docs: 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;
  	}