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// Opera 8.0+
var isOpera = (!!window.opr && !!opr.addons) || !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0;

// Firefox 1.0+
var isFirefox = typeof InstallTrigger !== 'undefined';

// Safari 3.0+ "[object HTMLElementConstructor]"
var isSafari = /constructor/i.test(window.HTMLElement) || (function (p) {
       return p.toString() === "[object SafariRemoteNotification]";
   })(!window['safari'] || safari.pushNotification);

//Работает лучше - брать это определение
var isSafari2 = navigator.vendor && navigator.vendor.indexOf('Apple') > -1 &&
   navigator.userAgent && !navigator.userAgent.match('CriOS');


// Internet Explorer 6-11
var isIE = /*@cc_on!@*/false || !!document.documentMode;

// Edge 20+
var isEdge = !isIE && !!window.StyleMedia;

// Chrome 1+
var isChrome = !!window.chrome && !!window.chrome.webstore;

// Blink engine detection
var isBlink = (isChrome || isOpera) && !!window.CSS;

if (isChrome) {...}