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chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/selection/133.xhtml 

<?xml version="1.0" encoding="utf-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Multielement selection drag and drop</title>
<style type="text/css">
textarea
  {width:300px;
  height:100px;
  margin-top:20px;
  padding:10px;}
</style>
</head>
<body onload="window.getSelection().selectAllChildren(document.querySelector('div'))">
<div>
  <p>Drag selected text to the textarea.</p>
  <p>Copy of selection should end up in the textarea once you drop it there.</p>
</div>
<p><textarea placeholder="Drop selection here"/></p>
</body>
</html>