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chromium/third_party/blink/web_tests/external/wpt/xhr/responsexml-invalid-type.html 

<!doctype html>
<html>
<head>
<title>XMLHttpRequest: response with an invalid responseXML document</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<script>
promise_test(async () => {
  var xhr = new XMLHttpRequest();
  xhr.responseType = "document";
  xhr.open("GET", "resources/top.txt");
  xhr.send();
  await new Promise(r => xhr.onreadystatechange = () => { if (xhr.readyState == xhr.DONE) r(); });
  assert_equals(xhr.responseXML, null);
  assert_equals(xhr.response, null);
});
</script>
</body>
</html>