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requst Animation frame shim

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js requestAniFrame snippet
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// 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);
})();

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