mutation-events-usecounter.html | Explore in Territory

<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>

<div id=target>foo</div>

<!-- This version is in the main repo, and tests that NO use counters fire. -->

<script>
test(() => {
  const target = document.getElementById('target');

  // This is all mutation event related use counters from web_feature.mojom:
  const allCounters = [143, 144, 145, 146, 147, 148,
      4885, 4886, 4887, 4888, 4889, 4890, 4891, 4892];

  // Trigger all mutation event types.
  target.remove();
  document.body.appendChild(target);
  target.setAttribute('foo','bar');
  target.removeAttribute('foo');
  target.firstChild.textContent = "bar";

  allCounters.forEach(counter => {
    assert_false(internals.isUseCounted(document, counter));
  });
}, 'Use of Mutation Events is NOT use-counted.');
</script>

chromium/third_party/blink/web_tests/fast/dom/mutation-events-usecounter.html