var div = document.getElementById("div");
var time = document.getElementById("time");
var time2 = document.getElementById("time2");
var i = 0;  
var last = new Date().getTime();
var last2 = new Date().getTime();
requestAnimationFrame(function a(){
  var now = new Date().getTime();
  time.innerHTML = now - last;
  last = now;
  div.style.top = (i = (i+5)%1000) + "px";
  requestAnimationFrame(a);
});


var div2 = document.getElementById("div2");
var i2 = 0;        
setTimeout(function a(){
  var now = new Date().getTime();
  time2.innerHTML = now - last2;
  last2 = now;
  div2.style.top = (i2 = (i2+5)%1000) + "px";
  setTimeout(a);
});