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chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/images/helper-circle.xhtml 

<?xml version="1.0" encoding="utf-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Image drag and drop: helper file</title>
</head>
<body>
<p><img src="../resources/circle.png" alt="PNG circle" ondragstart="event.dataTransfer.effectAllowed = 'copy'"/></p>
</body>
</html>