requestNextAnimFrame()

gistfile1.js

window.requestNextAnimationFrame = (function() {
var originalWebkitMethod,
    wrapper = undefined,
    callback = undefined,
    geckVersion = 0,
    userAgent = navigator.userAgent,
    index = 0,
    self = this;

// Workaround for Chrome 10 bug where Chrome does 
// not pass the time to the animation function
if (window.webkitRequestAnimationFrame) {
    // Define the wrapper
    wrapp = function(time) {
        if (time === undefined) {
            time = +new Date();
        }
        self.callback(time);
    };

    // Make the switch
    originalWebkitMethod = window.webkitRequestAnimationFrame;

    window.webkitRequestAnimationFrame = function(callback, element) {
        self.callback = callback;

        // Browser calls wrapper; wrapper calls callback
        originalWebkitMethod(wrapper, element);
    }
}

// Workaround for Gecko 2.0, which has a bug in mozRequestAnimationFrame()
// that restricts animations to 30-40 fps.
if (window.mozRequestAnimationFrame) {
    // Check the Gecho version. Gecko is used by browsers other than
    // Firefox. Gecko 2.0 corresponds to Firefox 4.0
    index = userAgent.indexOf('rv:');

    if (userAgent.indexOf('Gecko') != -1) {
        geckoVersion = userAgent.substr(index + 3, 3);

        if (geckoVersion === '2.0') {
            // Forces the return statement to fall through to the setTimeout() function
            window.mozRequestAnimationFrame = undefined;
        }
    }
}

return window.requestAnimationFrame     ||
    window.webkitRequestAnimationFrame  ||
    window.mozRequestAnimationFrame     ||
    window.oRequestAnimationFrame       ||
    window.msRequestAnimationFrame      ||

    function(callback, element) {
        var start,
            finish;

        window.setTimeout(function() {
            start = +new Date();
            callback(start);
            finish = +new Date();

            self.timeout = 1000 / 60 - (finish - start);
        }, self.timeout);
    };
})();


// window.requestNextAnimationFrame(animate);