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chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/reload/010-1.xhtml 

<?xml version="1.0" encoding="utf-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Reload during drag and drop: helper file</title>
</head>
<body onload="document.querySelector('input').select()" ondragleave="window.location.reload()">
<p><input value="Drag me"/></p>
</body>
</html>