true );
					firstBookmark = range.createBookmark();
					paragraphs.push( para );
					bookmarks.unshift( firstBookmark );
				}

				// Make sure all paragraphs have the same parent.
				var commonParent = paragraphs[ 0 ].getParent(),
					tmp = [];
				for ( var i = 0; i < paragraphs.length; i++ ) {
					block = paragraphs[ i ];
					commonParent = commonParent.getCommonAncestor( block.getParent() );
				}

				// The common parent must not be the following tags: table, tbody, tr, ol, ul.
				var denyTags = { table: 1, tbody: 1, tr: 1, ol: 1, ul: 1 };
				while ( denyTags[ commonParent.getName() ] )
					commonParent = commonParent.getParent();

				// Reconstruct the block list to be processed such that all resulting blocks
				// satisfy parentNode.equals( commonParent ).
				var lastBlock = null;
				while ( paragraphs.length > 0 ) {
					block = paragraphs.shift();
					while ( !block.getParent().equals( commonParent ) )
						block = block.getParent();
					if ( !block.equals( lastBlock ) )
						tmp.push( block );
					lastBlock = block;
				}

				// If any of the selected blocks is a blockquote, remove it to prevent
				// nested blockquotes.
				while ( tmp.length > 0 ) {
					block = tmp.shift();
					if ( block.getName() == 'blockquote' ) {
						var docFrag = new CKEDITOR.dom.documentFragment( editor.document );
						while ( block.getFirst() ) {
							docFrag.append( block.getFirst().remove() );
							paragraphs.push( docFrag.getLast() );
						}

						docFrag.replace( block );
					} else {
						paragraphs.push( block );
					}
				}

				// Now we have all the blocks to be included in a new blockquote node.
				var bqBlock = editor.document.createElement( 'blockquote' );
				bqBlock.insertBefore( paragraphs[ 0 ] );
				while ( paragraphs.length > 0 ) {
					block = paragraphs.shift();
					bqBlock.append( block );
				}
			} else if ( state == CKEDITOR.TRISTATE_ON ) {
				var moveOutNodes = [],
					database = {};

				while ( ( block = iterator.getNextParagraph() ) ) {
					var bqParent = null,
						bqChild = null;
					while ( block.getParent() ) {
						if ( block.getParent().getName() == 'blockquote' ) {
							bqParent = block.getParent();
							bqChild = block;
							break;
						}
						block = block.getParent();
					}

					// Remember the blocks that were recorded down in the moveOutNodes array
					// to prevent duplicates.
					if ( bqParent && bqChild && !bqChild.getCustomData( 'blockquote_moveout' ) ) {
						moveOutNodes.push( bqChild );
						CKEDITOR.dom.element.setMarker( database, bqChild, 'blockquote_moveout', true );
					}
				}

				CKEDITOR.dom.element.clearAllMarkers( database );

				var movedNodes = [],
					processedBlockquoteBlocks = [];

				database = {};
				while ( moveOutNodes.length > 0 ) {
					var node = moveOutNodes.shift();
					bqBlock = node.getParent();

					// If the node is located at the beginning or the end, just take it out
					// without splitting. Otherwise, split the blockquote node and move the
					// paragraph in between the two blockquote nodes.
					if ( !node.getPrevious() )
						node.remove().insertBefore( bqBlock );
					else if ( !node.getNext() )
						node.remove().insertAfter( bqBlock );
					else {
						node.breakParent( node.getParent() );
						processedBlockquoteBlocks.push( node.getNext() );
					}

					// Remember the blockquote node so we can clear it later (if it becomes empty).
					if ( !bqBlock.getCustomData( 'blockquote_processed' ) ) {
						processedBlockquoteBlocks.push( bqBlock );
						CKEDITOR.dom.element.setMarker( database, bqBlock, 'blockquote_processed', true );
					}

					movedNodes.push( node );
				}

				CKEDITOR.dom.element.clearAllMarkers( database );

				// Clear blockquote nodes that have become empty.
				for ( i = processedBlockquoteBlocks.length - 1; i >= 0; i-- ) {
					bqBlock = processedBlockquoteBlocks[ i ];
					if ( noBlockLeft( bqBlock ) )
						bqBlock.remove();
				}

				if ( editor.config.enterMode == CKEDITOR.ENTER_BR ) {
					var firstTime = true;
					while ( movedNodes.length ) {
						node = movedNodes.shift();

						if ( node.getName() == 'div' ) {
							docFrag = new CKEDITOR.dom.documentFragment( editor.document );
							var needBeginBr = firstTime && node.getPrevious() && !( node.getPrevious().type == CKEDITOR.NODE_ELEMENT && node.getPrevious().isBlockBoundary() );
							if ( needBeginBr )
								docFrag.append( editor.document.createElement( 'br' ) );

							var needEndBr = node.getNext() && !( node.getNext().type == CKEDITOR.NODE_ELEMENT && node.getNext().isBlockBoundary() );
							while ( node.getFirst() )
								node.getFirst().remove().appendTo( docFrag );

							if ( needEndBr )
								docFrag.append( editor.document.createElement( 'br' ) );

							docFrag.replace( node );
							firstTime = false;
						}
					}
				}
			}

			selection.selectBookmarks( bookmarks );
			editor.focus();
		},

		refresh: function( editor, path ) {
			// Check if inside of blockquote.
			var firstBlock = path.block || path.blockLimit;
			this.setState( editor.elementPath( firstBlock ).contains( 'blockquote', 1 ) ? CKEDITOR.TRISTATE_ON : CKEDITOR.TRISTATE_OFF );
		},

		context: 'blockquote',

		allowedContent: 'blockquote',
		requiredContent: 'blockquote'
	};

	CKEDITOR.plugins.add( 'blockquote', {
		// jscs:disable maximumLineLength
		// jscs:enable maximumLineLength
		init: function( editor ) {
			if ( editor.blockless )
				return;

			editor.addCommand( 'blockquote', commandObject );

			editor.ui.addButton && editor.ui.addButton( 'Blockquote', {
				label: editor.lang.blockquote.toolbar,
				command: 'blockquote',
				toolbar: 'blocks,10'
			} );
		}
	} );
} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview The "Notification" plugin.
 *
 */

'use strict';

( function() {

	CKEDITOR.plugins.add( 'notification', {

		init: function( editor ) {
			editor._.notificationArea = new Area( editor );

			// Overwrites default `editor.showNotification`.
			editor.showNotification = function( message, type, progressOrDuration ) {
				var progress, duration;

				if ( type == 'progress' ) {
					progress = progressOrDuration;
				} else {
					duration = progressOrDuration;
				}

				var notification = new CKEDITOR.plugins.notification( editor, {
					message: message,
					type: type,
					progress: progress,
					duration: duration
				} );

				notification.show();

				return notification;
			};

			// Close the last notification on ESC.
			editor.on( 'key', function( evt ) {
				if ( evt.data.keyCode == 27 ) { /* ESC */
					var notifications = editor._.notificationArea.notifications;

					if ( !notifications.length ) {
						return;
					}

					// As long as this is not a common practice to inform screen-reader users about actions, in this case
					// this is the best solution (unfortunately there is no standard for accessibility for notifications).
					// Notification has an `alert` aria role what means that it does not get a focus nor is needed to be
					// closed (unlike `alertdialog`). However notification will capture ESC key so we need to inform user
					// why it does not do other actions.
					say( editor.lang.notification.closed );

					// Hide last.
					notifications[ notifications.length - 1 ].hide();

					evt.cancel();
				}
			} );

			// Send the message to the screen readers.
			function say( text ) {
				var message = new CKEDITOR.dom.element( 'div' );
				message.setStyles( {
					position: 'fixed',
					'margin-left': '-9999px'
				} );
				message.setAttributes( {
					'aria-live': 'assertive',
					'aria-atomic': 'true'
				} );
				message.setText( text );

				CKEDITOR.document.getBody().append( message );

				setTimeout( function() {
					message.remove();
				}, 100 );
			}
		}
	} );

	/**
	 * Notification class. Notifications are used to display short messages to the user. They might be used to show the result of
	 * asynchronous actions or information about changes in the editor content. It is recommended to use them instead of
	 * alert dialogs. They should **not** be used if a user response is required nor with dialog windows (e.g. in dialog validation).
	 *
	 * There are four types of notifications available, see the {@link #type} property.
	 *
	 * Note that the notification constructor only creates a notification instance. To show it, use the {@link #show} method:
	 *
	 *		var notification = new CKEDITOR.plugins.notification( editor, { message: 'Foo' } );
	 *		notification.show();
	 *
	 * You can also use the {@link CKEDITOR.editor#showNotification} method:
	 *
	 *		editor.showNotification( 'Foo' );
	 *
	 * All of the notification actions: ({@link #show}, {@link #update} and {@link #hide}) fire cancelable events
	 * on the related {@link CKEDITOR.editor} instance so you can integrate editor notifications with your website notifications.
	 *
	 * Refer to the [Notifications](https://ckeditor.com/docs/ckeditor4/latest/guide/dev_notifications.html) article for more information about this feature.
	 *
	 * @since 4.5.0
	 * @class CKEDITOR.plugins.notification
	 * @constructor Create a notification object. Call {@link #show} to show the created notification.
	 * @param {CKEDITOR.editor} editor The editor instance.
	 * @param {Object} options
	 * @param {String} options.message The message displayed in the notification.
	 * @param {String} [options.type='info'] Notification type, see {@link #type}.
	 * @param {Number} [options.progress=0] If the type is `progress` this may be a progress from 0 to 1.
	 * @param {Number} [options.duration] How long the notification will be visible, see {@link #duration}.
	 */
	function Notification( editor, options ) {
		CKEDITOR.tools.extend( this, options, {
			editor: editor,
			id: 'cke-' + CKEDITOR.tools.getUniqueId(),
			area: editor._.notificationArea
		} );

		if ( !options.type ) {
			this.type = 'info';
		}

		this.element = this._createElement();

		// Don't allow dragging on notification (https://dev.ckeditor.com/ticket/13184).
		editor.plugins.clipboard && CKEDITOR.plugins.clipboard.preventDefaultDropOnElement( this.element );
	}

	/**
	 * The editor instance.
	 *
	 * @readonly
	 * @property {CKEDITOR.editor} editor
	 */

	/**
	 * Message displayed in the notification.
	 *
	 * @readonly
	 * @property {String} message
	 */

	/**
	 * Notification type. There are four types available:
	 *
	 * * `info` (default) &ndash; Information for the user (e.g. "File is uploading.", "ACF modified content."),
	 * * `warning` &ndash; Warning or error message (e.g. "This type of file is not supported.",
	 * "You cannot paste the script."),
	 * * `success` &ndash; Information that an operation finished successfully (e.g. "File uploaded.", "Data imported.").
	 * * `progress` &ndash; Information about the progress of an operation. When the operation is done, the notification
	 * type should be changed to `success`.
	 *
	 * @readonly
	 * @property {String} type
	 */

	/**
	 * If the notification {@link #type} is `'progress'`, this is the progress from `0` to `1`.
	 *
	 * @readonly
	 * @property {Number} progress
	 */

	/**
	 * Notification duration. Determines after how many milliseconds the notification should close automatically.
	 * `0` means that the notification will not close automatically and that the user needs to close it manually.
	 * The default value for `warning` and `progress` notifications is `0`. For `info` and `success` the value can
	 * either be set through the {@link CKEDITOR.config#notification_duration} configuration option or equals `5000`
	 * if the configuration option is not set.
	 *
	 * @readonly
	 * @property {Number} duration
	 */

	/**
	 * Unique notification ID.
	 *
	 * @readonly
	 * @property {Number} id
	 */

	/**
	 * Notification DOM element. There is one element per notification. It is created when the notification is created,
	 * even if it is not shown. If the notification is hidden, the element is detached from the document but not deleted.
	 * It will be reused if the notification is shown again.
	 *
	 * @readonly
	 * @property {CKEDITOR.dom.element} element
	 */

	/**
	 * {@link CKEDITOR.plugins.notification.area Notification area} reference.
	 *
	 * @readonly
	 * @property {CKEDITOR.plugins.notification.area} area
	 */

	Notification.prototype = {
		/**
		 * Adds the notification element to the notification area. The notification will be hidden automatically if
		 * {@link #duration} is set.
		 *
		 * Fires the {@link CKEDITOR.editor#notificationShow} event.
		 */
		show: function() {
			if ( this.editor.fire( 'notificationShow', { notification: this } ) === false ) {
				return;
			}

			this.area.add( this );

			this._hideAfterTimeout();
		},

		/**
		 * Updates the notification object and element.
		 *
		 * Fires the {@link CKEDITOR.editor#notificationUpdate} event.
		 *
		 * @param {Object} options
		 * @param {String} [options.message] {@link #message}
		 * @param {String} [options.type] {@link #type}
		 * @param {Number} [options.progress] {@link #progress}
		 * @param {Number} [options.duration] {@link #duration}
		 * @param {Boolean} [options.important=false] If the update is important, the notification will be shown
		 * if it was hidden and read by screen readers.
		 */
		update: function( options ) {
			var show = true;

			if ( this.editor.fire( 'notificationUpdate', { notification: this, options: options } ) === false ) {
				// The idea of cancelable event is to let user create his own way of displaying notification, so if
				// `notificationUpdate` event will be canceled there will be no interaction with notification area, but on
				// the other hand the logic should work anyway so object will be updated (including `element` property).
				// Note: we can safely update the element's attributes below, because this element is created inside
				// the constructor. If the notificatinShow event was canceled as well, the element is detached from DOM.
				show = false;
			}

			var element = this.element,
				messageElement = element.findOne( '.cke_notification_message' ),
				progressElement = element.findOne( '.cke_notification_progress' ),
				type = options.type;

			element.removeAttribute( 'role' );

			// Change type to progress if `options.progress` is set.
			if ( options.progress && this.type != 'progress' ) {
				type = 'progress';
			}

			if ( type ) {
				element.removeClass( this._getClass() );
				element.removeAttribute( 'aria-label' );

				this.type = type;

				element.addClass( this._getClass() );
				element.setAttribute( 'aria-label', this.type );

				if ( this.type == 'progress' && !progressElement ) {
					progressElement = this._createProgressElement();
					progressElement.insertBefore( messageElement );
				} else if ( this.type != 'progress' && progressElement ) {
					progressElement.remove();
				}
			}

			if ( options.message !== undefined ) {
				this.message = options.message;
				messageElement.setHtml( this.message );
			}

			if ( options.progress !== undefined ) {
				this.progress = options.progress;

				if ( progressElement ) {
					progressElement.setStyle( 'width', this._getPercentageProgress() );
				}
			}

			if ( show && options.important ) {
				element.setAttribute( 'role', 'alert' );

				if ( !this.isVisible() ) {
					this.area.add( this );
				}
			}

			// Overwrite even if it is undefined.
			this.duration = options.duration;

			this._hideAfterTimeout();
		},

		/**
		 * Removes the notification element from the notification area.
		 *
		 * Fires the {@link CKEDITOR.editor#notificationHide} event.
		 */
		hide: function() {
			if ( this.editor.fire( 'notificationHide', { notification: this } ) === false ) {
				return;
			}

			this.area.remove( this );
		},

		/**
		 * Returns `true` if the notification is in the notification area.
		 *
		 * @returns {Boolean} `true` if the notification is in the notification area.
		 */
		isVisible: function() {
			return CKEDITOR.tools.indexOf( this.area.notifications, this ) >= 0;
		},

		/**
		 * Creates the notification DOM element.
		 *
		 * @private
		 * @returns {CKEDITOR.dom.element} Notification DOM element.
		 */
		_createElement: function() {
			var notification = this,
				notificationElement, notificationMessageElement, notificationCloseElement,
				close = this.editor.lang.common.close;

			notificationElement = new CKEDITOR.dom.element( 'div' );
			notificationElement.addClass( 'cke_notification' );
			notificationElement.addClass( this._getClass() );
			notificationElement.setAttributes( {
				id: this.id,
				role: 'alert',
				'aria-label': this.type
			} );

			if ( this.type == 'progress' )
				notificationElement.append( this._createProgressElement() );

			notificationMessageElement = new CKEDITOR.dom.element( 'p' );
			notificationMessageElement.addClass( 'cke_notification_message' );
			notificationMessageElement.setHtml( this.message );
			notificationElement.append( notificationMessageElement );

			notificationCloseElement = CKEDITOR.dom.element.createFromHtml(
				'<a class="cke_notification_close" href="javascript:void(0)" title="' + close + '" role="button" tabindex="-1">' +
					'<span class="cke_label">X</span>' +
				'</a>' );
			notificationElement.append( notificationCloseElement );

			notificationCloseElement.on( 'click', function() {
				// Focus editor on close (https://dev.ckeditor.com/ticket/12865)
				notification.editor.focus();

				notification.hide();
			} );

			return notificationElement;
		},

		/**
		 * Gets the notification CSS class.
		 *
		 * @private
		 * @returns {String} Notification CSS class.
		 */
		_getClass: function() {
			return ( this.type == 'progress' ) ?
				'cke_notification_info' :
				( 'cke_notification_' + this.type );
		},

		/**
		 * Creates a progress element for the notification element.
		 *
		 * @private
		 * @returns {CKEDITOR.dom.element} Progress element for the notification element.
		 */
		_createProgressElement: function() {
			var element = new CKEDITOR.dom.element( 'span' );
			element.addClass( 'cke_notification_progress' );
			element.setStyle( 'width', this._getPercentageProgress() );
			return element;
		},

		/**
		 * Gets the progress as a percentage (ex. `0.3` -> `30%`).
		 *
		 * @private
		 * @returns {String} Progress as a percentage.
		 */
		_getPercentageProgress: function() {
			return Math.round( ( this.progress || 0 ) * 100 ) + '%';
		},

		/**
		 * Hides the notification after a timeout.
		 *
		 * @private
		 */
		_hideAfterTimeout: function() {
			var notification = this,
				duration;

			if ( this._hideTimeoutId ) {
				clearTimeout( this._hideTimeoutId );
			}

			if ( typeof this.duration == 'number' ) {
				duration = this.duration;
			} else if ( this.type == 'info' || this.type == 'success' ) {
				duration = ( typeof this.editor.config.notification_duration == 'number' ) ?
					this.editor.config.notification_duration :
					5000;
			}

			if ( duration ) {
				notification._hideTimeoutId = setTimeout( function() {
					notification.hide();
				}, duration );
			}
		}
	};

	/**
	 * Notification area is an area where all notifications are put. The area is laid out dynamically.
	 * When the first notification is added, the area is shown and all listeners are added.
	 * When the last notification is removed, the area is hidden and all listeners are removed.
	 *
	 * @since 4.5.0
	 * @private
	 * @class CKEDITOR.plugins.notification.area
	 * @constructor
	 * @param {CKEDITOR.editor} editor The editor instance.
	 */
	function Area( editor ) {
		var that = this;

		this.editor = editor;
		this.notifications = [];
		this.element = this._createElement();
		this._uiBuffer = CKEDITOR.tools.eventsBuffer( 10, this._layout, this );
		this._changeBuffer = CKEDITOR.tools.eventsBuffer( 500, this._layout, this );

		editor.on( 'destroy', function() {
			that._removeListeners();
			that.element.remove();
		} );
	}

	/**
	 * The editor instance.
	 *
	 * @readonly
	 * @property {CKEDITOR.editor} editor
	 */

	/**
	 * The array of added notifications.
	 *
	 * @readonly
	 * @property {Array} notifications
	 */

	/**
	 * Notification area DOM element. This element is created when the area object is created. It will be attached to the document
	 * when the first notification is added and removed when the last notification is removed.
	 *
	 * @readonly
	 * @property {CKEDITOR.dom.element} element
	 */

	/**
	 * Notification width. Cached for performance reasons.
	 *
	 * @private
	 * @property {CKEDITOR.dom.element} _notificationWidth
	 */

	/**
	 * Notification margin. Cached for performance reasons.
	 *
	 * @private
	 * @property {CKEDITOR.dom.element} _notificationMargin
	 */

	/**
	 * Event buffer object for UI events to optimize performance.
	 *
	 * @private
	 * @property {Object} _uiBuffer
	 */

	/**
	 * Event buffer object for editor change events to optimize performance.
	 *
	 * @private
	 * @property {Object} _changeBuffer
	 */

	Area.prototype = {
		/**
		 * Adds the notification to the notification area. If it is the first notification, the area will also be attached to
		 * the document and listeners will be attached.
		 *
		 * Note that the proper way to show a notification is to call the {@link CKEDITOR.plugins.notification#show} method.
		 *
		 * @param {CKEDITOR.plugins.notification} notification Notification to add.
		 */
		add: function( notification ) {
			this.notifications.push( notification );

			this.element.append( notification.element );

			if ( this.element.getChildCount() == 1 ) {
				CKEDITOR.document.getBody().append( this.element );
				this._attachListeners();
			}

			this._layout();
		},

		/**
		 * Removes the notification from the notification area. If it is the last notification, the area will also be
		 * detached from the document and listeners will be detached.
		 *
		 * Note that the proper way to hide a notification is to call the {@link CKEDITOR.plugins.notification#hide} method.
		 *
		 * @param {CKEDITOR.plugins.notification} notification Notification to remove.
		 */
		remove: function( notification ) {
			var i = CKEDITOR.tools.indexOf( this.notifications, notification );

			if ( i < 0 ) {
				return;
			}

			this.notifications.splice( i, 1 );

			notification.element.remove();

			if ( !this.element.getChildCount() ) {
				this._removeListeners();
				this.element.remove();
			}
		},

		/**
		 * Creates the notification area element.
		 *
		 * @private
		 * @returns {CKEDITOR.dom.element} Notification area element.
		 */
		_createElement: function() {
			var editor = this.editor,
				config = editor.config,
				notificationArea = new CKEDITOR.dom.element( 'div' );

			notificationArea.addClass( 'cke_notifications_area' );
			notificationArea.setAttribute( 'id', 'cke_notifications_area_' + editor.name );
			notificationArea.setStyle( 'z-index', config.baseFloatZIndex - 2 );

			return notificationArea;
		},

		/**
		 * Attaches listeners to the notification area.
		 *
		 * @private
		 */
		_attachListeners: function() {
			var win = CKEDITOR.document.getWindow(),
				editor = this.editor;

			win.on( 'scroll', this._uiBuffer.input );
			win.on( 'resize', this._uiBuffer.input );
			editor.on( 'change', this._changeBuffer.input );
			editor.on( 'floatingSpaceLayout', this._layout, this, null, 20 );
			editor.on( 'blur', this._layout, this, null, 20 );
		},

		/**
		 * Detaches listeners from the notification area.
		 *
		 * @private
		 */
		_removeListeners: function() {
			var win = CKEDITOR.document.getWindow(),
				editor = this.editor;

			win.removeListener( 'scroll', this._uiBuffer.input );
			win.removeListener( 'resize', this._uiBuffer.input );
			editor.removeListener( 'change', this._changeBuffer.input );
			editor.removeListener( 'floatingSpaceLayout', this._layout );
			editor.removeListener( 'blur', this._layout );
		},

		/**
		 * Sets the position of the notification area based on the editor content, toolbar as well as
		 * viewport position and dimensions.
		 *
		 * @private
		 */
		_layout: function() {
			var area = this.element,
				editor = this.editor,
				contentsRect = editor.ui.contentsElement.getClientRect(),
				contentsPos = editor.ui.contentsElement.getDocumentPosition(),
				top,
				topRect,
				areaRect = area.getClientRect(),
				notification,
				notificationWidth = this._notificationWidth,
				notificationMargin = this._notificationMargin,
				win = CKEDITOR.document.getWindow(),
				scrollPos = win.getScrollPosition(),
				viewRect = win.getViewPaneSize(),
				body = CKEDITOR.document.getBody(),
				bodyPos = body.getDocumentPosition(),
				cssLength = CKEDITOR.tools.cssLength;

			// Cache for optimization
			if ( !notificationWidth || !notificationMargin ) {
				notification = this.element.getChild( 0 );
				notificationWidth = this._notificationWidth = notification.getClientRect().width;
				notificationMargin = this._notificationMargin =
					parseInt( notification.getComputedStyle( 'margin-left' ), 10 ) +
					parseInt( notification.getComputedStyle( 'margin-right' ), 10 );
			}

			// Check if toolbar exist and if so, then assign values to it (#491).
			if ( editor.toolbar ) {
				top = editor.ui.space( 'top' );
				topRect = top.getClientRect();
			}


			// --------------------------------------- Horizontal layout ----------------------------------------

			// +---Viewport-------------------------------+          +---Viewport-------------------------------+
			// |                                          |          |                                          |
			// | +---Toolbar----------------------------+ |          | +---Content----------------------------+ |
			// | |                                      | |          | |                                      | |
			// | +---Content----------------------------+ |          | |                                      | |
			// | |                                      | |          | +---Toolbar----------------------+     | |
			// | |      +------Notification------+      | |          | |                                |     | |
			// | |                                      | |    OR    | +--------------------------------+     | |
			// | |                                      | |          | |                                      | |
			// | |                                      | |          | |      +------Notification------+      | |
			// | |                                      | |          | |                                      | |
			// | |                                      | |          | |                                      | |
			// | +--------------------------------------+ |          | +--------------------------------------+ |
			// +------------------------------------------+          +------------------------------------------+
			if ( top && top.isVisible() &&
				topRect.bottom > contentsRect.top &&
				topRect.bottom < contentsRect.bottom - areaRect.height ) {
				setBelowToolbar();

			// +---Viewport-------------------------------+
			// |                                          |
			// | +---Content----------------------------+ |
			// | |                                      | |
			// | |      +------Notification------+      | |
			// | |                                      | |
			// | |                                      | |
			// | |                                      | |
			// | +--------------------------------------+ |
			// |                                          |
			// +------------------------------------------+
			} else if ( contentsRect.top > 0 ) {
				setTopStandard();

			//   +---Content----------------------------+
			//   |                                      |
			// +---Viewport-------------------------------+
			// | |                                      | |
			// | |      +------Notification------+      | |
			// | |                                      | |
			// | |                                      | |
			// | |                                      | |
			// | +--------------------------------------+ |
			// |                                          |
			// +------------------------------------------+
			} else if ( contentsPos.y + contentsRect.height - areaRect.height > scrollPos.y ) {
				setTopFixed();

			//   +---Content----------------------------+              +---Content----------------------------+
			//   |                                      |              |                                      |
			//   |                                      |              |                                      |
			//   |                                      |              |      +------Notification------+      |
			//   |                                      |              |                                      |
			//   |                                      |      OR      +--------------------------------------+
			// +---Viewport-------------------------------+
			// | |      +------Notification------+      | |          +---Viewport-------------------------------+
			// | |                                      | |          |                                          |
			// | +--------------------------------------+ |          |                                          |
			// |                                          |          |                                          |
			// +------------------------------------------+          +------------------------------------------+
			} else {
				setBottom();
			}

			function setTopStandard() {
				area.setStyles( {
					position: 'absolute',
					top: cssLength( contentsPos.y )
				} );
			}

			function setBelowToolbar() {
				area.setStyles( {
					position: 'fixed',
					top: cssLength( topRect.bottom )
				} );
			}

			function setTopFixed() {
				area.setStyles( {
					position: 'fixed',
					top: 0
				} );
			}

			function setBottom() {
				area.setStyles( {
					position: 'absolute',
					top: cssLength( contentsPos.y + contentsRect.height - areaRect.height )
				} );
			}

			// ---------------------------------------- Vertical layout -----------------------------------------

			var leftBase = area.getStyle( 'position' ) == 'fixed' ?
				contentsRect.left :
				body.getComputedStyle( 'position' ) != 'static' ? contentsPos.x - bodyPos.x : contentsPos.x;

			// Content is narrower than notification
			if ( contentsRect.width < notificationWidth + notificationMargin ) {

				// +---Viewport-------------------------------+
				// |                                          |
				// |                 +---Content------------+ |
				// |                 |                      | |
				// |             +------Notification------+ | |
				// |                 |                      | |
				// |                 +----------------------+ |
				// |                                          |
				// +------------------------------------------+
				if ( contentsPos.x + notificationWidth + notificationMargin > scrollPos.x + viewRect.width ) {
					setRight();

				// +---Viewport-------------------------------+               +---Viewport--------------------------+
				// |                                          |               |                                     |
				// |     +---Content------------+             |            +---Content------------+                 |
				// |     |                      |             |            |  |                   |                 |
				// |     | +------Notification------+         |    OR      | +------Notification------+             |
				// |     |                      |             |            |  |                   |                 |
				// |     +----------------------+             |            +----------------------+                 |
				// |                                          |               |                                     |
				// +------------------------------------------+               +-------------------------------------+
				} else {
					setLeft();
				}

			// Content is wider than notification.
			} else {

				//                       +--+Viewport+------------------------+
				//                       |                                    |
				//                       |             +---Content-----------------------------------------+
				//                       |             |                      |                            |
				//                       |             | +-----+Notification+-----+                        |
				//                       |             |                      |                            |
				//                       |             |                      |                            |
				//                       |             |                      |                            |
				//                       |             +---------------------------------------------------+
				//                       |                                    |
				//                       +------------------------------------+
				if ( contentsPos.x + notificationWidth + notificationMargin > scrollPos.x + viewRect.width ) {
					setLeft();

				//                       +---Viewport-------------------------+
				//                       |                                    |
				//                       |  +---Content----------------------------------------------+
				//                       |  |                                 |                      |
				//                       |  |      +------Notification------+ |                      |
				//                       |  |                                 |                      |
				//                       |  |                                 |                      |
				//                       |  +--------------------------------------------------------+
				//                       |                                    |
				//                       +------------------------------------+
				} else if ( contentsPos.x + contentsRect.width / 2 +
					notificationWidth / 2 + notificationMargin > scrollPos.x + viewRect.width ) {
					setRightFixed();

				//                       +---Viewport-------------------------+
				//                       |                                    |
				//   +---Content----------------------------+                 |
				//   |                   |                  |                 |
				//   |           +------Notification------+ |                 |
				//   |                   |                  |                 |
				//   |                   |                  |                 |
				//   +--------------------------------------+                 |
				//                       |                                    |
				//                       +------------------------------------+
				} else if ( contentsRect.left + contentsRect.width - notificationWidth - notificationMargin < 0 ) {
					setRight();

				//                       +---Viewport-------------------------+
				//                       |                                    |
				// +---Content---------------------------------------------+  |
				// |                     |                                 |  |
				// |                     | +------Notification------+      |  |
				// |                     |                                 |  |
				// |                     |                                 |  |
				// +-------------------------------------------------------+  |
				//                       |                                    |
				//                       +------------------------------------+
				} else if ( contentsRect.left + contentsRect.width / 2 - notificationWidth / 2 < 0 ) {
					setLeftFixed();

				//                       +---Viewport-------------------------+
				//                       |                                    |
				//                       | +---Content----------------------+ |
				//                       | |                                | |
				//                       | |    +-----Notification-----+    | |
				//                       | |                                | |
				//                       | |                                | |
				//                       | +--------------------------------+ |
				//                       |                                    |
				//                       +------------------------------------+
				} else {
					setCenter();
				}
			}

			function setLeft() {
				area.setStyle( 'left', cssLength( leftBase ) );
			}

			function setLeftFixed() {
				area.setStyle( 'left', cssLength( leftBase - contentsPos.x + scrollPos.x ) );
			}

			function setCenter() {
				area.setStyle( 'left', cssLength( leftBase + contentsRect.width / 2 - notificationWidth / 2 - notificationMargin / 2 ) );
			}

			function setRight() {
				area.setStyle( 'left', cssLength( leftBase + contentsRect.width - notificationWidth - notificationMargin ) );
			}

			function setRightFixed() {
				area.setStyle( 'left', cssLength( leftBase - contentsPos.x + scrollPos.x + viewRect.width -
					notificationWidth - notificationMargin ) );
			}
		}
	};

	CKEDITOR.plugins.notification = Notification;

	/**
	 * After how many milliseconds the notification of the `info` and `success`
	 * {@link CKEDITOR.plugins.notification#type type} should close automatically.
	 * `0` means that notifications will not close automatically.
	 * Note that `warning` and `progress` notifications will never close automatically.
	 *
	 * Refer to the [Notifications](https://ckeditor.com/docs/ckeditor4/latest/guide/dev_notifications.html) article
	 * for more information about this feature.
	 *
	 * @since 4.5.0
	 * @cfg {Number} [notification_duration=5000]
	 * @member CKEDITOR.config
	 */

	/**
	 * Event fired when the {@link CKEDITOR.plugins.notification#show} method is called, before the
	 * notification is shown. If this event is canceled, the notification will not be shown.
	 *
	 * Using this event allows you to fully customize how a notification will be shown. It may be used to integrate
	 * the CKEditor notification system with your web page notifications.
	 *
	 * @since 4.5.0
	 * @event notificationShow
	 * @member CKEDITOR.editor
	 * @param data
	 * @param {CKEDITOR.plugins.notification} data.notification Notification which will be shown.
	 * @param {CKEDITOR.editor} editor The editor instance.
	 */

	/**
	 * Event fired when the {@link CKEDITOR.plugins.notification#update} method is called, before the
	 * notification is updated. If this event is canceled, the notification will not be shown even if the update was important,
	 * but the object will be updated anyway. Note that canceling this event does not prevent updating {@link #element}
	 * attributes, but if {@link #notificationShow} was canceled as well, this element is detached from the DOM.
	 *
	 * Using this event allows you to fully customize how a notification will be updated. It may be used to integrate
	 * the CKEditor notification system with your web page notifications.
	 *
	 * @since 4.5.0
	 * @event notificationUpdate
	 * @member CKEDITOR.editor
	 * @param data
	 * @param {CKEDITOR.plugins.notification} data.notification Notification which will be updated.
	 * Note that it contains the data that has not been updated yet.
	 * @param {Object} data.options Update options, see {@link CKEDITOR.plugins.notification#update}.
	 * @param {CKEDITOR.editor} editor The editor instance.
	 */

	/**
	 * Event fired when the {@link CKEDITOR.plugins.notification#hide} method is called, before the
	 * notification is hidden. If this event is canceled, the notification will not be hidden.
	 *
	 * Using this event allows you to fully customize how a notification will be hidden. It may be used to integrate
	 * the CKEditor notification system with your web page notifications.
	 *
	 * @since 4.5.0
	 * @event notificationHide
	 * @member CKEDITOR.editor
	 * @param data
	 * @param {CKEDITOR.plugins.notification} data.notification Notification which will be hidden.
	 * @param {CKEDITOR.editor} editor The editor instance.
	 */

} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

( function() {
	var template = '<a id="{id}"' +
		' class="cke_button cke_button__{name} cke_button_{state} {cls}"' +
		( CKEDITOR.env.gecko && !CKEDITOR.env.hc ? '' : ' href="javascript:void(\'{titleJs}\')"' ) +
		' title="{title}"' +
		' tabindex="-1"' +
		' hidefocus="true"' +
		' role="button"' +
		' aria-labelledby="{id}_label"' +
		' aria-describedby="{id}_description"' +
		' aria-haspopup="{hasArrow}"' +
		' aria-disabled="{ariaDisabled}"';

	// Some browsers don't cancel key events in the keydown but in the
	// keypress.
	// TODO: Check if really needed.
	if ( CKEDITOR.env.gecko && CKEDITOR.env.mac )
		template += ' onkeypress="return false;"';

	// With Firefox, we need to force the button to redraw, otherwise it
	// will remain in the focus state.
	if ( CKEDITOR.env.gecko )
		template += ' onblur="this.style.cssText = this.style.cssText;"';

	// IE and Edge needs special click handler based on mouseup event with additional check
	// of which mouse button was clicked (https://dev.ckeditor.com/ticket/188, #2565).
	var specialClickHandler = '';
	if ( CKEDITOR.env.ie ) {
		specialClickHandler = 'return false;" onmouseup="CKEDITOR.tools.getMouseButton(event)==CKEDITOR.MOUSE_BUTTON_LEFT&&';
	}

	template += ' onkeydown="return CKEDITOR.tools.callFunction({keydownFn},event);"' +
		' onfocus="return CKEDITOR.tools.callFunction({focusFn},event);" ' +
		'onclick="' + specialClickHandler + 'CKEDITOR.tools.callFunction({clickFn},this);return false;">' +
		'<span class="cke_button_icon cke_button__{iconName}_icon" style="{style}"';


	template += '>&nbsp;</span>' +
		'<span id="{id}_label" class="cke_button_label cke_button__{name}_label" aria-hidden="false">{label}</span>' +
		'<span id="{id}_description" class="cke_button_label" aria-hidden="false">{ariaShortcut}</span>' +
		'{arrowHtml}' +
		'</a>';

	var templateArrow = '<span class="cke_button_arrow">' +
		// BLACK DOWN-POINTING TRIANGLE
	( CKEDITOR.env.hc ? '&#9660;' : '' ) +
		'</span>';

	var btnArrowTpl = CKEDITOR.addTemplate( 'buttonArrow', templateArrow ),
		btnTpl = CKEDITOR.addTemplate( 'button', template );

	CKEDITOR.plugins.add( 'button', {
		beforeInit: function( editor ) {
			editor.ui.addHandler( CKEDITOR.UI_BUTTON, CKEDITOR.ui.button.handler );
		}
	} );

	/**
	 * Button UI element.
	 *
	 * @readonly
	 * @property {String} [='button']
	 * @member CKEDITOR
	 */
	CKEDITOR.UI_BUTTON = 'button';

	/**
	 * Represents a button UI element. This class should not be called directly. To
	 * create new buttons use {@link CKEDITOR.ui#addButton} instead.
	 *
	 * @class
	 * @constructor Creates a button class instance.
	 * @param {Object} definition The button definition.
	 */
	CKEDITOR.ui.button = function( definition ) {
		CKEDITOR.tools.extend( this, definition,
		// Set defaults.
		{
			title: definition.label,
			click: definition.click ||
			function( editor ) {
				editor.execCommand( definition.command );
			}
		} );

		this._ = {};
	};

	/**
	 * Represents the button handler object.
	 *
	 * @class
	 * @singleton
	 * @extends CKEDITOR.ui.handlerDefinition
	 */
	CKEDITOR.ui.button.handler = {
		/**
		 * Transforms a button definition into a {@link CKEDITOR.ui.button} instance.
		 *
		 * @member CKEDITOR.ui.button.handler
		 * @param {Object} definition
		 * @returns {CKEDITOR.ui.button}
		 */
		create: function( definition ) {
			return new CKEDITOR.ui.button( definition );
		}
	};

	/** @class CKEDITOR.ui.button */
	CKEDITOR.ui.button.prototype = {
		/**
		 * Renders the button.
		 *
		 * @param {CKEDITOR.editor} editor The editor instance which this button is
		 * to be used by.
		 * @param {Array} output The output array to which the HTML code related to
		 * this button should be appended.
		 */
		render: function( editor, output ) {
			var modeStates = null;

			function updateState() {
				// "this" is a CKEDITOR.ui.button instance.
				var mode = editor.mode;

				if ( mode ) {
					// Restore saved button state.
					var state = this.modes[ mode ] ? modeStates[ mode ] !== undefined ? modeStates[ mode ] : CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED;

					state = editor.readOnly && !this.readOnly ? CKEDITOR.TRISTATE_DISABLED : state;

					this.setState( state );

					// Let plugin to disable button.
					if ( this.refresh )
						this.refresh();
				}
			}

			var env = CKEDITOR.env,
				id = this._.id = CKEDITOR.tools.getNextId(),
				stateName = '',
				command = this.command,
				// Get the command name.
				clickFn,
				keystroke,
				shortcut;

			this._.editor = editor;

			var instance = {
				id: id,
				button: this,
				editor: editor,
				focus: function() {
					var element = CKEDITOR.document.getById( id );
					element.focus();
				},
				execute: function() {
					this.button.click( editor );
				},
				attach: function( editor ) {
					this.button.attach( editor );
				}
			};

			var keydownFn = CKEDITOR.tools.addFunction( function( ev ) {
				if ( instance.onkey ) {
					ev = new CKEDITOR.dom.event( ev );
					return ( instance.onkey( instance, ev.getKeystroke() ) !== false );
				}
			} );

			var focusFn = CKEDITOR.tools.addFunction( function( ev ) {
				var retVal;

				if ( instance.onfocus )
					retVal = ( instance.onfocus( instance, new CKEDITOR.dom.event( ev ) ) !== false );

				return retVal;
			} );

			var selLocked = 0;

			instance.clickFn = clickFn = CKEDITOR.tools.addFunction( function() {

				// Restore locked selection in Opera.
				if ( selLocked ) {
					editor.unlockSelection( 1 );
					selLocked = 0;
				}
				instance.execute();

				// Fixed iOS focus issue when your press disabled button (https://dev.ckeditor.com/ticket/12381).
				if ( env.iOS ) {
					editor.focus();
				}
			} );


			// Indicate a mode sensitive button.
			if ( this.modes ) {
				modeStates = {};

				editor.on( 'beforeModeUnload', function() {
					if ( editor.mode && this._.state != CKEDITOR.TRISTATE_DISABLED )
						modeStates[ editor.mode ] = this._.state;
				}, this );

				// Update status when activeFilter, mode or readOnly changes.
				editor.on( 'activeFilterChange', updateState, this );
				editor.on( 'mode', updateState, this );
				// If this button is sensitive to readOnly state, update it accordingly.
				!this.readOnly && editor.on( 'readOnly', updateState, this );

			} else if ( command ) {
				// Get the command instance.
				command = editor.getCommand( command );

				if ( command ) {
					command.on( 'state', function() {
						this.setState( command.state );
					}, this );

					stateName += ( command.state == CKEDITOR.TRISTATE_ON ? 'on' : command.state == CKEDITOR.TRISTATE_DISABLED ? 'disabled' : 'off' );
				}
			}

			var iconName;

			// For button that has text-direction awareness on selection path.
			if ( this.directional ) {
				editor.on( 'contentDirChanged', function( evt ) {
					var el = CKEDITOR.document.getById( this._.id ),
						icon = el.getFirst();

					var pathDir = evt.data;

					// Make a minor direction change to become style-able for the skin icon.
					if ( pathDir !=  editor.lang.dir )
						el.addClass( 'cke_' + pathDir );
					else
						el.removeClass( 'cke_ltr' ).removeClass( 'cke_rtl' );

					// Inline style update for the plugin icon.
					icon.setAttribute( 'style', CKEDITOR.skin.getIconStyle( iconName, pathDir == 'rtl', this.icon, this.iconOffset ) );
				}, this );
			}

			if ( !command ) {
				stateName += 'off';
			} else {
				keystroke = editor.getCommandKeystroke( command );

				if ( keystroke ) {
					shortcut = CKEDITOR.tools.keystrokeToString( editor.lang.common.keyboard, keystroke );
				}
			}

			var name = this.name || this.command,
				iconPath = null,
				overridePath = this.icon;

			iconName = name;

			// Check if we're pointing to an icon defined by another command. (https://dev.ckeditor.com/ticket/9555)
			if ( this.icon && !( /\./ ).test( this.icon ) ) {
				iconName = this.icon;
				overridePath = null;

			} else {
				// Register and use custom icon for button (#1530).
				if ( this.icon ) {
					iconPath = this.icon;
				}
				if ( CKEDITOR.env.hidpi && this.iconHiDpi ) {
					iconPath = this.iconHiDpi;
				}
			}

			if ( iconPath ) {
				CKEDITOR.skin.addIcon( iconPath, iconPath );
				overridePath = null;
			} else {
				iconPath = iconName;
			}

			var params = {
				id: id,
				name: name,
				iconName: iconName,
				label: this.label,
				// .cke_button_expandable enables additional styling for popup buttons (#2483).
				cls:  ( this.hasArrow ? 'cke_button_expandable ' : '' ) + ( this.className || '' ),
				state: stateName,
				ariaDisabled: stateName == 'disabled' ? 'true' : 'false',
				title: this.title + ( shortcut ? ' (' + shortcut.display + ')' : '' ),
				ariaShortcut: shortcut ? editor.lang.common.keyboardShortcut + ' ' + shortcut.aria : '',
				titleJs: env.gecko && !env.hc ? '' : ( this.title || '' ).replace( "'", '' ),
				hasArrow: typeof this.hasArrow === 'string' && this.hasArrow || ( this.hasArrow ? 'true' : 'false' ),
				keydownFn: keydownFn,
				focusFn: focusFn,
				clickFn: clickFn,
				style: CKEDITOR.skin.getIconStyle( iconPath, ( editor.lang.dir == 'rtl' ), overridePath, this.iconOffset ),
				arrowHtml: this.hasArrow ? btnArrowTpl.output() : ''
			};

			btnTpl.output( params, output );

			if ( this.onRender )
				this.onRender();

			return instance;
		},

		/**
		 * Sets the button state.
		 *
		 * @param {Number} state Indicates the button state. One of {@link CKEDITOR#TRISTATE_ON},
		 * {@link CKEDITOR#TRISTATE_OFF}, or {@link CKEDITOR#TRISTATE_DISABLED}.
		 */
		setState: function( state ) {
			if ( this._.state == state )
				return false;

			this._.state = state;

			var element = CKEDITOR.document.getById( this._.id );

			if ( element ) {
				element.setState( state, 'cke_button' );
				element.setAttribute( 'aria-disabled', state == CKEDITOR.TRISTATE_DISABLED );

				if ( !this.hasArrow ) {
					// Note: aria-pressed attribute should not be added to menuButton instances. (https://dev.ckeditor.com/ticket/11331)
					if ( state === CKEDITOR.TRISTATE_ON ) {
						element.setAttribute( 'aria-pressed', true );
					} else {
						element.removeAttribute( 'aria-pressed' );
					}
				} else {
					// Indicates that menu button is opened (#421).
					element.setAttribute( 'aria-expanded', state == CKEDITOR.TRISTATE_ON );
				}

				return true;
			} else {
				return false;
			}
		},

		/**
		 * Gets the button state.
		 *
		 * @returns {Number} The button state. One of {@link CKEDITOR#TRISTATE_ON},
		 * {@link CKEDITOR#TRISTATE_OFF}, or {@link CKEDITOR#TRISTATE_DISABLED}.
		 */
		getState: function() {
			return this._.state;
		},

		/**
		 * Returns this button's {@link CKEDITOR.feature} instance.
		 *
		 * It may be this button instance if it has at least one of
		 * `allowedContent` and `requiredContent` properties. Otherwise,
		 * if a command is bound to this button by the `command` property, then
		 * that command will be returned.
		 *
		 * This method implements the {@link CKEDITOR.feature#toFeature} interface method.
		 *
		 * @since 4.1.0
		 * @param {CKEDITOR.editor} Editor instance.
		 * @returns {CKEDITOR.feature} The feature.
		 */
		toFeature: function( editor ) {
			if ( this._.feature )
				return this._.feature;

			var feature = this;

			// If button isn't a feature, return command if is bound.
			if ( !this.allowedContent && !this.requiredContent && this.command )
				feature = editor.getCommand( this.command ) || feature;

			return this._.feature = feature;
		}
	};

	/**
	 * Adds a button definition to the UI elements list.
	 *
	 *		editorInstance.ui.addButton( 'MyBold', {
	 *			label: 'My Bold',
	 *			command: 'bold',
	 *			toolbar: 'basicstyles,1'
	 *		} );
	 *
	 * @member CKEDITOR.ui
	 * @param {String} name The button name.
	 * @param {Object} definition The button definition.
	 * @param {String} definition.label The textual part of the button (if visible) and its tooltip.
	 * @param {String} definition.command The command to be executed once the button is activated.
	 * @param {String} definition.toolbar The {@link CKEDITOR.config#toolbarGroups toolbar group} into which
	 * the button will be added. An optional index value (separated by a comma) determines the button position within the group.
	 * @param {String} definition.icon The path to a custom icon or icon name registered by another plugin. Custom icon paths
	 * are supported since the **4.9.0** version.
	 *
	 * To use icon registered by another plugin, icon parameter should be used like:
	 *
	 * 		editor.ui.addButton( 'my_button', {
	 * 			icon: 'Link' // Uses link icon from Link plugin.
	 * 		} );
	 *
	 * If the plugin provides a HiDPI version of an icon, it will be used for HiDPI displays (so defining `iconHiDpi` is not needed
	 * in this case).
	 *
	 * To use a custom icon, the path to the icon should be provided:
	 *
	 * 		editor.ui.addButton( 'my_button', {
	 * 			icon: 'assets/icons/my_button.png'
	 * 		} )
	 *
	 * This icon will be used for both standard and HiDPI displays unless `iconHiDpi` is explicitly defined.
	 * **Important**: CKEditor will resolve relative paths based on {@link CKEDITOR#basePath}.
	 * @param {String} definition.iconHiDpi The path to the custom HiDPI icon version. Supported since **4.9.0** version.
	 * It will be used only in HiDPI environments. The usage is similar to the `icon` parameter:
	 *
	 * 		editor.ui.addButton( 'my_button', {
	 * 			iconHiDpi: 'assets/icons/my_button.hidpi.png'
	 * 		} )
	 * @param {String/Boolean} definition.hasArrow If Boolean, it indicates whether the button should have a dropdown. If a string, it acts
	 * as a value of the button's `aria-haspopup` attribute. Since **4.11.0** it supports the string as a value.
	 */
	CKEDITOR.ui.prototype.addButton = function( name, definition ) {
		this.add( name, CKEDITOR.UI_BUTTON, definition );
	};

} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview The "toolbar" plugin. Renders the default toolbar interface in
 * the editor.
 */

( function() {
	var toolbox = function() {
			this.toolbars = [];
			this.focusCommandExecuted = false;
		};

	toolbox.prototype.focus = function() {
		for ( var t = 0, toolbar; toolbar = this.toolbars[ t++ ]; ) {
			for ( var i = 0, item; item = toolbar.items[ i++ ]; ) {
				if ( item.focus ) {
					item.focus();
					return;
				}
			}
		}
	};

	var commands = {
		toolbarFocus: {
			modes: { wysiwyg: 1, source: 1 },
			readOnly: 1,

			exec: function( editor ) {
				if ( editor.toolbox ) {
					editor.toolbox.focusCommandExecuted = true;

					// Make the first button focus accessible for IE. (https://dev.ckeditor.com/ticket/3417)
					// Adobe AIR instead need while of delay.
					if ( CKEDITOR.env.ie || CKEDITOR.env.air ) {
						setTimeout( function() {
							editor.toolbox.focus();
						}, 100 );
					} else {
						editor.toolbox.focus();
					}
				}
			}
		}
	};

	CKEDITOR.plugins.add( 'toolbar', {
		requires: 'button',
		// jscs:disable maximumLineLength
		// jscs:enable maximumLineLength

		init: function( editor ) {
			var endFlag;

			var itemKeystroke = function( item, keystroke ) {
					var next, toolbar;
					var rtl = editor.lang.dir == 'rtl',
						toolbarGroupCycling = editor.config.toolbarGroupCycling,
						// Picking right/left key codes.
						rightKeyCode = rtl ? 37 : 39,
						leftKeyCode = rtl ? 39 : 37;

					toolbarGroupCycling = toolbarGroupCycling === undefined || toolbarGroupCycling;

					switch ( keystroke ) {
						case 9: // TAB
						case CKEDITOR.SHIFT + 9: // SHIFT + TAB
							// Cycle through the toolbars, starting from the one
							// closest to the current item.
							while ( !toolbar || !toolbar.items.length ) {
								if ( keystroke == 9 ) {
									toolbar = ( ( toolbar ? toolbar.next : item.toolbar.next ) || editor.toolbox.toolbars[ 0 ] );
								} else {
									toolbar = ( ( toolbar ? toolbar.previous : item.toolbar.previous ) || editor.toolbox.toolbars[ editor.toolbox.toolbars.length - 1 ] );
								}

								// Look for the first item that accepts focus.
								if ( toolbar.items.length ) {
									item = toolbar.items[ endFlag ? ( toolbar.items.length - 1 ) : 0 ];
									while ( item && !item.focus ) {
										item = endFlag ? item.previous : item.next;

										if ( !item )
											toolbar = 0;
									}
								}
							}

							if ( item )
								item.focus();

							return false;

						case rightKeyCode:
							next = item;
							do {
								// Look for the next item in the toolbar.
								next = next.next;

								// If it's the last item, cycle to the first one.
								if ( !next && toolbarGroupCycling ) next = item.toolbar.items[ 0 ];
							}
							while ( next && !next.focus );

							// If available, just focus it, otherwise focus the
							// first one.
							if ( next )
								next.focus();
							else
								// Send a TAB.
								itemKeystroke( item, 9 );

							return false;
						case 40: // DOWN-ARROW
							if ( item.button && item.button.hasArrow ) {
								item.execute();
							} else {
								// Send left arrow key.
								itemKeystroke( item, keystroke == 40 ? rightKeyCode : leftKeyCode );
							}
							return false;
						case leftKeyCode:
						case 38: // UP-ARROW
							next = item;
							do {
								// Look for the previous item in the toolbar.
								next = next.previous;

								// If it's the first item, cycle to the last one.
								if ( !next && toolbarGroupCycling ) next = item.toolbar.items[ item.toolbar.items.length - 1 ];
							}
							while ( next && !next.focus );

							// If available, just focus it, otherwise focus the
							// last one.
							if ( next )
								next.focus();
							else {
								endFlag = 1;
								// Send a SHIFT + TAB.
								itemKeystroke( item, CKEDITOR.SHIFT + 9 );
								endFlag = 0;
							}

							return false;

						case 27: // ESC
							editor.focus();
							return false;

						case 13: // ENTER
						case 32: // SPACE
							item.execute();
							return false;
					}
					return true;
				};

			editor.on( 'uiSpace', function( event ) {
				if ( event.data.space != editor.config.toolbarLocation )
					return;

				// Create toolbar only once.
				event.removeListener();

				editor.toolbox = new toolbox();

				var labelId = CKEDITOR.tools.getNextId();

				var output = [
					'<span id="', labelId, '" class="cke_voice_label">', editor.lang.toolbar.toolbars, '</span>',
					'<span id="' + editor.ui.spaceId( 'toolbox' ) + '" class="cke_toolbox" role="group" aria-labelledby="', labelId, '" onmousedown="return false;">'
				];

				var expanded = editor.config.toolbarStartupExpanded !== false,
					groupStarted, pendingSeparator;

				// If the toolbar collapser will be available, we'll have
				// an additional container for all toolbars.
				if ( editor.config.toolbarCanCollapse && editor.elementMode != CKEDITOR.ELEMENT_MODE_INLINE )
					output.push( '<span class="cke_toolbox_main"' + ( expanded ? '>' : ' style="display:none">' ) );

				var toolbars = editor.toolbox.toolbars,
					toolbar = getToolbarConfig( editor ),
					toolbarLength = toolbar.length;

				for ( var r = 0; r < toolbarLength; r++ ) {
					var toolbarId,
						toolbarObj = 0,
						toolbarName,
						row = toolbar[ r ],
						lastToolbarInRow = row !== '/' && ( toolbar[ r + 1 ] === '/' || r == toolbarLength - 1 ),
						items;

					// It's better to check if the row object is really
					// available because it's a common mistake to leave
					// an extra comma in the toolbar definition
					// settings, which leads on the editor not loading
					// at all in IE. (https://dev.ckeditor.com/ticket/3983)
					if ( !row )
						continue;

					if ( groupStarted ) {
						output.push( '</span>' );
						groupStarted = 0;
						pendingSeparator = 0;
					}

					if ( row === '/' ) {
						output.push( '<span class="cke_toolbar_break"></span>' );
						continue;
					}

					items = row.items || row;

					// Create all items defined for this toolbar.
					for ( var i = 0; i < items.length; i++ ) {
						var item = items[ i ],
							canGroup;

						if ( item ) {
							if ( item.type == CKEDITOR.UI_SEPARATOR ) {
								// Do not add the separator immediately. Just save
								// it be included if we already have something in
								// the toolbar and if a new item is to be added (later).
								pendingSeparator = groupStarted && item;
								continue;
							}

							canGroup = item.canGroup !== false;

							// Initialize the toolbar first, if needed.
							if ( !toolbarObj ) {
								// Create the basic toolbar object.
								toolbarId = CKEDITOR.tools.getNextId();
								toolbarObj = { id: toolbarId, items: [] };
								toolbarName = row.name && ( editor.lang.toolbar.toolbarGroups[ row.name ] || row.name );

								// Output the toolbar opener.
								output.push( '<span id="', toolbarId, '" class="cke_toolbar' + ( lastToolbarInRow ? ' cke_toolbar_last"' : '"' ),
									( toolbarName ? ' aria-labelledby="' + toolbarId + '_label"' : '' ), ' role="toolbar">' );

								// If a toolbar name is available, send the voice label.
								toolbarName && output.push( '<span id="', toolbarId, '_label" class="cke_voice_label">', toolbarName, '</span>' );

								output.push( '<span class="cke_toolbar_start"></span>' );

								// Add the toolbar to the "editor.toolbox.toolbars"
								// array.
								var index = toolbars.push( toolbarObj ) - 1;

								// Create the next/previous reference.
								if ( index > 0 ) {
									toolbarObj.previous = toolbars[ index - 1 ];
									toolbarObj.previous.next = toolbarObj;
								}
							}

							if ( canGroup ) {
								if ( !groupStarted ) {
									output.push( '<span class="cke_toolgroup" role="presentation">' );
									groupStarted = 1;
								}
							} else if ( groupStarted ) {
								output.push( '</span>' );
								groupStarted = 0;
							}

							function addItem( item ) { // jshint ignore:line
								var itemObj = item.render( editor, output );
								index = toolbarObj.items.push( itemObj ) - 1;

								if ( index > 0 ) {
									itemObj.previous = toolbarObj.items[ index - 1 ];
									itemObj.previous.next = itemObj;
								}

								itemObj.toolbar = toolbarObj;
								itemObj.onkey = itemKeystroke;

								// Fix for https://dev.ckeditor.com/ticket/3052:
								// Prevent JAWS from focusing the toolbar after document load.
								itemObj.onfocus = function() {
									if ( !editor.toolbox.focusCommandExecuted )
										editor.focus();
								};
							}

							if ( pendingSeparator ) {
								addItem( pendingSeparator );
								pendingSeparator = 0;
							}

							addItem( item );
						}
					}

					if ( groupStarted ) {
						output.push( '</span>' );
						groupStarted = 0;
						pendingSeparator = 0;
					}

					if ( toolbarObj )
						output.push( '<span class="cke_toolbar_end"></span></span>' );
				}

				if ( editor.config.toolbarCanCollapse )
					output.push( '</span>' );

				// Not toolbar collapser for inline mode.
				if ( editor.config.toolbarCanCollapse && editor.elementMode != CKEDITOR.ELEMENT_MODE_INLINE ) {
					var collapserFn = CKEDITOR.tools.addFunction( function() {
						editor.execCommand( 'toolbarCollapse' );
					} );

					editor.on( 'destroy', function() {
						CKEDITOR.tools.removeFunction( collapserFn );
					} );

					editor.addCommand( 'toolbarCollapse', {
						readOnly: 1,
						exec: function( editor ) {
							var collapser = editor.ui.space( 'toolbar_collapser' ),
								toolbox = collapser.getPrevious(),
								contents = editor.ui.space( 'contents' ),
								toolboxContainer = toolbox.getParent(),
								contentHeight = parseInt( contents.$.style.height, 10 ),
								previousHeight = toolboxContainer.$.offsetHeight,
								minClass = 'cke_toolbox_collapser_min',
								collapsed = collapser.hasClass( minClass );

							if ( !collapsed ) {
								toolbox.hide();
								collapser.addClass( minClass );
								collapser.setAttribute( 'title', editor.lang.toolbar.toolbarExpand );
							} else {
								toolbox.show();
								collapser.removeClass( minClass );
								collapser.setAttribute( 'title', editor.lang.toolbar.toolbarCollapse );
							}

							// Update collapser symbol.
							collapser.getFirst().setText( collapsed ? '\u25B2' : // BLACK UP-POINTING TRIANGLE
							'\u25C0' ); // BLACK LEFT-POINTING TRIANGLE

							var dy = toolboxContainer.$.offsetHeight - previousHeight;
							contents.setStyle( 'height', ( contentHeight - dy ) + 'px' );

							editor.fire( 'resize', {
								outerHeight: editor.container.$.offsetHeight,
								contentsHeight: contents.$.offsetHeight,
								outerWidth: editor.container.$.offsetWidth
							} );
						},

						modes: { wysiwyg: 1, source: 1 }
					} );

					editor.setKeystroke( CKEDITOR.ALT + ( CKEDITOR.env.ie || CKEDITOR.env.webkit ? 189 : 109 ) /*-*/, 'toolbarCollapse' );

					output.push( '<a title="' + ( expanded ? editor.lang.toolbar.toolbarCollapse : editor.lang.toolbar.toolbarExpand ) +
						'" id="' + editor.ui.spaceId( 'toolbar_collapser' ) +
						'" tabIndex="-1" class="cke_toolbox_collapser' );

					if ( !expanded )
						output.push( ' cke_toolbox_collapser_min' );

					output.push( '" onclick="CKEDITOR.tools.callFunction(' + collapserFn + ')">', '<span class="cke_arrow">&#9650;</span>', // BLACK UP-POINTING TRIANGLE
						'</a>' );
				}

				output.push( '</span>' );
				event.data.html += output.join( '' );
			} );

			editor.on( 'destroy', function() {
				if ( this.toolbox ) {
					var toolbars,
						index = 0,
						i, items, instance;
					toolbars = this.toolbox.toolbars;
					for ( ; index < toolbars.length; index++ ) {
						items = toolbars[ index ].items;
						for ( i = 0; i < items.length; i++ ) {
							instance = items[ i ];
							if ( instance.clickFn )
								CKEDITOR.tools.removeFunction( instance.clickFn );
							if ( instance.keyDownFn )
								CKEDITOR.tools.removeFunction( instance.keyDownFn );
						}
					}
				}
			} );

			// Manage editor focus  when navigating the toolbar.
			editor.on( 'uiReady', function() {
				var toolbox = editor.ui.space( 'toolbox' );
				toolbox && editor.focusManager.add( toolbox, 1 );
			} );

			editor.addCommand( 'toolbarFocus', commands.toolbarFocus );
			editor.setKeystroke( CKEDITOR.ALT + 121 /*F10*/, 'toolbarFocus' );

			editor.ui.add( '-', CKEDITOR.UI_SEPARATOR, {} );
			editor.ui.addHandler( CKEDITOR.UI_SEPARATOR, {
				create: function() {
					return {
						render: function( editor, output ) {
							output.push( '<span class="cke_toolbar_separator" role="separator"></span>' );
							return {};
						}
					};
				}
			} );
		}
	} );

	function getToolbarConfig( editor ) {
		var removeButtons = editor.config.removeButtons;

		removeButtons = removeButtons && removeButtons.split( ',' );

		function buildToolbarConfig() {

			// Object containing all toolbar groups used by ui items.
			var lookup = getItemDefinedGroups();

			// Take the base for the new toolbar, which is basically a toolbar
			// definition without items.
			var toolbar = CKEDITOR.tools.clone( editor.config.toolbarGroups ) || getPrivateToolbarGroups( editor );

			// Fill the toolbar groups with the available ui items.
			for ( var i = 0; i < toolbar.length; i++ ) {
				var toolbarGroup = toolbar[ i ];

				// Skip toolbar break.
				if ( toolbarGroup == '/' )
					continue;
				// Handle simply group name item.
				else if ( typeof toolbarGroup == 'string' )
					toolbarGroup = toolbar[ i ] = { name: toolbarGroup };

				var items, subGroups = toolbarGroup.groups;

				// Look for items that match sub groups.
				if ( subGroups ) {
					for ( var j = 0, sub; j < subGroups.length; j++ ) {
						sub = subGroups[ j ];

						// If any ui item is registered for this subgroup.
						items = lookup[ sub ];
						items && fillGroup( toolbarGroup, items );
					}
				}

				// Add the main group items as well.
				items = lookup[ toolbarGroup.name ];
				items && fillGroup( toolbarGroup, items );
			}

			return toolbar;
		}

		// Returns an object containing all toolbar groups used by ui items.
		function getItemDefinedGroups() {
			var groups = {},
				itemName, item, itemToolbar, group, order;

			for ( itemName in editor.ui.items ) {
				item = editor.ui.items[ itemName ];
				itemToolbar = item.toolbar || 'others';
				if ( itemToolbar ) {
					// Break the toolbar property into its parts: "group_name[,order]".
					itemToolbar = itemToolbar.split( ',' );
					group = itemToolbar[ 0 ];
					order = parseInt( itemToolbar[ 1 ] || -1, 10 );

					// Initialize the group, if necessary.
					groups[ group ] || ( groups[ group ] = [] );

					// Push the data used to build the toolbar later.
					groups[ group ].push( { name: itemName, order: order } );
				}
			}

			// Put the items in the right order.
			for ( group in groups ) {
				groups[ group ] = groups[ group ].sort( function( a, b ) {
					return a.order == b.order ? 0 :
						b.order < 0 ? -1 :
						a.order < 0 ? 1 :
						a.order < b.order ? -1 :
						1;
				} );
			}

			return groups;
		}

		function fillGroup( toolbarGroup, uiItems ) {
			if ( uiItems.length ) {
				if ( toolbarGroup.items )
					toolbarGroup.items.push( editor.ui.create( '-' ) );
				else
					toolbarGroup.items = [];

				var item, name;
				while ( ( item = uiItems.shift() ) ) {
					name = typeof item == 'string' ? item : item.name;

					// Ignore items that are configured to be removed.
					if ( !removeButtons || CKEDITOR.tools.indexOf( removeButtons, name ) == -1 ) {
						item = editor.ui.create( name );

						if ( !item )
							continue;

						if ( !editor.addFeature( item ) )
							continue;

						toolbarGroup.items.push( item );
					}
				}
			}
		}

		function populateToolbarConfig( config ) {
			var toolbar = [],
				i, group, newGroup;

			for ( i = 0; i < config.length; ++i ) {
				group = config[ i ];
				newGroup = {};

				if ( group == '/' )
					toolbar.push( group );
				else if ( CKEDITOR.tools.isArray( group ) ) {
					fillGroup( newGroup, CKEDITOR.tools.clone( group ) );
					toolbar.push( newGroup );
				}
				else if ( group.items ) {
					fillGroup( newGroup, CKEDITOR.tools.clone( group.items ) );
					newGroup.name = group.name;
					toolbar.push( newGroup );
				}
			}

			return toolbar;
		}

		var toolbar = editor.config.toolbar;

		// If it is a string, return the relative "toolbar_name" config.
		if ( typeof toolbar == 'string' )
			toolbar = editor.config[ 'toolbar_' + toolbar ];

		return ( editor.toolbar = toolbar ? populateToolbarConfig( toolbar ) : buildToolbarConfig() );
	}

	/**
	 * Adds a toolbar group. See {@link CKEDITOR.config#toolbarGroups} for more details.
	 *
	 * **Note:** This method will not modify toolbar groups set explicitly by
	 * {@link CKEDITOR.config#toolbarGroups}. It will only extend the default setting.
	 *
	 * @param {String} name Toolbar group name.
	 * @param {Number/String} previous The name of the toolbar group after which this one
	 * should be added or `0` if this group should be the first one.
	 * @param {String} [subgroupOf] The name of the parent group.
	 * @member CKEDITOR.ui
	 */
	CKEDITOR.ui.prototype.addToolbarGroup = function( name, previous, subgroupOf ) {
		// The toolbarGroups from the privates is the one we gonna use for automatic toolbar creation.
		var toolbarGroups = getPrivateToolbarGroups( this.editor ),
			atStart = previous === 0,
			newGroup = { name: name };

		if ( subgroupOf ) {
			// Transform the subgroupOf name in the real subgroup object.
			subgroupOf = CKEDITOR.tools.search( toolbarGroups, function( group ) {
				return group.name == subgroupOf;
			} );

			if ( subgroupOf ) {
				!subgroupOf.groups && ( subgroupOf.groups = [] ) ;

				if ( previous ) {
					// Search the "previous" item and add the new one after it.
					previous = CKEDITOR.tools.indexOf( subgroupOf.groups, previous );
					if ( previous >= 0 ) {
						subgroupOf.groups.splice( previous + 1, 0, name );
						return;
					}
				}

				// If no previous found.

				if ( atStart )
					subgroupOf.groups.splice( 0, 0, name );
				else
					subgroupOf.groups.push(  name );
				return;
			} else {
				// Ignore "previous" if subgroupOf has not been found.
				previous = null;
			}
		}

		if ( previous ) {
			// Transform the "previous" name into its index.
			previous = CKEDITOR.tools.indexOf( toolbarGroups, function( group ) {
				return group.name == previous;
			} );
		}

		if ( atStart )
			toolbarGroups.splice( 0, 0, name );
		else if ( typeof previous == 'number' )
			toolbarGroups.splice( previous + 1, 0, newGroup );
		else
			toolbarGroups.push( name );
	};

	function getPrivateToolbarGroups( editor ) {
		return editor._.toolbarGroups || ( editor._.toolbarGroups = [
			{ name: 'document',    groups: [ 'mode', 'document', 'doctools' ] },
			{ name: 'clipboard',   groups: [ 'clipboard', 'undo' ] },
			{ name: 'editing',     groups: [ 'find', 'selection', 'spellchecker' ] },
			{ name: 'forms' },
			'/',
			{ name: 'basicstyles', groups: [ 'basicstyles', 'cleanup' ] },
			{ name: 'paragraph',   groups: [ 'list', 'indent', 'blocks', 'align', 'bidi' ] },
			{ name: 'links' },
			{ name: 'insert' },
			'/',
			{ name: 'styles' },
			{ name: 'colors' },
			{ name: 'tools' },
			{ name: 'others' },
			{ name: 'about' }
		] );
	}
} )();

/**
 * Separator UI element.
 *
 * @readonly
 * @property {String} [='separator']
 * @member CKEDITOR
 */
CKEDITOR.UI_SEPARATOR = 'separator';

/**
 * The part of the user interface where the toolbar will be rendered. For the default
 * editor implementation, the recommended options are `'top'` and `'bottom'`.
 *
 * Please note that this option is only applicable to {@glink guide/dev_framed classic}
 * (`iframe`-based) editor. In case of {@glink guide/dev_inline inline} editor the toolbar
 * position is set dynamically depending on the position of the editable element on the screen.
 *
 * Read more in the {@glink features/toolbarlocation documentation}
 * and see the {@glink examples/toolbarlocation example}.
 *
 *		config.toolbarLocation = 'bottom';
 *
 * @cfg
 * @member CKEDITOR.config
 */
CKEDITOR.config.toolbarLocation = 'top';

/**
 * The toolbox (alias toolbar) definition. It is a toolbar name or an array of
 * toolbars (strips), each one being also an array, containing a list of UI items.
 *
 * If set to `null`, the toolbar will be generated automatically using all available buttons
 * and {@link #toolbarGroups} as a toolbar groups layout.
 *
 * In CKEditor 4.5.0+ you can generate your toolbar customization code by using the {@glink features/toolbar visual
 * toolbar configurator}.
 *
 *		// Defines a toolbar with only one strip containing the "Source" button, a
 *		// separator, and the "Bold" and "Italic" buttons.
 *		config.toolbar = [
 *			[ 'Source', '-', 'Bold', 'Italic' ]
 *		];
 *
 *		// Similar to the example above, defines a "Basic" toolbar with only one strip containing three buttons.
 *		// Note that this setting is composed by "toolbar_" added to the toolbar name, which in this case is called "Basic".
 *		// This second part of the setting name can be anything. You must use this name in the CKEDITOR.config.toolbar setting
 *		// in order to instruct the editor which `toolbar_(name)` setting should be used.
 *		config.toolbar_Basic = [
 *			[ 'Source', '-', 'Bold', 'Italic' ]
 *		];
 *		// Load toolbar_Name where Name = Basic.
 *		config.toolbar = 'Basic';
 *
 * @cfg {Array/String} [toolbar=null]
 * @member CKEDITOR.config
 */

/**
 * The toolbar groups definition.
 *
 * If the toolbar layout is not explicitly defined by the {@link #toolbar} setting, then
 * this setting is used to group all defined buttons (see {@link CKEDITOR.ui#addButton}).
 * Buttons are associated with toolbar groups by the `toolbar` property in their definition objects.
 *
 * New groups may be dynamically added during the editor and plugin initialization by
 * {@link CKEDITOR.ui#addToolbarGroup}. This is only possible if the default setting was used.
 *
 *		// Default setting.
 *		config.toolbarGroups = [
 *			{ name: 'document',	   groups: [ 'mode', 'document', 'doctools' ] },
 *			{ name: 'clipboard',   groups: [ 'clipboard', 'undo' ] },
 *			{ name: 'editing',     groups: [ 'find', 'selection', 'spellchecker' ] },
 *			{ name: 'forms' },
 *			'/',
 *			{ name: 'basicstyles', groups: [ 'basicstyles', 'cleanup' ] },
 *			{ name: 'paragraph',   groups: [ 'list', 'indent', 'blocks', 'align', 'bidi' ] },
 *			{ name: 'links' },
 *			{ name: 'insert' },
 *			'/',
 *			{ name: 'styles' },
 *			{ name: 'colors' },
 *			{ name: 'tools' },
 *			{ name: 'others' },
 *			{ name: 'about' }
 *		];
 *
 * @cfg {Array} [toolbarGroups=see example]
 * @member CKEDITOR.config
 */

/**
 * Whether the toolbar can be collapsed by the user. If disabled, the Collapse Toolbar
 * button will not be displayed.
 *
 *		config.toolbarCanCollapse = true;
 *
 * @cfg {Boolean} [toolbarCanCollapse=false]
 * @member CKEDITOR.config
 */

/**
 * Whether the toolbar must start expanded when the editor is loaded.
 *
 * Setting this option to `false` will affect the toolbar only when
 * {@link #toolbarCanCollapse} is set to `true`:
 *
 *		config.toolbarCanCollapse = true;
 *		config.toolbarStartupExpanded = false;
 *
 * @cfg {Boolean} [toolbarStartupExpanded=true]
 * @member CKEDITOR.config
 */

/**
 * When enabled, causes the *Arrow* keys navigation to cycle within the current
 * toolbar group. Otherwise the *Arrow* keys will move through all items available in
 * the toolbar. The *Tab* key will still be used to quickly jump among the
 * toolbar groups.
 *
 *		config.toolbarGroupCycling = false;
 *
 * @since 3.6.0
 * @cfg {Boolean} [toolbarGroupCycling=true]
 * @member CKEDITOR.config
 */

/**
 * List of toolbar button names that must not be rendered. This will also work
 * for non-button toolbar items, like the Font drop-down list.
 *
 *		config.removeButtons = 'Underline,JustifyCenter';
 *
 * This configuration option should not be overused. The recommended way is to use the
 * {@link CKEDITOR.config#removePlugins} setting to remove features from the editor
 * or even better, [create a custom editor build](https://ckeditor.com/cke4/builder) with
 * just the features that you will use.
 * In some cases though, a single plugin may define a set of toolbar buttons and
 * `removeButtons` may be useful when just a few of them are to be removed.
 *
 * @cfg {String} [removeButtons]
 * @member CKEDITOR.config
 */

/**
 * The toolbar definition used by the editor. It is created from the
 * {@link CKEDITOR.config#toolbar} option if it is set or automatically
 * based on {@link CKEDITOR.config#toolbarGroups}.
 *
 * @readonly
 * @property {Object} toolbar
 * @member CKEDITOR.editor
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @ignore
 * File overview: Clipboard support.
 */

//
// COPY & PASTE EXECUTION FLOWS:
// -- CTRL+C
//		* if ( isCustomCopyCutSupported )
//			* dataTransfer.setData( 'text/html', getSelectedHtml )
//		* else
//			* browser's default behavior
// -- CTRL+X
//		* listen onKey (onkeydown)
//		* fire 'saveSnapshot' on editor
//		* if ( isCustomCopyCutSupported )
//			* dataTransfer.setData( 'text/html', getSelectedHtml )
//			* extractSelectedHtml // remove selected contents
//		* else
//			* browser's default behavior
//		* deferred second 'saveSnapshot' event
// -- CTRL+V
//		* listen onKey (onkeydown)
//		* simulate 'beforepaste' for non-IEs on editable
//		* listen 'onpaste' on editable ('onbeforepaste' for IE)
//		* fire 'beforePaste' on editor
//		* if ( !canceled && ( htmlInDataTransfer || !external paste) && dataTransfer is not empty ) getClipboardDataByPastebin
//		* fire 'paste' on editor
//		* !canceled && fire 'afterPaste' on editor
// -- Copy command
//		* tryToCutCopy
//			* execCommand
//		* !success && notification
// -- Cut command
//		* fixCut
//		* tryToCutCopy
//			* execCommand
//		* !success && notification
// -- Paste command
//		* fire 'paste' on editable ('beforepaste' for IE)
//		* !canceled && execCommand 'paste'
// -- Paste from native context menu & menubar
//		(Fx & Webkits are handled in 'paste' default listener.
//		Opera cannot be handled at all because it doesn't fire any events
//		Special treatment is needed for IE, for which is this part of doc)
//		* listen 'onpaste'
//		* cancel native event
//		* fire 'beforePaste' on editor
//		* if ( !canceled && ( htmlInDataTransfer || !external paste) && dataTransfer is not empty ) getClipboardDataByPastebin
//		* execIECommand( 'paste' ) -> this fires another 'paste' event, so cancel it
//		* fire 'paste' on editor
//		* !canceled && fire 'afterPaste' on editor
//
//
// PASTE EVENT - PREPROCESSING:
// -- Possible dataValue types: auto, text, html.
// -- Possible dataValue contents:
//		* text (possible \n\r)
//		* htmlified text (text + br,div,p - no presentational markup & attrs - depends on browser)
//		* html
// -- Possible flags:
//		* htmlified - if true then content is a HTML even if no markup inside. This flag is set
//			for content from editable pastebins, because they 'htmlify' pasted content.
//
// -- Type: auto:
//		* content: htmlified text ->	filter, unify text markup (brs, ps, divs), set type: text
//		* content: html ->				filter, set type: html
// -- Type: text:
//		* content: htmlified text ->	filter, unify text markup
//		* content: html ->				filter, strip presentational markup, unify text markup
// -- Type: html:
//		* content: htmlified text ->	filter, unify text markup
//		* content: html ->				filter
//
// -- Phases:
//		* if dataValue is empty copy data from dataTransfer to dataValue (priority 1)
//		* filtering (priorities 3-5) - e.g. pastefromword filters
//		* content type sniffing (priority 6)
//		* markup transformations for text (priority 6)
//
// DRAG & DROP EXECUTION FLOWS:
// -- Drag
//		* save to the global object:
//			* drag timestamp (with 'cke-' prefix),
//			* selected html,
//			* drag range,
//			* editor instance.
//		* put drag timestamp into event.dataTransfer.text
// -- Drop
//		* if events text == saved timestamp && editor == saved editor
//			internal drag & drop occurred
//			* getRangeAtDropPosition
//			* create bookmarks for drag and drop ranges starting from the end of the document
//			* dragRange.deleteContents()
//			* fire 'paste' with saved html and drop range
//		* if events text == saved timestamp && editor != saved editor
//			cross editor drag & drop occurred
//			* getRangeAtDropPosition
//			* fire 'paste' with saved html
//			* dragRange.deleteContents()
//			* FF: refreshCursor on afterPaste
//		* if events text != saved timestamp
//			drop form external source occurred
//			* getRangeAtDropPosition
//			* if event contains html data then fire 'paste' with html
//			* else if event contains text data then fire 'paste' with encoded text
//			* FF: refreshCursor on afterPaste

'use strict';

( function() {
	var clipboardIdDataType;

	// Register the plugin.
	CKEDITOR.plugins.add( 'clipboard', {
		requires: 'dialog,notification,toolbar',
		// jscs:disable maximumLineLength
		// jscs:enable maximumLineLength
		init: function( editor ) {
			var filterType,
				filtersFactory = filtersFactoryFactory( editor );

			if ( editor.config.forcePasteAsPlainText ) {
				filterType = 'plain-text';
			} else if ( editor.config.pasteFilter ) {
				filterType = editor.config.pasteFilter;
			}
			// On Webkit the pasteFilter defaults 'semantic-content' because pasted data is so terrible
			// that it must be always filtered.
			else if ( CKEDITOR.env.webkit && !( 'pasteFilter' in editor.config ) ) {
				filterType = 'semantic-content';
			}

			editor.pasteFilter = filtersFactory.get( filterType );

			initPasteClipboard( editor );
			initDragDrop( editor );

			CKEDITOR.dialog.add( 'paste', CKEDITOR.getUrl( this.path + 'dialogs/paste.js' ) );

			// Convert image file (if present) to base64 string for Firefox. Do it as the first
			// step as the conversion is asynchronous and should hold all further paste processing.
			if ( CKEDITOR.env.gecko ) {
				var supportedImageTypes = [ 'image/png', 'image/jpeg', 'image/gif' ],
					latestId;

				editor.on( 'paste', function( evt ) {
					var dataObj = evt.data,
						data = dataObj.dataValue,
						dataTransfer = dataObj.dataTransfer;

					// If data empty check for image content inside data transfer. https://dev.ckeditor.com/ticket/16705
					if ( !data && dataObj.method == 'paste' && dataTransfer && dataTransfer.getFilesCount() == 1 && latestId != dataTransfer.id ) {
						var file = dataTransfer.getFile( 0 );

						if ( CKEDITOR.tools.indexOf( supportedImageTypes, file.type ) != -1 ) {
							var fileReader = new FileReader();

							// Convert image file to img tag with base64 image.
							fileReader.addEventListener( 'load', function() {
								evt.data.dataValue = '<img src="' + fileReader.result + '" />';
								editor.fire( 'paste', evt.data );
							}, false );

							// Proceed with normal flow if reading file was aborted.
							fileReader.addEventListener( 'abort', function() {
								editor.fire( 'paste', evt.data );
							}, false );

							// Proceed with normal flow if reading file failed.
							fileReader.addEventListener( 'error', function() {
								editor.fire( 'paste', evt.data );
							}, false );

							fileReader.readAsDataURL( file );

							latestId = dataObj.dataTransfer.id;

							evt.stop();
						}
					}
				}, null, null, 1 );
			}

			editor.on( 'paste', function( evt ) {
				// Init `dataTransfer` if `paste` event was fired without it, so it will be always available.
				if ( !evt.data.dataTransfer ) {
					evt.data.dataTransfer = new CKEDITOR.plugins.clipboard.dataTransfer();
				}

				// If dataValue is already set (manually or by paste bin), so do not override it.
				if ( evt.data.dataValue ) {
					return;
				}

				var dataTransfer = evt.data.dataTransfer,
					// IE support only text data and throws exception if we try to get html data.
					// This html data object may also be empty if we drag content of the textarea.
					value = dataTransfer.getData( 'text/html' );

				if ( value ) {
					evt.data.dataValue = value;
					evt.data.type = 'html';
				} else {
					// Try to get text data otherwise.
					value = dataTransfer.getData( 'text/plain' );

					if ( value ) {
						evt.data.dataValue = editor.editable().transformPlainTextToHtml( value );
						evt.data.type = 'text';
					}
				}
			}, null, null, 1 );

			editor.on( 'paste', function( evt ) {
				var data = evt.data.dataValue,
					blockElements = CKEDITOR.dtd.$block;

				// Filter webkit garbage.
				if ( data.indexOf( 'Apple-' ) > -1 ) {
					// Replace special webkit's &nbsp; with simple space, because webkit
					// produces them even for normal spaces.
					data = data.replace( /<span class="Apple-converted-space">&nbsp;<\/span>/gi, ' ' );

					// Strip <span> around white-spaces when not in forced 'html' content type.
					// This spans are created only when pasting plain text into Webkit,
					// but for safety reasons remove them always.
					if ( evt.data.type != 'html' ) {
						data = data.replace( /<span class="Apple-tab-span"[^>]*>([^<]*)<\/span>/gi, function( all, spaces ) {
							// Replace tabs with 4 spaces like Fx does.
							return spaces.replace( /\t/g, '&nbsp;&nbsp; &nbsp;' );
						} );
					}

					// This br is produced only when copying & pasting HTML content.
					if ( data.indexOf( '<br class="Apple-interchange-newline">' ) > -1 ) {
						evt.data.startsWithEOL = 1;
						evt.data.preSniffing = 'html'; // Mark as not text.
						data = data.replace( /<br class="Apple-interchange-newline">/, '' );
					}

					// Remove all other classes.
					data = data.replace( /(<[^>]+) class="Apple-[^"]*"/gi, '$1' );
				}

				// Strip editable that was copied from inside. (https://dev.ckeditor.com/ticket/9534)
				if ( data.match( /^<[^<]+cke_(editable|contents)/i ) ) {
					var tmp,
						editable_wrapper,
						wrapper = new CKEDITOR.dom.element( 'div' );

					wrapper.setHtml( data );
					// Verify for sure and check for nested editor UI parts. (https://dev.ckeditor.com/ticket/9675)
					while ( wrapper.getChildCount() == 1 &&
							( tmp = wrapper.getFirst() ) &&
							tmp.type == CKEDITOR.NODE_ELEMENT &&	// Make sure first-child is element.
							( tmp.hasClass( 'cke_editable' ) || tmp.hasClass( 'cke_contents' ) ) ) {
						wrapper = editable_wrapper = tmp;
					}

					// If editable wrapper was found strip it and bogus <br> (added on FF).
					if ( editable_wrapper )
						data = editable_wrapper.getHtml().replace( /<br>$/i, '' );
				}

				if ( CKEDITOR.env.ie ) {
					// &nbsp; <p> -> <p> (br.cke-pasted-remove will be removed later)
					data = data.replace( /^&nbsp;(?: |\r\n)?<(\w+)/g, function( match, elementName ) {
						if ( elementName.toLowerCase() in blockElements ) {
							evt.data.preSniffing = 'html'; // Mark as not a text.
							return '<' + elementName;
						}
						return match;
					} );
				} else if ( CKEDITOR.env.webkit ) {
					// </p><div><br></div> -> </p><br>
					// We don't mark br, because this situation can happen for htmlified text too.
					data = data.replace( /<\/(\w+)><div><br><\/div>$/, function( match, elementName ) {
						if ( elementName in blockElements ) {
							evt.data.endsWithEOL = 1;
							return '</' + elementName + '>';
						}
						return match;
					} );
				} else if ( CKEDITOR.env.gecko ) {
					// Firefox adds bogus <br> when user pasted text followed by space(s).
					data = data.replace( /(\s)<br>$/, '$1' );
				}

				evt.data.dataValue = data;
			}, null, null, 3 );

			editor.on( 'paste', function( evt ) {
				var dataObj = evt.data,
					type = editor._.nextPasteType || dataObj.type,
					data = dataObj.dataValue,
					trueType,
					// Default is 'html'.
					defaultType = editor.config.clipboard_defaultContentType || 'html',
					transferType = dataObj.dataTransfer.getTransferType( editor ),
					isExternalPaste = transferType == CKEDITOR.DATA_TRANSFER_EXTERNAL,
					isActiveForcePAPT = editor.config.forcePasteAsPlainText === true;

				// If forced type is 'html' we don't need to know true data type.
				if ( type == 'html' || dataObj.preSniffing == 'html' ) {
					trueType = 'html';
				} else {
					trueType = recogniseContentType( data );
				}

				delete editor._.nextPasteType;

				// Unify text markup.
				if ( trueType == 'htmlifiedtext' ) {
					data = htmlifiedTextHtmlification( editor.config, data );
				}

				// Strip presentational markup & unify text markup.
				// Forced plain text (dialog or forcePAPT).
				// Note: we do not check dontFilter option in this case, because forcePAPT was implemented
				// before pasteFilter and pasteFilter is automatically used on Webkit&Blink since 4.5, so
				// forcePAPT should have priority as it had before 4.5.
				if ( type == 'text' && trueType == 'html' ) {
					data = filterContent( editor, data, filtersFactory.get( 'plain-text' ) );
				}
				// External paste and pasteFilter exists and filtering isn't disabled.
				// Or force filtering even for internal and cross-editor paste, when forcePAPT is active (#620).
				else if ( isExternalPaste && editor.pasteFilter && !dataObj.dontFilter || isActiveForcePAPT ) {
					data = filterContent( editor, data, editor.pasteFilter );
				}

				if ( dataObj.startsWithEOL ) {
					data = '<br data-cke-eol="1">' + data;
				}
				if ( dataObj.endsWithEOL ) {
					data += '<br data-cke-eol="1">';
				}

				if ( type == 'auto' ) {
					type = ( trueType == 'html' || defaultType == 'html' ) ? 'html' : 'text';
				}

				dataObj.type = type;
				dataObj.dataValue = data;
				delete dataObj.preSniffing;
				delete dataObj.startsWithEOL;
				delete dataObj.endsWithEOL;
			}, null, null, 6 );

			// Inserts processed data into the editor at the end of the
			// events chain.
			editor.on( 'paste', function( evt ) {
				var data = evt.data;
				if ( data.dataValue ) {
					editor.insertHtml( data.dataValue, data.type, data.range );

					// Defer 'afterPaste' so all other listeners for 'paste' will be fired first.
					// Fire afterPaste only if paste inserted some HTML.
					setTimeout( function() {
						editor.fire( 'afterPaste' );
					}, 0 );
				}
			}, null, null, 1000 );

			editor.on( 'pasteDialog', function( evt ) {
				// TODO it's possible that this setTimeout is not needed any more,
				// because of changes introduced in the same commit as this comment.
				// Editor.getClipboardData adds listener to the dialog's events which are
				// fired after a while (not like 'showDialog').
				setTimeout( function() {
					// Open default paste dialog.
					editor.openDialog( 'paste', evt.data );
				}, 0 );
			} );
		}
	} );

	function firePasteEvents( editor, data, withBeforePaste ) {
		if ( !data.type ) {
			data.type = 'auto';
		}

		if ( withBeforePaste ) {
			// Fire 'beforePaste' event so clipboard flavor get customized
			// by other plugins.
			if ( editor.fire( 'beforePaste', data ) === false )
				return false; // Event canceled
		}

		// Do not fire paste if there is no data (dataValue and dataTranfser are empty).
		// This check should be done after firing 'beforePaste' because for native paste
		// 'beforePaste' is by default fired even for empty clipboard.
		if ( !data.dataValue && data.dataTransfer.isEmpty() ) {
			return false;
		}

		if ( !data.dataValue ) {
			data.dataValue = '';
		}

		// Because of FF bug we need to use this hack, otherwise cursor is hidden
		// or it is not possible to move it (https://dev.ckeditor.com/ticket/12420).
		// Also, check that editor.toolbox exists, because the toolbar plugin might not be loaded (https://dev.ckeditor.com/ticket/13305).
		if ( CKEDITOR.env.gecko && data.method == 'drop' && editor.toolbox ) {
			editor.once( 'afterPaste', function() {
				editor.toolbox.focus();
			} );
		}

		return editor.fire( 'paste', data );
	}

	function initPasteClipboard( editor ) {
		var clipboard = CKEDITOR.plugins.clipboard,
			preventBeforePasteEvent = 0,
			preventPasteEvent = 0;

		addListeners();
		addButtonsCommands();

		/**
		 * Gets clipboard data by directly accessing the clipboard (IE only) or opening the paste dialog window.
		 *
		 *		editor.getClipboardData( function( data ) {
		 *			if ( data )
		 *				alert( data.type + ' ' + data.dataValue );
		 *		} );
		 *
		 * @member CKEDITOR.editor
		 * @param {Function/Object} callbackOrOptions For function, see the `callback` parameter documentation. The object was used before 4.7.0 with the `title` property, to set the paste dialog's title.
		 * @param {Function} callback A function that will be executed with the `data` property of the
		 * {@link CKEDITOR.editor#event-paste paste event} or `null` if none of the capturing methods succeeded.
		 * Since 4.7.0 the `callback` should be provided as a first argument, just like in the example above. This parameter will be removed in
		 * an upcoming major release.
		 */
		editor.getClipboardData = function( callbackOrOptions, callback ) {
			var beforePasteNotCanceled = false,
				dataType = 'auto';

			// Options are optional - args shift.
			if ( !callback ) {
				callback = callbackOrOptions;
				callbackOrOptions = null;
			}

			// Listen at the end of listeners chain to see if event wasn't canceled
			// and to retrieve modified data.type.
			editor.on( 'beforePaste', onBeforePaste, null, null, 1000 );

			// Listen with maximum priority to handle content before everyone else.
			// This callback will handle paste event that will be fired if direct
			// access to the clipboard succeed in IE.
			editor.on( 'paste', onPaste, null, null, 0 );

			// If command didn't succeed (only IE allows to access clipboard and only if
			// user agrees) invoke callback with null, meaning that paste is not blocked.
			if ( getClipboardDataDirectly() === false ) {
				// Direct access to the clipboard wasn't successful so remove listener.
				editor.removeListener( 'paste', onPaste );

				// If beforePaste was canceled do not open dialog.
				// Add listeners only if dialog really opened. 'pasteDialog' can be canceled.
				if ( editor._.forcePasteDialog && beforePasteNotCanceled && editor.fire( 'pasteDialog' ) ) {
					editor.on( 'pasteDialogCommit', onDialogCommit );

					// 'dialogHide' will be fired after 'pasteDialogCommit'.
					editor.on( 'dialogHide', function( evt ) {
						evt.removeListener();
						evt.data.removeListener( 'pasteDialogCommit', onDialogCommit );

