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chromium/third_party/blink/web_tests/external/wpt/dom/nodes/Document-contentType/contentType/createDocument.html 

<!DOCTYPE html>
<title>document.implementation.createDocument: document.contentType === 'application/xhtml+xml'</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id=log></div>
<script>
test(function() {
  var doc = document.implementation.createDocument("http://www.w3.org/1999/xhtml", "html", null);
  assert_equals(doc.contentType, "application/xhtml+xml");
});
</script>