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chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/overlay/013.xhtml 

<?xml version="1.0" encoding="utf-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Feedback image and CSS transforms</title>
<style type="text/css">
body
  {background-color:silver;
  margin:0;}
div
  {background-color:white;}
div > div
  {display:block;
  width:100px;
  height:87px;
  transform-origin:bottom right;
  transform:skew(-30deg);
  -o-transform-origin:bottom right;
  -o-transform:skew(-30deg);
  background-color:green;}
</style>
</head>
<body>
<div>
  <div draggable="true" ondragstart="event.dataTransfer.effectAllowed = 'copy'"/>
</div>
<p>Try to drag green rhomb above. Feedback overlay should not be rectangular.</p>
</body>
</html>