						// Notify even if user canceled dialog (clicked 'cancel', ESC, etc).
						if ( !evt.data._.committed ) {
							callback( null );
						}
					} );
				} else {
					callback( null );
				}
			}

			function onPaste( evt ) {
				evt.removeListener();
				evt.cancel();
				callback( evt.data );
			}

			function onBeforePaste( evt ) {
				evt.removeListener();
				beforePasteNotCanceled = true;
				dataType = evt.data.type;
			}

			function onDialogCommit( evt ) {
				evt.removeListener();
				// Cancel pasteDialogCommit so paste dialog won't automatically fire
				// 'paste' evt by itself.
				evt.cancel();

				callback( {
					type: dataType,
					dataValue: evt.data.dataValue,
					dataTransfer: evt.data.dataTransfer,
					method: 'paste'
				} );
			}
		};

		function addButtonsCommands() {
			addButtonCommand( 'Cut', 'cut', createCutCopyCmd( 'cut' ), 10, 1 );
			addButtonCommand( 'Copy', 'copy', createCutCopyCmd( 'copy' ), 20, 4 );
			addButtonCommand( 'Paste', 'paste', createPasteCmd(), 30, 8 );

			// Force adding touchend handler to paste button (#595).
			if ( !editor._.pasteButtons ) {
				editor._.pasteButtons = [];
			}
			editor._.pasteButtons.push( 'Paste' );

			function addButtonCommand( buttonName, commandName, command, toolbarOrder, ctxMenuOrder ) {
				var lang = editor.lang.clipboard[ commandName ];

				editor.addCommand( commandName, command );
				editor.ui.addButton && editor.ui.addButton( buttonName, {
					label: lang,
					command: commandName,
					toolbar: 'clipboard,' + toolbarOrder
				} );

				// If the "menu" plugin is loaded, register the menu item.
				if ( editor.addMenuItems ) {
					editor.addMenuItem( commandName, {
						label: lang,
						command: commandName,
						group: 'clipboard',
						order: ctxMenuOrder
					} );
				}
			}
		}

		function addListeners() {
			editor.on( 'key', onKey );
			editor.on( 'contentDom', addPasteListenersToEditable );

			// For improved performance, we're checking the readOnly state on selectionChange instead of hooking a key event for that.
			editor.on( 'selectionChange', setToolbarStates );

			// If the "contextmenu" plugin is loaded, register the listeners.
			if ( editor.contextMenu ) {
				editor.contextMenu.addListener( function() {
					return {
						cut: stateFromNamedCommand( 'cut' ),
						copy: stateFromNamedCommand( 'copy' ),
						paste: stateFromNamedCommand( 'paste' )
					};
				} );

				// Adds 'touchend' integration with context menu paste item (#1347).
				var pasteListener = null;
				editor.on( 'menuShow', function() {
					// Remove previous listener.
					if ( pasteListener ) {
						pasteListener.removeListener();
						pasteListener = null;
					}

					// Attach new 'touchend' listeners to context menu paste items.
					var item = editor.contextMenu.findItemByCommandName( 'paste' );
					if ( item && item.element ) {
						pasteListener = item.element.on( 'touchend', function() {
							editor._.forcePasteDialog = true;
						} );
					}
				} );
			}

			// Detect if any of paste buttons was touched. In such case we assume that user is using
			// touch device and force displaying paste dialog (#595).
			if ( editor.ui.addButton ) {
				// Waiting for editor instance to be ready seems to be the most reliable way to
				// be sure that paste buttons are already created.
				editor.once( 'instanceReady', function() {
					if ( !editor._.pasteButtons ) {
						return;
					}

					CKEDITOR.tools.array.forEach( editor._.pasteButtons, function( name ) {
						var pasteButton = editor.ui.get( name );
						// Check if button was not removed by `removeButtons` config.
						if ( pasteButton ) {
							var buttonElement = CKEDITOR.document.getById( pasteButton._.id );

							if ( buttonElement ) {
								buttonElement.on( 'touchend', function() {
									editor._.forcePasteDialog = true;
								} );
							}
						}
					} );
				} );
			}
		}

		// Add events listeners to editable.
		function addPasteListenersToEditable() {
			var editable = editor.editable();

			if ( CKEDITOR.plugins.clipboard.isCustomCopyCutSupported ) {
				var initOnCopyCut = function( evt ) {
					// There shouldn't be anything to copy/cut when selection is collapsed (#869).
					if ( editor.getSelection().isCollapsed() ) {
						return;
					}

					// If user tries to cut in read-only editor, we must prevent default action (https://dev.ckeditor.com/ticket/13872).
					if ( !editor.readOnly || evt.name != 'cut' ) {
						clipboard.initPasteDataTransfer( evt, editor );
					}
					evt.data.preventDefault();
				};

				editable.on( 'copy', initOnCopyCut );
				editable.on( 'cut', initOnCopyCut );

				// Delete content with the low priority so one can overwrite cut data.
				editable.on( 'cut', function() {
					// If user tries to cut in read-only editor, we must prevent default action. (https://dev.ckeditor.com/ticket/13872)
					if ( !editor.readOnly ) {
						editor.extractSelectedHtml();
					}
				}, null, null, 999 );
			}

			// We'll be catching all pasted content in one line, regardless of whether
			// it's introduced by a document command execution (e.g. toolbar buttons) or
			// user paste behaviors (e.g. CTRL+V).
			editable.on( clipboard.mainPasteEvent, function( evt ) {
				if ( clipboard.mainPasteEvent == 'beforepaste' && preventBeforePasteEvent ) {
					return;
				}

				// If you've just asked yourself why preventPasteEventNow() is not here, but
				// in listener for CTRL+V and exec method of 'paste' command
				// you've asked the same question we did.
				//
				// THE ANSWER:
				//
				// First thing to notice - this answer makes sense only for IE,
				// because other browsers don't listen for 'paste' event.
				//
				// What would happen if we move preventPasteEventNow() here?
				// For:
				// * CTRL+V - IE fires 'beforepaste', so we prevent 'paste' and pasteDataFromClipboard(). OK.
				// * editor.execCommand( 'paste' ) - we fire 'beforepaste', so we prevent
				//		'paste' and pasteDataFromClipboard() and doc.execCommand( 'Paste' ). OK.
				// * native context menu - IE fires 'beforepaste', so we prevent 'paste', but unfortunately
				//		on IE we fail with pasteDataFromClipboard() here, because of... we don't know why, but
				//		we just fail, so... we paste nothing. FAIL.
				// * native menu bar - the same as for native context menu.
				//
				// But don't you know any way to distinguish first two cases from last two?
				// Only one - special flag set in CTRL+V handler and exec method of 'paste'
				// command. And that's what we did using preventPasteEventNow().

				pasteDataFromClipboard( evt );
			} );

			// It's not possible to clearly handle all four paste methods (ctrl+v, native menu bar
			// native context menu, editor's command) in one 'paste/beforepaste' event in IE.
			//
			// For ctrl+v & editor's command it's easy to handle pasting in 'beforepaste' listener,
			// so we do this. For another two methods it's better to use 'paste' event.
			//
			// 'paste' is always being fired after 'beforepaste' (except of weird one on opening native
			// context menu), so for two methods handled in 'beforepaste' we're canceling 'paste'
			// using preventPasteEvent state.
			//
			// 'paste' event in IE is being fired before getClipboardDataByPastebin executes its callback.
			//
			// QUESTION: Why didn't you handle all 4 paste methods in handler for 'paste'?
			//		Wouldn't this just be simpler?
			// ANSWER: Then we would have to evt.data.preventDefault() only for native
			//		context menu and menu bar pastes. The same with execIECommand().
			//		That would force us to mark CTRL+V and editor's paste command with
			//		special flag, other than preventPasteEvent. But we still would have to
			//		have preventPasteEvent for the second event fired by execIECommand.
			//		Code would be longer and not cleaner.
			if ( clipboard.mainPasteEvent == 'beforepaste' ) {
				editable.on( 'paste', function( evt ) {
					if ( preventPasteEvent ) {
						return;
					}

					// Cancel next 'paste' event fired by execIECommand( 'paste' )
					// at the end of this callback.
					preventPasteEventNow();

					// Prevent native paste.
					evt.data.preventDefault();

					pasteDataFromClipboard( evt );

					// Force IE to paste content into pastebin so pasteDataFromClipboard will work.
					execIECommand( 'paste' );
				} );

				// If mainPasteEvent is 'beforePaste' (IE before Edge),
				// dismiss the (wrong) 'beforepaste' event fired on context/toolbar menu open. (https://dev.ckeditor.com/ticket/7953)
				editable.on( 'contextmenu', preventBeforePasteEventNow, null, null, 0 );

				editable.on( 'beforepaste', function( evt ) {
					// Do not prevent event on CTRL+V and SHIFT+INS because it blocks paste (https://dev.ckeditor.com/ticket/11970).
					if ( evt.data && !evt.data.$.ctrlKey && !evt.data.$.shiftKey )
						preventBeforePasteEventNow();
				}, null, null, 0 );
			}

			editable.on( 'beforecut', function() {
				!preventBeforePasteEvent && fixCut( editor );
			} );

			var mouseupTimeout;

			// Use editor.document instead of editable in non-IEs for observing mouseup
			// since editable won't fire the event if selection process started within
			// iframe and ended out of the editor (https://dev.ckeditor.com/ticket/9851).
			editable.attachListener( CKEDITOR.env.ie ? editable : editor.document.getDocumentElement(), 'mouseup', function() {
				mouseupTimeout = setTimeout( setToolbarStates, 0 );
			} );

			// Make sure that deferred mouseup callback isn't executed after editor instance
			// had been destroyed. This may happen when editor.destroy() is called in parallel
			// with mouseup event (i.e. a button with onclick callback) (https://dev.ckeditor.com/ticket/10219).
			editor.on( 'destroy', function() {
				clearTimeout( mouseupTimeout );
			} );

			editable.on( 'keyup', setToolbarStates );
		}

		// Create object representing Cut or Copy commands.
		function createCutCopyCmd( type ) {
			return {
				type: type,
				canUndo: type == 'cut', // We can't undo copy to clipboard.
				startDisabled: true,
				fakeKeystroke: type == 'cut' ? CKEDITOR.CTRL + 88 /*X*/ :  CKEDITOR.CTRL + 67 /*C*/,
				exec: function() {
					// Attempts to execute the Cut and Copy operations.
					function tryToCutCopy( type ) {
						if ( CKEDITOR.env.ie )
							return execIECommand( type );

						// non-IEs part
						try {
							// Other browsers throw an error if the command is disabled.
							return editor.document.$.execCommand( type, false, null );
						} catch ( e ) {
							return false;
						}
					}

					this.type == 'cut' && fixCut();

					var success = tryToCutCopy( this.type );

					if ( !success ) {
						// Show cutError or copyError.
						editor.showNotification( editor.lang.clipboard[ this.type + 'Error' ] ); // jshint ignore:line
					}

					return success;
				}
			};
		}

		function createPasteCmd() {
			return {
				// Snapshots are done manually by editable.insertXXX methods.
				canUndo: false,
				async: true,
				fakeKeystroke: CKEDITOR.CTRL + 86 /*V*/,

				/**
				 * The default implementation of the paste command.
				 *
				 * @private
				 * @param {CKEDITOR.editor} editor An instance of the editor where the command is being executed.
				 * @param {Object/String} data If `data` is a string, then it is considered content that is being pasted.
				 * Otherwise it is treated as an object with options.
				 * @param {Boolean/String} [data.notification=true] Content for a notification shown after an unsuccessful
				 * paste attempt. If `false`, the notification will not be displayed. This parameter was added in 4.7.0.
				 * @param {String} [data.type='html'] The type of pasted content. There are two allowed values:
				 * * 'html'
				 * * 'text'
				 * @param {String/Object} data.dataValue Content being pasted. If this parameter is an object, it
				 * is supposed to be a `data` property of the {@link CKEDITOR.editor#paste} event.
				 * @param {CKEDITOR.plugins.clipboard.dataTransfer} data.dataTransfer Data transfer instance connected
				 * with the current paste action.
				 * @member CKEDITOR.editor.commands.paste
				 */
				exec: function( editor, data ) {
					data = typeof data !== 'undefined' && data !== null ? data : {};

					var cmd = this,
						notification = typeof data.notification !== 'undefined' ? data.notification : true,
						forcedType = data.type,
						keystroke = CKEDITOR.tools.keystrokeToString( editor.lang.common.keyboard,
							editor.getCommandKeystroke( this ) ),
						msg = typeof notification === 'string' ? notification : editor.lang.clipboard.pasteNotification
							.replace( /%1/, '<kbd aria-label="' + keystroke.aria + '">' + keystroke.display + '</kbd>' ),
						pastedContent = typeof data === 'string' ? data : data.dataValue;

					function callback( data, withBeforePaste ) {
						withBeforePaste = typeof withBeforePaste !== 'undefined' ? withBeforePaste : true;

						if ( data ) {
							data.method = 'paste';

							if ( !data.dataTransfer ) {
								data.dataTransfer = clipboard.initPasteDataTransfer();
							}

							firePasteEvents( editor, data, withBeforePaste );
						} else if ( notification && !editor._.forcePasteDialog ) {
							editor.showNotification( msg, 'info', editor.config.clipboard_notificationDuration );
						}

						// Reset dialog mode (#595).
						editor._.forcePasteDialog = false;

						editor.fire( 'afterCommandExec', {
							name: 'paste',
							command: cmd,
							returnValue: !!data
						} );
					}

					// Force type for the next paste. Do not force if `config.forcePasteAsPlainText` set to true or 'allow-word' (#1013).
					if ( forcedType && editor.config.forcePasteAsPlainText !== true && editor.config.forcePasteAsPlainText !== 'allow-word' ) {
						editor._.nextPasteType = forcedType;
					} else {
						delete editor._.nextPasteType;
					}

					if ( typeof pastedContent === 'string' ) {
						callback( {
							dataValue: pastedContent
						} );
					} else {
						editor.getClipboardData( callback );
					}
				}
			};
		}

		function preventPasteEventNow() {
			preventPasteEvent = 1;
			// For safety reason we should wait longer than 0/1ms.
			// We don't know how long execution of quite complex getClipboardData will take
			// and in for example 'paste' listener execCommand() (which fires 'paste') is called
			// after getClipboardData finishes.
			// Luckily, it's impossible to immediately fire another 'paste' event we want to handle,
			// because we only handle there native context menu and menu bar.
			setTimeout( function() {
				preventPasteEvent = 0;
			}, 100 );
		}

		function preventBeforePasteEventNow() {
			preventBeforePasteEvent = 1;
			setTimeout( function() {
				preventBeforePasteEvent = 0;
			}, 10 );
		}

		// Tries to execute any of the paste, cut or copy commands in IE. Returns a
		// boolean indicating that the operation succeeded.
		// @param {String} command *LOWER CASED* name of command ('paste', 'cut', 'copy').
		function execIECommand( command ) {
			var doc = editor.document,
				body = doc.getBody(),
				enabled = false,
				onExec = function() {
					enabled = true;
				};

			// The following seems to be the only reliable way to detect that
			// clipboard commands are enabled in IE. It will fire the
			// onpaste/oncut/oncopy events only if the security settings allowed
			// the command to execute.
			body.on( command, onExec );

			// IE7: document.execCommand has problem to paste into positioned element.
			if ( CKEDITOR.env.version > 7 ) {
				doc.$.execCommand( command );
			} else {
				doc.$.selection.createRange().execCommand( command );
			}

			body.removeListener( command, onExec );

			return enabled;
		}

		// Cutting off control type element in IE standards breaks the selection entirely. (https://dev.ckeditor.com/ticket/4881)
		function fixCut() {
			if ( !CKEDITOR.env.ie || CKEDITOR.env.quirks )
				return;

			var sel = editor.getSelection(),
				control, range, dummy;

			if ( ( sel.getType() == CKEDITOR.SELECTION_ELEMENT ) && ( control = sel.getSelectedElement() ) ) {
				range = sel.getRanges()[ 0 ];
				dummy = editor.document.createText( '' );
				dummy.insertBefore( control );
				range.setStartBefore( dummy );
				range.setEndAfter( control );
				sel.selectRanges( [ range ] );

				// Clear up the fix if the paste wasn't succeeded.
				setTimeout( function() {
					// Element still online?
					if ( control.getParent() ) {
						dummy.remove();
						sel.selectElement( control );
					}
				}, 0 );
			}
		}

		// Allow to peek clipboard content by redirecting the
		// pasting content into a temporary bin and grab the content of it.
		function getClipboardDataByPastebin( evt, callback ) {
			var doc = editor.document,
				editable = editor.editable(),
				cancel = function( evt ) {
					evt.cancel();
				},
				blurListener;

			// Avoid recursions on 'paste' event or consequent paste too fast. (https://dev.ckeditor.com/ticket/5730)
			if ( doc.getById( 'cke_pastebin' ) )
				return;

			var sel = editor.getSelection();
			var bms = sel.createBookmarks();

			// https://dev.ckeditor.com/ticket/11384. On IE9+ we use native selectionchange (i.e. editor#selectionCheck) to cache the most
			// recent selection which we then lock on editable blur. See selection.js for more info.
			// selectionchange fired before getClipboardDataByPastebin() cached selection
			// before creating bookmark (cached selection will be invalid, because bookmarks modified the DOM),
			// so we need to fire selectionchange one more time, to store current seleciton.
			// Selection will be locked when we focus pastebin.
			if ( CKEDITOR.env.ie )
				sel.root.fire( 'selectionchange' );

			// Create container to paste into.
			// For rich content we prefer to use "body" since it holds
			// the least possibility to be splitted by pasted content, while this may
			// breaks the text selection on a frame-less editable, "div" would be
			// the best one in that case.
			// In another case on old IEs moving the selection into a "body" paste bin causes error panic.
			// Body can't be also used for Opera which fills it with <br>
			// what is indistinguishable from pasted <br> (copying <br> in Opera isn't possible,
			// but it can be copied from other browser).
			var pastebin = new CKEDITOR.dom.element(
				( CKEDITOR.env.webkit || editable.is( 'body' ) ) && !CKEDITOR.env.ie ? 'body' : 'div', doc );

			pastebin.setAttributes( {
				id: 'cke_pastebin',
				'data-cke-temp': '1'
			} );

			var containerOffset = 0,
				offsetParent,
				win = doc.getWindow();

			if ( CKEDITOR.env.webkit ) {
				// It's better to paste close to the real paste destination, so inherited styles
				// (which Webkits will try to compensate by styling span) differs less from the destination's one.
				editable.append( pastebin );
				// Style pastebin like .cke_editable, to minimize differences between origin and destination. (https://dev.ckeditor.com/ticket/9754)
				pastebin.addClass( 'cke_editable' );

				// Compensate position of offsetParent.
				if ( !editable.is( 'body' ) ) {
					// We're not able to get offsetParent from pastebin (body element), so check whether
					// its parent (editable) is positioned.
					if ( editable.getComputedStyle( 'position' ) != 'static' )
						offsetParent = editable;
					// And if not - safely get offsetParent from editable.
					else
						offsetParent = CKEDITOR.dom.element.get( editable.$.offsetParent );

					containerOffset = offsetParent.getDocumentPosition().y;
				}
			} else {
				// Opera and IE doesn't allow to append to html element.
				editable.getAscendant( CKEDITOR.env.ie ? 'body' : 'html', 1 ).append( pastebin );
			}

			pastebin.setStyles( {
				position: 'absolute',
				// Position the bin at the top (+10 for safety) of viewport to avoid any subsequent document scroll.
				top: ( win.getScrollPosition().y - containerOffset + 10 ) + 'px',
				width: '1px',
				// Caret has to fit in that height, otherwise browsers like Chrome & Opera will scroll window to show it.
				// Set height equal to viewport's height - 20px (safety gaps), minimum 1px.
				height: Math.max( 1, win.getViewPaneSize().height - 20 ) + 'px',
				overflow: 'hidden',
				// Reset styles that can mess up pastebin position.
				margin: 0,
				padding: 0
			} );

			// Paste fails in Safari when the body tag has 'user-select: none'. (https://dev.ckeditor.com/ticket/12506)
			if ( CKEDITOR.env.safari )
				pastebin.setStyles( CKEDITOR.tools.cssVendorPrefix( 'user-select', 'text' ) );

			// Check if the paste bin now establishes new editing host.
			var isEditingHost = pastebin.getParent().isReadOnly();

			if ( isEditingHost ) {
				// Hide the paste bin.
				pastebin.setOpacity( 0 );
				// And make it editable.
				pastebin.setAttribute( 'contenteditable', true );
			}
			// Transparency is not enough since positioned non-editing host always shows
			// resize handler, pull it off the screen instead.
			else {
				pastebin.setStyle( editor.config.contentsLangDirection == 'ltr' ? 'left' : 'right', '-10000px' );
			}

			editor.on( 'selectionChange', cancel, null, null, 0 );

			// Webkit fill fire blur on editable when moving selection to
			// pastebin (if body is used). Cancel it because it causes incorrect
			// selection lock in case of inline editor (https://dev.ckeditor.com/ticket/10644).
			// The same seems to apply to Firefox (https://dev.ckeditor.com/ticket/10787).
			if ( CKEDITOR.env.webkit || CKEDITOR.env.gecko )
				blurListener = editable.once( 'blur', cancel, null, null, -100 );

			// Temporarily move selection to the pastebin.
			isEditingHost && pastebin.focus();
			var range = new CKEDITOR.dom.range( pastebin );
			range.selectNodeContents( pastebin );
			var selPastebin = range.select();

			// If non-native paste is executed, IE will open security alert and blur editable.
			// Editable will then lock selection inside itself and after accepting security alert
			// this selection will be restored. We overwrite stored selection, so it's restored
			// in pastebin. (https://dev.ckeditor.com/ticket/9552)
			if ( CKEDITOR.env.ie ) {
				blurListener = editable.once( 'blur', function() {
					editor.lockSelection( selPastebin );
				} );
			}

			var scrollTop = CKEDITOR.document.getWindow().getScrollPosition().y;

			// Wait a while and grab the pasted contents.
			setTimeout( function() {
				// Restore main window's scroll position which could have been changed
				// by browser in cases described in https://dev.ckeditor.com/ticket/9771.
				if ( CKEDITOR.env.webkit )
					CKEDITOR.document.getBody().$.scrollTop = scrollTop;

				// Blur will be fired only on non-native paste. In other case manually remove listener.
				blurListener && blurListener.removeListener();

				// Restore properly the document focus. (https://dev.ckeditor.com/ticket/8849)
				if ( CKEDITOR.env.ie )
					editable.focus();

				// IE7: selection must go before removing pastebin. (https://dev.ckeditor.com/ticket/8691)
				sel.selectBookmarks( bms );
				pastebin.remove();

				// Grab the HTML contents.
				// We need to look for a apple style wrapper on webkit it also adds
				// a div wrapper if you copy/paste the body of the editor.
				// Remove hidden div and restore selection.
				var bogusSpan;
				if ( CKEDITOR.env.webkit && ( bogusSpan = pastebin.getFirst() ) && ( bogusSpan.is && bogusSpan.hasClass( 'Apple-style-span' ) ) )
					pastebin = bogusSpan;

				editor.removeListener( 'selectionChange', cancel );
				callback( pastebin.getHtml() );
			}, 0 );
		}

		// Try to get content directly on IE from clipboard, without native event
		// being fired before. In other words - synthetically get clipboard data, if it's possible.
		// mainPasteEvent will be fired, so if forced native paste:
		// * worked, getClipboardDataByPastebin will grab it,
		// * didn't work, dataValue and dataTransfer will be empty and editor#paste won't be fired.
		// Clipboard data can be accessed directly only on IEs older than Edge.
		// On other browsers we should fire beforePaste event and return false.
		function getClipboardDataDirectly() {
			if ( clipboard.mainPasteEvent == 'paste' ) {
				editor.fire( 'beforePaste', { type: 'auto', method: 'paste' } );
				return false;
			}

			// Prevent IE from pasting at the begining of the document.
			editor.focus();

			// Command will be handled by 'beforepaste', but as
			// execIECommand( 'paste' ) will fire also 'paste' event
			// we're canceling it.
			preventPasteEventNow();

			// https://dev.ckeditor.com/ticket/9247: Lock focus to prevent IE from hiding toolbar for inline editor.
			var focusManager = editor.focusManager;
			focusManager.lock();

			if ( editor.editable().fire( clipboard.mainPasteEvent ) && !execIECommand( 'paste' ) ) {
				focusManager.unlock();
				return false;
			}
			focusManager.unlock();

			return true;
		}

		// Listens for some clipboard related keystrokes, so they get customized.
		// Needs to be bind to keydown event.
		function onKey( event ) {
			if ( editor.mode != 'wysiwyg' )
				return;

			switch ( event.data.keyCode ) {
				// Paste
				case CKEDITOR.CTRL + 86: // CTRL+V
				case CKEDITOR.SHIFT + 45: // SHIFT+INS
					var editable = editor.editable();

					// Cancel 'paste' event because ctrl+v is for IE handled
					// by 'beforepaste'.
					preventPasteEventNow();

					// Simulate 'beforepaste' event for all browsers using 'paste' as main event.
					if ( clipboard.mainPasteEvent == 'paste' ) {
						editable.fire( 'beforepaste' );
					}

					return;

					// Cut
				case CKEDITOR.CTRL + 88: // CTRL+X
				case CKEDITOR.SHIFT + 46: // SHIFT+DEL
					// Save Undo snapshot.
					editor.fire( 'saveSnapshot' ); // Save before cut
					setTimeout( function() {
						editor.fire( 'saveSnapshot' ); // Save after cut
					}, 50 ); // OSX is slow (https://dev.ckeditor.com/ticket/11416).
			}
		}

		function pasteDataFromClipboard( evt ) {
			// Default type is 'auto', but can be changed by beforePaste listeners.
			var eventData = {
					type: 'auto',
					method: 'paste',
					dataTransfer: clipboard.initPasteDataTransfer( evt )
				};

			eventData.dataTransfer.cacheData();

			// Fire 'beforePaste' event so clipboard flavor get customized by other plugins.
			// If 'beforePaste' is canceled continue executing getClipboardDataByPastebin and then do nothing
			// (do not fire 'paste', 'afterPaste' events). This way we can grab all - synthetically
			// and natively pasted content and prevent its insertion into editor
			// after canceling 'beforePaste' event.
			var beforePasteNotCanceled = editor.fire( 'beforePaste', eventData ) !== false;

			// Do not use paste bin if the browser let us get HTML or files from dataTranfer.
			if ( beforePasteNotCanceled && clipboard.canClipboardApiBeTrusted( eventData.dataTransfer, editor ) ) {
				evt.data.preventDefault();
				setTimeout( function() {
					firePasteEvents( editor, eventData );
				}, 0 );
			} else {
				getClipboardDataByPastebin( evt, function( data ) {
					// Clean up.
					eventData.dataValue = data.replace( /<span[^>]+data-cke-bookmark[^<]*?<\/span>/ig, '' );

					// Fire remaining events (without beforePaste)
					beforePasteNotCanceled && firePasteEvents( editor, eventData );
				} );
			}
		}

		function setToolbarStates() {
			if ( editor.mode != 'wysiwyg' )
				return;

			var pasteState = stateFromNamedCommand( 'paste' );

			editor.getCommand( 'cut' ).setState( stateFromNamedCommand( 'cut' ) );
			editor.getCommand( 'copy' ).setState( stateFromNamedCommand( 'copy' ) );
			editor.getCommand( 'paste' ).setState( pasteState );
			editor.fire( 'pasteState', pasteState );
		}

		function stateFromNamedCommand( command ) {
			var selection = editor.getSelection(),
				range = selection && selection.getRanges()[ 0 ],
				// We need to correctly update toolbar states on readOnly (#2775).
				inReadOnly = editor.readOnly || ( range && range.checkReadOnly() );

			if ( inReadOnly && command in { paste: 1, cut: 1 } ) {
				return CKEDITOR.TRISTATE_DISABLED;
			}

			if ( command == 'paste' ) {
				return CKEDITOR.TRISTATE_OFF;
			}

			// Cut, copy - check if the selection is not empty.
			var sel = editor.getSelection(),
				ranges = sel.getRanges(),
				selectionIsEmpty = sel.getType() == CKEDITOR.SELECTION_NONE || ( ranges.length == 1 && ranges[ 0 ].collapsed );

			return selectionIsEmpty ? CKEDITOR.TRISTATE_DISABLED : CKEDITOR.TRISTATE_OFF;
		}
	}

	// Returns:
	// * 'htmlifiedtext' if content looks like transformed by browser from plain text.
	//		See clipboard/paste.html TCs for more info.
	// * 'html' if it is not 'htmlifiedtext'.
	function recogniseContentType( data ) {
		if ( CKEDITOR.env.webkit ) {
			// Plain text or ( <div><br></div> and text inside <div> ).
			if ( !data.match( /^[^<]*$/g ) && !data.match( /^(<div><br( ?\/)?><\/div>|<div>[^<]*<\/div>)*$/gi ) )
				return 'html';
		} else if ( CKEDITOR.env.ie ) {
			// Text and <br> or ( text and <br> in <p> - paragraphs can be separated by new \r\n ).
			if ( !data.match( /^([^<]|<br( ?\/)?>)*$/gi ) && !data.match( /^(<p>([^<]|<br( ?\/)?>)*<\/p>|(\r\n))*$/gi ) )
				return 'html';
		} else if ( CKEDITOR.env.gecko ) {
			// Text or <br>.
			if ( !data.match( /^([^<]|<br( ?\/)?>)*$/gi ) )
				return 'html';
		} else {
			return 'html';
		}

		return 'htmlifiedtext';
	}

	// This function transforms what browsers produce when
	// pasting plain text into editable element (see clipboard/paste.html TCs
	// for more info) into correct HTML (similar to that produced by text2Html).
	function htmlifiedTextHtmlification( config, data ) {
		function repeatParagraphs( repeats ) {
			// Repeat blocks floor((n+1)/2) times.
			// Even number of repeats - add <br> at the beginning of last <p>.
			return CKEDITOR.tools.repeat( '</p><p>', ~~( repeats / 2 ) ) + ( repeats % 2 == 1 ? '<br>' : '' );
		}

			// Replace adjacent white-spaces (EOLs too - Fx sometimes keeps them) with one space.
			// We have to skip \u3000 (IDEOGRAPHIC SPACE) character - it's special space character correctly rendered by the browsers (#1321).
		data = data.replace( /(?!\u3000)\s+/g, ' ' )
			// Remove spaces from between tags.
			.replace( /> +</g, '><' )
			// Normalize XHTML syntax and upper cased <br> tags.
			.replace( /<br ?\/>/gi, '<br>' );

		// IE - lower cased tags.
		data = data.replace( /<\/?[A-Z]+>/g, function( match ) {
			return match.toLowerCase();
		} );

		// Don't touch single lines (no <br|p|div>) - nothing to do here.
		if ( data.match( /^[^<]$/ ) )
			return data;

		// Webkit.
		if ( CKEDITOR.env.webkit && data.indexOf( '<div>' ) > -1 ) {
				// One line break at the beginning - insert <br>
			data = data.replace( /^(<div>(<br>|)<\/div>)(?!$|(<div>(<br>|)<\/div>))/g, '<br>' )
				// Two or more - reduce number of new lines by one.
				.replace( /^(<div>(<br>|)<\/div>){2}(?!$)/g, '<div></div>' );

			// Two line breaks create one paragraph in Webkit.
			if ( data.match( /<div>(<br>|)<\/div>/ ) ) {
				data = '<p>' + data.replace( /(<div>(<br>|)<\/div>)+/g, function( match ) {
					return repeatParagraphs( match.split( '</div><div>' ).length + 1 );
				} ) + '</p>';
			}

			// One line break create br.
			data = data.replace( /<\/div><div>/g, '<br>' );

			// Remove remaining divs.
			data = data.replace( /<\/?div>/g, '' );
		}

		// Opera and Firefox and enterMode != BR.
		if ( CKEDITOR.env.gecko && config.enterMode != CKEDITOR.ENTER_BR ) {
			// Remove bogus <br> - Fx generates two <brs> for one line break.
			// For two line breaks it still produces two <brs>, but it's better to ignore this case than the first one.
			if ( CKEDITOR.env.gecko )
				data = data.replace( /^<br><br>$/, '<br>' );

			// This line satisfy edge case when for Opera we have two line breaks
			//data = data.replace( /)

			if ( data.indexOf( '<br><br>' ) > -1 ) {
				// Two line breaks create one paragraph, three - 2, four - 3, etc.
				data = '<p>' + data.replace( /(<br>){2,}/g, function( match ) {
					return repeatParagraphs( match.length / 4 );
				} ) + '</p>';
			}
		}

		return switchEnterMode( config, data );
	}

	function filtersFactoryFactory( editor ) {
		var filters = {};

		function setUpTags() {
			var tags = {};

			for ( var tag in CKEDITOR.dtd ) {
				if ( tag.charAt( 0 ) != '$' && tag != 'div' && tag != 'span' ) {
					tags[ tag ] = 1;
				}
			}

			return tags;
		}

		function createSemanticContentFilter() {
			var filter = new CKEDITOR.filter( editor, {} );

			filter.allow( {
				$1: {
					elements: setUpTags(),
					attributes: true,
					styles: false,
					classes: false
				}
			} );

			return filter;
		}

		return {
			get: function( type ) {
				if ( type == 'plain-text' ) {
					// Does this look confusing to you? Did we forget about enter mode?
					// It is a trick that let's us creating one filter for edidtor, regardless of its
					// activeEnterMode (which as the name indicates can change during runtime).
					//
					// How does it work?
					// The active enter mode is passed to the filter.applyTo method.
					// The filter first marks all elements except <br> as disallowed and then tries to remove
					// them. However, it cannot remove e.g. a <p> element completely, because it's a basic structural element,
					// so it tries to replace it with an element created based on the active enter mode, eventually doing nothing.
					//
					// Now you can sleep well.
					return filters.plainText || ( filters.plainText = new CKEDITOR.filter( editor, 'br' ) );
				} else if ( type == 'semantic-content' ) {
					return filters.semanticContent || ( filters.semanticContent = createSemanticContentFilter() );
				} else if ( type ) {
					// Create filter based on rules (string or object).
					return new CKEDITOR.filter( editor, type );
				}

				return null;
			}
		};
	}

	function filterContent( editor, data, filter ) {
		var fragment = CKEDITOR.htmlParser.fragment.fromHtml( data ),
			writer = new CKEDITOR.htmlParser.basicWriter();

		filter.applyTo( fragment, true, false, editor.activeEnterMode );
		fragment.writeHtml( writer );

		return writer.getHtml();
	}

	function switchEnterMode( config, data ) {
		if ( config.enterMode == CKEDITOR.ENTER_BR ) {
			data = data.replace( /(<\/p><p>)+/g, function( match ) {
				return CKEDITOR.tools.repeat( '<br>', match.length / 7 * 2 );
			} ).replace( /<\/?p>/g, '' );
		} else if ( config.enterMode == CKEDITOR.ENTER_DIV ) {
			data = data.replace( /<(\/)?p>/g, '<$1div>' );
		}

		return data;
	}

	function preventDefaultSetDropEffectToNone( evt ) {
		evt.data.preventDefault();
		evt.data.$.dataTransfer.dropEffect = 'none';
	}

	function initDragDrop( editor ) {
		var clipboard = CKEDITOR.plugins.clipboard;

		editor.on( 'contentDom', function() {
			var editable = editor.editable(),
				dropTarget = CKEDITOR.plugins.clipboard.getDropTarget( editor ),
				top = editor.ui.space( 'top' ),
				bottom = editor.ui.space( 'bottom' );

			// -------------- DRAGOVER TOP & BOTTOM --------------

			// Not allowing dragging on toolbar and bottom (https://dev.ckeditor.com/ticket/12613).
			clipboard.preventDefaultDropOnElement( top );
			clipboard.preventDefaultDropOnElement( bottom );

			// -------------- DRAGSTART --------------
			// Listed on dragstart to mark internal and cross-editor drag & drop
			// and save range and selected HTML.

			editable.attachListener( dropTarget, 'dragstart', fireDragEvent );

			// Make sure to reset data transfer (in case dragend was not called or was canceled).
			editable.attachListener( editor, 'dragstart', clipboard.resetDragDataTransfer, clipboard, null, 1 );

			// Create a dataTransfer object and save it globally.
			editable.attachListener( editor, 'dragstart', function( evt ) {
				clipboard.initDragDataTransfer( evt, editor );
			}, null, null, 2 );

			editable.attachListener( editor, 'dragstart', function() {
				// Save drag range globally for cross editor D&D.
				var dragRange = clipboard.dragRange = editor.getSelection().getRanges()[ 0 ];

				// Store number of children, so we can later tell if any text node was split on drop. (https://dev.ckeditor.com/ticket/13011, https://dev.ckeditor.com/ticket/13447)
				if ( CKEDITOR.env.ie && CKEDITOR.env.version < 10 ) {
					clipboard.dragStartContainerChildCount = dragRange ? getContainerChildCount( dragRange.startContainer ) : null;
					clipboard.dragEndContainerChildCount = dragRange ? getContainerChildCount( dragRange.endContainer ) : null;
				}
			}, null, null, 100 );

			// -------------- DRAGEND --------------
			// Clean up on dragend.

			editable.attachListener( dropTarget, 'dragend', fireDragEvent );

			// Init data transfer if someone wants to use it in dragend.
			editable.attachListener( editor, 'dragend', clipboard.initDragDataTransfer, clipboard, null, 1 );

			// When drag & drop is done we need to reset dataTransfer so the future
			// external drop will be not recognize as internal.
			editable.attachListener( editor, 'dragend', clipboard.resetDragDataTransfer, clipboard, null, 100 );

			// -------------- DRAGOVER --------------
			// We need to call preventDefault on dragover because otherwise if
			// we drop image it will overwrite document.

			editable.attachListener( dropTarget, 'dragover', function( evt ) {
				// Edge requires this handler to have `preventDefault()` regardless of the situation.
				if ( CKEDITOR.env.edge ) {
					evt.data.preventDefault();
					return;
				}

				var target = evt.data.getTarget();

				// Prevent reloading page when dragging image on empty document (https://dev.ckeditor.com/ticket/12619).
				if ( target && target.is && target.is( 'html' ) ) {
					evt.data.preventDefault();
					return;
				}

				// If we do not prevent default dragover on IE the file path
				// will be loaded and we will lose content. On the other hand
				// if we prevent it the cursor will not we shown, so we prevent
				// dragover only on IE, on versions which support file API and only
				// if the event contains files.
				if ( CKEDITOR.env.ie &&
					CKEDITOR.plugins.clipboard.isFileApiSupported &&
					evt.data.$.dataTransfer.types.contains( 'Files' ) ) {
					evt.data.preventDefault();
				}
			} );

			// -------------- DROP --------------

			editable.attachListener( dropTarget, 'drop', function( evt ) {
				// Do nothing if event was already prevented. (https://dev.ckeditor.com/ticket/13879)
				if ( evt.data.$.defaultPrevented ) {
					return;
				}

				// Cancel native drop.
				evt.data.preventDefault();

				var target = evt.data.getTarget(),
					readOnly = target.isReadOnly();

				// Do nothing if drop on non editable element (https://dev.ckeditor.com/ticket/13015).
				// The <html> tag isn't editable (body is), but we want to allow drop on it
				// (so it is possible to drop below editor contents).
				if ( readOnly && !( target.type == CKEDITOR.NODE_ELEMENT && target.is( 'html' ) ) ) {
					return;
				}

				// Getting drop position is one of the most complex parts.
				var dropRange = clipboard.getRangeAtDropPosition( evt, editor ),
					dragRange = clipboard.dragRange;

				// Do nothing if it was not possible to get drop range.
				if ( !dropRange ) {
					return;
				}

				// Fire drop.
				fireDragEvent( evt, dragRange, dropRange  );
			}, null, null, 9999 );

			// Create dataTransfer or get it, if it was created before.
			editable.attachListener( editor, 'drop', clipboard.initDragDataTransfer, clipboard, null, 1 );

			// Execute drop action, fire paste.
			editable.attachListener( editor, 'drop', function( evt ) {
				var data = evt.data;

				if ( !data ) {
					return;
				}

				// Let user modify drag and drop range.
				var dropRange = data.dropRange,
					dragRange = data.dragRange,
					dataTransfer = data.dataTransfer;

				if ( dataTransfer.getTransferType( editor ) == CKEDITOR.DATA_TRANSFER_INTERNAL ) {
					// Execute drop with a timeout because otherwise selection, after drop,
					// on IE is in the drag position, instead of drop position.
					setTimeout( function() {
						clipboard.internalDrop( dragRange, dropRange, dataTransfer, editor );
					}, 0 );
				} else if ( dataTransfer.getTransferType( editor ) == CKEDITOR.DATA_TRANSFER_CROSS_EDITORS ) {
					crossEditorDrop( dragRange, dropRange, dataTransfer );
				} else {
					externalDrop( dropRange, dataTransfer );
				}
			}, null, null, 9999 );

			// Cross editor drag and drop (drag in one Editor and drop in the other).
			function crossEditorDrop( dragRange, dropRange, dataTransfer ) {
				// Paste event should be fired before delete contents because otherwise
				// Chrome have a problem with drop range (Chrome split the drop
				// range container so the offset is bigger then container length).
				dropRange.select();
				firePasteEvents( editor, { dataTransfer: dataTransfer, method: 'drop' }, 1 );

				// Remove dragged content and make a snapshot.
				dataTransfer.sourceEditor.fire( 'saveSnapshot' );

				dataTransfer.sourceEditor.editable().extractHtmlFromRange( dragRange );

				// Make some selection before saving snapshot, otherwise error will be thrown, because
				// there will be no valid selection after content is removed.
				dataTransfer.sourceEditor.getSelection().selectRanges( [ dragRange ] );
				dataTransfer.sourceEditor.fire( 'saveSnapshot' );
			}

			// Drop from external source.
			function externalDrop( dropRange, dataTransfer ) {
				// Paste content into the drop position.
				dropRange.select();

				firePasteEvents( editor, { dataTransfer: dataTransfer, method: 'drop' }, 1 );

				// Usually we reset DataTranfer on dragend,
				// but dragend is called on the same element as dragstart
				// so it will not be called on on external drop.
				clipboard.resetDragDataTransfer();
			}

			// Fire drag/drop events (dragstart, dragend, drop).
			function fireDragEvent( evt, dragRange, dropRange ) {
				var eventData = {
						$: evt.data.$,
						target: evt.data.getTarget()
					};

				if ( dragRange ) {
					eventData.dragRange = dragRange;
				}
				if ( dropRange ) {
					eventData.dropRange = dropRange;
				}

				if ( editor.fire( evt.name, eventData ) === false ) {
					evt.data.preventDefault();
				}
			}

			function getContainerChildCount( container ) {
				if ( container.type != CKEDITOR.NODE_ELEMENT ) {
					container = container.getParent();
				}

				return container.getChildCount();
			}
		} );
	}

	/**
	 * @singleton
	 * @class CKEDITOR.plugins.clipboard
	 */
	CKEDITOR.plugins.clipboard = {
		/**
		 * True if the environment allows to set data on copy or cut manually. This value is false in IE, because this browser
		 * shows the security dialog window when the script tries to set clipboard data and on iOS, because custom data is
		 * not saved to clipboard there.
		 *
		 * @since 4.5.0
		 * @readonly
		 * @property {Boolean}
		 */
		isCustomCopyCutSupported: ( !CKEDITOR.env.ie || CKEDITOR.env.version >= 16 ) && !CKEDITOR.env.iOS,

		/**
		 * True if the environment supports MIME types and custom data types in dataTransfer/cliboardData getData/setData methods.
		 *
		 * @since 4.5.0
		 * @readonly
		 * @property {Boolean}
		 */
		isCustomDataTypesSupported: !CKEDITOR.env.ie || CKEDITOR.env.version >= 16,

		/**
		 * True if the environment supports File API.
		 *
		 * @since 4.5.0
		 * @readonly
		 * @property {Boolean}
		 */
		isFileApiSupported: !CKEDITOR.env.ie || CKEDITOR.env.version > 9,

		/**
		 * Main native paste event editable should listen to.
		 *
		 * **Note:** Safari does not like the {@link CKEDITOR.editor#beforePaste} event &mdash; it sometimes does not
		 * handle <kbd>Ctrl+C</kbd> properly. This is probably caused by some race condition between events.
		 * Chrome, Firefox and Edge work well with both events, so it is better to use {@link CKEDITOR.editor#paste}
		 * which will handle pasting from e.g. browsers' menu bars.
		 * IE7/8 does not like the {@link CKEDITOR.editor#paste} event for which it is throwing random errors.
		 *
		 * @since 4.5.0
		 * @readonly
		 * @property {String}
		 */
		mainPasteEvent: ( CKEDITOR.env.ie && !CKEDITOR.env.edge ) ? 'beforepaste' : 'paste',

		/**
		 * Adds a new paste button to the editor.
		 *
		 * This method should be called for buttons that should display the Paste Dialog fallback in mobile environments.
		 * See [the rationale](https://github.com/ckeditor/ckeditor-dev/issues/595#issuecomment-345971174) for more
		 * details.
		 *
		 * @since 4.9.0
		 * @param {CKEDITOR.editor} editor The editor instance.
		 * @param {String} name Name of the button.
		 * @param {Object} definition Definition of the button.
		 */
		addPasteButton: function( editor, name, definition ) {
			if ( !editor.ui.addButton ) {
				return;
			}

			editor.ui.addButton( name, definition );

			if ( !editor._.pasteButtons ) {
				editor._.pasteButtons = [];
			}
			editor._.pasteButtons.push( name );
		},

		/**
		 * Returns `true` if it is expected that a browser provides HTML data through the Clipboard API.
		 * If not, this method returns `false` and as a result CKEditor will use the paste bin. Read more in
		 * the [Clipboard Integration](https://ckeditor.com/docs/ckeditor4/latest/guide/dev_clipboard.html#clipboard-api) guide.
		 *
		 * @since 4.5.2
		 * @returns {Boolean}
		 */
		canClipboardApiBeTrusted: function( dataTransfer, editor ) {
			// If it's an internal or cross-editor data transfer, then it means that custom cut/copy/paste support works
			// and that the data were put manually on the data transfer so we can be sure that it's available.
			if ( dataTransfer.getTransferType( editor ) != CKEDITOR.DATA_TRANSFER_EXTERNAL ) {
				return true;
			}

			// In Chrome we can trust Clipboard API, with the exception of Chrome on Android (in both - mobile and desktop modes), where
			// clipboard API is not available so we need to check it (https://dev.ckeditor.com/ticket/13187).
			if ( CKEDITOR.env.chrome && !dataTransfer.isEmpty() ) {
				return true;
			}

			// Because of a Firefox bug HTML data are not available in some cases (e.g. paste from Word), in such cases we
			// need to use the pastebin (https://dev.ckeditor.com/ticket/13528, https://bugzilla.mozilla.org/show_bug.cgi?id=1183686).
			if ( CKEDITOR.env.gecko && ( dataTransfer.getData( 'text/html' ) || dataTransfer.getFilesCount() ) ) {
				return true;
			}

			// Safari fixed clipboard in 10.1 (https://bugs.webkit.org/show_bug.cgi?id=19893) (https://dev.ckeditor.com/ticket/16982).
			// However iOS version still doesn't work well enough (https://bugs.webkit.org/show_bug.cgi?id=19893#c34).
			if ( CKEDITOR.env.safari && CKEDITOR.env.version >= 603 && !CKEDITOR.env.iOS ) {
				return true;
			}

			// Edge 15 added support for Clipboard API
			// (https://wpdev.uservoice.com/forums/257854-microsoft-edge-developer/suggestions/6515107-clipboard-api), however it is
			// usable for our case starting from Edge 16 (#468).
			if ( CKEDITOR.env.edge && CKEDITOR.env.version >= 16 ) {
				return true;
			}

			// In older Safari and IE HTML data is not available through the Clipboard API.
			// In older Edge version things are also a bit messy -
			// https://connect.microsoft.com/IE/feedback/details/1572456/edge-clipboard-api-text-html-content-messed-up-in-event-clipboarddata
			// It is safer to use the paste bin in unknown cases.
			return false;
		},

		/**
		 * Returns the element that should be used as the target for the drop event.
		 *
		 * @since 4.5.0
		 * @param {CKEDITOR.editor} editor The editor instance.
		 * @returns {CKEDITOR.dom.domObject} the element that should be used as the target for the drop event.
		 */
		getDropTarget: function( editor ) {
			var editable = editor.editable();

			// https://dev.ckeditor.com/ticket/11123 Firefox needs to listen on document, because otherwise event won't be fired.
			// https://dev.ckeditor.com/ticket/11086 IE8 cannot listen on document.
			if ( ( CKEDITOR.env.ie && CKEDITOR.env.version < 9 ) || editable.isInline() ) {
				return editable;
			} else {
				return editor.document;
			}
		},

		/**
		 * IE 8 & 9 split text node on drop so the first node contains the
		 * text before the drop position and the second contains the rest. If you
		 * drag the content from the same node you will be not be able to get
		 * it (the range becomes invalid), so you need to join them back.
		 *
		 * Note that the first node in IE 8 & 9 is the original node object
		 * but with shortened content.
		 *
		 *		Before:
		 *		  --- Text Node A ----------------------------------
		 *		                                             /\
		 *		                                        Drag position
		 *
		 *		After (IE 8 & 9):
		 *		  --- Text Node A -----  --- Text Node B -----------
		 *		                       /\                    /\
		 *		                  Drop position        Drag position
		 *		                                         (invalid)
		 *
		 *		After (other browsers):
		 *		  --- Text Node A ----------------------------------
		 *		                       /\                    /\
		 *		                  Drop position        Drag position
		 *
		 * **Note:** This function is in the public scope for tests usage only.
		 *
		 * @since 4.5.0
		 * @private
		 * @param {CKEDITOR.dom.range} dragRange The drag range.
		 * @param {CKEDITOR.dom.range} dropRange The drop range.
		 * @param {Number} preDragStartContainerChildCount The number of children of the drag range start container before the drop.
		 * @param {Number} preDragEndContainerChildCount The number of children of the drag range end container before the drop.
		 */
		fixSplitNodesAfterDrop: function( dragRange, dropRange, preDragStartContainerChildCount, preDragEndContainerChildCount ) {
			var dropContainer = dropRange.startContainer;

			if (
				typeof preDragEndContainerChildCount != 'number' ||
				typeof preDragStartContainerChildCount != 'number'
			) {
				return;
			}

			// We are only concerned about ranges anchored in elements.
			if ( dropContainer.type != CKEDITOR.NODE_ELEMENT ) {
				return;
			}

			if ( handleContainer( dragRange.startContainer, dropContainer, preDragStartContainerChildCount ) ) {
				return;
			}

			if ( handleContainer( dragRange.endContainer, dropContainer, preDragEndContainerChildCount ) ) {
				return;
			}

			function handleContainer( dragContainer, dropContainer, preChildCount ) {
				var dragElement = dragContainer;
				if ( dragElement.type == CKEDITOR.NODE_TEXT ) {
					dragElement = dragContainer.getParent();
				}

				if ( dragElement.equals( dropContainer ) && preChildCount != dropContainer.getChildCount() ) {
					applyFix( dropRange );
					return true;
				}
			}

			function applyFix( dropRange ) {
				var nodeBefore = dropRange.startContainer.getChild( dropRange.startOffset - 1 ),
					nodeAfter = dropRange.startContainer.getChild( dropRange.startOffset );

				if (
					nodeBefore && nodeBefore.type == CKEDITOR.NODE_TEXT &&
					nodeAfter && nodeAfter.type == CKEDITOR.NODE_TEXT
				) {
					var offset = nodeBefore.getLength();

					nodeBefore.setText( nodeBefore.getText() + nodeAfter.getText() );
					nodeAfter.remove();

					dropRange.setStart( nodeBefore, offset );
					dropRange.collapse( true );
				}
			}
		},

		/**
		 * Checks whether turning the drag range into bookmarks will invalidate the drop range.
		 * This usually happens when the drop range shares the container with the drag range and is
		 * located after the drag range, but there are countless edge cases.
		 *
		 * This function is stricly related to {@link #internalDrop} which toggles
		 * order in which it creates bookmarks for both ranges based on a value returned
		 * by this method. In some cases this method returns a value which is not necessarily
		 * true in terms of what it was meant to check, but it is convenient, because
		 * we know how it is interpreted in {@link #internalDrop}, so the correct
		 * behavior of the entire algorithm is assured.
		 *
		 * **Note:** This function is in the public scope for tests usage only.
		 *
		 * @since 4.5.0
		 * @private
		 * @param {CKEDITOR.dom.range} dragRange The first range to compare.
		 * @param {CKEDITOR.dom.range} dropRange The second range to compare.
		 * @returns {Boolean} `true` if the first range is before the second range.
		 */
		isDropRangeAffectedByDragRange: function( dragRange, dropRange ) {
			var dropContainer = dropRange.startContainer,
				dropOffset = dropRange.endOffset;

			// Both containers are the same and drop offset is at the same position or later.
			// " A L] A " " M A "
			//       ^ ^
			if ( dragRange.endContainer.equals( dropContainer ) && dragRange.endOffset <= dropOffset ) {
				return true;
			}

			// Bookmark for drag start container will mess up with offsets.
			// " O [L A " " M A "
			//           ^       ^
			if (
				dragRange.startContainer.getParent().equals( dropContainer ) &&
				dragRange.startContainer.getIndex() < dropOffset
			) {
				return true;
			}

			// Bookmark for drag end container will mess up with offsets.
			// " O] L A " " M A "
			//           ^       ^
			if (
				dragRange.endContainer.getParent().equals( dropContainer ) &&
				dragRange.endContainer.getIndex() < dropOffset
			) {
				return true;
			}

			return false;
		},

		/**
		 * Internal drag and drop (drag and drop in the same editor instance).
		 *
		 * **Note:** This function is in the public scope for tests usage only.
		 *
		 * @since 4.5.0
		 * @private
		 * @param {CKEDITOR.dom.range} dragRange The first range to compare.
		 * @param {CKEDITOR.dom.range} dropRange The second range to compare.
		 * @param {CKEDITOR.plugins.clipboard.dataTransfer} dataTransfer
		 * @param {CKEDITOR.editor} editor
		 */
		internalDrop: function( dragRange, dropRange, dataTransfer, editor ) {
			var clipboard = CKEDITOR.plugins.clipboard,
				editable = editor.editable(),
				dragBookmark, dropBookmark, isDropRangeAffected;

			// Save and lock snapshot so there will be only
			// one snapshot for both remove and insert content.
			editor.fire( 'saveSnapshot' );
			editor.fire( 'lockSnapshot', { dontUpdate: 1 } );

			if ( CKEDITOR.env.ie && CKEDITOR.env.version < 10 ) {
				this.fixSplitNodesAfterDrop(
					dragRange,
					dropRange,
					clipboard.dragStartContainerChildCount,
					clipboard.dragEndContainerChildCount
				);
			}

			// Because we manipulate multiple ranges we need to do it carefully,
			// changing one range (event creating a bookmark) may make other invalid.
			// We need to change ranges into bookmarks so we can manipulate them easily in the future.
			// We can change the range which is later in the text before we change the preceding range.
			// We call isDropRangeAffectedByDragRange to test the order of ranges.
			isDropRangeAffected = this.isDropRangeAffectedByDragRange( dragRange, dropRange );
			if ( !isDropRangeAffected ) {
				dragBookmark = dragRange.createBookmark( false );
			}
			dropBookmark = dropRange.clone().createBookmark( false );
			if ( isDropRangeAffected ) {
				dragBookmark = dragRange.createBookmark( false );
			}

			// Check if drop range is inside range.
			// This is an edge case when we drop something on editable's margin/padding.
			// That space is not treated as a part of the range we drag, so it is possible to drop there.
			// When we drop, browser tries to find closest drop position and it finds it inside drag range. (https://dev.ckeditor.com/ticket/13453)
			var startNode = dragBookmark.startNode,
				endNode = dragBookmark.endNode,
				dropNode = dropBookmark.startNode,
				dropInsideDragRange =
					// Must check endNode because dragRange could be collapsed in some edge cases (simulated DnD).
					endNode &&
					( startNode.getPosition( dropNode ) & CKEDITOR.POSITION_PRECEDING ) &&
					( endNode.getPosition( dropNode ) & CKEDITOR.POSITION_FOLLOWING );

			// If the drop range happens to be inside drag range change it's position to the beginning of the drag range.
			if ( dropInsideDragRange ) {
				// We only change position of bookmark span that is connected with dropBookmark.
				// dropRange will be overwritten and set to the dropBookmark later.
				dropNode.insertBefore( startNode );
			}

			// No we can safely delete content for the drag range...
			dragRange = editor.createRange();
			dragRange.moveToBookmark( dragBookmark );
			editable.extractHtmlFromRange( dragRange, 1 );

			// ...and paste content into the drop position.
			dropRange = editor.createRange();
			// Get actual selection with bookmarks if drop's bookmark are not in editable any longer.
			// This might happen after extracting content from range (#2292).
			if ( !dropBookmark.startNode.getCommonAncestor( editable ) ) {
				dropBookmark = editor.getSelection().createBookmarks()[ 0 ];
			}
			dropRange.moveToBookmark( dropBookmark );

			// We do not select drop range, because of may be in the place we can not set the selection
			// (e.g. between blocks, in case of block widget D&D). We put range to the paste event instead.
			firePasteEvents( editor, { dataTransfer: dataTransfer, method: 'drop', range: dropRange }, 1 );

			editor.fire( 'unlockSnapshot' );
		},

		/**
		 * Gets the range from the `drop` event.
		 *
		 * @since 4.5.0
		 * @param {Object} domEvent A native DOM drop event object.
		 * @param {CKEDITOR.editor} editor The source editor instance.
		 * @returns {CKEDITOR.dom.range} range at drop position.
		 */
		getRangeAtDropPosition: function( dropEvt, editor ) {
			var $evt = dropEvt.data.$,
				x = $evt.clientX,
				y = $evt.clientY,
				$range,
				defaultRange = editor.getSelection( true ).getRanges()[ 0 ],
				range = editor.createRange();

			// Make testing possible.
			if ( dropEvt.data.testRange )
				return dropEvt.data.testRange;

			// Webkits.
			if ( document.caretRangeFromPoint && editor.document.$.caretRangeFromPoint( x, y ) ) {
				$range = editor.document.$.caretRangeFromPoint( x, y );
				range.setStart( CKEDITOR.dom.node( $range.startContainer ), $range.startOffset );
				range.collapse( true );
			}
			// FF.
			else if ( $evt.rangeParent ) {
				range.setStart( CKEDITOR.dom.node( $evt.rangeParent ), $evt.rangeOffset );
				range.collapse( true );
			}
			// IEs 9+.
			// We check if editable is focused to make sure that it's an internal DnD. External DnD must use the second
			// mechanism because of https://dev.ckeditor.com/ticket/13472#comment:6.
			else if ( CKEDITOR.env.ie && CKEDITOR.env.version > 8 && defaultRange && editor.editable().hasFocus ) {
				// On IE 9+ range by default is where we expected it.
				// defaultRange may be undefined if dragover was canceled (file drop).
				return defaultRange;
			}
			// IE 8 and all IEs if !defaultRange or external DnD.
			else if ( document.body.createTextRange ) {
				// To use this method we need a focus (which may be somewhere else in case of external drop).
				editor.focus();

				$range = editor.document.getBody().$.createTextRange();
				try {
					var sucess = false;

					// If user drop between text line IEs moveToPoint throws exception:
					//
					//		Lorem ipsum pulvinar purus et euismod
					//
					//		dolor sit amet,| consectetur adipiscing
					//		               *
					//		vestibulum tincidunt augue eget tempus.
					//
					// * - drop position
					// | - expected cursor position
					//
					// So we try to call moveToPoint with +-1px up to +-20px above or
					// below original drop position to find nearest good drop position.
					for ( var i = 0; i < 20 && !sucess; i++ ) {
						if ( !sucess ) {
							try {
								$range.moveToPoint( x, y - i );
								sucess = true;
							} catch ( err ) {
							}
						}
						if ( !sucess ) {
							try {
								$range.moveToPoint( x, y + i );
								sucess = true;
							} catch ( err ) {
							}
						}
					}

					if ( sucess ) {
						var id = 'cke-temp-' + ( new Date() ).getTime();
						$range.pasteHTML( '<span id="' + id + '">\u200b</span>' );

						var span = editor.document.getById( id );
						range.moveToPosition( span, CKEDITOR.POSITION_BEFORE_START );
						span.remove();
					} else {
						// If the fist method does not succeed we might be next to
						// the short element (like header):
						//
						//		Lorem ipsum pulvinar purus et euismod.
						//
						//
						//		SOME HEADER|        *
						//
						//
						//		vestibulum tincidunt augue eget tempus.
						//
						// * - drop position
						// | - expected cursor position
						//
						// In such situation elementFromPoint returns proper element. Using getClientRect
						// it is possible to check if the cursor should be at the beginning or at the end
						// of paragraph.
						var $element = editor.document.$.elementFromPoint( x, y ),
							element = new CKEDITOR.dom.element( $element ),
							rect;

						if ( !element.equals( editor.editable() ) && element.getName() != 'html' ) {
							rect = element.getClientRect();

							if ( x < rect.left ) {
								range.setStartAt( element, CKEDITOR.POSITION_AFTER_START );
								range.collapse( true );
							} else {
								range.setStartAt( element, CKEDITOR.POSITION_BEFORE_END );
								range.collapse( true );
							}
						}
						// If drop happens on no element elementFromPoint returns html or body.
						//
						//		*      |Lorem ipsum pulvinar purus et euismod.
						//
						//		       vestibulum tincidunt augue eget tempus.
						//
						// * - drop position
						// | - expected cursor position
						//
						// In such case we can try to use default selection. If startContainer is not
						// 'editable' element it is probably proper selection.
						else if ( defaultRange && defaultRange.startContainer &&
							!defaultRange.startContainer.equals( editor.editable() ) ) {
							return defaultRange;

						// Otherwise we can not find any drop position and we have to return null
						// and cancel drop event.
						} else {
							return null;
						}

					}
				} catch ( err ) {
					return null;
				}
			} else {
				return null;
			}

			return range;
		},

		/**
		 * This function tries to link the `evt.data.dataTransfer` property of the {@link CKEDITOR.editor#dragstart},
		 * {@link CKEDITOR.editor#dragend} and {@link CKEDITOR.editor#drop} events to a single
		 * {@link CKEDITOR.plugins.clipboard.dataTransfer} object.
		 *
		 * This method is automatically used by the core of the drag and drop functionality and
		 * usually does not have to be called manually when using the drag and drop events.
		 *
		 * This method behaves differently depending on whether the drag and drop events were fired
		 * artificially (to represent a non-native drag and drop) or whether they were caused by the native drag and drop.
		 *
		 * If the native event is not available, then it will create a new {@link CKEDITOR.plugins.clipboard.dataTransfer}
		 * instance (if it does not exist already) and will link it to this and all following event objects until
		 * the {@link #resetDragDataTransfer} method is called. It means that all three drag and drop events must be fired
		 * in order to ensure that the data transfer is bound correctly.
		 *
		 * If the native event is available, then the {@link CKEDITOR.plugins.clipboard.dataTransfer} is identified
		 * by its ID and a new instance is assigned to the `evt.data.dataTransfer` only if the ID changed or
		 * the {@link #resetDragDataTransfer} method was called.
		 *
		 * @since 4.5.0
		 * @param {CKEDITOR.dom.event} [evt] A drop event object.
		 * @param {CKEDITOR.editor} [sourceEditor] The source editor instance.
		 */
		initDragDataTransfer: function( evt, sourceEditor ) {
			// Create a new dataTransfer object based on the drop event.
			// If this event was used on dragstart to create dataTransfer
			// both dataTransfer objects will have the same id.
			var nativeDataTransfer = evt.data.$ ? evt.data.$.dataTransfer : null,
				dataTransfer = new this.dataTransfer( nativeDataTransfer, sourceEditor );

			// Set dataTransfer.id only for 'dragstart' event (so for events initializing dataTransfer inside editor) (#962).
			if ( evt.name === 'dragstart' ) {
				dataTransfer.storeId();
			}

			if ( !nativeDataTransfer ) {
				// No native event.
				if ( this.dragData ) {
					dataTransfer = this.dragData;
				} else {
					this.dragData = dataTransfer;
				}
			} else {
				// Native event. If there is the same id we will replace dataTransfer with the one
				// created on drag, because it contains drag editor, drag content and so on.
				// Otherwise (in case of drag from external source) we save new object to
				// the global clipboard.dragData.
				if ( this.dragData && dataTransfer.id == this.dragData.id ) {
					dataTransfer = this.dragData;
				} else {
					this.dragData = dataTransfer;
				}
			}

			evt.data.dataTransfer = dataTransfer;
		},

		/**
		 * Removes the global {@link #dragData} so the next call to {@link #initDragDataTransfer}
		 * always creates a new instance of {@link CKEDITOR.plugins.clipboard.dataTransfer}.
		 *
		 * @since 4.5.0
		 */
		resetDragDataTransfer: function() {
			this.dragData = null;
		},

		/**
		 * Global object storing the data transfer of the current drag and drop operation.
		 * Do not use it directly, use {@link #initDragDataTransfer} and {@link #resetDragDataTransfer}.
		 *
		 * Note: This object is global (meaning that it is not related to a single editor instance)
		 * in order to handle drag and drop from one editor into another.
		 *
		 * @since 4.5.0
		 * @private
		 * @property {CKEDITOR.plugins.clipboard.dataTransfer} dragData
		 */

		/**
		 * Range object to save the drag range and remove its content after the drop.
		 *
		 * @since 4.5.0
		 * @private
		 * @property {CKEDITOR.dom.range} dragRange
		 */

		/**
		 * Initializes and links data transfer objects based on the paste event. If the data
		 * transfer object was already initialized on this event, the function will
		 * return that object. In IE it is not possible to link copy/cut and paste events
		 * so the method always returns a new object. The same happens if there is no paste event
		 * passed to the method.
		 *
		 * @since 4.5.0
		 * @param {CKEDITOR.dom.event} [evt] A paste event object.
		 * @param {CKEDITOR.editor} [sourceEditor] The source editor instance.
		 * @returns {CKEDITOR.plugins.clipboard.dataTransfer} The data transfer object.
		 */
		initPasteDataTransfer: function( evt, sourceEditor ) {
			if ( !this.isCustomCopyCutSupported ) {
				// Edge < 16 does not support custom copy/cut, but it has some useful data in the clipboardData (https://dev.ckeditor.com/ticket/13755).
				return new this.dataTransfer( ( CKEDITOR.env.edge && evt && evt.data.$ && evt.data.$.clipboardData ) || null, sourceEditor );
			} else if ( evt && evt.data && evt.data.$ ) {
				var clipboardData = evt.data.$.clipboardData,
					dataTransfer = new this.dataTransfer( clipboardData, sourceEditor );

				// Set dataTransfer.id only for 'copy'/'cut' events (so for events initializing dataTransfer inside editor) (#962).
				if ( evt.name === 'copy' || evt.name === 'cut' ) {
					dataTransfer.storeId();
				}

				if ( this.copyCutData && dataTransfer.id == this.copyCutData.id ) {
					dataTransfer = this.copyCutData;
					dataTransfer.$ = clipboardData;
				} else {
					this.copyCutData = dataTransfer;
				}

				return dataTransfer;
			} else {
				return new this.dataTransfer( null, sourceEditor );
			}
		},

		/**
		 * Prevents dropping on the specified element.
		 *
		 * @since 4.5.0
		 * @param {CKEDITOR.dom.element} element The element on which dropping should be disabled.
		 */
		preventDefaultDropOnElement: function( element ) {
			element && element.on( 'dragover', preventDefaultSetDropEffectToNone );
		}
	};

	// Data type used to link drag and drop events.
	//
	// In IE URL data type is buggie and there is no way to mark drag & drop  without
	// modifying text data (which would be displayed if user drop content to the textarea)
	// so we just read dragged text.
	//
	// In Chrome and Firefox we can use custom data types.
	clipboardIdDataType = CKEDITOR.plugins.clipboard.isCustomDataTypesSupported ? 'cke/id' : 'Text';

	/**
	 * Facade for the native `dataTransfer`/`clipboadData` object to hide all differences
	 * between browsers.
	 *
	 * @since 4.5.0
	 * @class CKEDITOR.plugins.clipboard.dataTransfer
	 * @constructor Creates a class instance.
	 * @param {Object} [nativeDataTransfer] A native data transfer object.
	 * @param {CKEDITOR.editor} [editor] The source editor instance. If the editor is defined, dataValue will
	 * be created based on the editor content and the type will be 'html'.
	 */
	CKEDITOR.plugins.clipboard.dataTransfer = function( nativeDataTransfer, editor ) {
		if ( nativeDataTransfer ) {
			this.$ = nativeDataTransfer;
		}

		this._ = {
			metaRegExp: /^<meta.*?>/i,
			bodyRegExp: /<body(?:[\s\S]*?)>([\s\S]*)<\/body>/i,
			fragmentRegExp: /<!--(?:Start|End)Fragment-->/g,

			data: {},
			files: [],

			// Stores full HTML so it can be accessed asynchronously with `getData( 'text/html', true )`.
			nativeHtmlCache: '',

			normalizeType: function( type ) {
				type = type.toLowerCase();

				if ( type == 'text' || type == 'text/plain' ) {
					return 'Text'; // IE support only Text and URL;
				} else if ( type == 'url' ) {
					return 'URL'; // IE support only Text and URL;
				} else {
					return type;
				}
			}
		};
		this._.fallbackDataTransfer = new CKEDITOR.plugins.clipboard.fallbackDataTransfer( this );

		// Check if ID is already created.
		this.id = this.getData( clipboardIdDataType );

		// If there is no ID we need to create it. Different browsers needs different ID.
		if ( !this.id ) {
			if ( clipboardIdDataType == 'Text' ) {
				// For IE10+ only Text data type is supported and we have to compare dragged
				// and dropped text. If the ID is not set it means that empty string was dragged
				// (ex. image with no alt). We change null to empty string.
				this.id = '';
			} else {
				// String for custom data type.
				this.id = 'cke-' + CKEDITOR.tools.getUniqueId();
			}
		}

		if ( editor ) {
			this.sourceEditor = editor;

			this.setData( 'text/html', editor.getSelectedHtml( 1 ) );

			// Without setData( 'text', ... ) on dragstart there is no drop event in Safari.
			// Also 'text' data is empty as drop to the textarea does not work if we do not put there text.
			if ( clipboardIdDataType != 'Text' && !this.getData( 'text/plain' ) ) {
				this.setData( 'text/plain', editor.getSelection().getSelectedText() );
			}
		}

		/**
		 * Data transfer ID used to bind all dataTransfer
		 * objects based on the same event (e.g. in drag and drop events).
		 *
		 * @readonly
		 * @property {String} id
		 */

		/**
		 * A native DOM event object.
		 *
		 * @readonly
		 * @property {Object} $
		 */

		/**
		 * Source editor &mdash; the editor where the drag starts.
		 * Might be undefined if the drag starts outside the editor (e.g. when dropping files to the editor).
		 *
		 * @readonly
		 * @property {CKEDITOR.editor} sourceEditor
		 */

		/**
		 * Private properties and methods.
		 *
		 * @private
		 * @property {Object} _
		 */
	};

	/**
	 * Data transfer operation (drag and drop or copy and paste) started and ended in the same
	 * editor instance.
	 *
	 * @since 4.5.0
	 * @readonly
	 * @property {Number} [=1]
	 * @member CKEDITOR
	 */
	CKEDITOR.DATA_TRANSFER_INTERNAL = 1;

	/**
	 * Data transfer operation (drag and drop or copy and paste) started in one editor
	 * instance and ended in another.
	 *
	 * @since 4.5.0
	 * @readonly
	 * @property {Number} [=2]
	 * @member CKEDITOR
	 */
	CKEDITOR.DATA_TRANSFER_CROSS_EDITORS = 2;

	/**
	 * Data transfer operation (drag and drop or copy and paste) started outside of the editor.
	 * The source of the data may be a textarea, HTML, another application, etc.
	 *
	 * @since 4.5.0
	 * @readonly
	 * @property {Number} [=3]
	 * @member CKEDITOR
	 */
	CKEDITOR.DATA_TRANSFER_EXTERNAL = 3;

	CKEDITOR.plugins.clipboard.dataTransfer.prototype = {
		/**
		 * Facade for the native `getData` method.
		 *
		 * @param {String} type The type of data to retrieve.
		 * @param {Boolean} [getNative=false] Indicates if the whole, original content of the dataTransfer should be returned.
		 * Introduced in CKEditor 4.7.0.
		 * @returns {String} type Stored data for the given type or an empty string if the data for that type does not exist.
		 */
		getData: function( type, getNative ) {
			function isEmpty( data ) {
				return data === undefined || data === null || data === '';
			}

			function filterUnwantedCharacters( data ) {
				if ( typeof data !== 'string' ) {
					return data;
				}

				var htmlEnd = data.indexOf( '</html>' );

				if ( htmlEnd !== -1 ) {
					// Just cut everything after `</html>`, so everything after htmlEnd index + length of `</html>`.
					// Required to workaround bug: https://bugs.chromium.org/p/chromium/issues/detail?id=696978
					return data.substring( 0, htmlEnd + 7 );
				}

				return data;
			}

			type = this._.normalizeType( type );

			var data = type == 'text/html' && getNative ? this._.nativeHtmlCache : this._.data[ type ];

			if ( isEmpty( data ) ) {
				if ( this._.fallbackDataTransfer.isRequired() ) {
					data = this._.fallbackDataTransfer.getData( type, getNative );
				} else {
					try {
						data = this.$.getData( type ) || '';
					} catch ( e ) {
						data = '';
					}
				}

				if ( type == 'text/html' && !getNative ) {
					data = this._stripHtml( data );
				}
			}

			// Firefox on Linux put files paths as a text/plain data if there are files
			// in the dataTransfer object. We need to hide it, because files should be
			// handled on paste only if dataValue is empty.
			if ( type == 'Text' && CKEDITOR.env.gecko && this.getFilesCount() &&
				data.substring( 0, 7 ) == 'file://' ) {
				data = '';
			}

			return filterUnwantedCharacters( data );
		},

		/**
		 * Facade for the native `setData` method.
		 *
		 * @param {String} type The type of data to retrieve.
		 * @param {String} value The data to add.
		 */
		setData: function( type, value ) {
			type = this._.normalizeType( type );

			if ( type == 'text/html' ) {
				this._.data[ type ] = this._stripHtml( value );
				// If 'text/html' is set manually we also store it in `nativeHtmlCache` without modifications.
				this._.nativeHtmlCache = value;
			} else {
				this._.data[ type ] = value;
			}

			// There is "Unexpected call to method or property access." error if you try
			// to set data of unsupported type on IE.
			if ( !CKEDITOR.plugins.clipboard.isCustomDataTypesSupported && type != 'URL' && type != 'Text' ) {
				return;
			}

			// If we use the text type to bind the ID, then if someone tries to set the text, we must also
			// update ID accordingly. https://dev.ckeditor.com/ticket/13468.
			if ( clipboardIdDataType == 'Text' && type == 'Text' ) {
				this.id = value;
			}

			if ( this._.fallbackDataTransfer.isRequired() ) {
				this._.fallbackDataTransfer.setData( type, value );
			} else {
				try {
					this.$.setData( type, value );
				} catch ( e ) {}
			}
		},

		/**
		 * Stores dataTransfer id in native data transfer object
		 * so it can be retrieved by other events.
		 *
		 * @since 4.8.0
		 */
		storeId: function() {
			if ( clipboardIdDataType !== 'Text' ) {
				this.setData( clipboardIdDataType, this.id );
			}
		},

		/**
		 * Gets the data transfer type.
		 *
		 * @param {CKEDITOR.editor} targetEditor The drop/paste target editor instance.
		 * @returns {Number} Possible values: {@link CKEDITOR#DATA_TRANSFER_INTERNAL},
		 * {@link CKEDITOR#DATA_TRANSFER_CROSS_EDITORS}, {@link CKEDITOR#DATA_TRANSFER_EXTERNAL}.
		 */
		getTransferType: function( targetEditor ) {
			if ( !this.sourceEditor ) {
				return CKEDITOR.DATA_TRANSFER_EXTERNAL;
			} else if ( this.sourceEditor == targetEditor ) {
				return CKEDITOR.DATA_TRANSFER_INTERNAL;
			} else {
				return CKEDITOR.DATA_TRANSFER_CROSS_EDITORS;
			}
		},

		/**
		 * Copies the data from the native data transfer to a private cache.
		 * This function is needed because the data from the native data transfer
		 * is available only synchronously to the event listener. It is not possible
		 * to get the data asynchronously, after a timeout, and the {@link CKEDITOR.editor#paste}
		 * event is fired asynchronously &mdash; hence the need for caching the data.
		 */
		cacheData: function() {
			if ( !this.$ ) {
				return;
			}

			var that = this,
				i, file;

			function getAndSetData( type ) {
				type = that._.normalizeType( type );

				var data = that.getData( type );

				// Cache full html.
				if ( type == 'text/html' ) {
					that._.nativeHtmlCache = that.getData( type, true );
					data = that._stripHtml( data );
				}

				if ( data ) {
					that._.data[ type ] = data;
				}
			}

			// Copy data.
			if ( CKEDITOR.plugins.clipboard.isCustomDataTypesSupported ) {
				if ( this.$.types ) {
					for ( i = 0; i < this.$.types.length; i++ ) {
						getAndSetData( this.$.types[ i ] );
					}
				}
			} else {
				getAndSetData( 'Text' );
				getAndSetData( 'URL' );
			}

			// Copy files references.
			file = this._getImageFromClipboard();
			if ( ( this.$ && this.$.files ) || file ) {
				this._.files = [];

				// Edge have empty files property with no length (https://dev.ckeditor.com/ticket/13755).
				if ( this.$.files && this.$.files.length ) {
					for ( i = 0; i < this.$.files.length; i++ ) {
						this._.files.push( this.$.files[ i ] );
					}
				}

				// Don't include $.items if both $.files and $.items contains files, because,
				// according to spec and browsers behavior, they contain the same files.
				if ( this._.files.length === 0 && file ) {
					this._.files.push( file );
				}
			}
		},

		/**
		 * Gets the number of files in the dataTransfer object.
		 *
		 * @returns {Number} The number of files.
		 */
		getFilesCount: function() {
			if ( this._.files.length ) {
				return this._.files.length;
			}

			if ( this.$ && this.$.files && this.$.files.length ) {
				return this.$.files.length;
			}

			return this._getImageFromClipboard() ? 1 : 0;
		},

		/**
		 * Gets the file at the index given.
		 *
		 * @param {Number} i Index.
		 * @returns {File} File instance.
		 */
		getFile: function( i ) {
			if ( this._.files.length ) {
				return this._.files[ i ];
			}

			if ( this.$ && this.$.files && this.$.files.length ) {
				return this.$.files[ i ];
			}

			// File or null if the file was not found.
			return i === 0 ? this._getImageFromClipboard() : undefined;
		},

		/**
		 * Checks if the data transfer contains any data.
		 *
		 * @returns {Boolean} `true` if the object contains no data.
		 */
		isEmpty: function() {
			var typesToCheck = {},
				type;

			// If dataTransfer contains files it is not empty.
			if ( this.getFilesCount() ) {
				return false;
			}

			CKEDITOR.tools.array.forEach( CKEDITOR.tools.object.keys( this._.data ), function( type ) {
				typesToCheck[ type ] = 1;
			} );

			// Add native types.
			if ( this.$ ) {
				if ( CKEDITOR.plugins.clipboard.isCustomDataTypesSupported ) {
					if ( this.$.types ) {
						for ( var i = 0; i < this.$.types.length; i++ ) {
							typesToCheck[ this.$.types[ i ] ] = 1;
						}
					}
				} else {
					typesToCheck.Text = 1;
					typesToCheck.URL = 1;
				}
			}

			// Remove ID.
			if ( clipboardIdDataType != 'Text' ) {
				typesToCheck[ clipboardIdDataType ] = 0;
			}

			for ( type in typesToCheck ) {
				if ( typesToCheck[ type ] && this.getData( type ) !== '' ) {
					return false;
				}
			}

			return true;
		},

		/**
		 * When the content of the clipboard is pasted in Chrome, the clipboard data object has an empty `files` property,
		 * but it is possible to get the file as `items[0].getAsFile();` (https://dev.ckeditor.com/ticket/12961).
		 *
		 * @private
		 * @returns {File} File instance or `null` if not found.
		 */
		_getImageFromClipboard: function() {
			var file;
			try {
				if ( this.$ && this.$.items && this.$.items[ 0 ] ) {
					file = this.$.items[ 0 ].getAsFile();
					// Duck typing
					if ( file && file.type ) {
						return file;
					}
				}
			} catch ( err ) {
			// noop
			}

			return undefined;
		},

		/**
		 * This function removes this meta information and returns only the contents of the `<body>` element if found.
		 *
		 * Various environments use miscellaneous meta tags in HTML clipboard, e.g.
		 *
		 * * `<meta http-equiv="content-type" content="text/html; charset=utf-8">` at the begging of the HTML data.
		 * * Surrounding HTML with `<!--StartFragment-->` and `<!--EndFragment-->` nested within `<html><body>` elements.
		 *
		 * @private
		 * @param {String} html
		 * @returns {String}
		 */
		_stripHtml: function( html ) {
			var result = html;

			// Passed HTML may be empty or null. There is no need to strip such values (#1299).
			if ( result && result.length ) {
				// See https://dev.ckeditor.com/ticket/13583 for more details.
				// Additionally https://dev.ckeditor.com/ticket/16847 adds a flag allowing to get the whole, original content.
				result = result.replace( this._.metaRegExp, '' );

				// Keep only contents of the <body> element
				var match = this._.bodyRegExp.exec( result );
				if ( match && match.length ) {
					result = match[ 1 ];

					// Remove also comments.
					result = result.replace( this._.fragmentRegExp, '' );
				}
			}

			return result;
		}
	};

	/**
	 * Fallback dataTransfer object which is used together with {@link CKEDITOR.plugins.clipboard.dataTransfer}
	 * for browsers supporting Clipboard API, but not supporting custom
	 * MIME types (Edge 16+, see [ckeditor-dev/issues/#962](https://github.com/ckeditor/ckeditor-dev/issues/962)).
	 *
	 * @since 4.8.0
	 * @class CKEDITOR.plugins.clipboard.fallbackDataTransfer
	 * @constructor
	 * @param {CKEDITOR.plugins.clipboard.dataTransfer} dataTransfer DataTransfer
	 * object which internal cache and
	 * {@link CKEDITOR.plugins.clipboard.dataTransfer#$ data transfer} objects will be reused.
	 */
	CKEDITOR.plugins.clipboard.fallbackDataTransfer = function( dataTransfer ) {
		/**
		 * DataTransfer object which internal cache and
		 * {@link CKEDITOR.plugins.clipboard.dataTransfer#$ data transfer} objects will be modified if needed.
		 *
		 * @private
		 * @property {CKEDITOR.plugins.clipboard.dataTransfer} _dataTransfer
		 */
		this._dataTransfer = dataTransfer;

		/**
		 * A MIME type used for storing custom MIME types.
		 *
		 * @private
		 * @property {String} [_customDataFallbackType='text/html']
		 */
		this._customDataFallbackType = 'text/html';
	};

	/**
	 * True if the environment supports custom MIME types in {@link CKEDITOR.plugins.clipboard.dataTransfer#getData}
	 * and {@link CKEDITOR.plugins.clipboard.dataTransfer#setData} methods.
	 *
	 * Introduced to distinguish between browsers which support only some whitelisted types (like `text/html`, `application/xml`),
	 * but do not support custom MIME types (like `cke/id`). When the value of this property equals `null`
	 * it means it was not yet initialized.
	 *
	 * This property should not be accessed directly, use {@link #isRequired} method instead.
	 *
	 * @private
	 * @static
	 * @property {Boolean}
	 */
	CKEDITOR.plugins.clipboard.fallbackDataTransfer._isCustomMimeTypeSupported = null;

	/**
	 * Array containing MIME types which are not supported by native `setData`. Those types are
	 * recognized by error which is thrown when using native `setData` with a given type
	 * (see {@link CKEDITOR.plugins.clipboard.fallbackDataTransfer#_isUnsupportedMimeTypeError}).
	 *
	 * @private
	 * @static
	 * @property {String[]}
	 */
	CKEDITOR.plugins.clipboard.fallbackDataTransfer._customTypes = [];

	CKEDITOR.plugins.clipboard.fallbackDataTransfer.prototype = {
		/**
		 * Whether {@link CKEDITOR.plugins.clipboard.fallbackDataTransfer fallbackDataTransfer object} should
		 * be used when operating on native `dataTransfer`. If `true` is returned, it means custom MIME types
		 * are not supported in the current browser (see {@link #_isCustomMimeTypeSupported}).
		 *
		 * @returns {Boolean}
		 */
		isRequired: function() {
			var fallbackDataTransfer = CKEDITOR.plugins.clipboard.fallbackDataTransfer,
				nativeDataTransfer = this._dataTransfer.$;

			if ( fallbackDataTransfer._isCustomMimeTypeSupported === null ) {
				// If there is no `dataTransfer` we cannot detect if fallback is needed.
				// Method returns `false` so regular flow will be applied.
				if ( !nativeDataTransfer ) {
					return false;
				} else {
					var testValue = 'cke test value',
						testType = 'cke/mimetypetest';

					fallbackDataTransfer._isCustomMimeTypeSupported = false;

					// It looks like after our custom MIME type test Edge 17 is denying access on nativeDataTransfer (#2169).
					// Upstream issue: https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/18089287/
					if ( CKEDITOR.env.edge && CKEDITOR.env.version >= 17 ) {
						return true;
					}

					try {
						nativeDataTransfer.setData( testType, testValue );
						fallbackDataTransfer._isCustomMimeTypeSupported = nativeDataTransfer.getData( testType ) === testValue;
						nativeDataTransfer.clearData( testType );
					} catch ( e ) {}
				}
			}
			return !fallbackDataTransfer._isCustomMimeTypeSupported;
		},

		/**
		 * Returns the data of the given MIME type if stored in a regular way or in a special comment. If given type
		 * is the same as {@link #_customDataFallbackType} the whole data without special comment is returned.
		 *
		 * @param {String} type
		 * @param {Boolean} [getNative=false] Indicates if the whole, original content of the dataTransfer should be returned.
		 * @returns {String}
		 */
		getData: function( type, getNative ) {
			// As cache is already checked in CKEDITOR.plugins.clipboard.dataTransfer#getData it is skipped
			// here. So the assumption is the given type is not in cache.

			var nativeData = this._getData( this._customDataFallbackType, true );
			if ( getNative ) {
				return nativeData;
			}

			var dataComment = this._extractDataComment( nativeData ),
				value = null;

			// If we are getting the same type which may store custom data we need to extract content only.
			if ( type === this._customDataFallbackType ) {
				value = dataComment.content;
			} else {
				// If we are getting different type we need to check inside data comment if it is stored there.
				if ( dataComment.data && dataComment.data[ type ] ) {
					value = dataComment.data[ type ];
				} else {
					// And then fallback to regular `getData`.
					value = this._getData( type, true );
				}
			}

			return value !== null ? value : '';
		},

		/**
		 * Sets given data in native `dataTransfer` object. If given MIME type is not supported it uses
		 * {@link #_customDataFallbackType} MIME type to save data using special comment format:
		 *
		 * 		<!--cke-data:{ type: value }-->
		 *
		 * It is important to keep in mind that `{ type: value }` object is stringified (using `JSON.stringify`)
		 * and encoded (using `encodeURIComponent`).
		 *
		 * @param {String} type
		 * @param {String} value
		 * @returns {String} The value which was set.
		 */
		setData: function( type, value ) {
			// In case of fallbackDataTransfer, cache does not reflect native data one-to-one. For example, having
			// types like text/plain, text/html, cke/id will result in cache storing:
			//
			//		{
			// 			text/plain: value1,
			//			text/html: value2,
			//			cke/id: value3
			//		}
			//
			// and native dataTransfer storing:
			//
			//		{
			//			text/plain: value1,
			//			text/html: <!--cke-data:{ cke/id: value3 }-->value2
			//		}
			//
			// This way, accessing cache will always return proper value for a given type without a need for further processing.
			// Cache is already set in CKEDITOR.plugins.clipboard.dataTransfer#setData so it is skipped here.
			var isFallbackDataType = type === this._customDataFallbackType;

			if ( isFallbackDataType ) {
				value = this._applyDataComment( value, this._getFallbackTypeData() );
			}

			var data = value,
				nativeDataTransfer = this._dataTransfer.$;

			try {
				nativeDataTransfer.setData( type, data );

				if ( isFallbackDataType ) {
					// If fallback type used, the native data is different so we overwrite `nativeHtmlCache` here.
					this._dataTransfer._.nativeHtmlCache = data;
				}
			} catch ( e ) {
				if ( this._isUnsupportedMimeTypeError( e ) ) {
					var fallbackDataTransfer = CKEDITOR.plugins.clipboard.fallbackDataTransfer;

					if ( CKEDITOR.tools.indexOf( fallbackDataTransfer._customTypes, type ) === -1 ) {
						fallbackDataTransfer._customTypes.push( type );
					}

					var fallbackTypeContent = this._getFallbackTypeContent(),
						fallbackTypeData = this._getFallbackTypeData();

					fallbackTypeData[ type ] = data;

					try {
						data = this._applyDataComment( fallbackTypeContent, fallbackTypeData );
						nativeDataTransfer.setData( this._customDataFallbackType, data );
						// Again, fallback type was changed, so we need to refresh the cache.
						this._dataTransfer._.nativeHtmlCache = data;
					} catch ( e ) {
						data = '';
						// Some dev logger should be added here.
					}
				}
			}

			return data;
		},

		/**
		 * Native getData wrapper.
		 *
		 * @private
		 * @param {String} type
		 * @param {Boolean} [skipCache=false]
		 * @returns {String|null}
		 */
		_getData: function( type, skipCache ) {
			var cache = this._dataTransfer._.data;

			if ( !skipCache && cache[ type ] ) {
				return cache[ type ];
			} else {
				try {
					return this._dataTransfer.$.getData( type );
				} catch ( e ) {
					return null;
				}
			}
		},

		/**
		 * Returns content stored in {@link #\_customDataFallbackType}. Content is always first retrieved
		 * from {@link #_dataTransfer} cache and then from native `dataTransfer` object.
		 *
		 * @private
		 * @returns {String}
		 */
		_getFallbackTypeContent: function() {
			var fallbackTypeContent = this._dataTransfer._.data[ this._customDataFallbackType ];

			if ( !fallbackTypeContent ) {
				fallbackTypeContent = this._extractDataComment( this._getData( this._customDataFallbackType, true ) ).content;
			}
			return fallbackTypeContent;
		},

		/**
		 * Returns custom data stored in {@link #\_customDataFallbackType}. Custom data is always first retrieved
		 * from {@link #_dataTransfer} cache and then from native `dataTransfer` object.
		 *
		 * @private
		 * @returns {Object}
		 */
		_getFallbackTypeData: function() {
			var fallbackTypes = CKEDITOR.plugins.clipboard.fallbackDataTransfer._customTypes,
				fallbackTypeData = this._extractDataComment( this._getData( this._customDataFallbackType, true ) ).data || {},
				cache = this._dataTransfer._.data;

			CKEDITOR.tools.array.forEach( fallbackTypes, function( type ) {
				if ( cache[ type ] !== undefined ) {
					fallbackTypeData[ type ] = cache[ type ];

				} else if ( fallbackTypeData[ type ] !== undefined ) {
					fallbackTypeData[ type ] = fallbackTypeData[ type ];
				}
			}, this );

			return fallbackTypeData;
		},

		/**
		 * Whether provided error means that unsupported MIME type was used when calling native `dataTransfer.setData` method.
		 *
		 * @private
		 * @param {Error} error
		 * @returns {Boolean}
		 */
		_isUnsupportedMimeTypeError: function( error ) {
			return error.message && error.message.search( /element not found/gi ) !== -1;
		},

		/**
		 * Extracts `cke-data` comment from the given content.
		 *
		 * @private
		 * @param {String} content
		 * @returns {Object} Returns an object containing extracted data as `data`
		 * and content (without `cke-data` comment) as `content`.
		 * @returns {Object|null} return.data Object containing `MIME type : value` pairs
		 * or null if `cke-data` comment is not present.
		 * @returns {String} return.content Regular content without `cke-data` comment.
		 */
		_extractDataComment: function( content ) {
			var result = {
				data: null,
				content: content || ''
			};

			// At least 17 characters length: <!--cke-data:-->.
			if ( content && content.length > 16 ) {
				var matcher = /<!--cke-data:(.*?)-->/g,
					matches;

				matches = matcher.exec( content );
				if ( matches && matches[ 1 ] ) {
					result.data = JSON.parse( decodeURIComponent( matches[ 1 ] ) );
					result.content = content.replace( matches[ 0 ], '' );
				}
			}
			return result;
		},

		/**
		 * Creates `cke-data` comment containing stringified and encoded data object which is prepended to a given content.
		 *
		 * @private
		 * @param {String} content
		 * @param {Object} data
		 * @returns {String}
		 */
		_applyDataComment: function( content, data ) {
			var customData = '';
			if ( data && CKEDITOR.tools.object.keys( data ).length ) {
				customData = '<!--cke-data:' + encodeURIComponent( JSON.stringify( data ) ) + '-->';
			}
			return customData + ( content && content.length ? content : '' );
		}
	};

