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chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/selection/helper-drop-here-blue-box-contenteditable.xhtml 

<?xml version="1.0" encoding="utf-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Selection drag and drop: helper file</title>
<style type="text/css">
div[contenteditable]
  {width:300px;
  height:100px;
  margin-top:20px;
  padding:10px;
  color:white;
  background-color:navy;}
</style>
</head>
<body>
<div contenteditable="true"/>
</body>
</html>