Detect IE in javascript Had issues with a CMS I use removing conditional statements in the page so figured this would be a way if I ever need to do it again. Taken from: http://abbett.org/post/a-guide-to-building-webapps-with-ie8-support

ie-version.js

var ie = (function(){

    var undef,
        v = 3,
        div = document.createElement('div'),
        all = div.getElementsByTagName('i');

    while (
        div.innerHTML = '<!--[if gt IE ' + (++v) + ']><i></i><![endif]-->',
            all[0]
        );

    if (Function('/*@cc_on return document.documentMode===10@*/')()){
        v = 10;
    }

    return v > 4 ? v : undef;

}());