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chromium/third_party/blink/web_tests/external/wpt/html/semantics/interactive-elements/the-dialog-element/dialog-enabled.html 

<!DOCTYPE html>
<html>
<head>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<dialog></dialog>
<script>
test(function() {
  dialog = document.querySelector('dialog')
  assert_true(dialog instanceof HTMLDialogElement);
}, "The DIALOG element should be recognized");
</script>
</body>
</html>