mozilla-release/layout/reftests/webm-video/clipping-1-ref.html

<!DOCTYPE HTML>
<html>
<body style="background:white">
<div style="position:absolute; left:0; top:0; width:200px; height:600px;">
  <video src="black140x100.webm" style="width:400px; margin-left:-100px;"></video>
</div>
<div style="position:absolute; left:200px; top:0; background:white; width:200px; height:600px;"></div>
</body>
</html>