chromium/src/third_party/blink/web_tests/http/tests/navigation/fragment-change-does-not-cancel-pending-navigation.html

<a href="#" id="anchor"></a>
<span id="result">FAIL - did not navigate to ...?done</span>

<script>
if (window.location.href.indexOf('?') !== -1) {
  document.getElementById('result').textContent = 'PASS - navigated to ...?done';
  if (window.testRunner)
    testRunner.notifyDone();
} else {
  if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.waitUntilDone();
  }

  document.getElementById('anchor').addEventListener('click', () => {
    // Next line should schedule a navigation.
    location.assign(location.href + '?done');
    // Default handler should perform fragment scroll
    // and not cancel scheduled navigation.
  });

  window.onload = () => {
    setTimeout(() => {
      document.getElementById('anchor').click();
    }, 0);
  };
}
</script>