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chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/images/011.xhtml 

<?xml version="1.0" encoding="utf-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Image drag and drop between iframes</title>
<style type="text/css">
iframe
  {width:160px;
  height:160px;
  border-style:none;}
</style>
</head>
<body>
<p><iframe src="helper-circle.xhtml">XHTML with image</iframe></p>
<p>Drag circle above to the box below. It should be copied to the box once you drop it there.</p>
<p><iframe src="helper-drop-image-here.xhtml">XHTML with image</iframe></p>
</body>
</html>