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chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/selection/018.xhtml 

<?xml version="1.0" encoding="utf-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Selection drag and drop from password input to textarea</title>
<style type="text/css">
textarea
  {width:300px;
  height:100px;
  margin-top:20px;
  padding:10px;}
</style>
</head>
<body onload="document.querySelector('input').select()">
<p>You should not be able to drag and drop selection from password field to the textarea.</p>
<p><input type="password" value="FAIL"/></p>
<p><textarea placeholder="Drop selection here"/></p>
</body>
</html>