js/plugin/prefixfree.js

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/**
 * StyleFix 1.0.3 & PrefixFree 1.0.7
 * @author Lea Verou
 * MIT license
 */

(function(){

if(!window.addEventListener) {
	return;
}

var self = window.StyleFix = {
	link: function(link) {
		try {
			// Ignore stylesheets with data-noprefix attribute as well as alternate stylesheets
			if(link.rel !== 'stylesheet' || link.hasAttribute('data-noprefix')) {
				return;
			}
		}
		catch(e) {
			return;
		}

		var url = link.href || link.getAttribute('data-href'),
		    base = url.replace(/[^\/]+$/, ''),
		    base_scheme = (/^[a-z]{3,10}:/.exec(base) || [''])[0],
		    base_domain = (/^[a-z]{3,10}:\/\/[^\/]+/.exec(base) || [''])[0],
		    base_query = /^([^?]*)\??/.exec(url)[1],
		    parent = link.parentNode,
		    xhr = new XMLHttpRequest(),
		    process;
		
		xhr.onreadystatechange = function() {
			if(xhr.readyState === 4) {
				process();
			}
		};

		process = function() {
				var css = xhr.responseText;
				
				if(css && link.parentNode && (!xhr.status || xhr.status < 400 || xhr.status > 600)) {
					css = self.fix(css, true, link);
					
					// Convert relative URLs to absolute, if needed
					if(base) {
						css = css.replace(/url\(\s*?((?:"|')?)(.+?)\1\s*?\)/gi, function($0, quote, url) {
							if(/^([a-z]{3,10}:|#)/i.test(url)) { // Absolute & or hash-relative
								return $0;
							}
							else if(/^\/\//.test(url)) { // Scheme-relative
								// May contain sequences like /../ and /./ but those DO work
								return 'url("' + base_scheme + url + '")';
							}
							else if(/^\//.test(url)) { // Domain-relative
								return 'url("' + base_domain + url + '")';
							}
							else if(/^\?/.test(url)) { // Query-relative
								return 'url("' + base_query + url + '")';