code: function fixRelativeUrls(cssText, href) {
  	var base = resolveRelativeUrl(href, document.baseURI);
  	return cssText.replace(URL_VALUE_REGEXP, function(match, quote, url1, url2) {
  		var url = url1 || url2;
  		if (!url) {
  			return match;
  		}
  		return 'url(' + (quote || '"') + resolveRelativeUrl(url, base) + (quote || '"') + ')';
  	});
  }
docs: Replace relative CSS URLs with their absolute counterpart
  
  @param  {string} cssText
  @param  {string} href    URL of the stylesheet
  @return {string}