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chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/remove/helper-drag-me-p.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>
</head>
<body onload="window.getSelection().selectAllChildren(document.querySelector('p'))">
<p>Drag me</p>
</body>
</html>