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chromium/third_party/blink/web_tests/media/media-controls-clone.html 

<!DOCTYPE html>
<!-- This should be converted to a reftest in the future. -->
<body>
<!-- 
  There are two pairs of <video> and <audio> with controls.
  These pairs should have identical appearance.
 -->
<div><video controls id=v></video><audio controls id=a></audio></div>
<div id=dest></div>

<script>
var dest = document.getElementById('dest');
dest.appendChild(document.getElementById('v').cloneNode());
dest.appendChild(document.getElementById('a').cloneNode());
</script>
</body>