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chromium/third_party/blink/web_tests/fast/media/HTMLMediaElement-construction-in-detached-document.html 

<body>
PASS if creating an audio element in a detached Document doesn't crash.
<iframe id="i"></iframe>
<script>
if (window.testRunner)
  testRunner.dumpAsText();

var child_document = i.contentDocument;
i.remove();
var audio = child_document.createElement("audio");
</script>
</body>