https://www.ocr.org.uk/js/browser.js

1/*global $, jQuery*/
2/*global navigator*/
3var matched, browser;
4jQuery.uaMatch = function (ua) {
5    'use strict';
6    ua = ua.toLowerCase();
7    var match = /(chrome)[ \/]([\w.]+)/.exec(ua) ||
8            /(webkit)[ \/]([\w.]+)/.exec(ua) ||
9            /(opera)(?:.*version|)[ \/]([\w.]+)/.exec(ua) ||
10            /(msie) ([\w.]+)/.exec(ua) ||
11            ua.indexOf("compatible") < 0 && /(mozilla)(?:.*? rv:([\w.]+)|)/.exec(ua) || [];
12    return {
13        browser: match[1] || "",
14        version: match[2] || "0"
15    };
16};
17matched = jQuery.uaMatch(navigator.userAgent);
18browser = {};
19if (matched.browser) {
20    browser[matched.browser] = true;
21    browser.version = matched.version;
22}
23// Chrome is Webkit, but Webkit is also Safari.
24if (browser.chrome) {
25    browser.webkit = true;
26} else if (browser.webkit) {
27    browser.safari = true;
28}
29jQuery.browser = browser;