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chromium/third_party/blink/web_tests/wpt_internal/html/semantics/forms/the-select-element/stylable-select/select-appearance-switching-invalidation.tentative.html 

<!DOCTYPE html>
<html class=reftest-wait>
<link rel=author href="mailto:[email protected]">
<link rel=help href="https://github.com/whatwg/html/issues/9799">
<link rel=match href="select-appearance-switching-invalidation-ref.html">
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>

<style>
.blue {
  color: blue;
}
</style>

<select>
  <button>button</button>
  <option>
    <span class=blue>option</span> one
  </option>
  <option>
    <span class=blue>option</span> two
  </option>
</select>

<script>
requestAnimationFrame(async () => {
  await test_driver.bless();
  const select = document.querySelector('select');
  select.style = 'appearance:base-select';
  select.showPicker();
  document.documentElement.classList.remove('reftest-wait');
});
</script>