public/ckeditor/4.4dev/core/htmlparser/element.js
function( className ) {
			var classes = this.attributes[ 'class' ];

			if ( !classes )
				return;

			// We can safely assume that className won't break regexp.
			// http://stackoverflow.com/questions/448981/what-characters-are-valid-in-css-class-names
			classes = CKEDITOR.tools.trim( classes.replace( new RegExp( '(?:\\s+|^)' + className + '(?:\\s+|$)' ), ' ' ) );

			if ( classes )
				this.attributes[ 'class' ] = classes;
			else
				delete this.attributes[ 'class' ];
		}
function( className ) {
			var classes = this.attributes[ 'class' ];

			if ( !classes )
				return;

			// We can safely assume that className won't break regexp.
			// http://stackoverflow.com/questions/448981/what-characters-are-valid-in-css-class-names
			classes = CKEDITOR.tools.trim( classes.replace( new RegExp( '(?:\\s+|^)' + className + '(?:\\s+|$)' ), ' ' ) );

			if ( classes )
				this.attributes[ 'class' ] = classes;
			else
				delete this.attributes[ 'class' ];
		}
function ( className ) { var classes = this . attributes [ 'class' ] ; if ( ! classes ) return ; // We can safely assume that className won't break regexp. // http://stackoverflow.com/questions/448981/what-characters-are-valid-in-css-class-names classes = CKEDITOR . tools . trim ( classes . replace ( new RegExp ( '(?:\\s+|^)' + className + '(?:\\s+|$)' ) , ' ' ) ) ; if ( classes ) this . attributes [ 'class' ] = classes ; else delete this . attributes [ 'class' ] ; }
Removes a class name from the list of classes.

@since 4.3
@param {String} className The class name to be removed.
Removes a class name from the list of classes .