} )();

/**
 * The default content type that is used when pasted data cannot be clearly recognized as HTML or text.
 *
 * For example: `'foo'` may come from a plain text editor or a website. It is not possible to recognize the content
 * type in this case, so the default type will be used. At the same time it is clear that `'<b>example</b> text'` is
 * HTML and its origin is a web page, email or another rich text editor.
 *
 * **Note:** If content type is text, then styles of the paste context are preserved.
 *
 *		CKEDITOR.config.clipboard_defaultContentType = 'text';
 *
 * See also the {@link CKEDITOR.editor#paste} event and read more about the integration with clipboard
 * in the {@glink guide/dev_clipboard Clipboard Deep Dive guide}.
 *
 * @since 4.0.0
 * @cfg {'html'/'text'} [clipboard_defaultContentType='html']
 * @member CKEDITOR.config
 */

/**
 * Fired after the user initiated a paste action, but before the data is inserted into the editor.
 * The listeners to this event are able to process the content before its insertion into the document.
 *
 * Read more about the integration with clipboard in the {@glink guide/dev_clipboard Clipboard Deep Dive guide}.
 *
 * See also:
 *
 * * the {@link CKEDITOR.config#pasteFilter} option,
 * * the {@link CKEDITOR.editor#drop} event,
 * * the {@link CKEDITOR.plugins.clipboard.dataTransfer} class.
 *
 * @since 3.1.0
 * @event paste
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param data
 * @param {String} data.type The type of data in `data.dataValue`. Usually `'html'` or `'text'`, but for listeners
 * with a priority smaller than `6` it may also be `'auto'` which means that the content type has not been recognised yet
 * (this will be done by the content type sniffer that listens with priority `6`).
 * @param {String} data.dataValue HTML to be pasted.
 * @param {String} data.method Indicates the data transfer method. It could be drag and drop or copy and paste.
 * Possible values: `'drop'`, `'paste'`. Introduced in CKEditor 4.5.
 * @param {CKEDITOR.plugins.clipboard.dataTransfer} data.dataTransfer Facade for the native dataTransfer object
 * which provides access to various data types and files, and passes some data between linked events
 * (like drag and drop). Introduced in CKEditor 4.5.
 * @param {Boolean} [data.dontFilter=false] Whether the {@link CKEDITOR.editor#pasteFilter paste filter} should not
 * be applied to data. This option has no effect when `data.type` equals `'text'` which means that for instance
 * {@link CKEDITOR.config#forcePasteAsPlainText} has a higher priority. Introduced in CKEditor 4.5.
 */

/**
 * Fired before the {@link #paste} event. Allows to preset data type.
 *
 * **Note:** This event is deprecated. Add a `0` priority listener for the
 * {@link #paste} event instead.
 *
 * @deprecated
 * @event beforePaste
 * @member CKEDITOR.editor
 */

/**
 * Fired after the {@link #paste} event if content was modified. Note that if the paste
 * event does not insert any data, the `afterPaste` event will not be fired.
 *
 * @event afterPaste
 * @member CKEDITOR.editor
 */

/**
 * Internal event to open the Paste dialog window.
 *
 *
 * This event was not available in 4.7.0-4.8.0 versions.
 *
 * @private
 * @event pasteDialog
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param {Function} [data] Callback that will be passed to {@link CKEDITOR.editor#openDialog}.
 */

/**
 * Facade for the native `drop` event. Fired when the native `drop` event occurs.
 *
 * **Note:** To manipulate dropped data, use the {@link CKEDITOR.editor#paste} event.
 * Use the `drop` event only to control drag and drop operations (e.g. to prevent the ability to drop some content).
 *
 * Read more about integration with drag and drop in the {@glink guide/dev_clipboard Clipboard Deep Dive guide}.
 *
 * See also:
 *
 * * The {@link CKEDITOR.editor#paste} event,
 * * The {@link CKEDITOR.editor#dragstart} and {@link CKEDITOR.editor#dragend} events,
 * * The {@link CKEDITOR.plugins.clipboard.dataTransfer} class.
 *
 * @since 4.5.0
 * @event drop
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param data
 * @param {Object} data.$ Native drop event.
 * @param {CKEDITOR.dom.node} data.target Drop target.
 * @param {CKEDITOR.plugins.clipboard.dataTransfer} data.dataTransfer DataTransfer facade.
 * @param {CKEDITOR.dom.range} data.dragRange Drag range, lets you manipulate the drag range.
 * Note that dragged HTML is saved as `text/html` data on `dragstart` so if you change the drag range
 * on drop, dropped HTML will not change. You need to change it manually using
 * {@link CKEDITOR.plugins.clipboard.dataTransfer#setData dataTransfer.setData}.
 * @param {CKEDITOR.dom.range} data.dropRange Drop range, lets you manipulate the drop range.
 */

/**
 * Facade for the native `dragstart` event. Fired when the native `dragstart` event occurs.
 *
 * This event can be canceled in order to block the drag start operation. It can also be fired to mimic the start of the drag and drop
 * operation. For instance, the `widget` plugin uses this option to integrate its custom block widget drag and drop with
 * the entire system.
 *
 * Read more about integration with drag and drop in the {@glink guide/dev_clipboard Clipboard Deep Dive guide}.
 *
 * See also:
 *
 * * The {@link CKEDITOR.editor#paste} event,
 * * The {@link CKEDITOR.editor#drop} and {@link CKEDITOR.editor#dragend} events,
 * * The {@link CKEDITOR.plugins.clipboard.dataTransfer} class.
 *
 * @since 4.5.0
 * @event dragstart
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param data
 * @param {Object} data.$ Native dragstart event.
 * @param {CKEDITOR.dom.node} data.target Drag target.
 * @param {CKEDITOR.plugins.clipboard.dataTransfer} data.dataTransfer DataTransfer facade.
 */

/**
 * Facade for the native `dragend` event. Fired when the native `dragend` event occurs.
 *
 * Read more about integration with drag and drop in the {@glink guide/dev_clipboard Clipboard Deep Dive guide}.
 *
 * See also:
 *
 * * The {@link CKEDITOR.editor#paste} event,
 * * The {@link CKEDITOR.editor#drop} and {@link CKEDITOR.editor#dragend} events,
 * * The {@link CKEDITOR.plugins.clipboard.dataTransfer} class.
 *
 * @since 4.5.0
 * @event dragend
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param data
 * @param {Object} data.$ Native dragend event.
 * @param {CKEDITOR.dom.node} data.target Drag target.
 * @param {CKEDITOR.plugins.clipboard.dataTransfer} data.dataTransfer DataTransfer facade.
 */

/**
 * Defines a filter which is applied to external data pasted or dropped into the editor. Possible values are:
 *
 * * `'plain-text'` &ndash; Content will be pasted as a plain text.
 * * `'semantic-content'` &ndash; Known tags (except `div`, `span`) with all attributes (except
 * `style` and `class`) will be kept.
 * * `'h1 h2 p div'` &ndash; Custom rules compatible with {@link CKEDITOR.filter}.
 * * `null` &ndash; Content will not be filtered by the paste filter (but it still may be filtered
 * by {@glink guide/dev_advanced_content_filter Advanced Content Filter}). This value can be used to
 * disable the paste filter in Chrome and Safari, where this option defaults to `'semantic-content'`.
 *
 * Example:
 *
 *		config.pasteFilter = 'plain-text';
 *
 * Custom setting:
 *
 *		config.pasteFilter = 'h1 h2 p ul ol li; img[!src, alt]; a[!href]';
 *
 * Based on this configuration option, a proper {@link CKEDITOR.filter} instance will be defined and assigned to the editor
 * as a {@link CKEDITOR.editor#pasteFilter}. You can tweak the paste filter settings on the fly on this object
 * as well as delete or replace it.
 *
 *		var editor = CKEDITOR.replace( 'editor', {
 *			pasteFilter: 'semantic-content'
 *		} );
 *
 *		editor.on( 'instanceReady', function() {
 *			// The result of this will be that all semantic content will be preserved
 *			// except tables.
 *			editor.pasteFilter.disallow( 'table' );
 *		} );
 *
 * Note that the paste filter is applied only to **external** data. There are three data sources:
 *
 * * copied and pasted in the same editor (internal),
 * * copied from one editor and pasted into another (cross-editor),
 * * coming from all other sources like websites, MS Word, etc. (external).
 *
 * If {@link CKEDITOR.config#allowedContent Advanced Content Filter} is not disabled, then
 * it will also be applied to pasted and dropped data. The paste filter job is to "normalize"
 * external data which often needs to be handled differently than content produced by the editor.
 *
 * This setting defaults to `'semantic-content'` in Chrome, Opera and Safari (all Blink and Webkit based browsers)
 * due to messy HTML which these browsers keep in the clipboard. In other browsers it defaults to `null`.
 *
 * @since 4.5.0
 * @cfg {String} [pasteFilter='semantic-content' in Chrome and Safari and `null` in other browsers]
 * @member CKEDITOR.config
 */

/**
 * {@link CKEDITOR.filter Content filter} which is used when external data is pasted or dropped into the editor
 * or a forced paste as plain text occurs.
 *
 * This object might be used on the fly to define rules for pasted external content.
 * This object is available and used if the {@link CKEDITOR.plugins.clipboard clipboard} plugin is enabled and
 * {@link CKEDITOR.config#pasteFilter} or {@link CKEDITOR.config#forcePasteAsPlainText} was defined.
 *
 * To enable the filter:
 *
 *		var editor = CKEDITOR.replace( 'editor', {
 *			pasteFilter: 'plain-text'
 *		} );
 *
 * You can also modify the filter on the fly later on:
 *
 *		editor.pasteFilter = new CKEDITOR.filter( 'p h1 h2; a[!href]' );
 *
 * Note that the paste filter is only applied to **external** data. There are three data sources:
 *
 * * copied and pasted in the same editor (internal),
 * * copied from one editor and pasted into another (cross-editor),
 * * coming from all other sources like websites, MS Word, etc. (external).
 *
 * If {@link CKEDITOR.config#allowedContent Advanced Content Filter} is not disabled, then
 * it will also be applied to pasted and dropped data. The paste filter job is to "normalize"
 * external data which often needs to be handled differently than content produced by the editor.
 *
 * @since 4.5.0
 * @readonly
 * @property {CKEDITOR.filter} [pasteFilter]
 * @member CKEDITOR.editor
 */

/**
 * Duration of the notification displayed after pasting was blocked by the browser.
 *
 * @since 4.7.0
 * @cfg {Number} [clipboard_notificationDuration=10000]
 * @member CKEDITOR.config
 */
CKEDITOR.config.clipboard_notificationDuration = 10000;

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

CKEDITOR.plugins.add( 'panelbutton', {
	requires: 'button',
	onLoad: function() {
		function clickFn( editor ) {
			var _ = this._;

			if ( _.state == CKEDITOR.TRISTATE_DISABLED )
				return;

			this.createPanel( editor );

			if ( _.on ) {
				_.panel.hide();
				return;
			}

			_.panel.showBlock( this._.id, this.document.getById( this._.id ), 4 );
		}

		/**
		 * @class
		 * @extends CKEDITOR.ui.button
		 * @todo class and methods
		 */
		CKEDITOR.ui.panelButton = CKEDITOR.tools.createClass( {
			base: CKEDITOR.ui.button,

			/**
			 * Creates a panelButton class instance.
			 *
			 * @constructor
			 */
			$: function( definition ) {
				// We don't want the panel definition in this object.
				var panelDefinition = definition.panel || {};
				delete definition.panel;

				this.base( definition );

				this.document = ( panelDefinition.parent && panelDefinition.parent.getDocument() ) || CKEDITOR.document;

				panelDefinition.block = {
					attributes: panelDefinition.attributes
				};
				panelDefinition.toolbarRelated = true;

				this.hasArrow = 'listbox';

				this.click = clickFn;

				this._ = {
					panelDefinition: panelDefinition
				};
			},

			statics: {
				handler: {
					create: function( definition ) {
						return new CKEDITOR.ui.panelButton( definition );
					}
				}
			},

			proto: {
				createPanel: function( editor ) {
					var _ = this._;

					if ( _.panel )
						return;

					var panelDefinition = this._.panelDefinition,
						panelBlockDefinition = this._.panelDefinition.block,
						panelParentElement = panelDefinition.parent || CKEDITOR.document.getBody(),
						panel = this._.panel = new CKEDITOR.ui.floatPanel( editor, panelParentElement, panelDefinition ),
						block = panel.addBlock( _.id, panelBlockDefinition ),
						me = this;

					panel.onShow = function() {
						if ( me.className )
							this.element.addClass( me.className + '_panel' );

						me.setState( CKEDITOR.TRISTATE_ON );

						_.on = 1;

						me.editorFocus && editor.focus();

						if ( me.onOpen )
							me.onOpen();
					};

					panel.onHide = function( preventOnClose ) {
						if ( me.className )
							this.element.getFirst().removeClass( me.className + '_panel' );

						me.setState( me.modes && me.modes[ editor.mode ] ? CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED );

						_.on = 0;

						if ( !preventOnClose && me.onClose )
							me.onClose();
					};

					panel.onEscape = function() {
						panel.hide( 1 );
						me.document.getById( _.id ).focus();
					};

					if ( this.onBlock )
						this.onBlock( panel, block );

					block.onHide = function() {
						_.on = 0;
						me.setState( CKEDITOR.TRISTATE_OFF );
					};
				}
			}
		} );

	},
	beforeInit: function( editor ) {
		editor.ui.addHandler( CKEDITOR.UI_PANELBUTTON, CKEDITOR.ui.panelButton.handler );
	}
} );

/**
 * Button UI element.
 *
 * @readonly
 * @property {String} [='panelbutton']
 * @member CKEDITOR
 */
CKEDITOR.UI_PANELBUTTON = 'panelbutton';

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

( function() {
	CKEDITOR.plugins.add( 'panel', {
		beforeInit: function( editor ) {
			editor.ui.addHandler( CKEDITOR.UI_PANEL, CKEDITOR.ui.panel.handler );
		}
	} );

	/**
	 * Panel UI element.
	 *
	 * @readonly
	 * @property {String} [='panel']
	 * @member CKEDITOR
	 */
	CKEDITOR.UI_PANEL = 'panel';

	/**
	 * @class
	 * @constructor Creates a panel class instance.
	 * @param {CKEDITOR.dom.document} document
	 * @param {Object} definition
	 */
	CKEDITOR.ui.panel = function( document, definition ) {
		// Copy all definition properties to this object.
		if ( definition )
			CKEDITOR.tools.extend( this, definition );

		// Set defaults.
		CKEDITOR.tools.extend( this, {
			className: '',
			css: []
		} );

		this.id = CKEDITOR.tools.getNextId();
		this.document = document;
		this.isFramed = this.forceIFrame || this.css.length;

		this._ = {
			blocks: {}
		};
	};

	/**
	 * Represents panel handler object.
	 *
	 * @class
	 * @singleton
	 * @extends CKEDITOR.ui.handlerDefinition
	 */
	CKEDITOR.ui.panel.handler = {
		/**
		 * Transforms a panel definition in a {@link CKEDITOR.ui.panel} instance.
		 *
		 * @param {Object} definition
		 * @returns {CKEDITOR.ui.panel}
		 */
		create: function( definition ) {
			return new CKEDITOR.ui.panel( definition );
		}
	};

	var panelTpl = CKEDITOR.addTemplate( 'panel', '<div lang="{langCode}" id="{id}" dir={dir}' +
		' class="cke cke_reset_all {editorId} cke_panel cke_panel {cls} cke_{dir}"' +
		' style="z-index:{z-index}" role="presentation">' +
		'{frame}' +
		'</div>' );

	var frameTpl = CKEDITOR.addTemplate( 'panel-frame', '<iframe id="{id}" class="cke_panel_frame" role="presentation" frameborder="0" src="{src}"></iframe>' );

	var frameDocTpl = CKEDITOR.addTemplate( 'panel-frame-inner', '<!DOCTYPE html>' +
		'<html class="cke_panel_container {env}" dir="{dir}" lang="{langCode}">' +
			'<head>{css}</head>' +
			'<body class="cke_{dir}"' +
				' style="margin:0;padding:0" onload="{onload}"></body>' +
		'<\/html>' );

	/** @class CKEDITOR.ui.panel */
	CKEDITOR.ui.panel.prototype = {
		/**
		 * Renders the combo.
		 *
		 * @param {CKEDITOR.editor} editor The editor instance which this button is
		 * to be used by.
		 * @param {Array} [output] The output array to which append the HTML relative
		 * to this button.
		 */
		render: function( editor, output ) {
			var data = {
				editorId: editor.id,
				id: this.id,
				langCode: editor.langCode,
				dir: editor.lang.dir,
				cls: this.className,
				frame: '',
				env: CKEDITOR.env.cssClass,
				'z-index': editor.config.baseFloatZIndex + 1
			};

			this.getHolderElement = function() {
				var holder = this._.holder;

				if ( !holder ) {
					if ( this.isFramed ) {
						var iframe = this.document.getById( this.id + '_frame' ),
							parentDiv = iframe.getParent(),
							doc = iframe.getFrameDocument();

						// Make it scrollable on iOS. (https://dev.ckeditor.com/ticket/8308)
						CKEDITOR.env.iOS && parentDiv.setStyles( {
							'overflow': 'scroll',
							'-webkit-overflow-scrolling': 'touch'
						} );

						var onLoad = CKEDITOR.tools.addFunction( CKEDITOR.tools.bind( function() {
							this.isLoaded = true;
							if ( this.onLoad )
								this.onLoad();
						}, this ) );

						doc.write( frameDocTpl.output( CKEDITOR.tools.extend( {
							css: CKEDITOR.tools.buildStyleHtml( this.css ),
							onload: 'window.parent.CKEDITOR.tools.callFunction(' + onLoad + ');'
						}, data ) ) );

						var win = doc.getWindow();

						// Register the CKEDITOR global.
						win.$.CKEDITOR = CKEDITOR;

						// Arrow keys for scrolling is only preventable with 'keypress' event in Opera (https://dev.ckeditor.com/ticket/4534).
						doc.on( 'keydown', function( evt ) {
							var keystroke = evt.data.getKeystroke(),
								dir = this.document.getById( this.id ).getAttribute( 'dir' );

							// Arrow left and right should use native behaviour inside input element
							if ( evt.data.getTarget().getName() === 'input' && ( keystroke === 37 || keystroke === 39 ) ) {
								return;
							}
							// Delegate key processing to block.
							if ( this._.onKeyDown && this._.onKeyDown( keystroke ) === false ) {
								if ( !( evt.data.getTarget().getName() === 'input' && keystroke === 32 ) ) {
									// Don't prevent space when is pressed on a input filed.
									evt.data.preventDefault();
								}
								return;
							}

							// ESC/ARROW-LEFT(ltr) OR ARROW-RIGHT(rtl)
							if ( keystroke == 27 || keystroke == ( dir == 'rtl' ? 39 : 37 ) ) {
								if ( this.onEscape && this.onEscape( keystroke ) === false )
									evt.data.preventDefault();
							}
						}, this );

						holder = doc.getBody();
						holder.unselectable();
						CKEDITOR.env.air && CKEDITOR.tools.callFunction( onLoad );
					} else {
						holder = this.document.getById( this.id );
					}

					this._.holder = holder;
				}

				return holder;
			};

			if ( this.isFramed ) {
				// With IE, the custom domain has to be taken care at first,
				// for other browers, the 'src' attribute should be left empty to
				// trigger iframe's 'load' event.
				var src =
					CKEDITOR.env.air ? 'javascript:void(0)' : // jshint ignore:line
					( CKEDITOR.env.ie && !CKEDITOR.env.edge ) ? 'javascript:void(function(){' + encodeURIComponent( // jshint ignore:line
						'document.open();' +
						// In IE, the document domain must be set any time we call document.open().
						'(' + CKEDITOR.tools.fixDomain + ')();' +
						'document.close();'
					) + '}())' :
					'';

				data.frame = frameTpl.output( {
					id: this.id + '_frame',
					src: src
				} );
			}

			var html = panelTpl.output( data );

			if ( output )
				output.push( html );

			return html;
		},

		/**
		 * @todo
		 */
		addBlock: function( name, block ) {
			block = this._.blocks[ name ] = block instanceof CKEDITOR.ui.panel.block ? block : new CKEDITOR.ui.panel.block( this.getHolderElement(), block );

			if ( !this._.currentBlock )
				this.showBlock( name );

			return block;
		},

		/**
		 * @todo
		 */
		getBlock: function( name ) {
			return this._.blocks[ name ];
		},

		/**
		 * @todo
		 */
		showBlock: function( name ) {
			var blocks = this._.blocks,
				block = blocks[ name ],
				current = this._.currentBlock;

			// ARIA role works better in IE on the body element, while on the iframe
			// for FF. (https://dev.ckeditor.com/ticket/8864)
			var holder = !this.forceIFrame || CKEDITOR.env.ie ? this._.holder : this.document.getById( this.id + '_frame' );

			if ( current )
				current.hide();

			this._.currentBlock = block;

			CKEDITOR.fire( 'ariaWidget', holder );

			// Reset the focus index, so it will always go into the first one.
			block._.focusIndex = -1;

			this._.onKeyDown = block.onKeyDown && CKEDITOR.tools.bind( block.onKeyDown, block );

			block.show();

			return block;
		},

		/**
		 * @todo
		 */
		destroy: function() {
			this.element && this.element.remove();
		}
	};

	/**
	 * @class
	 *
	 * @todo class and all methods
	 */
	CKEDITOR.ui.panel.block = CKEDITOR.tools.createClass( {
		/**
		 * Creates a block class instances.
		 *
		 * @constructor
		 * @todo
		 */
		$: function( blockHolder, blockDefinition ) {
			this.element = blockHolder.append( blockHolder.getDocument().createElement( 'div', {
				attributes: {
					'tabindex': -1,
					'class': 'cke_panel_block'
				},
				styles: {
					display: 'none'
				}
			} ) );

			// Copy all definition properties to this object.
			if ( blockDefinition )
				CKEDITOR.tools.extend( this, blockDefinition );

			// Set the a11y attributes of this element ...
			this.element.setAttributes( {
				'role': this.attributes.role || 'presentation',
				'aria-label': this.attributes[ 'aria-label' ],
				'title': this.attributes.title || this.attributes[ 'aria-label' ]
			} );

			this.keys = {};

			this._.focusIndex = -1;

			// Disable context menu for panels.
			this.element.disableContextMenu();
		},

		_: {

			/**
			 * Mark the item specified by the index as current activated.
			 */
			markItem: function( index ) {
				if ( index == -1 )
					return;
				var focusables = this._.getItems();
				var item = focusables.getItem( this._.focusIndex = index );

				// Safari need focus on the iframe window first(https://dev.ckeditor.com/ticket/3389), but we need
				// lock the blur to avoid hiding the panel.
				if ( CKEDITOR.env.webkit )
					item.getDocument().getWindow().focus();
				item.focus();

				this.onMark && this.onMark( item );
			},

			/**
			 * Marks the first visible item or the one whose `aria-selected` attribute is set to `true`.
			 * The latter has priority over the former.
			 *
			 * @private
			 * @param beforeMark function to be executed just before marking.
			 * Used in cases when any preparatory cleanup (like unmarking all items) would simultaneously
			 * destroy the information that is needed to determine the focused item.
			 */
			markFirstDisplayed: function( beforeMark ) {
				var notDisplayed = function( element ) {
						return element.type == CKEDITOR.NODE_ELEMENT && element.getStyle( 'display' ) == 'none';
					},
					focusables = this._.getItems(),
					item, focused;

				for ( var i = focusables.count() - 1; i >= 0; i-- ) {
					item = focusables.getItem( i );

					if ( !item.getAscendant( notDisplayed ) ) {
						focused = item;
						this._.focusIndex = i;
					}

					if ( item.getAttribute( 'aria-selected' ) == 'true' ) {
						focused = item;
						this._.focusIndex = i;
						break;
					}
				}

				if ( !focused ) {
					return;
				}

				if ( beforeMark ) {
					beforeMark();
				}

				if ( CKEDITOR.env.webkit )
					focused.getDocument().getWindow().focus();
				focused.focus();

				this.onMark && this.onMark( focused );
			},

			/**
			 * Returns a `CKEDITOR.dom.nodeList` of block items.
			 *
			 * @returns {CKEDITOR.dom.nodeList}
			 */
			getItems: function() {
				return this.element.find( 'a,input' );
			}
		},

		proto: {
			show: function() {
				this.element.setStyle( 'display', '' );
			},

			hide: function() {
				if ( !this.onHide || this.onHide.call( this ) !== true )
					this.element.setStyle( 'display', 'none' );
			},

			onKeyDown: function( keystroke, noCycle ) {
				var keyAction = this.keys[ keystroke ];
				switch ( keyAction ) {
					// Move forward.
					case 'next':
						var index = this._.focusIndex,
							focusables = this._.getItems(),
							focusable;

						while ( ( focusable = focusables.getItem( ++index ) ) ) {
							// Move the focus only if the element is marked with
							// the _cke_focus and it it's visible (check if it has
							// width).
							if ( focusable.getAttribute( '_cke_focus' ) && focusable.$.offsetWidth ) {
								this._.focusIndex = index;
								focusable.focus( true );
								break;
							}
						}

						// If no focusable was found, cycle and restart from the top. (https://dev.ckeditor.com/ticket/11125)
						if ( !focusable && !noCycle ) {
							this._.focusIndex = -1;
							return this.onKeyDown( keystroke, 1 );
						}

						return false;

						// Move backward.
					case 'prev':
						index = this._.focusIndex;
						focusables = this._.getItems();

						while ( index > 0 && ( focusable = focusables.getItem( --index ) ) ) {
							// Move the focus only if the element is marked with
							// the _cke_focus and it it's visible (check if it has
							// width).
							if ( focusable.getAttribute( '_cke_focus' ) && focusable.$.offsetWidth ) {
								this._.focusIndex = index;
								focusable.focus( true );
								break;
							}

							// Make sure focusable is null when the loop ends and nothing was
							// found (https://dev.ckeditor.com/ticket/11125).
							focusable = null;
						}

						// If no focusable was found, cycle and restart from the bottom. (https://dev.ckeditor.com/ticket/11125)
						if ( !focusable && !noCycle ) {
							this._.focusIndex = focusables.count();
							return this.onKeyDown( keystroke, 1 );
						}

						return false;

					case 'click':
					case 'mouseup':
						index = this._.focusIndex;
						focusable = index >= 0 && this._.getItems().getItem( index );

						if ( focusable )
							focusable.$[ keyAction ] ? focusable.$[ keyAction ]() : focusable.$[ 'on' + keyAction ]();

						return false;
				}

				return true;
			}
		}
	} );

} )();

/**
 * Fired when a panel is added to the document.
 *
 * @event ariaWidget
 * @member CKEDITOR
 * @param {Object} data The element wrapping the panel.
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

CKEDITOR.plugins.add( 'floatpanel', {
	requires: 'panel'
} );

( function() {
	var panels = {};

	function getPanel( editor, doc, parentElement, definition, level ) {
		// Generates the panel key: docId-eleId-skinName-langDir[-uiColor][-CSSs][-level]
		var key = CKEDITOR.tools.genKey( doc.getUniqueId(), parentElement.getUniqueId(), editor.lang.dir, editor.uiColor || '', definition.css || '', level || '' ),
			panel = panels[ key ];

		if ( !panel ) {
			panel = panels[ key ] = new CKEDITOR.ui.panel( doc, definition );
			panel.element = parentElement.append( CKEDITOR.dom.element.createFromHtml( panel.render( editor ), doc ) );

			panel.element.setStyles( {
				display: 'none',
				position: 'absolute'
			} );
		}

		return panel;
	}

	/**
	 * Represents a floating panel UI element.
	 *
	 * It is reused by rich combos, color combos, menus, etc.
	 * and it renders its content using {@link CKEDITOR.ui.panel}.
	 *
	 * @class
	 * @todo
	 */
	CKEDITOR.ui.floatPanel = CKEDITOR.tools.createClass( {
		/**
		 * Creates a floatPanel class instance.
		 *
		 * @constructor
		 * @param {CKEDITOR.editor} editor
		 * @param {CKEDITOR.dom.element} parentElement
		 * @param {Object} definition Definition of the panel that will be floating.
		 * @param {Number} level
		 */
		$: function( editor, parentElement, definition, level ) {
			definition.forceIFrame = 1;

			// In case of editor with floating toolbar append panels that should float
			// to the main UI element.
			if ( definition.toolbarRelated && editor.elementMode == CKEDITOR.ELEMENT_MODE_INLINE )
				parentElement = CKEDITOR.document.getById( 'cke_' + editor.name );

			var doc = parentElement.getDocument(),
				panel = getPanel( editor, doc, parentElement, definition, level || 0 ),
				element = panel.element,
				iframe = element.getFirst(),
				that = this;

			// Disable native browser menu. (https://dev.ckeditor.com/ticket/4825)
			element.disableContextMenu();

			this.element = element;

			this._ = {
				editor: editor,
				// The panel that will be floating.
				panel: panel,
				parentElement: parentElement,
				definition: definition,
				document: doc,
				iframe: iframe,
				children: [],
				dir: editor.lang.dir,
				showBlockParams: null,
				markFirst: definition.markFirst !== undefined ? definition.markFirst : true
			};

			editor.on( 'mode', hide );
			editor.on( 'resize', hide );

			// When resize of the window is triggered floatpanel should be repositioned according to new dimensions.
			// https://dev.ckeditor.com/ticket/11724. Fixes issue with undesired panel hiding on Android and iOS.
			doc.getWindow().on( 'resize', function() {
				this.reposition();
			}, this );

			// We need a wrapper because events implementation doesn't allow to attach
			// one listener more than once for the same event on the same object.
			// Remember that floatPanel#hide is shared between all instances.
			function hide() {
				that.hide();
			}
		},

		proto: {
			/**
			 * @todo
			 */
			addBlock: function( name, block ) {
				return this._.panel.addBlock( name, block );
			},

			/**
			 * @todo
			 */
			addListBlock: function( name, multiSelect ) {
				return this._.panel.addListBlock( name, multiSelect );
			},

			/**
			 * @todo
			 */
			getBlock: function( name ) {
				return this._.panel.getBlock( name );
			},

			/**
			 * Shows the panel block.
			 *
			 * @param {String} name
			 * @param {CKEDITOR.dom.element} offsetParent Positioned parent.
			 * @param {Number} corner
			 *
			 * * For LTR (left to right) oriented editor:
			 *      * `1` = top-left
			 *      * `2` = top-right
			 *      * `3` = bottom-right
			 *      * `4` = bottom-left
			 * * For RTL (right to left):
			 *      * `1` = top-right
			 *      * `2` = top-left
			 *      * `3` = bottom-left
			 *      * `4` = bottom-right
			 *
			 * @param {Number} [offsetX=0]
			 * @param {Number} [offsetY=0]
			 * @param {Function} [callback] A callback function executed when block positioning is done.
			 * @todo what do exactly these params mean (especially corner)?
			 */
			showBlock: function( name, offsetParent, corner, offsetX, offsetY, callback ) {
				var panel = this._.panel,
					block = panel.showBlock( name );

				this._.showBlockParams = [].slice.call( arguments );
				this.allowBlur( false );

				// Record from where the focus is when open panel.
				var editable = this._.editor.editable();
				this._.returnFocus = editable.hasFocus ? editable : new CKEDITOR.dom.element( CKEDITOR.document.$.activeElement );
				this._.hideTimeout = 0;

				var element = this.element,
					iframe = this._.iframe,
					// Edge prefers iframe's window to the iframe, just like the rest of the browsers (https://dev.ckeditor.com/ticket/13143).
					focused = CKEDITOR.env.ie && !CKEDITOR.env.edge ? iframe : new CKEDITOR.dom.window( iframe.$.contentWindow ),
					doc = element.getDocument(),
					positionedAncestor = this._.parentElement.getPositionedAncestor(),
					position = offsetParent.getDocumentPosition( doc ),
					positionedAncestorPosition = positionedAncestor ? positionedAncestor.getDocumentPosition( doc ) : { x: 0, y: 0 },
					rtl = this._.dir == 'rtl',
					left = position.x + ( offsetX || 0 ) - positionedAncestorPosition.x,
					top = position.y + ( offsetY || 0 ) - positionedAncestorPosition.y;

				// Floating panels are off by (-1px, 0px) in RTL mode. (https://dev.ckeditor.com/ticket/3438)
				if ( rtl && ( corner == 1 || corner == 4 ) )
					left += offsetParent.$.offsetWidth;
				else if ( !rtl && ( corner == 2 || corner == 3 ) )
					left += offsetParent.$.offsetWidth - 1;

				if ( corner == 3 || corner == 4 )
					top += offsetParent.$.offsetHeight - 1;

				// Memorize offsetParent by it's ID.
				this._.panel._.offsetParentId = offsetParent.getId();

				element.setStyles( {
					top: top + 'px',
					left: 0,
					display: ''
				} );

				// Don't use display or visibility style because we need to
				// calculate the rendering layout later and focus the element.
				element.setOpacity( 0 );

				// To allow the context menu to decrease back their width
				element.getFirst().removeStyle( 'width' );

				// Report to focus manager.
				this._.editor.focusManager.add( focused );

				// Configure the IFrame blur event. Do that only once.
				if ( !this._.blurSet ) {

					// With addEventListener compatible browsers, we must
					// useCapture when registering the focus/blur events to
					// guarantee they will be firing in all situations. (https://dev.ckeditor.com/ticket/3068, https://dev.ckeditor.com/ticket/3222 )
					CKEDITOR.event.useCapture = true;

					focused.on( 'blur', function( ev ) {
						// As we are using capture to register the listener,
						// the blur event may get fired even when focusing
						// inside the window itself, so we must ensure the
						// target is out of it.
						if ( !this.allowBlur() || ev.data.getPhase() != CKEDITOR.EVENT_PHASE_AT_TARGET )
							return;

						if ( this.visible && !this._.activeChild ) {
							// [iOS] Allow hide to be prevented if touch is bound
							// to any parent of the iframe blur happens before touch (https://dev.ckeditor.com/ticket/10714).
							if ( CKEDITOR.env.iOS ) {
								if ( !this._.hideTimeout )
									this._.hideTimeout = CKEDITOR.tools.setTimeout( doHide, 0, this );
							} else {
								doHide.call( this );
							}
						}

						function doHide() {
							// Panel close is caused by user's navigating away the focus, e.g. click outside the panel.
							// DO NOT restore focus in this case.
							delete this._.returnFocus;
							this.hide();
						}
					}, this );

					focused.on( 'focus', function() {
						this._.focused = true;
						this.hideChild();
						this.allowBlur( true );
					}, this );

					// [iOS] if touch is bound to any parent of the iframe blur
					// happens twice before touchstart and before touchend (https://dev.ckeditor.com/ticket/10714).
					if ( CKEDITOR.env.iOS ) {
						// Prevent false hiding on blur.
						// We don't need to return focus here because touchend will fire anyway.
						// If user scrolls and pointer gets out of the panel area touchend will also fire.
						focused.on( 'touchstart', function() {
							clearTimeout( this._.hideTimeout );
						}, this );

						// Set focus back to handle blur and hide panel when needed.
						focused.on( 'touchend', function() {
							this._.hideTimeout = 0;
							this.focus();
						}, this );
					}

					CKEDITOR.event.useCapture = false;

					this._.blurSet = 1;
				}

				panel.onEscape = CKEDITOR.tools.bind( function( keystroke ) {
					if ( this.onEscape && this.onEscape( keystroke ) === false )
						return false;
				}, this );

				CKEDITOR.tools.setTimeout( function() {
					var panelLoad = CKEDITOR.tools.bind( function() {
						var target = element;

						// Reset panel width as the new content can be narrower
						// than the old one. (https://dev.ckeditor.com/ticket/9355)
						target.removeStyle( 'width' );

						if ( block.autoSize ) {
							var panelDoc = block.element.getDocument(),
								width = ( ( CKEDITOR.env.webkit || CKEDITOR.env.edge ) ? block.element : panelDoc.getBody() ).$.scrollWidth;

							// Account for extra height needed due to IE quirks box model bug:
							// http://en.wikipedia.org/wiki/Internet_Explorer_box_model_bug
							// (https://dev.ckeditor.com/ticket/3426)
							if ( CKEDITOR.env.ie && CKEDITOR.env.quirks && width > 0 )
								width += ( target.$.offsetWidth || 0 ) - ( target.$.clientWidth || 0 ) + 3;

							// Add some extra pixels to improve the appearance.
							width += 10;

							target.setStyle( 'width', width + 'px' );

							var height = block.element.$.scrollHeight;

							// Account for extra height needed due to IE quirks box model bug:
							// http://en.wikipedia.org/wiki/Internet_Explorer_box_model_bug
							// (https://dev.ckeditor.com/ticket/3426)
							if ( CKEDITOR.env.ie && CKEDITOR.env.quirks && height > 0 )
								height += ( target.$.offsetHeight || 0 ) - ( target.$.clientHeight || 0 ) + 3;

							target.setStyle( 'height', height + 'px' );

							// Fix IE < 8 visibility.
							panel._.currentBlock.element.setStyle( 'display', 'none' ).removeStyle( 'display' );
						} else {
							target.removeStyle( 'height' );
						}

						// Flip panel layout horizontally in RTL with known width.
						if ( rtl )
							left -= element.$.offsetWidth;

						// Pop the style now for measurement.
						element.setStyle( 'left', left + 'px' );

						/* panel layout smartly fit the viewport size. */
						var panelElement = panel.element,
							panelWindow = panelElement.getWindow(),
							rect = element.$.getBoundingClientRect(),
							viewportSize = panelWindow.getViewPaneSize();

						// Compensation for browsers that dont support "width" and "height".
						var rectWidth = rect.width || rect.right - rect.left,
							rectHeight = rect.height || rect.bottom - rect.top;

						// Check if default horizontal layout is impossible.
						var spaceAfter = rtl ? rect.right : viewportSize.width - rect.left,
							spaceBefore = rtl ? viewportSize.width - rect.right : rect.left;

						if ( rtl ) {
							if ( spaceAfter < rectWidth ) {
								// Flip to show on right.
								if ( spaceBefore > rectWidth )
									left += rectWidth;
								// Align to window left.
								else if ( viewportSize.width > rectWidth )
									left = left - rect.left;
								// Align to window right, never cutting the panel at right.
								else
									left = left - rect.right + viewportSize.width;
							}
						} else if ( spaceAfter < rectWidth ) {
							// Flip to show on left.
							if ( spaceBefore > rectWidth )
								left -= rectWidth;
							// Align to window right.
							else if ( viewportSize.width > rectWidth )
								left = left - rect.right + viewportSize.width;
							// Align to window left, never cutting the panel at left.
							else
								left = left - rect.left;
						}


						// Check if the default vertical layout is possible.
						var spaceBelow = viewportSize.height - rect.top,
							spaceAbove = rect.top;

						if ( spaceBelow < rectHeight ) {
							// Flip to show above.
							if ( spaceAbove > rectHeight )
								top -= rectHeight;
							// Align to window bottom.
							else if ( viewportSize.height > rectHeight )
								top = top - rect.bottom + viewportSize.height;
							// Align to top, never cutting the panel at top.
							else
								top = top - rect.top;
						}

						// If IE is in RTL, we have troubles with absolute
						// position and horizontal scrolls. Here we have a
						// series of hacks to workaround it. (https://dev.ckeditor.com/ticket/6146)
						if ( CKEDITOR.env.ie && !CKEDITOR.env.edge ) {
							var offsetParent = new CKEDITOR.dom.element( element.$.offsetParent ),
								scrollParent = offsetParent;

							// Quirks returns <body>, but standards returns <html>.
							if ( scrollParent.getName() == 'html' ) {
								scrollParent = scrollParent.getDocument().getBody();
							}

							if ( scrollParent.getComputedStyle( 'direction' ) == 'rtl' ) {
								// For IE8, there is not much logic on this, but it works.
								if ( CKEDITOR.env.ie8Compat ) {
									left -= element.getDocument().getDocumentElement().$.scrollLeft * 2;
								} else {
									left -= ( offsetParent.$.scrollWidth - offsetParent.$.clientWidth );
								}
							}
						}

						// Trigger the onHide event of the previously active panel to prevent
						// incorrect styles from being applied (https://dev.ckeditor.com/ticket/6170)
						var innerElement = element.getFirst(),
							activePanel;
						if ( ( activePanel = innerElement.getCustomData( 'activePanel' ) ) )
							activePanel.onHide && activePanel.onHide.call( this, 1 );
						innerElement.setCustomData( 'activePanel', this );

						element.setStyles( {
							top: top + 'px',
							left: left + 'px'
						} );
						element.setOpacity( 1 );

						callback && callback();
					}, this );

					panel.isLoaded ? panelLoad() : panel.onLoad = panelLoad;

					CKEDITOR.tools.setTimeout( function() {
						var scrollTop = CKEDITOR.env.webkit && CKEDITOR.document.getWindow().getScrollPosition().y;

						// Focus the panel frame first, so blur gets fired.
						this.focus();

						// Focus the block now.
						block.element.focus();

						// https://dev.ckeditor.com/ticket/10623, https://dev.ckeditor.com/ticket/10951 - restore the viewport's scroll position after focusing list element.
						if ( CKEDITOR.env.webkit )
							CKEDITOR.document.getBody().$.scrollTop = scrollTop;

						// We need this get fired manually because of unfired focus() function.
						this.allowBlur( true );

						// Ensure that the first item is focused (https://dev.ckeditor.com/ticket/16804).
						if ( this._.markFirst ) {
							if ( CKEDITOR.env.ie ) {
								CKEDITOR.tools.setTimeout( function() {
									block.markFirstDisplayed ? block.markFirstDisplayed() : block._.markFirstDisplayed();
								}, 0 );
							} else {
								block.markFirstDisplayed ? block.markFirstDisplayed() : block._.markFirstDisplayed();
							}
						}

						this._.editor.fire( 'panelShow', this );
					}, 0, this );
				}, CKEDITOR.env.air ? 200 : 0, this );
				this.visible = 1;

				if ( this.onShow )
					this.onShow.call( this );
			},

			/**
			 * Repositions the panel with the same parameters that were used in the last {@link #showBlock} call.
			 *
			 * @since 4.5.4
			 */
			reposition: function() {
				var blockParams = this._.showBlockParams;

				if ( this.visible && this._.showBlockParams ) {
					this.hide();
					this.showBlock.apply( this, blockParams );
				}
			},

			/**
			 * Restores the last focused element or simply focuses the panel window.
			 */
			focus: function() {
				// Webkit requires to blur any previous focused page element, in
				// order to properly fire the "focus" event.
				if ( CKEDITOR.env.webkit ) {
					var active = CKEDITOR.document.getActive();
					active && !active.equals( this._.iframe ) && active.$.blur();
				}

				// Restore last focused element or simply focus panel window.
				var focus = this._.lastFocused || this._.iframe.getFrameDocument().getWindow();
				focus.focus();
			},

			/**
			 * @todo
			 */
			blur: function() {
				var doc = this._.iframe.getFrameDocument(),
					active = doc.getActive();

				active && active.is( 'a' ) && ( this._.lastFocused = active );
			},

			/**
			 * Hides the panel.
			 *
			 * @todo
			 */
			hide: function( returnFocus ) {
				if ( this.visible && ( !this.onHide || this.onHide.call( this ) !== true ) ) {
					this.hideChild();
					// Blur previously focused element. (https://dev.ckeditor.com/ticket/6671)
					CKEDITOR.env.gecko && this._.iframe.getFrameDocument().$.activeElement.blur();
					this.element.setStyle( 'display', 'none' );
					this.visible = 0;
					this.element.getFirst().removeCustomData( 'activePanel' );

					// Return focus properly. (https://dev.ckeditor.com/ticket/6247)
					var focusReturn = returnFocus && this._.returnFocus;
					if ( focusReturn ) {
						// Webkit requires focus moved out panel iframe first.
						if ( CKEDITOR.env.webkit && focusReturn.type )
							focusReturn.getWindow().$.focus();

						focusReturn.focus();
					}

					delete this._.lastFocused;
					this._.showBlockParams = null;

					this._.editor.fire( 'panelHide', this );
				}
			},

			/**
			 * @todo
			 */
			allowBlur: function( allow ) {
				// Prevent editor from hiding the panel. (https://dev.ckeditor.com/ticket/3222)
				var panel = this._.panel;
				if ( allow !== undefined )
					panel.allowBlur = allow;

				return panel.allowBlur;
			},

			/**
			 * Shows the specified panel as a child of one block of this one.
			 *
			 * @param {CKEDITOR.ui.floatPanel} panel
			 * @param {String} blockName
			 * @param {CKEDITOR.dom.element} offsetParent Positioned parent.
			 * @param {Number} corner
			 *
			 * * For LTR (left to right) oriented editor:
			 *      * `1` = top-left
			 *      * `2` = top-right
			 *      * `3` = bottom-right
			 *      * `4` = bottom-left
			 * * For RTL (right to left):
			 *      * `1` = top-right
			 *      * `2` = top-left
			 *      * `3` = bottom-left
			 *      * `4` = bottom-right
			 *
			 * @param {Number} [offsetX=0]
			 * @param {Number} [offsetY=0]
			 * @todo
			 */
			showAsChild: function( panel, blockName, offsetParent, corner, offsetX, offsetY ) {
				// Skip reshowing of child which is already visible.
				if ( this._.activeChild == panel && panel._.panel._.offsetParentId == offsetParent.getId() )
					return;

				this.hideChild();

				panel.onHide = CKEDITOR.tools.bind( function() {
					// Use a timeout, so we give time for this menu to get
					// potentially focused.
					CKEDITOR.tools.setTimeout( function() {
						if ( !this._.focused )
							this.hide();
					}, 0, this );
				}, this );

				this._.activeChild = panel;
				this._.focused = false;

				panel.showBlock( blockName, offsetParent, corner, offsetX, offsetY );
				this.blur();

				/* https://dev.ckeditor.com/ticket/3767 IE: Second level menu may not have borders */
				if ( CKEDITOR.env.ie7Compat || CKEDITOR.env.ie6Compat ) {
					setTimeout( function() {
						panel.element.getChild( 0 ).$.style.cssText += '';
					}, 100 );
				}
			},

			/**
			 * @todo
			 */
			hideChild: function( restoreFocus ) {
				var activeChild = this._.activeChild;

				if ( activeChild ) {
					delete activeChild.onHide;
					delete this._.activeChild;
					activeChild.hide();

					// At this point focus should be moved back to parent panel.
					restoreFocus && this.focus();
				}
			}
		}
	} );

	CKEDITOR.on( 'instanceDestroyed', function() {
		var isLastInstance = CKEDITOR.tools.isEmpty( CKEDITOR.instances );

		for ( var i in panels ) {
			var panel = panels[ i ];
			// Safe to destroy it since there're no more instances.(https://dev.ckeditor.com/ticket/4241)
			if ( isLastInstance )
				panel.destroy();
			// Panel might be used by other instances, just hide them.(https://dev.ckeditor.com/ticket/4552)
			else
				panel.element.hide();
		}
		// Remove the registration.
		isLastInstance && ( panels = {} );

	} );
} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview The "colorbutton" plugin that makes it possible to assign
 *               text and background colors to editor contents.
 *
 */
CKEDITOR.plugins.add( 'colorbutton', {
	requires: 'panelbutton,floatpanel',
	// jscs:disable maximumLineLength
	// jscs:enable maximumLineLength
	init: function( editor ) {
		var config = editor.config,
			lang = editor.lang.colorbutton;

		if ( !CKEDITOR.env.hc ) {
			addButton( 'TextColor', 'fore', lang.textColorTitle, 10, {
				contentTransformations: [
					[
						{
							element: 'font',
							check: 'span{color}',
							left: function( element ) {
								return !!element.attributes.color;
							},
							right: function( element ) {
								element.name = 'span';

								element.attributes.color && ( element.styles.color = element.attributes.color );
								delete element.attributes.color;
							}
						}
					]
				]
			} );

			var  bgOptions = {},
				normalizeBackground = editor.config.colorButton_normalizeBackground;

			if ( normalizeBackground === undefined || normalizeBackground ) {
				// If background contains only color, then we want to convert it into background-color so that it's
				// correctly picked by colorbutton plugin.
				bgOptions.contentTransformations = [
					[
						{
							// Transform span that specify background with color only to background-color.
							element: 'span',
							left: function( element ) {
								var tools = CKEDITOR.tools;
								if ( element.name != 'span' || !element.styles || !element.styles.background ) {
									return false;
								}

								var background = tools.style.parse.background( element.styles.background );

								// We return true only if background specifies **only** color property, and there's only one background directive.
								return background.color && tools.object.keys( background ).length === 1;
							},
							right: function( element ) {
								var style = new CKEDITOR.style( editor.config.colorButton_backStyle, {
										color: element.styles.background
									} ),
									definition = style.getDefinition();

								// Align the output object with the template used in config.
								element.name = definition.element;
								element.styles = definition.styles;
								element.attributes = definition.attributes || {};

								return element;
							}
						}
					]
				];
			}

			addButton( 'BGColor', 'back', lang.bgColorTitle, 20, bgOptions );
		}

		function addButton( name, type, title, order, options ) {
			var style = new CKEDITOR.style( config[ 'colorButton_' + type + 'Style' ] ),
				colorBoxId = CKEDITOR.tools.getNextId() + '_colorBox',
				colorData = { type: type },
				panelBlock;

			options = options || {};

			editor.ui.add( name, CKEDITOR.UI_PANELBUTTON, {
				label: title,
				title: title,
				modes: { wysiwyg: 1 },
				editorFocus: 0,
				toolbar: 'colors,' + order,
				allowedContent: style,
				requiredContent: style,
				contentTransformations: options.contentTransformations,

				panel: {
					css: CKEDITOR.skin.getPath( 'editor' ),
					attributes: { role: 'listbox', 'aria-label': lang.panelTitle }
				},

				onBlock: function( panel, block ) {
					panelBlock = block;

					block.autoSize = true;
					block.element.addClass( 'cke_colorblock' );
					block.element.setHtml( renderColors( panel, type, colorBoxId, colorData ) );
					// The block should not have scrollbars (https://dev.ckeditor.com/ticket/5933, https://dev.ckeditor.com/ticket/6056)
					block.element.getDocument().getBody().setStyle( 'overflow', 'hidden' );

					CKEDITOR.ui.fire( 'ready', this );

					var keys = block.keys;
					var rtl = editor.lang.dir == 'rtl';
					keys[ rtl ? 37 : 39 ] = 'next'; // ARROW-RIGHT
					keys[ 40 ] = 'next'; // ARROW-DOWN
					keys[ 9 ] = 'next'; // TAB
					keys[ rtl ? 39 : 37 ] = 'prev'; // ARROW-LEFT
					keys[ 38 ] = 'prev'; // ARROW-UP
					keys[ CKEDITOR.SHIFT + 9 ] = 'prev'; // SHIFT + TAB
					keys[ 32 ] = 'click'; // SPACE
				},

				refresh: function() {
					if ( !editor.activeFilter.check( style ) ) {
						this.setState( CKEDITOR.TRISTATE_DISABLED );
					}
				},

				// The automatic colorbox should represent the real color (https://dev.ckeditor.com/ticket/6010)
				onOpen: function() {

					var selection = editor.getSelection(),
						block = selection && selection.getStartElement(),
						path = editor.elementPath( block ),
						automaticColor;

					if ( !path ) {
						return;
					}

					// Find the closest block element.
					block = path.block || path.blockLimit || editor.document.getBody();

					// The background color might be transparent. In that case, look up the color in the DOM tree.
					do {
						automaticColor = block && block.getComputedStyle( type == 'back' ? 'background-color' : 'color' ) || 'transparent';
					}
					while ( type == 'back' && automaticColor == 'transparent' && block && ( block = block.getParent() ) );

					// The box should never be transparent.
					if ( !automaticColor || automaticColor == 'transparent' ) {
						automaticColor = '#ffffff';
					}

					if ( config.colorButton_enableAutomatic !== false ) {
						this._.panel._.iframe.getFrameDocument().getById( colorBoxId ).setStyle( 'background-color', automaticColor );
					}

					var range = selection && selection.getRanges()[ 0 ];

					if ( range ) {
						var walker = new CKEDITOR.dom.walker( range ),
							element = range.collapsed ? range.startContainer : walker.next(),
							finalColor = '',
							currentColor;

						while ( element ) {
							// (#2296)
							if ( element.type !== CKEDITOR.NODE_ELEMENT ) {
								element = element.getParent();
							}

							currentColor = normalizeColor( element.getComputedStyle( type == 'back' ? 'background-color' : 'color'  ) );
							finalColor = finalColor || currentColor;

							if ( finalColor !== currentColor ) {
								finalColor = '';
								break;
							}

							element = walker.next();
						}

						if ( finalColor == 'transparent' ) {
							finalColor = '';
						}
						if ( type == 'fore' ) {
							colorData.automaticTextColor = '#' + normalizeColor( automaticColor );
						}
						colorData.selectionColor = finalColor ? '#' + finalColor : '';

						selectColor( panelBlock, finalColor );
					}

					return automaticColor;
				}
			} );
		}

		function renderColors( panel, type, colorBoxId, colorData ) {
			var output = [],
				colors = config.colorButton_colors.split( ',' ),
				colorsPerRow = config.colorButton_colorsPerRow || 6,
				// Tells if we should include "More Colors..." button.
				moreColorsEnabled = editor.plugins.colordialog && config.colorButton_enableMore !== false,
				// aria-setsize and aria-posinset attributes are used to indicate size of options, because
				// screen readers doesn't play nice with table, based layouts (https://dev.ckeditor.com/ticket/12097).
				total = colors.length + ( moreColorsEnabled ? 2 : 1 );

			var clickFn = CKEDITOR.tools.addFunction( function applyColorStyle( color, type ) {

				editor.focus();
				editor.fire( 'saveSnapshot' );

				if ( color == '?' ) {
					editor.getColorFromDialog( function( color ) {
						if ( color ) {
							return setColor( color );
						}
					}, null, colorData );
				} else {
					return setColor( color && '#' + color );
				}

				function setColor( color ) {
					var colorStyle = config[ 'colorButton_' + type + 'Style' ];
					// Clean up any conflicting style within the range.
					editor.removeStyle( new CKEDITOR.style( colorStyle, { color: 'inherit' } ) );

					colorStyle.childRule = type == 'back' ?
					function( element ) {
						// It's better to apply background color as the innermost style. (https://dev.ckeditor.com/ticket/3599)
						// Except for "unstylable elements". (https://dev.ckeditor.com/ticket/6103)
						return isUnstylable( element );
					} : function( element ) {
						// Fore color style must be applied inside links instead of around it. (https://dev.ckeditor.com/ticket/4772,https://dev.ckeditor.com/ticket/6908)
						return !( element.is( 'a' ) || element.getElementsByTag( 'a' ).count() ) || isUnstylable( element );
					};

					editor.focus();
					if ( color ) {
						editor.applyStyle( new CKEDITOR.style( colorStyle, { color: color } ) );
					}
					editor.fire( 'saveSnapshot' );
				}

			} );

			if ( config.colorButton_enableAutomatic !== false ) {
				// Render the "Automatic" button.
				output.push( '<a class="cke_colorauto" _cke_focus=1 hidefocus=true' +
					' title="', lang.auto, '"' +
					' draggable="false"' +
					' ondragstart="return false;"' + // Draggable attribute is buggy on Firefox.
					' onclick="CKEDITOR.tools.callFunction(', clickFn, ',null,\'', type, '\');return false;"' +
					' href="javascript:void(\'', lang.auto, '\')"' +
					' role="option" aria-posinset="1" aria-setsize="', total, '">' +
						'<table role="presentation" cellspacing=0 cellpadding=0 width="100%">' +
							'<tr>' +
								'<td colspan="' + colorsPerRow + '" align="center"><span class="cke_colorbox" id="', colorBoxId, '"></span>', lang.auto, '</td>' +
							'</tr>' +
						'</table>' +
					'</a>' );
			}
			output.push( '<table role="presentation" cellspacing=0 cellpadding=0 width="100%">' );

			// Render the color boxes.
			for ( var i = 0; i < colors.length; i++ ) {
				if ( ( i % colorsPerRow ) === 0 )
					output.push( '</tr><tr>' );

				var parts = colors[ i ].split( '/' ),
					colorName = parts[ 0 ],
					colorCode = parts[ 1 ] || colorName,
					colorLabel;

				// The data can be only a color code (without #) or colorName + color code
				// If only a color code is provided, then the colorName is the color with the hash
				// Convert the color from RGB to RRGGBB for better compatibility with IE and <font>. See https://dev.ckeditor.com/ticket/5676
				// Additionally, if the data is a single color code then let's try to translate it or fallback on the
				// color code. If the data is a color name/code, then use directly the color name provided.
				if ( !parts[ 1 ] ) {
					colorLabel = editor.lang.colorbutton.colors[ colorCode ] || colorCode;
				} else {
					colorLabel = colorName;
				}

				output.push( '<td>' +
					'<a class="cke_colorbox" _cke_focus=1 hidefocus=true' +
						' title="', colorLabel, '"' +
						' draggable="false"' +
						' ondragstart="return false;"' + // Draggable attribute is buggy on Firefox.
						' onclick="CKEDITOR.tools.callFunction(', clickFn, ',\'', colorCode, '\',\'', type, '\'); return false;"' +
						' href="javascript:void(\'', colorCode, '\')"' +
						' data-value="' + colorCode + '"' +
						' role="option" aria-posinset="', ( i + 2 ), '" aria-setsize="', total, '">' +
						'<span class="cke_colorbox" style="background-color:#', colorCode, '"></span>' +
					'</a>' +
					'</td>' );
			}

			// Render the "More Colors" button.
			if ( moreColorsEnabled ) {
				output.push( '</tr>' +
					'<tr>' +
						'<td colspan="' + colorsPerRow + '" align="center">' +
							'<a class="cke_colormore" _cke_focus=1 hidefocus=true' +
								' title="', lang.more, '"' +
								' draggable="false"' +
								' ondragstart="return false;"' + // Draggable attribute is buggy on Firefox.
								' onclick="CKEDITOR.tools.callFunction(', clickFn, ',\'?\',\'', type, '\');return false;"' +
								' href="javascript:void(\'', lang.more, '\')"', ' role="option" aria-posinset="', total, '" aria-setsize="', total, '">', lang.more, '</a>' +
						'</td>' ); // tr is later in the code.
			}

			output.push( '</tr></table>' );

			return output.join( '' );
		}

		function isUnstylable( ele ) {
			return ( ele.getAttribute( 'contentEditable' ) == 'false' ) || ele.getAttribute( 'data-nostyle' );
		}

		/*
		 * Selects the specified color in the specified panel block.
		 *
		 * @private
		 * @member CKEDITOR.plugins.colorbutton
		 * @param {CKEDITOR.ui.panel.block} block
		 * @param {String} color
		 */
		function selectColor( block, color ) {
			var items = block._.getItems();

			for ( var i = 0; i < items.count(); i++ ) {
				var item = items.getItem( i );

				item.removeAttribute( 'aria-selected' );

				if ( color && color == normalizeColor( item.getAttribute( 'data-value' ) ) ) {
					item.setAttribute( 'aria-selected', true );
				}
			}
		}

		/*
		 * Converts a CSS color value to an easily comparable form.
		 *
		 * @private
		 * @member CKEDITOR.plugins.colorbutton
		 * @param {String} color
		 * @returns {String}
		 */
		function normalizeColor( color ) {
			// Replace 3-character hexadecimal notation with a 6-character hexadecimal notation (#1008).
			return CKEDITOR.tools.normalizeHex( '#' + CKEDITOR.tools.convertRgbToHex( color || '' ) ).replace( /#/g, '' );
		}
	}
} );

/**
 * Whether to enable the **More Colors** button in the color selectors.
 *
 * Read more in the {@glink features/colorbutton documentation}
 * and see the {@glink examples/colorbutton example}.
 *
 *		config.colorButton_enableMore = false;
 *
 * @cfg {Boolean} [colorButton_enableMore=true]
 * @member CKEDITOR.config
 */

/**
 * Defines the colors to be displayed in the color selectors. This is a string
 * containing hexadecimal notation for HTML colors, without the `'#'` prefix.
 *
 * **Since 3.3:** A color name may optionally be defined by prefixing the entries with
 * a name and the slash character. For example, `'FontColor1/FF9900'` will be
 * displayed as the color `#FF9900` in the selector, but will be output as `'FontColor1'`.
 * **This behaviour was altered in version 4.12.0.**
 *
 * **Since 4.6.2:** The default color palette has changed. It contains fewer colors in more
 * pastel shades than the previous one.
 *
 * **Since 4.12.0:** Defining colors with names works in a different way. Colors names can be defined
 * by `colorName/colorCode`. The color name is only used in the tooltip. The output will now use the color code.
 * For example, `FontColor/FF9900` will be displayed as the color `#FF9900` in the selector, and will
 * be output as `#FF9900`.
 *
 * Read more in the {@glink features/colorbutton documentation}
 * and see the {@glink examples/colorbutton example}.
 *
 *		// Brazil colors only.
 *		config.colorButton_colors = '00923E,F8C100,28166F';
 *
 *		config.colorButton_colors = 'FontColor1/FF9900,FontColor2/0066CC,FontColor3/F00';
 *
 *		// CKEditor color palette available before version 4.6.2.
 *		config.colorButton_colors =
 *			'000,800000,8B4513,2F4F4F,008080,000080,4B0082,696969,' +
 *			'B22222,A52A2A,DAA520,006400,40E0D0,0000CD,800080,808080,' +
 *			'F00,FF8C00,FFD700,008000,0FF,00F,EE82EE,A9A9A9,' +
 *			'FFA07A,FFA500,FFFF00,00FF00,AFEEEE,ADD8E6,DDA0DD,D3D3D3,' +
 *			'FFF0F5,FAEBD7,FFFFE0,F0FFF0,F0FFFF,F0F8FF,E6E6FA,FFF';
 *
 * @cfg {String} [colorButton_colors=see source]
 * @member CKEDITOR.config
 */
CKEDITOR.config.colorButton_colors = '1ABC9C,2ECC71,3498DB,9B59B6,4E5F70,F1C40F,' +
	'16A085,27AE60,2980B9,8E44AD,2C3E50,F39C12,' +
	'E67E22,E74C3C,ECF0F1,95A5A6,DDD,FFF,' +
	'D35400,C0392B,BDC3C7,7F8C8D,999,000';

/**
 * Stores the style definition that applies the text foreground color.
 *
 * Read more in the {@glink features/colorbutton documentation}
 * and see the {@glink examples/colorbutton example}.
 *
 *		// This is actually the default value.
 *		config.colorButton_foreStyle = {
 *			element: 'span',
 *			styles: { color: '#(color)' }
 *		};
 *
 * @cfg [colorButton_foreStyle=see source]
 * @member CKEDITOR.config
 */
CKEDITOR.config.colorButton_foreStyle = {
	element: 'span',
	styles: { 'color': '#(color)' },
	overrides: [ {
		element: 'font', attributes: { 'color': null }
	} ]
};

/**
 * Stores the style definition that applies the text background color.
 *
 * Read more in the {@glink features/colorbutton documentation}
 * and see the {@glink examples/colorbutton example}.
 *
 *		// This is actually the default value.
 *		config.colorButton_backStyle = {
 *			element: 'span',
 *			styles: { 'background-color': '#(color)' }
 *		};
 *
 * @cfg [colorButton_backStyle=see source]
 * @member CKEDITOR.config
 */
CKEDITOR.config.colorButton_backStyle = {
	element: 'span',
	styles: { 'background-color': '#(color)' }
};

/**
 * Whether to enable the **Automatic** button in the color selectors.
 *
 * Read more in the {@glink features/colorbutton documentation}
 * and see the {@glink examples/colorbutton example}.
 *
 *		config.colorButton_enableAutomatic = false;
 *
 * @cfg {Boolean} [colorButton_enableAutomatic=true]
 * @member CKEDITOR.config
 */

/**
 * Defines how many colors will be shown per row in the color selectors.
 *
 * Read more in the {@glink features/colorbutton documentation}
 * and see the {@glink examples/colorbutton example}.
 *
 *		config.colorButton_colorsPerRow = 8;
 *
 * @since 4.6.2
 * @cfg {Number} [colorButton_colorsPerRow=6]
 * @member CKEDITOR.config
 */

/**
 * Whether the plugin should convert `background` CSS properties with color only, to a `background-color` property,
 * allowing the [Color Button](https://ckeditor.com/cke4/addon/colorbutton) plugin to edit these styles.
 *
 *		config.colorButton_normalizeBackground = false;
 *
 * @since 4.6.1
 * @cfg {Boolean} [colorButton_normalizeBackground=true]
 * @member CKEDITOR.config
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

( function() {

	function setupAdvParams( element ) {
		var attrName = this.att;

		var value = element && element.hasAttribute( attrName ) && element.getAttribute( attrName ) || '';

		if ( value !== undefined )
			this.setValue( value );
	}

	function commitAdvParams() {
		// Dialogs may use different parameters in the commit list, so, by
		// definition, we take the first CKEDITOR.dom.element available.
		var element;

		for ( var i = 0; i < arguments.length; i++ ) {
			if ( arguments[ i ] instanceof CKEDITOR.dom.element ) {
				element = arguments[ i ];
				break;
			}
		}

		if ( element ) {
			var attrName = this.att,
				value = this.getValue();

			if ( value )
				element.setAttribute( attrName, value );
			else
				element.removeAttribute( attrName, value );
		}
	}

	var defaultTabConfig = { id: 1, dir: 1, classes: 1, styles: 1 };

	CKEDITOR.plugins.add( 'dialogadvtab', {
		requires: 'dialog',

		// Returns allowed content rule for the content created by this plugin.
		allowedContent: function( tabConfig ) {
			if ( !tabConfig )
				tabConfig = defaultTabConfig;

			var allowedAttrs = [];
			if ( tabConfig.id )
				allowedAttrs.push( 'id' );
			if ( tabConfig.dir )
				allowedAttrs.push( 'dir' );

			var allowed = '';

			if ( allowedAttrs.length )
				allowed += '[' + allowedAttrs.join( ',' ) +  ']';

			if ( tabConfig.classes )
				allowed += '(*)';
			if ( tabConfig.styles )
				allowed += '{*}';

			return allowed;
		},

		// @param tabConfig
		// id, dir, classes, styles
		createAdvancedTab: function( editor, tabConfig, element ) {
			if ( !tabConfig )
				tabConfig = defaultTabConfig;

			var lang = editor.lang.common;

			var result = {
				id: 'advanced',
				label: lang.advancedTab,
				title: lang.advancedTab,
				elements: [ {
					type: 'vbox',
					padding: 1,
					children: []
				} ]
			};

			var contents = [];

			if ( tabConfig.id || tabConfig.dir ) {
				if ( tabConfig.id ) {
					contents.push( {
						id: 'advId',
						att: 'id',
						type: 'text',
						requiredContent: element ? element + '[id]' : null,
						label: lang.id,
						setup: setupAdvParams,
						commit: commitAdvParams
					} );
				}

				if ( tabConfig.dir ) {
					contents.push( {
						id: 'advLangDir',
						att: 'dir',
						type: 'select',
						requiredContent: element ? element + '[dir]' : null,
						label: lang.langDir,
						'default': '',
						style: 'width:100%',
						items: [
							[ lang.notSet, '' ],
							[ lang.langDirLTR, 'ltr' ],
							[ lang.langDirRTL, 'rtl' ]
						],
						setup: setupAdvParams,
						commit: commitAdvParams
					} );
				}

				result.elements[ 0 ].children.push( {
					type: 'hbox',
					widths: [ '50%', '50%' ],
					children: [].concat( contents )
				} );
			}

			if ( tabConfig.styles || tabConfig.classes ) {
				contents = [];

				if ( tabConfig.styles ) {
					contents.push( {
						id: 'advStyles',
						att: 'style',
						type: 'text',
						requiredContent: element ? element + '{cke-xyz}' : null,
						label: lang.styles,
						'default': '',

						validate: CKEDITOR.dialog.validate.inlineStyle( lang.invalidInlineStyle ),
						onChange: function() {},

						getStyle: function( name, defaultValue ) {
							var match = this.getValue().match( new RegExp( '(?:^|;)\\s*' + name + '\\s*:\\s*([^;]*)', 'i' ) );
							return match ? match[ 1 ] : defaultValue;
						},

						updateStyle: function( name, value ) {
							var styles = this.getValue();

							var tmp = editor.document.createElement( 'span' );
							tmp.setAttribute( 'style', styles );
							tmp.setStyle( name, value );
							styles = CKEDITOR.tools.normalizeCssText( tmp.getAttribute( 'style' ) );

							this.setValue( styles, 1 );
						},

						setup: setupAdvParams,

						commit: commitAdvParams

					} );
				}

				if ( tabConfig.classes ) {
					contents.push( {
						type: 'hbox',
						widths: [ '45%', '55%' ],
						children: [ {
							id: 'advCSSClasses',
							att: 'class',
							type: 'text',
							requiredContent: element ? element + '(cke-xyz)' : null,
							label: lang.cssClasses,
							'default': '',
							setup: setupAdvParams,
							commit: commitAdvParams

						} ]
					} );
				}

				result.elements[ 0 ].children.push( {
					type: 'hbox',
					widths: [ '50%', '50%' ],
					children: [].concat( contents )
				} );
			}

			return result;
		}
	} );

} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview The "div" plugin. It wraps the selected block level elements with a 'div' element with specified styles and attributes.
 *
 */

( function() {
	CKEDITOR.plugins.add( 'div', {
		requires: 'dialog',
		// jscs:disable maximumLineLength
		// jscs:enable maximumLineLength
		init: function( editor ) {
			if ( editor.blockless )
				return;

			var lang = editor.lang.div,
				allowed = 'div(*)';

			if ( CKEDITOR.dialog.isTabEnabled( editor, 'editdiv', 'advanced' ) )
				allowed += ';div[dir,id,lang,title]{*}';

			editor.addCommand( 'creatediv', new CKEDITOR.dialogCommand( 'creatediv', {
				allowedContent: allowed,
				requiredContent: 'div',
				contextSensitive: true,
				contentTransformations: [
					[ 'div: alignmentToStyle' ]
				],
				refresh: function( editor, path ) {
					var context = editor.config.div_wrapTable ? path.root : path.blockLimit;
					this.setState( 'div' in context.getDtd() ? CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED );
				}
			} ) );

			editor.addCommand( 'editdiv', new CKEDITOR.dialogCommand( 'editdiv', { requiredContent: 'div' } ) );
			editor.addCommand( 'removediv', {
				requiredContent: 'div',
				exec: function( editor ) {
					var selection = editor.getSelection(),
						ranges = selection && selection.getRanges(),
						range,
						bookmarks = selection.createBookmarks(),
						walker,
						toRemove = [];

					function findDiv( node ) {
						var div = CKEDITOR.plugins.div.getSurroundDiv( editor, node );
						if ( div && !div.data( 'cke-div-added' ) ) {
							toRemove.push( div );
							div.data( 'cke-div-added' );
						}
					}

					for ( var i = 0; i < ranges.length; i++ ) {
						range = ranges[ i ];
						if ( range.collapsed )
							findDiv( selection.getStartElement() );
						else {
							walker = new CKEDITOR.dom.walker( range );
							walker.evaluator = findDiv;
							walker.lastForward();
						}
					}

					for ( i = 0; i < toRemove.length; i++ )
						toRemove[ i ].remove( true );

					selection.selectBookmarks( bookmarks );
				}
			} );

			editor.ui.addButton && editor.ui.addButton( 'CreateDiv', {
				label: lang.toolbar,
				command: 'creatediv',
				toolbar: 'blocks,50'
			} );

			if ( editor.addMenuItems ) {
				editor.addMenuItems( {
					editdiv: {
						label: lang.edit,
						command: 'editdiv',
						group: 'div',
						order: 1
					},

					removediv: {
						label: lang.remove,
						command: 'removediv',
						group: 'div',
						order: 5
					}
				} );

				if ( editor.contextMenu ) {
					editor.contextMenu.addListener( function( element ) {
						if ( !element || element.isReadOnly() )
							return null;


						if ( CKEDITOR.plugins.div.getSurroundDiv( editor ) ) {
							return {
								editdiv: CKEDITOR.TRISTATE_OFF,
								removediv: CKEDITOR.TRISTATE_OFF
							};
						}

						return null;
					} );
				}
			}

			CKEDITOR.dialog.add( 'creatediv', this.path + 'dialogs/div.js' );
			CKEDITOR.dialog.add( 'editdiv', this.path + 'dialogs/div.js' );
		}
	} );

	CKEDITOR.plugins.div = {
		getSurroundDiv: function( editor, start ) {
			var path = editor.elementPath( start );
			return editor.elementPath( path.blockLimit ).contains( function( node ) {
				// Avoid read-only (i.e. contenteditable="false") divs (https://dev.ckeditor.com/ticket/11083).
				return node.is( 'div' ) && !node.isReadOnly();
			}, 1 );
		}
	};
} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview The "elementspath" plugin. It shows all elements in the DOM
 *		parent tree relative to the current selection in the editing area.
 */

( function() {
	var commands = {
		toolbarFocus: {
			editorFocus: false,
			readOnly: 1,
			exec: function( editor ) {
				var idBase = editor._.elementsPath.idBase;
				var element = CKEDITOR.document.getById( idBase + '0' );

				// Make the first button focus accessible for IE. (https://dev.ckeditor.com/ticket/3417)
				// Adobe AIR instead need while of delay.
				element && element.focus( CKEDITOR.env.ie || CKEDITOR.env.air );
			}
		}
	};

	var emptyHtml = '<span class="cke_path_empty">&nbsp;</span>';

	var extra = '';

	// Some browsers don't cancel key events in the keydown but in the
	// keypress.
	// TODO: Check if really needed.
	if ( CKEDITOR.env.gecko && CKEDITOR.env.mac )
		extra += ' onkeypress="return false;"';

	// With Firefox, we need to force the button to redraw, otherwise it
	// will remain in the focus state.
	if ( CKEDITOR.env.gecko )
		extra += ' onblur="this.style.cssText = this.style.cssText;"';

	var pathItemTpl = CKEDITOR.addTemplate( 'pathItem', '<a' +
		' id="{id}"' +
		' href="{jsTitle}"' +
		' tabindex="-1"' +
		' class="cke_path_item"' +
		' title="{label}"' +
		extra +
		' hidefocus="true" ' +
		' draggable="false" ' +
		' ondragstart="return false;"' + // Required by Firefox (#1191).
		' onkeydown="return CKEDITOR.tools.callFunction({keyDownFn},{index}, event );"' +
		' onclick="CKEDITOR.tools.callFunction({clickFn},{index}); return false;"' +
		' role="button" aria-label="{label}">' +
		'{text}' +
		'</a>' );

	CKEDITOR.plugins.add( 'elementspath', {
		// jscs:disable maximumLineLength
		// jscs:enable maximumLineLength
		init: function( editor ) {
			editor._.elementsPath = {
				idBase: 'cke_elementspath_' + CKEDITOR.tools.getNextNumber() + '_',
				filters: []
			};

			editor.on( 'uiSpace', function( event ) {
				if ( event.data.space == 'bottom' )
					initElementsPath( editor, event.data );
			} );
		}
	} );

	function initElementsPath( editor, bottomSpaceData ) {
		var spaceId = editor.ui.spaceId( 'path' ),
			spaceElement,
			getSpaceElement = function() {
				if ( !spaceElement )
					spaceElement = CKEDITOR.document.getById( spaceId );
				return spaceElement;
			},
			elementsPath = editor._.elementsPath,
			idBase = elementsPath.idBase;

		bottomSpaceData.html += '<span id="' + spaceId + '_label" class="cke_voice_label">' + editor.lang.elementspath.eleLabel + '</span>' +
			'<span id="' + spaceId + '" class="cke_path" role="group" aria-labelledby="' + spaceId + '_label">' + emptyHtml + '</span>';

		// Register the ui element to the focus manager.
		editor.on( 'uiReady', function() {
			var element = editor.ui.space( 'path' );
			element && editor.focusManager.add( element, 1 );
		} );

		function onClick( elementIndex ) {
			var element = elementsPath.list[ elementIndex ],
				selection;

			if ( element.equals( editor.editable() ) || element.getAttribute( 'contenteditable' ) == 'true' ) {
				var range = editor.createRange();
				range.selectNodeContents( element );

				selection = range.select();
			} else {
				selection = editor.getSelection();
				selection.selectElement( element );
			}

			// Explicitly fire selectionChange when clicking on an element path button. (https://dev.ckeditor.com/ticket/13548)
			if ( CKEDITOR.env.ie ) {
				editor.fire( 'selectionChange', { selection: selection, path: new CKEDITOR.dom.elementPath( element ) } );
			}

			// It is important to focus() *after* the above selection
			// manipulation, otherwise Firefox will have troubles. https://dev.ckeditor.com/ticket/10119
			editor.focus();
		}

		elementsPath.onClick = onClick;

		var onClickHanlder = CKEDITOR.tools.addFunction( onClick ),
			onKeyDownHandler = CKEDITOR.tools.addFunction( function( elementIndex, ev ) {
				var idBase = elementsPath.idBase,
					element;

				ev = new CKEDITOR.dom.event( ev );

				var rtl = editor.lang.dir == 'rtl';
				switch ( ev.getKeystroke() ) {
					case rtl ? 39 : 37: // LEFT-ARROW
					case 9: // TAB
						element = CKEDITOR.document.getById( idBase + ( elementIndex + 1 ) );
						if ( !element )
							element = CKEDITOR.document.getById( idBase + '0' );
						element.focus();
						return false;

					case rtl ? 37 : 39: // RIGHT-ARROW
					case CKEDITOR.SHIFT + 9: // SHIFT + TAB
						element = CKEDITOR.document.getById( idBase + ( elementIndex - 1 ) );
						if ( !element )
							element = CKEDITOR.document.getById( idBase + ( elementsPath.list.length - 1 ) );
						element.focus();
						return false;

					case 27: // ESC
						editor.focus();
						return false;

					case 13: // ENTER	// Opera
					case 32: // SPACE
						onClick( elementIndex );
						return false;
				}
				return true;
			} );

		editor.on( 'selectionChange', function( evt ) {
			var html = [],
				elementsList = elementsPath.list = [],
				namesList = [],
				filters = elementsPath.filters,
				isContentEditable = true,

				// Use elementPath to consider children of editable only (https://dev.ckeditor.com/ticket/11124).
				// Use elementPath from event (instead of editor.elementPath()), which is accurate in all cases (#801).
				elementsChain = evt.data.path.elements,
				name;

			// Starts iteration from body element, skipping html.
			for ( var j = elementsChain.length; j--; ) {
				var element = elementsChain[ j ],
					ignore = 0;

				if ( element.data( 'cke-display-name' ) )
					name = element.data( 'cke-display-name' );
				else if ( element.data( 'cke-real-element-type' ) )
					name = element.data( 'cke-real-element-type' );
				else
					name = element.getName();

				isContentEditable = element.hasAttribute( 'contenteditable' ) ?
					element.getAttribute( 'contenteditable' ) == 'true' : isContentEditable;

				// If elem is non-contenteditable, and it's not specifying contenteditable
				// attribute - then elem should be ignored.
				if ( !isContentEditable && !element.hasAttribute( 'contenteditable' ) )
					ignore = 1;

				for ( var i = 0; i < filters.length; i++ ) {
					var ret = filters[ i ]( element, name );
					if ( ret === false ) {
						ignore = 1;
						break;
					}
					name = ret || name;
				}

				if ( !ignore ) {
					elementsList.unshift( element );
					namesList.unshift( name );
				}
			}

			for ( var iterationLimit = elementsList.length, index = 0; index < iterationLimit; index++ ) {
				name = namesList[ index ];
				var label = editor.lang.elementspath.eleTitle.replace( /%1/, name ),
					item = pathItemTpl.output( {
						id: idBase + index,
						label: label,
						text: name,
						jsTitle: 'javascript:void(\'' + name + '\')', // jshint ignore:line
						index: index,
						keyDownFn: onKeyDownHandler,
						clickFn: onClickHanlder
					} );

				html.unshift( item );
			}

			var space = getSpaceElement();
			space.setHtml( html.join( '' ) + emptyHtml );
			editor.fire( 'elementsPathUpdate', { space: space } );
		} );

		function empty() {
			spaceElement && spaceElement.setHtml( emptyHtml );
			delete elementsPath.list;
		}

		editor.on( 'readOnly', empty );
		editor.on( 'contentDomUnload', empty );

		editor.addCommand( 'elementsPathFocus', commands.toolbarFocus );
		editor.setKeystroke( CKEDITOR.ALT + 122 /*F11*/, 'elementsPathFocus' );
	}
} )();

/**
 * Fired when the contents of the elementsPath are changed.
 *
 * @event elementsPathUpdate
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param data
 * @param {CKEDITOR.dom.element} data.space The elementsPath container.
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

( function() {
	CKEDITOR.plugins.add( 'enterkey', {
		init: function( editor ) {
			editor.addCommand( 'enter', {
				modes: { wysiwyg: 1 },
				editorFocus: false,
				exec: function( editor ) {
					enter( editor );
				}
			} );

			editor.addCommand( 'shiftEnter', {
				modes: { wysiwyg: 1 },
				editorFocus: false,
				exec: function( editor ) {
					shiftEnter( editor );
				}
			} );

			editor.setKeystroke( [
				[ 13, 'enter' ],
				[ CKEDITOR.SHIFT + 13, 'shiftEnter' ]
			] );
		}
	} );

	var whitespaces = CKEDITOR.dom.walker.whitespaces(),
		bookmark = CKEDITOR.dom.walker.bookmark(),
		plugin,
		enterBr,
		enterBlock,
		headerTagRegex;

	CKEDITOR.plugins.enterkey = {
		enterBlock: function( editor, mode, range, forceMode ) {
			// Get the range for the current selection.
			range = range || getRange( editor );

			// We may not have valid ranges to work on, like when inside a
			// contenteditable=false element.
			if ( !range )
				return;

			// When range is in nested editable, we have to replace range with this one,
			// which have root property set to closest editable, to make auto paragraphing work. (https://dev.ckeditor.com/ticket/12162)
			range = replaceRangeWithClosestEditableRoot( range );

			var doc = range.document;

			var atBlockStart = range.checkStartOfBlock(),
				atBlockEnd = range.checkEndOfBlock(),
				path = editor.elementPath( range.startContainer ),
				block = path.block,

				// Determine the block element to be used.
				blockTag = ( mode == CKEDITOR.ENTER_DIV ? 'div' : 'p' ),

				newBlock;

			if ( block && atBlockStart && atBlockEnd ) {
				var blockParent = block.getParent();

				// Block placeholder breaks list structure (#2205).
				if ( blockParent.is( 'li' ) && blockParent.getChildCount() > 1 ) {
					var placeholder = new CKEDITOR.dom.element( 'li' ),
						newRange = editor.createRange();

					placeholder.insertAfter( blockParent );

					block.remove();

					newRange.setStart( placeholder, 0 );
					editor.getSelection().selectRanges( [ newRange ] );

					return;
				}
				// Exit the list when we're inside an empty list item block. (https://dev.ckeditor.com/ticket/5376).
				else if ( block.is( 'li' ) || block.getParent().is( 'li' ) ) {
					// Make sure to point to the li when dealing with empty list item.
					if ( !block.is( 'li' ) ) {
						block = block.getParent();
						blockParent = block.getParent();
					}

					var blockGrandParent = blockParent.getParent(),

						firstChild = !block.hasPrevious(),
						lastChild = !block.hasNext(),

						selection = editor.getSelection(),
						bookmarks = selection.createBookmarks(),

						orgDir = block.getDirection( 1 ),
						className = block.getAttribute( 'class' ),
						style = block.getAttribute( 'style' ),
						dirLoose = blockGrandParent.getDirection( 1 ) != orgDir,

						enterMode = editor.enterMode,
						needsBlock = enterMode != CKEDITOR.ENTER_BR || dirLoose || style || className,

						child;

					if ( blockGrandParent.is( 'li' ) ) {

						// If block is the first or the last child of the parent
						// list, degrade it and move to the outer list:
						// before the parent list if block is first child and after
						// the parent list if block is the last child, respectively.
						//
						//  <ul>                         =>      <ul>
						//      <li>                     =>          <li>
						//          <ul>                 =>              <ul>
						//              <li>x</li>       =>                  <li>x</li>
						//              <li>^</li>       =>              </ul>
						//          </ul>                =>          </li>
						//      </li>                    =>          <li>^</li>
						//  </ul>                        =>      </ul>
						//
						//                              AND
						//
						//  <ul>                         =>      <ul>
						//      <li>                     =>          <li>^</li>
						//          <ul>                 =>          <li>
						//              <li>^</li>       =>              <ul>
						//              <li>x</li>       =>                  <li>x</li>
						//          </ul>                =>              </ul>
						//      </li>                    =>          </li>
						//  </ul>                        =>      </ul>

						if ( firstChild || lastChild ) {

							// If it's only child, we don't want to keep perent ul anymore.
							if ( firstChild && lastChild ) {
								blockParent.remove();
							}

							block[lastChild ? 'insertAfter' : 'insertBefore']( blockGrandParent );

							// If the empty block is neither first nor last child
							// then split the list and the block as an element
							// of outer list.
							//
							//                              =>      <ul>
							//                              =>          <li>
							//  <ul>                        =>              <ul>
							//      <li>                    =>                  <li>x</li>
							//          <ul>                =>              </ul>
							//              <li>x</li>      =>          </li>
							//              <li>^</li>      =>          <li>^</li>
							//              <li>y</li>      =>          <li>
							//          </ul>               =>              <ul>
							//      </li>                   =>                  <li>y</li>
							//  </ul>                       =>              </ul>
							//                              =>          </li>
							//                              =>      </ul>

						} else {
							block.breakParent( blockGrandParent );
						}
					}

					else if ( !needsBlock ) {
						block.appendBogus( true );

						// If block is the first or last child of the parent
						// list, move all block's children out of the list:
						// before the list if block is first child and after the list
						// if block is the last child, respectively.
						//
						//  <ul>                       =>      <ul>
						//      <li>x</li>             =>          <li>x</li>
						//      <li>^</li>             =>      </ul>
						//  </ul>                      =>      ^
						//
						//                            AND
						//
						//  <ul>                       =>      ^
						//      <li>^</li>             =>      <ul>
						//      <li>x</li>             =>          <li>x</li>
						//  </ul>                      =>      </ul>

						if ( firstChild || lastChild ) {
							while ( ( child = block[ firstChild ? 'getFirst' : 'getLast' ]() ) )
								child[ firstChild ? 'insertBefore' : 'insertAfter' ]( blockParent );
						}

						// If the empty block is neither first nor last child
						// then split the list and put all the block contents
						// between two lists.
						//
						//  <ul>                       =>      <ul>
						//      <li>x</li>             =>          <li>x</li>
						//      <li>^</li>             =>      </ul>
						//      <li>y</li>             =>      ^
						//  </ul>                      =>      <ul>
						//                             =>          <li>y</li>
						//                             =>      </ul>

						else {
							block.breakParent( blockParent );

							while ( ( child = block.getLast() ) )
								child.insertAfter( blockParent );
						}

						block.remove();
					} else {
						// Original path block is the list item, create new block for the list item content.
						if ( path.block.is( 'li' ) ) {
							// Use <div> block for ENTER_BR and ENTER_DIV.
							newBlock = doc.createElement( mode == CKEDITOR.ENTER_P ? 'p' : 'div' );

							if ( dirLoose )
								newBlock.setAttribute( 'dir', orgDir );

							style && newBlock.setAttribute( 'style', style );
							className && newBlock.setAttribute( 'class', className );

							// Move all the child nodes to the new block.
							block.moveChildren( newBlock );
						}
						// The original path block is not a list item, just copy the block to out side of the list.
						else {
							newBlock = path.block;
						}

						// If block is the first or last child of the parent
						// list, move it out of the list:
						// before the list if block is first child and after the list
						// if block is the last child, respectively.
						//
						//  <ul>                       =>      <ul>
						//      <li>x</li>             =>          <li>x</li>
						//      <li>^</li>             =>      </ul>
						//  </ul>                      =>      <p>^</p>
						//
						//                            AND
						//
						//  <ul>                       =>      <p>^</p>
						//      <li>^</li>             =>      <ul>
						//      <li>x</li>             =>          <li>x</li>
						//  </ul>                      =>      </ul>

						if ( firstChild || lastChild )
							newBlock[ firstChild ? 'insertBefore' : 'insertAfter' ]( blockParent );

						// If the empty block is neither first nor last child
						// then split the list and put the new block between
						// two lists.
						//
						//                             =>       <ul>
						//     <ul>                    =>           <li>x</li>
						//         <li>x</li>          =>       </ul>
						//         <li>^</li>          =>       <p>^</p>
						//         <li>y</li>          =>       <ul>
						//     </ul>                   =>           <li>y</li>
						//                             =>       </ul>

						else {
							block.breakParent( blockParent );
							newBlock.insertAfter( blockParent );
						}

						block.remove();
					}

					selection.selectBookmarks( bookmarks );

					return;
				}

				if ( block && block.getParent().is( 'blockquote' ) ) {
					block.breakParent( block.getParent() );

					// If we were at the start of <blockquote>, there will be an empty element before it now.
					if ( !block.getPrevious().getFirst( CKEDITOR.dom.walker.invisible( 1 ) ) )
						block.getPrevious().remove();

					// If we were at the end of <blockquote>, there will be an empty element after it now.
					if ( !block.getNext().getFirst( CKEDITOR.dom.walker.invisible( 1 ) ) )
						block.getNext().remove();

					range.moveToElementEditStart( block );
					range.select();
					return;
				}
			}
			// Don't split <pre> if we're in the middle of it, act as shift enter key.
			else if ( block && block.is( 'pre' ) ) {
				if ( !atBlockEnd ) {
					enterBr( editor, mode, range, forceMode );
					return;
				}
			}

			// Split the range.
			var splitInfo = range.splitBlock( blockTag );

			if ( !splitInfo )
				return;

			// Get the current blocks.
			var previousBlock = splitInfo.previousBlock,
				nextBlock = splitInfo.nextBlock;

			var isStartOfBlock = splitInfo.wasStartOfBlock,
				isEndOfBlock = splitInfo.wasEndOfBlock;

			var node;

			// If this is a block under a list item, split it as well. (https://dev.ckeditor.com/ticket/1647)
			if ( nextBlock ) {
				node = nextBlock.getParent();
				if ( node.is( 'li' ) ) {
					nextBlock.breakParent( node );
					nextBlock.move( nextBlock.getNext(), 1 );
				}
			} else if ( previousBlock && ( node = previousBlock.getParent() ) && node.is( 'li' ) ) {
				previousBlock.breakParent( node );
				node = previousBlock.getNext();
				range.moveToElementEditStart( node );
				previousBlock.move( previousBlock.getPrevious() );
			}
			// If we have both the previous and next blocks, it means that the
			// boundaries were on separated blocks, or none of them where on the
			// block limits (start/end).
			if ( !isStartOfBlock && !isEndOfBlock ) {
				// If the next block is an <li> with another list tree as the first
				// child, we'll need to append a filler (<br>/NBSP) or the list item
				// wouldn't be editable. (https://dev.ckeditor.com/ticket/1420)
				if ( nextBlock.is( 'li' ) ) {
					var walkerRange = range.clone();
					walkerRange.selectNodeContents( nextBlock );
					var walker = new CKEDITOR.dom.walker( walkerRange );
					walker.evaluator = function( node ) {
						return !( bookmark( node ) || whitespaces( node ) || node.type == CKEDITOR.NODE_ELEMENT && node.getName() in CKEDITOR.dtd.$inline && !( node.getName() in CKEDITOR.dtd.$empty ) );
					};

					node = walker.next();
					if ( node && node.type == CKEDITOR.NODE_ELEMENT && node.is( 'ul', 'ol' ) )
						( CKEDITOR.env.needsBrFiller ? doc.createElement( 'br' ) : doc.createText( '\xa0' ) ).insertBefore( node );
				}

				// Move the selection to the end block.
				if ( nextBlock )
					range.moveToElementEditStart( nextBlock );
			}
			// Handle differently when content of table cell was erased by pressing enter (#1816).
			// We don't want to add new block, because it was created with range.splitBlock().
			else if ( preventExtraLineInsideTable( mode ) ) {
				range.moveToElementEditStart( range.getTouchedStartNode() );
			} else {

				var newBlockDir;

				if ( previousBlock ) {
					// Do not enter this block if it's a header tag, or we are in
					// a Shift+Enter (https://dev.ckeditor.com/ticket/77). Create a new block element instead
					// (later in the code).
					if ( previousBlock.is( 'li' ) || !( headerTagRegex.test( previousBlock.getName() ) || previousBlock.is( 'pre' ) ) ) {
						// Otherwise, duplicate the previous block.
						newBlock = previousBlock.clone();
					}
				} else if ( nextBlock ) {
					newBlock = nextBlock.clone();
				}

				if ( !newBlock ) {
					// We have already created a new list item. (https://dev.ckeditor.com/ticket/6849)
					if ( node && node.is( 'li' ) )
						newBlock = node;
					else {
						newBlock = doc.createElement( blockTag );
						if ( previousBlock && ( newBlockDir = previousBlock.getDirection() ) )
							newBlock.setAttribute( 'dir', newBlockDir );
					}
				}
				// Force the enter block unless we're talking of a list item.
				else if ( forceMode && !newBlock.is( 'li' ) ) {
					newBlock.renameNode( blockTag );
				}

				// Recreate the inline elements tree, which was available
				// before hitting enter, so the same styles will be available in
				// the new block.
				var elementPath = splitInfo.elementPath;
				if ( elementPath ) {
					for ( var i = 0, len = elementPath.elements.length; i < len; i++ ) {
						var element = elementPath.elements[ i ];

						if ( element.equals( elementPath.block ) || element.equals( elementPath.blockLimit ) )
							break;

						if ( CKEDITOR.dtd.$removeEmpty[ element.getName() ] ) {
							element = element.clone();
							newBlock.moveChildren( element );
							newBlock.append( element );
						}
					}
				}

				newBlock.appendBogus();

				if ( !newBlock.getParent() )
					range.insertNode( newBlock );

				// list item start number should not be duplicated (https://dev.ckeditor.com/ticket/7330), but we need
				// to remove the attribute after it's onto the DOM tree because of old IEs (https://dev.ckeditor.com/ticket/7581).
				newBlock.is( 'li' ) && newBlock.removeAttribute( 'value' );

				// This is tricky, but to make the new block visible correctly
				// we must select it.
				// The previousBlock check has been included because it may be
				// empty if we have fixed a block-less space (like ENTER into an
				// empty table cell).
				if ( CKEDITOR.env.ie && isStartOfBlock && ( !isEndOfBlock || !previousBlock.getChildCount() ) ) {
					// Move the selection to the new block.
					range.moveToElementEditStart( isEndOfBlock ? previousBlock : newBlock );
					range.select();
				}

				// Move the selection to the new block.
				range.moveToElementEditStart( isStartOfBlock && !isEndOfBlock ? nextBlock : newBlock );
			}

			range.select();
			range.scrollIntoView();

			// ===== HELPERS =====
			function preventExtraLineInsideTable( mode ) {
				// #1816
				// We want to have behaviour after pressing enter like this:
				// 1. <td>^</td> -> <td><p> </p></td>
				// 2. <td>Foo^</td> -> <td><p>Foo</p><p> </p></td>
				// 3. <td>Foo^Bar</td> -> <td><p>Foo</p><p>Bar</p></td>
				// We need to separate 1. case to not add extra line. Like it happen for 2nd or 3rd option.

				var innerElement,
					bogus;

				if ( mode === CKEDITOR.ENTER_BR ) {
					return false;
				}

				if ( CKEDITOR.tools.indexOf( [ 'td', 'th' ], path.lastElement.getName() ) === -1 ) {
					return false;
				}
				if ( path.lastElement.getChildCount() !== 1 ) {
					return false;
				}

				innerElement = path.lastElement.getChild( 0 ).clone( true );
				bogus = innerElement.getBogus();
				if ( bogus ) {
					bogus.remove();
				}

				if ( innerElement.getText().length ) {
					return false;
				}

				return true;
			}
		},

		enterBr: function( editor, mode, range, forceMode ) {
			// Get the range for the current selection.
			range = range || getRange( editor );

			// We may not have valid ranges to work on, like when inside a
			// contenteditable=false element.
			if ( !range )
				return;

			var doc = range.document;

			var isEndOfBlock = range.checkEndOfBlock();

			var elementPath = new CKEDITOR.dom.elementPath( editor.getSelection().getStartElement() );

			var startBlock = elementPath.block,
				startBlockTag = startBlock && elementPath.block.getName();

			if ( !forceMode && startBlockTag == 'li' ) {
				enterBlock( editor, mode, range, forceMode );
				return;
			}

			// If we are at the end of a header block.
			if ( !forceMode && isEndOfBlock && headerTagRegex.test( startBlockTag ) ) {
				var newBlock, newBlockDir;

				if ( ( newBlockDir = startBlock.getDirection() ) ) {
					newBlock = doc.createElement( 'div' );
					newBlock.setAttribute( 'dir', newBlockDir );
					newBlock.insertAfter( startBlock );
					range.setStart( newBlock, 0 );
				} else {
					// Insert a <br> after the current paragraph.
					doc.createElement( 'br' ).insertAfter( startBlock );

					// A text node is required by Gecko only to make the cursor blink.
					if ( CKEDITOR.env.gecko )
						doc.createText( '' ).insertAfter( startBlock );

					// IE has different behaviors regarding position.
					range.setStartAt( startBlock.getNext(), CKEDITOR.env.ie ? CKEDITOR.POSITION_BEFORE_START : CKEDITOR.POSITION_AFTER_START );
				}
			} else {
				var lineBreak;

				// IE<8 prefers text node as line-break inside of <pre> (https://dev.ckeditor.com/ticket/4711).
				if ( startBlockTag == 'pre' && CKEDITOR.env.ie && CKEDITOR.env.version < 8 )
					lineBreak = doc.createText( '\r' );
				else
					lineBreak = doc.createElement( 'br' );

				range.deleteContents();
				range.insertNode( lineBreak );

				// Old IEs have different behavior regarding position.
				if ( !CKEDITOR.env.needsBrFiller )
					range.setStartAt( lineBreak, CKEDITOR.POSITION_AFTER_END );
				else {
					// A text node is required by Gecko only to make the cursor blink.
					// We need some text inside of it, so the bogus <br> is properly
					// created.
					doc.createText( '\ufeff' ).insertAfter( lineBreak );

					// If we are at the end of a block, we must be sure the bogus node is available in that block.
					if ( isEndOfBlock ) {
						// In most situations we've got an elementPath.block (e.g. <p>), but in a
						// blockless editor or when autoP is false that needs to be a block limit.
						( startBlock || elementPath.blockLimit ).appendBogus();
					}

					// Now we can remove the text node contents, so the caret doesn't
					// stop on it.
					lineBreak.getNext().$.nodeValue = '';

					range.setStartAt( lineBreak.getNext(), CKEDITOR.POSITION_AFTER_START );

				}
			}

			// This collapse guarantees the cursor will be blinking.
			range.collapse( true );

			range.select();
			range.scrollIntoView();
		}
	};

	plugin = CKEDITOR.plugins.enterkey;
	enterBr = plugin.enterBr;
	enterBlock = plugin.enterBlock;
	headerTagRegex = /^h[1-6]$/;

	function shiftEnter( editor ) {
		// On SHIFT+ENTER:
		// 1. We want to enforce the mode to be respected, instead
		// of cloning the current block. (https://dev.ckeditor.com/ticket/77)
		return enter( editor, editor.activeShiftEnterMode, 1 );
	}

	function enter( editor, mode, forceMode ) {
		forceMode = editor.config.forceEnterMode || forceMode;

		// Only effective within document.
		if ( editor.mode != 'wysiwyg' )
			return;

		if ( !mode )
			mode = editor.activeEnterMode;

		// TODO this should be handled by setting editor.activeEnterMode on selection change.
		// Check path block specialities:
		// 1. Cannot be a un-splittable element, e.g. table caption;
		var path = editor.elementPath();

		if ( path && !path.isContextFor( 'p' ) ) {
			mode = CKEDITOR.ENTER_BR;
			forceMode = 1;
		}

		editor.fire( 'saveSnapshot' ); // Save undo step.

		if ( mode == CKEDITOR.ENTER_BR )
			enterBr( editor, mode, null, forceMode );
		else
			enterBlock( editor, mode, null, forceMode );

		editor.fire( 'saveSnapshot' );
	}

	function getRange( editor ) {
		// Get the selection ranges.
		var ranges = editor.getSelection().getRanges( true );

		// Delete the contents of all ranges except the first one.
		for ( var i = ranges.length - 1; i > 0; i-- ) {
			ranges[ i ].deleteContents();
		}

		// Return the first range.
		return ranges[ 0 ];
	}

	function replaceRangeWithClosestEditableRoot( range ) {
		var closestEditable = range.startContainer.getAscendant( function( node ) {
			return node.type == CKEDITOR.NODE_ELEMENT && node.getAttribute( 'contenteditable' ) == 'true';
		}, true );

		if ( range.root.equals( closestEditable ) ) {
			return range;
		} else {
			var newRange = new CKEDITOR.dom.range( closestEditable );

			newRange.moveToRange( range );
			return newRange;
		}
	}
} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

( function() {
	var win = CKEDITOR.document.getWindow(),
		pixelate = CKEDITOR.tools.cssLength;

	CKEDITOR.plugins.add( 'floatingspace', {
		init: function( editor ) {
			// Add listener with lower priority than that in themedui creator.
			// Thereby floatingspace will be created only if themedui wasn't used.
			editor.on( 'loaded', function() {
				attach( this );
			}, null, null, 20 );
		}
	} );

	function scrollOffset( side ) {
		var pageOffset = side == 'left' ? 'pageXOffset' : 'pageYOffset',
			docScrollOffset = side == 'left' ? 'scrollLeft' : 'scrollTop';

		return ( pageOffset in win.$ ) ? win.$[ pageOffset ] : CKEDITOR.document.$.documentElement[ docScrollOffset ];
	}

	function attach( editor ) {
		var config = editor.config,

			// Get the HTML for the predefined spaces.
			topHtml = editor.fire( 'uiSpace', { space: 'top', html: '' } ).html,

			// Re-positioning of the space.
			layout = ( function() {
				// Mode indicates the vertical aligning mode.
				var mode, editable,
					spaceRect, editorRect, viewRect, spaceHeight, pageScrollX,

					// Allow minor adjustments of the float space from custom configs.
					dockedOffsetX = config.floatSpaceDockedOffsetX || 0,
					dockedOffsetY = config.floatSpaceDockedOffsetY || 0,
					pinnedOffsetX = config.floatSpacePinnedOffsetX || 0,
					pinnedOffsetY = config.floatSpacePinnedOffsetY || 0;

				// Update the float space position.
				function updatePos( pos, prop, val ) {
					floatSpace.setStyle( prop, pixelate( val ) );
					floatSpace.setStyle( 'position', pos );
				}

				// Change the current mode and update float space position accordingly.
				function changeMode( newMode ) {
					var editorPos = editable.getDocumentPosition();

					switch ( newMode ) {
						case 'top':
							updatePos( 'absolute', 'top', editorPos.y - spaceHeight - dockedOffsetY );
							break;
						case 'pin':
							updatePos( 'fixed', 'top', pinnedOffsetY );
							break;
						case 'bottom':
							updatePos( 'absolute', 'top', editorPos.y + ( editorRect.height || editorRect.bottom - editorRect.top ) + dockedOffsetY );
							break;
					}

					mode = newMode;
				}

				return function( evt ) {
					// https://dev.ckeditor.com/ticket/10112 Do not fail on editable-less editor.
					if ( !( editable = editor.editable() ) )
						return;

					var show = ( evt && evt.name == 'focus' );

					// Show up the space on focus gain.
					if ( show ) {
						floatSpace.show();
					}

					editor.fire( 'floatingSpaceLayout', { show: show } );

					// Reset the horizontal position for below measurement.
					floatSpace.removeStyle( 'left' );
					floatSpace.removeStyle( 'right' );

					// Compute the screen position from the TextRectangle object would
					// be very simple, even though the "width"/"height" property is not
					// available for all, it's safe to figure that out from the rest.

