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chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/selection/030.xhtml 

<?xml version="1.0" encoding="utf-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Selection drag and drop from textarea to contenteditable element</title>
<style type="text/css">
div[contenteditable]
  {width:300px;
  height:100px;
  margin-top:20px;
  padding:10px;
  color:white;
  background-color:navy;}
textarea
  {height:1.5em;
  width:7em;}
</style>
</head>
<body onload="var t = document.querySelector('textarea');t.select();t.setSelectionRange(0,7)">
<p>Drag selected text to the blue box. Selected text should be moved to the blue box once you drop it there.</p>
<p><textarea>Drag me</textarea></p>
<div contenteditable="true"/>
</body>
</html>