freeCodeCamp/views/partials/css-cdns.jade

script.
    var cb = function () {
        var l = document.createElement('link');
        l.rel = 'stylesheet';
        l.href = 'main'
        var h = document.getElementsByTagName('head')[0];
        h.parentNode.insertBefore(l, h);
    };
    var raf = requestAnimationFrame || mozRequestAnimationFrame ||
            webkitRequestAnimationFrame || msRequestAnimationFrame;
    if (raf) raf(cb);
    else window.addEventListener('load', cb);

    var cb = function() {
        var l = document.createElement('link'); l.rel = 'stylesheet';
        l.href = '//maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css';
        var h = document.getElementsByTagName('head')[0]; h.parentNode.insertBefore(l, h);
    };
    var raf = requestAnimationFrame || mozRequestAnimationFrame ||
        webkitRequestAnimationFrame || msRequestAnimationFrame;
    if (raf) raf(cb);
    else window.addEventListener('load', cb);

    var cb = function () {
        var l = document.createElement('link');
        l.rel = 'stylesheet';
        l.href = '//maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css';
        var h = document.getElementsByTagName('head')[0];
        h.parentNode.insertBefore(l, h);
    };
    var raf = requestAnimationFrame || mozRequestAnimationFrame ||
            webkitRequestAnimationFrame || msRequestAnimationFrame;
    if (raf) raf(cb);
    else window.addEventListener('load', cb);