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chromium/third_party/blink/web_tests/fast/parser/body-should-exist-after-open-close.html 

<body>
<iframe></iframe>
<script>
if (window.testRunner)
    testRunner.dumpAsText();

var doc = frames[0].document;
doc.open();
doc.close();
document.write(doc.body.toString() == "[object HTMLBodyElement]" ? "PASS" : "FAIL");
</script>