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chromium/third_party/blink/web_tests/fast/forms/button/invalid-type-usecounter.html 

<!DOCTYPE html>
<link rel=author href="mailto:[email protected]">
<link rel=help href="https://github.com/whatwg/html/issues/10462">
<script src="../../../resources/testharness.js"></script>
<script src="../../../resources/testharnessreport.js"></script>

<button>button</button>

<script>
const invalidValueCounterId = 5032;
const emptyValueCounterId = 5033;
test(() => {
  assert_false(internals.isUseCounted(document, invalidValueCounterId),
    'Invalid value UseCounter should initially not be counted.');
  assert_false(internals.isUseCounted(document, emptyValueCounterId),
    'Empty value UseCounter should initially not be counted.');

  const button = document.querySelector('button');
  button.setAttribute('type', 'submit');

  assert_false(internals.isUseCounted(document, invalidValueCounterId),
    'Invalid value UseCounter should not be counted for type=submit.');
  assert_false(internals.isUseCounted(document, emptyValueCounterId),
    'Empty value UseCounter should not be counted for type=submit.');

  button.setAttribute('type', 'foo');

  assert_true(internals.isUseCounted(document, invalidValueCounterId),
    'Invalid value UseCounter should be counted for type=foo.');
  assert_false(internals.isUseCounted(document, emptyValueCounterId),
    'Empty value UseCounter should not be counted for type=foo.');

  button.setAttribute('type', '');

  assert_true(internals.isUseCounted(document, emptyValueCounterId),
    'Empty value UseCounter should be counted for type="".');
}, 'Tests for UseCounters for button type attribute values.');
</script>