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chromium/third_party/blink/web_tests/fast/hidpi/static/popup-menu-appearance.html 

<!DOCTYPE html>
<script src="../../../resources/testdriver.js"></script>
<script src="../../../resources/testdriver-vendor.js"></script>
<script src="../../forms/resources/picker-common.js"></script>

<p>The font size in the popup should be same as the font size of the SELECT element except the third OPTION.</p>
<select>
  <option>foo</option>
  <option selected>bar</option>
  <option hidden>qux</option>
  <option>baz</option>
  <optgroup label="Group">
    <option>foo</option>
    <option>bar</option>
  </optgroup>
</select>

<script>
  window.onload = openPickerAppearanceOnly(document.querySelector('select'));
</script>