					// http://help.dottoro.com/ljgupwlp.php
					spaceRect = floatSpace.getClientRect();
					editorRect = editable.getClientRect();
					viewRect = win.getViewPaneSize();
					spaceHeight = spaceRect.height;
					pageScrollX = scrollOffset( 'left' );

					// We initialize it as pin mode.
					if ( !mode ) {
						mode = 'pin';
						changeMode( 'pin' );
						// Call for a refresh to the actual layout.
						layout( evt );
						return;
					}

					// +------------------------ Viewport -+ \
					// |                                   |  |-> floatSpaceDockedOffsetY
					// | ................................. | /
					// |                                   |
					// |   +------ Space -+                |
					// |   |              |                |
					// |   +--------------+                |
					// |   +------------------ Editor -+   |
					// |   |                           |   |
					//
					if ( spaceHeight + dockedOffsetY <= editorRect.top )
						changeMode( 'top' );

					//     +- - - - - - - - -  Editor -+
					//     |                           |
					// +------------------------ Viewport -+ \
					// |   |                           |   |  |-> floatSpacePinnedOffsetY
					// | ................................. | /
					// |   +------ Space -+            |   |
					// |   |              |            |   |
					// |   +--------------+            |   |
					// |   |                           |   |
					// |   +---------------------------+   |
					// +-----------------------------------+
					//
					else if ( spaceHeight + dockedOffsetY > viewRect.height - editorRect.bottom )
						changeMode( 'pin' );

					//     +- - - - - - - - -  Editor -+
					//     |                           |
					// +------------------------ Viewport -+ \
					// |   |                           |   |  |-> floatSpacePinnedOffsetY
					// | ................................. | /
					// |   |                           |   |
					// |   |                           |   |
					// |   +---------------------------+   |
					// |   +------ Space -+                |
					// |   |              |                |
					// |   +--------------+                |
					//
					else
						changeMode( 'bottom' );

					var mid = viewRect.width / 2,
						alignSide, offset;

					if ( config.floatSpacePreferRight ) {
						alignSide = 'right';
					} else if ( editorRect.left > 0 && editorRect.right < viewRect.width && editorRect.width > spaceRect.width ) {
						alignSide = config.contentsLangDirection == 'rtl' ? 'right' : 'left';
					} else {
						alignSide = mid - editorRect.left > editorRect.right - mid ? 'left' : 'right';
					}

					// (https://dev.ckeditor.com/ticket/9769) If viewport width is less than space width,
					// make sure space never cross the left boundary of the viewport.
					// In other words: top-left corner of the space is always visible.
					if ( spaceRect.width > viewRect.width ) {
						alignSide = 'left';
						offset = 0;
					}
					else {
						if ( alignSide == 'left' ) {
							// If the space rect fits into viewport, align it
							// to the left edge of editor:
							//
							// +------------------------ Viewport -+
							// |                                   |
							// |   +------------- Space -+         |
							// |   |                     |         |
							// |   +---------------------+         |
							// |   +------------------ Editor -+   |
							// |   |                           |   |
							//
							if ( editorRect.left > 0 )
								offset = editorRect.left;

							// If the left part of the editor is cut off by the left
							// edge of the viewport, stick the space to the viewport:
							//
							//       +------------------------ Viewport -+
							//       |                                   |
							//       +---------------- Space -+          |
							//       |                        |          |
							//       +------------------------+          |
							//  +----|------------- Editor -+            |
							//  |    |                      |            |
							//
							else
								offset = 0;
						}
						else {
							// If the space rect fits into viewport, align it
							// to the right edge of editor:
							//
							// +------------------------ Viewport -+
							// |                                   |
							// |         +------------- Space -+   |
							// |         |                     |   |
							// |         +---------------------+   |
							// |   +------------------ Editor -+   |
							// |   |                           |   |
							//
							if ( editorRect.right < viewRect.width )
								offset = viewRect.width - editorRect.right;

							// If the right part of the editor is cut off by the right
							// edge of the viewport, stick the space to the viewport:
							//
							// +------------------------ Viewport -+
							// |                                   |
							// |             +------------- Space -+
							// |             |                     |
							// |             +---------------------+
							// |                 +-----------------|- Editor -+
							// |                 |                 |          |
							//
							else
								offset = 0;
						}

						// (https://dev.ckeditor.com/ticket/9769) Finally, stick the space to the opposite side of
						// the viewport when it's cut off horizontally on the left/right
						// side like below.
						//
						// This trick reveals cut off space in some edge cases and
						// hence it improves accessibility.
						//
						// +------------------------ Viewport -+
						// |                                   |
						// |              +--------------------|-- Space -+
						// |              |                    |          |
						// |              +--------------------|----------+
						// |              +------- Editor -+   |
						// |              |                |   |
						//
						//				becomes:
						//
						// +------------------------ Viewport -+
						// |                                   |
						// |   +----------------------- Space -+
						// |   |                               |
						// |   +-------------------------------+
						// |              +------- Editor -+   |
						// |              |                |   |
						//
						if ( offset + spaceRect.width > viewRect.width ) {
							alignSide = alignSide == 'left' ? 'right' : 'left';
							offset = 0;
						}
					}

					// Pin mode is fixed, so don't include scroll-x.
					// (https://dev.ckeditor.com/ticket/9903) For mode is "top" or "bottom", add opposite scroll-x for right-aligned space.
					var scroll = mode == 'pin' ? 0 : alignSide == 'left' ? pageScrollX : -pageScrollX;

					floatSpace.setStyle( alignSide, pixelate( ( mode == 'pin' ? pinnedOffsetX : dockedOffsetX ) + offset + scroll ) );
				};
			} )();

		if ( topHtml ) {
			var floatSpaceTpl = new CKEDITOR.template(
				'<div' +
					' id="cke_{name}"' +
					' class="cke {id} cke_reset_all cke_chrome cke_editor_{name} cke_float cke_{langDir} ' + CKEDITOR.env.cssClass + '"' +
					' dir="{langDir}"' +
					' title="' + ( CKEDITOR.env.gecko ? ' ' : '' ) + '"' +
					' lang="{langCode}"' +
					' role="application"' +
					' style="{style}"' +
					( editor.title ? ' aria-labelledby="cke_{name}_arialbl"' : ' ' ) +
					'>' +
					( editor.title ? '<span id="cke_{name}_arialbl" class="cke_voice_label">{voiceLabel}</span>' : ' ' ) +
					'<div class="cke_inner">' +
						'<div id="{topId}" class="cke_top" role="presentation">{content}</div>' +
					'</div>' +
				'</div>' ),
				floatSpace = CKEDITOR.document.getBody().append( CKEDITOR.dom.element.createFromHtml( floatSpaceTpl.output( {
					content: topHtml,
					id: editor.id,
					langDir: editor.lang.dir,
					langCode: editor.langCode,
					name: editor.name,
					style: 'display:none;z-index:' + ( config.baseFloatZIndex - 1 ),
					topId: editor.ui.spaceId( 'top' ),
					voiceLabel: editor.title
				} ) ) ),

				// Use event buffers to reduce CPU load when tons of events are fired.
				changeBuffer = CKEDITOR.tools.eventsBuffer( 500, layout ),
				uiBuffer = CKEDITOR.tools.eventsBuffer( 100, layout );

			// There's no need for the floatSpace to be selectable.
			floatSpace.unselectable();

			// Prevent clicking on non-buttons area of the space from blurring editor.
			floatSpace.on( 'mousedown', function( evt ) {
				evt = evt.data;
				if ( !evt.getTarget().hasAscendant( 'a', 1 ) )
					evt.preventDefault();
			} );

			editor.on( 'focus', function( evt ) {
				layout( evt );
				editor.on( 'change', changeBuffer.input );
				win.on( 'scroll', uiBuffer.input );
				win.on( 'resize', uiBuffer.input );
			} );

			editor.on( 'blur', function() {
				floatSpace.hide();
				editor.removeListener( 'change', changeBuffer.input );
				win.removeListener( 'scroll', uiBuffer.input );
				win.removeListener( 'resize', uiBuffer.input );
			} );

			editor.on( 'destroy', function() {
				win.removeListener( 'scroll', uiBuffer.input );
				win.removeListener( 'resize', uiBuffer.input );
				floatSpace.clearCustomData();
				floatSpace.remove();
			} );

			// Handle initial focus.
			if ( editor.focusManager.hasFocus )
				floatSpace.show();

			// Register this UI space to the focus manager.
			editor.focusManager.add( floatSpace, 1 );
		}
	}
} )();

/**
 * Along with {@link #floatSpaceDockedOffsetY} it defines the
 * amount of offset (in pixels) between the float space and the editable left/right
 * boundaries when the space element is docked on either side of the editable.
 *
 *		config.floatSpaceDockedOffsetX = 10;
 *
 * @cfg {Number} [floatSpaceDockedOffsetX=0]
 * @member CKEDITOR.config
 */

/**
 * Along with {@link #floatSpaceDockedOffsetX} it defines the
 * amount of offset (in pixels) between the float space and the editable top/bottom
 * boundaries when the space element is docked on either side of the editable.
 *
 *		config.floatSpaceDockedOffsetY = 10;
 *
 * @cfg {Number} [floatSpaceDockedOffsetY=0]
 * @member CKEDITOR.config
 */

/**
 * Along with {@link #floatSpacePinnedOffsetY} it defines the
 * amount of offset (in pixels) between the float space and the viewport boundaries
 * when the space element is pinned.
 *
 *		config.floatSpacePinnedOffsetX = 20;
 *
 * @cfg {Number} [floatSpacePinnedOffsetX=0]
 * @member CKEDITOR.config
 */

/**
 * Along with {@link #floatSpacePinnedOffsetX} it defines the
 * amount of offset (in pixels) between the float space and the viewport boundaries
 * when the space element is pinned.
 *
 *		config.floatSpacePinnedOffsetY = 20;
 *
 * @cfg {Number} [floatSpacePinnedOffsetY=0]
 * @member CKEDITOR.config
 */

/**
 * Indicates that the float space should be aligned to the right side
 * of the editable area rather than to the left (if possible).
 *
 *		config.floatSpacePreferRight = true;
 *
 * @since 4.5.0
 * @cfg {Boolean} [floatSpacePreferRight=false]
 * @member CKEDITOR.config
 */

/**
 * Fired when the viewport or editor parameters change and the floating space needs to check and
 * eventually update its position and dimensions.
 *
 * @since 4.5.0
 * @event floatingSpaceLayout
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor The editor instance.
 * @param data
 * @param {Boolean} data.show True if the float space should show up as a result of this event.
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

CKEDITOR.plugins.add( 'listblock', {
	requires: 'panel',

	onLoad: function() {
		var list = CKEDITOR.addTemplate( 'panel-list', '<ul role="presentation" class="cke_panel_list">{items}</ul>' ),
			listItem = CKEDITOR.addTemplate( 'panel-list-item', '<li id="{id}" class="cke_panel_listItem" role=presentation>' +
				'<a id="{id}_option" _cke_focus=1 hidefocus=true' +
					' title="{title}"' +
					' draggable="false"' +
					' ondragstart="return false;"' + // Draggable attribute is buggy on Firefox.
					' href="javascript:void(\'{val}\')" ' +
					' {onclick}="CKEDITOR.tools.callFunction({clickFn},\'{val}\'); return false;"' + // https://dev.ckeditor.com/ticket/188
						' role="option">' +
					'{text}' +
				'</a>' +
				'</li>' ),
			listGroup = CKEDITOR.addTemplate( 'panel-list-group', '<h1 id="{id}" draggable="false" ondragstart="return false;" class="cke_panel_grouptitle" role="presentation" >{label}</h1>' ),
			reSingleQuote = /\'/g,
			escapeSingleQuotes = function( str ) {
				return str.replace( reSingleQuote, '\\\'' );
			};

		CKEDITOR.ui.panel.prototype.addListBlock = function( name, definition ) {
			return this.addBlock( name, new CKEDITOR.ui.listBlock( this.getHolderElement(), definition ) );
		};

		CKEDITOR.ui.listBlock = CKEDITOR.tools.createClass( {
			base: CKEDITOR.ui.panel.block,

			$: function( blockHolder, blockDefinition ) {
				blockDefinition = blockDefinition || {};

				var attribs = blockDefinition.attributes || ( blockDefinition.attributes = {} );
				( this.multiSelect = !!blockDefinition.multiSelect ) && ( attribs[ 'aria-multiselectable' ] = true );
				// Provide default role of 'listbox'.
				!attribs.role && ( attribs.role = 'listbox' );

				// Call the base contructor.
				this.base.apply( this, arguments );

				// Set the proper a11y attributes.
				this.element.setAttribute( 'role', attribs.role );

				var keys = this.keys;
				keys[ 40 ] = 'next'; // ARROW-DOWN
				keys[ 9 ] = 'next'; // TAB
				keys[ 38 ] = 'prev'; // ARROW-UP
				keys[ CKEDITOR.SHIFT + 9 ] = 'prev'; // SHIFT + TAB
				keys[ 32 ] = CKEDITOR.env.ie ? 'mouseup' : 'click'; // SPACE
				CKEDITOR.env.ie && ( keys[ 13 ] = 'mouseup' ); // Manage ENTER, since onclick is blocked in IE (https://dev.ckeditor.com/ticket/8041).

				this._.pendingHtml = [];
				this._.pendingList = [];
				this._.items = {};
				this._.groups = {};
			},

			_: {
				close: function() {
					if ( this._.started ) {
						var output = list.output( { items: this._.pendingList.join( '' ) } );
						this._.pendingList = [];
						this._.pendingHtml.push( output );
						delete this._.started;
					}
				},

				getClick: function() {
					if ( !this._.click ) {
						this._.click = CKEDITOR.tools.addFunction( function( value ) {
							var marked = this.toggle( value );
							if ( this.onClick )
								this.onClick( value, marked );
						}, this );
					}
					return this._.click;
				}
			},

			proto: {
				add: function( value, html, title ) {
					var id = CKEDITOR.tools.getNextId();

					if ( !this._.started ) {
						this._.started = 1;
						this._.size = this._.size || 0;
					}

					this._.items[ value ] = id;

					var data = {
						id: id,
						val: escapeSingleQuotes( CKEDITOR.tools.htmlEncodeAttr( value ) ),
						onclick: CKEDITOR.env.ie ? 'onclick="return false;" onmouseup' : 'onclick',
						clickFn: this._.getClick(),
						title: CKEDITOR.tools.htmlEncodeAttr( title || value ),
						text: html || value
					};

					this._.pendingList.push( listItem.output( data ) );
				},

				startGroup: function( title ) {
					this._.close();

					var id = CKEDITOR.tools.getNextId();

					this._.groups[ title ] = id;

					this._.pendingHtml.push( listGroup.output( { id: id, label: title } ) );
				},

				commit: function() {
					this._.close();
					this.element.appendHtml( this._.pendingHtml.join( '' ) );
					delete this._.size;

					this._.pendingHtml = [];
				},

				toggle: function( value ) {
					var isMarked = this.isMarked( value );

					if ( isMarked )
						this.unmark( value );
					else
						this.mark( value );

					return !isMarked;
				},

				hideGroup: function( groupTitle ) {
					var group = this.element.getDocument().getById( this._.groups[ groupTitle ] ),
						list = group && group.getNext();

					if ( group ) {
						group.setStyle( 'display', 'none' );

						if ( list && list.getName() == 'ul' )
							list.setStyle( 'display', 'none' );
					}
				},

				hideItem: function( value ) {
					this.element.getDocument().getById( this._.items[ value ] ).setStyle( 'display', 'none' );
				},

				showAll: function() {
					var items = this._.items,
						groups = this._.groups,
						doc = this.element.getDocument();

					for ( var value in items ) {
						doc.getById( items[ value ] ).setStyle( 'display', '' );
					}

					for ( var title in groups ) {
						var group = doc.getById( groups[ title ] ),
							list = group.getNext();

						group.setStyle( 'display', '' );

						if ( list && list.getName() == 'ul' )
							list.setStyle( 'display', '' );
					}
				},

				mark: function( value ) {
					if ( !this.multiSelect )
						this.unmarkAll();

					var itemId = this._.items[ value ],
						item = this.element.getDocument().getById( itemId );
					item.addClass( 'cke_selected' );

					this.element.getDocument().getById( itemId + '_option' ).setAttribute( 'aria-selected', true );
					this.onMark && this.onMark( item );
				},

				markFirstDisplayed: function() {
					var context = this;
					this._.markFirstDisplayed( function() {
						if ( !context.multiSelect )
							context.unmarkAll();
					} );
				},

				unmark: function( value ) {
					var doc = this.element.getDocument(),
						itemId = this._.items[ value ],
						item = doc.getById( itemId );

					item.removeClass( 'cke_selected' );
					doc.getById( itemId + '_option' ).removeAttribute( 'aria-selected' );

					this.onUnmark && this.onUnmark( item );
				},

				unmarkAll: function() {
					var items = this._.items,
						doc = this.element.getDocument();

					for ( var value in items ) {
						var itemId = items[ value ];

						doc.getById( itemId ).removeClass( 'cke_selected' );
						doc.getById( itemId + '_option' ).removeAttribute( 'aria-selected' );
					}

					this.onUnmark && this.onUnmark();
				},

				isMarked: function( value ) {
					return this.element.getDocument().getById( this._.items[ value ] ).hasClass( 'cke_selected' );
				},

				focus: function( value ) {
					this._.focusIndex = -1;

					var links = this.element.getElementsByTag( 'a' ),
						link,
						selected,
						i = -1;

					if ( value ) {
						selected = this.element.getDocument().getById( this._.items[ value ] ).getFirst();

						while ( ( link = links.getItem( ++i ) ) ) {
							if ( link.equals( selected ) ) {
								this._.focusIndex = i;
								break;
							}
						}
					}
					else {
						this.element.focus();
					}

					selected && setTimeout( function() {
						selected.focus();
					}, 0 );
				}
			}
		} );
	}
} );

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

CKEDITOR.plugins.add( 'richcombo', {
	requires: 'floatpanel,listblock,button',

	beforeInit: function( editor ) {
		editor.ui.addHandler( CKEDITOR.UI_RICHCOMBO, CKEDITOR.ui.richCombo.handler );
	}
} );

( function() {
	var template = '<span id="{id}"' +
		' class="cke_combo cke_combo__{name} {cls}"' +
		' role="presentation">' +
			'<span id="{id}_label" class="cke_combo_label">{label}</span>' +
			'<a class="cke_combo_button" title="{title}" tabindex="-1"' +
			( CKEDITOR.env.gecko && !CKEDITOR.env.hc ? '' : ' href="javascript:void(\'{titleJs}\')"' ) +
			' hidefocus="true"' +
			' role="button"' +
			' aria-labelledby="{id}_label"' +
			' aria-haspopup="listbox"';

	// Some browsers don't cancel key events in the keydown but in the
	// keypress.
	// TODO: Check if really needed.
	if ( CKEDITOR.env.gecko && CKEDITOR.env.mac )
		template += ' onkeypress="return false;"';

	// With Firefox, we need to force the button to redraw, otherwise it
	// will remain in the focus state.
	if ( CKEDITOR.env.gecko )
		template += ' onblur="this.style.cssText = this.style.cssText;"';

	template +=
		' onkeydown="return CKEDITOR.tools.callFunction({keydownFn},event,this);"' +
		' onfocus="return CKEDITOR.tools.callFunction({focusFn},event);" ' +
			( CKEDITOR.env.ie ? 'onclick="return false;" onmouseup' : 'onclick' ) + // https://dev.ckeditor.com/ticket/188
				'="CKEDITOR.tools.callFunction({clickFn},this);return false;">' +
			'<span id="{id}_text" class="cke_combo_text cke_combo_inlinelabel">{label}</span>' +
			'<span class="cke_combo_open">' +
				'<span class="cke_combo_arrow">' +
				// BLACK DOWN-POINTING TRIANGLE
	( CKEDITOR.env.hc ? '&#9660;' : CKEDITOR.env.air ? '&nbsp;' : '' ) +
				'</span>' +
			'</span>' +
		'</a>' +
		'</span>';

	var rcomboTpl = CKEDITOR.addTemplate( 'combo', template );

	/**
	 * Button UI element.
	 *
	 * @readonly
	 * @property {String} [='richcombo']
	 * @member CKEDITOR
	 */
	CKEDITOR.UI_RICHCOMBO = 'richcombo';

	/**
	 * @class
	 * @todo
	 */
	CKEDITOR.ui.richCombo = CKEDITOR.tools.createClass( {
		$: function( definition ) {
			// Copy all definition properties to this object.
			CKEDITOR.tools.extend( this, definition,
			// Set defaults.
			{
				// The combo won't participate in toolbar grouping.
				canGroup: false,
				title: definition.label,
				modes: { wysiwyg: 1 },
				editorFocus: 1
			} );

			// We don't want the panel definition in this object.
			var panelDefinition = this.panel || {};
			delete this.panel;

			this.id = CKEDITOR.tools.getNextNumber();

			this.document = ( panelDefinition.parent && panelDefinition.parent.getDocument() ) || CKEDITOR.document;

			panelDefinition.className = 'cke_combopanel';
			panelDefinition.block = {
				multiSelect: panelDefinition.multiSelect,
				attributes: panelDefinition.attributes
			};
			panelDefinition.toolbarRelated = true;

			this._ = {
				panelDefinition: panelDefinition,
				items: {},
				listeners: []
			};
		},

		proto: {
			renderHtml: function( editor ) {
				var output = [];
				this.render( editor, output );
				return output.join( '' );
			},

			/**
			 * Renders the rich combo.
			 *
			 * @param {CKEDITOR.editor} editor The editor instance which this button is
			 * to be used by.
			 * @param {Array} output The output array that the HTML relative
			 * to this button will be appended to.
			 */
			render: function( editor, output ) {
				var env = CKEDITOR.env;

				var id = 'cke_' + this.id;
				var clickFn = CKEDITOR.tools.addFunction( function( el ) {
					// Restore locked selection in Opera.
					if ( selLocked ) {
						editor.unlockSelection( 1 );
						selLocked = 0;
					}
					instance.execute( el );
				}, this );

				var combo = this;
				var instance = {
					id: id,
					combo: this,
					focus: function() {
						var element = CKEDITOR.document.getById( id ).getChild( 1 );
						element.focus();
					},
					execute: function( el ) {
						var _ = combo._;

						if ( _.state == CKEDITOR.TRISTATE_DISABLED )
							return;

						combo.createPanel( editor );

						if ( _.on ) {
							_.panel.hide();
							return;
						}

						combo.commit();
						var value = combo.getValue();
						if ( value )
							_.list.mark( value );
						else
							_.list.unmarkAll();

						_.panel.showBlock( combo.id, new CKEDITOR.dom.element( el ), 4 );
					},
					clickFn: clickFn
				};

				function updateState() {
					// Don't change state while richcombo is active (https://dev.ckeditor.com/ticket/11793).
					if ( this.getState() == CKEDITOR.TRISTATE_ON )
						return;

					var state = this.modes[ editor.mode ] ? CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED;

					if ( editor.readOnly && !this.readOnly )
						state = CKEDITOR.TRISTATE_DISABLED;

					this.setState( state );
					this.setValue( '' );

					// Let plugin to disable button.
					if ( state != CKEDITOR.TRISTATE_DISABLED && this.refresh )
						this.refresh();
				}

				// Update status when activeFilter, mode, selection or readOnly changes.
				this._.listeners.push( editor.on( 'activeFilterChange', updateState, this ) );
				this._.listeners.push( editor.on( 'mode', updateState, this ) );
				this._.listeners.push( editor.on( 'selectionChange', updateState, this ) );
				// If this combo is sensitive to readOnly state, update it accordingly.
				!this.readOnly && this._.listeners.push( editor.on( 'readOnly', updateState, this ) );

				var keyDownFn = CKEDITOR.tools.addFunction( function( ev, element ) {
					ev = new CKEDITOR.dom.event( ev );

					var keystroke = ev.getKeystroke();

					switch ( keystroke ) {
						case 13: // ENTER
						case 32: // SPACE
						case 40: // ARROW-DOWN
							// Show panel
							CKEDITOR.tools.callFunction( clickFn, element );
							break;
						default:
							// Delegate the default behavior to toolbar button key handling.
							instance.onkey( instance, keystroke );
					}

					// Avoid subsequent focus grab on editor document.
					ev.preventDefault();
				} );

				var focusFn = CKEDITOR.tools.addFunction( function() {
					instance.onfocus && instance.onfocus();
				} );

				var selLocked = 0;

				// For clean up
				instance.keyDownFn = keyDownFn;

				var params = {
					id: id,
					name: this.name || this.command,
					label: this.label,
					title: this.title,
					cls: this.className || '',
					titleJs: env.gecko && !env.hc ? '' : ( this.title || '' ).replace( "'", '' ),
					keydownFn: keyDownFn,
					focusFn: focusFn,
					clickFn: clickFn
				};

				rcomboTpl.output( params, output );

				if ( this.onRender )
					this.onRender();

				return instance;
			},

			createPanel: function( editor ) {
				if ( this._.panel )
					return;

				var panelDefinition = this._.panelDefinition,
					panelBlockDefinition = this._.panelDefinition.block,
					panelParentElement = panelDefinition.parent || CKEDITOR.document.getBody(),
					namedPanelCls = 'cke_combopanel__' + this.name,
					panel = new CKEDITOR.ui.floatPanel( editor, panelParentElement, panelDefinition ),
					list = panel.addListBlock( this.id, panelBlockDefinition ),
					me = this;

				panel.onShow = function() {
					this.element.addClass( namedPanelCls );

					me.setState( CKEDITOR.TRISTATE_ON );

					me._.on = 1;

					me.editorFocus && !editor.focusManager.hasFocus && editor.focus();

					if ( me.onOpen )
						me.onOpen();
				};

				panel.onHide = function( preventOnClose ) {
					this.element.removeClass( namedPanelCls );

					me.setState( me.modes && me.modes[ editor.mode ] ? CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED );

					me._.on = 0;

					if ( !preventOnClose && me.onClose )
						me.onClose();
				};

				panel.onEscape = function() {
					// Hide drop-down with focus returned.
					panel.hide( 1 );
				};

				list.onClick = function( value, marked ) {

					if ( me.onClick )
						me.onClick.call( me, value, marked );

					panel.hide();
				};

				this._.panel = panel;
				this._.list = list;

				panel.getBlock( this.id ).onHide = function() {
					me._.on = 0;
					me.setState( CKEDITOR.TRISTATE_OFF );
				};

				if ( this.init )
					this.init();
			},

			setValue: function( value, text ) {
				this._.value = value;

				var textElement = this.document.getById( 'cke_' + this.id + '_text' );
				if ( textElement ) {
					if ( !( value || text ) ) {
						text = this.label;
						textElement.addClass( 'cke_combo_inlinelabel' );
					} else {
						textElement.removeClass( 'cke_combo_inlinelabel' );
					}

					textElement.setText( typeof text != 'undefined' ? text : value );
				}
			},

			getValue: function() {
				return this._.value || '';
			},

			unmarkAll: function() {
				this._.list.unmarkAll();
			},

			mark: function( value ) {
				this._.list.mark( value );
			},

			hideItem: function( value ) {
				this._.list.hideItem( value );
			},

			hideGroup: function( groupTitle ) {
				this._.list.hideGroup( groupTitle );
			},

			showAll: function() {
				this._.list.showAll();
			},

			add: function( value, html, text ) {
				this._.items[ value ] = text || value;
				this._.list.add( value, html, text );
			},

			startGroup: function( title ) {
				this._.list.startGroup( title );
			},

			commit: function() {
				if ( !this._.committed ) {
					this._.list.commit();
					this._.committed = 1;
					CKEDITOR.ui.fire( 'ready', this );
				}
				this._.committed = 1;
			},

			setState: function( state ) {
				if ( this._.state == state )
					return;

				var el = this.document.getById( 'cke_' + this.id );
				el.setState( state, 'cke_combo' );

				state == CKEDITOR.TRISTATE_DISABLED ?
					el.setAttribute( 'aria-disabled', true ) :
					el.removeAttribute( 'aria-disabled' );

				this._.state = state;
			},

			getState: function() {
				return this._.state;
			},

			enable: function() {
				if ( this._.state == CKEDITOR.TRISTATE_DISABLED )
					this.setState( this._.lastState );
			},

			disable: function() {
				if ( this._.state != CKEDITOR.TRISTATE_DISABLED ) {
					this._.lastState = this._.state;
					this.setState( CKEDITOR.TRISTATE_DISABLED );
				}
			},

			/**
			 * Removes all listeners from a rich combo element.
			 *
			 * @since 4.11.0
			 */
			destroy: function() {
				CKEDITOR.tools.array.forEach( this._.listeners, function( listener ) {
					listener.removeListener();
				} );
				this._.listeners = [];
			}
		},

		/**
		 * Represents a rich combo handler object.
		 *
		 * @class CKEDITOR.ui.richCombo.handler
		 * @singleton
		 * @extends CKEDITOR.ui.handlerDefinition
		 */
		statics: {
			handler: {
				/**
				 * Transforms a rich combo definition into a {@link CKEDITOR.ui.richCombo} instance.
				 *
				 * @param {Object} definition
				 * @returns {CKEDITOR.ui.richCombo}
				 */
				create: function( definition ) {
					return new CKEDITOR.ui.richCombo( definition );
				}
			}
		}
	} );

	/**
	 * @param {String} name
	 * @param {Object} definition
	 * @member CKEDITOR.ui
	 * @todo
	 */
	CKEDITOR.ui.prototype.addRichCombo = function( name, definition ) {
		this.add( name, CKEDITOR.UI_RICHCOMBO, definition );
	};

} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

CKEDITOR.plugins.add( 'format', {
	requires: 'richcombo',
	// jscs:disable maximumLineLength
	// jscs:enable maximumLineLength
	init: function( editor ) {
		if ( editor.blockless )
			return;

		var config = editor.config,
			lang = editor.lang.format;

		// Gets the list of tags from the settings.
		var tags = config.format_tags.split( ';' );

		// Create style objects for all defined styles.
		var styles = {},
			stylesCount = 0,
			allowedContent = [];
		for ( var i = 0; i < tags.length; i++ ) {
			var tag = tags[ i ];
			var style = new CKEDITOR.style( config[ 'format_' + tag ] );
			if ( !editor.filter.customConfig || editor.filter.check( style ) ) {
				stylesCount++;
				styles[ tag ] = style;
				styles[ tag ]._.enterMode = editor.config.enterMode;
				allowedContent.push( style );
			}
		}

		// Hide entire combo when all formats are rejected.
		if ( stylesCount === 0 )
			return;

		editor.ui.addRichCombo( 'Format', {
			label: lang.label,
			title: lang.panelTitle,
			toolbar: 'styles,20',
			allowedContent: allowedContent,

			panel: {
				css: [ CKEDITOR.skin.getPath( 'editor' ) ].concat( config.contentsCss ),
				multiSelect: false,
				attributes: { 'aria-label': lang.panelTitle }
			},

			init: function() {
				this.startGroup( lang.panelTitle );

				for ( var tag in styles ) {
					var label = lang[ 'tag_' + tag ];

					// Add the tag entry to the panel list.
					this.add( tag, styles[ tag ].buildPreview( label ), label );
				}
			},

			onClick: function( value ) {
				editor.focus();
				editor.fire( 'saveSnapshot' );

				var style = styles[ value ],
					elementPath = editor.elementPath();

				// Always apply style, do not allow to toggle it by clicking on corresponding list item (#584).
				if ( !style.checkActive( elementPath, editor ) ) {
					editor.applyStyle( style );
				}

				// Save the undo snapshot after all changes are affected. (https://dev.ckeditor.com/ticket/4899)
				setTimeout( function() {
					editor.fire( 'saveSnapshot' );
				}, 0 );
			},

			onRender: function() {
				editor.on( 'selectionChange', function( ev ) {
					var currentTag = this.getValue(),
						elementPath = ev.data.path;

					this.refresh();

					for ( var tag in styles ) {
						if ( styles[ tag ].checkActive( elementPath, editor ) ) {
							if ( tag != currentTag )
								this.setValue( tag, editor.lang.format[ 'tag_' + tag ] );
							return;
						}
					}

					// If no styles match, just empty it.
					this.setValue( '' );

				}, this );
			},

			onOpen: function() {
				this.showAll();
				for ( var name in styles ) {
					var style = styles[ name ];

					// Check if that style is enabled in activeFilter.
					if ( !editor.activeFilter.check( style ) )
						this.hideItem( name );

				}
			},

			refresh: function() {
				var elementPath = editor.elementPath();

				if ( !elementPath )
						return;

				// Check if element path contains 'p' element.
				if ( !elementPath.isContextFor( 'p' ) ) {
					this.setState( CKEDITOR.TRISTATE_DISABLED );
					return;
				}

				// Check if there is any available style.
				for ( var name in styles ) {
					if ( editor.activeFilter.check( styles[ name ] ) )
						return;
				}
				this.setState( CKEDITOR.TRISTATE_DISABLED );
			}
		} );
	}
} );

/**
 * A list of semicolon-separated style names (by default: tags) representing
 * the style definition for each entry to be displayed in the Format drop-down list
 * in the toolbar. Each entry must have a corresponding configuration in a
 * setting named `'format_(tagName)'`. For example, the `'p'` entry has its
 * definition taken from [config.format_p](#!/api/CKEDITOR.config-cfg-format_p).
 *
 * Read more in the {@glink features/format documentation}
 * and see the {@glink examples/format example}.
 *
 *		config.format_tags = 'p;h2;h3;pre';
 *
 * @cfg {String} [format_tags='p;h1;h2;h3;h4;h5;h6;pre;address;div']
 * @member CKEDITOR.config
 */
CKEDITOR.config.format_tags = 'p;h1;h2;h3;h4;h5;h6;pre;address;div';

/**
 * The style definition to be used to apply the `Normal` format.
 *
 * Read more in the {@glink features/format documentation}
 * and see the {@glink examples/format example}.
 *
 *		config.format_p = { element: 'p', attributes: { 'class': 'normalPara' } };
 *
 * @cfg {Object} [format_p={ element: 'p' }]
 * @member CKEDITOR.config
 */
CKEDITOR.config.format_p = { element: 'p' };

/**
 * The style definition to be used to apply the `Normal (DIV)` format.
 *
 * Read more in the {@glink features/format documentation}
 * and see the {@glink examples/format example}.
 *
 *		config.format_div = { element: 'div', attributes: { 'class': 'normalDiv' } };
 *
 * @cfg {Object} [format_div={ element: 'div' }]
 * @member CKEDITOR.config
 */
CKEDITOR.config.format_div = { element: 'div' };

/**
 * The style definition to be used to apply the `Formatted` format.
 *
 * Read more in the {@glink features/format documentation}
 * and see the {@glink examples/format example}.
 *
 *		config.format_pre = { element: 'pre', attributes: { 'class': 'code' } };
 *
 * @cfg {Object} [format_pre={ element: 'pre' }]
 * @member CKEDITOR.config
 */
CKEDITOR.config.format_pre = { element: 'pre' };

/**
 * The style definition to be used to apply the `Address` format.
 *
 * Read more in the {@glink features/format documentation}
 * and see the {@glink examples/format example}.
 *
 *		config.format_address = { element: 'address', attributes: { 'class': 'styledAddress' } };
 *
 * @cfg {Object} [format_address={ element: 'address' }]
 * @member CKEDITOR.config
 */
CKEDITOR.config.format_address = { element: 'address' };

/**
 * The style definition to be used to apply the `Heading 1` format.
 *
 * Read more in the {@glink features/format documentation}
 * and see the {@glink examples/format example}.
 *
 *		config.format_h1 = { element: 'h1', attributes: { 'class': 'contentTitle1' } };
 *
 * @cfg {Object} [format_h1={ element: 'h1' }]
 * @member CKEDITOR.config
 */
CKEDITOR.config.format_h1 = { element: 'h1' };

/**
 * The style definition to be used to apply the `Heading 2` format.
 *
 * Read more in the {@glink features/format documentation}
 * and see the {@glink examples/format example}.
 *
 *		config.format_h2 = { element: 'h2', attributes: { 'class': 'contentTitle2' } };
 *
 * @cfg {Object} [format_h2={ element: 'h2' }]
 * @member CKEDITOR.config
 */
CKEDITOR.config.format_h2 = { element: 'h2' };

/**
 * The style definition to be used to apply the `Heading 3` format.
 *
 * Read more in the {@glink features/format documentation}
 * and see the {@glink examples/format example}.
 *
 *		config.format_h3 = { element: 'h3', attributes: { 'class': 'contentTitle3' } };
 *
 * @cfg {Object} [format_h3={ element: 'h3' }]
 * @member CKEDITOR.config
 */
CKEDITOR.config.format_h3 = { element: 'h3' };

/**
 * The style definition to be used to apply the `Heading 4` format.
 *
 * Read more in the {@glink features/format documentation}
 * and see the {@glink examples/format example}.
 *
 *		config.format_h4 = { element: 'h4', attributes: { 'class': 'contentTitle4' } };
 *
 * @cfg {Object} [format_h4={ element: 'h4' }]
 * @member CKEDITOR.config
 */
CKEDITOR.config.format_h4 = { element: 'h4' };

/**
 * The style definition to be used to apply the `Heading 5` format.
 *
 * Read more in the {@glink features/format documentation}
 * and see the {@glink examples/format example}.
 *
 *		config.format_h5 = { element: 'h5', attributes: { 'class': 'contentTitle5' } };
 *
 * @cfg {Object} [format_h5={ element: 'h5' }]
 * @member CKEDITOR.config
 */
CKEDITOR.config.format_h5 = { element: 'h5' };

/**
 * The style definition to be used to apply the `Heading 6` format.
 *
 * Read more in the {@glink features/format documentation}
 * and see the {@glink examples/format example}.
 *
 *		config.format_h6 = { element: 'h6', attributes: { 'class': 'contentTitle6' } };
 *
 * @cfg {Object} [format_h6={ element: 'h6' }]
 * @member CKEDITOR.config
 */
CKEDITOR.config.format_h6 = { element: 'h6' };

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Horizontal Rule plugin.
 */

( function() {
	var horizontalruleCmd = {
		canUndo: false, // The undo snapshot will be handled by 'insertElement'.
		exec: function( editor ) {
			var hr = editor.document.createElement( 'hr' );
			editor.insertElement( hr );
		},

		allowedContent: 'hr',
		requiredContent: 'hr'
	};

	var pluginName = 'horizontalrule';

	// Register a plugin named "horizontalrule".
	CKEDITOR.plugins.add( pluginName, {
		// jscs:disable maximumLineLength
		// jscs:enable maximumLineLength
		init: function( editor ) {
			if ( editor.blockless )
				return;

			editor.addCommand( pluginName, horizontalruleCmd );
			editor.ui.addButton && editor.ui.addButton( 'HorizontalRule', {
				label: editor.lang.horizontalrule.toolbar,
				command: pluginName,
				toolbar: 'insert,40'
			} );
		}
	} );
} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

CKEDITOR.plugins.add( 'htmlwriter', {
	init: function( editor ) {
		var writer = new CKEDITOR.htmlWriter();

		writer.forceSimpleAmpersand = editor.config.forceSimpleAmpersand;
		writer.indentationChars = editor.config.dataIndentationChars || '\t';

		// Overwrite default basicWriter initialized in hmtlDataProcessor constructor.
		editor.dataProcessor.writer = writer;
	}
} );

/**
 * The class used to write HTML data.
 *
 *		var writer = new CKEDITOR.htmlWriter();
 *		writer.openTag( 'p' );
 *		writer.attribute( 'class', 'MyClass' );
 *		writer.openTagClose( 'p' );
 *		writer.text( 'Hello' );
 *		writer.closeTag( 'p' );
 *		alert( writer.getHtml() ); // '<p class="MyClass">Hello</p>'
 *
 * @class
 * @extends CKEDITOR.htmlParser.basicWriter
 */
CKEDITOR.htmlWriter = CKEDITOR.tools.createClass( {
	base: CKEDITOR.htmlParser.basicWriter,

	/**
	 * Creates an `htmlWriter` class instance.
	 *
	 * @constructor
	 */
	$: function() {
		// Call the base contructor.
		this.base();

		/**
		 * The characters to be used for each indentation step.
		 *
		 *		// Use tab for indentation.
		 *		editorInstance.dataProcessor.writer.indentationChars = '\t';
		 */
		this.indentationChars = '\t';

		/**
		 * The characters to be used to close "self-closing" elements, like `<br>` or `<img>`.
		 *
		 *		// Use HTML4 notation for self-closing elements.
		 *		editorInstance.dataProcessor.writer.selfClosingEnd = '>';
		 */
		this.selfClosingEnd = ' />';

		/**
		 * The characters to be used for line breaks.
		 *
		 *		// Use CRLF for line breaks.
		 *		editorInstance.dataProcessor.writer.lineBreakChars = '\r\n';
		 */
		this.lineBreakChars = '\n';

		this.sortAttributes = 1;

		this._.indent = 0;
		this._.indentation = '';
		// Indicate preformatted block context status. (https://dev.ckeditor.com/ticket/5789)
		this._.inPre = 0;
		this._.rules = {};

		var dtd = CKEDITOR.dtd;

		for ( var e in CKEDITOR.tools.extend( {}, dtd.$nonBodyContent, dtd.$block, dtd.$listItem, dtd.$tableContent ) ) {
			this.setRules( e, {
				indent: !dtd[ e ][ '#' ],
				breakBeforeOpen: 1,
				breakBeforeClose: !dtd[ e ][ '#' ],
				breakAfterClose: 1,
				needsSpace: ( e in dtd.$block ) && !( e in { li: 1, dt: 1, dd: 1 } )
			} );
		}

		this.setRules( 'br', { breakAfterOpen: 1 } );

		this.setRules( 'title', {
			indent: 0,
			breakAfterOpen: 0
		} );

		this.setRules( 'style', {
			indent: 0,
			breakBeforeClose: 1
		} );

		this.setRules( 'pre', {
			breakAfterOpen: 1, // Keep line break after the opening tag
			indent: 0 // Disable indentation on <pre>.
		} );
	},

	proto: {
		/**
		 * Writes the tag opening part for an opener tag.
		 *
		 *		// Writes '<p'.
		 *		writer.openTag( 'p', { class : 'MyClass', id : 'MyId' } );
		 *
		 * @param {String} tagName The element name for this tag.
		 * @param {Object} attributes The attributes defined for this tag. The
		 * attributes could be used to inspect the tag.
		 */
		openTag: function( tagName ) {
			var rules = this._.rules[ tagName ];

			if ( this._.afterCloser && rules && rules.needsSpace && this._.needsSpace )
				this._.output.push( '\n' );

			if ( this._.indent )
				this.indentation();
			// Do not break if indenting.
			else if ( rules && rules.breakBeforeOpen ) {
				this.lineBreak();
				this.indentation();
			}

			this._.output.push( '<', tagName );

			this._.afterCloser = 0;
		},

		/**
		 * Writes the tag closing part for an opener tag.
		 *
		 *		// Writes '>'.
		 *		writer.openTagClose( 'p', false );
		 *
		 *		// Writes ' />'.
		 *		writer.openTagClose( 'br', true );
		 *
		 * @param {String} tagName The element name for this tag.
		 * @param {Boolean} isSelfClose Indicates that this is a self-closing tag,
		 * like `<br>` or `<img>`.
		 */
		openTagClose: function( tagName, isSelfClose ) {
			var rules = this._.rules[ tagName ];

			if ( isSelfClose ) {
				this._.output.push( this.selfClosingEnd );

				if ( rules && rules.breakAfterClose )
					this._.needsSpace = rules.needsSpace;
			} else {
				this._.output.push( '>' );

				if ( rules && rules.indent )
					this._.indentation += this.indentationChars;
			}

			if ( rules && rules.breakAfterOpen )
				this.lineBreak();
			tagName == 'pre' && ( this._.inPre = 1 );
		},

		/**
		 * Writes an attribute. This function should be called after opening the
		 * tag with {@link #openTagClose}.
		 *
		 *		// Writes ' class="MyClass"'.
		 *		writer.attribute( 'class', 'MyClass' );
		 *
		 * @param {String} attName The attribute name.
		 * @param {String} attValue The attribute value.
		 */
		attribute: function( attName, attValue ) {

			if ( typeof attValue == 'string' ) {
				// Browsers don't always escape special character in attribute values. (https://dev.ckeditor.com/ticket/4683, https://dev.ckeditor.com/ticket/4719).
				attValue = CKEDITOR.tools.htmlEncodeAttr( attValue );

				// Run ampersand replacement after the htmlEncodeAttr, otherwise the results are overwritten (#965).
				if ( this.forceSimpleAmpersand ) {
					attValue = attValue.replace( /&amp;/g, '&' );
				}
			}

			this._.output.push( ' ', attName, '="', attValue, '"' );
		},

		/**
		 * Writes a closer tag.
		 *
		 *		// Writes '</p>'.
		 *		writer.closeTag( 'p' );
		 *
		 * @param {String} tagName The element name for this tag.
		 */
		closeTag: function( tagName ) {
			var rules = this._.rules[ tagName ];

			if ( rules && rules.indent )
				this._.indentation = this._.indentation.substr( this.indentationChars.length );

			if ( this._.indent )
				this.indentation();
			// Do not break if indenting.
			else if ( rules && rules.breakBeforeClose ) {
				this.lineBreak();
				this.indentation();
			}

			this._.output.push( '</', tagName, '>' );
			tagName == 'pre' && ( this._.inPre = 0 );

			if ( rules && rules.breakAfterClose ) {
				this.lineBreak();
				this._.needsSpace = rules.needsSpace;
			}

			this._.afterCloser = 1;
		},

		/**
		 * Writes text.
		 *
		 *		// Writes 'Hello Word'.
		 *		writer.text( 'Hello Word' );
		 *
		 * @param {String} text The text value
		 */
		text: function( text ) {
			if ( this._.indent ) {
				this.indentation();
				!this._.inPre && ( text = CKEDITOR.tools.ltrim( text ) );
			}

			this._.output.push( text );
		},

		/**
		 * Writes a comment.
		 *
		 *		// Writes "<!-- My comment -->".
		 *		writer.comment( ' My comment ' );
		 *
		 * @param {String} comment The comment text.
		 */
		comment: function( comment ) {
			if ( this._.indent )
				this.indentation();

			this._.output.push( '<!--', comment, '-->' );
		},

		/**
		 * Writes a line break. It uses the {@link #lineBreakChars} property for it.
		 *
		 *		// Writes '\n' (e.g.).
		 *		writer.lineBreak();
		 */
		lineBreak: function() {
			if ( !this._.inPre && this._.output.length > 0 )
				this._.output.push( this.lineBreakChars );
			this._.indent = 1;
		},

		/**
		 * Writes the current indentation character. It uses the {@link #indentationChars}
		 * property, repeating it for the current indentation steps.
		 *
		 *		// Writes '\t' (e.g.).
		 *		writer.indentation();
		 */
		indentation: function() {
			if ( !this._.inPre && this._.indentation )
				this._.output.push( this._.indentation );
			this._.indent = 0;
		},

		/**
		 * Empties the current output buffer. It also brings back the default
		 * values of the writer flags.
		 *
		 *		writer.reset();
		 */
		reset: function() {
			this._.output = [];
			this._.indent = 0;
			this._.indentation = '';
			this._.afterCloser = 0;
			this._.inPre = 0;
			this._.needsSpace = 0;
		},

		/**
		 * Sets formatting rules for a given element. Possible rules are:
		 *
		 * * `indent` &ndash; indent the element content.
		 * * `breakBeforeOpen` &ndash; break line before the opener tag for this element.
		 * * `breakAfterOpen` &ndash; break line after the opener tag for this element.
		 * * `breakBeforeClose` &ndash; break line before the closer tag for this element.
		 * * `breakAfterClose` &ndash; break line after the closer tag for this element.
		 *
		 * All rules default to `false`. Each function call overrides rules that are
		 * already present, leaving the undefined ones untouched.
		 *
		 * By default, all elements available in the {@link CKEDITOR.dtd#$block},
		 * {@link CKEDITOR.dtd#$listItem}, and {@link CKEDITOR.dtd#$tableContent}
		 * lists have all the above rules set to `true`. Additionaly, the `<br>`
		 * element has the `breakAfterOpen` rule set to `true`.
		 *
		 *		// Break line before and after "img" tags.
		 *		writer.setRules( 'img', {
		 *			breakBeforeOpen: true
		 *			breakAfterOpen: true
		 *		} );
		 *
		 *		// Reset the rules for the "h1" tag.
		 *		writer.setRules( 'h1', {} );
		 *
		 * @param {String} tagName The name of the element for which the rules are set.
		 * @param {Object} rules An object containing the element rules.
		 */
		setRules: function( tagName, rules ) {
			var currentRules = this._.rules[ tagName ];

			if ( currentRules )
				CKEDITOR.tools.extend( currentRules, rules, true );
			else
				this._.rules[ tagName ] = rules;
		}
	}
} );

/**
 * Whether to force using `'&'` instead of `'&amp;'` in element attributes
 * values. It is not recommended to change this setting for compliance with the
 * W3C XHTML 1.0 standards ([C.12, XHTML 1.0](http://www.w3.org/TR/xhtml1/#C_12)).
 *
 *		// Use `'&'` instead of `'&amp;'`
 *		CKEDITOR.config.forceSimpleAmpersand = true;
 *
 * @cfg {Boolean} [forceSimpleAmpersand=false]
 * @member CKEDITOR.config
 */

/**
 * The characters to be used for indenting HTML output produced by the editor.
 * Using characters different from `' '` (space) and `'\t'` (tab) is not recommended
 * as it will mess the code.
 *
 *		// No indentation.
 *		CKEDITOR.config.dataIndentationChars = '';
 *
 *		// Use two spaces for indentation.
 *		CKEDITOR.config.dataIndentationChars = '  ';
 *
 * @cfg {String} [dataIndentationChars='\t']
 * @member CKEDITOR.config
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview The Image plugin.
 */

( function() {

	CKEDITOR.plugins.add( 'image', {
		requires: 'dialog',
		// jscs:disable maximumLineLength
		// jscs:enable maximumLineLength
		init: function( editor ) {
			var pluginName = 'image';

			// Abort when Easyimage or Image2 are to be loaded since this plugins
			// share the same functionality (#1791).
			if ( editor.plugins.detectConflict( pluginName, [ 'easyimage', 'image2' ] ) ) {
				return;
			}

			// Register the dialog.
			CKEDITOR.dialog.add( pluginName, this.path + 'dialogs/image.js' );

			var allowed = 'img[alt,!src]{border-style,border-width,float,height,margin,margin-bottom,margin-left,margin-right,margin-top,width}',
				required = 'img[alt,src]';

			if ( CKEDITOR.dialog.isTabEnabled( editor, pluginName, 'advanced' ) )
				allowed = 'img[alt,dir,id,lang,longdesc,!src,title]{*}(*)';

			// Register the command.
			editor.addCommand( pluginName, new CKEDITOR.dialogCommand( pluginName, {
				allowedContent: allowed,
				requiredContent: required,
				contentTransformations: [
					[ 'img{width}: sizeToStyle', 'img[width]: sizeToAttribute' ],
					[ 'img{float}: alignmentToStyle', 'img[align]: alignmentToAttribute' ]
				]
			} ) );

			// Register the toolbar button.
			editor.ui.addButton && editor.ui.addButton( 'Image', {
				label: editor.lang.common.image,
				command: pluginName,
				toolbar: 'insert,10'
			} );

			editor.on( 'doubleclick', function( evt ) {
				var element = evt.data.element;

				if ( element.is( 'img' ) && !element.data( 'cke-realelement' ) && !element.isReadOnly() )
					evt.data.dialog = 'image';
			} );

			// If the "menu" plugin is loaded, register the menu items.
			if ( editor.addMenuItems ) {
				editor.addMenuItems( {
					image: {
						label: editor.lang.image.menu,
						command: 'image',
						group: 'image'
					}
				} );
			}

			// If the "contextmenu" plugin is loaded, register the listeners.
			if ( editor.contextMenu ) {
				editor.contextMenu.addListener( function( element ) {
					if ( getSelectedImage( editor, element ) )
						return { image: CKEDITOR.TRISTATE_OFF };
				} );
			}
		},
		afterInit: function( editor ) {
			// Abort when Image2 is to be loaded since both plugins
			// share the same button, command, etc. names (https://dev.ckeditor.com/ticket/11222).
			if ( editor.plugins.image2 )
				return;

			// Customize the behavior of the alignment commands. (https://dev.ckeditor.com/ticket/7430)
			setupAlignCommand( 'left' );
			setupAlignCommand( 'right' );
			setupAlignCommand( 'center' );
			setupAlignCommand( 'block' );

			function setupAlignCommand( value ) {
				var command = editor.getCommand( 'justify' + value );
				if ( command ) {
					if ( value == 'left' || value == 'right' ) {
						command.on( 'exec', function( evt ) {
							var img = getSelectedImage( editor ),
								align;
							if ( img ) {
								align = getImageAlignment( img );
								if ( align == value ) {
									img.removeStyle( 'float' );

									// Remove "align" attribute when necessary.
									if ( value == getImageAlignment( img ) )
										img.removeAttribute( 'align' );
								} else {
									img.setStyle( 'float', value );
								}

								evt.cancel();
							}
						} );
					}

					command.on( 'refresh', function( evt ) {
						var img = getSelectedImage( editor ),
							align;
						if ( img ) {
							align = getImageAlignment( img );

							this.setState(
							( align == value ) ? CKEDITOR.TRISTATE_ON : ( value == 'right' || value == 'left' ) ? CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED );

							evt.cancel();
						}
					} );
				}
			}
		}
	} );

	function getSelectedImage( editor, element ) {
		if ( !element ) {
			var sel = editor.getSelection();
			element = sel.getSelectedElement();
		}

		if ( element && element.is( 'img' ) && !element.data( 'cke-realelement' ) && !element.isReadOnly() )
			return element;
	}

	function getImageAlignment( element ) {
		var align = element.getStyle( 'float' );

		if ( align == 'inherit' || align == 'none' )
			align = 0;

		if ( !align )
			align = element.getAttribute( 'align' );

		return align;
	}

} )();

/**
 * Determines whether dimension inputs should be automatically filled when the image URL changes in the Image plugin dialog window.
 *
 *		config.image_prefillDimensions = false;
 *
 * @since 4.5.0
 * @cfg {Boolean} [image_prefillDimensions=true]
 * @member CKEDITOR.config
 */

/**
 * Whether to remove links when emptying the link URL field in the Image dialog window.
 *
 *		config.image_removeLinkByEmptyURL = false;
 *
 * @cfg {Boolean} [image_removeLinkByEmptyURL=true]
 * @member CKEDITOR.config
 */
CKEDITOR.config.image_removeLinkByEmptyURL = true;

/**
 * Padding text to set off the image in the preview area.
 *
 *		config.image_previewText = CKEDITOR.tools.repeat( '___ ', 100 );
 *
 * @cfg {String} [image_previewText='Lorem ipsum dolor...' (placeholder text)]
 * @member CKEDITOR.config
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Increase and Decrease Indent commands.
 */

( function() {
	'use strict';

	var TRISTATE_DISABLED = CKEDITOR.TRISTATE_DISABLED,
		TRISTATE_OFF = CKEDITOR.TRISTATE_OFF;

	CKEDITOR.plugins.add( 'indent', {
		// jscs:disable maximumLineLength
		// jscs:enable maximumLineLength

		init: function( editor ) {
			var genericDefinition = CKEDITOR.plugins.indent.genericDefinition;

			// Register generic commands.
			setupGenericListeners( editor, editor.addCommand( 'indent', new genericDefinition( true ) ) );
			setupGenericListeners( editor, editor.addCommand( 'outdent', new genericDefinition() ) );

			// Create and register toolbar button if possible.
			if ( editor.ui.addButton ) {
				editor.ui.addButton( 'Indent', {
					label: editor.lang.indent.indent,
					command: 'indent',
					directional: true,
					toolbar: 'indent,20'
				} );

				editor.ui.addButton( 'Outdent', {
					label: editor.lang.indent.outdent,
					command: 'outdent',
					directional: true,
					toolbar: 'indent,10'
				} );
			}

			// Register dirChanged listener.
			editor.on( 'dirChanged', function( evt ) {
				var range = editor.createRange(),
					dataNode = evt.data.node;

				range.setStartBefore( dataNode );
				range.setEndAfter( dataNode );

				var walker = new CKEDITOR.dom.walker( range ),
					node;

				while ( ( node = walker.next() ) ) {
					if ( node.type == CKEDITOR.NODE_ELEMENT ) {
						// A child with the defined dir is to be ignored.
						if ( !node.equals( dataNode ) && node.getDirection() ) {
							range.setStartAfter( node );
							walker = new CKEDITOR.dom.walker( range );
							continue;
						}

						// Switch alignment classes.
						var classes = editor.config.indentClasses;
						if ( classes ) {
							var suffix = ( evt.data.dir == 'ltr' ) ? [ '_rtl', '' ] : [ '', '_rtl' ];
							for ( var i = 0; i < classes.length; i++ ) {
								if ( node.hasClass( classes[ i ] + suffix[ 0 ] ) ) {
									node.removeClass( classes[ i ] + suffix[ 0 ] );
									node.addClass( classes[ i ] + suffix[ 1 ] );
								}
							}
						}

						// Switch the margins.
						var marginLeft = node.getStyle( 'margin-right' ),
							marginRight = node.getStyle( 'margin-left' );

						marginLeft ? node.setStyle( 'margin-left', marginLeft ) : node.removeStyle( 'margin-left' );
						marginRight ? node.setStyle( 'margin-right', marginRight ) : node.removeStyle( 'margin-right' );
					}
				}
			} );
		}
	} );

	/**
	 * Global command class definitions and global helpers.
	 *
	 * @class
	 * @singleton
	 */
	CKEDITOR.plugins.indent = {
		/**
		 * A base class for a generic command definition, responsible mainly for creating
		 * Increase Indent and Decrease Indent toolbar buttons as well as for refreshing
		 * UI states.
		 *
		 * Commands of this class do not perform any indentation by themselves. They
		 * delegate this job to content-specific indentation commands (i.e. indentlist).
		 *
		 * @class CKEDITOR.plugins.indent.genericDefinition
		 * @extends CKEDITOR.commandDefinition
		 * @param {CKEDITOR.editor} editor The editor instance this command will be
		 * applied to.
		 * @param {String} name The name of the command.
		 * @param {Boolean} [isIndent] Defines the command as indenting or outdenting.
		 */
		genericDefinition: function( isIndent ) {
			/**
			 * Determines whether the command belongs to the indentation family.
			 * Otherwise it is assumed to be an outdenting command.
			 *
			 * @readonly
			 * @property {Boolean} [=false]
			 */
			this.isIndent = !!isIndent;

			// Mimic naive startDisabled behavior for outdent.
			this.startDisabled = !this.isIndent;
		},

		/**
		 * A base class for specific indentation command definitions responsible for
		 * handling a pre-defined set of elements i.e. indentlist for lists or
		 * indentblock for text block elements.
		 *
		 * Commands of this class perform indentation operations and modify the DOM structure.
		 * They listen for events fired by {@link CKEDITOR.plugins.indent.genericDefinition}
		 * and execute defined actions.
		 *
		 * **NOTE**: This is not an {@link CKEDITOR.command editor command}.
		 * Context-specific commands are internal, for indentation system only.
		 *
		 * @class CKEDITOR.plugins.indent.specificDefinition
		 * @param {CKEDITOR.editor} editor The editor instance this command will be
		 * applied to.
		 * @param {String} name The name of the command.
		 * @param {Boolean} [isIndent] Defines the command as indenting or outdenting.
		 */
		specificDefinition: function( editor, name, isIndent ) {
			this.name = name;
			this.editor = editor;

			/**
			 * An object of jobs handled by the command. Each job consists
			 * of two functions: `refresh` and `exec` as well as the execution priority.
			 *
			 *	* The `refresh` function determines whether a job is doable for
			 *	  a particular context. These functions are executed in the
			 *	  order of priorities, one by one, for all plugins that registered
			 *	  jobs. As jobs are related to generic commands, refreshing
			 *	  occurs when the global command is firing the `refresh` event.
			 *
			 *	  **Note**: This function must return either {@link CKEDITOR#TRISTATE_DISABLED}
			 *	  or {@link CKEDITOR#TRISTATE_OFF}.
			 *
			 *	* The `exec` function modifies the DOM if possible. Just like
			 *	  `refresh`, `exec` functions are executed in the order of priorities
			 *	  while the generic command is executed. This function is not executed
			 *	  if `refresh` for this job returned {@link CKEDITOR#TRISTATE_DISABLED}.
			 *
			 *	  **Note**: This function must return a Boolean value, indicating whether it
			 *	  was successful. If a job was successful, then no other jobs are being executed.
			 *
			 * Sample definition:
			 *
			 *		command.jobs = {
			 *			// Priority = 20.
			 *			'20': {
			 *				refresh( editor, path ) {
			 *					if ( condition )
			 *						return CKEDITOR.TRISTATE_OFF;
			 *					else
			 *						return CKEDITOR.TRISTATE_DISABLED;
			 *				},
			 *				exec( editor ) {
			 *					// DOM modified! This was OK.
			 *					return true;
			 *				}
			 *			},
			 *			// Priority = 60. This job is done later.
			 *			'60': {
			 *				// Another job.
			 *			}
			 *		};
			 *
			 * For additional information, please check comments for
			 * the `setupGenericListeners` function.
			 *
			 * @readonly
			 * @property {Object} [={}]
			 */
			this.jobs = {};

			/**
			 * Determines whether the editor that the command belongs to has
			 * {@link CKEDITOR.config#enterMode config.enterMode} set to {@link CKEDITOR#ENTER_BR}.
			 *
			 * @readonly
			 * @see CKEDITOR.config#enterMode
			 * @property {Boolean} [=false]
			 */
			this.enterBr = editor.config.enterMode == CKEDITOR.ENTER_BR;

			/**
			 * Determines whether the command belongs to the indentation family.
			 * Otherwise it is assumed to be an outdenting command.
			 *
			 * @readonly
			 * @property {Boolean} [=false]
			 */
			this.isIndent = !!isIndent;

			/**
			 * The name of the global command related to this one.
			 *
			 * @readonly
			 */
			this.relatedGlobal = isIndent ? 'indent' : 'outdent';

			/**
			 * A keystroke associated with this command (*Tab* or *Shift+Tab*).
			 *
			 * @readonly
			 */
			this.indentKey = isIndent ? 9 : CKEDITOR.SHIFT + 9;

			/**
			 * Stores created markers for the command so they can eventually be
			 * purged after the `exec` function is run.
			 */
			this.database = {};
		},

		/**
		 * Registers content-specific commands as a part of the indentation system
		 * directed by generic commands. Once a command is registered,
		 * it listens for events of a related generic command.
		 *
		 *		CKEDITOR.plugins.indent.registerCommands( editor, {
		 *			'indentlist': new indentListCommand( editor, 'indentlist' ),
		 *			'outdentlist': new indentListCommand( editor, 'outdentlist' )
		 *		} );
		 *
		 * Content-specific commands listen for the generic command's `exec` and
		 * try to execute their own jobs, one after another. If some execution is
		 * successful, `evt.data.done` is set so no more jobs (commands) are involved.
		 *
		 * Content-specific commands also listen for the generic command's `refresh`
		 * and fill the `evt.data.states` object with states of jobs. A generic command
		 * uses this data to determine its own state and to update the UI.
		 *
		 * @member CKEDITOR.plugins.indent
		 * @param {CKEDITOR.editor} editor The editor instance this command is
		 * applied to.
		 * @param {Object} commands An object of {@link CKEDITOR.command}.
		 */
		registerCommands: function( editor, commands ) {
			editor.on( 'pluginsLoaded', function() {
				for ( var name in commands ) {
					( function( editor, command ) {
						var relatedGlobal = editor.getCommand( command.relatedGlobal );

						for ( var priority in command.jobs ) {
							// Observe generic exec event and execute command when necessary.
							// If the command was successfully handled by the command and
							// DOM has been modified, stop event propagation so no other plugin
							// will bother. Job is done.
							relatedGlobal.on( 'exec', function( evt ) {
								if ( evt.data.done )
									return;

								// Make sure that anything this command will do is invisible
								// for undoManager. What undoManager only can see and
								// remember is the execution of the global command (relatedGlobal).
								editor.fire( 'lockSnapshot' );

								if ( command.execJob( editor, priority ) )
									evt.data.done = true;

								editor.fire( 'unlockSnapshot' );

								// Clean up the markers.
								CKEDITOR.dom.element.clearAllMarkers( command.database );
							}, this, null, priority );

							// Observe generic refresh event and force command refresh.
							// Once refreshed, save command state in event data
							// so generic command plugin can update its own state and UI.
							relatedGlobal.on( 'refresh', function( evt ) {
								if ( !evt.data.states )
									evt.data.states = {};

								evt.data.states[ command.name + '@' + priority ] =
									command.refreshJob( editor, priority, evt.data.path );
							}, this, null, priority );
						}

						// Since specific indent commands have no UI elements,
						// they need to be manually registered as a editor feature.
						editor.addFeature( command );
					} )( this, commands[ name ] );
				}
			} );
		}
	};

	CKEDITOR.plugins.indent.genericDefinition.prototype = {
		context: 'p',

		exec: function() {}
	};

	CKEDITOR.plugins.indent.specificDefinition.prototype = {
		/**
		 * Executes the content-specific procedure if the context is correct.
		 * It calls the `exec` function of a job of the given `priority`
		 * that modifies the DOM.
		 *
		 * @param {CKEDITOR.editor} editor The editor instance this command
		 * will be applied to.
		 * @param {Number} priority The priority of the job to be executed.
		 * @returns {Boolean} Indicates whether the job was successful.
		 */
		execJob: function( editor, priority ) {
			var job = this.jobs[ priority ];

			if ( job.state != TRISTATE_DISABLED )
				return job.exec.call( this, editor );
		},

		/**
		 * Calls the `refresh` function of a job of the given `priority`.
		 * The function returns the state of the job which can be either
		 * {@link CKEDITOR#TRISTATE_DISABLED} or {@link CKEDITOR#TRISTATE_OFF}.
		 *
		 * @param {CKEDITOR.editor} editor The editor instance this command
		 * will be applied to.
		 * @param {Number} priority The priority of the job to be executed.
		 * @returns {Number} The state of the job.
		 */
		refreshJob: function( editor, priority, path ) {
			var job = this.jobs[ priority ];

			if ( !editor.activeFilter.checkFeature( this ) )
				job.state = TRISTATE_DISABLED;
			else
				job.state = job.refresh.call( this, editor, path );

			return job.state;
		},

		/**
		 * Checks if the element path contains the element handled
		 * by this indentation command.
		 *
		 * @param {CKEDITOR.dom.elementPath} node A path to be checked.
		 * @returns {CKEDITOR.dom.element}
		 */
		getContext: function( path ) {
			return path.contains( this.context );
		}
	};

	/**
	 * Attaches event listeners for this generic command. Since the indentation
	 * system is event-oriented, generic commands communicate with
	 * content-specific commands using the `exec` and `refresh` events.
	 *
	 * Listener priorities are crucial. Different indentation phases
	 * are executed with different priorities.
	 *
	 * For the `exec` event:
	 *
	 *	* 0: Selection and bookmarks are saved by the generic command.
	 *	* 1-99: Content-specific commands try to indent the code by executing
	 *	  their own jobs ({@link CKEDITOR.plugins.indent.specificDefinition#jobs}).
	 *	* 100: Bookmarks are re-selected by the generic command.
	 *
	 * The visual interpretation looks as follows:
	 *
	 *		  +------------------+
	 *		  | Exec event fired |
	 *		  +------ + ---------+
	 *		          |
	 *		        0 -<----------+ Selection and bookmarks saved.
	 *		          |
	 *		          |
	 *		       25 -<---+ Exec 1st job of plugin#1 (return false, continuing...).
	 *		          |
	 *		          |
	 *		       50 -<---+ Exec 1st job of plugin#2 (return false, continuing...).
	 *		          |
	 *		          |
	 *		       75 -<---+ Exec 2nd job of plugin#1 (only if plugin#2 failed).
	 *		          |
	 *		          |
	 *		      100 -<-----------+ Re-select bookmarks, clean-up.
	 *		          |
	 *		+-------- v ----------+
	 *		| Exec event finished |
	 *		+---------------------+
	 *
	 * For the `refresh` event:
	 *
	 *	* <100: Content-specific commands refresh their job states according
	 *	  to the given path. Jobs save their states in the `evt.data.states` object
	 *	  passed along with the event. This can be either {@link CKEDITOR#TRISTATE_DISABLED}
	 *	  or {@link CKEDITOR#TRISTATE_OFF}.
	 *	* 100: Command state is determined according to what states
	 *	  have been returned by content-specific jobs (`evt.data.states`).
	 *	  UI elements are updated at this stage.
	 *
	 *	  **Note**: If there is at least one job with the {@link CKEDITOR#TRISTATE_OFF} state,
	 *	  then the generic command state is also {@link CKEDITOR#TRISTATE_OFF}. Otherwise,
	 *	  the command state is {@link CKEDITOR#TRISTATE_DISABLED}.
	 *
	 * @param {CKEDITOR.command} command The command to be set up.
	 * @private
	 */
	function setupGenericListeners( editor, command ) {
		var selection, bookmarks;

		// Set the command state according to content-specific
		// command states.
		command.on( 'refresh', function( evt ) {
			// If no state comes with event data, disable command.
			var states = [ TRISTATE_DISABLED ];

			for ( var s in evt.data.states )
				states.push( evt.data.states[ s ] );

			this.setState( CKEDITOR.tools.search( states, TRISTATE_OFF ) ? TRISTATE_OFF : TRISTATE_DISABLED );
		}, command, null, 100 );

		// Initialization. Save bookmarks and mark event as not handled
		// by any plugin (command) yet.
		command.on( 'exec', function( evt ) {
			selection = editor.getSelection();
			bookmarks = selection.createBookmarks( 1 );

			// Mark execution as not handled yet.
			if ( !evt.data )
				evt.data = {};

			evt.data.done = false;
		}, command, null, 0 );

		// Housekeeping. Make sure selectionChange will be called.
		// Also re-select previously saved bookmarks.
		command.on( 'exec', function() {
			editor.forceNextSelectionCheck();
			selection.selectBookmarks( bookmarks );
		}, command, null, 100 );
	}
} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Handles the indentation of lists.
 */

( function() {
	'use strict';

	var isNotWhitespaces = CKEDITOR.dom.walker.whitespaces( true ),
		isNotBookmark = CKEDITOR.dom.walker.bookmark( false, true ),
		TRISTATE_DISABLED = CKEDITOR.TRISTATE_DISABLED,
		TRISTATE_OFF = CKEDITOR.TRISTATE_OFF;

	CKEDITOR.plugins.add( 'indentlist', {
		requires: 'indent',
		init: function( editor ) {
			var globalHelpers = CKEDITOR.plugins.indent;

			// Register commands.
			globalHelpers.registerCommands( editor, {
				indentlist: new commandDefinition( editor, 'indentlist', true ),
				outdentlist: new commandDefinition( editor, 'outdentlist' )
			} );

			function commandDefinition( editor ) {
				globalHelpers.specificDefinition.apply( this, arguments );

				// Require ul OR ol list.
				this.requiredContent = [ 'ul', 'ol' ];

				// Indent and outdent lists with TAB/SHIFT+TAB key. Indenting can
				// be done for any list item that isn't the first child of the parent.
				editor.on( 'key', function( evt ) {
					var path = editor.elementPath();

					if ( editor.mode != 'wysiwyg' )
						return;

					if ( evt.data.keyCode == this.indentKey ) {
						// Prevent of getting context of empty path (#424)(https://dev.ckeditor.com/ticket/17028).
						if ( !path ) {
							return;
						}

						var list = this.getContext( path );

						if ( list ) {
							// Don't indent if in first list item of the parent.
							// Outdent, however, can always be done to collapse
							// the list into a paragraph (div).
							if ( this.isIndent && CKEDITOR.plugins.indentList.firstItemInPath( this.context, path, list ) )
								return;

							// Exec related global indentation command. Global
							// commands take care of bookmarks and selection,
							// so it's much easier to use them instead of
							// content-specific commands.
							editor.execCommand( this.relatedGlobal );

							// Cancel the key event so editor doesn't lose focus.
							evt.cancel();
						}
					}
				}, this );

				// There are two different jobs for this plugin:
				//
				//	* Indent job (priority=10), before indentblock.
				//
				//	  This job is before indentblock because, if this plugin is
				//	  loaded it has higher priority over indentblock. It means that,
				//	  if possible, nesting is performed, and then block manipulation,
				//	  if necessary.
				//
				//	* Outdent job (priority=30), after outdentblock.
				//
				//	  This job got to be after outdentblock because in some cases
				//	  (margin, config#indentClass on list) outdent must be done on
				//	  block-level.

				this.jobs[ this.isIndent ? 10 : 30 ] = {
					refresh: this.isIndent ?
						function( editor, path ) {
							var list = this.getContext( path ),
								inFirstListItem = CKEDITOR.plugins.indentList.firstItemInPath( this.context, path, list );

							if ( !list || !this.isIndent || inFirstListItem )
								return TRISTATE_DISABLED;

							return TRISTATE_OFF;
						} : function( editor, path ) {
							var list = this.getContext( path );

							if ( !list || this.isIndent )
								return TRISTATE_DISABLED;

							return TRISTATE_OFF;
						},

					exec: CKEDITOR.tools.bind( indentList, this )
				};
			}

			CKEDITOR.tools.extend( commandDefinition.prototype, globalHelpers.specificDefinition.prototype, {
				// Elements that, if in an elementpath, will be handled by this
				// command. They restrict the scope of the plugin.
				context: { ol: 1, ul: 1 }
			} );
		}
	} );

	function indentList( editor ) {
		var that = this,
			database = this.database,
			context = this.context,
			range;

		function indent( listNode ) {
			// Our starting and ending points of the range might be inside some blocks under a list item...
			// So before playing with the iterator, we need to expand the block to include the list items.
			var startContainer = range.startContainer,
				endContainer = range.endContainer;
			while ( startContainer && !startContainer.getParent().equals( listNode ) )
				startContainer = startContainer.getParent();
			while ( endContainer && !endContainer.getParent().equals( listNode ) )
				endContainer = endContainer.getParent();

			if ( !startContainer || !endContainer )
				return false;

			// Now we can iterate over the individual items on the same tree depth.
			var block = startContainer,
				itemsToMove = [],
				stopFlag = false;

			while ( !stopFlag ) {
				if ( block.equals( endContainer ) )
					stopFlag = true;

				itemsToMove.push( block );
				block = block.getNext();
			}

			if ( itemsToMove.length < 1 )
				return false;

			// Do indent or outdent operations on the array model of the list, not the
			// list's DOM tree itself. The array model demands that it knows as much as
			// possible about the surrounding lists, we need to feed it the further
			// ancestor node that is still a list.
			var listParents = listNode.getParents( true );
			for ( var i = 0; i < listParents.length; i++ ) {
				if ( listParents[ i ].getName && context[ listParents[ i ].getName() ] ) {
					listNode = listParents[ i ];
					break;
				}
			}

			var indentOffset = that.isIndent ? 1 : -1,
				startItem = itemsToMove[ 0 ],
				lastItem = itemsToMove[ itemsToMove.length - 1 ],

				// Convert the list DOM tree into a one dimensional array.
				listArray = CKEDITOR.plugins.list.listToArray( listNode, database ),

				// Apply indenting or outdenting on the array.
				baseIndent = listArray[ lastItem.getCustomData( 'listarray_index' ) ].indent;

			for ( i = startItem.getCustomData( 'listarray_index' ); i <= lastItem.getCustomData( 'listarray_index' ); i++ ) {
				listArray[ i ].indent += indentOffset;
				// Make sure the newly created sublist get a brand-new element of the same type. (https://dev.ckeditor.com/ticket/5372)
				if ( indentOffset > 0 ) {
					var listRoot = listArray[ i ].parent;

					// Find previous list item which has the same indention offset as the new indention offset
					// of current item to copy its root tag (so the proper list-style-type is used) (#842).
					for ( var j = i - 1; j >= 0; j-- ) {
						if ( listArray[ j ].indent === indentOffset ) {
							listRoot = listArray[ j ].parent;
							break;
						}
					}

					listArray[ i ].parent = new CKEDITOR.dom.element( listRoot.getName(), listRoot.getDocument() );
				}
			}

			for ( i = lastItem.getCustomData( 'listarray_index' ) + 1; i < listArray.length && listArray[ i ].indent > baseIndent; i++ )
				listArray[ i ].indent += indentOffset;

			// Convert the array back to a DOM forest (yes we might have a few subtrees now).
			// And replace the old list with the new forest.
			var newList = CKEDITOR.plugins.list.arrayToList( listArray, database, null, editor.config.enterMode, listNode.getDirection() );

			// Avoid nested <li> after outdent even they're visually same,
			// recording them for later refactoring.(https://dev.ckeditor.com/ticket/3982)
			if ( !that.isIndent ) {
				var parentLiElement;
				if ( ( parentLiElement = listNode.getParent() ) && parentLiElement.is( 'li' ) ) {
					var children = newList.listNode.getChildren(),
						pendingLis = [],
						count = children.count(),
						child;

					for ( i = count - 1; i >= 0; i-- ) {
						if ( ( child = children.getItem( i ) ) && child.is && child.is( 'li' ) )
							pendingLis.push( child );
					}
				}
			}

			if ( newList )
				newList.listNode.replace( listNode );

			// Move the nested <li> to be appeared after the parent.
			if ( pendingLis && pendingLis.length ) {
				for ( i = 0; i < pendingLis.length; i++ ) {
					var li = pendingLis[ i ],
						followingList = li;

					// Nest preceding <ul>/<ol> inside current <li> if any.
					while ( ( followingList = followingList.getNext() ) && followingList.is && followingList.getName() in context ) {
						// IE requires a filler NBSP for nested list inside empty list item,
						// otherwise the list item will be inaccessiable. (https://dev.ckeditor.com/ticket/4476)
						if ( CKEDITOR.env.needsNbspFiller && !li.getFirst( neitherWhitespacesNorBookmark ) )
							li.append( range.document.createText( '\u00a0' ) );

						li.append( followingList );
					}

					li.insertAfter( parentLiElement );
				}
			}

			if ( newList )
				editor.fire( 'contentDomInvalidated' );

			return true;
		}

		var selection = editor.getSelection(),
			ranges = selection && selection.getRanges(),
			iterator = ranges.createIterator();

		while ( ( range = iterator.getNextRange() ) ) {
			var nearestListBlock = range.getCommonAncestor();

			while ( nearestListBlock && !( nearestListBlock.type == CKEDITOR.NODE_ELEMENT && context[ nearestListBlock.getName() ] ) ) {
				// Avoid having plugin propagate to parent of editor in inline mode by canceling the indentation. (https://dev.ckeditor.com/ticket/12796)
				if ( editor.editable().equals( nearestListBlock ) ) {
					nearestListBlock = false;
					break;
				}
				nearestListBlock = nearestListBlock.getParent();
			}

			// Avoid having selection boundaries out of the list.
			// <ul><li>[...</li></ul><p>...]</p> => <ul><li>[...]</li></ul><p>...</p>
			if ( !nearestListBlock ) {
				if ( ( nearestListBlock = range.startPath().contains( context ) ) )
					range.setEndAt( nearestListBlock, CKEDITOR.POSITION_BEFORE_END );
			}

			// Avoid having selection enclose the entire list. (https://dev.ckeditor.com/ticket/6138)
			// [<ul><li>...</li></ul>] =><ul><li>[...]</li></ul>
			if ( !nearestListBlock ) {
				var selectedNode = range.getEnclosedNode();
				if ( selectedNode && selectedNode.type == CKEDITOR.NODE_ELEMENT && selectedNode.getName() in context ) {
					range.setStartAt( selectedNode, CKEDITOR.POSITION_AFTER_START );
					range.setEndAt( selectedNode, CKEDITOR.POSITION_BEFORE_END );
					nearestListBlock = selectedNode;
				}
			}

			// Avoid selection anchors under list root.
			// <ul>[<li>...</li>]</ul> =>	<ul><li>[...]</li></ul>
			if ( nearestListBlock && range.startContainer.type == CKEDITOR.NODE_ELEMENT && range.startContainer.getName() in context ) {
				var walker = new CKEDITOR.dom.walker( range );
				walker.evaluator = listItem;
				range.startContainer = walker.next();
			}

			if ( nearestListBlock && range.endContainer.type == CKEDITOR.NODE_ELEMENT && range.endContainer.getName() in context ) {
				walker = new CKEDITOR.dom.walker( range );
				walker.evaluator = listItem;
				range.endContainer = walker.previous();
			}

			if ( nearestListBlock )
				return indent( nearestListBlock );
		}
		return 0;
	}

	// Determines whether a node is a list <li> element.
	function listItem( node ) {
		return node.type == CKEDITOR.NODE_ELEMENT && node.is( 'li' );
	}

	function neitherWhitespacesNorBookmark( node ) {
		return isNotWhitespaces( node ) && isNotBookmark( node );
	}

	/**
	 * Global namespace for methods exposed by the Indent List plugin.
	 *
	 * @singleton
	 * @class
	 */
	CKEDITOR.plugins.indentList = {};

	/**
	 * Checks whether the first child of the list is in the path.
	 * The list can be extracted from the path or given explicitly
	 * e.g. for better performance if cached.
	 *
	 * @since 4.4.6
	 * @param {Object} query See the {@link CKEDITOR.dom.elementPath#contains} method arguments.
	 * @param {CKEDITOR.dom.elementPath} path
	 * @param {CKEDITOR.dom.element} [list]
	 * @returns {Boolean}
	 * @member CKEDITOR.plugins.indentList
	 */
	CKEDITOR.plugins.indentList.firstItemInPath = function( query, path, list ) {
		var firstListItemInPath = path.contains( listItem );
		if ( !list )
			list = path.contains( query );

		return list && firstListItemInPath && firstListItemInPath.equals( list.getFirst( listItem ) );
	};
} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Handles the indentation of block elements.
 */

( function() {
	'use strict';

	var $listItem = CKEDITOR.dtd.$listItem,
		$list = CKEDITOR.dtd.$list,
		TRISTATE_DISABLED = CKEDITOR.TRISTATE_DISABLED,
		TRISTATE_OFF = CKEDITOR.TRISTATE_OFF;

