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chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/selection/helper-drag-me-input-to-other-textarea.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="document.querySelector('input').select()">
<p>Drag selected text to the textarea. Copy of selection should end up in the textarea once you drop it there.</p>
<p><input value="Drag me"/></p>
</body>
</html>