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chromium/third_party/blink/web_tests/http/tests/misc/insert-iframe-into-xml-document-before-xsl-transform.html 

<body>
PASS if no crash.
<iframe id="i" src="resources/xml-with-xsl-transform.xml"></iframe>
<script>
if (window.testRunner)
  testRunner.dumpAsText();

setTimeout(function() {
  i.contentDocument.appendChild(document.createElement("iframe"));
}, 20);
</script>
</body>