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chromium/third_party/blink/web_tests/external/wpt/html/dom/documents/dom-tree-accessors/document.head-02.html 

<!DOCTYPE html>
<title>document.head</title>
<link rel="author" title="Ms2ger" href="mailto:[email protected]">
<link rel="help" href="https://html.spec.whatwg.org/multipage/#dom-document-head">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
var HTML = "http://www.w3.org/1999/xhtml";
test(function() {
  var head = document.getElementsByTagName("head")[0];
  assert_equals(document.head, head);
  var head2 = document.createElementNS(HTML, "blah:head");
  document.documentElement.insertBefore(head2, head);
  assert_equals(document.head, head2);
  var head3 = document.createElementNS("http://www.example.org/", "blah:head");
  document.documentElement.insertBefore(head3, head2);
  assert_equals(document.head, head2);
});
</script>