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chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/selection/065.xhtml 

<?xml version="1.0" encoding="utf-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Cross iframe selection drag and drop between text inputs</title>
<style type="text/css">
iframe
  {width:100%;
  height:200px;
  border-style:none;}
</style>
</head>
<body>
<p><iframe src="helper-drag-me-input-to-other-input.xhtml">XHTML document</iframe></p>
<p><iframe src="helper-drop-here-input.xhtml">XHTML document</iframe></p>
</body>
</html>