public/ckeditor/4.4dev/core/editable.js
function( cls ) {
				var classes = this.getCustomData( 'classes' );
				if ( !this.hasClass( cls ) ) {
					!classes && ( classes = [] ), classes.push( cls );
					this.setCustomData( 'classes', classes );
					this.addClass( cls );
				}
			}
function( cls ) {
				var classes = this.getCustomData( 'classes' );
				if ( !this.hasClass( cls ) ) {
					!classes && ( classes = [] ), classes.push( cls );
					this.setCustomData( 'classes', classes );
					this.addClass( cls );
				}
			}
function ( cls ) { var classes = this . getCustomData ( 'classes' ) ; if ( ! this . hasClass ( cls ) ) { ! classes && ( classes = [ ] ) , classes . push ( cls ) ; this . setCustomData ( 'classes' , classes ) ; this . addClass ( cls ) ; } }
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
Adds a CSS class name to this editable that needs to be removed on detaching .