requestAnimationFrame.js

var requestAnimation, start;

start = null;

requestAnimation = function(timestamp) {
  var progress;
  
  if (!start) {
    start = timestamp;
  }
  
  progress = timestamp - start;
  console.log('RequestAnimationFrame: ' + progress);
  return window.requestAnimationFrame(requestAnimation);
};

window.requestAnimationFrame(requestAnimation);