hack jQuery to use requestAnimationFrame for animations

jquery.raf.coffee

# hack jQuery to use requestAnimationFrame for animations
((win, $)->  
  # use Modernizr to get the (prefixed)DOM method
  raf = Modernizr.prefixed('requestAnimationFrame', win)
  
  if not raf
    return
  
  animating = false;
  
  tick = ()->
    if animating
      raf(tick)
      $.fx.tick()

  $.fx.timer = (timer)->
    if timer() and $.timers.push(timer) and !animating
      animating = true
      tick()

  $.fx.stop = ()->
    animating = false
)(window, jQuery)

jquery.raf.js

(function(win, $) {
  var animating, raf, tick;
  raf = Modernizr.prefixed('requestAnimationFrame', win);
  if (!raf) {
    return;
  }
  animating = false;
  
  function tick() {
    if (animating) {
      raf(tick);
      $.fx.tick();
    }
  };
  $.fx.timer = function(timer) {
    if (timer() && $.timers.push(timer) && !animating) {
      animating = true;
      tick();
    }
  };
  $.fx.stop = function() {
    animating = false;
  };
})(window, jQuery);