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chromium/third_party/blink/web_tests/external/wpt/dom/nodes/Document-createElement-namespace-tests/xhtml_ns_changed.html 

<html xmlns="http://www.w3.org/1999/xhtml">
  <head><script>
    var newRoot = document.createElementNS("http://www.w3.org/2000/svg", "abc");
    document.removeChild(document.documentElement);
    document.appendChild(newRoot);
  </script></head>
</html>