JavaScript Detecting browser Feature Detection Method


Example

This method looks for the existence of browser specific things. This would be more difficult to spoof, but is not guaranteed to be future proof.

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

// Firefox 1.0+
var isFirefox = typeof InstallTrigger !== 'undefined';
    
// At least Safari 3+: "[object HTMLElementConstructor]"
var isSafari = Object.prototype.toString.call(window.HTMLElement).indexOf('Constructor') > 0;

// 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;

Successfully tested in:

  • Firefox 0.8 - 44
  • Chrome 1.0 - 48
  • Opera 8.0 - 34
  • Safari 3.0 - 9.0.3
  • IE 6 - 11
  • Edge - 20-25

Credit to Rob W