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chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/overlay/057.xhtml 

<?xml version="1.0" encoding="utf-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Drag feedback for partly visible float: negative margins</title>
<style type="text/css">
p
  {margin-top:0;}
div
  {float:left;
  margin:-150px 0 0 -150px;
  height:200px;
  width:200px;
  background-color:navy;}
</style>
</head>
<body>
<div draggable="true" ondragstart="event.dataTransfer.effectAllowed = 'copy'"/>
<p>Try to drag blue box above. Feedback overlay should be square.</p>
</body>
</html>