state-restore-before-pageshow-frame.html

<!DOCTYPE html>
<body>
<script>
window.addEventListener('pageshow', e => {
  if (parent.promiseResolver)
    parent.promiseResolver(document.querySelector('select').value);
});
</script>
<select>
<option selected>o1</option>
<option>o2</option>
</select>
</body>

chromium/third_party/blink/web_tests/fast/forms/resources/state-restore-before-pageshow-frame.html