	CKEDITOR.plugins.add( 'indentblock', {
		requires: 'indent',
		init: function( editor ) {
			var globalHelpers = CKEDITOR.plugins.indent,
				classes = editor.config.indentClasses;

			// Register commands.
			globalHelpers.registerCommands( editor, {
				indentblock: new commandDefinition( editor, 'indentblock', true ),
				outdentblock: new commandDefinition( editor, 'outdentblock' )
			} );

			function commandDefinition() {
				globalHelpers.specificDefinition.apply( this, arguments );

				this.allowedContent = {
					'div h1 h2 h3 h4 h5 h6 ol p pre ul': {
						// Do not add elements, but only text-align style if element is validated by other rule.
						propertiesOnly: true,
						styles: !classes ? 'margin-left,margin-right' : null,
						classes: classes || null
					}
				};

				this.contentTransformations = [
					[ 'div: splitMarginShorthand' ],
					[ 'h1: splitMarginShorthand' ],
					[ 'h2: splitMarginShorthand' ],
					[ 'h3: splitMarginShorthand' ],
					[ 'h4: splitMarginShorthand' ],
					[ 'h5: splitMarginShorthand' ],
					[ 'h6: splitMarginShorthand' ],
					[ 'ol: splitMarginShorthand' ],
					[ 'p: splitMarginShorthand' ],
					[ 'pre: splitMarginShorthand' ],
					[ 'ul: splitMarginShorthand' ]
				];

				if ( this.enterBr )
					this.allowedContent.div = true;

				this.requiredContent = ( this.enterBr ? 'div' : 'p' ) +
					( classes ? '(' + classes.join( ',' ) + ')' : '{margin-left}' );

				this.jobs = {
					'20': {
						refresh: function( editor, path ) {
							var firstBlock = path.block || path.blockLimit;

							// Switch context from somewhere inside list item to list item,
							// if not found just assign self (doing nothing).
							if ( !firstBlock.is( $listItem ) ) {
								var ascendant = firstBlock.getAscendant( $listItem );

								firstBlock = ( ascendant && path.contains( ascendant ) ) || firstBlock;
							}

							// Switch context from list item to list
							// because indentblock can indent entire list
							// but not a single list element.

							if ( firstBlock.is( $listItem ) )
								firstBlock = firstBlock.getParent();

							//	[-] Context in the path or ENTER_BR
							//
							//		Don't try to indent if the element is out of
							//		this plugin's scope. This assertion is omitted
							//		if ENTER_BR is in use since there may be no block
							//		in the path.

							if ( !this.enterBr && !this.getContext( path ) )
								return TRISTATE_DISABLED;

							else if ( classes ) {

								//	[+] Context in the path or ENTER_BR
								//	[+] IndentClasses
								//
								//		If there are indentation classes, check if reached
								//		the highest level of indentation. If so, disable
								//		the command.

								if ( indentClassLeft.call( this, firstBlock, classes ) )
									return TRISTATE_OFF;
								else
									return TRISTATE_DISABLED;
							} else {

								//	[+] Context in the path or ENTER_BR
								//	[-] IndentClasses
								//	[+] Indenting
								//
								//		No indent-level limitations due to indent classes.
								//		Indent-like command can always be executed.

								if ( this.isIndent )
									return TRISTATE_OFF;

								//	[+] Context in the path or ENTER_BR
								//	[-] IndentClasses
								//	[-] Indenting
								//	[-] Block in the path
								//
								//		No block in path. There's no element to apply indentation
								//		so disable the command.

								else if ( !firstBlock )
									return TRISTATE_DISABLED;

								//	[+] Context in the path or ENTER_BR
								//	[-] IndentClasses
								//	[-] Indenting
								//	[+] Block in path.
								//
								//		Not using indentClasses but there is firstBlock.
								//		We can calculate current indentation level and
								//		try to increase/decrease it.

								else {
									return CKEDITOR[
										( getIndent( firstBlock ) || 0 ) <= 0 ? 'TRISTATE_DISABLED' : 'TRISTATE_OFF'
									];
								}
							}
						},

						exec: function( editor ) {
							var selection = editor.getSelection(),
								range = selection && selection.getRanges()[ 0 ],
								nearestListBlock;

							// If there's some list in the path, then it will be
							// a full-list indent by increasing or decreasing margin property.
							if ( ( nearestListBlock = editor.elementPath().contains( $list ) ) )
								indentElement.call( this, nearestListBlock, classes );

							// If no list in the path, use iterator to indent all the possible
							// paragraphs in the range, creating them if necessary.
							else {
								var iterator = range.createIterator(),
									enterMode = editor.config.enterMode,
									block;

								iterator.enforceRealBlocks = true;
								iterator.enlargeBr = enterMode != CKEDITOR.ENTER_BR;

								while ( ( block = iterator.getNextParagraph( enterMode == CKEDITOR.ENTER_P ? 'p' : 'div' ) ) ) {
									if ( !block.isReadOnly() )
										indentElement.call( this, block, classes );
								}
							}

							return true;
						}
					}
				};
			}

			CKEDITOR.tools.extend( commandDefinition.prototype, globalHelpers.specificDefinition.prototype, {
				// Elements that, if in an elementpath, will be handled by this
				// command. They restrict the scope of the plugin.
				context: { div: 1, dl: 1, h1: 1, h2: 1, h3: 1, h4: 1, h5: 1, h6: 1, ul: 1, ol: 1, p: 1, pre: 1, table: 1 },

				// A regex built on config#indentClasses to detect whether an
				// element has some indentClass or not.
				classNameRegex: classes ? new RegExp( '(?:^|\\s+)(' + classes.join( '|' ) + ')(?=$|\\s)' ) : null
			} );
		}
	} );

	// Generic indentation procedure for indentation of any element
	// either with margin property or config#indentClass.
	function indentElement( element, classes, dir ) {
		if ( element.getCustomData( 'indent_processed' ) )
			return;

		var editor = this.editor,
			isIndent = this.isIndent;

		if ( classes ) {
			// Transform current class f to indent step index.
			var indentClass = element.$.className.match( this.classNameRegex ),
				indentStep = 0;

			if ( indentClass ) {
				indentClass = indentClass[ 1 ];
				indentStep = CKEDITOR.tools.indexOf( classes, indentClass ) + 1;
			}

			// Operate on indent step index, transform indent step index
			// back to class name.
			if ( ( indentStep += isIndent ? 1 : -1 ) < 0 )
				return;

			indentStep = Math.min( indentStep, classes.length );
			indentStep = Math.max( indentStep, 0 );
			element.$.className = CKEDITOR.tools.ltrim( element.$.className.replace( this.classNameRegex, '' ) );

			if ( indentStep > 0 )
				element.addClass( classes[ indentStep - 1 ] );
		} else {
			var indentCssProperty = getIndentCss( element, dir ),
				currentOffset = parseInt( element.getStyle( indentCssProperty ), 10 ),
				indentOffset = editor.config.indentOffset || 40;

			if ( isNaN( currentOffset ) )
				currentOffset = 0;

			currentOffset += ( isIndent ? 1 : -1 ) * indentOffset;

			if ( currentOffset < 0 )
				return;

			currentOffset = Math.max( currentOffset, 0 );
			currentOffset = Math.ceil( currentOffset / indentOffset ) * indentOffset;

			element.setStyle(
				indentCssProperty,
				currentOffset ? currentOffset + ( editor.config.indentUnit || 'px' ) : ''
			);

			if ( element.getAttribute( 'style' ) === '' )
				element.removeAttribute( 'style' );
		}

		CKEDITOR.dom.element.setMarker( this.database, element, 'indent_processed', 1 );

		return;
	}

	// Method that checks if current indentation level for an element
	// reached the limit determined by config#indentClasses.
	function indentClassLeft( node, classes ) {
		var indentClass = node.$.className.match( this.classNameRegex ),
			isIndent = this.isIndent;

		// If node has one of the indentClasses:
		//	* If it holds the topmost indentClass, then
		//	  no more classes have left.
		//	* If it holds any other indentClass, it can use the next one
		//	  or the previous one.
		//	* Outdent is always possible. We can remove indentClass.
		if ( indentClass )
			return isIndent ? indentClass[ 1 ] != classes.slice( -1 ) : true;

		// If node has no class which belongs to indentClasses,
		// then it is at 0-level. It can be indented but not outdented.
		else
			return isIndent;
	}

	// Determines indent CSS property for an element according to
	// what is the direction of such element. It can be either `margin-left`
	// or `margin-right`.
	function getIndentCss( element, dir ) {
		return ( dir || element.getComputedStyle( 'direction' ) ) == 'ltr' ? 'margin-left' : 'margin-right';
	}

	// Return the numerical indent value of margin-left|right of an element,
	// considering element's direction. If element has no margin specified,
	// NaN is returned.
	function getIndent( element ) {
		return parseInt( element.getStyle( getIndentCss( element ) ), 10 );
	}
} )();

/**
 * A list of classes to use for indenting the contents. If set to `null`, no classes will be used
 * and instead the {@link #indentUnit} and {@link #indentOffset} properties will be used.
 *
 *		// Use the 'Indent1', 'Indent2', 'Indent3' classes.
 *		config.indentClasses = ['Indent1', 'Indent2', 'Indent3'];
 *
 * @cfg {Array} [indentClasses=null]
 * @member CKEDITOR.config
 */

/**
 * The size in {@link CKEDITOR.config#indentUnit indentation units} of each indentation step.
 *
 *		config.indentOffset = 4;
 *
 * @cfg {Number} [indentOffset=40]
 * @member CKEDITOR.config
 */

/**
 * The unit used for {@link CKEDITOR.config#indentOffset indentation offset}.
 *
 *		config.indentUnit = 'em';
 *
 * @cfg {String} [indentUnit='px']
 * @member CKEDITOR.config
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Justify commands.
 */

( function() {
	function getAlignment( element, useComputedState ) {
		useComputedState = useComputedState === undefined || useComputedState;

		var align;
		if ( useComputedState )
			align = element.getComputedStyle( 'text-align' );
		else {
			while ( !element.hasAttribute || !( element.hasAttribute( 'align' ) || element.getStyle( 'text-align' ) ) ) {
				var parent = element.getParent();
				if ( !parent )
					break;
				element = parent;
			}
			align = element.getStyle( 'text-align' ) || element.getAttribute( 'align' ) || '';
		}

		// Sometimes computed values doesn't tell.
		align && ( align = align.replace( /(?:-(?:moz|webkit)-)?(?:start|auto)/i, '' ) );

		!align && useComputedState && ( align = element.getComputedStyle( 'direction' ) == 'rtl' ? 'right' : 'left' );

		return align;
	}

	function justifyCommand( editor, name, value ) {
		this.editor = editor;
		this.name = name;
		this.value = value;
		this.context = 'p';
		var classes = editor.config.justifyClasses,
			blockTag = editor.config.enterMode == CKEDITOR.ENTER_P ? 'p' : 'div';

		if ( classes ) {
			switch ( value ) {
				case 'left':
					this.cssClassName = classes[ 0 ];
					break;
				case 'center':
					this.cssClassName = classes[ 1 ];
					break;
				case 'right':
					this.cssClassName = classes[ 2 ];
					break;
				case 'justify':
					this.cssClassName = classes[ 3 ];
					break;
			}

			this.cssClassRegex = new RegExp( '(?:^|\\s+)(?:' + classes.join( '|' ) + ')(?=$|\\s)' );
			this.requiredContent = blockTag + '(' + this.cssClassName + ')';
		}
		else {
			this.requiredContent = blockTag + '{text-align}';
		}

		this.allowedContent = {
			'caption div h1 h2 h3 h4 h5 h6 p pre td th li': {
				// Do not add elements, but only text-align style if element is validated by other rule.
				propertiesOnly: true,
				styles: this.cssClassName ? null : 'text-align',
				classes: this.cssClassName || null
			}
		};

		// In enter mode BR we need to allow here for div, because when non other
		// feature allows div justify is the only plugin that uses it.
		if ( editor.config.enterMode == CKEDITOR.ENTER_BR )
			this.allowedContent.div = true;
	}

	function onDirChanged( e ) {
		var editor = e.editor;

		var range = editor.createRange();
		range.setStartBefore( e.data.node );
		range.setEndAfter( e.data.node );

		var walker = new CKEDITOR.dom.walker( range ),
			node;

		while ( ( node = walker.next() ) ) {
			if ( node.type == CKEDITOR.NODE_ELEMENT ) {
				// A child with the defined dir is to be ignored.
				if ( !node.equals( e.data.node ) && node.getDirection() ) {
					range.setStartAfter( node );
					walker = new CKEDITOR.dom.walker( range );
					continue;
				}

				// Switch the alignment.
				var classes = editor.config.justifyClasses;
				if ( classes ) {
					// The left align class.
					if ( node.hasClass( classes[ 0 ] ) ) {
						node.removeClass( classes[ 0 ] );
						node.addClass( classes[ 2 ] );
					}
					// The right align class.
					else if ( node.hasClass( classes[ 2 ] ) ) {
						node.removeClass( classes[ 2 ] );
						node.addClass( classes[ 0 ] );
					}
				}

				// Always switch CSS margins.
				var style = 'text-align';
				var align = node.getStyle( style );

				if ( align == 'left' )
					node.setStyle( style, 'right' );
				else if ( align == 'right' )
					node.setStyle( style, 'left' );
			}
		}
	}

	justifyCommand.prototype = {
		exec: function( editor ) {
			var selection = editor.getSelection(),
				enterMode = editor.config.enterMode;

			if ( !selection )
				return;

			var bookmarks = selection.createBookmarks(),
				ranges = selection.getRanges();

			var cssClassName = this.cssClassName,
				iterator, block;

			var useComputedState = editor.config.useComputedState;
			useComputedState = useComputedState === undefined || useComputedState;

			for ( var i = ranges.length - 1; i >= 0; i-- ) {
				iterator = ranges[ i ].createIterator();
				iterator.enlargeBr = enterMode != CKEDITOR.ENTER_BR;

				while ( ( block = iterator.getNextParagraph( enterMode == CKEDITOR.ENTER_P ? 'p' : 'div' ) ) ) {
					if ( block.isReadOnly() )
						continue;

					// Check if style or class might be applied to currently processed element (#455).
					var tag = block.getName(),
						isAllowedTextAlign, isAllowedCssClass;

					isAllowedTextAlign = editor.activeFilter.check( tag + '{text-align}' );
					isAllowedCssClass = editor.activeFilter.check( tag + '(' + cssClassName + ')' );

					if ( !isAllowedCssClass && !isAllowedTextAlign ) {
						continue;
					}

					block.removeAttribute( 'align' );
					block.removeStyle( 'text-align' );

					// Remove any of the alignment classes from the className.
					var className = cssClassName && ( block.$.className = CKEDITOR.tools.ltrim( block.$.className.replace( this.cssClassRegex, '' ) ) );

					var apply = ( this.state == CKEDITOR.TRISTATE_OFF ) && ( !useComputedState || ( getAlignment( block, true ) != this.value ) );

					if ( cssClassName && isAllowedCssClass ) {
						// Append the desired class name.
						if ( apply )
							block.addClass( cssClassName );
						else if ( !className )
							block.removeAttribute( 'class' );
					} else if ( apply && isAllowedTextAlign ) {
						block.setStyle( 'text-align', this.value );
					}
				}

			}

			editor.focus();
			editor.forceNextSelectionCheck();
			selection.selectBookmarks( bookmarks );
		},

		refresh: function( editor, path ) {
			var firstBlock = path.block || path.blockLimit,
				name = firstBlock.getName(),
				isEditable = firstBlock.equals( editor.editable() ),
				isStylable = this.cssClassName ? editor.activeFilter.check( name + '(' + this.cssClassName + ')' ) :
					editor.activeFilter.check( name + '{text-align}' );

			// #455
			// 1. Check if we are directly in editbale. Justification should be always allowed, and not highlighted.
			//    Checking situation `body > ul` where ul is selected and path.blockLimit returns editable.
			// 2. Check if current element can have applied specific class.
			// 3. Check if current element can have applied text-align style.
			if ( isEditable && !CKEDITOR.dtd.$list[ path.lastElement.getName() ] ) {
				this.setState( CKEDITOR.TRISTATE_OFF );
			} else if ( !isEditable && isStylable ) {
				// 2 & 3 in one condition.
				this.setState( getAlignment( firstBlock, this.editor.config.useComputedState ) == this.value ? CKEDITOR.TRISTATE_ON : CKEDITOR.TRISTATE_OFF );
			} else {
				this.setState( CKEDITOR.TRISTATE_DISABLED );
			}
		}
	};

	CKEDITOR.plugins.add( 'justify', {
		init: function( editor ) {
			if ( editor.blockless )
				return;

			var left = new justifyCommand( editor, 'justifyleft', 'left' ),
				center = new justifyCommand( editor, 'justifycenter', 'center' ),
				right = new justifyCommand( editor, 'justifyright', 'right' ),
				justify = new justifyCommand( editor, 'justifyblock', 'justify' );

			editor.addCommand( 'justifyleft', left );
			editor.addCommand( 'justifycenter', center );
			editor.addCommand( 'justifyright', right );
			editor.addCommand( 'justifyblock', justify );

			if ( editor.ui.addButton ) {
				editor.ui.addButton( 'JustifyLeft', {
					label: editor.lang.common.alignLeft,
					command: 'justifyleft',
					toolbar: 'align,10'
				} );
				editor.ui.addButton( 'JustifyCenter', {
					label: editor.lang.common.center,
					command: 'justifycenter',
					toolbar: 'align,20'
				} );
				editor.ui.addButton( 'JustifyRight', {
					label: editor.lang.common.alignRight,
					command: 'justifyright',
					toolbar: 'align,30'
				} );
				editor.ui.addButton( 'JustifyBlock', {
					label: editor.lang.common.justify,
					command: 'justifyblock',
					toolbar: 'align,40'
				} );
			}
			editor.on( 'dirChanged', onDirChanged );
		}
	} );
} )();

/**
 * List of classes to use for aligning the contents. If it's `null`, no classes will be used
 * and instead the corresponding CSS values will be used.
 *
 * The array should contain 4 members, in the following order: left, center, right, justify.
 *
 *		// Use the classes 'AlignLeft', 'AlignCenter', 'AlignRight', 'AlignJustify'
 *		config.justifyClasses = [ 'AlignLeft', 'AlignCenter', 'AlignRight', 'AlignJustify' ];
 *
 * @cfg {Array} [justifyClasses=null]
 * @member CKEDITOR.config
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

( function() {
	var cssStyle = CKEDITOR.htmlParser.cssStyle,
		cssLength = CKEDITOR.tools.cssLength;

	var cssLengthRegex = /^((?:\d*(?:\.\d+))|(?:\d+))(.*)?$/i;

	// Replacing the former CSS length value with the later one, with
	// adjustment to the length  unit.
	function replaceCssLength( length1, length2 ) {
		var parts1 = cssLengthRegex.exec( length1 ),
			parts2 = cssLengthRegex.exec( length2 );

		// Omit pixel length unit when necessary,
		// e.g. replaceCssLength( 10, '20px' ) -> 20
		if ( parts1 ) {
			if ( !parts1[ 2 ] && parts2[ 2 ] == 'px' )
				return parts2[ 1 ];
			if ( parts1[ 2 ] == 'px' && !parts2[ 2 ] )
				return parts2[ 1 ] + 'px';
		}

		return length2;
	}

	var htmlFilterRules = {
		elements: {
			$: function( element ) {
				var attributes = element.attributes,
					realHtml = attributes && attributes[ 'data-cke-realelement' ],
					realFragment = realHtml && new CKEDITOR.htmlParser.fragment.fromHtml( decodeURIComponent( realHtml ) ),
					realElement = realFragment && realFragment.children[ 0 ];

				// Width/height in the fake object are subjected to clone into the real element.
				if ( realElement && element.attributes[ 'data-cke-resizable' ] ) {
					var styles = new cssStyle( element ).rules,
						realAttrs = realElement.attributes,
						width = styles.width,
						height = styles.height;

					width && ( realAttrs.width = replaceCssLength( realAttrs.width, width ) );
					height && ( realAttrs.height = replaceCssLength( realAttrs.height, height ) );
				}

				return realElement;
			}
		}
	};

	CKEDITOR.plugins.add( 'fakeobjects', {
		// jscs:disable maximumLineLength
		// jscs:enable maximumLineLength

		init: function( editor ) {
			// Allow image with all styles and classes plus src, alt and title attributes.
			// We need them when fakeobject is pasted.
			editor.filter.allow( 'img[!data-cke-realelement,src,alt,title](*){*}', 'fakeobjects' );
		},

		afterInit: function( editor ) {
			var dataProcessor = editor.dataProcessor,
				htmlFilter = dataProcessor && dataProcessor.htmlFilter;

			if ( htmlFilter ) {
				htmlFilter.addRules( htmlFilterRules, {
					applyToAll: true
				} );
			}
		}
	} );

	/**
	 * Creates fake {@link CKEDITOR.dom.element} based on real element.
	 * Fake element is an img with special attributes, which keep real element properties.
	 *
	 * @member CKEDITOR.editor
	 * @param {CKEDITOR.dom.element} realElement Real element to transform.
	 * @param {String} className Class name which will be used as class of fake element.
	 * @param {String} realElementType Stores type of fake element.
	 * @param {Boolean} isResizable Keeps information if element is resizable.
	 * @returns {CKEDITOR.dom.element} Fake element.
	 */
	CKEDITOR.editor.prototype.createFakeElement = function( realElement, className, realElementType, isResizable ) {
		var lang = this.lang.fakeobjects,
			label = lang[ realElementType ] || lang.unknown;

		var attributes = {
			'class': className,
			'data-cke-realelement': encodeURIComponent( realElement.getOuterHtml() ),
			'data-cke-real-node-type': realElement.type,
			alt: label,
			title: label,
			align: realElement.getAttribute( 'align' ) || ''
		};

		// Do not set "src" on high-contrast so the alt text is displayed. (https://dev.ckeditor.com/ticket/8945)
		if ( !CKEDITOR.env.hc )
			attributes.src = CKEDITOR.tools.transparentImageData;

		if ( realElementType )
			attributes[ 'data-cke-real-element-type' ] = realElementType;

		if ( isResizable ) {
			attributes[ 'data-cke-resizable' ] = isResizable;

			var fakeStyle = new cssStyle();

			var width = realElement.getAttribute( 'width' ),
				height = realElement.getAttribute( 'height' );

			width && ( fakeStyle.rules.width = cssLength( width ) );
			height && ( fakeStyle.rules.height = cssLength( height ) );
			fakeStyle.populate( attributes );
		}

		return this.document.createElement( 'img', { attributes: attributes } );
	};

	/**
	 * Creates fake {@link CKEDITOR.htmlParser.element} based on real element.
	 *
	 * @member CKEDITOR.editor
	 * @param {CKEDITOR.dom.element} realElement Real element to transform.
	 * @param {String} className Class name which will be used as class of fake element.
	 * @param {String} realElementType Store type of fake element.
	 * @param {Boolean} isResizable Keep information if element is resizable.
	 * @returns {CKEDITOR.htmlParser.element} Fake htmlParser element.
	 */
	CKEDITOR.editor.prototype.createFakeParserElement = function( realElement, className, realElementType, isResizable ) {
		var lang = this.lang.fakeobjects,
			label = lang[ realElementType ] || lang.unknown,
			html;

		var writer = new CKEDITOR.htmlParser.basicWriter();
		realElement.writeHtml( writer );
		html = writer.getHtml();

		var attributes = {
			'class': className,
			'data-cke-realelement': encodeURIComponent( html ),
			'data-cke-real-node-type': realElement.type,
			alt: label,
			title: label,
			align: realElement.attributes.align || ''
		};

		// Do not set "src" on high-contrast so the alt text is displayed. (https://dev.ckeditor.com/ticket/8945)
		if ( !CKEDITOR.env.hc )
			attributes.src = CKEDITOR.tools.transparentImageData;

		if ( realElementType )
			attributes[ 'data-cke-real-element-type' ] = realElementType;

		if ( isResizable ) {
			attributes[ 'data-cke-resizable' ] = isResizable;
			var realAttrs = realElement.attributes,
				fakeStyle = new cssStyle();

			var width = realAttrs.width,
				height = realAttrs.height;

			width !== undefined && ( fakeStyle.rules.width = cssLength( width ) );
			height !== undefined && ( fakeStyle.rules.height = cssLength( height ) );
			fakeStyle.populate( attributes );
		}

		return new CKEDITOR.htmlParser.element( 'img', attributes );
	};

	/**
	 * Creates {@link CKEDITOR.dom.element} from fake element.
	 *
	 * @member CKEDITOR.editor
	 * @param {CKEDITOR.dom.element} fakeElement Fake element to transform.
	 * @returns {CKEDITOR.dom.element/null} Returns real element or `null` if transformed element wasn't fake.
	 */
	CKEDITOR.editor.prototype.restoreRealElement = function( fakeElement ) {
		if ( fakeElement.data( 'cke-real-node-type' ) != CKEDITOR.NODE_ELEMENT )
			return null;

		var element = CKEDITOR.dom.element.createFromHtml( decodeURIComponent( fakeElement.data( 'cke-realelement' ) ), this.document );

		if ( fakeElement.data( 'cke-resizable' ) ) {
			var width = fakeElement.getStyle( 'width' ),
				height = fakeElement.getStyle( 'height' );

			width && element.setAttribute( 'width', replaceCssLength( element.getAttribute( 'width' ), width ) );
			height && element.setAttribute( 'height', replaceCssLength( element.getAttribute( 'height' ), height ) );
		}

		return element;
	};

} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

'use strict';

( function() {
	CKEDITOR.plugins.add( 'link', {
		requires: 'dialog,fakeobjects',
		// jscs:disable maximumLineLength
		// jscs:enable maximumLineLength
		onLoad: function() {
			// Add the CSS styles for anchor placeholders.
			var iconPath = CKEDITOR.getUrl( this.path + 'images' + ( CKEDITOR.env.hidpi ? '/hidpi' : '' ) + '/anchor.png' ),
				baseStyle = 'background:url(' + iconPath + ') no-repeat %1 center;border:1px dotted #00f;background-size:16px;';

			var template = '.%2 a.cke_anchor,' +
				'.%2 a.cke_anchor_empty' +
				',.cke_editable.%2 a[name]' +
				',.cke_editable.%2 a[data-cke-saved-name]' +
				'{' +
					baseStyle +
					'padding-%1:18px;' +
					// Show the arrow cursor for the anchor image (FF at least).
					'cursor:auto;' +
				'}' +
				'.%2 img.cke_anchor' +
				'{' +
					baseStyle +
					'width:16px;' +
					'min-height:15px;' +
					// The default line-height on IE.
					'height:1.15em;' +
					// Opera works better with "middle" (even if not perfect)
					'vertical-align:text-bottom;' +
				'}';

			// Styles with contents direction awareness.
			function cssWithDir( dir ) {
				return template.replace( /%1/g, dir == 'rtl' ? 'right' : 'left' ).replace( /%2/g, 'cke_contents_' + dir );
			}

			CKEDITOR.addCss( cssWithDir( 'ltr' ) + cssWithDir( 'rtl' ) );
		},

		init: function( editor ) {
			var allowed = 'a[!href]',
				required = 'a[href]';

			if ( CKEDITOR.dialog.isTabEnabled( editor, 'link', 'advanced' ) )
				allowed = allowed.replace( ']', ',accesskey,charset,dir,id,lang,name,rel,tabindex,title,type,download]{*}(*)' );
			if ( CKEDITOR.dialog.isTabEnabled( editor, 'link', 'target' ) )
				allowed = allowed.replace( ']', ',target,onclick]' );

			// Add the link and unlink buttons.
			editor.addCommand( 'link', new CKEDITOR.dialogCommand( 'link', {
				allowedContent: allowed,
				requiredContent: required
			} ) );
			editor.addCommand( 'anchor', new CKEDITOR.dialogCommand( 'anchor', {
				allowedContent: 'a[!name,id]',
				requiredContent: 'a[name]'
			} ) );
			editor.addCommand( 'unlink', new CKEDITOR.unlinkCommand() );
			editor.addCommand( 'removeAnchor', new CKEDITOR.removeAnchorCommand() );

			editor.setKeystroke( CKEDITOR.CTRL + 76 /*L*/, 'link' );

			// (#2478)
			editor.setKeystroke( CKEDITOR.CTRL + 75 /*K*/, 'link' );

			if ( editor.ui.addButton ) {
				editor.ui.addButton( 'Link', {
					label: editor.lang.link.toolbar,
					command: 'link',
					toolbar: 'links,10'
				} );
				editor.ui.addButton( 'Unlink', {
					label: editor.lang.link.unlink,
					command: 'unlink',
					toolbar: 'links,20'
				} );
				editor.ui.addButton( 'Anchor', {
					label: editor.lang.link.anchor.toolbar,
					command: 'anchor',
					toolbar: 'links,30'
				} );
			}

			CKEDITOR.dialog.add( 'link', this.path + 'dialogs/link.js' );
			CKEDITOR.dialog.add( 'anchor', this.path + 'dialogs/anchor.js' );

			editor.on( 'doubleclick', function( evt ) {
				// If the link has descendants and the last part of it is also a part of a word partially
				// unlinked, clicked element may be a descendant of the link, not the link itself (https://dev.ckeditor.com/ticket/11956).
				// The evt.data.element.getAscendant( 'img', 1 ) condition allows opening anchor dialog if the anchor is empty (#501).
				var element = evt.data.element.getAscendant( { a: 1, img: 1 }, true );

				if ( element && !element.isReadOnly() ) {
					if ( element.is( 'a' ) ) {
						evt.data.dialog = ( element.getAttribute( 'name' ) && ( !element.getAttribute( 'href' ) || !element.getChildCount() ) ) ? 'anchor' : 'link';

						// Pass the link to be selected along with event data.
						evt.data.link = element;
					} else if ( CKEDITOR.plugins.link.tryRestoreFakeAnchor( editor, element ) ) {
						evt.data.dialog = 'anchor';
					}
				}
			}, null, null, 0 );

			// If event was cancelled, link passed in event data will not be selected.
			editor.on( 'doubleclick', function( evt ) {
				// Make sure both links and anchors are selected (https://dev.ckeditor.com/ticket/11822).
				if ( evt.data.dialog in { link: 1, anchor: 1 } && evt.data.link )
					editor.getSelection().selectElement( evt.data.link );
			}, null, null, 20 );

			// If the "menu" plugin is loaded, register the menu items.
			if ( editor.addMenuItems ) {
				editor.addMenuItems( {
					anchor: {
						label: editor.lang.link.anchor.menu,
						command: 'anchor',
						group: 'anchor',
						order: 1
					},

					removeAnchor: {
						label: editor.lang.link.anchor.remove,
						command: 'removeAnchor',
						group: 'anchor',
						order: 5
					},

					link: {
						label: editor.lang.link.menu,
						command: 'link',
						group: 'link',
						order: 1
					},

					unlink: {
						label: editor.lang.link.unlink,
						command: 'unlink',
						group: 'link',
						order: 5
					}
				} );
			}

			// If the "contextmenu" plugin is loaded, register the listeners.
			if ( editor.contextMenu ) {
				editor.contextMenu.addListener( function( element ) {
					if ( !element || element.isReadOnly() )
						return null;

					var anchor = CKEDITOR.plugins.link.tryRestoreFakeAnchor( editor, element );

					if ( !anchor && !( anchor = CKEDITOR.plugins.link.getSelectedLink( editor ) ) )
						return null;

					var menu = {};

					if ( anchor.getAttribute( 'href' ) && anchor.getChildCount() )
						menu = { link: CKEDITOR.TRISTATE_OFF, unlink: CKEDITOR.TRISTATE_OFF };

					if ( anchor && anchor.hasAttribute( 'name' ) )
						menu.anchor = menu.removeAnchor = CKEDITOR.TRISTATE_OFF;

					return menu;
				} );
			}

			this.compiledProtectionFunction = getCompiledProtectionFunction( editor );
		},

		afterInit: function( editor ) {
			// Empty anchors upcasting to fake objects.
			editor.dataProcessor.dataFilter.addRules( {
				elements: {
					a: function( element ) {
						if ( !element.attributes.name )
							return null;

						if ( !element.children.length )
							return editor.createFakeParserElement( element, 'cke_anchor', 'anchor' );

						return null;
					}
				}
			} );

			var pathFilters = editor._.elementsPath && editor._.elementsPath.filters;
			if ( pathFilters ) {
				pathFilters.push( function( element, name ) {
					if ( name == 'a' ) {
						if ( CKEDITOR.plugins.link.tryRestoreFakeAnchor( editor, element ) || ( element.getAttribute( 'name' ) && ( !element.getAttribute( 'href' ) || !element.getChildCount() ) ) )
							return 'anchor';
					}
				} );
			}
		}
	} );

	// Loads the parameters in a selected link to the link dialog fields.
	var javascriptProtocolRegex = /^javascript:/,
		emailRegex = /^mailto:([^?]+)(?:\?(.+))?$/,
		emailSubjectRegex = /subject=([^;?:@&=$,\/]*)/i,
		emailBodyRegex = /body=([^;?:@&=$,\/]*)/i,
		anchorRegex = /^#(.*)$/,
		urlRegex = /^((?:http|https|ftp|news):\/\/)?(.*)$/,
		selectableTargets = /^(_(?:self|top|parent|blank))$/,
		encodedEmailLinkRegex = /^javascript:void\(location\.href='mailto:'\+String\.fromCharCode\(([^)]+)\)(?:\+'(.*)')?\)$/,
		functionCallProtectedEmailLinkRegex = /^javascript:([^(]+)\(([^)]+)\)$/,
		popupRegex = /\s*window.open\(\s*this\.href\s*,\s*(?:'([^']*)'|null)\s*,\s*'([^']*)'\s*\)\s*;\s*return\s*false;*\s*/,
		popupFeaturesRegex = /(?:^|,)([^=]+)=(\d+|yes|no)/gi,
		telRegex = /^tel:(.*)$/;

	var advAttrNames = {
		id: 'advId',
		dir: 'advLangDir',
		accessKey: 'advAccessKey',
		// 'data-cke-saved-name': 'advName',
		name: 'advName',
		lang: 'advLangCode',
		tabindex: 'advTabIndex',
		title: 'advTitle',
		type: 'advContentType',
		'class': 'advCSSClasses',
		charset: 'advCharset',
		style: 'advStyles',
		rel: 'advRel'
	};

	function unescapeSingleQuote( str ) {
		return str.replace( /\\'/g, '\'' );
	}

	function escapeSingleQuote( str ) {
		return str.replace( /'/g, '\\$&' );
	}

	function protectEmailAddressAsEncodedString( address ) {
		var charCode,
			length = address.length,
			encodedChars = [];

		for ( var i = 0; i < length; i++ ) {
			charCode = address.charCodeAt( i );
			encodedChars.push( charCode );
		}

		return 'String.fromCharCode(' + encodedChars.join( ',' ) + ')';
	}

	function protectEmailLinkAsFunction( editor, email ) {
		var plugin = editor.plugins.link,
			name = plugin.compiledProtectionFunction.name,
			params = plugin.compiledProtectionFunction.params,
			paramName, paramValue, retval;

		retval = [ name, '(' ];
		for ( var i = 0; i < params.length; i++ ) {
			paramName = params[ i ].toLowerCase();
			paramValue = email[ paramName ];

			i > 0 && retval.push( ',' );
			retval.push( '\'', paramValue ? escapeSingleQuote( encodeURIComponent( email[ paramName ] ) ) : '', '\'' );
		}
		retval.push( ')' );
		return retval.join( '' );
	}

	function getCompiledProtectionFunction( editor ) {
		var emailProtection = editor.config.emailProtection || '',
			compiledProtectionFunction;

		// Compile the protection function pattern.
		if ( emailProtection && emailProtection != 'encode' ) {
			compiledProtectionFunction = {};

			emailProtection.replace( /^([^(]+)\(([^)]+)\)$/, function( match, funcName, params ) {
				compiledProtectionFunction.name = funcName;
				compiledProtectionFunction.params = [];
				params.replace( /[^,\s]+/g, function( param ) {
					compiledProtectionFunction.params.push( param );
				} );
			} );
		}

		return compiledProtectionFunction;
	}

	/**
	 * Set of Link plugin helpers.
	 *
	 * @class
	 * @singleton
	 */
	CKEDITOR.plugins.link = {
		/**
		 * Get the surrounding link element of the current selection.
		 *
		 *		CKEDITOR.plugins.link.getSelectedLink( editor );
		 *
		 *		// The following selections will all return the link element.
		 *
		 *		<a href="#">li^nk</a>
		 *		<a href="#">[link]</a>
		 *		text[<a href="#">link]</a>
		 *		<a href="#">li[nk</a>]
		 *		[<b><a href="#">li]nk</a></b>]
		 *		[<a href="#"><b>li]nk</b></a>
		 *
		 * @since 3.2.1
		 * @param {CKEDITOR.editor} editor
		 * @param {Boolean} [returnMultiple=false] Indicates whether the function should return only the first selected link or all of them.
		 * @returns {CKEDITOR.dom.element/CKEDITOR.dom.element[]/null} A single link element or an array of link
		 * elements relevant to the current selection.
		 */
		getSelectedLink: function( editor, returnMultiple ) {
			var selection = editor.getSelection(),
				selectedElement = selection.getSelectedElement(),
				ranges = selection.getRanges(),
				links = [],
				link,
				range,
				i;

			if ( !returnMultiple && selectedElement && selectedElement.is( 'a' ) ) {
				return selectedElement;
			}

			for ( i = 0; i < ranges.length; i++ ) {
				range = selection.getRanges()[ i ];

				// Skip bogus to cover cases of multiple selection inside tables (#tp2245).
				// Shrink to element to prevent losing anchor (#859).
				range.shrink( CKEDITOR.SHRINK_ELEMENT, true, { skipBogus: true } );
				link = editor.elementPath( range.getCommonAncestor() ).contains( 'a', 1 );

				if ( link && returnMultiple ) {
					links.push( link );
				} else if ( link ) {
					return link;
				}
			}

			return returnMultiple ? links : null;
		},

		/**
		 * Collects anchors available in the editor (i.e. used by the Link plugin).
		 * Note that the scope of search is different for inline (the "global" document) and
		 * classic (`iframe`-based) editors (the "inner" document).
		 *
		 * @since 4.3.3
		 * @param {CKEDITOR.editor} editor
		 * @returns {CKEDITOR.dom.element[]} An array of anchor elements.
		 */
		getEditorAnchors: function( editor ) {
			var editable = editor.editable(),

				// The scope of search for anchors is the entire document for inline editors
				// and editor's editable for classic editor/divarea (https://dev.ckeditor.com/ticket/11359).
				scope = ( editable.isInline() && !editor.plugins.divarea ) ? editor.document : editable,

				links = scope.getElementsByTag( 'a' ),
				imgs = scope.getElementsByTag( 'img' ),
				anchors = [],
				i = 0,
				item;

			// Retrieve all anchors within the scope.
			while ( ( item = links.getItem( i++ ) ) ) {
				if ( item.data( 'cke-saved-name' ) || item.hasAttribute( 'name' ) ) {
					anchors.push( {
						name: item.data( 'cke-saved-name' ) || item.getAttribute( 'name' ),
						id: item.getAttribute( 'id' )
					} );
				}
			}
			// Retrieve all "fake anchors" within the scope.
			i = 0;

			while ( ( item = imgs.getItem( i++ ) ) ) {
				if ( ( item = this.tryRestoreFakeAnchor( editor, item ) ) ) {
					anchors.push( {
						name: item.getAttribute( 'name' ),
						id: item.getAttribute( 'id' )
					} );
				}
			}

			return anchors;
		},

		/**
		 * Opera and WebKit do not make it possible to select empty anchors. Fake
		 * elements must be used for them.
		 *
		 * @readonly
		 * @deprecated 4.3.3 It is set to `true` in every browser.
		 * @property {Boolean}
		 */
		fakeAnchor: true,

		/**
		 * For browsers that do not support CSS3 `a[name]:empty()`. Note that IE9 is included because of https://dev.ckeditor.com/ticket/7783.
		 *
		 * @readonly
		 * @deprecated 4.3.3 It is set to `false` in every browser.
		 * @property {Boolean} synAnchorSelector
		 */

		/**
		 * For browsers that have editing issues with an empty anchor.
		 *
		 * @readonly
		 * @deprecated 4.3.3 It is set to `false` in every browser.
		 * @property {Boolean} emptyAnchorFix
		 */

		/**
		 * Returns an element representing a real anchor restored from a fake anchor.
		 *
		 * @param {CKEDITOR.editor} editor
		 * @param {CKEDITOR.dom.element} element
		 * @returns {CKEDITOR.dom.element} Restored anchor element or nothing if the
		 * passed element was not a fake anchor.
		 */
		tryRestoreFakeAnchor: function( editor, element ) {
			if ( element && element.data( 'cke-real-element-type' ) && element.data( 'cke-real-element-type' ) == 'anchor' ) {
				var link = editor.restoreRealElement( element );
				if ( link.data( 'cke-saved-name' ) )
					return link;
			}
		},

		/**
		 * Parses attributes of the link element and returns an object representing
		 * the current state (data) of the link. This data format is a plain object accepted
		 * e.g. by the Link dialog window and {@link #getLinkAttributes}.
		 *
		 * **Note:** Data model format produced by the parser must be compatible with the Link
		 * plugin dialog because it is passed directly to {@link CKEDITOR.dialog#setupContent}.
		 *
		 * @since 4.4.0
		 * @param {CKEDITOR.editor} editor
		 * @param {CKEDITOR.dom.element} element
		 * @returns {Object} An object of link data.
		 */
		parseLinkAttributes: function( editor, element ) {
			var href = ( element && ( element.data( 'cke-saved-href' ) || element.getAttribute( 'href' ) ) ) || '',
				compiledProtectionFunction = editor.plugins.link.compiledProtectionFunction,
				emailProtection = editor.config.emailProtection,
				javascriptMatch, emailMatch, anchorMatch, urlMatch, telMatch,
				retval = {};

			if ( ( javascriptMatch = href.match( javascriptProtocolRegex ) ) ) {
				if ( emailProtection == 'encode' ) {
					href = href.replace( encodedEmailLinkRegex, function( match, protectedAddress, rest ) {
						// Without it 'undefined' is appended to e-mails without subject and body (https://dev.ckeditor.com/ticket/9192).
						rest = rest || '';

						return 'mailto:' +
							String.fromCharCode.apply( String, protectedAddress.split( ',' ) ) +
							unescapeSingleQuote( rest );
					} );
				}
				// Protected email link as function call.
				else if ( emailProtection ) {
					href.replace( functionCallProtectedEmailLinkRegex, function( match, funcName, funcArgs ) {
						if ( funcName == compiledProtectionFunction.name ) {
							retval.type = 'email';
							var email = retval.email = {};

							var paramRegex = /[^,\s]+/g,
								paramQuoteRegex = /(^')|('$)/g,
								paramsMatch = funcArgs.match( paramRegex ),
								paramsMatchLength = paramsMatch.length,
								paramName, paramVal;

							for ( var i = 0; i < paramsMatchLength; i++ ) {
								paramVal = decodeURIComponent( unescapeSingleQuote( paramsMatch[ i ].replace( paramQuoteRegex, '' ) ) );
								paramName = compiledProtectionFunction.params[ i ].toLowerCase();
								email[ paramName ] = paramVal;
							}
							email.address = [ email.name, email.domain ].join( '@' );
						}
					} );
				}
			}

			if ( !retval.type ) {
				if ( ( anchorMatch = href.match( anchorRegex ) ) ) {
					retval.type = 'anchor';
					retval.anchor = {};
					retval.anchor.name = retval.anchor.id = anchorMatch[ 1 ];
				} else if ( ( telMatch = href.match( telRegex ) ) ) {
					retval.type = 'tel';
					retval.tel = telMatch[ 1 ];
				}
				// Protected email link as encoded string.
				else if ( ( emailMatch = href.match( emailRegex ) ) ) {
					var subjectMatch = href.match( emailSubjectRegex ),
						bodyMatch = href.match( emailBodyRegex );

					retval.type = 'email';
					var email = ( retval.email = {} );
					email.address = emailMatch[ 1 ];
					subjectMatch && ( email.subject = decodeURIComponent( subjectMatch[ 1 ] ) );
					bodyMatch && ( email.body = decodeURIComponent( bodyMatch[ 1 ] ) );
				}
				// urlRegex matches empty strings, so need to check for href as well.
				else if ( href && ( urlMatch = href.match( urlRegex ) ) ) {
					retval.type = 'url';
					retval.url = {};
					retval.url.protocol = urlMatch[ 1 ];
					retval.url.url = urlMatch[ 2 ];
				}
			}

			// Load target and popup settings.
			if ( element ) {
				var target = element.getAttribute( 'target' );

				// IE BUG: target attribute is an empty string instead of null in IE if it's not set.
				if ( !target ) {
					var onclick = element.data( 'cke-pa-onclick' ) || element.getAttribute( 'onclick' ),
						onclickMatch = onclick && onclick.match( popupRegex );

					if ( onclickMatch ) {
						retval.target = {
							type: 'popup',
							name: onclickMatch[ 1 ]
						};

						var featureMatch;
						while ( ( featureMatch = popupFeaturesRegex.exec( onclickMatch[ 2 ] ) ) ) {
							// Some values should remain numbers (https://dev.ckeditor.com/ticket/7300)
							if ( ( featureMatch[ 2 ] == 'yes' || featureMatch[ 2 ] == '1' ) && !( featureMatch[ 1 ] in { height: 1, width: 1, top: 1, left: 1 } ) )
								retval.target[ featureMatch[ 1 ] ] = true;
							else if ( isFinite( featureMatch[ 2 ] ) )
								retval.target[ featureMatch[ 1 ] ] = featureMatch[ 2 ];
						}
					}
				} else {
					retval.target = {
						type: target.match( selectableTargets ) ? target : 'frame',
						name: target
					};
				}

				var download = element.getAttribute( 'download' );
				if ( download !== null ) {
					retval.download = true;
				}

				var advanced = {};

				for ( var a in advAttrNames ) {
					var val = element.getAttribute( a );

					if ( val )
						advanced[ advAttrNames[ a ] ] = val;
				}

				var advName = element.data( 'cke-saved-name' ) || advanced.advName;

				if ( advName )
					advanced.advName = advName;

				if ( !CKEDITOR.tools.isEmpty( advanced ) )
					retval.advanced = advanced;
			}

			return retval;
		},

		/**
		 * Converts link data produced by {@link #parseLinkAttributes} into an object which consists
		 * of attributes to be set (with their values) and an array of attributes to be removed.
		 * This method can be used to compose or to update any link element with the given data.
		 *
		 * @since 4.4.0
		 * @param {CKEDITOR.editor} editor
		 * @param {Object} data Data in {@link #parseLinkAttributes} format.
		 * @returns {Object} An object consisting of two keys, i.e.:
		 *
		 *		{
		 *			// Attributes to be set.
		 *			set: {
		 *				href: 'http://foo.bar',
		 *				target: 'bang'
		 *			},
		 *			// Attributes to be removed.
		 *			removed: [
		 *				'id', 'style'
		 *			]
		 *		}
		 *
		 */
		getLinkAttributes: function( editor, data ) {
			var emailProtection = editor.config.emailProtection || '',
				set = {};

			// Compose the URL.
			switch ( data.type ) {
				case 'url':
					var protocol = ( data.url && data.url.protocol !== undefined ) ? data.url.protocol : 'http://',
						url = ( data.url && CKEDITOR.tools.trim( data.url.url ) ) || '';

					set[ 'data-cke-saved-href' ] = ( url.indexOf( '/' ) === 0 ) ? url : protocol + url;

					break;
				case 'anchor':
					var name = ( data.anchor && data.anchor.name ),
						id = ( data.anchor && data.anchor.id );

					set[ 'data-cke-saved-href' ] = '#' + ( name || id || '' );

					break;
				case 'email':
					var email = data.email,
						address = email.address,
						linkHref;

					switch ( emailProtection ) {
						case '':
						case 'encode':
							var subject = encodeURIComponent( email.subject || '' ),
								body = encodeURIComponent( email.body || '' ),
								argList = [];

							// Build the e-mail parameters first.
							subject && argList.push( 'subject=' + subject );
							body && argList.push( 'body=' + body );
							argList = argList.length ? '?' + argList.join( '&' ) : '';

							if ( emailProtection == 'encode' ) {
								linkHref = [
									'javascript:void(location.href=\'mailto:\'+', // jshint ignore:line
									protectEmailAddressAsEncodedString( address )
								];
								// parameters are optional.
								argList && linkHref.push( '+\'', escapeSingleQuote( argList ), '\'' );

								linkHref.push( ')' );
							} else {
								linkHref = [ 'mailto:', address, argList ];
							}

							break;
						default:
							// Separating name and domain.
							var nameAndDomain = address.split( '@', 2 );
							email.name = nameAndDomain[ 0 ];
							email.domain = nameAndDomain[ 1 ];

							linkHref = [ 'javascript:', protectEmailLinkAsFunction( editor, email ) ]; // jshint ignore:line
					}

					set[ 'data-cke-saved-href' ] = linkHref.join( '' );
					break;
				case 'tel':
					set[ 'data-cke-saved-href' ] = 'tel:' + data.tel;
					break;
			}

			// Popups and target.
			if ( data.target ) {
				if ( data.target.type == 'popup' ) {
					var onclickList = [
							'window.open(this.href, \'', data.target.name || '', '\', \''
						],
						featureList = [
							'resizable', 'status', 'location', 'toolbar', 'menubar', 'fullscreen', 'scrollbars', 'dependent'
						],
						featureLength = featureList.length,
						addFeature = function( featureName ) {
							if ( data.target[ featureName ] )
								featureList.push( featureName + '=' + data.target[ featureName ] );
						};

					for ( var i = 0; i < featureLength; i++ )
						featureList[ i ] = featureList[ i ] + ( data.target[ featureList[ i ] ] ? '=yes' : '=no' );

					addFeature( 'width' );
					addFeature( 'left' );
					addFeature( 'height' );
					addFeature( 'top' );

					onclickList.push( featureList.join( ',' ), '\'); return false;' );
					set[ 'data-cke-pa-onclick' ] = onclickList.join( '' );
				}
				else if ( data.target.type != 'notSet' && data.target.name ) {
					set.target = data.target.name;
				}
			}

			// Force download attribute.
			if ( data.download ) {
				set.download = '';
			}

			// Advanced attributes.
			if ( data.advanced ) {
				for ( var a in advAttrNames ) {
					var val = data.advanced[ advAttrNames[ a ] ];

					if ( val )
						set[ a ] = val;
				}

				if ( set.name )
					set[ 'data-cke-saved-name' ] = set.name;
			}

			// Browser need the "href" fro copy/paste link to work. (https://dev.ckeditor.com/ticket/6641)
			if ( set[ 'data-cke-saved-href' ] )
				set.href = set[ 'data-cke-saved-href' ];

			var removed = {
				target: 1,
				onclick: 1,
				'data-cke-pa-onclick': 1,
				'data-cke-saved-name': 1,
				'download': 1
			};

			if ( data.advanced )
				CKEDITOR.tools.extend( removed, advAttrNames );

			// Remove all attributes which are not currently set.
			for ( var s in set )
				delete removed[ s ];

			return {
				set: set,
				removed: CKEDITOR.tools.object.keys( removed )
			};
		},


		/**
		 * Determines whether an element should have a "Display Text" field in the Link dialog.
		 *
		 * @since 4.5.11
		 * @param {CKEDITOR.dom.element/null} element Selected element, `null` if none selected or if a ranged selection
		 * is made.
		 * @param {CKEDITOR.editor} editor The editor instance for which the check is performed.
		 * @returns {Boolean}
		 */
		showDisplayTextForElement: function( element, editor ) {
			var undesiredElements = {
					img: 1,
					table: 1,
					tbody: 1,
					thead: 1,
					tfoot: 1,
					input: 1,
					select: 1,
					textarea: 1
				},
				selection = editor.getSelection();

			// Widget duck typing, we don't want to show display text for widgets.
			if ( editor.widgets && editor.widgets.focused ) {
				return false;
			}

			if ( selection && selection.getRanges().length > 1 ) {
				return false;
			}

			return !element || !element.getName || !element.is( undesiredElements );
		}
	};

	// TODO Much probably there's no need to expose these as public objects.

	CKEDITOR.unlinkCommand = function() {};
	CKEDITOR.unlinkCommand.prototype = {
		exec: function( editor ) {
			// IE/Edge removes link from selection while executing "unlink" command when cursor
			// is right before/after link's text. Therefore whole link must be selected and the
			// position of cursor must be restored to its initial state after unlinking. (https://dev.ckeditor.com/ticket/13062)
			if ( CKEDITOR.env.ie ) {
				var range = editor.getSelection().getRanges()[ 0 ],
					link = ( range.getPreviousEditableNode() && range.getPreviousEditableNode().getAscendant( 'a', true ) ) ||
							( range.getNextEditableNode() && range.getNextEditableNode().getAscendant( 'a', true ) ),
					bookmark;

				if ( range.collapsed && link ) {
					bookmark = range.createBookmark();
					range.selectNodeContents( link );
					range.select();
				}
			}

			var style = new CKEDITOR.style( { element: 'a', type: CKEDITOR.STYLE_INLINE, alwaysRemoveElement: 1 } );
			editor.removeStyle( style );

			if ( bookmark ) {
				range.moveToBookmark( bookmark );
				range.select();
			}
		},

		refresh: function( editor, path ) {
			// Despite our initial hope, document.queryCommandEnabled() does not work
			// for this in Firefox. So we must detect the state by element paths.

			var element = path.lastElement && path.lastElement.getAscendant( 'a', true );

			if ( element && element.getName() == 'a' && element.getAttribute( 'href' ) && element.getChildCount() )
				this.setState( CKEDITOR.TRISTATE_OFF );
			else
				this.setState( CKEDITOR.TRISTATE_DISABLED );
		},

		contextSensitive: 1,
		startDisabled: 1,
		requiredContent: 'a[href]',
		editorFocus: 1
	};

	CKEDITOR.removeAnchorCommand = function() {};
	CKEDITOR.removeAnchorCommand.prototype = {
		exec: function( editor ) {
			var sel = editor.getSelection(),
				bms = sel.createBookmarks(),
				anchor;
			if ( sel && ( anchor = sel.getSelectedElement() ) && ( !anchor.getChildCount() ? CKEDITOR.plugins.link.tryRestoreFakeAnchor( editor, anchor ) : anchor.is( 'a' ) ) )
				anchor.remove( 1 );
			else {
				if ( ( anchor = CKEDITOR.plugins.link.getSelectedLink( editor ) ) ) {
					if ( anchor.hasAttribute( 'href' ) ) {
						anchor.removeAttributes( { name: 1, 'data-cke-saved-name': 1 } );
						anchor.removeClass( 'cke_anchor' );
					} else {
						anchor.remove( 1 );
					}
				}
			}
			sel.selectBookmarks( bms );
		},
		requiredContent: 'a[name]'
	};

	CKEDITOR.tools.extend( CKEDITOR.config, {
		/**
		 * Whether to show the Advanced tab in the Link dialog window.
		 *
		 * @cfg {Boolean} [linkShowAdvancedTab=true]
		 * @member CKEDITOR.config
		 */
		linkShowAdvancedTab: true,

		/**
		 * Whether to show the Target tab in the Link dialog window.
		 *
		 * @cfg {Boolean} [linkShowTargetTab=true]
		 * @member CKEDITOR.config
		 */
		linkShowTargetTab: true

		/**
		 * Whether JavaScript code is allowed as a `href` attribute in an anchor tag.
		 * With this option enabled it is possible to create links like:
		 *
		 *		<a href="javascript:alert('Hello world!')">hello world</a>
		 *
		 * By default JavaScript links are not allowed and will not pass
		 * the Link dialog window validation.
		 *
		 * @since 4.4.1
		 * @cfg {Boolean} [linkJavaScriptLinksAllowed=false]
		 * @member CKEDITOR.config
		 */

		/**
		 * Optional JavaScript regular expression used whenever phone numbers in the Link dialog should be validated.
		 *
		 *		config.linkPhoneRegExp = /^[0-9]{9}$/;
		 *
		 * @since 4.11.0
		 * @cfg {RegExp} [linkPhoneRegExp]
		 * @member CKEDITOR.config
		 */

		/**
		 * Optional message for the alert popup used when the phone number in the Link dialog does not pass the validation.
		 *
		 *		config.linkPhoneMsg = "Invalid number";
		 *
		 * @since 4.11.0
		 * @cfg {String} [linkPhoneMsg]
		 * @member CKEDITOR.config
		 */
	} );
} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Insert and remove numbered and bulleted lists.
 */

( function() {
	var listNodeNames = { ol: 1, ul: 1 };

	var whitespaces = CKEDITOR.dom.walker.whitespaces(),
		bookmarks = CKEDITOR.dom.walker.bookmark(),
		nonEmpty = function( node ) {
			return !( whitespaces( node ) || bookmarks( node ) );
		},
		blockBogus = CKEDITOR.dom.walker.bogus();

	function cleanUpDirection( element ) {
		var dir, parent, parentDir;
		if ( ( dir = element.getDirection() ) ) {
			parent = element.getParent();
			while ( parent && !( parentDir = parent.getDirection() ) )
				parent = parent.getParent();

			if ( dir == parentDir )
				element.removeAttribute( 'dir' );
		}
	}

	// Inherit inline styles from another element.
	function inheritInlineStyles( parent, el ) {
		var style = parent.getAttribute( 'style' );

		// Put parent styles before child styles.
		style && el.setAttribute( 'style', style.replace( /([^;])$/, '$1;' ) + ( el.getAttribute( 'style' ) || '' ) );
	}

	CKEDITOR.plugins.list = {
		/**
		 * Convert a DOM list tree into a data structure that is easier to
		 * manipulate. This operation should be non-intrusive in the sense that it
		 * does not change the DOM tree, with the exception that it may add some
		 * markers to the list item nodes when database is specified.
		 *
		 * @member CKEDITOR.plugins.list
		 * @todo params
		 */
		listToArray: function( listNode, database, baseArray, baseIndentLevel, grandparentNode ) {
			if ( !listNodeNames[ listNode.getName() ] )
				return [];

			if ( !baseIndentLevel )
				baseIndentLevel = 0;
			if ( !baseArray )
				baseArray = [];

			// Iterate over all list items to and look for inner lists.
			for ( var i = 0, count = listNode.getChildCount(); i < count; i++ ) {
				var listItem = listNode.getChild( i );

				// Fixing malformed nested lists by moving it into a previous list item. (https://dev.ckeditor.com/ticket/6236)
				if ( listItem.type == CKEDITOR.NODE_ELEMENT && listItem.getName() in CKEDITOR.dtd.$list )
					CKEDITOR.plugins.list.listToArray( listItem, database, baseArray, baseIndentLevel + 1 );

				// It may be a text node or some funny stuff.
				if ( listItem.$.nodeName.toLowerCase() != 'li' )
					continue;

				var itemObj = { 'parent': listNode, indent: baseIndentLevel, element: listItem, contents: [] };
				if ( !grandparentNode ) {
					itemObj.grandparent = listNode.getParent();
					if ( itemObj.grandparent && itemObj.grandparent.$.nodeName.toLowerCase() == 'li' )
						itemObj.grandparent = itemObj.grandparent.getParent();
				} else {
					itemObj.grandparent = grandparentNode;
				}

				if ( database )
					CKEDITOR.dom.element.setMarker( database, listItem, 'listarray_index', baseArray.length );
				baseArray.push( itemObj );

				for ( var j = 0, itemChildCount = listItem.getChildCount(), child; j < itemChildCount; j++ ) {
					child = listItem.getChild( j );
					if ( child.type == CKEDITOR.NODE_ELEMENT && listNodeNames[ child.getName() ] )
					// Note the recursion here, it pushes inner list items with
					// +1 indentation in the correct order.
					CKEDITOR.plugins.list.listToArray( child, database, baseArray, baseIndentLevel + 1, itemObj.grandparent );
					else
						itemObj.contents.push( child );
				}
			}
			return baseArray;
		},

		/**
		 * Convert our internal representation of a list back to a DOM forest.
		 *
		 * @member CKEDITOR.plugins.list
		 * @todo params
		 */
		arrayToList: function( listArray, database, baseIndex, paragraphMode, dir ) {
			if ( !baseIndex )
				baseIndex = 0;
			if ( !listArray || listArray.length < baseIndex + 1 )
				return null;

			var i,
				doc = listArray[ baseIndex ].parent.getDocument(),
				retval = new CKEDITOR.dom.documentFragment( doc ),
				rootNode = null,
				currentIndex = baseIndex,
				indentLevel = Math.max( listArray[ baseIndex ].indent, 0 ),
				currentListItem = null,
				orgDir, block,
				paragraphName = ( paragraphMode == CKEDITOR.ENTER_P ? 'p' : 'div' );

			while ( 1 ) {
				var item = listArray[ currentIndex ],
					itemGrandParent = item.grandparent;

				orgDir = item.element.getDirection( 1 );

				if ( item.indent == indentLevel ) {
					if ( !rootNode || listArray[ currentIndex ].parent.getName() != rootNode.getName() ) {
						rootNode = listArray[ currentIndex ].parent.clone( false, 1 );
						dir && rootNode.setAttribute( 'dir', dir );
						retval.append( rootNode );
					}
					currentListItem = rootNode.append( item.element.clone( 0, 1 ) );

					if ( orgDir != rootNode.getDirection( 1 ) )
						currentListItem.setAttribute( 'dir', orgDir );

					for ( i = 0; i < item.contents.length; i++ )
						currentListItem.append( item.contents[ i ].clone( 1, 1 ) );
					currentIndex++;
				} else if ( item.indent == Math.max( indentLevel, 0 ) + 1 ) {
					// Maintain original direction (https://dev.ckeditor.com/ticket/6861).
					var currDir = listArray[ currentIndex - 1 ].element.getDirection( 1 ),
						listData = CKEDITOR.plugins.list.arrayToList( listArray, null, currentIndex, paragraphMode, currDir != orgDir ? orgDir : null );

					// If the next block is an <li> with another list tree as the first
					// child, we'll need to append a filler (<br>/NBSP) or the list item
					// wouldn't be editable. (https://dev.ckeditor.com/ticket/6724)
					if ( !currentListItem.getChildCount() && CKEDITOR.env.needsNbspFiller && doc.$.documentMode <= 7 )
						currentListItem.append( doc.createText( '\xa0' ) );
					currentListItem.append( listData.listNode );
					currentIndex = listData.nextIndex;
				} else if ( item.indent == -1 && !baseIndex && itemGrandParent ) {
					if ( listNodeNames[ itemGrandParent.getName() ] ) {
						currentListItem = item.element.clone( false, true );
						if ( orgDir != itemGrandParent.getDirection( 1 ) )
							currentListItem.setAttribute( 'dir', orgDir );
					} else {
						currentListItem = new CKEDITOR.dom.documentFragment( doc );
					}

					// Migrate all children to the new container,
					// apply the proper text direction.
					var dirLoose = itemGrandParent.getDirection( 1 ) != orgDir,
						li = item.element,
						className = li.getAttribute( 'class' ),
						style = li.getAttribute( 'style' );

					var needsBlock = currentListItem.type == CKEDITOR.NODE_DOCUMENT_FRAGMENT && ( paragraphMode != CKEDITOR.ENTER_BR || dirLoose || style || className );

					var child,
						count = item.contents.length,
						cachedBookmark;

					for ( i = 0; i < count; i++ ) {
						child = item.contents[ i ];

						// Append bookmark if we can, or cache it and append it when we'll know
						// what to do with it. Generally - we want to keep it next to its original neighbour.
						// Exception: if bookmark is the only child it hasn't got any neighbour, so handle it normally
						// (wrap with block if needed).
						if ( bookmarks( child ) && count > 1 ) {
							// If we don't need block, it's simple - append bookmark directly to the current list item.
							if ( !needsBlock )
								currentListItem.append( child.clone( 1, 1 ) );
							else
								cachedBookmark = child.clone( 1, 1 );
						}
						// Block content goes directly to the current list item, without wrapping.
						else if ( child.type == CKEDITOR.NODE_ELEMENT && child.isBlockBoundary() ) {
							// Apply direction on content blocks.
							if ( dirLoose && !child.getDirection() )
								child.setAttribute( 'dir', orgDir );

							inheritInlineStyles( li, child );

							className && child.addClass( className );

							// Close the block which we started for inline content.
							block = null;
							// Append bookmark directly before current child.
							if ( cachedBookmark ) {
								currentListItem.append( cachedBookmark );
								cachedBookmark = null;
							}
							// Append this block element to the list item.
							currentListItem.append( child.clone( 1, 1 ) );
						}
						// Some inline content was found - wrap it with block and append that
						// block to the current list item or append it to the block previously created.
						else if ( needsBlock ) {
							// Establish new block to hold text direction and styles.
							if ( !block ) {
								block = doc.createElement( paragraphName );
								currentListItem.append( block );
								dirLoose && block.setAttribute( 'dir', orgDir );
							}

							// Copy over styles to new block;
							style && block.setAttribute( 'style', style );
							className && block.setAttribute( 'class', className );

							// Append bookmark directly before current child.
							if ( cachedBookmark ) {
								block.append( cachedBookmark );
								cachedBookmark = null;
							}
							block.append( child.clone( 1, 1 ) );
						}
						// E.g. BR mode - inline content appended directly to the list item.
						else {
							currentListItem.append( child.clone( 1, 1 ) );
						}
					}

					// No content after bookmark - append it to the block if we had one
					// or directly to the current list item if we finished directly in the current list item.
					if ( cachedBookmark ) {
						( block || currentListItem ).append( cachedBookmark );
						cachedBookmark = null;
					}

					if ( currentListItem.type == CKEDITOR.NODE_DOCUMENT_FRAGMENT && currentIndex != listArray.length - 1 ) {
						var last;

						// Remove bogus <br> if this browser uses them.
						if ( CKEDITOR.env.needsBrFiller ) {
							last = currentListItem.getLast();
							if ( last && last.type == CKEDITOR.NODE_ELEMENT && last.is( 'br' ) )
								last.remove();
						}

						// If the last element is not a block, append <br> to separate merged list items.
						last = currentListItem.getLast( nonEmpty );
						if ( !( last && last.type == CKEDITOR.NODE_ELEMENT && last.is( CKEDITOR.dtd.$block ) ) )
							currentListItem.append( doc.createElement( 'br' ) );
					}

					var currentListItemName = currentListItem.$.nodeName.toLowerCase();
					if ( currentListItemName == 'div' || currentListItemName == 'p' ) {
						currentListItem.appendBogus();
					}
					retval.append( currentListItem );
					rootNode = null;
					currentIndex++;
				} else {
					return null;
				}

				block = null;

				if ( listArray.length <= currentIndex || Math.max( listArray[ currentIndex ].indent, 0 ) < indentLevel )
					break;
			}

			if ( database ) {
				var currentNode = retval.getFirst();

				while ( currentNode ) {
					if ( currentNode.type == CKEDITOR.NODE_ELEMENT ) {
						// Clear marker attributes for the new list tree made of cloned nodes, if any.
						CKEDITOR.dom.element.clearMarkers( database, currentNode );

						// Clear redundant direction attribute specified on list items.
						if ( currentNode.getName() in CKEDITOR.dtd.$listItem )
							cleanUpDirection( currentNode );
					}

					currentNode = currentNode.getNextSourceNode();
				}
			}

			return { listNode: retval, nextIndex: currentIndex };
		}
	};

	function changeListType( editor, groupObj, database, listsCreated ) {
		// This case is easy...
		// 1. Convert the whole list into a one-dimensional array.
		// 2. Change the list type by modifying the array.
		// 3. Recreate the whole list by converting the array to a list.
		// 4. Replace the original list with the recreated list.
		var listArray = CKEDITOR.plugins.list.listToArray( groupObj.root, database ),
			selectedListItems = [];

		for ( var i = 0; i < groupObj.contents.length; i++ ) {
			var itemNode = groupObj.contents[ i ];
			itemNode = itemNode.getAscendant( 'li', true );
			if ( !itemNode || itemNode.getCustomData( 'list_item_processed' ) )
				continue;
			selectedListItems.push( itemNode );
			CKEDITOR.dom.element.setMarker( database, itemNode, 'list_item_processed', true );
		}

		var root = groupObj.root,
			doc = root.getDocument(),
			listNode, newListNode;

		for ( i = 0; i < selectedListItems.length; i++ ) {
			var listIndex = selectedListItems[ i ].getCustomData( 'listarray_index' );
			listNode = listArray[ listIndex ].parent;

			// Switch to new list node for this particular item.
			if ( !listNode.is( this.type ) ) {
				newListNode = doc.createElement( this.type );
				// Copy all attributes, except from 'start' and 'type'.
				listNode.copyAttributes( newListNode, { start: 1, type: 1 } );
				// The list-style-type property should be ignored.
				newListNode.removeStyle( 'list-style-type' );
				listArray[ listIndex ].parent = newListNode;
			}
		}

		var newList = CKEDITOR.plugins.list.arrayToList( listArray, database, null, editor.config.enterMode );
		var child,
			length = newList.listNode.getChildCount();
		for ( i = 0; i < length && ( child = newList.listNode.getChild( i ) ); i++ ) {
			if ( child.getName() == this.type )
				listsCreated.push( child );
		}
		newList.listNode.replace( groupObj.root );

		editor.fire( 'contentDomInvalidated' );
	}

	function createList( editor, groupObj, listsCreated ) {
		var contents = groupObj.contents,
			doc = groupObj.root.getDocument(),
			listContents = [];

		// It is possible to have the contents returned by DomRangeIterator to be the same as the root.
		// e.g. when we're running into table cells.
		// In such a case, enclose the childNodes of contents[0] into a <div>.
		if ( contents.length == 1 && contents[ 0 ].equals( groupObj.root ) ) {
			var divBlock = doc.createElement( 'div' );
			contents[ 0 ].moveChildren && contents[ 0 ].moveChildren( divBlock );
			contents[ 0 ].append( divBlock );
			contents[ 0 ] = divBlock;
		}

		// Calculate the common parent node of all content blocks.
		var commonParent = groupObj.contents[ 0 ].getParent();
		for ( var i = 0; i < contents.length; i++ )
			commonParent = commonParent.getCommonAncestor( contents[ i ].getParent() );

		var useComputedState = editor.config.useComputedState,
			listDir, explicitDirection;

		useComputedState = useComputedState === undefined || useComputedState;

		// We want to insert things that are in the same tree level only, so calculate the contents again
		// by expanding the selected blocks to the same tree level.
		for ( i = 0; i < contents.length; i++ ) {
			var contentNode = contents[ i ],
				parentNode;
			while ( ( parentNode = contentNode.getParent() ) ) {
				if ( parentNode.equals( commonParent ) ) {
					listContents.push( contentNode );

					// Determine the lists's direction.
					if ( !explicitDirection && contentNode.getDirection() )
						explicitDirection = 1;

					var itemDir = contentNode.getDirection( useComputedState );

					if ( listDir !== null ) {
						// If at least one LI have a different direction than current listDir, we can't have listDir.
						if ( listDir && listDir != itemDir )
							listDir = null;
						else
							listDir = itemDir;
					}

					break;
				}
				contentNode = parentNode;
			}
		}

		if ( listContents.length < 1 )
			return;

		// Insert the list to the DOM tree.
		var insertAnchor = listContents[ listContents.length - 1 ].getNext(),
			listNode = doc.createElement( this.type );

		listsCreated.push( listNode );

		var contentBlock, listItem;

		while ( listContents.length ) {
			contentBlock = listContents.shift();
			listItem = doc.createElement( 'li' );

			// If current block should be preserved, append it to list item instead of
			// transforming it to <li> element.
			if ( shouldPreserveBlock( contentBlock ) )
				contentBlock.appendTo( listItem );
			else {
				contentBlock.copyAttributes( listItem );
				// Remove direction attribute after it was merged into list root. (https://dev.ckeditor.com/ticket/7657)
				if ( listDir && contentBlock.getDirection() ) {
					listItem.removeStyle( 'direction' );
					listItem.removeAttribute( 'dir' );
				}
				contentBlock.moveChildren( listItem );
				contentBlock.remove();
			}

			listItem.appendTo( listNode );
		}

		// Apply list root dir only if it has been explicitly declared.
		if ( listDir && explicitDirection )
			listNode.setAttribute( 'dir', listDir );

		if ( insertAnchor )
			listNode.insertBefore( insertAnchor );
		else
			listNode.appendTo( commonParent );
	}

	function removeList( editor, groupObj, database ) {
		// This is very much like the change list type operation.
		// Except that we're changing the selected items' indent to -1 in the list array.
		var listArray = CKEDITOR.plugins.list.listToArray( groupObj.root, database ),
			selectedListItems = [];

		for ( var i = 0; i < groupObj.contents.length; i++ ) {
			var itemNode = groupObj.contents[ i ];
			itemNode = itemNode.getAscendant( 'li', true );
			if ( !itemNode || itemNode.getCustomData( 'list_item_processed' ) )
				continue;
			selectedListItems.push( itemNode );
			CKEDITOR.dom.element.setMarker( database, itemNode, 'list_item_processed', true );
		}

		var lastListIndex = null;
		for ( i = 0; i < selectedListItems.length; i++ ) {
			var listIndex = selectedListItems[ i ].getCustomData( 'listarray_index' );
			listArray[ listIndex ].indent = -1;
			lastListIndex = listIndex;
		}

		// After cutting parts of the list out with indent=-1, we still have to maintain the array list
		// model's nextItem.indent <= currentItem.indent + 1 invariant. Otherwise the array model of the
		// list cannot be converted back to a real DOM list.
		for ( i = lastListIndex + 1; i < listArray.length; i++ ) {
			if ( listArray[ i ].indent > listArray[ i - 1 ].indent + 1 ) {
				var indentOffset = listArray[ i - 1 ].indent + 1 - listArray[ i ].indent;
				var oldIndent = listArray[ i ].indent;
				while ( listArray[ i ] && listArray[ i ].indent >= oldIndent ) {
					listArray[ i ].indent += indentOffset;
					i++;
				}
				i--;
			}
		}

		var newList = CKEDITOR.plugins.list.arrayToList( listArray, database, null, editor.config.enterMode, groupObj.root.getAttribute( 'dir' ) );

		// Compensate <br> before/after the list node if the surrounds are non-blocks.(https://dev.ckeditor.com/ticket/3836)
		var docFragment = newList.listNode,
			boundaryNode, siblingNode;

		function compensateBrs( isStart ) {
			if (
				( boundaryNode = docFragment[ isStart ? 'getFirst' : 'getLast' ]() ) &&
				!( boundaryNode.is && boundaryNode.isBlockBoundary() ) &&
				( siblingNode = groupObj.root[ isStart ? 'getPrevious' : 'getNext' ]( CKEDITOR.dom.walker.invisible( true ) ) ) &&
				!( siblingNode.is && siblingNode.isBlockBoundary( { br: 1 } ) )
			) {
				editor.document.createElement( 'br' )[ isStart ? 'insertBefore' : 'insertAfter' ]( boundaryNode );
			}
		}
		compensateBrs( true );
		compensateBrs();

		docFragment.replace( groupObj.root );

		editor.fire( 'contentDomInvalidated' );
	}

	var headerTagRegex = /^h[1-6]$/;

	// Checks wheather this block should be element preserved (not transformed to <li>) when creating list.
	function shouldPreserveBlock( block ) {
		return (
			// https://dev.ckeditor.com/ticket/5335
			block.is( 'pre' ) ||
			// https://dev.ckeditor.com/ticket/5271 - this is a header.
			headerTagRegex.test( block.getName() ) ||
			// 11083 - this is a non-editable element.
			block.getAttribute( 'contenteditable' ) == 'false'
		);
	}

	function listCommand( name, type ) {
		this.name = name;
		this.type = type;
		this.context = type;
		this.allowedContent = type + ' li';
		this.requiredContent = type;
	}

	var elementType = CKEDITOR.dom.walker.nodeType( CKEDITOR.NODE_ELEMENT );

	// Merge child nodes with direction preserved. (https://dev.ckeditor.com/ticket/7448)
	function mergeChildren( from, into, refNode, forward ) {
		var child, itemDir;
		while ( ( child = from[ forward ? 'getLast' : 'getFirst' ]( elementType ) ) ) {
			if ( ( itemDir = child.getDirection( 1 ) ) !== into.getDirection( 1 ) )
				child.setAttribute( 'dir', itemDir );

			child.remove();

			refNode ? child[ forward ? 'insertBefore' : 'insertAfter' ]( refNode ) : into.append( child, forward );
			refNode = child;
		}
	}

	listCommand.prototype = {
		exec: function( editor ) {
			// Run state check first of all.
			this.refresh( editor, editor.elementPath() );

			var config = editor.config,
				selection = editor.getSelection(),
				ranges = selection && selection.getRanges();

			// Midas lists rule #1 says we can create a list even in an empty document.
			// But DOM iterator wouldn't run if the document is really empty.
			// So create a paragraph if the document is empty and we're going to create a list.
			if ( this.state == CKEDITOR.TRISTATE_OFF ) {
				var editable = editor.editable();
				if ( !editable.getFirst( nonEmpty ) ) {
					config.enterMode == CKEDITOR.ENTER_BR ? editable.appendBogus() : ranges[ 0 ].fixBlock( 1, config.enterMode == CKEDITOR.ENTER_P ? 'p' : 'div' );

					selection.selectRanges( ranges );
				}
				// Maybe a single range there enclosing the whole list,
				// turn on the list state manually(https://dev.ckeditor.com/ticket/4129).
				else {
					var range = ranges.length == 1 && ranges[ 0 ],
						enclosedNode = range && range.getEnclosedNode();
					if ( enclosedNode && enclosedNode.is && this.type == enclosedNode.getName() )
						this.setState( CKEDITOR.TRISTATE_ON );
				}
			}

			var bookmarks = selection.createBookmarks( true );

			// Group the blocks up because there are many cases where multiple lists have to be created,
			// or multiple lists have to be cancelled.
			var listGroups = [],
				database = {},
				rangeIterator = ranges.createIterator(),
				index = 0;

			while ( ( range = rangeIterator.getNextRange() ) && ++index ) {
				var boundaryNodes = range.getBoundaryNodes(),
					startNode = boundaryNodes.startNode,
					endNode = boundaryNodes.endNode;

				if ( startNode.type == CKEDITOR.NODE_ELEMENT && startNode.getName() == 'td' )
					range.setStartAt( boundaryNodes.startNode, CKEDITOR.POSITION_AFTER_START );

				if ( endNode.type == CKEDITOR.NODE_ELEMENT && endNode.getName() == 'td' )
					range.setEndAt( boundaryNodes.endNode, CKEDITOR.POSITION_BEFORE_END );

				var iterator = range.createIterator(),
					block;

				iterator.forceBrBreak = ( this.state == CKEDITOR.TRISTATE_OFF );

				while ( ( block = iterator.getNextParagraph() ) ) {
					// Avoid duplicate blocks get processed across ranges.
					// Avoid processing comments, we don't want to touch it.
					if ( block.getCustomData( 'list_block' ) || hasCommentsChildOnly( block ) )
						continue;
					else
						CKEDITOR.dom.element.setMarker( database, block, 'list_block', 1 );

					var path = editor.elementPath( block ),
						pathElements = path.elements,
						pathElementsCount = pathElements.length,
						processedFlag = 0,
						blockLimit = path.blockLimit,
						element;

					// First, try to group by a list ancestor.
					for ( var i = pathElementsCount - 1; i >= 0 && ( element = pathElements[ i ] ); i-- ) {
						// Don't leak outside block limit (https://dev.ckeditor.com/ticket/3940).
						if ( listNodeNames[ element.getName() ] && blockLimit.contains( element ) ) {
							// If we've encountered a list inside a block limit
							// The last group object of the block limit element should
							// no longer be valid. Since paragraphs after the list
							// should belong to a different group of paragraphs before
							// the list. (Bug https://dev.ckeditor.com/ticket/1309)
							blockLimit.removeCustomData( 'list_group_object_' + index );

							var groupObj = element.getCustomData( 'list_group_object' );
							if ( groupObj )
								groupObj.contents.push( block );
							else {
								groupObj = { root: element, contents: [ block ] };
								listGroups.push( groupObj );
								CKEDITOR.dom.element.setMarker( database, element, 'list_group_object', groupObj );
							}
							processedFlag = 1;
							break;
						}
					}

					if ( processedFlag )
						continue;

					// No list ancestor? Group by block limit, but don't mix contents from different ranges.
					var root = blockLimit;
					if ( root.getCustomData( 'list_group_object_' + index ) )
						root.getCustomData( 'list_group_object_' + index ).contents.push( block );
					else {
						groupObj = { root: root, contents: [ block ] };
						CKEDITOR.dom.element.setMarker( database, root, 'list_group_object_' + index, groupObj );
						listGroups.push( groupObj );
					}
				}
			}

			// Now we have two kinds of list groups, groups rooted at a list, and groups rooted at a block limit element.
			// We either have to build lists or remove lists, for removing a list does not makes sense when we are looking
			// at the group that's not rooted at lists. So we have three cases to handle.
			var listsCreated = [];
			while ( listGroups.length > 0 ) {
				groupObj = listGroups.shift();
				if ( this.state == CKEDITOR.TRISTATE_OFF ) {
					if ( isEmptyList( groupObj ) ) {
						continue;
					} else if ( listNodeNames[ groupObj.root.getName() ] ) {
						changeListType.call( this, editor, groupObj, database, listsCreated );
					} else {
						createList.call( this, editor, groupObj, listsCreated );
					}
				} else if ( this.state == CKEDITOR.TRISTATE_ON && listNodeNames[ groupObj.root.getName() ] && !isEmptyList( groupObj ) ) {
					removeList.call( this, editor, groupObj, database );
				}
			}

			// For all new lists created, merge into adjacent, same type lists.
			for ( i = 0; i < listsCreated.length; i++ )
				mergeListSiblings( listsCreated[ i ] );

			// Clean up, restore selection and update toolbar button states.
			CKEDITOR.dom.element.clearAllMarkers( database );
			selection.selectBookmarks( bookmarks );
			editor.focus();

			function isEmptyList( groupObj ) {
				// If list is without any li item, then ignore such element from transformation, because it throws errors in console (#2411, #2438).
				return listNodeNames[ groupObj.root.getName() ] && !getChildCount( groupObj.root, [ CKEDITOR.NODE_COMMENT ] );
			}

			function getChildCount( element, excludeTypes ) {
				return CKEDITOR.tools.array.filter( element.getChildren().toArray(), function( node ) {
					return CKEDITOR.tools.array.indexOf( excludeTypes, node.type ) === -1;
				} ).length;
			}

			function hasCommentsChildOnly( element ) {
				var ret = true;
				if ( element.getChildCount() === 0 ) {
					return false;
				}
				element.forEach( function( node ) {
					if ( node.type !== CKEDITOR.NODE_COMMENT ) {
						ret = false;
						return false;
					}
				}, null, true );
				return ret;
			}
		},

		refresh: function( editor, path ) {
			var list = path.contains( listNodeNames, 1 ),
				limit = path.blockLimit || path.root;

			// 1. Only a single type of list activate.
			// 2. Do not show list outside of block limit.
			if ( list && limit.contains( list ) )
				this.setState( list.is( this.type ) ? CKEDITOR.TRISTATE_ON : CKEDITOR.TRISTATE_OFF );
			else
				this.setState( CKEDITOR.TRISTATE_OFF );
		}
	};

	// Merge list adjacent, of same type lists.
	function mergeListSiblings( listNode ) {

		function mergeSibling( rtl ) {
			var sibling = listNode[ rtl ? 'getPrevious' : 'getNext' ]( nonEmpty );
			if ( sibling && sibling.type == CKEDITOR.NODE_ELEMENT && sibling.is( listNode.getName() ) ) {
				// Move children order by merge direction.(https://dev.ckeditor.com/ticket/3820)
				mergeChildren( listNode, sibling, null, !rtl );

				listNode.remove();
				listNode = sibling;
			}
		}

		mergeSibling();
		mergeSibling( 1 );
	}

	// Check if node is block element that recieves text.
	function isTextBlock( node ) {
		return node.type == CKEDITOR.NODE_ELEMENT && ( node.getName() in CKEDITOR.dtd.$block || node.getName() in CKEDITOR.dtd.$listItem ) && CKEDITOR.dtd[ node.getName() ][ '#' ];
	}

	// Join visually two block lines.
	function joinNextLineToCursor( editor, cursor, nextCursor ) {
		editor.fire( 'saveSnapshot' );

		// Merge with previous block's content.
		nextCursor.enlarge( CKEDITOR.ENLARGE_LIST_ITEM_CONTENTS );
		var frag = nextCursor.extractContents();

		cursor.trim( false, true );
		var bm = cursor.createBookmark();

		// Kill original bogus;
		var currentPath = new CKEDITOR.dom.elementPath( cursor.startContainer ),
				pathBlock = currentPath.block,
				currentBlock = currentPath.lastElement.getAscendant( 'li', 1 ) || pathBlock,
				nextPath = new CKEDITOR.dom.elementPath( nextCursor.startContainer ),
				nextLi = nextPath.contains( CKEDITOR.dtd.$listItem ),
				nextList = nextPath.contains( CKEDITOR.dtd.$list ),
				last;

		// Remove bogus node the current block/pseudo block.
		if ( pathBlock ) {
			var bogus = pathBlock.getBogus();
			bogus && bogus.remove();
		}
		else if ( nextList ) {
			last = nextList.getPrevious( nonEmpty );
			if ( last && blockBogus( last ) )
				last.remove();
		}

		// Kill the tail br in extracted.
		last = frag.getLast();
		if ( last && last.type == CKEDITOR.NODE_ELEMENT && last.is( 'br' ) )
			last.remove();

		// Insert fragment at the range position.
		var nextNode = cursor.startContainer.getChild( cursor.startOffset );
		if ( nextNode )
			frag.insertBefore( nextNode );
		else
			cursor.startContainer.append( frag );

		// Move the sub list nested in the next list item.
		if ( nextLi ) {
			var sublist = getSubList( nextLi );
			if ( sublist ) {
				// If next line is in the sub list of the current list item.
				if ( currentBlock.contains( nextLi ) ) {
					mergeChildren( sublist, nextLi.getParent(), nextLi );
					sublist.remove();
				}
				// Migrate the sub list to current list item.
				else {
					currentBlock.append( sublist );
				}
			}
		}

		var nextBlock, parent;
		// Remove any remaining zombies path blocks at the end after line merged.
		while ( nextCursor.checkStartOfBlock() && nextCursor.checkEndOfBlock() ) {
			nextPath = nextCursor.startPath();
			nextBlock = nextPath.block;

			// Abort when nothing to be removed (https://dev.ckeditor.com/ticket/10890).
			if ( !nextBlock )
				break;

			// Check if also to remove empty list.
			if ( nextBlock.is( 'li' ) ) {
				parent = nextBlock.getParent();
				if ( nextBlock.equals( parent.getLast( nonEmpty ) ) && nextBlock.equals( parent.getFirst( nonEmpty ) ) )
					nextBlock = parent;
			}

			nextCursor.moveToPosition( nextBlock, CKEDITOR.POSITION_BEFORE_START );
			nextBlock.remove();
		}

		// Check if need to further merge with the list resides after the merged block. (https://dev.ckeditor.com/ticket/9080)
		var walkerRng = nextCursor.clone(), editable = editor.editable();
		walkerRng.setEndAt( editable, CKEDITOR.POSITION_BEFORE_END );
		var walker = new CKEDITOR.dom.walker( walkerRng );
		walker.evaluator = function( node ) {
			return nonEmpty( node ) && !blockBogus( node );
		};
		var next = walker.next();
		if ( next && next.type == CKEDITOR.NODE_ELEMENT && next.getName() in CKEDITOR.dtd.$list )
			mergeListSiblings( next );

		cursor.moveToBookmark( bm );

		// Make fresh selection.
		cursor.select();

		editor.fire( 'saveSnapshot' );
	}

	function getSubList( li ) {
		var last = li.getLast( nonEmpty );
		return last && last.type == CKEDITOR.NODE_ELEMENT && last.getName() in listNodeNames ? last : null;
	}

	CKEDITOR.plugins.add( 'list', {
		// jscs:disable maximumLineLength
		// jscs:enable maximumLineLength
		requires: 'indentlist',
		init: function( editor ) {
			if ( editor.blockless )
				return;

			// Register commands.
			editor.addCommand( 'numberedlist', new listCommand( 'numberedlist', 'ol' ) );
			editor.addCommand( 'bulletedlist', new listCommand( 'bulletedlist', 'ul' ) );

			// Register the toolbar button.
			if ( editor.ui.addButton ) {
				editor.ui.addButton( 'NumberedList', {
					label: editor.lang.list.numberedlist,
					command: 'numberedlist',
					directional: true,
					toolbar: 'list,10'
				} );
				editor.ui.addButton( 'BulletedList', {
					label: editor.lang.list.bulletedlist,
					command: 'bulletedlist',
					directional: true,
					toolbar: 'list,20'
				} );
			}

			// Handled backspace/del key to join list items. (https://dev.ckeditor.com/ticket/8248,https://dev.ckeditor.com/ticket/9080)
			editor.on( 'key', function( evt ) {
				// Use getKey directly in order to ignore modifiers.
				// Justification: https://dev.ckeditor.com/ticket/11861#comment:13
				var key = evt.data.domEvent.getKey(), li;

				// DEl/BACKSPACE
				if ( editor.mode == 'wysiwyg' && key in { 8: 1, 46: 1 } ) {
					var sel = editor.getSelection(),
						range = sel.getRanges()[ 0 ],
						path = range && range.startPath();

					if ( !range || !range.collapsed )
						return;

					var isBackspace = key == 8;
					var editable = editor.editable();
					var walker = new CKEDITOR.dom.walker( range.clone() );
					walker.evaluator = function( node ) {
						return nonEmpty( node ) && !blockBogus( node );
					};
					// Backspace/Del behavior at the start/end of table is handled in core.
					walker.guard = function( node, isOut ) {
						return !( isOut && node.type == CKEDITOR.NODE_ELEMENT && node.is( 'table' ) );
					};

					var cursor = range.clone();

					if ( isBackspace ) {
						var previous, joinWith;

						// Join a sub list's first line, with the previous visual line in parent.
						if (
							( previous = path.contains( listNodeNames ) ) &&
							range.checkBoundaryOfElement( previous, CKEDITOR.START ) &&
							( previous = previous.getParent() ) && previous.is( 'li' ) &&
							( previous = getSubList( previous ) )
						) {
							joinWith = previous;
							previous = previous.getPrevious( nonEmpty );
							// Place cursor before the nested list.
							cursor.moveToPosition(
								previous && blockBogus( previous ) ? previous : joinWith,
								CKEDITOR.POSITION_BEFORE_START );
						}
						// Join any line following a list, with the last visual line of the list.
						else {
							walker.range.setStartAt( editable, CKEDITOR.POSITION_AFTER_START );
							walker.range.setEnd( range.startContainer, range.startOffset );

							previous = walker.previous();

							if (
								previous && previous.type == CKEDITOR.NODE_ELEMENT &&
								( previous.getName() in listNodeNames ||
								previous.is( 'li' ) )
							) {
								if ( !previous.is( 'li' ) ) {
									walker.range.selectNodeContents( previous );
									walker.reset();
									walker.evaluator = isTextBlock;
									previous = walker.previous();
								}

								joinWith = previous;
								// Place cursor at the end of previous block.
								cursor.moveToElementEditEnd( joinWith );

								// And then just before end of closest block element (https://dev.ckeditor.com/ticket/12729).
								cursor.moveToPosition( cursor.endPath().block, CKEDITOR.POSITION_BEFORE_END );
							}
						}

						if ( joinWith ) {
							joinNextLineToCursor( editor, cursor, range );
							evt.cancel();
						}
						else {
							var list = path.contains( listNodeNames );
							// Backspace pressed at the start of list outdents the first list item. (https://dev.ckeditor.com/ticket/9129)
							if ( list && range.checkBoundaryOfElement( list, CKEDITOR.START ) ) {
								li = list.getFirst( nonEmpty );

								if ( range.checkBoundaryOfElement( li, CKEDITOR.START ) ) {
									previous = list.getPrevious( nonEmpty );

									// Only if the list item contains a sub list, do nothing but
									// simply move cursor backward one character.
									if ( getSubList( li ) ) {
										if ( previous ) {
											range.moveToElementEditEnd( previous );
											range.select();
										}

										evt.cancel();
									}
									else {
										editor.execCommand( 'outdent' );
										evt.cancel();
									}
								}
							}
						}

					} else {
						var next, nextLine;

						li = path.contains( 'li' );

						if ( li ) {
							walker.range.setEndAt( editable, CKEDITOR.POSITION_BEFORE_END );

							var last = li.getLast( nonEmpty );
							var block = last && isTextBlock( last ) ? last : li;

							// Indicate cursor at the visual end of an list item.
							var isAtEnd = 0;

							next = walker.next();

							// When list item contains a sub list.
							if (
								next && next.type == CKEDITOR.NODE_ELEMENT &&
								next.getName() in listNodeNames &&
								next.equals( last )
							) {
								isAtEnd = 1;

								// Move to the first item in sub list.
								next = walker.next();
							}
							// Right at the end of list item.
							else if ( range.checkBoundaryOfElement( block, CKEDITOR.END ) ) {
								isAtEnd = 2;
							}

							if ( isAtEnd && next ) {
								// Put cursor range there.
								nextLine = range.clone();
								nextLine.moveToElementEditStart( next );

