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chromium/third_party/blink/web_tests/external/wpt/html/semantics/popovers/popover-change-type.html 

<!DOCTYPE html>
<link rel=author href="mailto:[email protected]">
<link rel=help href="https://github.com/whatwg/html/issues/9034">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/html/semantics/popovers/resources/popover-utils.js"></script>

<div id=mypopover>popover</div>

<script>
promise_test(async () => {
  const mypopover = document.getElementById('mypopover');

  mypopover.popover = "manual";
  mypopover.showPopover();

  await new Promise(resolve => {
    mypopover.addEventListener("beforetoggle", (e) => {
      if (e.newState === "closed") {
        mypopover.remove();
        requestAnimationFrame(() => {
          document.body.append(mypopover);
          mypopover.showPopover();
          resolve();
        });
      }
    }, {once: true});

    mypopover.popover = "auto";
  });

  assert_true(mypopover.matches(':popover-open'),
    'The popover should be open after the toggling sequence.');

  await sendEscape();
  assert_false(mypopover.matches(':popover-open'),
    'The popover should light dismiss because it is in the auto state.');
}, 'Changing the popover attribute should always update the auto/manual behavior.');
</script>