docs: 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 (#6046).
  		if ( attrs.contenteditable != 'false' )
  			attrs[ 'data-cke-editable' ] = attrs.contenteditable ? 'true' : 1;
  
  		attrs.contenteditable = 'false';
  	}