code: 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' );
  				}
  			}
  		}
docs: Makes the element and its children unselectable.
  
  var element = CKEDITOR.document.getById( 'myElement' );
  element.unselectable();
  
  @method