2124   hasClassName: function(element, className) {  argument
2126     var elementClassName = element.className;
2127     return (elementClassName.length > 0 && (elementClassName == className ||
2128       new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
2131   addClassName: function(element, className) {  argument
2133     if (!Element.hasClassName(element, className))
2134       element.className += (element.className ? ' ' : '') + className;
2138   removeClassName: function(element, className) {  argument
2140     element.className = element.className.replace(
2141       new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
2145   toggleClassName: function(element, className) {  argument
2147     return Element[Element.hasClassName(element, className) ?
2148       'removeClassName' : 'addClassName'](element, className);
2447       className: 'class',  property in Element._attributeTranslations.write.names
2586     if (el.className !== 'x') {
2588       if (el.className === 'x') {
3359     span.className = 'Test';
3380     className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
3475     className:    'n = h.className(n, r, "#{1}", c);    c = false;',
3511     className: function(element, matches) {
3690     className: function(nodes, root, className, combinator) {  argument
3692       return Selector.handlers.byClassName(nodes, root, className);
3695     byClassName: function(nodes, root, className) {  argument
3697       var needle = ' ' + className + ' ';
3699         nodeClassName = node.className;
3701         if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
4814   function(element, className) {
4815     className = className.toString().strip();
4816     var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
4818   } : function(element, className) {
4819     className = className.toString().strip();
4820     var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
4821     if (!classNames && !className) return elements;
4824     className = ' ' + className + ' ';
4827       if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
4836   return function(className, parentElement) {  argument
4837     return $(parentElement || document.body).getElementsByClassName(className);
4850     this.element.className.split(/\s+/).select(function(name) {
4855   set: function(className) {
4856     this.element.className = className;