								// https://dev.ckeditor.com/ticket/13409
								// For the following case and similar
								//
								// <ul>
								// 	<li>
								// 		<p><a href="#one"><em>x^</em></a></p>
								// 		<ul>
								// 			<li><span>y</span></li>
								// 		</ul>
								// 	</li>
								// </ul>
								if ( isAtEnd == 1 ) {
									// Move the cursor to <em> if attached to "x" text node.
									cursor.optimize();

									// Abort if the range is attached directly in <li>, like
									//
									// <ul>
									// 	<li>
									// 		x^
									// 		<ul>
									// 			<li><span>y</span></li>
									// 		</ul>
									// 	</li>
									// </ul>
									if ( !cursor.startContainer.equals( li ) ) {
										var node = cursor.startContainer,
											farthestInlineAscendant;

										// Find <a>, which is farthest from <em> but still inline element.
										while ( node.is( CKEDITOR.dtd.$inline ) ) {
											farthestInlineAscendant = node;
											node = node.getParent();
										}

										// Move the range so it does not contain inline elements.
										// It prevents <span> from being included in <em>.
										//
										// <ul>
										// 	<li>
										// 		<p><a href="#one"><em>x</em></a>^</p>
										// 		<ul>
										// 			<li><span>y</span></li>
										// 		</ul>
										// 	</li>
										// </ul>
										//
										// so instead of
										//
										// <ul>
										// 	<li>
										// 		<p><a href="#one"><em>x^<span>y</span></em></a></p>
										// 	</li>
										// </ul>
										//
										// pressing DELETE produces
										//
										// <ul>
										// 	<li>
										// 		<p><a href="#one"><em>x</em></a>^<span>y</span></p>
										// 	</li>
										// </ul>
										if ( farthestInlineAscendant ) {
											cursor.moveToPosition( farthestInlineAscendant, CKEDITOR.POSITION_AFTER_END );
										}
									}
								}

								// Moving `cursor` and `next line` only when at the end literally (https://dev.ckeditor.com/ticket/12729).
								if ( isAtEnd == 2 ) {
									cursor.moveToPosition( cursor.endPath().block, CKEDITOR.POSITION_BEFORE_END );

									// Next line might be text node not wrapped in block element.
									if ( nextLine.endPath().block ) {
										nextLine.moveToPosition( nextLine.endPath().block, CKEDITOR.POSITION_AFTER_START );
									}
								}

								joinNextLineToCursor( editor, cursor, nextLine );
								evt.cancel();
							}
						} else {
							// Handle Del key pressed before the list.
							walker.range.setEndAt( editable, CKEDITOR.POSITION_BEFORE_END );
							next = walker.next();

							if ( next && next.type == CKEDITOR.NODE_ELEMENT && next.is( listNodeNames ) ) {
								// The start <li>
								next = next.getFirst( nonEmpty );

								// Simply remove the current empty block, move cursor to the
								// subsequent list.
								if ( path.block && range.checkStartOfBlock() && range.checkEndOfBlock() ) {
									path.block.remove();
									range.moveToElementEditStart( next );
									range.select();
									evt.cancel();
								}
								// Preventing the default (merge behavior), but simply move
								// the cursor one character forward if subsequent list item
								// contains sub list.
								else if ( getSubList( next )  ) {
									range.moveToElementEditStart( next );
									range.select();
									evt.cancel();
								}
								// Merge the first list item with the current line.
								else {
									nextLine = range.clone();
									nextLine.moveToElementEditStart( next );
									joinNextLineToCursor( editor, cursor, nextLine );
									evt.cancel();
								}
							}
						}

					}

					// The backspace/del could potentially put cursor at a bad position,
					// being it handled or not, check immediately the selection to have it fixed.
					setTimeout( function() {
						editor.selectionChange( 1 );
					} );
				}
			} );
		}
	} );
} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

CKEDITOR.plugins.add( 'menu', {
	requires: 'floatpanel',

	beforeInit: function( editor ) {
		var groups = editor.config.menu_groups.split( ',' ),
			groupsOrder = editor._.menuGroups = {},
			menuItems = editor._.menuItems = {};

		for ( var i = 0; i < groups.length; i++ )
			groupsOrder[ groups[ i ] ] = i + 1;

		/**
		 * Registers an item group to the editor context menu in order to make it
		 * possible to associate it with menu items later.
		 *
		 * @param {String} name Specify a group name.
		 * @param {Number} [order=100] Define the display sequence of this group
		 * inside the menu. A smaller value gets displayed first.
		 * @member CKEDITOR.editor
		 */
		editor.addMenuGroup = function( name, order ) {
			groupsOrder[ name ] = order || 100;
		};

		/**
		 * Adds an item from the specified definition to the editor context menu.
		 *
		 * @method
		 * @param {String} name The menu item name.
		 * @param {Object} definition The menu item definition.
		 * @member CKEDITOR.editor
		 */
		editor.addMenuItem = function( name, definition ) {
			if ( groupsOrder[ definition.group ] )
				menuItems[ name ] = new CKEDITOR.menuItem( this, name, definition );
		};

		/**
		 * Adds one or more items from the specified definition object to the editor context menu.
		 *
		 * @method
		 * @param {Object} definitions Object where keys are used as itemName and corresponding values as definition for a {@link #addMenuItem} call.
		 * @member CKEDITOR.editor
		 */
		editor.addMenuItems = function( definitions ) {
			for ( var itemName in definitions ) {
				this.addMenuItem( itemName, definitions[ itemName ] );
			}
		};

		/**
		 * Retrieves a particular menu item definition from the editor context menu.
		 *
		 * @method
		 * @param {String} name The name of the desired menu item.
		 * @returns {Object}
		 * @member CKEDITOR.editor
		 */
		editor.getMenuItem = function( name ) {
			return menuItems[ name ];
		};

		/**
		 * Removes a particular menu item added before from the editor context menu.
		 *
		 * @since 3.6.1
		 * @method
		 * @param {String} name The name of the desired menu item.
		 * @member CKEDITOR.editor
		 */
		editor.removeMenuItem = function( name ) {
			delete menuItems[ name ];
		};
	}
} );

( function() {
	var menuItemSource = '<span class="cke_menuitem">' +
		'<a id="{id}"' +
		' class="cke_menubutton cke_menubutton__{name} cke_menubutton_{state} {cls}" href="{href}"' +
		' title="{title}"' +
		' tabindex="-1"' +
		' _cke_focus=1' +
		' hidefocus="true"' +
		' role="{role}"' +
		' aria-label="{label}"' +
		' aria-describedby="{id}_description"' +
		' aria-haspopup="{hasPopup}"' +
		' aria-disabled="{disabled}"' +
		' {ariaChecked}' +
		' draggable="false"';

	// Some browsers don't cancel key events in the keydown but in the
	// keypress.
	// TODO: Check if really needed.
	if ( CKEDITOR.env.gecko && CKEDITOR.env.mac )
		menuItemSource += ' onkeypress="return false;"';

	// With Firefox, we need to force the button to redraw, otherwise it
	// will remain in the focus state. Also we some extra help to prevent dragging (https://dev.ckeditor.com/ticket/10373).
	if ( CKEDITOR.env.gecko ) {
		menuItemSource += ( ' onblur="this.style.cssText = this.style.cssText;"' +
			' ondragstart="return false;"' );
	}

	// https://dev.ckeditor.com/ticket/188
	menuItemSource += ' onmouseover="CKEDITOR.tools.callFunction({hoverFn},{index});"' +
			' onmouseout="CKEDITOR.tools.callFunction({moveOutFn},{index});" ' +
			( CKEDITOR.env.ie ? 'onclick="return false;" onmouseup' : 'onclick' ) +
				'="CKEDITOR.tools.callFunction({clickFn},{index}); return false;"' +
			'>';

	menuItemSource +=
				//'' +
				'<span class="cke_menubutton_inner">' +
					'<span class="cke_menubutton_icon">' +
						'<span class="cke_button_icon cke_button__{iconName}_icon" style="{iconStyle}"></span>' +
					'</span>' +
					'<span class="cke_menubutton_label">' +
						'{label}' +
					'</span>' +
					'{shortcutHtml}' +
					'{arrowHtml}' +
				'</span>' +
			'</a><span id="{id}_description" class="cke_voice_label" aria-hidden="false">{ariaShortcut}</span></span>';

	var menuArrowSource = '<span class="cke_menuarrow">' +
				'<span>{label}</span>' +
			'</span>';

	var menuShortcutSource = '<span class="cke_menubutton_label cke_menubutton_shortcut">' +
				'{shortcut}' +
			'</span>';

	var menuItemTpl = CKEDITOR.addTemplate( 'menuItem', menuItemSource ),
		menuArrowTpl = CKEDITOR.addTemplate( 'menuArrow', menuArrowSource ),
		menuShortcutTpl = CKEDITOR.addTemplate( 'menuShortcut', menuShortcutSource );

	/**
	 * @class
	 * @todo
	 */
	CKEDITOR.menu = CKEDITOR.tools.createClass( {
		/**
		 * @constructor
		 */
		$: function( editor, definition ) {
			definition = this._.definition = definition || {};
			this.id = CKEDITOR.tools.getNextId();

			this.editor = editor;
			this.items = [];
			this._.listeners = [];

			this._.level = definition.level || 1;

			var panelDefinition = CKEDITOR.tools.extend( {}, definition.panel, {
				css: [ CKEDITOR.skin.getPath( 'editor' ) ],
				level: this._.level - 1,
				block: {}
			} );

			var attrs = panelDefinition.block.attributes = ( panelDefinition.attributes || {} );
			// Provide default role of 'menu'.
			!attrs.role && ( attrs.role = 'menu' );
			this._.panelDefinition = panelDefinition;
		},

		_: {
			onShow: function() {
				var selection = this.editor.getSelection(),
					start = selection && selection.getStartElement(),
					path = this.editor.elementPath(),
					listeners = this._.listeners;

				this.removeAll();
				// Call all listeners, filling the list of items to be displayed.
				for ( var i = 0; i < listeners.length; i++ ) {
					var listenerItems = listeners[ i ]( start, selection, path );

					if ( listenerItems ) {
						for ( var itemName in listenerItems ) {
							var item = this.editor.getMenuItem( itemName );

							if ( item && ( !item.command || this.editor.getCommand( item.command ).state ) ) {
								item.state = listenerItems[ itemName ];
								this.add( item );
							}
						}
					}
				}
			},

			onClick: function( item ) {
				this.hide();

				if ( item.onClick )
					item.onClick();
				else if ( item.command )
					this.editor.execCommand( item.command );
			},

			onEscape: function( keystroke ) {
				var parent = this.parent;
				// 1. If it's sub-menu, close it, with focus restored on this.
				// 2. In case of a top-menu, close it, with focus returned to page.
				if ( parent )
					parent._.panel.hideChild( 1 );
				else if ( keystroke == 27 )
					this.hide( 1 );

				return false;
			},

			onHide: function() {
				this.onHide && this.onHide();
			},

			showSubMenu: function( index ) {
				var menu = this._.subMenu,
					item = this.items[ index ],
					subItemDefs = item.getItems && item.getItems();

				// If this item has no subitems, we just hide the submenu, if
				// available, and return back.
				if ( !subItemDefs ) {
					// Hide sub menu with focus returned.
					this._.panel.hideChild( 1 );
					return;
				}

				// Create the submenu, if not available, or clean the existing
				// one.
				if ( menu )
					menu.removeAll();
				else {
					menu = this._.subMenu = new CKEDITOR.menu( this.editor, CKEDITOR.tools.extend( {}, this._.definition, { level: this._.level + 1 }, true ) );
					menu.parent = this;
					menu._.onClick = CKEDITOR.tools.bind( this._.onClick, this );
				}

				// Add all submenu items to the menu.
				for ( var subItemName in subItemDefs ) {
					var subItem = this.editor.getMenuItem( subItemName );
					if ( subItem ) {
						subItem.state = subItemDefs[ subItemName ];
						menu.add( subItem );
					}
				}

				// Get the element representing the current item.
				var element = this._.panel.getBlock( this.id ).element.getDocument().getById( this.id + String( index ) );

				// Show the submenu.
				// This timeout is needed to give time for the sub-menu get
				// focus when JAWS is running. (https://dev.ckeditor.com/ticket/9844)
				setTimeout( function() {
					menu.show( element, 2 );
				}, 0 );
			}
		},

		proto: {
			/**
			 * Adds an item.
			 *
			 * @param item
			 */
			add: function( item ) {
				// Later we may sort the items, but Array#sort is not stable in
				// some browsers, here we're forcing the original sequence with
				// 'order' attribute if it hasn't been assigned. (https://dev.ckeditor.com/ticket/3868)
				if ( !item.order )
					item.order = this.items.length;

				this.items.push( item );
			},

			/**
			 * Removes all items.
			 */
			removeAll: function() {
				this.items = [];
			},

			/**
			 * Shows the menu in given location.
			 *
			 * @param {CKEDITOR.dom.element} offsetParent
			 * @param {Number} [corner]
			 * @param {Number} [offsetX]
			 * @param {Number} [offsetY]
			 */
			show: function( offsetParent, corner, offsetX, offsetY ) {
				// Not for sub menu.
				if ( !this.parent ) {
					this._.onShow();
					// Don't menu with zero items.
					if ( !this.items.length )
						return;
				}

				corner = corner || ( this.editor.lang.dir == 'rtl' ? 2 : 1 );

				var items = this.items,
					editor = this.editor,
					panel = this._.panel,
					element = this._.element;

				// Create the floating panel for this menu.
				if ( !panel ) {
					panel = this._.panel = new CKEDITOR.ui.floatPanel( this.editor, CKEDITOR.document.getBody(), this._.panelDefinition, this._.level );

					panel.onEscape = CKEDITOR.tools.bind( function( keystroke ) {
						if ( this._.onEscape( keystroke ) === false )
							return false;
					}, this );

					panel.onShow = function() {
						// Menu need CSS resets, compensate class name.
						var holder = panel._.panel.getHolderElement();
						holder.getParent().addClass( 'cke' ).addClass( 'cke_reset_all' );
					};

					panel.onHide = CKEDITOR.tools.bind( function() {
						this._.onHide && this._.onHide();
					}, this );

					// Create an autosize block inside the panel.
					var block = panel.addBlock( this.id, this._.panelDefinition.block );
					block.autoSize = true;

					var keys = block.keys;
					keys[ 40 ] = 'next'; // ARROW-DOWN
					keys[ 9 ] = 'next'; // TAB
					keys[ 38 ] = 'prev'; // ARROW-UP
					keys[ CKEDITOR.SHIFT + 9 ] = 'prev'; // SHIFT + TAB
					keys[ ( editor.lang.dir == 'rtl' ? 37 : 39 ) ] = CKEDITOR.env.ie ? 'mouseup' : 'click'; // ARROW-RIGHT/ARROW-LEFT(rtl)
					keys[ 32 ] = CKEDITOR.env.ie ? 'mouseup' : 'click'; // SPACE
					CKEDITOR.env.ie && ( keys[ 13 ] = 'mouseup' ); // Manage ENTER, since onclick is blocked in IE (https://dev.ckeditor.com/ticket/8041).

					element = this._.element = block.element;

					var elementDoc = element.getDocument();
					elementDoc.getBody().setStyle( 'overflow', 'hidden' );
					elementDoc.getElementsByTag( 'html' ).getItem( 0 ).setStyle( 'overflow', 'hidden' );

					this._.itemOverFn = CKEDITOR.tools.addFunction( function( index ) {
						clearTimeout( this._.showSubTimeout );
						this._.showSubTimeout = CKEDITOR.tools.setTimeout( this._.showSubMenu, editor.config.menu_subMenuDelay || 400, this, [ index ] );
					}, this );

					this._.itemOutFn = CKEDITOR.tools.addFunction( function() {
						clearTimeout( this._.showSubTimeout );
					}, this );

					this._.itemClickFn = CKEDITOR.tools.addFunction( function( index ) {
						var item = this.items[ index ];

						if ( item.state == CKEDITOR.TRISTATE_DISABLED ) {
							this.hide( 1 );
							return;
						}

						if ( item.getItems )
							this._.showSubMenu( index );
						else
							this._.onClick( item );
					}, this );
				}

				// Put the items in the right order.
				sortItems( items );

				// Apply the editor mixed direction status to menu.
				var path = editor.elementPath(),
					mixedDirCls = ( path && path.direction() != editor.lang.dir ) ? ' cke_mixed_dir_content' : '';

				// Build the HTML that composes the menu and its items.
				var output = [ '<div class="cke_menu' + mixedDirCls + '" role="presentation">' ];

				var length = items.length,
					lastGroup = length && items[ 0 ].group;

				for ( var i = 0; i < length; i++ ) {
					var item = items[ i ];
					if ( lastGroup != item.group ) {
						output.push( '<div class="cke_menuseparator" role="separator"></div>' );
						lastGroup = item.group;
					}

					item.render( this, i, output );
				}

				output.push( '</div>' );

				// Inject the HTML inside the panel.
				element.setHtml( output.join( '' ) );

				CKEDITOR.ui.fire( 'ready', this );

				// Show the panel.
				if ( this.parent ) {
					this.parent._.panel.showAsChild( panel, this.id, offsetParent, corner, offsetX, offsetY );
				} else {
					panel.showBlock( this.id, offsetParent, corner, offsetX, offsetY );
				}

				var data = [ panel ];
				editor.fire( 'menuShow', data );
			},

			/**
			 * Adds a callback executed on opening the menu. Items
			 * returned by that callback are added to the menu.
			 *
			 * @param {Function} listenerFn
			 * @param {CKEDITOR.dom.element} listenerFn.startElement The selection start anchor element.
			 * @param {CKEDITOR.dom.selection} listenerFn.selection The current selection.
			 * @param {CKEDITOR.dom.elementPath} listenerFn.path The current elements path.
			 * @param listenerFn.return Object (`commandName` => `state`) of items that should be added to the menu.
			 */
			addListener: function( listenerFn ) {
				this._.listeners.push( listenerFn );
			},

			/**
			 * Hides the menu.
			 *
			 * @param {Boolean} [returnFocus]
			 */
			hide: function( returnFocus ) {
				this._.onHide && this._.onHide();
				this._.panel && this._.panel.hide( returnFocus );
			},

			/**
			 * Finds the menu item corresponding to a given command.
			 *
			 * **Notice**: Keep in mind that the menu is re-rendered on each opening, so caching items (especially DOM elements)
			 * may not work. Also executing this method when the menu is not visible may give unexpected results as the
			 * items may not be rendered.
			 *
			 * @since 4.9.0
			 * @param {String} commandName
			 * @returns {Object/null} return An object containing a given item. If the item was not found, `null` is returned.
			 * @returns {CKEDITOR.menuItem} return.item The item definition.
			 * @returns {CKEDITOR.dom.element} return.element The rendered element representing the item in the menu.
			 */
			findItemByCommandName: function( commandName ) {
				var commands = CKEDITOR.tools.array.filter( this.items, function( item ) {
					return commandName === item.command;
				} );

				if ( commands.length ) {
					var commandItem = commands[ 0 ];

					return {
						item: commandItem,
						element: this._.element.findOne( '.' + commandItem.className )
					};
				}

				return null;
			}
		}
	} );

	function sortItems( items ) {
		items.sort( function( itemA, itemB ) {
			if ( itemA.group < itemB.group )
				return -1;
			else if ( itemA.group > itemB.group )
				return 1;

			return itemA.order < itemB.order ? -1 : itemA.order > itemB.order ? 1 : 0;
		} );
	}

	/**
	 * @class
	 * @todo
	 */
	CKEDITOR.menuItem = CKEDITOR.tools.createClass( {
		$: function( editor, name, definition ) {
			CKEDITOR.tools.extend( this, definition,
			// Defaults
			{
				order: 0,
				className: 'cke_menubutton__' + name
			} );

			// Transform the group name into its order number.
			this.group = editor._.menuGroups[ this.group ];

			this.editor = editor;
			this.name = name;
		},

		proto: {
			render: function( menu, index, output ) {
				var id = menu.id + String( index ),
					state = ( typeof this.state == 'undefined' ) ? CKEDITOR.TRISTATE_OFF : this.state,
					ariaChecked = '',
					editor = this.editor,
					keystroke,
					command,
					shortcut;

				var stateName = state == CKEDITOR.TRISTATE_ON ? 'on' : state == CKEDITOR.TRISTATE_DISABLED ? 'disabled' : 'off';

				if ( this.role in { menuitemcheckbox: 1, menuitemradio: 1 } )
					ariaChecked = ' aria-checked="' + ( state == CKEDITOR.TRISTATE_ON ? 'true' : 'false' ) + '"';

				var hasSubMenu = this.getItems;
				// ltr: BLACK LEFT-POINTING POINTER
				// rtl: BLACK RIGHT-POINTING POINTER
				var arrowLabel = '&#' + ( this.editor.lang.dir == 'rtl' ? '9668' : '9658' ) + ';';

				var iconName = this.name;
				if ( this.icon && !( /\./ ).test( this.icon ) )
					iconName = this.icon;

				if ( this.command ) {
					command = editor.getCommand( this.command );
					keystroke = editor.getCommandKeystroke( command );

					if ( keystroke ) {
						shortcut = CKEDITOR.tools.keystrokeToString( editor.lang.common.keyboard, keystroke );
					}
				}

				var params = {
					id: id,
					name: this.name,
					iconName: iconName,
					label: this.label,
					cls: this.className || '',
					state: stateName,
					hasPopup: hasSubMenu ? 'true' : 'false',
					disabled: state == CKEDITOR.TRISTATE_DISABLED,
					title: this.label + ( shortcut ? ' (' + shortcut.display + ')' : '' ),
					ariaShortcut: shortcut ? editor.lang.common.keyboardShortcut + ' ' + shortcut.aria : '',
					href: 'javascript:void(\'' + ( this.label || '' ).replace( "'" + '' ) + '\')', // jshint ignore:line
					hoverFn: menu._.itemOverFn,
					moveOutFn: menu._.itemOutFn,
					clickFn: menu._.itemClickFn,
					index: index,
					iconStyle: CKEDITOR.skin.getIconStyle( iconName, ( this.editor.lang.dir == 'rtl' ), iconName == this.icon ? null : this.icon, this.iconOffset ),
					shortcutHtml: shortcut ? menuShortcutTpl.output( { shortcut: shortcut.display } ) : '',
					arrowHtml: hasSubMenu ? menuArrowTpl.output( { label: arrowLabel } ) : '',
					role: this.role ? this.role : 'menuitem',
					ariaChecked: ariaChecked
				};

				menuItemTpl.output( params, output );
			}
		}
	} );

} )();


/**
 * The amount of time, in milliseconds, the editor waits before displaying submenu
 * options when moving the mouse over options that contain submenus, like the
 * "Cell Properties" entry for tables.
 *
 *		// Remove the submenu delay.
 *		config.menu_subMenuDelay = 0;
 *
 * @cfg {Number} [menu_subMenuDelay=400]
 * @member CKEDITOR.config
 */

/**
 * Fired when a menu is shown.
 *
 * @event menuShow
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param {CKEDITOR.ui.panel[]} data
 */

/**
 * A comma separated list of items group names to be displayed in the context
 * menu. The order of items will reflect the order specified in this list if
 * no priority was defined in the groups.
 *
 *		config.menu_groups = 'clipboard,table,anchor,link,image';
 *
 * @cfg {String} [menu_groups=see source]
 * @member CKEDITOR.config
 */
CKEDITOR.config.menu_groups = 'clipboard,' +
	'form,' +
	'tablecell,tablecellproperties,tablerow,tablecolumn,table,' +
	'anchor,link,image,flash,' +
	'checkbox,radio,textfield,hiddenfield,imagebutton,button,select,textarea,div';

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

CKEDITOR.plugins.add( 'contextmenu', {
	requires: 'menu',

	// jscs:disable maximumLineLength
	// jscs:enable maximumLineLength

	// Make sure the base class (CKEDITOR.menu) is loaded before it (https://dev.ckeditor.com/ticket/3318).
	onLoad: function() {
		/**
		 * Class replacing the non-configurable native context menu with a configurable CKEditor's equivalent.
		 *
		 * @class
		 * @extends CKEDITOR.menu
		 */
		CKEDITOR.plugins.contextMenu = CKEDITOR.tools.createClass( {
			base: CKEDITOR.menu,

			/**
			 * Creates the CKEDITOR.plugins.contextMenu class instance.
			 *
			 * @constructor
			 * @param {CKEDITOR.editor} editor
			 */
			$: function( editor ) {
				this.base.call( this, editor, {
					panel: {
						// Allow adding custom CSS (#2202).
						css: editor.config.contextmenu_contentsCss,
						className: 'cke_menu_panel',
						attributes: {
							'aria-label': editor.lang.contextmenu.options
						}
					}
				} );
			},

			proto: {
				/**
				 * Starts watching on native context menu triggers (<kbd>Option</kbd> key, right click) on the given element.
				 *
				 * @param {CKEDITOR.dom.element} element
				 * @param {Boolean} [nativeContextMenuOnCtrl] Whether to open native context menu if the
				 * <kbd>Ctrl</kbd> key is held on opening the context menu. See {@link CKEDITOR.config#browserContextMenuOnCtrl}.
				 */
				addTarget: function( element, nativeContextMenuOnCtrl ) {
					var holdCtrlKey,
						keystrokeActive;

					element.on( 'contextmenu', function( event ) {
						var domEvent = event.data,
							isCtrlKeyDown =
								// Safari on Windows always show 'ctrlKey' as true in 'contextmenu' event,
								// which make this property unreliable. (https://dev.ckeditor.com/ticket/4826)
								( CKEDITOR.env.webkit ? holdCtrlKey : ( CKEDITOR.env.mac ? domEvent.$.metaKey : domEvent.$.ctrlKey ) );

						if ( nativeContextMenuOnCtrl && isCtrlKeyDown ) {
							return;
						}

						// Cancel the browser context menu.
						domEvent.preventDefault();

						// Do not react to this event, as it might open context menu in wrong position (#2548).
						if ( keystrokeActive ) {
							return;
						}

						// Fix selection when non-editable element in Webkit/Blink (Mac) (https://dev.ckeditor.com/ticket/11306).
						if ( CKEDITOR.env.mac && CKEDITOR.env.webkit ) {
							var editor = this.editor,
								contentEditableParent = new CKEDITOR.dom.elementPath( domEvent.getTarget(), editor.editable() ).contains( function( el ) {
									// Return when non-editable or nested editable element is found.
									return el.hasAttribute( 'contenteditable' );
								}, true ); // Exclude editor's editable.

							// Fake selection for non-editables only (to exclude nested editables).
							if ( contentEditableParent && contentEditableParent.getAttribute( 'contenteditable' ) == 'false' ) {
								editor.getSelection().fake( contentEditableParent );
							}
						}

						var doc = domEvent.getTarget().getDocument(),
							offsetParent = domEvent.getTarget().getDocument().getDocumentElement(),
							fromFrame = !doc.equals( CKEDITOR.document ),
							scroll = doc.getWindow().getScrollPosition(),
							offsetX = fromFrame ? domEvent.$.clientX : domEvent.$.pageX || scroll.x + domEvent.$.clientX,
							offsetY = fromFrame ? domEvent.$.clientY : domEvent.$.pageY || scroll.y + domEvent.$.clientY;

						CKEDITOR.tools.setTimeout( function() {
							this.open( offsetParent, null, offsetX, offsetY );
							// IE needs a short while to allow selection change before opening menu. (https://dev.ckeditor.com/ticket/7908)
						}, CKEDITOR.env.ie ? 200 : 0, this );
					}, this );

					if ( CKEDITOR.env.webkit ) {
						var onKeyDown = function( event ) {
								holdCtrlKey = CKEDITOR.env.mac ? event.data.$.metaKey : event.data.$.ctrlKey;
							},
							resetOnKeyUp = function() {
								holdCtrlKey = 0;
							};

						element.on( 'keydown', onKeyDown );
						element.on( 'keyup', resetOnKeyUp );
						element.on( 'contextmenu', resetOnKeyUp );
					}

					// Block subsequent contextmenu event, when Shift + F10 is pressed (#2548).
					if ( CKEDITOR.env.gecko && !CKEDITOR.env.mac ) {
						element.on( 'keydown', function( evt ) {
							if ( evt.data.$.shiftKey && evt.data.$.keyCode === 121 ) {
								keystrokeActive = true;
							}
						}, null, null, 0 );

						element.on( 'keyup', resetKeystrokeState );
						element.on( 'contextmenu', resetKeystrokeState );
					}

					function resetKeystrokeState() {
						keystrokeActive = false;
					}
				},

				/**
				 * Opens the context menu in the given location. See the {@link CKEDITOR.menu#show} method.
				 *
				 * @param {CKEDITOR.dom.element} offsetParent
				 * @param {Number} [corner]
				 * @param {Number} [offsetX]
				 * @param {Number} [offsetY]
				 */
				open: function( offsetParent, corner, offsetX, offsetY ) {
					// Do not open context menu if it's disabled or there is no selection in the editor (#1181).
					if ( this.editor.config.enableContextMenu === false ||
						this.editor.getSelection().getType() === CKEDITOR.SELECTION_NONE ) {
						return;
					}

					this.editor.focus();
					offsetParent = offsetParent || CKEDITOR.document.getDocumentElement();

					// https://dev.ckeditor.com/ticket/9362: Force selection check to update commands' states in the new context.
					this.editor.selectionChange( 1 );
					this.show( offsetParent, corner, offsetX, offsetY );
				}
			}
		} );
	},

	beforeInit: function( editor ) {
		/**
		 * @readonly
		 * @property {CKEDITOR.plugins.contextMenu} contextMenu
		 * @member CKEDITOR.editor
		 */
		var contextMenu = editor.contextMenu = new CKEDITOR.plugins.contextMenu( editor );

		editor.on( 'contentDom', function() {
			contextMenu.addTarget( editor.editable(), editor.config.browserContextMenuOnCtrl !== false );
		} );

		editor.addCommand( 'contextMenu', {
			exec: function( editor ) {
				var offsetX = 0,
					offsetY = 0,
					ranges = editor.getSelection().getRanges(),
					rects,
					rect;

				// When opening context menu via keystroke there is no offsetX and Y passed (#1451).
				rects = ranges[ ranges.length - 1 ].getClientRects( editor.editable().isInline() );
				rect = rects[ rects.length - 1 ];

				if ( rect ) {
					offsetX = rect[ editor.lang.dir === 'rtl' ? 'left' : 'right' ];
					offsetY = rect.bottom;
				}

				editor.contextMenu.open( editor.document.getBody().getParent(), null, offsetX, offsetY );
			}
		} );

		editor.setKeystroke( CKEDITOR.SHIFT + 121 /*F10*/, 'contextMenu' );
		editor.setKeystroke( CKEDITOR.CTRL + CKEDITOR.SHIFT + 121 /*F10*/, 'contextMenu' );
	}
} );

/**
 * Whether to show the browser native context menu when the <kbd>Ctrl</kbd> or
 * <kbd>Meta</kbd> (Mac) key is pressed on opening the context menu with the
 * right mouse button click or the <kbd>Menu</kbd> key.
 *
 * ```javascript
 * config.browserContextMenuOnCtrl = false;
 * ```
 *
 * @since 3.0.2
 * @cfg {Boolean} [browserContextMenuOnCtrl=true]
 * @member CKEDITOR.config
 */

/**
 * Whether to enable the context menu. Regardless of the setting the [Context Menu](https://ckeditor.com/cke4/addon/contextmenu)
 * plugin is still loaded.
 *
 * ```javascript
 * config.enableContextMenu = false;
 * ```
 *
 * @since 4.7.0
 * @cfg {Boolean} [enableContextMenu=true]
 * @member CKEDITOR.config
 */

/**
 * The CSS file(s) to be used to apply the style to the context menu content.
 *
 * ```javascript
 * config.contextmenu_contentsCss = '/css/myfile.css';
 * config.contextmenu_contentsCss = [ '/css/myfile.css', '/css/anotherfile.css' ];
 * ```
 *
 * @since 4.11.0
 * @cfg {String/String[]} [contextmenu_contentsCss=CKEDITOR.skin.getPath( 'editor' )]
 * @member CKEDITOR.config
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

( function() {
	CKEDITOR.plugins.liststyle = {
		requires: 'dialog,contextmenu',
		// jscs:disable maximumLineLength
		// jscs:enable maximumLineLength
		init: function( editor ) {
			if ( editor.blockless )
				return;

			var def, cmd;

			def = new CKEDITOR.dialogCommand( 'numberedListStyle', {
				requiredContent: 'ol',
				allowedContent: 'ol{list-style-type}[start]; li{list-style-type}[value]',
				contentTransformations: [
					[ 'ol: listTypeToStyle' ]
				]
			} );
			cmd = editor.addCommand( 'numberedListStyle', def );
			editor.addFeature( cmd );
			CKEDITOR.dialog.add( 'numberedListStyle', this.path + 'dialogs/liststyle.js' );

			def = new CKEDITOR.dialogCommand( 'bulletedListStyle', {
				requiredContent: 'ul',
				allowedContent: 'ul{list-style-type}',
				contentTransformations: [
					[ 'ul: listTypeToStyle' ]
				]
			} );
			cmd = editor.addCommand( 'bulletedListStyle', def );
			editor.addFeature( cmd );
			CKEDITOR.dialog.add( 'bulletedListStyle', this.path + 'dialogs/liststyle.js' );

			//Register map group;
			editor.addMenuGroup( 'list', 108 );

			editor.addMenuItems( {
				numberedlist: {
					label: editor.lang.liststyle.numberedTitle,
					group: 'list',
					command: 'numberedListStyle'
				},
				bulletedlist: {
					label: editor.lang.liststyle.bulletedTitle,
					group: 'list',
					command: 'bulletedListStyle'
				}
			} );

			editor.contextMenu.addListener( function( element ) {
				if ( !element || element.isReadOnly() )
					return null;

				while ( element ) {
					var name = element.getName();
					if ( name == 'ol' )
						return { numberedlist: CKEDITOR.TRISTATE_OFF };
					else if ( name == 'ul' )
						return { bulletedlist: CKEDITOR.TRISTATE_OFF };

					element = element.getParent();
				}
				return null;
			} );
		}
	};

	CKEDITOR.plugins.add( 'liststyle', CKEDITOR.plugins.liststyle );
} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview The [Magic Line](https://ckeditor.com/cke4/addon/magicline) plugin that makes it easier to access some document areas that
 * are difficult to focus.
 */

'use strict';

( function() {
	CKEDITOR.plugins.add( 'magicline', {
		init: initPlugin
	} );

	// Activates the box inside of an editor.
	function initPlugin( editor ) {
		// Configurables
		var config = editor.config,
			triggerOffset = config.magicline_triggerOffset || 30,
			enterMode = config.enterMode,
			that = {
				// Global stuff is being initialized here.
				editor: editor,
				enterMode: enterMode,
				triggerOffset: triggerOffset,
				holdDistance: 0 | triggerOffset * ( config.magicline_holdDistance || 0.5 ),
				boxColor: config.magicline_color || '#ff0000',
				rtl: config.contentsLangDirection == 'rtl',
				tabuList: [ 'data-cke-hidden-sel' ].concat( config.magicline_tabuList || [] ),
				triggers: config.magicline_everywhere ? DTD_BLOCK : { table: 1, hr: 1, div: 1, ul: 1, ol: 1, dl: 1, form: 1, blockquote: 1 }
			},
			scrollTimeout, checkMouseTimeoutPending, checkMouseTimer;


		// Simple irrelevant elements filter.
		that.isRelevant = function( node ) {
			return isHtml( node ) && // -> Node must be an existing HTML element.
				!isLine( that, node ) && // -> Node can be neither the box nor its child.
				!isFlowBreaker( node ); // -> Node can be neither floated nor positioned nor aligned.
		};

		editor.on( 'contentDom', addListeners, this );

		function addListeners() {
			var editable = editor.editable(),
				doc = editor.document,
				win = editor.window;

			// Global stuff is being initialized here.
			extend( that, {
				editable: editable,
				inInlineMode: editable.isInline(),
				doc: doc,
				win: win,
				hotNode: null
			}, true );

			// This is the boundary of the editor. For inline the boundary is editable itself.
			// For classic (`iframe`-based) editor, the HTML element is a real boundary.
			that.boundary = that.inInlineMode ? that.editable : that.doc.getDocumentElement();

			// Enabling the box inside of inline editable is pointless.
			// There's no need to access spaces inside paragraphs, links, spans, etc.
			if ( editable.is( dtd.$inline ) )
				return;

			// Handle in-line editing by setting appropriate position.
			// If current position is static, make it relative and clear top/left coordinates.
			if ( that.inInlineMode && !isPositioned( editable ) ) {
				editable.setStyles( {
					position: 'relative',
					top: null,
					left: null
				} );
			}
			// Enable the box. Let it produce children elements, initialize
			// event handlers and own methods.
			initLine.call( this, that );

			// Get view dimensions and scroll positions.
			// At this stage (before any checkMouse call) it is used mostly
			// by tests. Nevertheless it a crucial thing.
			updateWindowSize( that );

			// Remove the box before an undo image is created.
			// This is important. If we didn't do that, the *undo thing* would revert the box into an editor.
			// Thanks to that, undo doesn't even know about the existence of the box.
			editable.attachListener( editor, 'beforeUndoImage', function() {
				that.line.detach();
			} );

			// Removes the box HTML from editor data string if getData is called.
			// Thanks to that, an editor never yields data polluted by the box.
			// Listen with very high priority, so line will be removed before other
			// listeners will see it.
			editable.attachListener( editor, 'beforeGetData', function() {
				// If the box is in editable, remove it.
				if ( that.line.wrap.getParent() ) {
					that.line.detach();

					// Restore line in the last listener for 'getData'.
					editor.once( 'getData', function() {
						that.line.attach();
					}, null, null, 1000 );
				}
			}, null, null, 0 );

			// Hide the box on mouseout if mouse leaves document.
			editable.attachListener( that.inInlineMode ? doc : doc.getWindow().getFrame(), 'mouseout', function( event ) {
				if ( editor.mode != 'wysiwyg' )
					return;

				// Check for inline-mode editor. If so, check mouse position
				// and remove the box if mouse outside of an editor.
				if ( that.inInlineMode ) {
					var mouse = {
						x: event.data.$.clientX,
						y: event.data.$.clientY
					};

					updateWindowSize( that );
					updateEditableSize( that, true );

					var size = that.view.editable,
						scroll = that.view.scroll;

					// If outside of an editor...
					if ( !inBetween( mouse.x, size.left - scroll.x, size.right - scroll.x ) || !inBetween( mouse.y, size.top - scroll.y, size.bottom - scroll.y ) ) {
						clearTimeout( checkMouseTimer );
						checkMouseTimer = null;
						that.line.detach();
					}
				}

				else {
					clearTimeout( checkMouseTimer );
					checkMouseTimer = null;
					that.line.detach();
				}
			} );

			// This one deactivates hidden mode of an editor which
			// prevents the box from being shown.
			editable.attachListener( editable, 'keyup', function() {
				that.hiddenMode = 0;
			} );

			editable.attachListener( editable, 'keydown', function( event ) {
				if ( editor.mode != 'wysiwyg' )
					return;

				var keyStroke = event.data.getKeystroke();

				switch ( keyStroke ) {
					// Shift pressed
					case 2228240: // IE
					case 16:
						that.hiddenMode = 1;
						that.line.detach();
				}

			} );

			// This method ensures that checkMouse aren't executed
			// in parallel and no more frequently than specified in timeout function.
			// In classic (`iframe`-based) editor, document is used as a trigger, to provide magicline
			// functionality when mouse is below the body (short content, short body).
			editable.attachListener( that.inInlineMode ? editable : doc, 'mousemove', function( event ) {
				checkMouseTimeoutPending = true;

				if ( editor.mode != 'wysiwyg' || editor.readOnly || checkMouseTimer )
					return;

				// IE<9 requires this event-driven object to be created
				// outside of the setTimeout statement.
				// Otherwise it loses the event object with its properties.
				var mouse = {
					x: event.data.$.clientX,
					y: event.data.$.clientY
				};

				checkMouseTimer = setTimeout( function() {
					checkMouse( mouse );
				}, 30 ); // balances performance and accessibility
			} );

			// This one removes box on scroll event.
			// It is to avoid box displacement.
			editable.attachListener( win, 'scroll', function() {
				if ( editor.mode != 'wysiwyg' )
					return;

				that.line.detach();

				// To figure this out just look at the mouseup
				// event handler below.
				if ( env.webkit ) {
					that.hiddenMode = 1;

					clearTimeout( scrollTimeout );
					scrollTimeout = setTimeout( function() {
						// Don't leave hidden mode until mouse remains pressed and
						// scroll is being used, i.e. when dragging something.
						if ( !that.mouseDown )
							that.hiddenMode = 0;
					}, 50 );

				}
			} );

			// Those event handlers remove the box on mousedown
			// and don't reveal it until the mouse is released.
			// It is to prevent box insertion e.g. while scrolling
			// (w/ scrollbar), selecting and so on.
			editable.attachListener( env_ie8 ? doc : win, 'mousedown', function() {
				if ( editor.mode != 'wysiwyg' )
					return;

				that.line.detach();
				that.hiddenMode = 1;
				that.mouseDown = 1;

			} );

			// Google Chrome doesn't trigger this on the scrollbar (since 2009...)
			// so it is totally useless to check for scroll finish
			// see: http://code.google.com/p/chromium/issues/detail?id=14204
			editable.attachListener( env_ie8 ? doc : win, 'mouseup', function() {
				that.hiddenMode = 0;
				that.mouseDown = 0;
			} );

			// Editor commands for accessing difficult focus spaces.
			editor.addCommand( 'accessPreviousSpace', accessFocusSpaceCmd( that ) );
			editor.addCommand( 'accessNextSpace', accessFocusSpaceCmd( that, true ) );

			editor.setKeystroke( [
				[ config.magicline_keystrokePrevious, 'accessPreviousSpace' ],
				[ config.magicline_keystrokeNext, 'accessNextSpace' ]
			] );

			// Revert magicline hot node on undo/redo.
			editor.on( 'loadSnapshot', function() {
				var elements, element, i;

				for ( var t in { p: 1, br: 1, div: 1 } ) {
					// document.find is not available in QM (https://dev.ckeditor.com/ticket/11149).
					elements = editor.document.getElementsByTag( t );

					for ( i = elements.count(); i--; ) {
						if ( ( element = elements.getItem( i ) ).data( 'cke-magicline-hot' ) ) {
							// Restore hotNode
							that.hotNode = element;
							// Restore last access direction
							that.lastCmdDirection = element.data( 'cke-magicline-dir' ) === 'true' ? true : false;

							return;
						}
					}
				}
			} );

			// This method handles mousemove mouse for box toggling.
			// It uses mouse position to determine underlying element, then
			// it tries to use different trigger type in order to place the box
			// in correct place. The following procedure is executed periodically.
			function checkMouse( mouse ) {

				that.mouse = mouse;
				that.trigger = null;

				checkMouseTimer = null;
				updateWindowSize( that );

				if (
					checkMouseTimeoutPending &&								// There must be an event pending.
					!that.hiddenMode &&										// Can't be in hidden mode.
					editor.focusManager.hasFocus &&							// Editor must have focus.
					!that.line.mouseNear() &&								// Mouse pointer can't be close to the box.
					( that.element = elementFromMouse( that, true ) )		// There must be valid element.
				) {
					// If trigger exists, and trigger is correct -> show the box.
					// Don't show the line if trigger is a descendant of some tabu-list element.
					if ( ( that.trigger = triggerEditable( that ) || triggerEdge( that ) || triggerExpand( that ) ) &&
						!isInTabu( that, that.trigger.upper || that.trigger.lower ) ) {
						that.line.attach().place();
					}

					// Otherwise remove the box
					else {
						that.trigger = null;
						that.line.detach();
					}


					checkMouseTimeoutPending = false;
				}

			}

			// This one allows testing and debugging. It reveals some
			// inner methods to the world.
			editor._.magiclineBackdoor = {
				accessFocusSpace: accessFocusSpace,
				boxTrigger: boxTrigger,
				isLine: isLine,
				getAscendantTrigger: getAscendantTrigger,
				getNonEmptyNeighbour: getNonEmptyNeighbour,
				getSize: getSize,
				that: that,
				triggerEdge: triggerEdge,
				triggerEditable: triggerEditable,
				triggerExpand: triggerExpand
			};
		}
	}

	// Some shorthands for common methods to save bytes
	var extend = CKEDITOR.tools.extend,
		newElement = CKEDITOR.dom.element,
		newElementFromHtml = newElement.createFromHtml,
		env = CKEDITOR.env,
		env_ie8 = CKEDITOR.env.ie && CKEDITOR.env.version < 9,
		dtd = CKEDITOR.dtd,

		// Global object associating enter modes with elements.
		enterElements = {},

		// Constant values, types and so on.
		EDGE_TOP = 128,
		EDGE_BOTTOM = 64,
		EDGE_MIDDLE = 32,
		TYPE_EDGE = 16,
		TYPE_EXPAND = 8,
		LOOK_TOP = 4,
		LOOK_BOTTOM = 2,
		LOOK_NORMAL = 1,
		WHITE_SPACE = '\u00A0',
		DTD_LISTITEM = dtd.$listItem,
		DTD_TABLECONTENT = dtd.$tableContent,
		DTD_NONACCESSIBLE = extend( {}, dtd.$nonEditable, dtd.$empty ),
		DTD_BLOCK = dtd.$block,

		// Minimum time that must elapse between two update*Size calls.
		// It prevents constant getComuptedStyle calls and improves performance.
		CACHE_TIME = 100,

		// Shared CSS stuff for box elements
		CSS_COMMON = 'width:0px;height:0px;padding:0px;margin:0px;display:block;' + 'z-index:9999;color:#fff;position:absolute;font-size: 0px;line-height:0px;',
		CSS_TRIANGLE = CSS_COMMON + 'border-color:transparent;display:block;border-style:solid;',
		TRIANGLE_HTML = '<span>' + WHITE_SPACE + '</span>';

	enterElements[ CKEDITOR.ENTER_BR ] = 'br';
	enterElements[ CKEDITOR.ENTER_P ] = 'p';
	enterElements[ CKEDITOR.ENTER_DIV ] = 'div';

	function areSiblings( that, upper, lower ) {
		return isHtml( upper ) && isHtml( lower ) && lower.equals( upper.getNext( function( node ) {
			return !( isEmptyTextNode( node ) || isComment( node ) || isFlowBreaker( node ) );
		} ) );
	}

	// boxTrigger is an abstract type which describes
	// the relationship between elements that may result
	// in showing the box.
	//
	// The following type is used by numerous methods
	// to share information about the hypothetical box placement
	// and look by referring to boxTrigger properties.
	function boxTrigger( triggerSetup ) {
		this.upper = triggerSetup[ 0 ];
		this.lower = triggerSetup[ 1 ];
		this.set.apply( this, triggerSetup.slice( 2 ) );
	}

	boxTrigger.prototype = {
		set: function( edge, type, look ) {
			this.properties = edge + type + ( look || LOOK_NORMAL );
			return this;
		},

		is: function( property ) {
			return ( this.properties & property ) == property;
		}
	};

	var elementFromMouse = ( function() {
		function elementFromPoint( doc, mouse ) {
			var pointedElement = doc.$.elementFromPoint( mouse.x, mouse.y );

			// IE9QM: from times to times it will return an empty object on scroll bar hover. (https://dev.ckeditor.com/ticket/12185)
			return pointedElement && pointedElement.nodeType ?
				new CKEDITOR.dom.element( pointedElement ) :
				null;
		}

		return function( that, ignoreBox, forceMouse ) {
			if ( !that.mouse )
				return null;

			var doc = that.doc,
				lineWrap = that.line.wrap,
				mouse = forceMouse || that.mouse,
				// Note: element might be null.
				element = elementFromPoint( doc, mouse );

			// If ignoreBox is set and element is the box, it means that we
			// need to hide the box for a while, repeat elementFromPoint
			// and show it again.
			if ( ignoreBox && isLine( that, element ) ) {
				lineWrap.hide();
				element = elementFromPoint( doc, mouse );
				lineWrap.show();
			}

			// Return nothing if:
			//	\-> Element is not HTML.
			if ( !( element && element.type == CKEDITOR.NODE_ELEMENT && element.$ ) )
				return null;

			// Also return nothing if:
			//	\-> We're IE<9 and element is out of the top-level element (editable for inline and HTML for classic (`iframe`-based)).
			//		This is due to the bug which allows IE<9 firing mouse events on element
			//		with contenteditable=true while doing selection out (far, away) of the element.
			//		Thus we must always be sure that we stay in editable or HTML.
			if ( env.ie && env.version < 9 ) {
				if ( !( that.boundary.equals( element ) || that.boundary.contains( element ) ) )
					return null;
			}

			return element;
		};
	} )();

	// Gets the closest parent node that belongs to triggers group.
	function getAscendantTrigger( that ) {
		var node = that.element,
			trigger;

		if ( node && isHtml( node ) ) {
			trigger = node.getAscendant( that.triggers, true );

			// If trigger is an element, neither editable nor editable's ascendant.
			if ( trigger && that.editable.contains( trigger ) ) {
				// Check for closest editable limit.
				// Don't consider trigger as a limit as it may be nested editable (includeSelf=false) (https://dev.ckeditor.com/ticket/12009).
				var limit = getClosestEditableLimit( trigger );

				// Trigger in nested editable area.
				if ( limit.getAttribute( 'contenteditable' ) == 'true' )
					return trigger;
				// Trigger in non-editable area.
				else if ( limit.is( that.triggers ) )
					return limit;
				else
					return null;
			} else {
				return null;
			}
		}

		return null;
	}

	function getMidpoint( that, upper, lower ) {
		updateSize( that, upper );
		updateSize( that, lower );

		var upperSizeBottom = upper.size.bottom,
			lowerSizeTop = lower.size.top;

		return upperSizeBottom && lowerSizeTop ? 0 | ( upperSizeBottom + lowerSizeTop ) / 2 : upperSizeBottom || lowerSizeTop;
	}

	// Get nearest node (either text or HTML), but:
	//	\->	Omit all empty text nodes (containing white characters only).
	//	\-> Omit BR elements
	//	\-> Omit flow breakers.
	function getNonEmptyNeighbour( that, node, goBack ) {
		node = node[ goBack ? 'getPrevious' : 'getNext' ]( function( node ) {
			return ( isTextNode( node ) && !isEmptyTextNode( node ) ) ||
				( isHtml( node ) && !isFlowBreaker( node ) && !isLine( that, node ) );
		} );

		return node;
	}

	function inBetween( val, lower, upper ) {
		return val > lower && val < upper;
	}

	// Returns the closest ancestor that has contenteditable attribute.
	// Such ancestor is the limit of (non-)editable DOM branch that element
	// belongs to. This method omits editor editable.
	function getClosestEditableLimit( element, includeSelf ) {
		if ( element.data( 'cke-editable' ) )
			return null;

		if ( !includeSelf )
			element = element.getParent();

		while ( element ) {
			if ( element.data( 'cke-editable' ) )
				return null;

			if ( element.hasAttribute( 'contenteditable' ) )
				return element;

			element = element.getParent();
		}

		return null;
	}

	// Access space line consists of a few elements (spans):
	// 	\-> Line wrapper.
	// 	\-> Line.
	// 	\-> Line triangles: left triangle (LT), right triangle (RT).
	// 	\-> Button handler (BTN).
	//
	//	+--------------------------------------------------- line.wrap (span) -----+
	//	| +---------------------------------------------------- line (span) -----+ |
	//	| | +- LT \                                           +- BTN -+  / RT -+ | |
	//	| | |      \                                          |     | | /      | | |
	//	| | |      /                                          |  <__| | \      | | |
	//	| | +-----/                                           +-------+  \-----+ | |
	//	| +----------------------------------------------------------------------+ |
	//  +--------------------------------------------------------------------------+
	//
	function initLine( that ) {
		var doc = that.doc,
			// This the main box element that holds triangles and the insertion button
			line = newElementFromHtml( '<span contenteditable="false" data-cke-magic-line="1" style="' + CSS_COMMON + 'position:absolute;border-top:1px dashed ' + that.boxColor + '"></span>', doc ),
			iconPath = CKEDITOR.getUrl( this.path + 'images/' + ( env.hidpi ? 'hidpi/' : '' ) + 'icon' + ( that.rtl ? '-rtl' : '' ) + '.png' );

		extend( line, {

			attach: function() {
				// Only if not already attached
				if ( !this.wrap.getParent() )
					this.wrap.appendTo( that.editable, true );

				return this;
			},

			// Looks are as follows: [ LOOK_TOP, LOOK_BOTTOM, LOOK_NORMAL ].
			lineChildren: [
				extend(
					newElementFromHtml(
						'<span title="' + that.editor.lang.magicline.title +
						'" contenteditable="false">&#8629;</span>', doc
					), {
						base: CSS_COMMON + 'height:17px;width:17px;' + ( that.rtl ? 'left' : 'right' ) + ':17px;' +
								'background:url(' + iconPath + ') center no-repeat ' + that.boxColor + ';cursor:pointer;' +
								( env.hc ? 'font-size: 15px;line-height:14px;border:1px solid #fff;text-align:center;' : '' ) +
								( env.hidpi ? 'background-size: 9px 10px;' : '' ),
						looks: [
							'top:-8px; border-radius: 2px;',
							'top:-17px; border-radius: 2px 2px 0px 0px;',
							'top:-1px; border-radius: 0px 0px 2px 2px;'
						]
					}
				),
				extend( newElementFromHtml( TRIANGLE_HTML, doc ), {
					base: CSS_TRIANGLE + 'left:0px;border-left-color:' + that.boxColor + ';',
					looks: [
						'border-width:8px 0 8px 8px;top:-8px',
						'border-width:8px 0 0 8px;top:-8px',
						'border-width:0 0 8px 8px;top:0px'
					]
				} ),
				extend( newElementFromHtml( TRIANGLE_HTML, doc ), {
					base: CSS_TRIANGLE + 'right:0px;border-right-color:' + that.boxColor + ';',
					looks: [
						'border-width:8px 8px 8px 0;top:-8px',
						'border-width:8px 8px 0 0;top:-8px',
						'border-width:0 8px 8px 0;top:0px'
					]
				} )
			],

			detach: function() {
				// Detach only if already attached.
				if ( this.wrap.getParent() )
					this.wrap.remove();

				return this;
			},

			// Checks whether mouseY is around an element by comparing boundaries and considering
			// an offset distance.
			mouseNear: function() {

				updateSize( that, this );
				var offset = that.holdDistance,
					size = this.size;

				// Determine neighborhood by element dimensions and offsets.
				if ( size && inBetween( that.mouse.y, size.top - offset, size.bottom + offset ) && inBetween( that.mouse.x, size.left - offset, size.right + offset ) ) {
					return true;
				}

				return false;
			},

			// Adjusts position of the box according to the trigger properties.
			// If also affects look of the box depending on the type of the trigger.
			place: function() {
				var view = that.view,
					editable = that.editable,
					trigger = that.trigger,
					upper = trigger.upper,
					lower = trigger.lower,
					any = upper || lower,
					parent = any.getParent(),
					styleSet = {};

				// Save recent trigger for further insertion.
				// It is necessary due to the fact, that that.trigger may
				// contain different boxTrigger at the moment of insertion
				// or may be even null.
				this.trigger = trigger;

				upper && updateSize( that, upper, true );
				lower && updateSize( that, lower, true );
				updateSize( that, parent, true );

				// Yeah, that's gonna be useful in inline-mode case.
				if ( that.inInlineMode )
					updateEditableSize( that, true );

				// Set X coordinate (left, right, width).
				if ( parent.equals( editable ) ) {
					styleSet.left = view.scroll.x;
					styleSet.right = -view.scroll.x;
					styleSet.width = '';
				} else {
					styleSet.left = any.size.left - any.size.margin.left + view.scroll.x - ( that.inInlineMode ? view.editable.left + view.editable.border.left : 0 );
					styleSet.width = any.size.outerWidth + any.size.margin.left + any.size.margin.right + view.scroll.x;
					styleSet.right = '';
				}

				// Set Y coordinate (top) for trigger consisting of two elements.
				if ( upper && lower ) {
					// No margins at all or they're equal. Place box right between.
					if ( upper.size.margin.bottom === lower.size.margin.top )
						styleSet.top = 0 | ( upper.size.bottom + upper.size.margin.bottom / 2 );
					else {
						// Upper margin < lower margin. Place at lower margin.
						if ( upper.size.margin.bottom < lower.size.margin.top )
							styleSet.top = upper.size.bottom + upper.size.margin.bottom;
						// Upper margin > lower margin. Place at upper margin - lower margin.
						else
							styleSet.top = upper.size.bottom + upper.size.margin.bottom - lower.size.margin.top;
					}
				}
				// Set Y coordinate (top) for single-edge trigger.
				else if ( !upper )
					styleSet.top = lower.size.top - lower.size.margin.top;
				else if ( !lower ) {
					styleSet.top = upper.size.bottom + upper.size.margin.bottom;
				}

				// Set box button modes if close to the viewport horizontal edge
				// or look forced by the trigger.
				if ( trigger.is( LOOK_TOP ) || inBetween( styleSet.top, view.scroll.y - 15, view.scroll.y + 5 ) ) {
					styleSet.top = that.inInlineMode ? 0 : view.scroll.y;
					this.look( LOOK_TOP );
				} else if ( trigger.is( LOOK_BOTTOM ) || inBetween( styleSet.top, view.pane.bottom - 5, view.pane.bottom + 15 ) ) {
					styleSet.top = that.inInlineMode ? (
							view.editable.height + view.editable.padding.top + view.editable.padding.bottom
						) : (
							view.pane.bottom - 1
						);

					this.look( LOOK_BOTTOM );
				} else {
					if ( that.inInlineMode )
						styleSet.top -= view.editable.top + view.editable.border.top;

					this.look( LOOK_NORMAL );
				}

				if ( that.inInlineMode ) {
					// 1px bug here...
					styleSet.top--;

					// Consider the editable to be an element with overflow:scroll
					// and non-zero scrollTop/scrollLeft value.
					// For example: divarea editable. (https://dev.ckeditor.com/ticket/9383)
					styleSet.top += view.editable.scroll.top;
					styleSet.left += view.editable.scroll.left;
				}

				// Append `px` prefixes.
				for ( var style in styleSet )
					styleSet[ style ] = CKEDITOR.tools.cssLength( styleSet[ style ] );

				this.setStyles( styleSet );
			},

			// Changes look of the box according to current needs.
			// Three different styles are available: [ LOOK_TOP, LOOK_BOTTOM, LOOK_NORMAL ].
			look: function( look ) {
				if ( this.oldLook == look )
					return;

				for ( var i = this.lineChildren.length, child; i--; )
					( child = this.lineChildren[ i ] ).setAttribute( 'style', child.base + child.looks[ 0 | look / 2 ] );

				this.oldLook = look;
			},

			wrap: new newElement( 'span', that.doc )

		} );

		// Insert children into the box.
		for ( var i = line.lineChildren.length; i--; )
			line.lineChildren[ i ].appendTo( line );

		// Set default look of the box.
		line.look( LOOK_NORMAL );

		// Using that wrapper prevents IE (8,9) from resizing editable area at the moment
		// of box insertion. This works thanks to the fact, that positioned box is wrapped by
		// an inline element. So much tricky.
		line.appendTo( line.wrap );

		// Make the box unselectable.
		line.unselectable();

		// Handle accessSpace node insertion.
		line.lineChildren[ 0 ].on( 'mouseup', function( event ) {
			line.detach();

			accessFocusSpace( that, function( accessNode ) {
				// Use old trigger that was saved by 'place' method. Look: line.place
				var trigger = that.line.trigger;

				accessNode[ trigger.is( EDGE_TOP ) ? 'insertBefore' : 'insertAfter' ](
					trigger.is( EDGE_TOP ) ? trigger.lower : trigger.upper );
			}, true );

			that.editor.focus();

			if ( !env.ie && that.enterMode != CKEDITOR.ENTER_BR )
				that.hotNode.scrollIntoView();

			event.data.preventDefault( true );
		} );

		// Prevents IE9 from displaying the resize box and disables drag'n'drop functionality.
		line.on( 'mousedown', function( event ) {
			event.data.preventDefault( true );
		} );

		that.line = line;
	}

	// This function allows accessing any focus space according to the insert function:
	// 	* For enterMode ENTER_P it creates P element filled with dummy white-space.
	// 	* For enterMode ENTER_DIV it creates DIV element filled with dummy white-space.
	// 	* For enterMode ENTER_BR it creates BR element or &nbsp; in IE.
	//
	// The node is being inserted according to insertFunction. Finally the method
	// selects the non-breaking space making the node ready for typing.
	function accessFocusSpace( that, insertFunction, doSave ) {
		var range = new CKEDITOR.dom.range( that.doc ),
			editor = that.editor,
			accessNode;

		// IE requires text node of &nbsp; in ENTER_BR mode.
		if ( env.ie && that.enterMode == CKEDITOR.ENTER_BR )
			accessNode = that.doc.createText( WHITE_SPACE );

		// In other cases a regular element is used.
		else {
			// Use the enterMode of editable's limit or editor's
			// enter mode if not in nested editable.
			var limit = getClosestEditableLimit( that.element, true ),

				// This is an enter mode for the context. We cannot use
				// editor.activeEnterMode because the focused nested editable will
				// have a different enterMode as editor but magicline will be inserted
				// directly into editor's editable.
				enterMode = limit && limit.data( 'cke-enter-mode' ) || that.enterMode;

			accessNode = new newElement( enterElements[ enterMode ], that.doc );

			if ( !accessNode.is( 'br' ) ) {
				var dummy = that.doc.createText( WHITE_SPACE );
				dummy.appendTo( accessNode );
			}
		}

		doSave && editor.fire( 'saveSnapshot' );

		insertFunction( accessNode );
		//dummy.appendTo( accessNode );
		range.moveToPosition( accessNode, CKEDITOR.POSITION_AFTER_START );
		editor.getSelection().selectRanges( [ range ] );
		that.hotNode = accessNode;

		doSave && editor.fire( 'saveSnapshot' );
	}

	// Access focus space on demand by taking an element under the caret as a reference.
	// The space is accessed provided the element under the caret is trigger AND:
	//
	//  1. First/last-child of its parent:
	//		+----------------------- Parent element -+
	//		| +------------------------------ DIV -+ |	<-- Access before
	//		| | Foo^                               | |
	//		| |                                    | |
	//		| +------------------------------------+ |	<-- Access after
	//		+----------------------------------------+
	//
	//                       OR
	//
	//  2. It has a direct sibling element, which is also a trigger:
	//		+-------------------------------- DIV#1 -+
	//		| Foo^                                   |
	//		|                                        |
	//		+----------------------------------------+
	//                                                	<-- Access here
	//		+-------------------------------- DIV#2 -+
	//		| Bar                                    |
	//		|                                        |
	//		+----------------------------------------+
	//
	//                       OR
	//
	//  3. It has a direct sibling, which is a trigger and has a valid neighbour trigger,
	//     but belongs to dtd.$.empty/nonEditable:
	//		+------------------------------------ P -+
	//		| Foo^                                   |
	//		|                                        |
	//		+----------------------------------------+
	//		+----------------------------------- HR -+
	//                                                	<-- Access here
	//		+-------------------------------- DIV#2 -+
	//		| Bar                                    |
	//		|                                        |
	//		+----------------------------------------+
	//
	function accessFocusSpaceCmd( that, insertAfter ) {
		return {
			canUndo: true,
			modes: { wysiwyg: 1 },
			exec: ( function() {

				// Inserts line (accessNode) at the position by taking target node as a reference.
				function doAccess( target ) {
					// Remove old hotNode under certain circumstances.
					var hotNodeChar = ( env.ie && env.version < 9 ? ' ' : WHITE_SPACE ),
						removeOld = that.hotNode &&							// Old hotNode must exist.
							that.hotNode.getText() == hotNodeChar &&		// Old hotNode hasn't been changed.
							that.element.equals( that.hotNode ) &&			// Caret is inside old hotNode.
							// Command is executed in the same direction.
							that.lastCmdDirection === !!insertAfter; // jshint ignore:line

					accessFocusSpace( that, function( accessNode ) {
						if ( removeOld && that.hotNode )
							that.hotNode.remove();

						accessNode[ insertAfter ? 'insertAfter' : 'insertBefore' ]( target );

						// Make this element distinguishable. Also remember the direction
						// it's been inserted into document.
						accessNode.setAttributes( {
							'data-cke-magicline-hot': 1,
							'data-cke-magicline-dir': !!insertAfter
						} );

						// Save last direction of the command (is insertAfter?).
						that.lastCmdDirection = !!insertAfter;
					} );

					if ( !env.ie && that.enterMode != CKEDITOR.ENTER_BR )
						that.hotNode.scrollIntoView();

					// Detach the line if was visible (previously triggered by mouse).
					that.line.detach();
				}

				return function( editor ) {
					var selected = editor.getSelection().getStartElement(),
						limit;

					// (https://dev.ckeditor.com/ticket/9833) Go down to the closest non-inline element in DOM structure
					// since inline elements don't participate in in magicline.
					selected = selected.getAscendant( DTD_BLOCK, 1 );

					// Stop if selected is a child of a tabu-list element.
					if ( isInTabu( that, selected ) )
						return;

					// Sometimes it may happen that there's no parent block below selected element
					// or, for example, getAscendant reaches editable or editable parent.
					// We must avoid such pathological cases.
					if ( !selected || selected.equals( that.editable ) || selected.contains( that.editable ) )
						return;

					// Executing the command directly in nested editable should
					// access space before/after it.
					if ( ( limit = getClosestEditableLimit( selected ) ) && limit.getAttribute( 'contenteditable' ) == 'false' )
						selected = limit;

					// That holds element from mouse. Replace it with the
					// element under the caret.
					that.element = selected;

					// (3.) Handle the following cases where selected neighbour
					// is a trigger inaccessible for the caret AND:
					//	- Is first/last-child
					//	OR
					//	- Has a sibling, which is also a trigger.
					var neighbor = getNonEmptyNeighbour( that, selected, !insertAfter ),
						neighborSibling;

					// Check for a neighbour that belongs to triggers.
					// Consider only non-accessible elements (they cannot have any children)
					// since they cannot be given a caret inside, to run the command
					// the regular way (1. & 2.).
					if (
						isHtml( neighbor ) && neighbor.is( that.triggers ) && neighbor.is( DTD_NONACCESSIBLE ) &&
						(
							// Check whether neighbor is first/last-child.
							!getNonEmptyNeighbour( that, neighbor, !insertAfter ) ||
							// Check for a sibling of a neighbour that also is a trigger.
							(
								( neighborSibling = getNonEmptyNeighbour( that, neighbor, !insertAfter ) ) &&
								isHtml( neighborSibling ) &&
								neighborSibling.is( that.triggers )
							)
						)
					) {
						doAccess( neighbor );
						return;
					}

					// Look for possible target element DOWN "selected" DOM branch (towards editable)
					// that belong to that.triggers
					var target = getAscendantTrigger( that, selected );

					// No HTML target -> no access.
					if ( !isHtml( target ) )
						return;

					// (1.) Target is first/last child -> access.
					if ( !getNonEmptyNeighbour( that, target, !insertAfter ) ) {
						doAccess( target );
						return;
					}

					var sibling = getNonEmptyNeighbour( that, target, !insertAfter );

					// (2.) Target has a sibling that belongs to that.triggers -> access.
					if ( sibling && isHtml( sibling ) && sibling.is( that.triggers ) ) {
						doAccess( target );
						return;
					}
				};
			} )()
		};
	}

	function isLine( that, node ) {
		if ( !( node && node.type == CKEDITOR.NODE_ELEMENT && node.$ ) )
			return false;

		var line = that.line;

		return line.wrap.equals( node ) || line.wrap.contains( node );
	}

	// Is text node containing white-spaces only?
	var isEmptyTextNode = CKEDITOR.dom.walker.whitespaces();

	// Is fully visible HTML node?
	function isHtml( node ) {
		return node && node.type == CKEDITOR.NODE_ELEMENT && node.$;	// IE requires that
	}

	function isFloated( element ) {
		if ( !isHtml( element ) )
			return false;

		var options = { left: 1, right: 1, center: 1 };

		return !!( options[ element.getComputedStyle( 'float' ) ] || options[ element.getAttribute( 'align' ) ] );
	}

	function isFlowBreaker( element ) {
		if ( !isHtml( element ) )
			return false;

		return isPositioned( element ) || isFloated( element );
	}

	// Isn't node of NODE_COMMENT type?
	var isComment = CKEDITOR.dom.walker.nodeType( CKEDITOR.NODE_COMMENT );

	function isPositioned( element ) {
		return !!{ absolute: 1, fixed: 1 }[ element.getComputedStyle( 'position' ) ];
	}

	// Is text node?
	function isTextNode( node ) {
		return node && node.type == CKEDITOR.NODE_TEXT;
	}

	function isTrigger( that, element ) {
		return isHtml( element ) ? element.is( that.triggers ) : null;
	}

	function isInTabu( that, element ) {
		if ( !element )
			return false;

		var parents = element.getParents( 1 );

		for ( var i = parents.length ; i-- ; ) {
			for ( var j = that.tabuList.length ; j-- ; ) {
				if ( parents[ i ].hasAttribute( that.tabuList[ j ] ) )
					return true;
			}
		}

		return false;
	}

	// This function checks vertically is there's a relevant child between element's edge
	// and the pointer.
	//	\-> Table contents are omitted.
	function isChildBetweenPointerAndEdge( that, parent, edgeBottom ) {
		var edgeChild = parent[ edgeBottom ? 'getLast' : 'getFirst' ]( function( node ) {
			return that.isRelevant( node ) && !node.is( DTD_TABLECONTENT );
		} );

		if ( !edgeChild )
			return false;

		updateSize( that, edgeChild );

		return edgeBottom ? edgeChild.size.top > that.mouse.y : edgeChild.size.bottom < that.mouse.y;
	}

	// This method handles edge cases:
	// 	\-> Mouse is around upper or lower edge of view pane.
	// 	\-> Also scroll position is either minimal or maximal.
	// 	\-> It's OK to show LOOK_TOP(BOTTOM) type line.
	//
	// This trigger doesn't need additional post-filtering.
	//
	//	+----------------------------- Editable -+  /--
	//	| +---------------------- First child -+ |  | <-- Top edge (first child)
	//	| |                                    | |  |
	//	| |                                    | |  |	 * Mouse activation area *
	//	| |                                    | |  |
	//	| |                 ...                | |	\-- Top edge + trigger offset
	//	| .                                    . |
	//	|                                        |
	//	| .                                    . |
	//	| |                 ...                | |  /-- Bottom edge - trigger offset
	//	| |                                    | |  |
	//	| |                                    | |  |	 * Mouse activation area *
	//	| |                                    | |  |
	//	| +----------------------- Last child -+ |  | <-- Bottom edge (last child)
	//	+----------------------------------------+  \--
	//
	function triggerEditable( that ) {

		var editable = that.editable,
			mouse = that.mouse,
			view = that.view,
			triggerOffset = that.triggerOffset,
			triggerLook;

		// Update editable dimensions.
		updateEditableSize( that );

		// This flag determines whether checking bottom trigger.
		var bottomTrigger = mouse.y > (
				that.inInlineMode ? (
					view.editable.top + view.editable.height / 2
				) : (
					// This is to handle case when editable.height / 2 <<< pane.height.
					Math.min( view.editable.height, view.pane.height ) / 2
				)
			),

		// Edge node according to bottomTrigger.
		edgeNode = editable[ bottomTrigger ? 'getLast' : 'getFirst' ]( function( node ) {
			return !( isEmptyTextNode( node ) || isComment( node ) );
		} );

		// There's no edge node. Abort.
		if ( !edgeNode ) {
			return null;
		}

		// If the edgeNode in editable is ML, get the next one.
		if ( isLine( that, edgeNode ) ) {
			edgeNode = that.line.wrap[ bottomTrigger ? 'getPrevious' : 'getNext' ]( function( node ) {
				return !( isEmptyTextNode( node ) || isComment( node ) );
			} );
		}

		// Exclude bad nodes (no ML needed then):
		//	\-> Edge node is text.
		//	\-> Edge node is floated, etc.
		//
		// Edge node *must be* a valid trigger at this stage as well.
		if ( !isHtml( edgeNode ) || isFlowBreaker( edgeNode ) || !isTrigger( that, edgeNode ) ) {
			return null;
		}

		// Update size of edge node. Dimensions will be necessary.
		updateSize( that, edgeNode );

		// Return appropriate trigger according to bottomTrigger.
		// \->	Top edge trigger case first.
		if ( !bottomTrigger &&													// Top trigger case.
			edgeNode.size.top >= 0 &&											// Check if the first element is fully visible.
			inBetween( mouse.y, 0, edgeNode.size.top + triggerOffset ) ) {		// Check if mouse in [0, edgeNode.top + triggerOffset].

			// Determine trigger look.
			triggerLook = that.inInlineMode || view.scroll.y === 0 ?
				LOOK_TOP : LOOK_NORMAL;


			return new boxTrigger( [ null, edgeNode,
				EDGE_TOP,
				TYPE_EDGE,
				triggerLook
			] );
		}

		// \->	Bottom case.
		else if ( bottomTrigger &&
			edgeNode.size.bottom <= view.pane.height &&							// Check if the last element is fully visible
			inBetween( mouse.y,													// Check if mouse in...
				edgeNode.size.bottom - triggerOffset, view.pane.height ) ) {	// [ edgeNode.bottom - triggerOffset, paneHeight ]

			// Determine trigger look.
			triggerLook = that.inInlineMode ||
				inBetween( edgeNode.size.bottom, view.pane.height - triggerOffset, view.pane.height ) ?
					LOOK_BOTTOM : LOOK_NORMAL;


			return new boxTrigger( [ edgeNode, null,
				EDGE_BOTTOM,
				TYPE_EDGE,
				triggerLook
			] );
		}

		return null;
	}

	// This method covers cases *inside* of an element:
	// 	\->	The pointer is in the top (bottom) area of an element and there's
	//		HTML node before (after) this element.
	// 	\-> An element being the first or last child of its parent.
	//
	//	+----------------------- Parent element -+
	//	| +----------------------- Element #1 -+ |  /--
	//	| |                                    | |  |	 * Mouse activation area (as first child) *
	//	| |                                    | |  \--
	//	| |                                    | |  /--
	//	| |                                    | |  |	 * Mouse activation area (Element #2) *
	//	| +------------------------------------+ |  \--
	//	|                                        |
	//	| +----------------------- Element #2 -+ |  /--
	//	| |                                    | |  |	 * Mouse activation area (Element #1) *
	//	| |                                    | |  \--
	//	| |                                    | |
	//	| +------------------------------------+ |
	//	|                                        |
	//	|            Text node is here.          |
	//	|                                        |
	//	| +----------------------- Element #3 -+ |
	//	| |                                    | |
	//	| |                                    | |
	//	| |                                    | |  /--
	//	| |                                    | |  |	 * Mouse activation area (as last child) *
	//	| +------------------------------------+ |  \--
	//	+----------------------------------------+
	//
	function triggerEdge( that ) {

		var mouse = that.mouse,
			view = that.view,
			triggerOffset = that.triggerOffset;

		// Get the ascendant trigger basing on elementFromMouse.
		var element = getAscendantTrigger( that );


		// Abort if there's no appropriate element.
		if ( !element ) {
			return null;
		}

		// Dimensions will be necessary.
		updateSize( that, element );

		// If triggerOffset is larger than a half of element's height,
		// use an offset of 1/2 of element's height. If the offset wasn't reduced,
		// top area would cover most (all) cases.
		var fixedOffset = Math.min( triggerOffset,
				0 | ( element.size.outerHeight / 2 ) ),

		// This variable will hold the trigger to be returned.
			triggerSetup = [],
			triggerLook,

		// This flag determines whether dealing with a bottom trigger.
			bottomTrigger;

		//	\-> Top trigger.
		if ( inBetween( mouse.y, element.size.top - 1, element.size.top + fixedOffset ) )
			bottomTrigger = false;
		//	\-> Bottom trigger.
		else if ( inBetween( mouse.y, element.size.bottom - fixedOffset, element.size.bottom + 1 ) )
			bottomTrigger = true;
		//	\-> Abort. Not in a valid trigger space.
		else {
			return null;
		}

		// Reject wrong elements.
		// 	\-> Reject an element which is a flow breaker.
		// 	\-> Reject an element which has a child above/below the mouse pointer.
		//	\-> Reject an element which belongs to list items.
		if (
			isFlowBreaker( element ) ||
			isChildBetweenPointerAndEdge( that, element, bottomTrigger ) ||
			element.getParent().is( DTD_LISTITEM )
		) {
			return null;
		}

		// Get sibling according to bottomTrigger.
		var elementSibling = getNonEmptyNeighbour( that, element, !bottomTrigger );

		// No sibling element.
		// This is a first or last child case.
		if ( !elementSibling ) {
			// No need to reject the element as it has already been done before.
			// Prepare a trigger.

			// Determine trigger look.
			if ( element.equals( that.editable[ bottomTrigger ? 'getLast' : 'getFirst' ]( that.isRelevant ) ) ) {
				updateEditableSize( that );

				if (
					bottomTrigger && inBetween( mouse.y,
					element.size.bottom - fixedOffset, view.pane.height ) &&
					inBetween( element.size.bottom, view.pane.height - fixedOffset, view.pane.height )
				) {
					triggerLook = LOOK_BOTTOM;
				} else if ( inBetween( mouse.y, 0, element.size.top + fixedOffset ) ) {
					triggerLook = LOOK_TOP;
				}
			} else {
				triggerLook = LOOK_NORMAL;
			}

			triggerSetup = [ null, element ][ bottomTrigger ? 'reverse' : 'concat' ]().concat( [
				bottomTrigger ? EDGE_BOTTOM : EDGE_TOP,
				TYPE_EDGE,
				triggerLook,
				element.equals( that.editable[ bottomTrigger ? 'getLast' : 'getFirst' ]( that.isRelevant ) ) ?
						( bottomTrigger ? LOOK_BOTTOM : LOOK_TOP ) : LOOK_NORMAL
			] );

		}

		// Abort. Sibling is a text element.
		else if ( isTextNode( elementSibling ) ) {
			return null;
		}

		// Check if the sibling is a HTML element.
		// If so, create an TYPE_EDGE, EDGE_MIDDLE trigger.
		else if ( isHtml( elementSibling ) ) {
			// Reject wrong elementSiblings.
			// 	\-> Reject an elementSibling which is a flow breaker.
			//	\-> Reject an elementSibling which isn't a trigger.
			//	\-> Reject an elementSibling which belongs to list items.
			if (
				isFlowBreaker( elementSibling ) ||
				!isTrigger( that, elementSibling ) ||
				elementSibling.getParent().is( DTD_LISTITEM )
			) {
				return null;
			}

			// Prepare a trigger.
			triggerSetup = [ elementSibling, element ][ bottomTrigger ? 'reverse' : 'concat' ]().concat( [
				EDGE_MIDDLE,
				TYPE_EDGE
			] );

		}

		if ( 0 in triggerSetup ) {
			return new boxTrigger( triggerSetup );
		}

		return null;
	}

	// Checks iteratively up and down in search for elements using elementFromMouse method.
	// Useful if between two triggers.
	//
	//	+----------------------- Parent element -+
	//	| +----------------------- Element #1 -+ |
	//	| |                                    | |
	//	| |                                    | |
	//	| |                                    | |
	//	| +------------------------------------+ |
	//	|                                        |  /--
	//	|                  .                     |  |
	//	|                  .      +-- Floated -+ |  |
	//	|                  |      |            | |  |	* Mouse activation area *
	//	|                  |      |   IGNORE   | |  |
	//	|                  X      |            | |  |	Method searches vertically for sibling elements.
	//	|                  |      +------------+ |  |	Start point is X (mouse-y coordinate).
	//	|                  |                     |  |	Floated elements, comments and empty text nodes are omitted.
	//	|                  .                     |  |
	//	|                  .                     |  |
	//	|                                        |  \--
	//	| +----------------------- Element #2 -+ |
	//	| |                                    | |
	//	| |                                    | |
	//	| |                                    | |
	//	| |                                    | |
	//	| +------------------------------------+ |
	//	+----------------------------------------+
	//
	var triggerExpand = ( function() {
		// The heart of the procedure. This method creates triggers that are
		// filtered by expandFilter method.
		function expandEngine( that ) {

			var startElement = that.element,
				upper, lower, trigger;

			if ( !isHtml( startElement ) || startElement.contains( that.editable ) ) {
				return null;
			}

			// Stop searching if element is in non-editable branch of DOM.
			if ( startElement.isReadOnly() )
				return null;

			trigger = verticalSearch( that,
				function( current, startElement ) {
					return !startElement.equals( current );	// stop when start element and the current one differ
				}, function( that, mouse ) {
					return elementFromMouse( that, true, mouse );
				}, startElement ),

			upper = trigger.upper,
			lower = trigger.lower;


			// Success: two siblings have been found
			if ( areSiblings( that, upper, lower ) ) {
				return trigger.set( EDGE_MIDDLE, TYPE_EXPAND );
			}


			// Danger. Dragons ahead.
			// No siblings have been found during previous phase, post-processing may be necessary.
			// We can traverse DOM until a valid pair of elements around the pointer is found.

			// Prepare for post-processing:
			// 	1. Determine if upper and lower are children of startElement.
			// 		1.1. If so, find their ascendants that are closest to startElement (one level deeper than startElement).
			// 		1.2. Otherwise use first/last-child of the startElement as upper/lower. Why?:
			// 			a) 	upper/lower belongs to another branch of the DOM tree.
			// 			b) 	verticalSearch encountered an edge of the viewport and failed.
			// 		1.3. Make sure upper and lower still exist. Why?:
			// 			a) 	Upper and lower may be not belong to the branch of the startElement (may not exist at all) and
			// 				startElement has no children.
			// 	2. Perform the post-processing.
			// 		2.1. Gather dimensions of an upper element.
			// 		2.2. Abort if lower edge of upper is already under the mouse pointer. Why?:
			// 			a) 	We expect upper to be above and lower below the mouse pointer.
			// 	3. Perform iterative search while upper != lower.
			// 		3.1. Find the upper-next element. If there's no such element, break current search. Why?:
			// 			a)	There's no point in further search if there are only text nodes ahead.
			// 		3.2. Calculate the distance between the middle point of ( upper, upperNext ) and mouse-y.
			// 		3.3. If the distance is shorter than the previous best, save it (save upper, upperNext as well).
			// 		3.4. If the optimal pair is found, assign it back to the trigger.

