<!DOCTYPE html>
<html>
<head>
<script>
onload = function() {
   document.body.offsetLeft;
   var video = document.createElement('video');
   var ol = document.querySelector('ol');
   document.body.appendChild(video);
   ol.setAttribute('reversed', 'reversed');
}
</script>
</head>
<body>
<ol>
  <li>1</li>
  <li>2</li>
</ol>
</body>
</html>