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chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/selection/031.xhtml 

<?xml version="1.0" encoding="utf-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Dragging two lines of text selection from textarea to block element</title>
<style type="text/css">
div[ondragenter]
  {width:300px;
  height:100px;
  margin-top:20px;
  padding:10px;
  color:white;
  background-color:navy;}
textarea
  {width:300px;
  height:100px;}
</style>
</head>
<body onload="var t = document.querySelector('textarea');t.select();t.setSelectionRange(25,56)">
<p>
<textarea>
Here is textarea
with selection that
spans two lines.
Drag selected text to the blue box.
Selected text should be moved to the blue box once you drop it there.
</textarea>
</p>
<div
  ondragenter="event.preventDefault()"
  ondragover="return false"
  ondrop="document.querySelector('div').appendChild(document.createTextNode(event.dataTransfer.getData('text/plain')))"
/>
</body>
</html>