			// 1.1., 1.2.
			if ( upper && startElement.contains( upper ) ) {
				while ( !upper.getParent().equals( startElement ) )
					upper = upper.getParent();
			} else {
				upper = startElement.getFirst( function( node ) {
					return expandSelector( that, node );
				} );
			}

			if ( lower && startElement.contains( lower ) ) {
				while ( !lower.getParent().equals( startElement ) )
					lower = lower.getParent();
			} else {
				lower = startElement.getLast( function( node ) {
					return expandSelector( that, node );
				} );
			}

			// 1.3.
			if ( !upper || !lower ) {
				return null;
			}

			// 2.1.
			updateSize( that, upper );
			updateSize( that, lower );

			if ( !checkMouseBetweenElements( that, upper, lower ) ) {
				return null;
			}

			var minDistance = Number.MAX_VALUE,
				currentDistance, upperNext, minElement, minElementNext;

			while ( lower && !lower.equals( upper ) ) {
				// 3.1.
				if ( !( upperNext = upper.getNext( that.isRelevant ) ) )
					break;

				// 3.2.
				currentDistance = Math.abs( getMidpoint( that, upper, upperNext ) - that.mouse.y );

				// 3.3.
				if ( currentDistance < minDistance ) {
					minDistance = currentDistance;
					minElement = upper;
					minElementNext = upperNext;
				}

				upper = upperNext;
				updateSize( that, upper );
			}


			// 3.4.
			if ( !minElement || !minElementNext ) {
				return null;
			}

			if ( !checkMouseBetweenElements( that, minElement, minElementNext ) ) {
				return null;
			}

			// An element of minimal distance has been found. Assign it to the trigger.
			trigger.upper = minElement;
			trigger.lower = minElementNext;

			// Success: post-processing revealed a pair of elements.
			return trigger.set( EDGE_MIDDLE, TYPE_EXPAND );
		}

		// This is default element selector used by the engine.
		function expandSelector( that, node ) {
			return !( isTextNode( node ) ||
				isComment( node ) ||
				isFlowBreaker( node ) ||
				isLine( that, node ) ||
				( node.type == CKEDITOR.NODE_ELEMENT && node.$ && node.is( 'br' ) ) );
		}

		// This method checks whether mouse-y is between the top edge of upper
		// and bottom edge of lower.
		//
		// NOTE: This method assumes that updateSize has already been called
		// for the elements and is up-to-date.
		//
		//	+---------------------------- Upper -+  /--
		//	|                                    |  |
		//	+------------------------------------+  |
		//                                          |
		//                     ...                  |
		//                                          |
		//						X                   |	* Return true for mouse-y in this range *
		//                                          |
		//                     ...                  |
		//                                          |
		//	+---------------------------- Lower -+  |
		//	|                                    |  |
		//	+------------------------------------+  \--
		//
		function checkMouseBetweenElements( that, upper, lower ) {
			return inBetween( that.mouse.y, upper.size.top, lower.size.bottom );
		}

		// A method for trigger filtering. Accepts or rejects trigger pairs
		// by their location in DOM etc.
		function expandFilter( that, trigger ) {

			var upper = trigger.upper,
				lower = trigger.lower;

			if (
				!upper || !lower ||											// NOT: EDGE_MIDDLE trigger ALWAYS has two elements.
				isFlowBreaker( lower ) || isFlowBreaker( upper ) ||			// NOT: one of the elements is floated or positioned
				lower.equals( upper ) || upper.equals( lower ) ||			// NOT: two trigger elements, one equals another.
				lower.contains( upper ) || upper.contains( lower )
			) {	// NOT: two trigger elements, one contains another.

				return false;
			}

			// YES: two trigger elements, pure siblings.
			else if ( isTrigger( that, upper ) && isTrigger( that, lower ) && areSiblings( that, upper, lower ) ) {

				return true;
			}


			return false;
		}

		// Simple wrapper for expandEngine and expandFilter.
		return function( that ) {

			var trigger = expandEngine( that );

			return trigger && expandFilter( that, trigger ) ? trigger : null;
		};
	} )();

	// Collects dimensions of an element.
	var sizePrefixes = [ 'top', 'left', 'right', 'bottom' ];

	function getSize( that, element, ignoreScroll, force ) {
		var docPosition = element.getDocumentPosition(),
			border = {},
			margin = {},
			padding = {},
			box = {};

		for ( var i = sizePrefixes.length; i--; ) {
			border[ sizePrefixes[ i ] ] = parseInt( getStyle( 'border-' + sizePrefixes[ i ] + '-width' ), 10 ) || 0;
			padding[ sizePrefixes[ i ] ] = parseInt( getStyle( 'padding-' + sizePrefixes[ i ] ), 10 ) || 0;
			margin[ sizePrefixes[ i ] ] = parseInt( getStyle( 'margin-' + sizePrefixes[ i ] ), 10 ) || 0;
		}

		// updateWindowSize if forced to do so OR NOT ignoring scroll.
		if ( !ignoreScroll || force )
			updateWindowSize( that, force );

		box.top = docPosition.y - ( ignoreScroll ? 0 : that.view.scroll.y ), box.left = docPosition.x - ( ignoreScroll ? 0 : that.view.scroll.x ),

		// w/ borders and paddings.
		box.outerWidth = element.$.offsetWidth, box.outerHeight = element.$.offsetHeight,

		// w/o borders and paddings.
		box.height = box.outerHeight - ( padding.top + padding.bottom + border.top + border.bottom ), box.width = box.outerWidth - ( padding.left + padding.right + border.left + border.right ),

		box.bottom = box.top + box.outerHeight, box.right = box.left + box.outerWidth;

		if ( that.inInlineMode ) {
			box.scroll = {
				top: element.$.scrollTop,
				left: element.$.scrollLeft
			};
		}

		return extend( {
			border: border,
			padding: padding,
			margin: margin,
			ignoreScroll: ignoreScroll
		}, box, true );

		function getStyle( propertyName ) {
			return element.getComputedStyle.call( element, propertyName );
		}
	}

	function updateSize( that, element, ignoreScroll ) {
		if ( !isHtml( element ) ) // i.e. an element is hidden
			return ( element.size = null ); //	-> reset size to make it useless for other methods

		if ( !element.size )
			element.size = {};

		// Abort if there was a similar query performed recently.
		// This kind of caching provides great performance improvement.
		else if ( element.size.ignoreScroll == ignoreScroll && element.size.date > new Date() - CACHE_TIME ) {
			return null;
		}


		return extend( element.size, getSize( that, element, ignoreScroll ), {
			date: +new Date()
		}, true );
	}

	// Updates that.view.editable object.
	// This one must be called separately outside of updateWindowSize
	// to prevent cyclic dependency getSize<->updateWindowSize.
	// It calls getSize with force flag to avoid getWindowSize cache (look: getSize).
	function updateEditableSize( that, ignoreScroll ) {
		that.view.editable = getSize( that, that.editable, ignoreScroll, true );
	}

	function updateWindowSize( that, force ) {
		if ( !that.view )
			that.view = {};

		var view = that.view;

		if ( !force && view && view.date > new Date() - CACHE_TIME ) {
			return;
		}


		var win = that.win,
			scroll = win.getScrollPosition(),
			paneSize = win.getViewPaneSize();

		extend( that.view, {
			scroll: {
				x: scroll.x,
				y: scroll.y,
				width: that.doc.$.documentElement.scrollWidth - paneSize.width,
				height: that.doc.$.documentElement.scrollHeight - paneSize.height
			},
			pane: {
				width: paneSize.width,
				height: paneSize.height,
				bottom: paneSize.height + scroll.y
			},
			date: +new Date()
		}, true );
	}

	// This method searches document vertically using given
	// select criterion until stop criterion is fulfilled.
	function verticalSearch( that, stopCondition, selectCriterion, startElement ) {
		var upper = startElement,
			lower = startElement,
			mouseStep = 0,
			upperFound = false,
			lowerFound = false,
			viewPaneHeight = that.view.pane.height,
			mouse = that.mouse;

		while ( mouse.y + mouseStep < viewPaneHeight && mouse.y - mouseStep > 0 ) {
			if ( !upperFound )
				upperFound = stopCondition( upper, startElement );

			if ( !lowerFound )
				lowerFound = stopCondition( lower, startElement );

			// Still not found...
			if ( !upperFound && mouse.y - mouseStep > 0 )
				upper = selectCriterion( that, { x: mouse.x, y: mouse.y - mouseStep } );

			if ( !lowerFound && mouse.y + mouseStep < viewPaneHeight )
				lower = selectCriterion( that, { x: mouse.x, y: mouse.y + mouseStep } );

			if ( upperFound && lowerFound )
				break;

			// Instead of ++ to reduce the number of invocations by half.
			// It's trades off accuracy in some edge cases for improved performance.
			mouseStep += 2;
		}

		return new boxTrigger( [ upper, lower, null, null ] );
	}

} )();

/**
 * Sets the default vertical distance between the edge of the element and the mouse pointer that
 * causes the magic line to appear. This option accepts a value in pixels, without the unit (for example:
 * `15` for 15 pixels).
 *
 * Read more in the {@glink features/magicline documentation}
 * and see the {@glink examples/magicline example}.
 *
 *		// Changes the offset to 15px.
 *		CKEDITOR.config.magicline_triggerOffset = 15;
 *
 * @cfg {Number} [magicline_triggerOffset=30]
 * @member CKEDITOR.config
 * @see CKEDITOR.config#magicline_holdDistance
 */

/**
 * Defines the distance between the mouse pointer and the box within
 * which the magic line stays revealed and no other focus space is offered to be accessed.
 * This value is relative to {@link #magicline_triggerOffset}.
 *
 * Read more in the {@glink features/magicline documentation}
 * and see the {@glink examples/magicline example}.
 *
 *		// Increases the distance to 80% of CKEDITOR.config.magicline_triggerOffset.
 *		CKEDITOR.config.magicline_holdDistance = .8;
 *
 * @cfg {Number} [magicline_holdDistance=0.5]
 * @member CKEDITOR.config
 * @see CKEDITOR.config#magicline_triggerOffset
 */

/**
 * Defines the default keystroke that accesses the closest unreachable focus space **before**
 * the caret (start of the selection). If there is no focus space available, the selection remains unchanged.
 *
 * Read more in the {@glink features/magicline documentation}
 * and see the {@glink examples/magicline example}.
 *
 *		// Changes the default keystroke to "Ctrl + ,".
 *		CKEDITOR.config.magicline_keystrokePrevious = CKEDITOR.CTRL + 188;
 *
 * @cfg {Number} [magicline_keystrokePrevious=CKEDITOR.CTRL + CKEDITOR.SHIFT + 51 (CTRL + SHIFT + 3)]
 * @member CKEDITOR.config
 */
CKEDITOR.config.magicline_keystrokePrevious = CKEDITOR.CTRL + CKEDITOR.SHIFT + 51; // CTRL + SHIFT + 3

/**
 * Defines the default keystroke that accesses the closest unreachable focus space **after**
 * the caret (start of the selection). If there is no focus space available, the selection remains unchanged.
 *
 * Read more in the {@glink features/magicline documentation}
 * and see the {@glink examples/magicline example}.
 *
 *		// Changes keystroke to "Ctrl + .".
 *		CKEDITOR.config.magicline_keystrokeNext = CKEDITOR.CTRL + 190;
 *
 * @cfg {Number} [magicline_keystrokeNext=CKEDITOR.CTRL + CKEDITOR.SHIFT + 52 (CTRL + SHIFT + 4)]
 * @member CKEDITOR.config
 */
CKEDITOR.config.magicline_keystrokeNext = CKEDITOR.CTRL + CKEDITOR.SHIFT + 52; // CTRL + SHIFT + 4

/**
 * Defines a list of attributes that, if assigned to some elements, prevent the magic line from being
 * used within these elements.
 *
 * Read more in the {@glink features/magicline documentation}
 * and see the {@glink examples/magicline example}.
 *
 *		// Adds the "data-tabu" attribute to the magic line tabu list.
 *		CKEDITOR.config.magicline_tabuList = [ 'data-tabu' ];
 *
 * @cfg {Number} [magicline_tabuList=[ 'data-widget-wrapper' ]]
 * @member CKEDITOR.config
 */

/**
 * Defines the color of the magic line. The color may be adjusted to enhance readability.
 *
 * Read more in the {@glink features/magicline documentation}
 * and see the {@glink examples/magicline example}.
 *
 *		// Changes magic line color to blue.
 *		CKEDITOR.config.magicline_color = '#0000FF';
 *
 * @cfg {String} [magicline_color='#FF0000']
 * @member CKEDITOR.config
 */

/**
 * Activates the special all-encompassing mode that considers all focus spaces between
 * {@link CKEDITOR.dtd#$block} elements as accessible by the magic line.
 *
 * Read more in the {@glink features/magicline documentation}
 * and see the {@glink examples/magicline example}.
 *
 *		// Enables the greedy "put everywhere" mode.
 *		CKEDITOR.config.magicline_everywhere = true;
 *
 * @cfg {Boolean} [magicline_everywhere=false]
 * @member CKEDITOR.config
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

( function() {
	function protectFormStyles( formElement ) {
		if ( !formElement || formElement.type != CKEDITOR.NODE_ELEMENT || formElement.getName() != 'form' )
			return [];

		var hijackRecord = [],
			hijackNames = [ 'style', 'className' ];
		for ( var i = 0; i < hijackNames.length; i++ ) {
			var name = hijackNames[ i ];
			var $node = formElement.$.elements.namedItem( name );
			if ( $node ) {
				var hijackNode = new CKEDITOR.dom.element( $node );
				hijackRecord.push( [ hijackNode, hijackNode.nextSibling ] );
				hijackNode.remove();
			}
		}

		return hijackRecord;
	}

	function restoreFormStyles( formElement, hijackRecord ) {
		if ( !formElement || formElement.type != CKEDITOR.NODE_ELEMENT || formElement.getName() != 'form' )
			return;

		if ( hijackRecord.length > 0 ) {
			for ( var i = hijackRecord.length - 1; i >= 0; i-- ) {
				var node = hijackRecord[ i ][ 0 ];
				var sibling = hijackRecord[ i ][ 1 ];
				if ( sibling )
					node.insertBefore( sibling );
				else
					node.appendTo( formElement );
			}
		}
	}

	function saveStyles( element, isInsideEditor ) {
		var data = protectFormStyles( element );
		var retval = {};

		var $element = element.$;

		if ( !isInsideEditor ) {
			retval[ 'class' ] = $element.className || '';
			$element.className = '';
		}

		retval.inline = $element.style.cssText || '';
		if ( !isInsideEditor ) // Reset any external styles that might interfere. (https://dev.ckeditor.com/ticket/2474)
		$element.style.cssText = 'position: static; overflow: visible';

		restoreFormStyles( data );
		return retval;
	}

	function restoreStyles( element, savedStyles ) {
		var data = protectFormStyles( element );
		var $element = element.$;
		if ( 'class' in savedStyles )
			$element.className = savedStyles[ 'class' ];
		if ( 'inline' in savedStyles )
			$element.style.cssText = savedStyles.inline;
		restoreFormStyles( data );
	}

	function refreshCursor( editor ) {
		if ( editor.editable().isInline() )
			return;

		// Refresh all editor instances on the page (https://dev.ckeditor.com/ticket/5724).
		var all = CKEDITOR.instances;
		for ( var i in all ) {
			var one = all[ i ];
			if ( one.mode == 'wysiwyg' && !one.readOnly ) {
				var body = one.document.getBody();
				// Refresh 'contentEditable' otherwise
				// DOM lifting breaks design mode. (https://dev.ckeditor.com/ticket/5560)
				body.setAttribute( 'contentEditable', false );
				body.setAttribute( 'contentEditable', true );
			}
		}

		if ( editor.editable().hasFocus ) {
			editor.toolbox.focus();
			editor.focus();
		}
	}

	CKEDITOR.plugins.add( 'maximize', {
		// jscs:disable maximumLineLength
		// jscs:enable maximumLineLength
		init: function( editor ) {
			// Maximize plugin isn't available in inline mode yet.
			if ( editor.elementMode == CKEDITOR.ELEMENT_MODE_INLINE )
				return;

			var lang = editor.lang;
			var mainDocument = CKEDITOR.document,
				mainWindow = mainDocument.getWindow();

			// Saved selection and scroll position for the editing area.
			var savedSelection, savedScroll;

			// Saved scroll position for the outer window.
			var outerScroll;

			// Saved resize handler function.
			function resizeHandler() {
				var viewPaneSize = mainWindow.getViewPaneSize();
				editor.resize( viewPaneSize.width, viewPaneSize.height, null, true );
			}

			// Retain state after mode switches.
			var savedState = CKEDITOR.TRISTATE_OFF;

			editor.addCommand( 'maximize', {
				// Disabled on iOS (https://dev.ckeditor.com/ticket/8307).
				modes: { wysiwyg: !CKEDITOR.env.iOS, source: !CKEDITOR.env.iOS },
				readOnly: 1,
				editorFocus: false,
				exec: function() {
					var container = editor.container.getFirst( function( node ) {
						return node.type == CKEDITOR.NODE_ELEMENT && node.hasClass( 'cke_inner' );
					} );
					var contents = editor.ui.space( 'contents' );

					// Save current selection and scroll position in editing area.
					if ( editor.mode == 'wysiwyg' ) {
						var selection = editor.getSelection();
						savedSelection = selection && selection.getRanges();
						savedScroll = mainWindow.getScrollPosition();
					} else {
						var $textarea = editor.editable().$;
						savedSelection = !CKEDITOR.env.ie && [ $textarea.selectionStart, $textarea.selectionEnd ];
						savedScroll = [ $textarea.scrollLeft, $textarea.scrollTop ];
					}

					// Go fullscreen if the state is off.
					if ( this.state == CKEDITOR.TRISTATE_OFF ) {
						// Add event handler for resizing.
						mainWindow.on( 'resize', resizeHandler );

						// Save the scroll bar position.
						outerScroll = mainWindow.getScrollPosition();

						// Save and reset the styles for the entire node tree.
						var currentNode = editor.container;
						while ( ( currentNode = currentNode.getParent() ) ) {
							currentNode.setCustomData( 'maximize_saved_styles', saveStyles( currentNode ) );
							// Show under floatpanels (-1) and context menu (-2).
							currentNode.setStyle( 'z-index', editor.config.baseFloatZIndex - 5 );
						}
						contents.setCustomData( 'maximize_saved_styles', saveStyles( contents, true ) );
						container.setCustomData( 'maximize_saved_styles', saveStyles( container, true ) );

						// Hide scroll bars.
						var styles = {
							overflow: CKEDITOR.env.webkit ? '' : 'hidden', // https://dev.ckeditor.com/ticket/6896
							width: 0,
							height: 0
						};

						mainDocument.getDocumentElement().setStyles( styles );
						!CKEDITOR.env.gecko && mainDocument.getDocumentElement().setStyle( 'position', 'fixed' );
						!( CKEDITOR.env.gecko && CKEDITOR.env.quirks ) && mainDocument.getBody().setStyles( styles );

						// Scroll to the top left (IE needs some time for it - https://dev.ckeditor.com/ticket/4923).
						CKEDITOR.env.ie ? setTimeout( function() {
							mainWindow.$.scrollTo( 0, 0 );
						}, 0 ) : mainWindow.$.scrollTo( 0, 0 );

						// Resize and move to top left.
						// Special treatment for FF Quirks (https://dev.ckeditor.com/ticket/7284)
						container.setStyle( 'position', CKEDITOR.env.gecko && CKEDITOR.env.quirks ? 'fixed' : 'absolute' );
						container.$.offsetLeft; // SAFARI BUG: See https://dev.ckeditor.com/ticket/2066.
						container.setStyles( {
							// Show under floatpanels (-1) and context menu (-2).
							'z-index': editor.config.baseFloatZIndex - 5,
							left: '0px',
							top: '0px'
						} );

						// Add cke_maximized class before resize handle since that will change things sizes (https://dev.ckeditor.com/ticket/5580)
						container.addClass( 'cke_maximized' );

						resizeHandler();

						// Still not top left? Fix it. (Bug https://dev.ckeditor.com/ticket/174)
						var offset = container.getDocumentPosition();
						container.setStyles( {
							left: ( -1 * offset.x ) + 'px',
							top: ( -1 * offset.y ) + 'px'
						} );

						// Fixing positioning editor chrome in Firefox break design mode. (https://dev.ckeditor.com/ticket/5149)
						CKEDITOR.env.gecko && refreshCursor( editor );
					}
					// Restore from fullscreen if the state is on.
					else if ( this.state == CKEDITOR.TRISTATE_ON ) {
						// Remove event handler for resizing.
						mainWindow.removeListener( 'resize', resizeHandler );

						// Restore CSS styles for the entire node tree.
						var editorElements = [ contents, container ];
						for ( var i = 0; i < editorElements.length; i++ ) {
							restoreStyles( editorElements[ i ], editorElements[ i ].getCustomData( 'maximize_saved_styles' ) );
							editorElements[ i ].removeCustomData( 'maximize_saved_styles' );
						}

						currentNode = editor.container;
						while ( ( currentNode = currentNode.getParent() ) ) {
							restoreStyles( currentNode, currentNode.getCustomData( 'maximize_saved_styles' ) );
							currentNode.removeCustomData( 'maximize_saved_styles' );
						}

						// Restore the window scroll position.
						CKEDITOR.env.ie ? setTimeout( function() {
							mainWindow.$.scrollTo( outerScroll.x, outerScroll.y );
						}, 0 ) : mainWindow.$.scrollTo( outerScroll.x, outerScroll.y );

						// Remove cke_maximized class.
						container.removeClass( 'cke_maximized' );

						// Webkit requires a re-layout on editor chrome. (https://dev.ckeditor.com/ticket/6695)
						if ( CKEDITOR.env.webkit ) {
							container.setStyle( 'display', 'inline' );
							setTimeout( function() {
								container.setStyle( 'display', 'block' );
							}, 0 );
						}

						// Emit a resize event, because this time the size is modified in
						// restoreStyles.
						editor.fire( 'resize', {
							outerHeight: editor.container.$.offsetHeight,
							contentsHeight: contents.$.offsetHeight,
							outerWidth: editor.container.$.offsetWidth
						} );
					}

					this.toggleState();

					// Toggle button label.
					var button = this.uiItems[ 0 ];
					// Only try to change the button if it exists (https://dev.ckeditor.com/ticket/6166)
					if ( button ) {
						var label = ( this.state == CKEDITOR.TRISTATE_OFF ) ? lang.maximize.maximize : lang.maximize.minimize;
						var buttonNode = CKEDITOR.document.getById( button._.id );
						buttonNode.getChild( 1 ).setHtml( label );
						buttonNode.setAttribute( 'title', label );
						buttonNode.setAttribute( 'href', 'javascript:void("' + label + '");' ); // jshint ignore:line
					}

					// Restore selection and scroll position in editing area.
					if ( editor.mode == 'wysiwyg' ) {
						if ( savedSelection ) {
							// Fixing positioning editor chrome in Firefox break design mode. (https://dev.ckeditor.com/ticket/5149)
							CKEDITOR.env.gecko && refreshCursor( editor );

							editor.getSelection().selectRanges( savedSelection );
							var element = editor.getSelection().getStartElement();
							element && element.scrollIntoView( true );
						} else {
							mainWindow.$.scrollTo( savedScroll.x, savedScroll.y );
						}
					} else {
						if ( savedSelection ) {
							$textarea.selectionStart = savedSelection[ 0 ];
							$textarea.selectionEnd = savedSelection[ 1 ];
						}
						$textarea.scrollLeft = savedScroll[ 0 ];
						$textarea.scrollTop = savedScroll[ 1 ];
					}

					savedSelection = savedScroll = null;
					savedState = this.state;

					editor.fire( 'maximize', this.state );
				},
				canUndo: false
			} );

			editor.ui.addButton && editor.ui.addButton( 'Maximize', {
				label: lang.maximize.maximize,
				command: 'maximize',
				toolbar: 'tools,10'
			} );

			// Restore the command state after mode change, unless it has been changed to disabled (https://dev.ckeditor.com/ticket/6467)
			editor.on( 'mode', function() {
				var command = editor.getCommand( 'maximize' );
				command.setState( command.state == CKEDITOR.TRISTATE_DISABLED ? CKEDITOR.TRISTATE_DISABLED : savedState );
			}, null, null, 100 );
		}
	} );
} )();

/**
 * Event fired when the maximize command is called.
 * It also indicates whether an editor is maximized or not.
 *
 * @event maximize
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param {Number} data Current state of the command. See {@link CKEDITOR#TRISTATE_ON} and {@link CKEDITOR#TRISTATE_OFF}.
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

( function() {
	/* global confirm */

	CKEDITOR.plugins.add( 'pastefromword', {
		requires: 'clipboard',
		// jscs:disable maximumLineLength
		// jscs:enable maximumLineLength
		init: function( editor ) {
			// Flag indicate this command is actually been asked instead of a generic pasting.
			var forceFromWord = 0,
				path = this.path,
				configInlineImages = editor.config.pasteFromWord_inlineImages === undefined ? true : editor.config.pasteFromWord_inlineImages;

			editor.addCommand( 'pastefromword', {
				// Snapshots are done manually by editable.insertXXX methods.
				canUndo: false,
				async: true,

				/**
				 * The Paste from Word command. It will determine its pasted content from Word automatically if possible.
				 *
				 * At the time of writing it was working correctly only in Internet Explorer browsers, due to their
				 * `paste` support in `document.execCommand`.
				 *
				 * @private
				 * @param {CKEDITOR.editor} editor An instance of the editor where the command is being executed.
				 * @param {Object} [data] The options object.
				 * @param {Boolean/String} [data.notification=true] Content for a notification shown after an unsuccessful
				 * paste attempt. If `false`, the notification will not be displayed. This parameter was added in 4.7.0.
				 * @member CKEDITOR.editor.commands.pastefromword
				 */
				exec: function( editor, data ) {
					forceFromWord = 1;
					editor.execCommand( 'paste', {
						type: 'html',
						notification: data && typeof data.notification !== 'undefined' ? data.notification : true
					} );
				}
			} );

			// Register the toolbar button.
			CKEDITOR.plugins.clipboard.addPasteButton( editor, 'PasteFromWord', {
				label: editor.lang.pastefromword.toolbar,
				command: 'pastefromword',
				toolbar: 'clipboard,50'
			} );

			// Features brought by this command beside the normal process:
			// 1. No more bothering of user about the clean-up.
			// 2. Perform the clean-up even if content is not from Microsoft Word.
			// (e.g. from a Microsoft Word similar application.)
			// 3. Listen with high priority (3), so clean up is done before content
			// type sniffing (priority = 6).
			editor.on( 'paste', function( evt ) {
				var data = evt.data,
					dataTransferHtml = CKEDITOR.plugins.clipboard.isCustomDataTypesSupported ?
						data.dataTransfer.getData( 'text/html', true ) : null,
					// Required in Paste from Word Image plugin (#662).
					dataTransferRtf = CKEDITOR.plugins.clipboard.isCustomDataTypesSupported ?
						data.dataTransfer.getData( 'text/rtf' ) : null,
					// Some commands fire paste event without setting dataTransfer property. In such case
					// dataValue should be used.
					mswordHtml = dataTransferHtml || data.dataValue,
					pfwEvtData = { dataValue: mswordHtml, dataTransfer: { 'text/rtf': dataTransferRtf } },
					officeMetaRegexp = /<meta\s*name=(?:\"|\')?generator(?:\"|\')?\s*content=(?:\"|\')?microsoft/gi,
					wordRegexp = /(class=\"?Mso|style=(?:\"|\')[^\"]*?\bmso\-|w:WordDocument|<o:\w+>|<\/font>)/,
					isOfficeContent = officeMetaRegexp.test( mswordHtml ) || wordRegexp.test( mswordHtml );

				if ( !mswordHtml || !( forceFromWord || isOfficeContent ) ) {
					return;
				}

				// PFW might still get prevented, if it's not forced.
				if ( editor.fire( 'pasteFromWord', pfwEvtData ) === false && !forceFromWord ) {
					return;
				}

				// Do not apply paste filter to data filtered by the Word filter (https://dev.ckeditor.com/ticket/13093).
				data.dontFilter = true;

				// If filter rules aren't loaded then cancel 'paste' event,
				// load them and when they'll get loaded fire new paste event
				// for which data will be filtered in second execution of
				// this listener.
				var isLazyLoad = loadFilterRules( editor, path, function() {
					// Event continuation with the original data.
					if ( isLazyLoad ) {
						editor.fire( 'paste', data );
					} else if ( !editor.config.pasteFromWordPromptCleanup || ( forceFromWord || confirm( editor.lang.pastefromword.confirmCleanup ) ) ) {

						pfwEvtData.dataValue = CKEDITOR.cleanWord( pfwEvtData.dataValue, editor );

						editor.fire( 'afterPasteFromWord', pfwEvtData );

						data.dataValue = pfwEvtData.dataValue;

						if ( editor.config.forcePasteAsPlainText === true ) {
							// If `config.forcePasteAsPlainText` set to true, force plain text even on Word content (#1013).
							data.type = 'text';
						} else if ( !CKEDITOR.plugins.clipboard.isCustomCopyCutSupported && editor.config.forcePasteAsPlainText === 'allow-word' ) {
							// In browsers using pastebin when pasting from Word, evt.data.type is 'auto' (not 'html') so it gets converted
							// by 'pastetext' plugin to 'text'. We need to restore 'html' type (#1013) and (#1638).
							data.type = 'html';
						}
					}

					// Reset forceFromWord.
					forceFromWord = 0;
				} );

				// The cleanup rules are to be loaded, we should just cancel
				// this event.
				isLazyLoad && evt.cancel();
			}, null, null, 3 );

			// Paste From Word Image:
			// RTF clipboard is required for embedding images.
			// If img tags are not allowed there is no point to process images.
			if ( CKEDITOR.plugins.clipboard.isCustomDataTypesSupported && configInlineImages ) {
				editor.on( 'afterPasteFromWord', imagePastingListener );
			}

			function imagePastingListener( evt ) {
				var pfw = CKEDITOR.plugins.pastefromword && CKEDITOR.plugins.pastefromword.images,
					imgTags,
					hexImages,
					newSrcValues = [],
					i;

				// If pfw images namespace is unavailable or img tags are not allowed we simply skip adding images.
				if ( !pfw || !evt.editor.filter.check( 'img[src]' ) ) {
					return;
				}

				function createSrcWithBase64( img ) {
					return img.type ? 'data:' + img.type + ';base64,' + CKEDITOR.tools.convertBytesToBase64( CKEDITOR.tools.convertHexStringToBytes( img.hex ) ) : null;
				}

				imgTags = pfw.extractTagsFromHtml( evt.data.dataValue );
				if ( imgTags.length === 0 ) {
					return;
				}

				hexImages = pfw.extractFromRtf( evt.data.dataTransfer[ 'text/rtf' ] );
				if ( hexImages.length === 0 ) {
					return;
				}

				CKEDITOR.tools.array.forEach( hexImages, function( img ) {
					newSrcValues.push( createSrcWithBase64( img ) );
				}, this );

				// Assuming there is equal amount of Images in RTF and HTML source, so we can match them accordingly to the existing order.
				if ( imgTags.length === newSrcValues.length ) {
					for ( i = 0; i < imgTags.length; i++ ) {
						// Replace only `file` urls of images ( shapes get newSrcValue with null ).
						if ( ( imgTags[ i ].indexOf( 'file://' ) === 0 ) && newSrcValues[ i ] ) {
							evt.data.dataValue = evt.data.dataValue.replace( imgTags[ i ], newSrcValues[ i ] );
						}
					}
				}
			}
		}

	} );

	function loadFilterRules( editor, path, callback ) {
		var isLoaded = CKEDITOR.cleanWord;

		if ( isLoaded )
			callback();
		else {
			var filterFilePath = CKEDITOR.getUrl( editor.config.pasteFromWordCleanupFile || ( path + 'filter/default.js' ) );

			// Load with busy indicator.
			CKEDITOR.scriptLoader.load( filterFilePath, callback, null, true );
		}

		return !isLoaded;
	}
} )();


/**
 * Whether to prompt the user about the clean up of content being pasted from Microsoft Word.
 *
 *		config.pasteFromWordPromptCleanup = true;
 *
 * @since 3.1.0
 * @cfg {Boolean} [pasteFromWordPromptCleanup=false]
 * @member CKEDITOR.config
 */

/**
 * The file that provides the Microsoft Word cleanup function for pasting operations.
 *
 * **Note:** This is a global configuration shared by all editor instances present
 * on the page.
 *
 *		// Load from the 'pastefromword' plugin 'filter' sub folder (custom.js file) using a path relative to the CKEditor installation folder.
 *		CKEDITOR.config.pasteFromWordCleanupFile = 'plugins/pastefromword/filter/custom.js';
 *
 *		// Load from the 'pastefromword' plugin 'filter' sub folder (custom.js file) using a full path (including the CKEditor installation folder).
 *		CKEDITOR.config.pasteFromWordCleanupFile = '/ckeditor/plugins/pastefromword/filter/custom.js';
 *
 *		// Load custom.js file from the 'customFilters' folder (located in server's root) using the full URL.
 *		CKEDITOR.config.pasteFromWordCleanupFile = 'http://my.example.com/customFilters/custom.js';
 *
 * @since 3.1.0
 * @cfg {String} [pasteFromWordCleanupFile=<plugin path> + 'filter/default.js']
 * @member CKEDITOR.config
 */

/**
 * Flag decides whether embedding images pasted with Word content is enabled or not.
 *
 * **Note:** Please be aware that embedding images requires Clipboard API support, available only in modern browsers, that is indicated by
 * {@link CKEDITOR.plugins.clipboard#isCustomDataTypesSupported} flag.
 *
 *		// Disable embedding images pasted from Word.
 *		config.pasteFromWord_inlineImages = false;
 *
 * @since 4.8.0
 * @cfg {Boolean} [pasteFromWord_inlineImages=true]
 * @member CKEDITOR.config
 */

/**
 * Whether pasted element `margin` style that equals to 0 should be removed.
 *
 *		// Disable removing `margin:0`, `margin-left:0`, etc.
 *		config.pasteFromWord_keepZeroMargins = true;
 *
 * @since 4.12.0
 * @cfg {Boolean} [pasteFromWord_keepZeroMargins=false]
 * @member CKEDITOR.config
 */

/**
 * Fired when the pasted content was recognized as Microsoft Word content.
 *
 * This event is cancellable. If canceled, it will prevent Paste from Word processing.
 *
 * @since 4.6.0
 * @event pasteFromWord
 * @param data
 * @param {String} data.dataValue Pasted content. Changes to this property will affect the pasted content.
 * @member CKEDITOR.editor
 */

/**
 * Fired after the Paste form Word filters have been applied.
 *
 * @since 4.6.0
 * @event afterPasteFromWord
 * @param data
 * @param {String} data.dataValue Pasted content after processing. Changes to this property will affect the pasted content.
 * @member CKEDITOR.editor
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview The Paste as plain text plugin.
 */

( function() {
	// The pastetext command definition.
	var pasteTextCmd = {
		// Snapshots are done manually by editable.insertXXX methods.
		canUndo: false,
		async: true,

		/**
		 * The Paste as plain text command. It will determine its pasted text automatically if possible.
		 *
		 * At the time of writing it was working correctly only in Internet Explorer browsers, due to their
		 * `paste` support in `document.execCommand`.
		 *
		 * @private
		 * @param {CKEDITOR.editor} editor An instance of the editor where the command is being executed.
		 * @param {Object} [data] The options object.
		 * @param {Boolean/String} [data.notification=true] Content for a notification shown after an unsuccessful
		 * paste attempt. If `false`, the notification will not be displayed. This parameter was added in 4.7.0.
		 * @member CKEDITOR.editor.commands.pastetext
		 */
		exec: function( editor, data ) {
			var lang = editor.lang,
				// In IE we must display keystroke for `paste` command as blocked `pastetext`
				// can fallback only to native paste.
				keyInfo = CKEDITOR.tools.keystrokeToString( lang.common.keyboard,
					editor.getCommandKeystroke( CKEDITOR.env.ie ? editor.commands.paste : this ) ),
				notification = ( data && typeof data.notification !== 'undefined' ) ? data.notification :
					!data || !data.from || ( data.from === 'keystrokeHandler' && CKEDITOR.env.ie ),
				msg = ( notification && typeof notification === 'string' ) ? notification : lang.pastetext.pasteNotification
					.replace( /%1/, '<kbd aria-label="' + keyInfo.aria + '">' + keyInfo.display + '</kbd>' );

			editor.execCommand( 'paste', {
				type: 'text',
				notification: notification ? msg : false
			} );
		}
	};

	// Register the plugin.
	CKEDITOR.plugins.add( 'pastetext', {
		requires: 'clipboard',
		// jscs:disable maximumLineLength
		// jscs:enable maximumLineLength
		init: function( editor ) {
			var commandName = 'pastetext',
				pasteKeystroke = !CKEDITOR.env.safari ? CKEDITOR.CTRL + CKEDITOR.SHIFT + 86 : // Ctrl + Shift + V
					CKEDITOR.CTRL + CKEDITOR.ALT + CKEDITOR.SHIFT + 86; // Ctrl + Shift + Alt + V

			editor.addCommand( commandName, pasteTextCmd );

			editor.setKeystroke( pasteKeystroke, commandName );

			CKEDITOR.plugins.clipboard.addPasteButton( editor, 'PasteText', {
				label: editor.lang.pastetext.button,
				command: commandName,
				toolbar: 'clipboard,40'
			} );

			if ( editor.config.forcePasteAsPlainText ) {
				editor.on( 'beforePaste', function( evt ) {
					// Do NOT overwrite if HTML format is explicitly requested.
					// This allows pastefromword dominates over pastetext.
					if ( evt.data.type != 'html' ) {
						evt.data.type = 'text';
					}
				} );
			}

			editor.on( 'pasteState', function( evt ) {
				editor.getCommand( commandName ).setState( evt.data );
			} );
		}
	} );
} )();


/**
 * Whether to force all pasting operations to insert plain text into the
 * editor, losing any formatting information possibly available in the source text.
 *
 * This option accepts the following settings:
 *
 * *  `true` &ndash; Pastes all content as plain text.
 * *  `false` &ndash; Preserves content formatting.
 * *  `allow-word` &ndash; Content pasted from Microsoft Word will keep its formatting
 *     while any other content will be pasted as plain text.
 *
 * Example:
 *
 *		// All content will be pasted as plain text.
 *		config.forcePasteAsPlainText = true;
 *
 *		// Only Microsoft Word content formatting will be preserved.
 * 		config.forcePasteAsPlainText = 'allow-word';
 *
 * @cfg {Boolean/String} [forcePasteAsPlainText=false]
 * @member CKEDITOR.config
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Print Plugin
 */

CKEDITOR.plugins.add( 'print', {
	// jscs:disable maximumLineLength
	// jscs:enable maximumLineLength
	init: function( editor ) {
		// Print plugin isn't available in inline mode yet.
		if ( editor.elementMode == CKEDITOR.ELEMENT_MODE_INLINE )
			return;

		var pluginName = 'print';

		// Register the command.
		editor.addCommand( pluginName, CKEDITOR.plugins.print );

		// Register the toolbar button.
		editor.ui.addButton && editor.ui.addButton( 'Print', {
			label: editor.lang.print.toolbar,
			command: pluginName,
			toolbar: 'document,50'
		} );
	}
} );

CKEDITOR.plugins.print = {
	exec: function( editor ) {
		if ( CKEDITOR.env.gecko ) {
			editor.window.$.print();
		} else {
			editor.document.$.execCommand( 'Print' );
		}
	},
	canUndo: false,
	readOnly: 1,
	modes: { wysiwyg: 1 }
};

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

CKEDITOR.plugins.add( 'removeformat', {
	// jscs:disable maximumLineLength
	// jscs:enable maximumLineLength
	init: function( editor ) {
		editor.addCommand( 'removeFormat', CKEDITOR.plugins.removeformat.commands.removeformat );
		editor.ui.addButton && editor.ui.addButton( 'RemoveFormat', {
			label: editor.lang.removeformat.toolbar,
			command: 'removeFormat',
			toolbar: 'cleanup,10'
		} );
	}
} );

CKEDITOR.plugins.removeformat = {
	commands: {
		removeformat: {
			exec: function( editor ) {
				var tagsRegex = editor._.removeFormatRegex || ( editor._.removeFormatRegex = new RegExp( '^(?:' + editor.config.removeFormatTags.replace( /,/g, '|' ) + ')$', 'i' ) );

				var removeAttributes = editor._.removeAttributes || ( editor._.removeAttributes = editor.config.removeFormatAttributes.split( ',' ) ),
					filter = CKEDITOR.plugins.removeformat.filter,
					ranges = editor.getSelection().getRanges(),
					iterator = ranges.createIterator(),
					isElement = function( element ) {
						return element.type == CKEDITOR.NODE_ELEMENT;
					},
					newRanges = [],
					range;

				while ( ( range = iterator.getNextRange() ) ) {
					var bookmarkForRangeRecreation = range.createBookmark();
					range = editor.createRange();
					range.setStartBefore( bookmarkForRangeRecreation.startNode );
					bookmarkForRangeRecreation.endNode && range.setEndAfter( bookmarkForRangeRecreation.endNode );

					if ( !range.collapsed )
						range.enlarge( CKEDITOR.ENLARGE_ELEMENT );

					// Bookmark the range so we can re-select it after processing.
					var bookmark = range.createBookmark(),
						// The style will be applied within the bookmark boundaries.
						startNode = bookmark.startNode,
						endNode = bookmark.endNode,
						currentNode;

					// We need to check the selection boundaries (bookmark spans) to break
					// the code in a way that we can properly remove partially selected nodes.
					// For example, removing a <b> style from
					//		<b>This is [some text</b> to show <b>the] problem</b>
					// ... where [ and ] represent the selection, must result:
					//		<b>This is </b>[some text to show the]<b> problem</b>
					// The strategy is simple, we just break the partial nodes before the
					// removal logic, having something that could be represented this way:
					//		<b>This is </b>[<b>some text</b> to show <b>the</b>]<b> problem</b>

					var breakParent = function( node ) {
							// Let's start checking the start boundary.
							var path = editor.elementPath( node ),
								pathElements = path.elements;

							for ( var i = 1, pathElement; pathElement = pathElements[ i ]; i++ ) {
								if ( pathElement.equals( path.block ) || pathElement.equals( path.blockLimit ) )
									break;

								// If this element can be removed (even partially).
								if ( tagsRegex.test( pathElement.getName() ) && filter( editor, pathElement ) )
									node.breakParent( pathElement );
							}
						};

					breakParent( startNode );
					if ( endNode ) {
						breakParent( endNode );

						// Navigate through all nodes between the bookmarks.
						currentNode = startNode.getNextSourceNode( true, CKEDITOR.NODE_ELEMENT );

						while ( currentNode ) {
							// If we have reached the end of the selection, stop looping.
							if ( currentNode.equals( endNode ) )
								break;

							if ( currentNode.isReadOnly() ) {
								// In case of non-editable we're skipping to the next sibling *elmenet*.

								// We need to be aware that endNode can be nested within current non-editable.
								// This condition tests if currentNode (non-editable) contains endNode. If it does
								// then we should break the filtering
								if ( currentNode.getPosition( endNode ) & CKEDITOR.POSITION_CONTAINS ) {
									break;
								}

								currentNode = currentNode.getNext( isElement );
								continue;
							}

							// Cache the next node to be processed. Do it now, because
							// currentNode may be removed.
							var nextNode = currentNode.getNextSourceNode( false, CKEDITOR.NODE_ELEMENT ),
								isFakeElement =
									( currentNode.getName() == 'img' && currentNode.data( 'cke-realelement' ) ) ||
									currentNode.hasAttribute( 'data-cke-bookmark' );

							// This node must not be a fake element, and must not be read-only.
							if ( !isFakeElement && filter( editor, currentNode ) ) {
								// Remove elements nodes that match with this style rules.
								if ( tagsRegex.test( currentNode.getName() ) )
									currentNode.remove( 1 );
								else {
									currentNode.removeAttributes( removeAttributes );
									editor.fire( 'removeFormatCleanup', currentNode );
								}
							}

							currentNode = nextNode;
						}
					}

					bookmark.startNode.remove();
					bookmark.endNode && bookmark.endNode.remove();
					range.moveToBookmark( bookmarkForRangeRecreation );
					newRanges.push( range );
				}

				// The selection path may not changed, but we should force a selection
				// change event to refresh command states, due to the above attribution change. (https://dev.ckeditor.com/ticket/9238)
				editor.forceNextSelectionCheck();
				editor.getSelection().selectRanges( newRanges );
			}
		}
	},

	// Perform the remove format filters on the passed element.
	// @param {CKEDITOR.editor} editor
	// @param {CKEDITOR.dom.element} element
	filter: function( editor, element ) {
		// If editor#addRemoveFotmatFilter hasn't been executed yet value is not initialized.
		var filters = editor._.removeFormatFilters || [];
		for ( var i = 0; i < filters.length; i++ ) {
			if ( filters[ i ]( element ) === false )
				return false;
		}
		return true;
	}
};

/**
 * Add to a collection of functions to decide whether a specific
 * element should be considered as formatting element and thus
 * could be removed during `removeFormat` command.
 *
 * **Note:** Only available with the existence of `removeformat` plugin.
 *
 *		// Don't remove empty span.
 *		editor.addRemoveFormatFilter( function( element ) {
 *			return !( element.is( 'span' ) && CKEDITOR.tools.isEmpty( element.getAttributes() ) );
 *		} );
 *
 * @since 3.3.0
 * @member CKEDITOR.editor
 * @param {Function} func The function to be called, which will be passed an {@link CKEDITOR.dom.element element} to test.
 */
CKEDITOR.editor.prototype.addRemoveFormatFilter = function( func ) {
	if ( !this._.removeFormatFilters )
		this._.removeFormatFilters = [];

	this._.removeFormatFilters.push( func );
};

/**
 * A comma separated list of elements to be removed when executing the `remove
 * format` command. Note that only inline elements are allowed.
 *
 * @cfg
 * @member CKEDITOR.config
 */
CKEDITOR.config.removeFormatTags = 'b,big,cite,code,del,dfn,em,font,i,ins,kbd,q,s,samp,small,span,strike,strong,sub,sup,tt,u,var';

/**
 * A comma separated list of elements attributes to be removed when executing
 * the `remove format` command.
 *
 * @cfg
 * @member CKEDITOR.config
 */
CKEDITOR.config.removeFormatAttributes = 'class,style,lang,width,height,align,hspace,valign';

/**
 * Fired after an element was cleaned by the removeFormat plugin.
 *
 * @event removeFormatCleanup
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param data
 * @param {CKEDITOR.dom.element} data.element The element that was cleaned up.
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

CKEDITOR.plugins.add( 'resize', {
	init: function( editor ) {
		function dragHandler( evt ) {
			var dx = evt.data.$.screenX - origin.x,
			dy = evt.data.$.screenY - origin.y,
			width = startSize.width,
			height = startSize.height,
			internalWidth = width + dx * ( resizeDir == 'rtl' ? -1 : 1 ),
			internalHeight = height + dy;

			if ( resizeHorizontal )
				width = Math.max( config.resize_minWidth, Math.min( internalWidth, config.resize_maxWidth ) );

			if ( resizeVertical )
				height = Math.max( config.resize_minHeight, Math.min( internalHeight, config.resize_maxHeight ) );

			// DO NOT impose fixed size with single direction resize. (https://dev.ckeditor.com/ticket/6308)
			editor.resize( resizeHorizontal ? width : null, height );
		}

		function dragEndHandler() {
			CKEDITOR.document.removeListener( 'mousemove', dragHandler );
			CKEDITOR.document.removeListener( 'mouseup', dragEndHandler );

			if ( editor.document ) {
				editor.document.removeListener( 'mousemove', dragHandler );
				editor.document.removeListener( 'mouseup', dragEndHandler );
			}
		}

		var config = editor.config;
		var spaceId = editor.ui.spaceId( 'resizer' );

		// Resize in the same direction of chrome,
		// which is identical to dir of editor element. (https://dev.ckeditor.com/ticket/6614)
		var resizeDir = editor.element ? editor.element.getDirection( 1 ) : 'ltr';

		!config.resize_dir && ( config.resize_dir = 'vertical' );
		( config.resize_maxWidth === undefined ) && ( config.resize_maxWidth = 3000 );
		( config.resize_maxHeight === undefined ) && ( config.resize_maxHeight = 3000 );
		( config.resize_minWidth === undefined ) && ( config.resize_minWidth = 750 );
		( config.resize_minHeight === undefined ) && ( config.resize_minHeight = 250 );

		if ( config.resize_enabled !== false ) {
			var container = null,
				origin, startSize,
				resizeHorizontal = ( config.resize_dir == 'both' || config.resize_dir == 'horizontal' ) && ( config.resize_minWidth != config.resize_maxWidth ),
				resizeVertical = ( config.resize_dir == 'both' || config.resize_dir == 'vertical' ) && ( config.resize_minHeight != config.resize_maxHeight );

			var mouseDownFn = CKEDITOR.tools.addFunction( function( $event ) {
				if ( !container )
					container = editor.getResizable();

				startSize = { width: container.$.offsetWidth || 0, height: container.$.offsetHeight || 0 };
				origin = { x: $event.screenX, y: $event.screenY };

				config.resize_minWidth > startSize.width && ( config.resize_minWidth = startSize.width );
				config.resize_minHeight > startSize.height && ( config.resize_minHeight = startSize.height );

				CKEDITOR.document.on( 'mousemove', dragHandler );
				CKEDITOR.document.on( 'mouseup', dragEndHandler );

				if ( editor.document ) {
					editor.document.on( 'mousemove', dragHandler );
					editor.document.on( 'mouseup', dragEndHandler );
				}

				$event.preventDefault && $event.preventDefault();
			} );

			editor.on( 'destroy', function() {
				CKEDITOR.tools.removeFunction( mouseDownFn );
			} );

			editor.on( 'uiSpace', function( event ) {
				if ( event.data.space == 'bottom' ) {
					var direction = '';
					if ( resizeHorizontal && !resizeVertical )
						direction = ' cke_resizer_horizontal';
					if ( !resizeHorizontal && resizeVertical )
						direction = ' cke_resizer_vertical';

					var resizerHtml =
						'<span' +
						' id="' + spaceId + '"' +
						' class="cke_resizer' + direction + ' cke_resizer_' + resizeDir + '"' +
						' title="' + CKEDITOR.tools.htmlEncode( editor.lang.common.resize ) + '"' +
						' onmousedown="CKEDITOR.tools.callFunction(' + mouseDownFn + ', event)"' +
						'>' +
						// BLACK LOWER RIGHT TRIANGLE (ltr)
						// BLACK LOWER LEFT TRIANGLE (rtl)
						( resizeDir == 'ltr' ? '\u25E2' : '\u25E3' ) +
						'</span>';

					// Always sticks the corner of botttom space.
					resizeDir == 'ltr' && direction == 'ltr' ? event.data.html += resizerHtml : event.data.html = resizerHtml + event.data.html;
				}
			}, editor, null, 100 );

			// Toggle the visibility of the resizer when an editor is being maximized or minimized.
			editor.on( 'maximize', function( event ) {
				editor.ui.space( 'resizer' )[ event.data == CKEDITOR.TRISTATE_ON ? 'hide' : 'show' ]();
			} );
		}
	}
} );

/**
 * The minimum editor width, in pixels, when resizing the editor interface by using the resize handle.
 * Note: It falls back to editor's actual width if it is smaller than the default value.
 *
 * Read more in the {@glink features/resize documentation}
 * and see the {@glink examples/resize example}.
 *
 *		config.resize_minWidth = 500;
 *
 * @cfg {Number} [resize_minWidth=750]
 * @member CKEDITOR.config
 */

/**
 * The minimum editor height, in pixels, when resizing the editor interface by using the resize handle.
 * Note: It falls back to editor's actual height if it is smaller than the default value.
 *
 * Read more in the {@glink features/resize documentation}
 * and see the {@glink examples/resize example}.
 *
 *		config.resize_minHeight = 600;
 *
 * @cfg {Number} [resize_minHeight=250]
 * @member CKEDITOR.config
 */

/**
 * The maximum editor width, in pixels, when resizing the editor interface by using the resize handle.
 *
 * Read more in the {@glink features/resize documentation}
 * and see the {@glink examples/resize example}.
 *
 *		config.resize_maxWidth = 750;
 *
 * @cfg {Number} [resize_maxWidth=3000]
 * @member CKEDITOR.config
 */

/**
 * The maximum editor height, in pixels, when resizing the editor interface by using the resize handle.
 *
 * Read more in the {@glink features/resize documentation}
 * and see the {@glink examples/resize example}.
 *
 *		config.resize_maxHeight = 600;
 *
 * @cfg {Number} [resize_maxHeight=3000]
 * @member CKEDITOR.config
 */

/**
 * Whether to enable the resizing feature. If this feature is disabled, the resize handle will not be visible.
 *
 * Read more in the {@glink features/resize documentation}
 * and see the {@glink examples/resize example}.
 *
 *		config.resize_enabled = false;
 *
 * @cfg {Boolean} [resize_enabled=true]
 * @member CKEDITOR.config
 */

/**
 * The dimensions for which the editor resizing is enabled. Possible values
 * are `both`, `vertical`, and `horizontal`.
 *
 * Read more in the {@glink features/resize documentation}
 * and see the {@glink examples/resize example}.
 *
 *		config.resize_dir = 'both';
 *
 * @since 3.3.0
 * @cfg {String} [resize_dir='vertical']
 * @member CKEDITOR.config
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview The Source Editing Area plugin. It registers the "source" editing
 *		mode, which displays raw  HTML data being edited in the editor.
 */

( function() {
	CKEDITOR.plugins.add( 'sourcearea', {
		// jscs:disable maximumLineLength
		// jscs:enable maximumLineLength
		init: function( editor ) {
			// Source mode in inline editors is only available through the "sourcedialog" plugin.
			if ( editor.elementMode == CKEDITOR.ELEMENT_MODE_INLINE )
				return;

			var sourcearea = CKEDITOR.plugins.sourcearea;

			editor.addMode( 'source', function( callback ) {
				var contentsSpace = editor.ui.space( 'contents' ),
					textarea = contentsSpace.getDocument().createElement( 'textarea' );

				textarea.setStyles(
					CKEDITOR.tools.extend( {
						// IE7 has overflow the <textarea> from wrapping table cell.
						width: CKEDITOR.env.ie7Compat ? '99%' : '100%',
						height: '100%',
						resize: 'none',
						outline: 'none',
						'text-align': 'left'
					},
					CKEDITOR.tools.cssVendorPrefix( 'tab-size', editor.config.sourceAreaTabSize || 4 ) ) );

				// Make sure that source code is always displayed LTR,
				// regardless of editor language (https://dev.ckeditor.com/ticket/10105).
				textarea.setAttribute( 'dir', 'ltr' );

				textarea.addClass( 'cke_source' ).addClass( 'cke_reset' ).addClass( 'cke_enable_context_menu' );

				editor.ui.space( 'contents' ).append( textarea );

				var editable = editor.editable( new sourceEditable( editor, textarea ) );

				// Fill the textarea with the current editor data.
				editable.setData( editor.getData( 1 ) );

				// Having to make <textarea> fixed sized to conquer the following bugs:
				// 1. The textarea height/width='100%' doesn't constraint to the 'td' in IE6/7.
				// 2. Unexpected vertical-scrolling behavior happens whenever focus is moving out of editor
				// if text content within it has overflowed. (https://dev.ckeditor.com/ticket/4762)
				if ( CKEDITOR.env.ie ) {
					editable.attachListener( editor, 'resize', onResize, editable );
					editable.attachListener( CKEDITOR.document.getWindow(), 'resize', onResize, editable );
					CKEDITOR.tools.setTimeout( onResize, 0, editable );
				}

				editor.fire( 'ariaWidget', this );

				callback();
			} );

			editor.addCommand( 'source', sourcearea.commands.source );

			if ( editor.ui.addButton ) {
				editor.ui.addButton( 'Source', {
					label: editor.lang.sourcearea.toolbar,
					command: 'source',
					toolbar: 'mode,10'
				} );
			}

			editor.on( 'mode', function() {
				editor.getCommand( 'source' ).setState( editor.mode == 'source' ? CKEDITOR.TRISTATE_ON : CKEDITOR.TRISTATE_OFF );
			} );

			var needsFocusHack = CKEDITOR.env.ie && CKEDITOR.env.version == 9;

			function onResize() {
				// We have to do something with focus on IE9, because if sourcearea had focus
				// before being resized, the caret ends somewhere in the editor UI (https://dev.ckeditor.com/ticket/11839).
				var wasActive = needsFocusHack && this.equals( CKEDITOR.document.getActive() );

				// Holder rectange size is stretched by textarea,
				// so hide it just for a moment.
				this.hide();
				this.setStyle( 'height', this.getParent().$.clientHeight + 'px' );
				this.setStyle( 'width', this.getParent().$.clientWidth + 'px' );
				// When we have proper holder size, show textarea again.
				this.show();

				if ( wasActive )
					this.focus();
			}
		}
	} );

	var sourceEditable = CKEDITOR.tools.createClass( {
		base: CKEDITOR.editable,
		proto: {
			setData: function( data ) {
				this.setValue( data );
				this.status = 'ready';
				this.editor.fire( 'dataReady' );
			},

			getData: function() {
				return this.getValue();
			},

			// Insertions are not supported in source editable.
			insertHtml: function() {},
			insertElement: function() {},
			insertText: function() {},

			// Read-only support for textarea.
			setReadOnly: function( isReadOnly ) {
				this[ ( isReadOnly ? 'set' : 'remove' ) + 'Attribute' ]( 'readOnly', 'readonly' );
			},

			detach: function() {
				sourceEditable.baseProto.detach.call( this );
				this.clearCustomData();
				this.remove();
			}
		}
	} );
} )();

CKEDITOR.plugins.sourcearea = {
	commands: {
		source: {
			modes: { wysiwyg: 1, source: 1 },
			editorFocus: false,
			readOnly: 1,
			exec: function( editor ) {
				if ( editor.mode == 'wysiwyg' )
					editor.fire( 'saveSnapshot' );
				editor.getCommand( 'source' ).setState( CKEDITOR.TRISTATE_DISABLED );
				editor.setMode( editor.mode == 'source' ? 'wysiwyg' : 'source' );
			},

			canUndo: false
		}
	}
};

/**
 * Controls the `tab-size` CSS property of the source editing area. Use it to set the width
 * of the tab character in the source view. Enter an integer to denote the number of spaces
 * that the tab will contain.
 *
 * **Note:** Works only with {@link #dataIndentationChars}
 * set to `'\t'`. Please consider that not all browsers support the `tab-size` CSS
 * property yet.
 *
 *		// Set tab-size to 10 characters.
 *		config.sourceAreaTabSize = 10;
 *
 * @cfg {Number} [sourceAreaTabSize=4]
 * @member CKEDITOR.config
 * @see CKEDITOR.config#dataIndentationChars
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Special Character plugin
 */

CKEDITOR.plugins.add( 'specialchar', {
	// List of available localizations.
	// jscs:disable
	availableLangs: { af:1,ar:1,az:1,bg:1,ca:1,cs:1,cy:1,da:1,de:1,'de-ch':1,el:1,en:1,'en-au':1,'en-ca':1,'en-gb':1,eo:1,es:1,'es-mx':1,et:1,eu:1,fa:1,fi:1,fr:1,'fr-ca':1,gl:1,he:1,hr:1,hu:1,id:1,it:1,ja:1,km:1,ko:1,ku:1,lt:1,lv:1,nb:1,nl:1,no:1,oc:1,pl:1,pt:1,'pt-br':1,ro:1,ru:1,si:1,sk:1,sl:1,sq:1,sr:1,'sr-latn':1,sv:1,th:1,tr:1,tt:1,ug:1,uk:1,vi:1,zh:1,'zh-cn':1 },
	// jscs:enable
	requires: 'dialog',
	init: function( editor ) {
		var pluginName = 'specialchar',
			plugin = this;

		// Register the dialog.
		CKEDITOR.dialog.add( pluginName, this.path + 'dialogs/specialchar.js' );

		editor.addCommand( pluginName, {
			exec: function() {
				var langCode = editor.langCode;
				langCode =
					plugin.availableLangs[ langCode ] ? langCode :
					plugin.availableLangs[ langCode.replace( /-.*/, '' ) ] ? langCode.replace( /-.*/, '' ) :
					'en';

				CKEDITOR.scriptLoader.load( CKEDITOR.getUrl( plugin.path + 'dialogs/lang/' + langCode + '.js' ), function() {
					CKEDITOR.tools.extend( editor.lang.specialchar, plugin.langEntries[ langCode ] );
					editor.openDialog( pluginName );
				} );
			},
			modes: { wysiwyg: 1 },
			canUndo: false
		} );

		// Register the toolbar button.
		editor.ui.addButton && editor.ui.addButton( 'SpecialChar', {
			label: editor.lang.specialchar.toolbar,
			command: pluginName,
			toolbar: 'insert,50'
		} );
	}
} );

/**
 * The list of special characters visible in the "Special Character" dialog window.
 *
 *		config.specialChars = [ '&quot;', '&rsquo;', [ '&custom;', 'Custom label' ] ];
 *		config.specialChars = config.specialChars.concat( [ '&quot;', [ '&rsquo;', 'Custom label' ] ] );
 *
 * @cfg
 * @member CKEDITOR.config
 */
CKEDITOR.config.specialChars = [
	'!', '&quot;', '#', '$', '%', '&amp;', "'", '(', ')', '*', '+', '-', '.', '/',
	'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', ':', ';',
	'&lt;', '=', '&gt;', '?', '@',
	'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
	'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
	'[', ']', '^', '_', '`',
	'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p',
	'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
	'{', '|', '}', '~',
	'&euro;', '&lsquo;', '&rsquo;', '&ldquo;', '&rdquo;', '&ndash;', '&mdash;', '&iexcl;', '&cent;', '&pound;',
	'&curren;', '&yen;', '&brvbar;', '&sect;', '&uml;', '&copy;', '&ordf;', '&laquo;', '&not;', '&reg;', '&macr;',
	'&deg;', '&sup2;', '&sup3;', '&acute;', '&micro;', '&para;', '&middot;', '&cedil;', '&sup1;', '&ordm;', '&raquo;',
	'&frac14;', '&frac12;', '&frac34;', '&iquest;', '&Agrave;', '&Aacute;', '&Acirc;', '&Atilde;', '&Auml;', '&Aring;',
	'&AElig;', '&Ccedil;', '&Egrave;', '&Eacute;', '&Ecirc;', '&Euml;', '&Igrave;', '&Iacute;', '&Icirc;', '&Iuml;',
	'&ETH;', '&Ntilde;', '&Ograve;', '&Oacute;', '&Ocirc;', '&Otilde;', '&Ouml;', '&times;', '&Oslash;', '&Ugrave;',
	'&Uacute;', '&Ucirc;', '&Uuml;', '&Yacute;', '&THORN;', '&szlig;', '&agrave;', '&aacute;', '&acirc;', '&atilde;',
	'&auml;', '&aring;', '&aelig;', '&ccedil;', '&egrave;', '&eacute;', '&ecirc;', '&euml;', '&igrave;', '&iacute;',
	'&icirc;', '&iuml;', '&eth;', '&ntilde;', '&ograve;', '&oacute;', '&ocirc;', '&otilde;', '&ouml;', '&divide;',
	'&oslash;', '&ugrave;', '&uacute;', '&ucirc;', '&uuml;', '&yacute;', '&thorn;', '&yuml;', '&OElig;', '&oelig;',
	'&#372;', '&#374', '&#373', '&#375;', '&sbquo;', '&#8219;', '&bdquo;', '&hellip;', '&trade;', '&#9658;', '&bull;',
	'&rarr;', '&rArr;', '&hArr;', '&diams;', '&asymp;'
];

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

( function() {
	'use strict';

	CKEDITOR.plugins.add( 'stylescombo', {
		requires: 'richcombo',
		// jscs:disable maximumLineLength
		// jscs:enable maximumLineLength

		init: function( editor ) {
			var config = editor.config,
				lang = editor.lang.stylescombo,
				styles = {},
				stylesList = [],
				combo,
				allowedContent = [];

			editor.on( 'stylesSet', function( evt ) {
				var stylesDefinitions = evt.data.styles;

				if ( !stylesDefinitions )
					return;

				var style, styleName, styleType;

				// Put all styles into an Array.
				for ( var i = 0, count = stylesDefinitions.length; i < count; i++ ) {
					var styleDefinition = stylesDefinitions[ i ];

					if ( editor.blockless && ( styleDefinition.element in CKEDITOR.dtd.$block ) ||
						( typeof styleDefinition.type == 'string' && !CKEDITOR.style.customHandlers[ styleDefinition.type ] ) ) {

						continue;
					}

					styleName = styleDefinition.name;
					style = new CKEDITOR.style( styleDefinition );

					if ( !editor.filter.customConfig || editor.filter.check( style ) ) {
						style._name = styleName;
						style._.enterMode = config.enterMode;
						// Get the type (which will be used to assign style to one of 3 groups) from assignedTo if it's defined.
						style._.type = styleType = style.assignedTo || style.type;

						// Weight is used to sort styles (https://dev.ckeditor.com/ticket/9029).
						style._.weight = i + ( styleType == CKEDITOR.STYLE_OBJECT ? 1 : styleType == CKEDITOR.STYLE_BLOCK ? 2 : 3 ) * 1000;

						styles[ styleName ] = style;
						stylesList.push( style );
						allowedContent.push( style );
					}
				}

				// Sorts the Array, so the styles get grouped by type in proper order (https://dev.ckeditor.com/ticket/9029).
				stylesList.sort( function( styleA, styleB ) {
					return styleA._.weight - styleB._.weight;
				} );
			} );

			editor.ui.addRichCombo( 'Styles', {
				label: lang.label,
				title: lang.panelTitle,
				toolbar: 'styles,10',
				allowedContent: allowedContent,

				panel: {
					css: [ CKEDITOR.skin.getPath( 'editor' ) ].concat( config.contentsCss ),
					multiSelect: true,
					attributes: { 'aria-label': lang.panelTitle }
				},

				init: function() {
					var style, styleName, lastType, type, i, count;

					// Loop over the Array, adding all items to the
					// combo.
					for ( i = 0, count = stylesList.length; i < count; i++ ) {
						style = stylesList[ i ];
						styleName = style._name;
						type = style._.type;

						if ( type != lastType ) {
							this.startGroup( lang[ 'panelTitle' + String( type ) ] );
							lastType = type;
						}

						this.add( styleName, style.type == CKEDITOR.STYLE_OBJECT ? styleName : style.buildPreview(), styleName );
					}

					this.commit();
				},

				onClick: function( value ) {
					editor.focus();
					editor.fire( 'saveSnapshot' );

					var style = styles[ value ],
						elementPath = editor.elementPath();

					// When more then one style from the same group is active ( which is not ok ),
					// remove all other styles from this group and apply selected style.
					if ( style.group && style.removeStylesFromSameGroup( editor ) ) {
						editor.applyStyle( style );
					} else {
						editor[ style.checkActive( elementPath, editor ) ? 'removeStyle' : 'applyStyle' ]( style );
					}

					editor.fire( 'saveSnapshot' );
				},

				onRender: function() {
					editor.on( 'selectionChange', function( ev ) {
						var currentValue = this.getValue(),
							elementPath = ev.data.path,
							elements = elementPath.elements;

						// For each element into the elements path.
						for ( var i = 0, count = elements.length, element; i < count; i++ ) {
							element = elements[ i ];

							// Check if the element is removable by any of
							// the styles.
							for ( var value in styles ) {
								if ( styles[ value ].checkElementRemovable( element, true, editor ) ) {
									if ( value != currentValue )
										this.setValue( value );
									return;
								}
							}
						}

						// If no styles match, just empty it.
						this.setValue( '' );
					}, this );
				},

				onOpen: function() {
					var selection = editor.getSelection(),
						// When editor is focused but is returned `null` as selected element, then return editable (#646).
						// In case when selection dosen't cover whole element, we try to return element where selection starts (#862).
						element = selection.getSelectedElement() || selection.getStartElement() || editor.editable(),
						elementPath = editor.elementPath( element ),
						counter = [ 0, 0, 0, 0 ];

					this.showAll();
					this.unmarkAll();
					for ( var name in styles ) {
						var style = styles[ name ],
							type = style._.type;

						if ( style.checkApplicable( elementPath, editor, editor.activeFilter ) )
							counter[ type ]++;
						else
							this.hideItem( name );

						if ( style.checkActive( elementPath, editor ) )
							this.mark( name );
					}

					if ( !counter[ CKEDITOR.STYLE_BLOCK ] )
						this.hideGroup( lang[ 'panelTitle' + String( CKEDITOR.STYLE_BLOCK ) ] );

					if ( !counter[ CKEDITOR.STYLE_INLINE ] )
						this.hideGroup( lang[ 'panelTitle' + String( CKEDITOR.STYLE_INLINE ) ] );

					if ( !counter[ CKEDITOR.STYLE_OBJECT ] )
						this.hideGroup( lang[ 'panelTitle' + String( CKEDITOR.STYLE_OBJECT ) ] );
				},

				refresh: function() {
					var elementPath = editor.elementPath();

					if ( !elementPath )
						return;

					for ( var name in styles ) {
						var style = styles[ name ];

						if ( style.checkApplicable( elementPath, editor, editor.activeFilter ) )
							return;
					}
					this.setState( CKEDITOR.TRISTATE_DISABLED );
				},

				// Force a reload of the data
				reset: function() {
					if ( combo ) {
						delete combo._.panel;
						delete combo._.list;
						combo._.committed = 0;
						combo._.items = {};
						combo._.state = CKEDITOR.TRISTATE_OFF;
					}
					styles = {};
					stylesList = [];
				}
			} );
		}
	} );
} )();

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

( function() {
	var meta = {
		editorFocus: false,
		modes: { wysiwyg: 1, source: 1 }
	};

	var blurCommand = {
		exec: function( editor ) {
			editor.container.focusNext( true, editor.tabIndex );
		}
	};

	var blurBackCommand = {
		exec: function( editor ) {
			editor.container.focusPrevious( true, editor.tabIndex );
		}
	};

	function selectNextCellCommand( backward ) {
		return {
			editorFocus: false,
			canUndo: false,
			modes: { wysiwyg: 1 },
			exec: function( editor ) {
				if ( editor.editable().hasFocus ) {
					var sel = editor.getSelection(),
						path = new CKEDITOR.dom.elementPath( sel.getCommonAncestor(), sel.root ),
						cell;

					if ( ( cell = path.contains( { td: 1, th: 1 }, 1 ) ) ) {
						var resultRange = editor.createRange(),
							next = CKEDITOR.tools.tryThese( function() {
								var row = cell.getParent(),
									next = row.$.cells[ cell.$.cellIndex + ( backward ? -1 : 1 ) ];

								// Invalid any empty value.
								next.parentNode.parentNode;
								return next;
							}, function() {
								var row = cell.getParent(),
									table = row.getAscendant( 'table' ),
									nextRow = table.$.rows[ row.$.rowIndex + ( backward ? -1 : 1 ) ];

								return nextRow.cells[ backward ? nextRow.cells.length - 1 : 0 ];
							} );

						// Clone one more row at the end of table and select the first newly established cell.
						if ( !( next || backward ) ) {
							var table = cell.getAscendant( 'table' ).$,
								cells = cell.getParent().$.cells;

							var newRow = new CKEDITOR.dom.element( table.insertRow( -1 ), editor.document );

							for ( var i = 0, count = cells.length; i < count; i++ ) {
								var newCell = newRow.append( new CKEDITOR.dom.element( cells[ i ], editor.document ).clone( false, false ) );
								newCell.appendBogus();
							}

							resultRange.moveToElementEditStart( newRow );
						} else if ( next ) {
							next = new CKEDITOR.dom.element( next );
							resultRange.moveToElementEditStart( next );
							// Avoid selecting empty block makes the cursor blind.
							if ( !( resultRange.checkStartOfBlock() && resultRange.checkEndOfBlock() ) )
								resultRange.selectNodeContents( next );
						} else {
							return true;
						}

						resultRange.select( true );
						return true;
					}
				}

				return false;
			}
		};
	}

	CKEDITOR.plugins.add( 'tab', {
		init: function( editor ) {
			var tabTools = editor.config.enableTabKeyTools !== false,
				tabSpaces = editor.config.tabSpaces || 0,
				tabText = '';

			while ( tabSpaces-- )
				tabText += '\xa0';

			if ( tabText ) {
				editor.on( 'key', function( ev ) {
					// TAB.
					if ( ev.data.keyCode == 9 ) {
						editor.insertText( tabText );
						ev.cancel();
					}
				} );
			}

			if ( tabTools ) {
				editor.on( 'key', function( ev ) {
					if ( ev.data.keyCode == 9 && editor.execCommand( 'selectNextCell' ) || // TAB
					ev.data.keyCode == ( CKEDITOR.SHIFT + 9 ) && editor.execCommand( 'selectPreviousCell' ) ) // SHIFT+TAB
					ev.cancel();
				} );
			}

			editor.addCommand( 'blur', CKEDITOR.tools.extend( blurCommand, meta ) );
			editor.addCommand( 'blurBack', CKEDITOR.tools.extend( blurBackCommand, meta ) );
			editor.addCommand( 'selectNextCell', selectNextCellCommand() );
			editor.addCommand( 'selectPreviousCell', selectNextCellCommand( true ) );
		}
	} );
} )();

/**
 * Moves the UI focus to the element following this element in the tabindex order.
 *
 *		var element = CKEDITOR.document.getById( 'example' );
 *		element.focusNext();
 *
 * @param {Boolean} [ignoreChildren=false]
 * @param {Number} [indexToUse]
 * @member CKEDITOR.dom.element
 */
CKEDITOR.dom.element.prototype.focusNext = function( ignoreChildren, indexToUse ) {
	var curTabIndex = ( indexToUse === undefined ? this.getTabIndex() : indexToUse ),
		passedCurrent, enteredCurrent, elected, electedTabIndex, element, elementTabIndex;

	if ( curTabIndex <= 0 ) {
		// If this element has tabindex <= 0 then we must simply look for any
		// element following it containing tabindex=0.

		element = this.getNextSourceNode( ignoreChildren, CKEDITOR.NODE_ELEMENT );

		while ( element ) {
			if ( element.isVisible() && element.getTabIndex() === 0 ) {
				elected = element;
				break;
			}

			element = element.getNextSourceNode( false, CKEDITOR.NODE_ELEMENT );
		}
	} else {
		// If this element has tabindex > 0 then we must look for:
		//		1. An element following this element with the same tabindex.
		//		2. The first element in source other with the lowest tabindex
		//		   that is higher than this element tabindex.
		//		3. The first element with tabindex=0.

		element = this.getDocument().getBody().getFirst();

		while ( ( element = element.getNextSourceNode( false, CKEDITOR.NODE_ELEMENT ) ) ) {
			if ( !passedCurrent ) {
				if ( !enteredCurrent && element.equals( this ) ) {
					enteredCurrent = true;

					// Ignore this element, if required.
					if ( ignoreChildren ) {
						if ( !( element = element.getNextSourceNode( true, CKEDITOR.NODE_ELEMENT ) ) )
							break;
						passedCurrent = 1;
					}
				} else if ( enteredCurrent && !this.contains( element ) ) {
					passedCurrent = 1;
				}
			}

			if ( !element.isVisible() || ( elementTabIndex = element.getTabIndex() ) < 0 )
				continue;

			if ( passedCurrent && elementTabIndex == curTabIndex ) {
				elected = element;
				break;
			}

			if ( elementTabIndex > curTabIndex && ( !elected || !electedTabIndex || elementTabIndex < electedTabIndex ) ) {
				elected = element;
				electedTabIndex = elementTabIndex;
			} else if ( !elected && elementTabIndex === 0 ) {
				elected = element;
				electedTabIndex = elementTabIndex;
			}
		}
	}

	if ( elected )
		elected.focus();
};

/**
 * Moves the UI focus to the element before this element in the tabindex order.
 *
 *		var element = CKEDITOR.document.getById( 'example' );
 *		element.focusPrevious();
 *
 * @param {Boolean} [ignoreChildren=false]
 * @param {Number} [indexToUse]
 * @member CKEDITOR.dom.element
 */
CKEDITOR.dom.element.prototype.focusPrevious = function( ignoreChildren, indexToUse ) {
	var curTabIndex = ( indexToUse === undefined ? this.getTabIndex() : indexToUse ),
		passedCurrent, enteredCurrent, elected,
		electedTabIndex = 0,
		elementTabIndex;

	var element = this.getDocument().getBody().getLast();

	while ( ( element = element.getPreviousSourceNode( false, CKEDITOR.NODE_ELEMENT ) ) ) {
		if ( !passedCurrent ) {
			if ( !enteredCurrent && element.equals( this ) ) {
				enteredCurrent = true;

				// Ignore this element, if required.
				if ( ignoreChildren ) {
					if ( !( element = element.getPreviousSourceNode( true, CKEDITOR.NODE_ELEMENT ) ) )
						break;
					passedCurrent = 1;
				}
			} else if ( enteredCurrent && !this.contains( element ) ) {
				passedCurrent = 1;
			}
		}

		if ( !element.isVisible() || ( elementTabIndex = element.getTabIndex() ) < 0 )
			continue;

		if ( curTabIndex <= 0 ) {
			// If this element has tabindex <= 0 then we must look for:
			//		1. An element before this one containing tabindex=0.
			//		2. The last element with the highest tabindex.

			if ( passedCurrent && elementTabIndex === 0 ) {
				elected = element;
				break;
			}

			if ( elementTabIndex > electedTabIndex ) {
				elected = element;
				electedTabIndex = elementTabIndex;
			}
		} else {
			// If this element has tabindex > 0 we must look for:
			//		1. An element preceeding this one, with the same tabindex.
			//		2. The last element in source other with the highest tabindex
			//		   that is lower than this element tabindex.

			if ( passedCurrent && elementTabIndex == curTabIndex ) {
				elected = element;
				break;
			}

			if ( elementTabIndex < curTabIndex && ( !elected || elementTabIndex > electedTabIndex ) ) {
				elected = element;
				electedTabIndex = elementTabIndex;
			}
		}
	}

	if ( elected )
		elected.focus();
};

/**
 * Intructs the editor to add a number of spaces (`&nbsp;`) to the text when
 * hitting the <kbd>Tab</kbd> key. If set to zero, the <kbd>Tab</kbd> key will be used to move the
 * cursor focus to the next element in the page, out of the editor focus.
 *
 *		config.tabSpaces = 4;
 *
 * @cfg {Number} [tabSpaces=0]
 * @member CKEDITOR.config
 */

/**
 * Allow context-sensitive <kbd>Tab</kbd> key behaviors, including the following scenarios:
 *
 * When selection is anchored inside **table cells**:
 *
 * * If <kbd>Tab</kbd> is pressed, select the content of the "next" cell. If in the last
 *     cell in the table, add a new row to it and focus its first cell.
 * * If <kbd>Shift+Tab</kbd> is pressed, select the content of the "previous" cell.
 *     Do nothing when it is in the first cell.
 *
 * Example:
 *
 *		config.enableTabKeyTools = false;
 *
 * @cfg {Boolean} [enableTabKeyTools=true]
 * @member CKEDITOR.config
 */

// If the <kbd>Tab</kbd> key is not supposed to be enabled for navigation, the following
// settings could be used alternatively:
// config.keystrokes.push(
//	[ CKEDITOR.ALT + 38 /*Arrow Up*/, 'selectPreviousCell' ],
//	[ CKEDITOR.ALT + 40 /*Arrow Down*/, 'selectNextCell' ]
// );

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

CKEDITOR.plugins.add( 'table', {
	requires: 'dialog',
	// jscs:disable maximumLineLength
	// jscs:enable maximumLineLength
	init: function( editor ) {
		if ( editor.blockless )
			return;

		var lang = editor.lang.table;

		editor.addCommand( 'table', new CKEDITOR.dialogCommand( 'table', {
			context: 'table',
			allowedContent: 'table{width,height,border-collapse}[align,border,cellpadding,cellspacing,summary];' +
				'caption tbody thead tfoot;' +
				'th td tr[scope];' +
				'td{border*,background-color,vertical-align,width,height}[colspan,rowspan];' +
				( editor.plugins.dialogadvtab ? 'table' + editor.plugins.dialogadvtab.allowedContent() : '' ),
			requiredContent: 'table',
			contentTransformations: [
				[ 'table{width}: sizeToStyle', 'table[width]: sizeToAttribute' ],
				[ 'td: splitBorderShorthand' ],
				[ {
					element: 'table',
					right: function( element ) {
						if ( element.styles ) {
							var parsedStyle;
							if ( element.styles.border ) {
								parsedStyle = CKEDITOR.tools.style.parse.border( element.styles.border );
							} else if ( CKEDITOR.env.ie && CKEDITOR.env.version === 8 ) {
								var styleData = element.styles;
								// Workaround for IE8 browser. It transforms CSS border shorthand property
								// to the longer one, consisting of border-top, border-right, etc. We have to check
								// if all those properties exists and have the same value (#566).
								if ( styleData[ 'border-left' ] && styleData[ 'border-left' ] === styleData[ 'border-right' ] &&
									styleData[ 'border-right' ] === styleData[ 'border-top' ] &&
									styleData[ 'border-top' ] === styleData[ 'border-bottom' ] ) {

									parsedStyle = CKEDITOR.tools.style.parse.border( styleData[ 'border-top' ] );
								}
							}
							if ( parsedStyle && parsedStyle.style && parsedStyle.style === 'solid' &&
								parsedStyle.width && parseFloat( parsedStyle.width ) !== 0 ) {
								element.attributes.border = 1;
							}
							if ( element.styles[ 'border-collapse' ] == 'collapse' ) {
								element.attributes.cellspacing = 0;
							}
						}
					}
				} ]
			]
		} ) );

		function createDef( def ) {
			return CKEDITOR.tools.extend( def || {}, {
				contextSensitive: 1,
				refresh: function( editor, path ) {
					this.setState( path.contains( 'table', 1 ) ? CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED );
				}
			} );
		}

		editor.addCommand( 'tableProperties', new CKEDITOR.dialogCommand( 'tableProperties', createDef() ) );
		editor.addCommand( 'tableDelete', createDef( {
			exec: function( editor ) {
				var path = editor.elementPath(),
					table = path.contains( 'table', 1 );

				if ( !table )
					return;

				// If the table's parent has only one child remove it as well (unless it's a table cell, or the editable element)
				//(https://dev.ckeditor.com/ticket/5416, https://dev.ckeditor.com/ticket/6289, https://dev.ckeditor.com/ticket/12110)
				var parent = table.getParent(),
					editable = editor.editable();

				if ( parent.getChildCount() == 1 && !parent.is( 'td', 'th' ) && !parent.equals( editable ) )
					table = parent;

				var range = editor.createRange();
				range.moveToPosition( table, CKEDITOR.POSITION_BEFORE_START );
				table.remove();
				range.select();
			}
		} ) );

		editor.ui.addButton && editor.ui.addButton( 'Table', {
			label: lang.toolbar,
			command: 'table',
			toolbar: 'insert,30'
		} );

		CKEDITOR.dialog.add( 'table', this.path + 'dialogs/table.js' );
		CKEDITOR.dialog.add( 'tableProperties', this.path + 'dialogs/table.js' );

		// If the "menu" plugin is loaded, register the menu items.
		if ( editor.addMenuItems ) {
			editor.addMenuItems( {
				table: {
					label: lang.menu,
					command: 'tableProperties',
					group: 'table',
					order: 5
				},

				tabledelete: {
					label: lang.deleteTable,
					command: 'tableDelete',
					group: 'table',
					order: 1
				}
			} );
		}

		editor.on( 'doubleclick', function( evt ) {
			var element = evt.data.element;

			if ( element.is( 'table' ) )
				evt.data.dialog = 'tableProperties';
		} );

		// If the "contextmenu" plugin is loaded, register the listeners.
		if ( editor.contextMenu ) {
			editor.contextMenu.addListener( function() {
				// menu item state is resolved on commands.
				return {
					tabledelete: CKEDITOR.TRISTATE_OFF,
					table: CKEDITOR.TRISTATE_OFF
				};
			} );
		}
	}
} );

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

( function() {
	var cellNodeRegex = /^(?:td|th)$/,
		isArray = CKEDITOR.tools.isArray;

	function getSelectedCells( selection, table ) {
		var retval = [],
			database = {};

		if ( !selection ) {
			return retval;
		}

		var ranges = selection.getRanges();

		function isInTable( cell ) {
			if ( !table ) {
				return true;
			}

			return table.contains( cell ) && cell.getAscendant( 'table', true ).equals( table );
		}

		function moveOutOfCellGuard( node ) {
			// Apply to the first cell only.
			if ( retval.length > 0 )
				return;

			// If we are exiting from the first </td>, then the td should definitely be
			// included.
			if ( node.type == CKEDITOR.NODE_ELEMENT && cellNodeRegex.test( node.getName() ) && !node.getCustomData( 'selected_cell' ) ) {
				CKEDITOR.dom.element.setMarker( database, node, 'selected_cell', true );
				retval.push( node );
			}
		}

		for ( var i = 0; i < ranges.length; i++ ) {
			var range = ranges[ i ];

			if ( range.collapsed ) {
				// Walker does not handle collapsed ranges yet - fall back to old API.
				var startNode = range.getCommonAncestor();
				var nearestCell = startNode.getAscendant( { td: 1, th: 1 }, true );
				if ( nearestCell && isInTable( nearestCell ) ) {
					retval.push( nearestCell );
				}
			} else {
				var walker = new CKEDITOR.dom.walker( range );
				var node;
				walker.guard = moveOutOfCellGuard;

				while ( ( node = walker.next() ) ) {
					// If may be possible for us to have a range like this:
					// <td>^1</td><td>^2</td>
					// The 2nd td shouldn't be included.
					//
					// So we have to take care to include a td we've entered only when we've
					// walked into its children.

					if ( node.type != CKEDITOR.NODE_ELEMENT || !node.is( CKEDITOR.dtd.table ) ) {
						var parent = node.getAscendant( { td: 1, th: 1 }, true );
						if ( parent && !parent.getCustomData( 'selected_cell' ) && isInTable( parent ) ) {
							CKEDITOR.dom.element.setMarker( database, parent, 'selected_cell', true );
							retval.push( parent );
						}
					}
				}
			}
		}

		CKEDITOR.dom.element.clearAllMarkers( database );

		return retval;
	}

	function getFocusElementAfterDelCells( cellsToDelete ) {
		var i = 0,
			last = cellsToDelete.length - 1,
			database = {},
			cell, focusedCell, tr;

		while ( ( cell = cellsToDelete[ i++ ] ) )
			CKEDITOR.dom.element.setMarker( database, cell, 'delete_cell', true );

		// 1.first we check left or right side focusable cell row by row;
		i = 0;
		while ( ( cell = cellsToDelete[ i++ ] ) ) {
			if ( ( focusedCell = cell.getPrevious() ) && !focusedCell.getCustomData( 'delete_cell' ) || ( focusedCell = cell.getNext() ) && !focusedCell.getCustomData( 'delete_cell' ) ) {
				CKEDITOR.dom.element.clearAllMarkers( database );
				return focusedCell;
			}
		}

		CKEDITOR.dom.element.clearAllMarkers( database );

		// 2. then we check the toppest row (outside the selection area square) focusable cell
		tr = cellsToDelete[ 0 ].getParent();
		if ( ( tr = tr.getPrevious() ) )
			return tr.getLast();

		// 3. last we check the lowerest  row focusable cell
		tr = cellsToDelete[ last ].getParent();
		if ( ( tr = tr.getNext() ) )
			return tr.getChild( 0 );

		return null;
	}

	function insertRow( selectionOrCells, insertBefore ) {
		var cells = isArray( selectionOrCells ) ? selectionOrCells : getSelectedCells( selectionOrCells ),
			firstCell = cells[ 0 ],
			table = firstCell.getAscendant( 'table' ),
			doc = firstCell.getDocument(),
			startRow = cells[ 0 ].getParent(),
			startRowIndex = startRow.$.rowIndex,
			lastCell = cells[ cells.length - 1 ],
			endRowIndex = lastCell.getParent().$.rowIndex + lastCell.$.rowSpan - 1,
			endRow = new CKEDITOR.dom.element( table.$.rows[ endRowIndex ] ),
			rowIndex = insertBefore ? startRowIndex : endRowIndex,
			row = insertBefore ? startRow : endRow;

		var map = CKEDITOR.tools.buildTableMap( table ),
			cloneRow = map[ rowIndex ],
			nextRow = insertBefore ? map[ rowIndex - 1 ] : map[ rowIndex + 1 ],
			width = map[ 0 ].length;

		var newRow = doc.createElement( 'tr' );
		for ( var i = 0; cloneRow[ i ] && i < width; i++ ) {
			var cell;
			// Check whether there's a spanning row here, do not break it.
			if ( cloneRow[ i ].rowSpan > 1 && nextRow && cloneRow[ i ] == nextRow[ i ] ) {
				cell = cloneRow[ i ];
				cell.rowSpan += 1;
			} else {
				cell = new CKEDITOR.dom.element( cloneRow[ i ] ).clone();
				cell.removeAttribute( 'rowSpan' );
				cell.appendBogus();
				newRow.append( cell );
				cell = cell.$;
			}

			i += cell.colSpan - 1;
		}

		insertBefore ? newRow.insertBefore( row ) : newRow.insertAfter( row );

		return newRow;
	}

	function deleteRows( selectionOrRow ) {
		if ( selectionOrRow instanceof CKEDITOR.dom.selection ) {
			var ranges = selectionOrRow.getRanges(),
				cells = getSelectedCells( selectionOrRow ),
				firstCell = cells[ 0 ],
				table = firstCell.getAscendant( 'table' ),
				map = CKEDITOR.tools.buildTableMap( table ),
				startRow = cells[ 0 ].getParent(),
				startRowIndex = startRow.$.rowIndex,
				lastCell = cells[ cells.length - 1 ],
				endRowIndex = lastCell.getParent().$.rowIndex + lastCell.$.rowSpan - 1,
				rowsToDelete = [];

			selectionOrRow.reset();

			// Delete cell or reduce cell spans by checking through the table map.
			for ( var i = startRowIndex; i <= endRowIndex; i++ ) {
				var mapRow = map[ i ],
					row = new CKEDITOR.dom.element( table.$.rows[ i ] );

				for ( var j = 0; j < mapRow.length; j++ ) {
					var cell = new CKEDITOR.dom.element( mapRow[ j ] ),
						cellRowIndex = cell.getParent().$.rowIndex;

					if ( cell.$.rowSpan == 1 )
						cell.remove();
					// Row spanned cell.
					else {
						// Span row of the cell, reduce spanning.
						cell.$.rowSpan -= 1;
						// Root row of the cell, root cell to next row.
						if ( cellRowIndex == i ) {
							var nextMapRow = map[ i + 1 ];
							nextMapRow[ j - 1 ] ? cell.insertAfter( new CKEDITOR.dom.element( nextMapRow[ j - 1 ] ) ) : new CKEDITOR.dom.element( table.$.rows[ i + 1 ] ).append( cell, 1 );
						}
					}

					j += cell.$.colSpan - 1;
				}

				rowsToDelete.push( row );
			}

			var rows = table.$.rows;

			// After deleting whole table, the selection would be broken,
			// therefore it's safer to move it outside the table first.
			ranges[ 0 ].moveToPosition( table, CKEDITOR.POSITION_BEFORE_START );

			// Where to put the cursor after rows been deleted?
			// 1. Into next sibling row if any;
			// 2. Into previous sibling row if any;
			// 3. Into table's parent element if it's the very last row.
			var cursorPosition = new CKEDITOR.dom.element( rows[ endRowIndex + 1 ] || ( startRowIndex > 0 ? rows[ startRowIndex - 1 ] : null ) || table.$.parentNode );

			for ( i = rowsToDelete.length; i >= 0; i-- ) {
				deleteRows( rowsToDelete[ i ] );
			}

			// If all the rows were removed, table gets removed too.
			if ( !table.$.parentNode ) {
				ranges[ 0 ].select();
				return null;
			}

			return cursorPosition;
		} else if ( selectionOrRow instanceof CKEDITOR.dom.element ) {
			table = selectionOrRow.getAscendant( 'table' );

			if ( table.$.rows.length == 1 ) {
				table.remove();
			} else {
				selectionOrRow.remove();
			}
		}

		return null;
	}

	function getCellColIndex( cell ) {
		var row = cell.getParent(),
			rowCells = row.$.cells;

		var colIndex = 0;
		for ( var i = 0; i < rowCells.length; i++ ) {
			var mapCell = rowCells[ i ];

			// Not always adding colSpan results in wrong position
			// of newly inserted column. (#591) (https://dev.ckeditor.com/ticket/13729)
			colIndex += mapCell.colSpan;
			if ( mapCell == cell.$ )
				break;
		}

		return colIndex - 1;
	}

	function getColumnsIndices( cells, isStart ) {
		var retval = isStart ? Infinity : 0;
		for ( var i = 0; i < cells.length; i++ ) {
			var colIndex = getCellColIndex( cells[ i ] );
			if ( isStart ? colIndex < retval : colIndex > retval )
				retval = colIndex;
		}
		return retval;
	}

	function insertColumn( selectionOrCells, insertBefore ) {
		var cells = isArray( selectionOrCells ) ? selectionOrCells : getSelectedCells( selectionOrCells ),
			firstCell = cells[ 0 ],
			table = firstCell.getAscendant( 'table' ),
			startCol = getColumnsIndices( cells, 1 ),
			lastCol = getColumnsIndices( cells ),
			colIndex = insertBefore ? startCol : lastCol,
			originalCell;

		var map = CKEDITOR.tools.buildTableMap( table ),
			cloneCol = [],
			nextCol = [],
			addedCells = [],
			height = map.length;

		for ( var i = 0; i < height; i++ ) {
			cloneCol.push( map[ i ][ colIndex ] );
			var nextCell = insertBefore ? map[ i ][ colIndex - 1 ] : map[ i ][ colIndex + 1 ];
			nextCol.push( nextCell );
		}

		for ( i = 0; i < height; i++ ) {
			var cell;

			if ( !cloneCol[ i ] )
				continue;

			// Check whether there's a spanning column here, do not break it.
			if ( cloneCol[ i ].colSpan > 1 && nextCol[ i ] == cloneCol[ i ] ) {
				cell = cloneCol[ i ];
				cell.colSpan += 1;
			} else {
				originalCell = new CKEDITOR.dom.element( cloneCol[ i ] );
				cell = originalCell.clone();
				cell.removeAttribute( 'colSpan' );
				cell.appendBogus();
				cell[ insertBefore ? 'insertBefore' : 'insertAfter' ].call( cell, originalCell );
				addedCells.push( cell );
				cell = cell.$;
			}

			i += cell.rowSpan - 1;
		}

		return addedCells;
	}

	function deleteColumns( selection ) {
		function processSelection( selection ) {
			// If selection leak to next td/th cell, then preserve it in previous cell.

			var ranges,
				range,
				endNode,
				endNodeName,
				previous;

			ranges = selection.getRanges();
			if ( ranges.length !== 1 ) {
				return selection;
			}

			range = ranges[0];
			if ( range.collapsed || range.endOffset !== 0 ) {
				return selection;
			}

			endNode = range.endContainer;
			endNodeName = endNode.getName().toLowerCase();
			if ( !( endNodeName === 'td' || endNodeName === 'th' ) ) {
				return selection;
			}

			// Get previous td/th element or the last from previous row.
			previous = endNode.getPrevious();
			if ( !previous ) {
				previous = endNode.getParent().getPrevious().getLast();
			}

			// Get most inner text node or br in case of empty cell.
			while ( previous.type !== CKEDITOR.NODE_TEXT && previous.getName().toLowerCase() !== 'br' ) {
				previous = previous.getLast();
				// Generraly previous should never be null, if statement is just for possible weird edge cases.
				if ( !previous ) {
					return selection;
				}
			}

			range.setEndAt( previous, CKEDITOR.POSITION_BEFORE_END );
			return range.select();
		}

		// Problem occures only on webkit in case of native selection (#577).
		// Upstream: https://bugs.webkit.org/show_bug.cgi?id=175131, https://bugs.chromium.org/p/chromium/issues/detail?id=752091
		if ( CKEDITOR.env.webkit && !selection.isFake ) {
			selection = processSelection( selection );
		}

		var ranges = selection.getRanges(),
			cells = getSelectedCells( selection ),
			firstCell = cells[ 0 ],
			lastCell = cells[ cells.length - 1 ],
			table = firstCell.getAscendant( 'table' ),
			map = CKEDITOR.tools.buildTableMap( table ),
			startColIndex, endColIndex,
			rowsToDelete = [];

		selection.reset();

		// Figure out selected cells' column indices.
		for ( var i = 0, rows = map.length; i < rows; i++ ) {
			for ( var j = 0, cols = map[ i ].length; j < cols; j++ ) {
				// #577
				// Map might contain multiple times this same element, because of existings collspan.
				// We don't want to overwrite startIndex in such situation and take first one.
				if ( startColIndex === undefined && map[ i ][ j ] == firstCell.$ ) {
					startColIndex = j;
				}
				if ( map[ i ][ j ] == lastCell.$ ) {
					endColIndex = j;
				}
			}
		}

		// Delete cell or reduce cell spans by checking through the table map.
		for ( i = startColIndex; i <= endColIndex; i++ ) {
			for ( j = 0; j < map.length; j++ ) {
				var mapRow = map[ j ],
					row = new CKEDITOR.dom.element( table.$.rows[ j ] ),
					cell = new CKEDITOR.dom.element( mapRow[ i ] );

				if ( cell.$ ) {
					if ( cell.$.colSpan == 1 ) {
						cell.remove();
					} else {
						// Reduce the col spans.
						cell.$.colSpan -= 1;
					}

					j += cell.$.rowSpan - 1;

					if ( !row.$.cells.length ) {
						rowsToDelete.push( row );
					}
				}
			}
		}

		// Where to put the cursor after columns been deleted?
		// 1. Into next cell of the first row if any;
		// 2. Into previous cell of the first row if any;
		// 3. Into table's parent element;
		var cursorPosition;
		if ( map[ 0 ].length - 1 > endColIndex ) {
			cursorPosition = new CKEDITOR.dom.element( map[ 0 ][ endColIndex + 1 ] );
		} else if ( startColIndex && map[ 0 ][ startColIndex - 1 ].cellIndex !== -1 ) {
			cursorPosition = new CKEDITOR.dom.element( map[ 0 ][ startColIndex - 1 ] );
		} else {
			cursorPosition = new CKEDITOR.dom.element( table.$.parentNode );
		}

		// Delete table rows only if all columns are gone (do not remove empty row).
		if ( rowsToDelete.length == rows ) {
			// After deleting whole table, the selection would be broken,
			// therefore it's safer to move it outside the table first.
			ranges[ 0 ].moveToPosition( table, CKEDITOR.POSITION_AFTER_END );
			ranges[ 0 ].select();

			table.remove();
		}

		return cursorPosition;
	}

	function insertCell( selection, insertBefore ) {
		var startElement = selection.getStartElement(),
			cell = startElement.getAscendant( { td: 1, th: 1 }, true );

		if ( !cell )
			return;

		// Create the new cell element to be added.
		var newCell = cell.clone();
		newCell.appendBogus();

		if ( insertBefore )
			newCell.insertBefore( cell );
		else
			newCell.insertAfter( cell );
	}

	function deleteCells( selectionOrCell ) {
		if ( selectionOrCell instanceof CKEDITOR.dom.selection ) {
			var ranges = selectionOrCell.getRanges(),
				cellsToDelete = getSelectedCells( selectionOrCell ),
				table = cellsToDelete[ 0 ] && cellsToDelete[ 0 ].getAscendant( 'table' ),
				cellToFocus = getFocusElementAfterDelCells( cellsToDelete );

			selectionOrCell.reset();

			for ( var i = cellsToDelete.length - 1; i >= 0; i-- ) {
				deleteCells( cellsToDelete[ i ] );
			}

			if ( cellToFocus ) {
				placeCursorInCell( cellToFocus, true );
			} else if ( table ) {
				// After deleting whole table, the selection would be broken,
				// therefore it's safer to move it outside the table first.
				ranges[ 0 ].moveToPosition( table, CKEDITOR.POSITION_BEFORE_START );
				ranges[ 0 ].select();

				table.remove();
			}
		} else if ( selectionOrCell instanceof CKEDITOR.dom.element ) {
			var tr = selectionOrCell.getParent();
			if ( tr.getChildCount() == 1 ) {
				tr.remove();
			} else {
				selectionOrCell.remove();
			}
		}
	}

	// Remove filler at end and empty spaces around the cell content.
	function trimCell( cell ) {
		var bogus = cell.getBogus();
		bogus && bogus.remove();
		cell.trim();
	}

	function placeCursorInCell( cell, placeAtEnd ) {
		var docInner = cell.getDocument(),
			docOuter = CKEDITOR.document;

		// Fixing "Unspecified error" thrown in IE10 by resetting
		// selection the dirty and shameful way (https://dev.ckeditor.com/ticket/10308).
		// We can not apply this hack to IE8 because
		// it causes error (https://dev.ckeditor.com/ticket/11058).
		if ( CKEDITOR.env.ie && CKEDITOR.env.version == 10 ) {
			docOuter.focus();
			docInner.focus();
		}

		var range = new CKEDITOR.dom.range( docInner );
		if ( !range[ 'moveToElementEdit' + ( placeAtEnd ? 'End' : 'Start' ) ]( cell ) ) {
			range.selectNodeContents( cell );
			range.collapse( placeAtEnd ? false : true );
		}
		range.select( true );
	}

	function cellInRow( tableMap, rowIndex, cell ) {
		var oRow = tableMap[ rowIndex ];
		if ( typeof cell == 'undefined' )
			return oRow;

		for ( var c = 0; oRow && c < oRow.length; c++ ) {
			if ( cell.is && oRow[ c ] == cell.$ )
				return c;
			else if ( c == cell )
				return new CKEDITOR.dom.element( oRow[ c ] );
		}
		return cell.is ? -1 : null;
	}

	function cellInCol( tableMap, colIndex ) {
		var oCol = [];
		for ( var r = 0; r < tableMap.length; r++ ) {
			var row = tableMap[ r ];
			oCol.push( row[ colIndex ] );

			// Avoid adding duplicate cells.
			if ( row[ colIndex ].rowSpan > 1 )
				r += row[ colIndex ].rowSpan - 1;
		}
		return oCol;
	}

	function mergeCells( selection, mergeDirection, isDetect ) {
		var cells = getSelectedCells( selection );

		// Invalid merge request if:
		// 1. In batch mode despite that less than two selected.
		// 2. In solo mode while not exactly only one selected.
		// 3. Cells distributed in different table groups (e.g. from both thead and tbody).
		var commonAncestor;
		if ( ( mergeDirection ? cells.length != 1 : cells.length < 2 ) || ( commonAncestor = selection.getCommonAncestor() ) && commonAncestor.type == CKEDITOR.NODE_ELEMENT && commonAncestor.is( 'table' ) )
			return false;

		var cell,
			firstCell = cells[ 0 ],
			table = firstCell.getAscendant( 'table' ),
			map = CKEDITOR.tools.buildTableMap( table ),
			mapHeight = map.length,
			mapWidth = map[ 0 ].length,
			startRow = firstCell.getParent().$.rowIndex,
			startColumn = cellInRow( map, startRow, firstCell );

		if ( mergeDirection ) {
			var targetCell;
			try {
				var rowspan = parseInt( firstCell.getAttribute( 'rowspan' ), 10 ) || 1;
				var colspan = parseInt( firstCell.getAttribute( 'colspan' ), 10 ) || 1;

				targetCell = map[ mergeDirection == 'up' ? ( startRow - rowspan ) : mergeDirection == 'down' ? ( startRow + rowspan ) : startRow ][
					mergeDirection == 'left' ?
						( startColumn - colspan ) :
					mergeDirection == 'right' ? ( startColumn + colspan ) : startColumn ];

