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chromium/third_party/blink/web_tests/fast/dom/comment-not-documentElement.html 

<!-- this comment should not become the documentElement,
     if it does then the page will be blank -->
<html>
<body>
<script>
if (document.documentElement.nodeType == Node.ELEMENT_NODE)
    document.write("SUCCESS");
else
    document.write("FAIL");
</script>
</body>
</html>