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<!DOCTYPE html>
<html>
<body>
<div id="mydiv" style="position:relative;">Some text.</div>
<script>
const adiv = document.getElementById("mydiv");
let leftPos = 0;
function moveDiv(timestamp){
  leftPos += 5;
  adiv.style.left = leftPos + "px";
  requestAnimationFrame(moveDiv);
}
requestAnimationFrame(moveDiv);
</script>
</body>
</html>