			} catch ( er ) {
				return false;
			}

			// 1. No cell could be merged.
			// 2. Same cell actually.
			if ( !targetCell || firstCell.$ == targetCell )
				return false;

			// Sort in map order regardless of the DOM sequence.
			cells[ ( mergeDirection == 'up' || mergeDirection == 'left' ) ? 'unshift' : 'push' ]( new CKEDITOR.dom.element( targetCell ) );
		}

		// Start from here are merging way ignorance (merge up/right, batch merge).
		var doc = firstCell.getDocument(),
			lastRowIndex = startRow,
			totalRowSpan = 0,
			totalColSpan = 0,
			// Use a documentFragment as buffer when appending cell contents.
			frag = !isDetect && new CKEDITOR.dom.documentFragment( doc ),
			dimension = 0;

		for ( var i = 0; i < cells.length; i++ ) {
			cell = cells[ i ];

			var tr = cell.getParent(),
				cellFirstChild = cell.getFirst(),
				colSpan = cell.$.colSpan,
				rowSpan = cell.$.rowSpan,
				rowIndex = tr.$.rowIndex,
				colIndex = cellInRow( map, rowIndex, cell );

			// Accumulated the actual places taken by all selected cells.
			dimension += colSpan * rowSpan;
			// Accumulated the maximum virtual spans from column and row.
			totalColSpan = Math.max( totalColSpan, colIndex - startColumn + colSpan );
			totalRowSpan = Math.max( totalRowSpan, rowIndex - startRow + rowSpan );

			if ( !isDetect ) {
				// Trim all cell fillers and check to remove empty cells.
				if ( trimCell( cell ), cell.getChildren().count() ) {
					// Merge vertically cells as two separated paragraphs.
					if ( rowIndex != lastRowIndex && cellFirstChild && !( cellFirstChild.isBlockBoundary && cellFirstChild.isBlockBoundary( { br: 1 } ) ) ) {
						var last = frag.getLast( CKEDITOR.dom.walker.whitespaces( true ) );
						if ( last && !( last.is && last.is( 'br' ) ) )
							frag.append( 'br' );
					}

					cell.moveChildren( frag );
				}
				i ? cell.remove() : cell.setHtml( '' );
			}
			lastRowIndex = rowIndex;
		}

		if ( !isDetect ) {
			frag.moveChildren( firstCell );

			firstCell.appendBogus();

			if ( totalColSpan >= mapWidth )
				firstCell.removeAttribute( 'rowSpan' );
			else
				firstCell.$.rowSpan = totalRowSpan;

			if ( totalRowSpan >= mapHeight )
				firstCell.removeAttribute( 'colSpan' );
			else
				firstCell.$.colSpan = totalColSpan;

			// Swip empty <tr> left at the end of table due to the merging.
			var trs = new CKEDITOR.dom.nodeList( table.$.rows ),
				count = trs.count();

			for ( i = count - 1; i >= 0; i-- ) {
				var tailTr = trs.getItem( i );
				if ( !tailTr.$.cells.length ) {
					tailTr.remove();
					count++;
					continue;
				}
			}

			return firstCell;
		}
		// Be able to merge cells only if actual dimension of selected
		// cells equals to the caculated rectangle.
		else {
			return ( totalRowSpan * totalColSpan ) == dimension;
		}
	}

	function horizontalSplitCell( selection, isDetect ) {
		var cells = getSelectedCells( selection );
		if ( cells.length > 1 )
			return false;
		else if ( isDetect )
			return true;

		var cell = cells[ 0 ],
			tr = cell.getParent(),
			table = tr.getAscendant( 'table' ),
			map = CKEDITOR.tools.buildTableMap( table ),
			rowIndex = tr.$.rowIndex,
			colIndex = cellInRow( map, rowIndex, cell ),
			rowSpan = cell.$.rowSpan,
			newCell, newRowSpan, newCellRowSpan, newRowIndex;

		if ( rowSpan > 1 ) {
			newRowSpan = Math.ceil( rowSpan / 2 );
			newCellRowSpan = Math.floor( rowSpan / 2 );
			newRowIndex = rowIndex + newRowSpan;
			var newCellTr = new CKEDITOR.dom.element( table.$.rows[ newRowIndex ] ),
				newCellRow = cellInRow( map, newRowIndex ),
				candidateCell;

			newCell = cell.clone();

			// Figure out where to insert the new cell by checking the vitual row.
			for ( var c = 0; c < newCellRow.length; c++ ) {
				candidateCell = newCellRow[ c ];
				// Catch first cell actually following the column.
				if ( candidateCell.parentNode == newCellTr.$ && c > colIndex ) {
					newCell.insertBefore( new CKEDITOR.dom.element( candidateCell ) );
					break;
				} else {
					candidateCell = null;
				}
			}

			// The destination row is empty, append at will.
			if ( !candidateCell )
				newCellTr.append( newCell );
		} else {
			newCellRowSpan = newRowSpan = 1;

			newCellTr = tr.clone();
			newCellTr.insertAfter( tr );
			newCellTr.append( newCell = cell.clone() );

			var cellsInSameRow = cellInRow( map, rowIndex );
			for ( var i = 0; i < cellsInSameRow.length; i++ )
				cellsInSameRow[ i ].rowSpan++;
		}

		newCell.appendBogus();

		cell.$.rowSpan = newRowSpan;
		newCell.$.rowSpan = newCellRowSpan;
		if ( newRowSpan == 1 )
			cell.removeAttribute( 'rowSpan' );
		if ( newCellRowSpan == 1 )
			newCell.removeAttribute( 'rowSpan' );

		return newCell;
	}

	function verticalSplitCell( selection, isDetect ) {
		var cells = getSelectedCells( selection );
		if ( cells.length > 1 )
			return false;
		else if ( isDetect )
			return true;

		var cell = cells[ 0 ],
			tr = cell.getParent(),
			table = tr.getAscendant( 'table' ),
			map = CKEDITOR.tools.buildTableMap( table ),
			rowIndex = tr.$.rowIndex,
			colIndex = cellInRow( map, rowIndex, cell ),
			colSpan = cell.$.colSpan,
			newCell, newColSpan, newCellColSpan;

		if ( colSpan > 1 ) {
			newColSpan = Math.ceil( colSpan / 2 );
			newCellColSpan = Math.floor( colSpan / 2 );
		} else {
			newCellColSpan = newColSpan = 1;
			var cellsInSameCol = cellInCol( map, colIndex );
			for ( var i = 0; i < cellsInSameCol.length; i++ )
				cellsInSameCol[ i ].colSpan++;
		}
		newCell = cell.clone();
		newCell.insertAfter( cell );
		newCell.appendBogus();

		cell.$.colSpan = newColSpan;
		newCell.$.colSpan = newCellColSpan;
		if ( newColSpan == 1 )
			cell.removeAttribute( 'colSpan' );
		if ( newCellColSpan == 1 )
			newCell.removeAttribute( 'colSpan' );

		return newCell;
	}

	CKEDITOR.plugins.tabletools = {
		requires: 'table,dialog,contextmenu',

		init: function( editor ) {
			var lang = editor.lang.table,
				styleParse = CKEDITOR.tools.style.parse,
				requiredContent = [
					'td{width}', 'td{height}', 'td{border-color}', 'td{background-color}', 'td{white-space}', 'td{vertical-align}', 'td{text-align}',
					'td[colspan]', 'td[rowspan]', 'th' ];

			function createDef( def ) {
				return CKEDITOR.tools.extend( def || {}, {
					contextSensitive: 1,
					refresh: function( editor, path ) {
						this.setState( path.contains( { td: 1, th: 1 }, 1 ) ? CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED );
					}
				} );
			}
			function addCmd( name, def ) {
				var cmd = editor.addCommand( name, def );
				editor.addFeature( cmd );
			}

			addCmd( 'cellProperties', new CKEDITOR.dialogCommand( 'cellProperties', createDef( {
				allowedContent: 'td th{width,height,border-color,background-color,white-space,vertical-align,text-align}[colspan,rowspan]',
				requiredContent: requiredContent,
				contentTransformations: [ [ {
						element: 'td',
						left: function( element ) {
							return element.styles.background && styleParse.background( element.styles.background ).color;
						},
						right: function( element ) {
							element.styles[ 'background-color' ] = styleParse.background( element.styles.background ).color;
						}
					}, {
						element: 'td',
						check: 'td{vertical-align}',
						left: function( element ) {
							return element.attributes && element.attributes.valign;
						},
						right: function( element ) {
							element.styles[ 'vertical-align' ] = element.attributes.valign;
							delete element.attributes.valign;
						}
					}
					], [
						{
							// (https://dev.ckeditor.com/ticket/16818)
							element: 'tr',
							check: 'td{height}',
							left: function( element ) {
								return element.styles && element.styles.height;
							},
							right: function( element ) {
								CKEDITOR.tools.array.forEach( element.children, function( node ) {
									if ( node.name in { td: 1, th: 1 } ) {
										node.attributes[ 'cke-row-height' ] = element.styles.height;
									}
								} );

								delete element.styles.height;
							}
						}
					], [
						{
							// (https://dev.ckeditor.com/ticket/16818)
							element: 'td',
							check: 'td{height}',
							left: function( element ) {
								var attributes = element.attributes;
								return attributes && attributes[ 'cke-row-height' ];
							},
							right: function( element ) {
								element.styles.height = element.attributes[ 'cke-row-height' ];
								delete element.attributes[ 'cke-row-height' ];
							}
						}
					] ]
			} ) ) );
			CKEDITOR.dialog.add( 'cellProperties', this.path + 'dialogs/tableCell.js' );

			addCmd( 'rowDelete', createDef( {
				requiredContent: 'table',
				exec: function( editor ) {
					var selection = editor.getSelection(),
						cursorPosition = deleteRows( selection );

					if ( cursorPosition ) {
						placeCursorInCell( cursorPosition );
					}
				}
			} ) );

			addCmd( 'rowInsertBefore', createDef( {
				requiredContent: 'table',
				exec: function( editor ) {
					var selection = editor.getSelection(),
						cells = getSelectedCells( selection );

					insertRow( cells, true );
				}
			} ) );

			addCmd( 'rowInsertAfter', createDef( {
				requiredContent: 'table',
				exec: function( editor ) {
					var selection = editor.getSelection(),
						cells = getSelectedCells( selection );

					insertRow( cells );
				}
			} ) );

			addCmd( 'columnDelete', createDef( {
				requiredContent: 'table',
				exec: function( editor ) {
					var selection = editor.getSelection();
					var element = deleteColumns( selection );

					if ( element ) {
						placeCursorInCell( element, true );
					}
				}
			} ) );

			addCmd( 'columnInsertBefore', createDef( {
				requiredContent: 'table',
				exec: function( editor ) {
					var selection = editor.getSelection(),
						cells = getSelectedCells( selection );

					insertColumn( cells, true );
				}
			} ) );

			addCmd( 'columnInsertAfter', createDef( {
				requiredContent: 'table',
				exec: function( editor ) {
					var selection = editor.getSelection(),
						cells = getSelectedCells( selection );

					insertColumn( cells );
				}
			} ) );

			addCmd( 'cellDelete', createDef( {
				requiredContent: 'table',
				exec: function( editor ) {
					var selection = editor.getSelection();

					deleteCells( selection );
				}
			} ) );

			addCmd( 'cellMerge', createDef( {
				allowedContent: 'td[colspan,rowspan]',
				requiredContent: 'td[colspan,rowspan]',
				exec: function( editor, data ) {
					data.cell = mergeCells( editor.getSelection() );

					placeCursorInCell( data.cell, true );
				}
			} ) );

			addCmd( 'cellMergeRight', createDef( {
				allowedContent: 'td[colspan]',
				requiredContent: 'td[colspan]',
				exec: function( editor, data ) {
					data.cell = mergeCells( editor.getSelection(), 'right' );

					placeCursorInCell( data.cell, true );
				}
			} ) );

			addCmd( 'cellMergeDown', createDef( {
				allowedContent: 'td[rowspan]',
				requiredContent: 'td[rowspan]',
				exec: function( editor, data ) {
					data.cell = mergeCells( editor.getSelection(), 'down' );

					placeCursorInCell( data.cell, true );
				}
			} ) );

			addCmd( 'cellVerticalSplit', createDef( {
				allowedContent: 'td[rowspan]',
				requiredContent: 'td[rowspan]',
				exec: function( editor ) {
					placeCursorInCell( verticalSplitCell( editor.getSelection() ) );
				}
			} ) );

			addCmd( 'cellHorizontalSplit', createDef( {
				allowedContent: 'td[colspan]',
				requiredContent: 'td[colspan]',
				exec: function( editor ) {
					placeCursorInCell( horizontalSplitCell( editor.getSelection() ) );
				}
			} ) );

			addCmd( 'cellInsertBefore', createDef( {
				requiredContent: 'table',
				exec: function( editor ) {
					var selection = editor.getSelection();

					insertCell( selection, true );
				}
			} ) );

			addCmd( 'cellInsertAfter', createDef( {
				requiredContent: 'table',
				exec: function( editor ) {
					var selection = editor.getSelection();

					insertCell( selection );
				}
			} ) );

			// If the "menu" plugin is loaded, register the menu items.
			if ( editor.addMenuItems ) {
				editor.addMenuItems( {
					tablecell: {
						label: lang.cell.menu,
						group: 'tablecell',
						order: 1,
						getItems: function() {
							var selection = editor.getSelection(),
								cells = getSelectedCells( selection ),
								items = {
									tablecell_insertBefore: CKEDITOR.TRISTATE_OFF,
									tablecell_insertAfter: CKEDITOR.TRISTATE_OFF,
									tablecell_delete: CKEDITOR.TRISTATE_OFF,
									tablecell_merge: mergeCells( selection, null, true ) ? CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED,
									tablecell_merge_right: mergeCells( selection, 'right', true ) ? CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED,
									tablecell_merge_down: mergeCells( selection, 'down', true ) ? CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED,
									tablecell_split_vertical: verticalSplitCell( selection, true ) ? CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED,
									tablecell_split_horizontal: horizontalSplitCell( selection, true ) ? CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED
								};

							if ( editor.filter.check( requiredContent ) ) {
								items.tablecell_properties = cells.length > 0 ? CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED;
							}

							return items;
						}
					},

					tablecell_insertBefore: {
						label: lang.cell.insertBefore,
						group: 'tablecell',
						command: 'cellInsertBefore',
						order: 5
					},

					tablecell_insertAfter: {
						label: lang.cell.insertAfter,
						group: 'tablecell',
						command: 'cellInsertAfter',
						order: 10
					},

					tablecell_delete: {
						label: lang.cell.deleteCell,
						group: 'tablecell',
						command: 'cellDelete',
						order: 15
					},

					tablecell_merge: {
						label: lang.cell.merge,
						group: 'tablecell',
						command: 'cellMerge',
						order: 16
					},

					tablecell_merge_right: {
						label: lang.cell.mergeRight,
						group: 'tablecell',
						command: 'cellMergeRight',
						order: 17
					},

					tablecell_merge_down: {
						label: lang.cell.mergeDown,
						group: 'tablecell',
						command: 'cellMergeDown',
						order: 18
					},

					tablecell_split_horizontal: {
						label: lang.cell.splitHorizontal,
						group: 'tablecell',
						command: 'cellHorizontalSplit',
						order: 19
					},

					tablecell_split_vertical: {
						label: lang.cell.splitVertical,
						group: 'tablecell',
						command: 'cellVerticalSplit',
						order: 20
					},

					tablecell_properties: {
						label: lang.cell.title,
						group: 'tablecellproperties',
						command: 'cellProperties',
						order: 21
					},

					tablerow: {
						label: lang.row.menu,
						group: 'tablerow',
						order: 1,
						getItems: function() {
							return {
								tablerow_insertBefore: CKEDITOR.TRISTATE_OFF,
								tablerow_insertAfter: CKEDITOR.TRISTATE_OFF,
								tablerow_delete: CKEDITOR.TRISTATE_OFF
							};
						}
					},

					tablerow_insertBefore: {
						label: lang.row.insertBefore,
						group: 'tablerow',
						command: 'rowInsertBefore',
						order: 5
					},

					tablerow_insertAfter: {
						label: lang.row.insertAfter,
						group: 'tablerow',
						command: 'rowInsertAfter',
						order: 10
					},

					tablerow_delete: {
						label: lang.row.deleteRow,
						group: 'tablerow',
						command: 'rowDelete',
						order: 15
					},

					tablecolumn: {
						label: lang.column.menu,
						group: 'tablecolumn',
						order: 1,
						getItems: function() {
							return {
								tablecolumn_insertBefore: CKEDITOR.TRISTATE_OFF,
								tablecolumn_insertAfter: CKEDITOR.TRISTATE_OFF,
								tablecolumn_delete: CKEDITOR.TRISTATE_OFF
							};
						}
					},

					tablecolumn_insertBefore: {
						label: lang.column.insertBefore,
						group: 'tablecolumn',
						command: 'columnInsertBefore',
						order: 5
					},

					tablecolumn_insertAfter: {
						label: lang.column.insertAfter,
						group: 'tablecolumn',
						command: 'columnInsertAfter',
						order: 10
					},

					tablecolumn_delete: {
						label: lang.column.deleteColumn,
						group: 'tablecolumn',
						command: 'columnDelete',
						order: 15
					}
				} );
			}

			// If the "contextmenu" plugin is laoded, register the listeners.
			if ( editor.contextMenu ) {
				editor.contextMenu.addListener( function( element, selection, path ) {
					var cell = path.contains( { 'td': 1, 'th': 1 }, 1 );
					if ( cell && !cell.isReadOnly() ) {
						return {
							tablecell: CKEDITOR.TRISTATE_OFF,
							tablerow: CKEDITOR.TRISTATE_OFF,
							tablecolumn: CKEDITOR.TRISTATE_OFF
						};
					}

					return null;
				} );
			}
		},

		// These methods are needed by tableselection plugin, so we must expose them.
		getCellColIndex: getCellColIndex,
		insertRow: insertRow,
		insertColumn: insertColumn,

		getSelectedCells: getSelectedCells
	};
	CKEDITOR.plugins.add( 'tabletools', CKEDITOR.plugins.tabletools );
} )();

/**
 * Creates a two-dimension array that reflects the actual layout of table cells,
 * with cell spans, with mappings to the original `td` elements.
 *
 * It could also create a map for the specified fragment of the table.
 *
 * @param {CKEDITOR.dom.element} table
 * @param {Number} startRow Row index from which the map should be created.
 * @param {Number} startCell Cell index from which the map should be created.
 * @param {Number} endRow Row index to which the map should be created.
 * @param {Number} endCell Cell index to which the map should be created.
 * @member CKEDITOR.tools
 */
CKEDITOR.tools.buildTableMap = function( table, startRow, startCell, endRow, endCell ) {
	var aRows = table.$.rows;

	startRow = startRow || 0;
	startCell = startCell || 0;
	endRow = typeof endRow === 'number' ? endRow : aRows.length - 1;
	endCell = typeof endCell === 'number' ? endCell : -1;

	// Row and Column counters.
	var r = -1;

	var aMap = [];

	for ( var i = startRow; i <= endRow; i++ ) {
		r++;
		!aMap[ r ] && ( aMap[ r ] = [] );

		var c = -1;

		for ( var j = startCell; j <= ( endCell === -1 ? ( aRows[ i ].cells.length - 1 ) : endCell ); j++ ) {
			var oCell = aRows[ i ].cells[ j ];

			if ( !oCell ) {
				break;
			}

			c++;
			while ( aMap[ r ][ c ] )
				c++;

			var iColSpan = isNaN( oCell.colSpan ) ? 1 : oCell.colSpan;
			var iRowSpan = isNaN( oCell.rowSpan ) ? 1 : oCell.rowSpan;

			for ( var rs = 0; rs < iRowSpan; rs++ ) {
				if ( i + rs > endRow ) {
					break;
				}

				if ( !aMap[ r + rs ] )
					aMap[ r + rs ] = [];

				for ( var cs = 0; cs < iColSpan; cs++ ) {
					aMap[ r + rs ][ c + cs ] = aRows[ i ].cells[ j ];
				}
			}

			c += iColSpan - 1;

			if ( endCell !== -1 && c >= endCell ) {
				break;
			}
		}
	}
	return aMap;
};

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

( function() {
	CKEDITOR.plugins.add( 'templates', {
		requires: 'dialog',
		// jscs:disable maximumLineLength
		// jscs:enable maximumLineLength
		init: function( editor ) {
			CKEDITOR.dialog.add( 'templates', CKEDITOR.getUrl( this.path + 'dialogs/templates.js' ) );

			editor.addCommand( 'templates', new CKEDITOR.dialogCommand( 'templates' ) );

			editor.ui.addButton && editor.ui.addButton( 'Templates', {
				label: editor.lang.templates.button,
				command: 'templates',
				toolbar: 'doctools,10'
			} );
		}
	} );

	var templates = {},
		loadedTemplatesFiles = {};

	CKEDITOR.addTemplates = function( name, definition ) {
		templates[ name ] = definition;
	};

	CKEDITOR.getTemplates = function( name ) {
		return templates[ name ];
	};

	CKEDITOR.loadTemplates = function( templateFiles, callback ) {
		// Holds the templates files to be loaded.
		var toLoad = [];

		// Look for pending template files to get loaded.
		for ( var i = 0, count = templateFiles.length; i < count; i++ ) {
			if ( !loadedTemplatesFiles[ templateFiles[ i ] ] ) {
				toLoad.push( templateFiles[ i ] );
				loadedTemplatesFiles[ templateFiles[ i ] ] = 1;
			}
		}

		if ( toLoad.length )
			CKEDITOR.scriptLoader.load( toLoad, callback );
		else
			setTimeout( callback, 0 );
	};
} )();



/**
 * The templates definition set to use. It accepts a list of names separated by
 * comma. It must match definitions loaded with the {@link #templates_files} setting.
 *
 *		config.templates = 'my_templates';
 *
 * @cfg {String} [templates='default']
 * @member CKEDITOR.config
 */

/**
 * The list of templates definition files to load.
 *
 *		config.templates_files = [
 *			'/editor_templates/site_default.js',
 *			'http://www.example.com/user_templates.js'
 *		];
 *
 * For a sample template file
 * [see `templates/default.js`](https://github.com/ckeditor/ckeditor-dev/blob/master/plugins/templates/templates/default.js).
 *
 * @cfg {String[]}
 * @member CKEDITOR.config
 */
CKEDITOR.config.templates_files = [
	CKEDITOR.getUrl( 'plugins/templates/templates/default.js' )
];

/**
 * Whether the "Replace actual contents" checkbox is checked by default in the
 * Templates dialog.
 *
 *		config.templates_replaceContent = false;
 *
 * @cfg {Boolean}
 * @member CKEDITOR.config
 */
CKEDITOR.config.templates_replaceContent = true;

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview Undo/Redo system for saving a snapshot for document modification
 *		and other recordable changes.
 */

'use strict';

( function() {
	var keystrokes = [
			CKEDITOR.CTRL + 90 /*Z*/,
			CKEDITOR.CTRL + 89 /*Y*/,
			CKEDITOR.CTRL + CKEDITOR.SHIFT + 90 /*Z*/
		],
		backspaceOrDelete = { 8: 1, 46: 1 };

	CKEDITOR.plugins.add( 'undo', {
		// jscs:disable maximumLineLength
		// jscs:enable maximumLineLength
		init: function( editor ) {
			var undoManager = editor.undoManager = new UndoManager( editor ),
				editingHandler = undoManager.editingHandler = new NativeEditingHandler( undoManager );

			var undoCommand = editor.addCommand( 'undo', {
				exec: function() {
					if ( undoManager.undo() ) {
						editor.selectionChange();
						this.fire( 'afterUndo' );
					}
				},
				startDisabled: true,
				canUndo: false
			} );

			var redoCommand = editor.addCommand( 'redo', {
				exec: function() {
					if ( undoManager.redo() ) {
						editor.selectionChange();
						this.fire( 'afterRedo' );
					}
				},
				startDisabled: true,
				canUndo: false
			} );

			editor.setKeystroke( [
				[ keystrokes[ 0 ], 'undo' ],
				[ keystrokes[ 1 ], 'redo' ],
				[ keystrokes[ 2 ], 'redo' ]
			] );

			undoManager.onChange = function() {
				undoCommand.setState( undoManager.undoable() ? CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED );
				redoCommand.setState( undoManager.redoable() ? CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED );
			};

			function recordCommand( event ) {
				// If the command hasn't been marked to not support undo.
				if ( undoManager.enabled && event.data.command.canUndo !== false )
					undoManager.save();
			}

			// We'll save snapshots before and after executing a command.
			editor.on( 'beforeCommandExec', recordCommand );
			editor.on( 'afterCommandExec', recordCommand );

			// Save snapshots before doing custom changes.
			editor.on( 'saveSnapshot', function( evt ) {
				undoManager.save( evt.data && evt.data.contentOnly );
			} );

			// Event manager listeners should be attached on contentDom.
			editor.on( 'contentDom', editingHandler.attachListeners, editingHandler );

			editor.on( 'instanceReady', function() {
				// Saves initial snapshot.
				editor.fire( 'saveSnapshot' );
			} );

			// Always save an undo snapshot - the previous mode might have
			// changed editor contents.
			editor.on( 'beforeModeUnload', function() {
				editor.mode == 'wysiwyg' && undoManager.save( true );
			} );

			function toggleUndoManager() {
				undoManager.enabled = editor.readOnly ? false : editor.mode == 'wysiwyg';
				undoManager.onChange();
			}

			// Make the undo manager available only in wysiwyg mode.
			editor.on( 'mode', toggleUndoManager );

			// Disable undo manager when in read-only mode.
			editor.on( 'readOnly', toggleUndoManager );

			if ( editor.ui.addButton ) {
				editor.ui.addButton( 'Undo', {
					label: editor.lang.undo.undo,
					command: 'undo',
					toolbar: 'undo,10'
				} );

				editor.ui.addButton( 'Redo', {
					label: editor.lang.undo.redo,
					command: 'redo',
					toolbar: 'undo,20'
				} );
			}

			/**
			 * Resets the undo stack.
			 *
			 * @member CKEDITOR.editor
			 */
			editor.resetUndo = function() {
				// Reset the undo stack.
				undoManager.reset();

				// Create the first image.
				editor.fire( 'saveSnapshot' );
			};

			/**
			 * Amends the top of the undo stack (last undo image) with the current DOM changes.
			 *
			 *		function() {
			 *			editor.fire( 'saveSnapshot' );
			 *			editor.document.body.append(...);
			 *			// Makes new changes following the last undo snapshot a part of it.
			 *			editor.fire( 'updateSnapshot' );
			 *			..
			 *		}
			 *
			 * @event updateSnapshot
			 * @member CKEDITOR.editor
			 * @param {CKEDITOR.editor} editor This editor instance.
			 */
			editor.on( 'updateSnapshot', function() {
				if ( undoManager.currentImage )
					undoManager.update();
			} );

			/**
			 * Locks the undo manager to prevent any save/update operations.
			 *
			 * It is convenient to lock the undo manager before performing DOM operations
			 * that should not be recorded (e.g. auto paragraphing).
			 *
			 * See {@link CKEDITOR.plugins.undo.UndoManager#lock} for more details.
			 *
			 * **Note:** In order to unlock the undo manager, {@link #unlockSnapshot} has to be fired
			 * the same number of times that `lockSnapshot` has been fired.
			 *
			 * @since 4.0.0
			 * @event lockSnapshot
			 * @member CKEDITOR.editor
			 * @param {CKEDITOR.editor} editor This editor instance.
			 * @param data
			 * @param {Boolean} [data.dontUpdate] When set to `true`, the last snapshot will not be updated
			 * with the current content and selection. Read more in the {@link CKEDITOR.plugins.undo.UndoManager#lock} method.
			 * @param {Boolean} [data.forceUpdate] When set to `true`, the last snapshot will always be updated
			 * with the current content and selection. Read more in the {@link CKEDITOR.plugins.undo.UndoManager#lock} method.
			 */
			editor.on( 'lockSnapshot', function( evt ) {
				var data = evt.data;
				undoManager.lock( data && data.dontUpdate, data && data.forceUpdate );
			} );

			/**
			 * Unlocks the undo manager and updates the latest snapshot.
			 *
			 * @since 4.0.0
			 * @event unlockSnapshot
			 * @member CKEDITOR.editor
			 * @param {CKEDITOR.editor} editor This editor instance.
			 */
			editor.on( 'unlockSnapshot', undoManager.unlock, undoManager );
		}
	} );

	CKEDITOR.plugins.undo = {};

	/**
	 * Main logic for the Redo/Undo feature.
	 *
	 * @private
	 * @class CKEDITOR.plugins.undo.UndoManager
	 * @constructor Creates an UndoManager class instance.
	 * @param {CKEDITOR.editor} editor
	 */
	var UndoManager = CKEDITOR.plugins.undo.UndoManager = function( editor ) {
		/**
		 * An array storing the number of key presses, count in a row. Use {@link #keyGroups} members as index.
		 *
		 * **Note:** The keystroke count will be reset after reaching the limit of characters per snapshot.
		 *
		 * @since 4.4.4
		 */
		this.strokesRecorded = [ 0, 0 ];

		/**
		 * When the `locked` property is not `null`, the undo manager is locked, so
		 * operations like `save` or `update` are forbidden.
		 *
		 * The manager can be locked and unlocked by the {@link #lock} and {@link #unlock}
		 * methods, respectively.
		 *
		 * @readonly
		 * @property {Object} [locked=null]
		 */
		this.locked = null;

		/**
		 * Contains the previously processed key group, based on {@link #keyGroups}.
		 * `-1` means an unknown group.
		 *
		 * @since 4.4.4
		 * @readonly
		 * @property {Number} [previousKeyGroup=-1]
		 */
		this.previousKeyGroup = -1;

		/**
		 * The maximum number of snapshots in the stack. Configurable via {@link CKEDITOR.config#undoStackSize}.
		 *
		 * @readonly
		 * @property {Number} [limit]
		 */
		this.limit = editor.config.undoStackSize || 20;

		/**
		 * The maximum number of characters typed/deleted in one undo step.
		 *
		 * @since 4.4.5
		 * @readonly
		 */
		this.strokesLimit = 25;

		this.editor = editor;

		// Reset the undo stack.
		this.reset();
	};

	UndoManager.prototype = {
		/**
		 * Handles keystroke support for the undo manager. It is called on `keyup` event for
		 * keystrokes that can change the editor content.
		 *
		 * @param {Number} keyCode The key code.
		 * @param {Boolean} [strokesPerSnapshotExceeded] When set to `true`, the method will
		 * behave as if the strokes limit was exceeded regardless of the {@link #strokesRecorded} value.
		 */
		type: function( keyCode, strokesPerSnapshotExceeded ) {
			var keyGroup = UndoManager.getKeyGroup( keyCode ),
				// Count of keystrokes in current a row.
				// Note if strokesPerSnapshotExceeded will be exceeded, it'll be restarted.
				strokesRecorded = this.strokesRecorded[ keyGroup ] + 1;

			strokesPerSnapshotExceeded =
				( strokesPerSnapshotExceeded || strokesRecorded >= this.strokesLimit );

			if ( !this.typing )
				onTypingStart( this );

			if ( strokesPerSnapshotExceeded ) {
				// Reset the count of strokes, so it'll be later assigned to this.strokesRecorded.
				strokesRecorded = 0;

				this.editor.fire( 'saveSnapshot' );
			} else {
				// Fire change event.
				this.editor.fire( 'change' );
			}

			// Store recorded strokes count.
			this.strokesRecorded[ keyGroup ] = strokesRecorded;
			// This prop will tell in next iteration what kind of group was processed previously.
			this.previousKeyGroup = keyGroup;
		},

		/**
		 * Whether the new `keyCode` belongs to a different group than the previous one ({@link #previousKeyGroup}).
		 *
		 * @since 4.4.5
		 * @param {Number} keyCode
		 * @returns {Boolean}
		 */
		keyGroupChanged: function( keyCode ) {
			return UndoManager.getKeyGroup( keyCode ) != this.previousKeyGroup;
		},

		/**
		 * Resets the undo stack.
		 */
		reset: function() {
			// Stack for all the undo and redo snapshots, they're always created/removed
			// in consistency.
			this.snapshots = [];

			// Current snapshot history index.
			this.index = -1;

			this.currentImage = null;

			this.hasUndo = false;
			this.hasRedo = false;
			this.locked = null;

			this.resetType();
		},

		/**
		 * Resets all typing variables.
		 *
		 * @see #type
		 */
		resetType: function() {
			this.strokesRecorded = [ 0, 0 ];
			this.typing = false;
			this.previousKeyGroup = -1;
		},

		/**
		 * Refreshes the state of the {@link CKEDITOR.plugins.undo.UndoManager undo manager}
		 * as well as the state of the `undo` and `redo` commands.
		 */
		refreshState: function() {
			// These lines can be handled within onChange() too.
			this.hasUndo = !!this.getNextImage( true );
			this.hasRedo = !!this.getNextImage( false );
			// Reset typing
			this.resetType();
			this.onChange();
		},

		/**
		 * Saves a snapshot of the document image for later retrieval.
		 *
		 * @param {Boolean} onContentOnly If set to `true`, the snapshot will be saved only if the content has changed.
		 * @param {CKEDITOR.plugins.undo.Image} image An optional image to save. If skipped, current editor will be used.
		 * @param {Boolean} [autoFireChange=true] If set to `false`, will not trigger the {@link CKEDITOR.editor#change} event to editor.
		 */
		save: function( onContentOnly, image, autoFireChange ) {
			var editor = this.editor;
			// Do not change snapshots stack when locked, editor is not ready,
			// editable is not ready or when editor is in mode difference than 'wysiwyg'.
			if ( this.locked || editor.status != 'ready' || editor.mode != 'wysiwyg' )
				return false;

			var editable = editor.editable();
			if ( !editable || editable.status != 'ready' )
				return false;

			var snapshots = this.snapshots;

			// Get a content image.
			if ( !image )
				image = new Image( editor );

			// Do nothing if it was not possible to retrieve an image.
			if ( image.contents === false )
				return false;

			// Check if this is a duplicate. In such case, do nothing.
			if ( this.currentImage ) {
				if ( image.equalsContent( this.currentImage ) ) {
					if ( onContentOnly )
						return false;

					if ( image.equalsSelection( this.currentImage ) )
						return false;
				} else if ( autoFireChange !== false ) {
					editor.fire( 'change' );
				}
			}

			// Drop future snapshots.
			snapshots.splice( this.index + 1, snapshots.length - this.index - 1 );

			// If we have reached the limit, remove the oldest one.
			if ( snapshots.length == this.limit )
				snapshots.shift();

			// Add the new image, updating the current index.
			this.index = snapshots.push( image ) - 1;

			this.currentImage = image;

			if ( autoFireChange !== false )
				this.refreshState();
			return true;
		},

		/**
		 * Sets editor content/selection to the one stored in `image`.
		 *
		 * @param {CKEDITOR.plugins.undo.Image} image
		 */
		restoreImage: function( image ) {
			// Bring editor focused to restore selection.
			var editor = this.editor,
				sel;

			if ( image.bookmarks ) {
				editor.focus();
				// Retrieve the selection beforehand. (https://dev.ckeditor.com/ticket/8324)
				sel = editor.getSelection();
			}

			// Start transaction - do not allow any mutations to the
			// snapshots stack done when selecting bookmarks (much probably
			// by selectionChange listener).
			this.locked = { level: 999 };

			this.editor.loadSnapshot( image.contents );

			if ( image.bookmarks )
				sel.selectBookmarks( image.bookmarks );
			else if ( CKEDITOR.env.ie ) {
				// IE BUG: If I don't set the selection to *somewhere* after setting
				// document contents, then IE would create an empty paragraph at the bottom
				// the next time the document is modified.
				var $range = this.editor.document.getBody().$.createTextRange();
				$range.collapse( true );
				$range.select();
			}

			this.locked = null;

			this.index = image.index;
			this.currentImage = this.snapshots[ this.index ];

			// Update current image with the actual editor
			// content, since actually content may differ from
			// the original snapshot due to dom change. (https://dev.ckeditor.com/ticket/4622)
			this.update();
			this.refreshState();

			editor.fire( 'change' );
		},

		/**
		 * Gets the closest available image.
		 *
		 * @param {Boolean} isUndo If `true`, it will return the previous image.
		 * @returns {CKEDITOR.plugins.undo.Image} Next image or `null`.
		 */
		getNextImage: function( isUndo ) {
			var snapshots = this.snapshots,
				currentImage = this.currentImage,
				image, i;

			if ( currentImage ) {
				if ( isUndo ) {
					for ( i = this.index - 1; i >= 0; i-- ) {
						image = snapshots[ i ];
						if ( !currentImage.equalsContent( image ) ) {
							image.index = i;
							return image;
						}
					}
				} else {
					for ( i = this.index + 1; i < snapshots.length; i++ ) {
						image = snapshots[ i ];
						if ( !currentImage.equalsContent( image ) ) {
							image.index = i;
							return image;
						}
					}
				}
			}

			return null;
		},

		/**
		 * Checks the current redo state.
		 *
		 * @returns {Boolean} Whether the document has a previous state to retrieve.
		 */
		redoable: function() {
			return this.enabled && this.hasRedo;
		},

		/**
		 * Checks the current undo state.
		 *
		 * @returns {Boolean} Whether the document has a future state to restore.
		 */
		undoable: function() {
			return this.enabled && this.hasUndo;
		},

		/**
		 * Performs an undo operation on current index.
		 */
		undo: function() {
			if ( this.undoable() ) {
				this.save( true );

				var image = this.getNextImage( true );
				if ( image )
					return this.restoreImage( image ), true;
			}

			return false;
		},

		/**
		 * Performs a redo operation on current index.
		 */
		redo: function() {
			if ( this.redoable() ) {
				// Try to save. If no changes have been made, the redo stack
				// will not change, so it will still be redoable.
				this.save( true );

				// If instead we had changes, we can't redo anymore.
				if ( this.redoable() ) {
					var image = this.getNextImage( false );
					if ( image )
						return this.restoreImage( image ), true;
				}
			}

			return false;
		},

		/**
		 * Updates the last snapshot of the undo stack with the current editor content.
		 *
		 * @param {CKEDITOR.plugins.undo.Image} [newImage] The image which will replace the current one.
		 * If it is not set, it defaults to the image taken from the editor.
		 */
		update: function( newImage ) {
			// Do not change snapshots stack is locked.
			if ( this.locked )
				return;

			if ( !newImage )
				newImage = new Image( this.editor );

			var i = this.index,
				snapshots = this.snapshots;

			// Find all previous snapshots made for the same content (which differ
			// only by selection) and replace all of them with the current image.
			while ( i > 0 && this.currentImage.equalsContent( snapshots[ i - 1 ] ) )
				i -= 1;

			snapshots.splice( i, this.index - i + 1, newImage );
			this.index = i;
			this.currentImage = newImage;
		},

		/**
		 * Amends the last snapshot and changes its selection (only in case when content
		 * is equal between these two).
		 *
		 * @since 4.4.4
		 * @param {CKEDITOR.plugins.undo.Image} newSnapshot New snapshot with new selection.
		 * @returns {Boolean} Returns `true` if selection was amended.
		 */
		updateSelection: function( newSnapshot ) {
			if ( !this.snapshots.length )
				return false;

			var snapshots = this.snapshots,
				lastImage = snapshots[ snapshots.length - 1 ];

			if ( lastImage.equalsContent( newSnapshot ) ) {
				if ( !lastImage.equalsSelection( newSnapshot ) ) {
					snapshots[ snapshots.length - 1 ] = newSnapshot;
					this.currentImage = newSnapshot;
					return true;
				}
			}

			return false;
		},

		/**
		 * Locks the snapshot stack to prevent any save/update operations and when necessary,
		 * updates the tip of the snapshot stack with the DOM changes introduced during the
		 * locked period, after the {@link #unlock} method is called.
		 *
		 * It is mainly used to ensure any DOM operations that should not be recorded
		 * (e.g. auto paragraphing) are not added to the stack.
		 *
		 * **Note:** For every `lock` call you must call {@link #unlock} once to unlock the undo manager.
		 *
		 * @since 4.0.0
		 * @param {Boolean} [dontUpdate] When set to `true`, the last snapshot will not be updated
		 * with current content and selection. By default, if undo manager was up to date when the lock started,
		 * the last snapshot will be updated to the current state when unlocking. This means that all changes
		 * done during the lock will be merged into the previous snapshot or the next one. Use this option to gain
		 * more control over this behavior. For example, it is possible to group changes done during the lock into
		 * a separate snapshot.
		 * @param {Boolean} [forceUpdate] When set to `true`, the last snapshot will always be updated with the
		 * current content and selection regardless of the current state of the undo manager.
		 * When not set, the last snapshot will be updated only if the undo manager was up to date when locking.
		 * Additionally, this option makes it possible to lock the snapshot when the editor is not in the `wysiwyg` mode,
		 * because when it is passed, the snapshots will not need to be compared.
		 */
		lock: function( dontUpdate, forceUpdate ) {
			if ( !this.locked ) {
				if ( dontUpdate )
					this.locked = { level: 1 };
				else {
					var update = null;

					if ( forceUpdate )
						update = true;
					else {
						// Make a contents image. Don't include bookmarks, because:
						// * we don't compare them,
						// * there's a chance that DOM has been changed since
						// locked (e.g. fake) selection was made, so createBookmark2 could fail.
						// https://dev.ckeditor.com/ticket/11027#comment:3
						var imageBefore = new Image( this.editor, true );

						// If current editor content matches the tip of snapshot stack,
						// the stack tip must be updated by unlock, to include any changes made
						// during this period.
						if ( this.currentImage && this.currentImage.equalsContent( imageBefore ) )
							update = imageBefore;
					}

					this.locked = { update: update, level: 1 };
				}

			// Increase the level of lock.
			} else {
				this.locked.level++;
			}
		},

		/**
		 * Unlocks the snapshot stack and checks to amend the last snapshot.
		 *
		 * See {@link #lock} for more details.
		 *
		 * @since 4.0.0
		 */
		unlock: function() {
			if ( this.locked ) {
				// Decrease level of lock and check if equals 0, what means that undoM is completely unlocked.
				if ( !--this.locked.level ) {
					var update = this.locked.update;

					this.locked = null;

					// forceUpdate was passed to lock().
					if ( update === true )
						this.update();
					// update is instance of Image.
					else if ( update ) {
						var newImage = new Image( this.editor, true );

						if ( !update.equalsContent( newImage ) )
							this.update();
					}
				}
			}
		}
	};

	/**
	 * Codes for navigation keys like *Arrows*, *Page Up/Down*, etc.
	 * Used by the {@link #isNavigationKey} method.
	 *
	 * @since 4.4.5
	 * @readonly
	 * @static
	 */
	UndoManager.navigationKeyCodes = {
		37: 1, 38: 1, 39: 1, 40: 1, // Arrows.
		36: 1, 35: 1, // Home, End.
		33: 1, 34: 1 // PgUp, PgDn.
	};

	/**
	 * Key groups identifier mapping. Used for accessing members in
	 * {@link #strokesRecorded}.
	 *
	 * * `FUNCTIONAL` &ndash; identifier for the *Backspace* / *Delete* key.
	 * * `PRINTABLE` &ndash; identifier for printable keys.
	 *
	 * Example usage:
	 *
	 *		undoManager.strokesRecorded[ undoManager.keyGroups.FUNCTIONAL ];
	 *
	 * @since 4.4.5
	 * @readonly
	 * @static
	 */
	UndoManager.keyGroups = {
		PRINTABLE: 0,
		FUNCTIONAL: 1
	};

	/**
	 * Checks whether a key is one of navigation keys (*Arrows*, *Page Up/Down*, etc.).
	 * See also the {@link #navigationKeyCodes} property.
	 *
	 * @since 4.4.5
	 * @static
	 * @param {Number} keyCode
	 * @returns {Boolean}
	 */
	UndoManager.isNavigationKey = function( keyCode ) {
		return !!UndoManager.navigationKeyCodes[ keyCode ];
	};

	/**
	 * Returns the group to which the passed `keyCode` belongs.
	 *
	 * @since 4.4.5
	 * @static
	 * @param {Number} keyCode
	 * @returns {Number}
	 */
	UndoManager.getKeyGroup = function( keyCode ) {
		var keyGroups = UndoManager.keyGroups;

		return backspaceOrDelete[ keyCode ] ? keyGroups.FUNCTIONAL : keyGroups.PRINTABLE;
	};

	/**
	 * @since 4.4.5
	 * @static
	 * @param {Number} keyGroup
	 * @returns {Number}
	 */
	UndoManager.getOppositeKeyGroup = function( keyGroup ) {
		var keyGroups = UndoManager.keyGroups;
		return ( keyGroup == keyGroups.FUNCTIONAL ? keyGroups.PRINTABLE : keyGroups.FUNCTIONAL );
	};

	/**
	 * Whether we need to use a workaround for functional (*Backspace*, *Delete*) keys not firing
	 * the `keypress` event in Internet Explorer in this environment and for the specified `keyCode`.
	 *
	 * @since 4.4.5
	 * @static
	 * @param {Number} keyCode
	 * @returns {Boolean}
	 */
	UndoManager.ieFunctionalKeysBug = function( keyCode ) {
		return CKEDITOR.env.ie && UndoManager.getKeyGroup( keyCode ) == UndoManager.keyGroups.FUNCTIONAL;
	};

	// Helper method called when undoManager.typing val was changed to true.
	function onTypingStart( undoManager ) {
		// It's safe to now indicate typing state.
		undoManager.typing = true;

		// Manually mark snapshot as available.
		undoManager.hasUndo = true;
		undoManager.hasRedo = false;

		undoManager.onChange();
	}

	/**
	 * Contains a snapshot of the editor content and selection at a given point in time.
	 *
	 * @private
	 * @class CKEDITOR.plugins.undo.Image
	 * @constructor Creates an Image class instance.
	 * @param {CKEDITOR.editor} editor The editor instance on which the image is created.
	 * @param {Boolean} [contentsOnly] If set to `true`, the image will only contain content without the selection.
	 */
	var Image = CKEDITOR.plugins.undo.Image = function( editor, contentsOnly ) {
			this.editor = editor;

			editor.fire( 'beforeUndoImage' );

			var contents = editor.getSnapshot();

			// In IE, we need to remove the expando attributes.
			if ( CKEDITOR.env.ie && contents )
				contents = contents.replace( /\s+data-cke-expando=".*?"/g, '' );

			this.contents = contents;

			if ( !contentsOnly ) {
				var selection = contents && editor.getSelection();
				this.bookmarks = selection && selection.createBookmarks2( true );
			}

			editor.fire( 'afterUndoImage' );
		};

	// Attributes that browser may changing them when setting via innerHTML.
	var protectedAttrs = /\b(?:href|src|name)="[^"]*?"/gi;

	Image.prototype = {
		/**
		 * @param {CKEDITOR.plugins.undo.Image} otherImage Image to compare to.
		 * @returns {Boolean} Returns `true` if content in `otherImage` is the same.
		 */
		equalsContent: function( otherImage ) {
			var thisContents = this.contents,
				otherContents = otherImage.contents;

			// For IE7 and IE QM: Comparing only the protected attribute values but not the original ones.(https://dev.ckeditor.com/ticket/4522)
			if ( CKEDITOR.env.ie && ( CKEDITOR.env.ie7Compat || CKEDITOR.env.quirks ) ) {
				thisContents = thisContents.replace( protectedAttrs, '' );
				otherContents = otherContents.replace( protectedAttrs, '' );
			}

			if ( thisContents != otherContents )
				return false;

			return true;
		},

		/**
		 * @param {CKEDITOR.plugins.undo.Image} otherImage Image to compare to.
		 * @returns {Boolean} Returns `true` if selection in `otherImage` is the same.
		 */
		equalsSelection: function( otherImage ) {
			var bookmarksA = this.bookmarks,
				bookmarksB = otherImage.bookmarks;

			if ( bookmarksA || bookmarksB ) {
				if ( !bookmarksA || !bookmarksB || bookmarksA.length != bookmarksB.length )
					return false;

				for ( var i = 0; i < bookmarksA.length; i++ ) {
					var bookmarkA = bookmarksA[ i ],
						bookmarkB = bookmarksB[ i ];

					if ( bookmarkA.startOffset != bookmarkB.startOffset || bookmarkA.endOffset != bookmarkB.endOffset ||
						!CKEDITOR.tools.arrayCompare( bookmarkA.start, bookmarkB.start ) ||
						!CKEDITOR.tools.arrayCompare( bookmarkA.end, bookmarkB.end ) ) {
						return false;
					}
				}
			}

			return true;
		}

		/**
		 * Editor content.
		 *
		 * @readonly
		 * @property {String} contents
		 */

		/**
		 * Bookmarks representing the selection in an image.
		 *
		 * @readonly
		 * @property {Object[]} bookmarks Array of bookmark2 objects, see {@link CKEDITOR.dom.range#createBookmark2} for definition.
		 */
	};

	/**
	 * A class encapsulating all native event listeners which have to be used in
	 * order to handle undo manager integration for native editing actions (excluding drag and drop and paste support
	 * handled by the Clipboard plugin).
	 *
	 * @since 4.4.4
	 * @private
	 * @class CKEDITOR.plugins.undo.NativeEditingHandler
	 * @member CKEDITOR.plugins.undo Undo manager owning the handler.
	 * @constructor
	 * @param {CKEDITOR.plugins.undo.UndoManager} undoManager
	 */
	var NativeEditingHandler = CKEDITOR.plugins.undo.NativeEditingHandler = function( undoManager ) {
		// We'll use keyboard + input events to determine if snapshot should be created.
		// Since `input` event is fired before `keyup`. We can tell in `keyup` event if input occurred.
		// That will tell us if any printable data was inserted.
		// On `input` event we'll increase input fired counter for proper key code.
		// Eventually it might be canceled by paste/drop using `ignoreInputEvent` flag.
		// Order of events can be found in http://www.w3.org/TR/DOM-Level-3-Events/

		/**
		 * An undo manager instance owning the editing handler.
		 *
		 * @property {CKEDITOR.plugins.undo.UndoManager} undoManager
		 */
		this.undoManager = undoManager;

		/**
		 * See {@link #ignoreInputEventListener}.
		 *
		 * @since 4.4.5
		 * @private
		 */
		this.ignoreInputEvent = false;

		/**
		 * A stack of pressed keys.
		 *
		 * @since 4.4.5
		 * @property {CKEDITOR.plugins.undo.KeyEventsStack} keyEventsStack
		 */
		this.keyEventsStack = new KeyEventsStack();

		/**
		 * An image of the editor during the `keydown` event (therefore without DOM modification).
		 *
		 * @property {CKEDITOR.plugins.undo.Image} lastKeydownImage
		 */
		this.lastKeydownImage = null;
	};

	NativeEditingHandler.prototype = {
		/**
		 * The `keydown` event listener.
		 *
		 * @param {CKEDITOR.dom.event} evt
		 */
		onKeydown: function( evt ) {
			var keyCode = evt.data.getKey();

			// The composition is in progress - ignore the key. (https://dev.ckeditor.com/ticket/12597)
			if ( keyCode === 229 ) {
				return;
			}

			// Block undo/redo keystrokes when at the bottom/top of the undo stack (https://dev.ckeditor.com/ticket/11126 and https://dev.ckeditor.com/ticket/11677).
			if ( CKEDITOR.tools.indexOf( keystrokes, evt.data.getKeystroke() ) > -1 ) {
				evt.data.preventDefault();
				return;
			}

			// Cleaning tab functional keys.
			this.keyEventsStack.cleanUp( evt );

			var undoManager = this.undoManager;

			// Gets last record for provided keyCode. If not found will create one.
			var last = this.keyEventsStack.getLast( keyCode );
			if ( !last ) {
				this.keyEventsStack.push( keyCode );
			}

			// We need to store an image which will be used in case of key group
			// change.
			this.lastKeydownImage = new Image( undoManager.editor );

			if ( UndoManager.isNavigationKey( keyCode ) || this.undoManager.keyGroupChanged( keyCode ) ) {
				if ( undoManager.strokesRecorded[ 0 ] || undoManager.strokesRecorded[ 1 ] ) {
					// We already have image, so we'd like to reuse it.

					// https://dev.ckeditor.com/ticket/12300
					undoManager.save( false, this.lastKeydownImage, false );
					undoManager.resetType();
				}
			}
		},

		/**
		 * The `input` event listener.
		 */
		onInput: function() {
			// Input event is ignored if paste/drop event were fired before.
			if ( this.ignoreInputEvent ) {
				// Reset flag - ignore only once.
				this.ignoreInputEvent = false;
				return;
			}

			var lastInput = this.keyEventsStack.getLast();
			// Nothing in key events stack, but input event called. Interesting...
			// That's because on Android order of events is buggy and also keyCode is set to 0.
			if ( !lastInput ) {
				lastInput = this.keyEventsStack.push( 0 );
			}

			// Increment inputs counter for provided key code.
			this.keyEventsStack.increment( lastInput.keyCode );

			// Exceeded limit.
			if ( this.keyEventsStack.getTotalInputs() >= this.undoManager.strokesLimit ) {
				this.undoManager.type( lastInput.keyCode, true );
				this.keyEventsStack.resetInputs();
			}
		},

		/**
		 * The `keyup` event listener.
		 *
		 * @param {CKEDITOR.dom.event} evt
		 */
		onKeyup: function( evt ) {
			var undoManager = this.undoManager,
				keyCode = evt.data.getKey(),
				totalInputs = this.keyEventsStack.getTotalInputs();

			// Remove record from stack for provided key code.
			this.keyEventsStack.remove( keyCode );

			// Second part of the workaround for IEs functional keys bug. We need to check whether something has really
			// changed because we blindly mocked the keypress event.
			// Also we need to be aware that lastKeydownImage might not be available (https://dev.ckeditor.com/ticket/12327).
			if ( UndoManager.ieFunctionalKeysBug( keyCode ) && this.lastKeydownImage &&
				this.lastKeydownImage.equalsContent( new Image( undoManager.editor, true ) ) ) {
				return;
			}

			if ( totalInputs > 0 ) {
				undoManager.type( keyCode );
			} else if ( UndoManager.isNavigationKey( keyCode ) ) {
				// Note content snapshot has been checked in keydown.
				this.onNavigationKey( true );
			}
		},

		/**
		 * Method called for navigation change. At first it will check if current content does not differ
		 * from the last saved snapshot.
		 *
		 * * If the content is different, the method creates a standard, extra snapshot.
		 * * If the content is not different, the method will compare the selection, and will
		 * amend the last snapshot selection if it changed.
		 *
		 * @param {Boolean} skipContentCompare If set to `true`, it will not compare content, and only do a selection check.
		 */
		onNavigationKey: function( skipContentCompare ) {
			var undoManager = this.undoManager;

			// We attempt to save content snapshot, if content didn't change, we'll
			// only amend selection.
			if ( skipContentCompare || !undoManager.save( true, null, false ) )
				undoManager.updateSelection( new Image( undoManager.editor ) );

			undoManager.resetType();
		},

		/**
		 * Makes the next `input` event to be ignored.
		 */
		ignoreInputEventListener: function() {
			this.ignoreInputEvent = true;
		},

		/**
		 * Stops ignoring `input` events.
		 * @since 4.7.3
		 */
		activateInputEventListener: function() {
			this.ignoreInputEvent = false;
		},

		/**
		 * Attaches editable listeners required to provide the undo functionality.
		 */
		attachListeners: function() {
			var editor = this.undoManager.editor,
				editable = editor.editable(),
				that = this;

			// We'll create a snapshot here (before DOM modification), because we'll
			// need unmodified content when we got keygroup toggled in keyup.
			editable.attachListener( editable, 'keydown', function( evt ) {
				that.onKeydown( evt );

				// On IE keypress isn't fired for functional (backspace/delete) keys.
				// Let's pretend that something's changed.
				if ( UndoManager.ieFunctionalKeysBug( evt.data.getKey() ) ) {
					that.onInput();
				}
			}, null, null, 999 );

			// Only IE can't use input event, because it's not fired in contenteditable.
			editable.attachListener( editable, ( CKEDITOR.env.ie ? 'keypress' : 'input' ), that.onInput, that, null, 999 );

			// Keyup executes main snapshot logic.
			editable.attachListener( editable, 'keyup', that.onKeyup, that, null, 999 );

			// On paste and drop we need to ignore input event.
			// It would result with calling undoManager.type() on any following key.
			editable.attachListener( editable, 'paste', that.ignoreInputEventListener, that, null, 999 );
			editable.attachListener( editable, 'drop', that.ignoreInputEventListener, that, null, 999 );

			// After paste we need to re-enable input event listener (#554).
			editor.on( 'afterPaste', that.activateInputEventListener, that, null, 999 );

			// Click should create a snapshot if needed, but shouldn't cause change event.
			// Don't pass onNavigationKey directly as a listener because it accepts one argument which
			// will conflict with evt passed to listener.
			// https://dev.ckeditor.com/ticket/12324 comment:4
			editable.attachListener( editable.isInline() ? editable : editor.document.getDocumentElement(), 'click', function() {
				that.onNavigationKey();
			}, null, null, 999 );

			// When pressing `Tab` key while editable is focused, `keyup` event is not fired.
			// Which means that record for `tab` key stays in key events stack.
			// We assume that when editor is blurred `tab` key is already up.
			editable.attachListener( this.undoManager.editor, 'blur', function() {
				that.keyEventsStack.remove( 9 /*Tab*/ );
			}, null, null, 999 );
		}
	};

	/**
	 * This class represents a stack of pressed keys and stores information
	 * about how many `input` events each key press has caused.
	 *
	 * @since 4.4.5
	 * @private
	 * @class CKEDITOR.plugins.undo.KeyEventsStack
	 * @constructor
	 */
	var KeyEventsStack = CKEDITOR.plugins.undo.KeyEventsStack = function() {
		/**
		 * @readonly
		 */
		this.stack = [];
	};

	KeyEventsStack.prototype = {
		/**
		 * Pushes a literal object with two keys: `keyCode` and `inputs` (whose initial value is set to `0`) to stack.
		 * It is intended to be called on the `keydown` event.
		 *
		 * @param {Number} keyCode
		 */
		push: function( keyCode ) {
			var length = this.stack.push( { keyCode: keyCode, inputs: 0 } );
			return this.stack[ length - 1 ];
		},

		/**
		 * Returns the index of the last registered `keyCode` in the stack.
		 * If no `keyCode` is provided, then the function will return the index of the last item.
		 * If an item is not found, it will return `-1`.
		 *
		 * @param {Number} [keyCode]
		 * @returns {Number}
		 */
		getLastIndex: function( keyCode ) {
			if ( typeof keyCode != 'number' ) {
				return this.stack.length - 1; // Last index or -1.
			} else {
				var i = this.stack.length;
				while ( i-- ) {
					if ( this.stack[ i ].keyCode == keyCode ) {
						return i;
					}
				}
				return -1;
			}
		},

		/**
		 * Returns the last key recorded in the stack. If `keyCode` is provided, then it will return
		 * the  last record for this `keyCode`.
		 *
		 * @param {Number} [keyCode]
		 * @returns {Object} Last matching record or `null`.
		 */
		getLast: function( keyCode ) {
			var index = this.getLastIndex( keyCode );
			if ( index != -1 ) {
				return this.stack[ index ];
			} else {
				return null;
			}
		},

		/**
		 * Increments registered input events for stack record for a given `keyCode`.
		 *
		 * @param {Number} keyCode
		 */
		increment: function( keyCode ) {
			var found = this.getLast( keyCode );

			found.inputs++;
		},

		/**
		 * Removes the last record from the stack for the provided `keyCode`.
		 *
		 * @param {Number} keyCode
		 */
		remove: function( keyCode ) {
			var index = this.getLastIndex( keyCode );

			if ( index != -1 ) {
				this.stack.splice( index, 1 );
			}
		},

		/**
		 * Resets the `inputs` value to `0` for a given `keyCode` or in entire stack if a
		 * `keyCode` is not specified.
		 *
		 * @param {Number} [keyCode]
		 */
		resetInputs: function( keyCode ) {
			if ( typeof keyCode == 'number' ) {
				var last = this.getLast( keyCode );


				last.inputs = 0;
			} else {
				var i = this.stack.length;
				while ( i-- ) {
					this.stack[ i ].inputs = 0;
				}
			}
		},

		/**
		 * Sums up inputs number for each key code and returns it.
		 *
		 * @returns {Number}
		 */
		getTotalInputs: function() {
			var i = this.stack.length,
				total = 0;

			while ( i-- ) {
				total += this.stack[ i ].inputs;
			}
			return total;
		},

		/**
		 * Cleans the stack based on a provided `keydown` event object. The rationale behind this method
		 * is that some keystrokes cause the `keydown` event to be fired in the editor, but not the `keyup` event.
		 * For instance, *Alt+Tab* will fire `keydown`, but since the editor is blurred by it, then there is
		 * no `keyup`, so the keystroke is not removed from the stack.
		 *
		 * @param {CKEDITOR.dom.event} event
		 */
		cleanUp: function( event ) {
			var nativeEvent = event.data.$;

			if ( !( nativeEvent.ctrlKey || nativeEvent.metaKey ) ) {
				this.remove( 17 );
			}
			if ( !nativeEvent.shiftKey ) {
				this.remove( 16 );
			}
			if ( !nativeEvent.altKey ) {
				this.remove( 18 );
			}
		}
	};
} )();

/**
 * The number of undo steps to be saved. The higher value is set, the more
 * memory is used for it.
 *
 *		config.undoStackSize = 50;
 *
 * @cfg {Number} [undoStackSize=20]
 * @member CKEDITOR.config
 */

/**
 * Fired when the editor is about to save an undo snapshot. This event can be
 * fired by plugins and customizations to make the editor save undo snapshots.
 *
 * @event saveSnapshot
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor This editor instance.
 */

/**
 * Fired before an undo image is to be created. An *undo image* represents the
 * editor state at some point. It is saved into the undo store, so the editor is
 * able to recover the editor state on undo and redo operations.
 *
 * @since 3.5.3
 * @event beforeUndoImage
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor This editor instance.
 * @see CKEDITOR.editor#afterUndoImage
 */

/**
 * Fired after an undo image is created. An *undo image* represents the
 * editor state at some point. It is saved into the undo store, so the editor is
 * able to recover the editor state on undo and redo operations.
 *
 * @since 3.5.3
 * @event afterUndoImage
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor This editor instance.
 * @see CKEDITOR.editor#beforeUndoImage
 */

/**
 * Fired when the content of the editor is changed.
 *
 * Due to performance reasons, it is not verified if the content really changed.
 * The editor instead watches several editing actions that usually result in
 * changes. This event may thus in some cases be fired when no changes happen
 * or may even get fired twice.
 *
 * If it is important not to get the `change` event fired too often, you should compare the
 * previous and the current editor content inside the event listener. It is
 * not recommended to do that on every `change` event.
 *
 * Please note that the `change` event is only fired in the {@link #property-mode wysiwyg mode}.
 * In order to implement similar functionality in the source mode, you can listen for example to the {@link #key}
 * event or the native [`input`](https://developer.mozilla.org/en-US/docs/Web/Reference/Events/input)
 * event (not supported by Internet Explorer 8).
 *
 *		editor.on( 'mode', function() {
 *			if ( this.mode == 'source' ) {
 *				var editable = editor.editable();
 *				editable.attachListener( editable, 'input', function() {
 *					// Handle changes made in the source mode.
 *				} );
 *			}
 *		} );
 *
 * @since 4.2.0
 * @event change
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor This editor instance.
 */

/**
 * Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview The WYSIWYG Area plugin. It registers the "wysiwyg" editing
 *		mode, which handles the main editing area space.
 */

( function() {
	var framedWysiwyg;

	CKEDITOR.plugins.add( 'wysiwygarea', {
		init: function( editor ) {
			if ( editor.config.fullPage ) {
				editor.addFeature( {
					allowedContent: 'html head title; style [media,type]; body (*)[id]; meta link [*]',
					requiredContent: 'body'
				} );
			}

			editor.addMode( 'wysiwyg', function( callback ) {
				var src = 'document.open();' +
					// In IE, the document domain must be set any time we call document.open().
					( CKEDITOR.env.ie ? '(' + CKEDITOR.tools.fixDomain + ')();' : '' ) +
					'document.close();';

				// With IE, the custom domain has to be taken care at first,
				// for other browers, the 'src' attribute should be left empty to
				// trigger iframe's 'load' event.
				// Microsoft Edge throws "Permission Denied" if treated like an IE (https://dev.ckeditor.com/ticket/13441).
				if ( CKEDITOR.env.air ) {
					src = 'javascript:void(0)'; // jshint ignore:line
				} else if ( CKEDITOR.env.ie && !CKEDITOR.env.edge ) {
					src = 'javascript:void(function(){' + encodeURIComponent( src ) + '}())'; // jshint ignore:line
				} else {
					src = '';
				}

				var iframe = CKEDITOR.dom.element.createFromHtml( '<iframe src="' + src + '" frameBorder="0"></iframe>' );
				iframe.setStyles( { width: '100%', height: '100%' } );
				iframe.addClass( 'cke_wysiwyg_frame' ).addClass( 'cke_reset' );

				var contentSpace = editor.ui.space( 'contents' );
				contentSpace.append( iframe );


				// Asynchronous iframe loading is only required in IE>8 and Gecko (other reasons probably).
				// Do not use it on WebKit as it'll break the browser-back navigation.
				var useOnloadEvent = ( CKEDITOR.env.ie && !CKEDITOR.env.edge ) || CKEDITOR.env.gecko;
				if ( useOnloadEvent )
					iframe.on( 'load', onLoad );

				var frameLabel = editor.title,
					helpLabel = editor.fire( 'ariaEditorHelpLabel', {} ).label;

				if ( frameLabel ) {
					if ( CKEDITOR.env.ie && helpLabel )
						frameLabel += ', ' + helpLabel;

					iframe.setAttribute( 'title', frameLabel );
				}

				if ( helpLabel ) {
					var labelId = CKEDITOR.tools.getNextId(),
						desc = CKEDITOR.dom.element.createFromHtml( '<span id="' + labelId + '" class="cke_voice_label">' + helpLabel + '</span>' );

					contentSpace.append( desc, 1 );
					iframe.setAttribute( 'aria-describedby', labelId );
				}

				// Remove the ARIA description.
				editor.on( 'beforeModeUnload', function( evt ) {
					evt.removeListener();
					if ( desc )
						desc.remove();
				} );

				iframe.setAttributes( {
					tabIndex: editor.tabIndex,
					allowTransparency: 'true'
				} );

				// Execute onLoad manually for all non IE||Gecko browsers.
				!useOnloadEvent && onLoad();

				editor.fire( 'ariaWidget', iframe );

				function onLoad( evt ) {
					evt && evt.removeListener();
					editor.editable( new framedWysiwyg( editor, iframe.$.contentWindow.document.body ) );
					editor.setData( editor.getData( 1 ), callback );
				}
			} );
		}
	} );

	/**
	 * Adds the path to a stylesheet file to the exisiting {@link CKEDITOR.config#contentsCss} value.
	 *
	 * **Note:** This method is available only with the `wysiwygarea` plugin and only affects
	 * classic editors based on it (so it does not affect inline editors).
	 *
	 *		editor.addContentsCss( 'assets/contents.css' );
	 *
	 * @since 4.4.0
	 * @param {String} cssPath The path to the stylesheet file which should be added.
	 * @member CKEDITOR.editor
	 */
	CKEDITOR.editor.prototype.addContentsCss = function( cssPath ) {
		var cfg = this.config,
			curContentsCss = cfg.contentsCss;

		// Convert current value into array.
		if ( !CKEDITOR.tools.isArray( curContentsCss ) )
			cfg.contentsCss = curContentsCss ? [ curContentsCss ] : [];

		cfg.contentsCss.push( cssPath );
	};

	function onDomReady( win ) {
		var editor = this.editor,
			doc = win.document,
			body = doc.body;

		// Remove helper scripts from the DOM.
		var script = doc.getElementById( 'cke_actscrpt' );
		script && script.parentNode.removeChild( script );
		script = doc.getElementById( 'cke_shimscrpt' );
		script && script.parentNode.removeChild( script );
		script = doc.getElementById( 'cke_basetagscrpt' );
		script && script.parentNode.removeChild( script );

		body.contentEditable = true;

		if ( CKEDITOR.env.ie ) {
			// Don't display the focus border.
			body.hideFocus = true;

			// Disable and re-enable the body to avoid IE from
			// taking the editing focus at startup. (https://dev.ckeditor.com/ticket/141 / https://dev.ckeditor.com/ticket/523)
			body.disabled = true;
			body.removeAttribute( 'disabled' );
		}

		delete this._.isLoadingData;

		// Play the magic to alter element reference to the reloaded one.
		this.$ = body;

		doc = new CKEDITOR.dom.document( doc );

		this.setup();
		this.fixInitialSelection();

		var editable = this;

		// Without it IE8 has problem with removing selection in nested editable. (https://dev.ckeditor.com/ticket/13785)
		if ( CKEDITOR.env.ie && !CKEDITOR.env.edge ) {
			doc.getDocumentElement().addClass( doc.$.compatMode );
		}

		// Prevent IE/Edge from leaving a new paragraph/div after deleting all contents in body (https://dev.ckeditor.com/ticket/6966, https://dev.ckeditor.com/ticket/13142).
		if ( CKEDITOR.env.ie && !CKEDITOR.env.edge && editor.enterMode != CKEDITOR.ENTER_P ) {
			removeSuperfluousElement( 'p' );
		}
		// Starting from Edge 15 additional `div` is not added to the editor.
		else if ( CKEDITOR.env.edge && CKEDITOR.env.version < 15 && editor.enterMode != CKEDITOR.ENTER_DIV  ) {
			removeSuperfluousElement( 'div' );
		}

		// Fix problem with cursor not appearing in Webkit and IE11+ when clicking below the body (https://dev.ckeditor.com/ticket/10945, https://dev.ckeditor.com/ticket/10906).
		// Fix for older IEs (8-10 and QM) is placed inside selection.js.
		if ( CKEDITOR.env.webkit || ( CKEDITOR.env.ie && CKEDITOR.env.version > 10 ) ) {
			doc.getDocumentElement().on( 'mousedown', function( evt ) {
				if ( evt.data.getTarget().is( 'html' ) ) {
					// IE needs this timeout. Webkit does not, but it does not cause problems too.
					setTimeout( function() {
						editor.editable().focus();
					} );
				}
			} );
		}

		// Config props: disableObjectResizing and disableNativeTableHandles handler.
		objectResizeDisabler( editor );

		// Enable dragging of position:absolute elements in IE.
		try {
			editor.document.$.execCommand( '2D-position', false, true );
		} catch ( e ) {}

		if ( CKEDITOR.env.gecko || CKEDITOR.env.ie && editor.document.$.compatMode == 'CSS1Compat' ) {
			this.attachListener( this, 'keydown', function( evt ) {
				var keyCode = evt.data.getKeystroke();

				// PageUp OR PageDown
				if ( keyCode == 33 || keyCode == 34 ) {
					// PageUp/PageDown scrolling is broken in document
					// with standard doctype, manually fix it. (https://dev.ckeditor.com/ticket/4736)
					if ( CKEDITOR.env.ie ) {
						setTimeout( function() {
							editor.getSelection().scrollIntoView();
						}, 0 );
					}
					// Page up/down cause editor selection to leak
					// outside of editable thus we try to intercept
					// the behavior, while it affects only happen
					// when editor contents are not overflowed. (https://dev.ckeditor.com/ticket/7955)
					else if ( editor.window.$.innerHeight > this.$.offsetHeight ) {
						var range = editor.createRange();
						range[ keyCode == 33 ? 'moveToElementEditStart' : 'moveToElementEditEnd' ]( this );
						range.select();
						evt.data.preventDefault();
					}
				}
			} );
		}

		if ( CKEDITOR.env.ie ) {
			// [IE] Iframe will still keep the selection when blurred, if
			// focus is moved onto a non-editing host, e.g. link or button, but
			// it becomes a problem for the object type selection, since the resizer
			// handler attached on it will mark other part of the UI, especially
			// for the dialog. (https://dev.ckeditor.com/ticket/8157)
			// [IE<8 & Opera] Even worse For old IEs, the cursor will not vanish even if
			// the selection has been moved to another text input in some cases. (https://dev.ckeditor.com/ticket/4716)
			//
			// Now the range restore is disabled, so we simply force IE to clean
			// up the selection before blur.
			this.attachListener( doc, 'blur', function() {
				// Error proof when the editor is not visible. (https://dev.ckeditor.com/ticket/6375)
				try {
					doc.$.selection.empty();
				} catch ( er ) {}
			} );
		}

		if ( CKEDITOR.env.iOS ) {
			// [iOS] If touch is bound to any parent of the iframe blur happens on any touch
			// event and body becomes the focused element (https://dev.ckeditor.com/ticket/10714).
			this.attachListener( doc, 'touchend', function() {
				win.focus();
			} );
		}

		var title = editor.document.getElementsByTag( 'title' ).getItem( 0 );
		// document.title is malfunctioning on Chrome, so get value from the element (https://dev.ckeditor.com/ticket/12402).
		title.data( 'cke-title', title.getText() );

		// [IE] JAWS will not recognize the aria label we used on the iframe
		// unless the frame window title string is used as the voice label,
		// backup the original one and restore it on output.
		if ( CKEDITOR.env.ie )
			editor.document.$.title = this._.docTitle;

		CKEDITOR.tools.setTimeout( function() {
			// Editable is ready after first setData.
			if ( this.status == 'unloaded' )
				this.status = 'ready';

			editor.fire( 'contentDom' );

			if ( this._.isPendingFocus ) {
				editor.focus();
				this._.isPendingFocus = false;
			}

			setTimeout( function() {
				editor.fire( 'dataReady' );
			}, 0 );
		}, 0, this );

		function removeSuperfluousElement( tagName ) {
			var lockRetain = false;

			// Superfluous elements appear after keydown
			// and before keyup, so the procedure is as follows:
			// 1. On first keydown mark all elements with
			// a specified tag name as non-superfluous.
			editable.attachListener( editable, 'keydown', function() {
				var body = doc.getBody(),
					retained = body.getElementsByTag( tagName );

				if ( !lockRetain ) {
					for ( var i = 0; i < retained.count(); i++ ) {
						retained.getItem( i ).setCustomData( 'retain', true );
					}
					lockRetain = true;
				}
			}, null, null, 1 );

			// 2. On keyup remove all elements that were not marked
			// as non-superfluous (which means they must have had appeared in the meantime).
			// Also we should preserve all temporary elements inserted by editor – otherwise we'd likely
			// leak fake selection's content into editable due to removing hidden selection container (https://dev.ckeditor.com/ticket/14831).
			editable.attachListener( editable, 'keyup', function() {
				var elements = doc.getElementsByTag( tagName );
				if ( lockRetain ) {
					if ( elements.count() == 1 && !elements.getItem( 0 ).getCustomData( 'retain' ) &&
						CKEDITOR.tools.isEmpty( elements.getItem( 0 ).getAttributes() ) ) {
						elements.getItem( 0 ).remove( 1 );
					}
					lockRetain = false;
				}
			} );
		}
	}

	framedWysiwyg = CKEDITOR.tools.createClass( {
		$: function() {
			this.base.apply( this, arguments );

			this._.frameLoadedHandler = CKEDITOR.tools.addFunction( function( win ) {
				// Avoid opening design mode in a frame window thread,
				// which will cause host page scrolling.(https://dev.ckeditor.com/ticket/4397)
				CKEDITOR.tools.setTimeout( onDomReady, 0, this, win );
			}, this );

			this._.docTitle = this.getWindow().getFrame().getAttribute( 'title' );
		},

		base: CKEDITOR.editable,

		proto: {
			setData: function( data, isSnapshot ) {
				var editor = this.editor;

				if ( isSnapshot ) {
					this.setHtml( data );
					this.fixInitialSelection();

					// Fire dataReady for the consistency with inline editors
					// and because it makes sense. (https://dev.ckeditor.com/ticket/10370)
					editor.fire( 'dataReady' );
				}
				else {
					this._.isLoadingData = true;
					editor._.dataStore = { id: 1 };

					var config = editor.config,
						fullPage = config.fullPage,
						docType = config.docType;

					// Build the additional stuff to be included into <head>.
					var headExtra = CKEDITOR.tools.buildStyleHtml( iframeCssFixes() ).replace( /<style>/, '<style data-cke-temp="1">' );

					if ( !fullPage )
						headExtra += CKEDITOR.tools.buildStyleHtml( editor.config.contentsCss );

					var baseTag = config.baseHref ? '<base href="' + config.baseHref + '" data-cke-temp="1" />' : '';

					if ( fullPage ) {
						// Search and sweep out the doctype declaration.
						data = data.replace( /<!DOCTYPE[^>]*>/i, function( match ) {
							editor.docType = docType = match;
							return '';
						} ).replace( /<\?xml\s[^\?]*\?>/i, function( match ) {
							editor.xmlDeclaration = match;
							return '';
						} );
					}

					// Get the HTML version of the data.
					data = editor.dataProcessor.toHtml( data );

					if ( fullPage ) {
						// Check if the <body> tag is available.
						if ( !( /<body[\s|>]/ ).test( data ) )
							data = '<body>' + data;

						// Check if the <html> tag is available.
						if ( !( /<html[\s|>]/ ).test( data ) )
							data = '<html>' + data + '</html>';

						// Check if the <head> tag is available.
						if ( !( /<head[\s|>]/ ).test( data ) )
							data = data.replace( /<html[^>]*>/, '$&<head><title></title></head>' );
						else if ( !( /<title[\s|>]/ ).test( data ) )
							data = data.replace( /<head[^>]*>/, '$&<title></title>' );

						// The base must be the first tag in the HEAD, e.g. to get relative
						// links on styles.
						baseTag && ( data = data.replace( /<head[^>]*?>/, '$&' + baseTag ) );

						// Inject the extra stuff into <head>.
						// Attention: do not change it before testing it well. (V2)
						// This is tricky... if the head ends with <meta ... content type>,
						// Firefox will break. But, it works if we place our extra stuff as
						// the last elements in the HEAD.
						data = data.replace( /<\/head\s*>/, headExtra + '$&' );

						// Add the DOCTYPE back to it.
						data = docType + data;
					} else {
						data = config.docType +
							'<html dir="' + config.contentsLangDirection + '"' +
								' lang="' + ( config.contentsLanguage || editor.langCode ) + '">' +
							'<head>' +
								'<title>' + this._.docTitle + '</title>' +
								baseTag +
								headExtra +
							'</head>' +
							'<body' + ( config.bodyId ? ' id="' + config.bodyId + '"' : '' ) +
								( config.bodyClass ? ' class="' + config.bodyClass + '"' : '' ) +
							'>' +
								data +
							'</body>' +
							'</html>';
					}

					if ( CKEDITOR.env.gecko ) {
						// Hack to make Fx put cursor at the start of doc on fresh focus.
						data = data.replace( /<body/, '<body contenteditable="true" ' );

						// Another hack which is used by onDomReady to remove a leading
						// <br> which is inserted by Firefox 3.6 when document.write is called.
						// This additional <br> is present because of contenteditable="true"
						if ( CKEDITOR.env.version < 20000 )
							data = data.replace( /<body[^>]*>/, '$&<!-- cke-content-start -->'  );
					}

					// The script that launches the bootstrap logic on 'domReady', so the document
					// is fully editable even before the editing iframe is fully loaded (https://dev.ckeditor.com/ticket/4455).
					var bootstrapCode =
						'<script id="cke_actscrpt" type="text/javascript"' + ( CKEDITOR.env.ie ? ' defer="defer" ' : '' ) + '>' +
							'var wasLoaded=0;' +	// It must be always set to 0 as it remains as a window property.
							'function onload(){' +
								'if(!wasLoaded)' +	// FF3.6 calls onload twice when editor.setData. Stop that.
									'window.parent.CKEDITOR.tools.callFunction(' + this._.frameLoadedHandler + ',window);' +
								'wasLoaded=1;' +
							'}' +
							( CKEDITOR.env.ie ? 'onload();' : 'document.addEventListener("DOMContentLoaded", onload, false );' ) +
						'</script>';

					// For IE<9 add support for HTML5's elements.
					// Note: this code must not be deferred.
					if ( CKEDITOR.env.ie && CKEDITOR.env.version < 9 ) {
						bootstrapCode +=
							'<script id="cke_shimscrpt">' +
								'window.parent.CKEDITOR.tools.enableHtml5Elements(document)' +
							'</script>';
					}

					// IE<10 needs this hack to properly enable <base href="...">.
					// See: http://stackoverflow.com/a/13373180/1485219 (https://dev.ckeditor.com/ticket/11910).
					if ( baseTag && CKEDITOR.env.ie && CKEDITOR.env.version < 10 ) {
						bootstrapCode +=
							'<script id="cke_basetagscrpt">' +
								'var baseTag = document.querySelector( "base" );' +
								'baseTag.href = baseTag.href;' +
							'</script>';
					}

					data = data.replace( /(?=\s*<\/(:?head)>)/, bootstrapCode );

					// Current DOM will be deconstructed by document.write, cleanup required.
					this.clearCustomData();
					this.clearListeners();

					editor.fire( 'contentDomUnload' );

					var doc = this.getDocument();

					// Work around Firefox bug - error prune when called from XUL (https://dev.ckeditor.com/ticket/320),
					// defer it thanks to the async nature of this method.
					try {
						doc.write( data );
					} catch ( e ) {
						setTimeout( function() {
							doc.write( data );
						}, 0 );
					}
				}
			},

			getData: function( isSnapshot ) {
				if ( isSnapshot )
					return this.getHtml();
				else {
					var editor = this.editor,
						config = editor.config,
						fullPage = config.fullPage,
						docType = fullPage && editor.docType,
						xmlDeclaration = fullPage && editor.xmlDeclaration,
						doc = this.getDocument();

					var data = fullPage ? doc.getDocumentElement().getOuterHtml() : doc.getBody().getHtml();

					// BR at the end of document is bogus node for Mozilla. (https://dev.ckeditor.com/ticket/5293).
					// Prevent BRs from disappearing from the end of the content
					// while enterMode is ENTER_BR (https://dev.ckeditor.com/ticket/10146).
					if ( CKEDITOR.env.gecko && config.enterMode != CKEDITOR.ENTER_BR )
						data = data.replace( /<br>(?=\s*(:?$|<\/body>))/, '' );

					data = editor.dataProcessor.toDataFormat( data );

					if ( xmlDeclaration )
						data = xmlDeclaration + '\n' + data;
					if ( docType )
						data = docType + '\n' + data;

					return data;
				}
			},

			focus: function() {
				if ( this._.isLoadingData )
					this._.isPendingFocus = true;
				else
					framedWysiwyg.baseProto.focus.call( this );
			},

			detach: function() {
				var editor = this.editor,
					doc = editor.document,
					iframe,
					onResize;

				// Trying to access window's frameElement property on Edge throws an exception
				// when frame was already removed from DOM. (https://dev.ckeditor.com/ticket/13850, https://dev.ckeditor.com/ticket/13790)
				try {
					iframe =  editor.window.getFrame();
				} catch ( e ) {}

				framedWysiwyg.baseProto.detach.call( this );

				// Memory leak proof.
				this.clearCustomData();
				doc.getDocumentElement().clearCustomData();
				CKEDITOR.tools.removeFunction( this._.frameLoadedHandler );

				// On IE, iframe is returned even after remove() method is called on it.
				// Checking if parent is present fixes this issue. (https://dev.ckeditor.com/ticket/13850)
				if ( iframe && iframe.getParent() ) {
					iframe.clearCustomData();
					onResize = iframe.removeCustomData( 'onResize' );
					onResize && onResize.removeListener();

					// IE BUG: When destroying editor DOM with the selection remains inside
					// editing area would break IE7/8's selection system, we have to put the editing
					// iframe offline first. (https://dev.ckeditor.com/ticket/3812 and https://dev.ckeditor.com/ticket/5441)
					iframe.remove();
				} else {
					CKEDITOR.warn( 'editor-destroy-iframe' );
				}
			}
		}
	} );

	function objectResizeDisabler( editor ) {
		if ( CKEDITOR.env.gecko ) {
			// FF allows to change resizing preferences by calling execCommand.
			try {
				var doc = editor.document.$;
				doc.execCommand( 'enableObjectResizing', false, !editor.config.disableObjectResizing );
				doc.execCommand( 'enableInlineTableEditing', false, !editor.config.disableNativeTableHandles );
			} catch ( e ) {}
		} else if ( CKEDITOR.env.ie && CKEDITOR.env.version < 11 && editor.config.disableObjectResizing ) {
			// It's possible to prevent resizing up to IE10.
			blockResizeStart( editor );
		}

		// Disables resizing by preventing default action on resizestart event.
		function blockResizeStart() {
			var lastListeningElement;

			// We'll attach only one listener at a time, instead of adding it to every img, input, hr etc.
			// Listener will be attached upon selectionChange, we'll also check if there was any element that
			// got listener before (lastListeningElement) - if so we need to remove previous listener.
			editor.editable().attachListener( editor, 'selectionChange', function() {
				var selectedElement = editor.getSelection().getSelectedElement();

				if ( selectedElement ) {
					if ( lastListeningElement ) {
						lastListeningElement.detachEvent( 'onresizestart', resizeStartListener );
						lastListeningElement = null;
					}

					// IE requires using attachEvent, because it does not work using W3C compilant addEventListener,
					// tested with IE10.
					selectedElement.$.attachEvent( 'onresizestart', resizeStartListener );
					lastListeningElement = selectedElement.$;
				}
			} );
		}

		function resizeStartListener( evt ) {
			evt.returnValue = false;
		}
	}

	function iframeCssFixes() {
		var css = [];

		// IE>=8 stricts mode doesn't have 'contentEditable' in effect
		// on element unless it has layout. (https://dev.ckeditor.com/ticket/5562)
		if ( CKEDITOR.document.$.documentMode >= 8 ) {
			css.push( 'html.CSS1Compat [contenteditable=false]{min-height:0 !important}' );

			var selectors = [];

			for ( var tag in CKEDITOR.dtd.$removeEmpty )
				selectors.push( 'html.CSS1Compat ' + tag + '[contenteditable=false]' );

			css.push( selectors.join( ',' ) + '{display:inline-block}' );
		}
		// Set the HTML style to 100% to have the text cursor in affect (https://dev.ckeditor.com/ticket/6341)
		else if ( CKEDITOR.env.gecko ) {
			css.push( 'html{height:100% !important}' );
			css.push( 'img:-moz-broken{-moz-force-broken-image-icon:1;min-width:24px;min-height:24px}' );
		}

		// https://dev.ckeditor.com/ticket/6341: The text cursor must be set on the editor area.
		// https://dev.ckeditor.com/ticket/6632: Avoid having "text" shape of cursor in IE7 scrollbars.
		css.push( 'html{cursor:text;*cursor:auto}' );

		// Use correct cursor for these elements
		css.push( 'img,input,textarea{cursor:default}' );

		return css.join( '\n' );
	}
} )();

/**
 * Disables the ability to resize objects (images and tables) in the editing area.
 *
 *		config.disableObjectResizing = true;
 *
 * **Note:** Because of incomplete implementation of editing features in browsers
 * this option does not work for inline editors (see ticket [#10197](https://dev.ckeditor.com/ticket/10197)),
 * does not work in Internet Explorer 11+ (see [#9317](https://dev.ckeditor.com/ticket/9317#comment:16) and
 * [IE11+ issue](https://connect.microsoft.com/IE/feedback/details/742593/please-respect-execcommand-enableobjectresizing-in-contenteditable-elements)).
 * In Internet Explorer 8-10 this option only blocks resizing, but it is unable to hide the resize handles.
 *
 * @cfg
 * @member CKEDITOR.config
 */
CKEDITOR.config.disableObjectResizing = false;

/**
 * Disables the "table tools" offered natively by the browser (currently
 * Firefox only) to perform quick table editing operations, like adding or
 * deleting rows and columns.
 *
 *		config.disableNativeTableHandles = false;
 *
 * @cfg
 * @member CKEDITOR.config
 */
CKEDITOR.config.disableNativeTableHandles = true;

/**
 * Disables the built-in spell checker if the browser provides one.
 *
 * **Note:** Although word suggestions provided natively by the browsers will
 * not appear in CKEditor's default context menu,
 * users can always reach the native context menu by holding the
 * *Ctrl* key when right-clicking if {@link #browserContextMenuOnCtrl}
 * is enabled or you are simply not using the
 * [context menu](https://ckeditor.com/cke4/addon/contextmenu) plugin.
 *
 *		config.disableNativeSpellChecker = false;
 *
 * @cfg
 * @member CKEDITOR.config
 */
CKEDITOR.config.disableNativeSpellChecker = true;

/**
 * Language code of  the writing language which is used to author the editor
 * content. This option accepts one single entry value in the format defined in the
 * [Tags for Identifying Languages (BCP47)](http://www.ietf.org/rfc/bcp/bcp47.txt)
 * IETF document and is used in the `lang` attribute.
 *
 *		config.contentsLanguage = 'fr';
 *
 * @cfg {String} [contentsLanguage=same value with editor's UI language]
 * @member CKEDITOR.config
 */

/**
 * The base href URL used to resolve relative and absolute URLs in the
 * editor content.
 *
 *		config.baseHref = 'http://www.example.com/path/';
 *
 * @cfg {String} [baseHref='']
 * @member CKEDITOR.config
 */

/**
 * Whether to automatically create wrapping blocks around inline content inside the document body.
 * This helps to ensure the integrity of the block *Enter* mode.
 *
 * **Note:** This option is deprecated. Changing the default value might introduce unpredictable usability issues and is
 * highly unrecommended.
 *
 *		config.autoParagraph = false;
 *
 * @deprecated
 * @since 3.6.0
 * @cfg {Boolean} [autoParagraph=true]
 * @member CKEDITOR.config
 */

/**
 * Fired when some elements are added to the document.
 *
 * @event ariaWidget
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param {CKEDITOR.dom.element} data The element being added.
 */

CKEDITOR.config.plugins='dialogui,dialog,a11yhelp,about,basicstyles,blockquote,notification,button,toolbar,clipboard,panelbutton,panel,floatpanel,colorbutton,dialogadvtab,div,elementspath,enterkey,floatingspace,listblock,richcombo,format,horizontalrule,htmlwriter,image,indent,indentlist,indentblock,justify,fakeobjects,link,list,menu,contextmenu,liststyle,magicline,maximize,pastefromword,pastetext,print,removeformat,resize,sourcearea,specialchar,stylescombo,tab,table,tabletools,templates,undo,wysiwygarea';CKEDITOR.config.skin='moono';(function() {var setIcons = function(icons, strip) {var path = CKEDITOR.getUrl( 'plugins/' + strip );icons = icons.split( ',' );for ( var i = 0; i < icons.length; i++ )CKEDITOR.skin.icons[ icons[ i ] ] = { path: path, offset: -icons[ ++i ], bgsize : icons[ ++i ] };};if (CKEDITOR.env.hidpi) setIcons('about,0,,bold,24,,italic,48,,strike,72,,subscript,96,,superscript,120,,underline,144,,blockquote,168,,copy-rtl,192,,copy,216,,cut-rtl,240,,cut,264,,paste-rtl,288,,paste,312,,bgcolor,336,,textcolor,360,,creatediv,384,,horizontalrule,408,,image,432,,indent-rtl,456,,indent,480,,outdent-rtl,504,,outdent,528,,justifyblock,552,,justifycenter,576,,justifyleft,600,,justifyright,624,,anchor-rtl,648,,anchor,672,,link,696,,unlink,720,,bulletedlist-rtl,744,,bulletedlist,768,,numberedlist-rtl,792,,numberedlist,816,,maximize,840,,pastefromword-rtl,864,,pastefromword,888,,pastetext-rtl,912,,pastetext,936,,print,960,,removeformat,984,,source-rtl,1008,,source,1032,,specialchar,1056,,table,1080,,templates-rtl,1104,,templates,1128,,redo-rtl,1152,,redo,1176,,undo-rtl,1200,,undo,1224,','icons_hidpi.png');else setIcons('about,0,auto,bold,24,auto,italic,48,auto,strike,72,auto,subscript,96,auto,superscript,120,auto,underline,144,auto,blockquote,168,auto,copy-rtl,192,auto,copy,216,auto,cut-rtl,240,auto,cut,264,auto,paste-rtl,288,auto,paste,312,auto,bgcolor,336,auto,textcolor,360,auto,creatediv,384,auto,horizontalrule,408,auto,image,432,auto,indent-rtl,456,auto,indent,480,auto,outdent-rtl,504,auto,outdent,528,auto,justifyblock,552,auto,justifycenter,576,auto,justifyleft,600,auto,justifyright,624,auto,anchor-rtl,648,auto,anchor,672,auto,link,696,auto,unlink,720,auto,bulletedlist-rtl,744,auto,bulletedlist,768,auto,numberedlist-rtl,792,auto,numberedlist,816,auto,maximize,840,auto,pastefromword-rtl,864,auto,pastefromword,888,auto,pastetext-rtl,912,auto,pastetext,936,auto,print,960,auto,removeformat,984,auto,source-rtl,1008,auto,source,1032,auto,specialchar,1056,auto,table,1080,auto,templates-rtl,1104,auto,templates,1128,auto,redo-rtl,1152,auto,redo,1176,auto,undo-rtl,1200,auto,undo,1224,auto','icons.png');})();
}());