<?xml version="1.0" encoding="utf-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>History navigation during drag and drop: helper file</title>
<style type="text/css">
div[ondragenter]
	{margin:200px 0 0 200px;
	width:200px;
	height:100px;
	color:white;
	background-color:navy;}
div[ondragenter]:before
	{display:block;
	content:"";
	border-style:solid;
	position:relative;
	top:-50px;
	left:-200px;
	border-width:100px;
	border-color:transparent navy transparent transparent;}
</style>
</head>
<body>
<p>Drag box to the blue arrow but don't drop it yet. You should be returned back to start page.</p>
<div ondragenter="event.preventDefault()" ondragover="history.go(-1)"/>
</body>
</html>