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

<!DOCTYPE html>
<link rel=author href="mailto:[email protected]">
<link rel=author href="mailto:[email protected]">
<link rel=help href="https://html.spec.whatwg.org/multipage/interactive-elements.html#the-dialog-element">
<link rel=help href="https://bugs.chromium.org/p/chromium/issues/detail?id=304827">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<dialog>
  <form method="dialog">
    <input id="goodbye" type="submit" value="Goodbye">
    <input id="hello" type="submit" value="Hello">
  </form>
</dialog>

<script>
async_test(t => {
  const dialog = document.querySelector('dialog');
  dialog.show();
  dialog.addEventListener('close', t.step_func(() => {
    assert_false(dialog.open);
    assert_equals(dialog.returnValue, 'Goodbye');

    dialog.show();
    dialog.addEventListener('close', t.step_func_done(() => {
      assert_false(dialog.open);
      assert_equals(dialog.returnValue, 'Hello');
    }));
    document.querySelector('#hello').click();
  }), {once: true});

  document.querySelector('#goodbye').click();
}, 'Tests submitting a dialog on a close event triggered by a previous submission.');
</script>