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);

 

    // 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;

 

var output = 'Detecting browsers by ducktyping:<hr>';

output += 'isFirefox: ' + isFirefox + '<br>';

output += 'isChrome: ' + isChrome + '<br>';

output += 'isSafari: ' + isSafari + '<br>';

output += 'isOpera: ' + isOpera + '<br>';

output += 'isIE: ' + isIE + '<br>';

output += 'isEdge: ' + isEdge + '<br>';

output += 'isBlink: ' + isBlink + '<br>';

document.body.innerHTML = output;