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chromium/third_party/blink/web_tests/fast/xsl/xsl-external-load-detached.html 

<body>
PASS if no crash.
<iframe src="resources/doctype.html" id="i"></iframe>
<script>
if (window.testRunner)
  testRunner.dumpAsText();

window.onload = () => {
  let i_doc = i.contentDocument;
  i.remove();
  var x = new XSLTProcessor();
  var xsl = new DOMParser().parseFromString('<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"></xsl:stylesheet>','application/xml');
  x.importStylesheet(xsl);
  x.transformToDocument(i_doc);
}</script>