requst Animation frame shim

js requestAniFrame snippet

   // shim layer with setTimeout fallback
    window.requestAnimFrame = (function(){
      return  window.requestAnimationFrame       || 
              window.webkitRequestAnimationFrame || 
              window.mozRequestAnimationFrame    || 
              window.oRequestAnimationFrame      || 
              window.msRequestAnimationFrame     || 
              function(/* function */ callback, /* DOMElement */ element){
                window.setTimeout(callback, 1000 / 60);
              };
    })();
 
 
    // usage: 
    // instead of setInterval(render, 16) ....
 
    (function animloop(){
      render();
      requestAnimFrame(animloop, element);
    })();