text: //.CommonJS
  var CSSOM = {
  	CSSStyleSheet: require("./CSSStyleSheet").CSSStyleSheet,
  	CSSStyleRule: require("./CSSStyleRule").CSSStyleRule,
  	CSSMediaRule: require("./CSSMediaRule").CSSMediaRule,
  	CSSStyleDeclaration: require("./CSSStyleDeclaration").CSSStyleDeclaration,
  	CSSKeyframeRule: require('./CSSKeyframeRule').CSSKeyframeRule,
  	CSSKeyframesRule: require('./CSSKeyframesRule').CSSKeyframesRule
  };
  ///CommonJS
  
  
  /**
   * Produces a deep copy of stylesheet — the instance variables of stylesheet are copied recursively.
   * @param {CSSStyleSheet|CSSOM.CSSStyleSheet} stylesheet
   * @nosideeffects
   * @return {CSSOM.CSSStyleSheet}
   */
  CSSOM.clone = function clone(stylesheet) {
  
  	var cloned = new CSSOM.CSSStyleSheet;
  
  	var rules = stylesheet.cssRules;
  	if (!rules) {
  		return cloned;
  	}
  
  	var RULE_TYPES = {
  		1: CSSOM.CSSStyleRule,
  		4: CSSOM.CSSMediaRule,
  		//3: CSSOM.CSSImportRule,
  		//5: CSSOM.CSSFontFaceRule,
  		//6: CSSOM.CSSPageRule,
  		8: CSSOM.CSSKeyframesRule,
  		9: CSSOM.CSSKeyframeRule
  	};
  
  	for (var i=0, rulesLength=rules.length; i < rulesLength; i++) {
  		var rule = rules[i];
  		var ruleClone = cloned.cssRules[i] = new RULE_TYPES[rule.type];
  
  		var style = rule.style;
  		if (style) {
  			var styleClone = ruleClone.style = new CSSOM.CSSStyleDeclaration;
  			for (var j=0, styleLength=style.length; j < styleLength; j++) {
  				var name = styleClone[j] = style[j];
  				styleClone[name] = style[name];
  				styleClone._importants[name] = style.getPropertyPriority(name);
  			}
  			styleClone.length = style.length;
  		}
  
  		if (rule.hasOwnProperty('keyText')) {
  			ruleClone.keyText = rule.keyText;
  		}
  
  		if (rule.hasOwnProperty('selectorText')) {
  			ruleClone.selectorText = rule.selectorText;
  		}
  
  		if (rule.hasOwnProperty('mediaText')) {
  			ruleClone.mediaText = rule.mediaText;
  		}
  
  		if (rule.hasOwnProperty('cssRules')) {
  			ruleClone.cssRules = clone(rule).cssRules;
  		}
  	}
  
  	return cloned;
  
  };
  
  //.CommonJS
  exports.clone = CSSOM.clone;
  ///CommonJS
  