julianshapiro

var requestAnimationFrame = window.requestAnimationFrame || (function() { 
        var timeLast = 0;

        return window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || function(callback) {                
            var timeCurrent = (new Date()).getTime(),
                timeDelta;

            /* Dynamically set the delay on a per-tick basis to more closely match 60fps. */
            /* Technique by Erik Moller. MIT license: https://gist.github.com/paulirish/1579671. */
            timeDelta = Math.max(0, 16 - (timeCurrent - timeLast));

julianshapiro

var IE = (function() { 
        if (document.documentMode) {
            return document.documentMode;
        } else {
            for (var i = 7; i > 4; i--) {
                var div = document.createElement("div");

                div.innerHTML = "<!--[if IE " + i + "]><span></span><![endif]-->";

                if (div.getElementsByTagName("span").length) {