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chromium/third_party/blink/web_tests/http/tests/misc/favicon-link-in-detached-frame.html 

<body>
<link rel="icon stylesheet" href="foo"></link>
<iframe id="i"></iframe>
<script>
if (window.testRunner)
  testRunner.dumpAsText();
i.contentDocument.documentElement.appendChild(document.body);
console.log("PASS if no crash.");
</script>