text: /**
   * @license Copyright (c) 2003-2018, 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 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 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
  		 * @param {String} selector
  		 * @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 first element within this element that matches specified `selector`.
  		 *
  		 * **Notes:**
  		 *
  		 *	* Not available in IE7.
  		 *	* Unlike native `querySelectorAll` 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
  		 * @param {String} selector
  		 * @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
  		 * @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;
  	};
  } )();
  