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chromium/third_party/blink/web_tests/fast/forms/select-popup/popup-menu-different-font-indentation.html 

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

<select>
  <optgroup label="Standard fonts">
    <option style="font-family: serif;">Serif</option>
    <option selected style="font-family: sans-serif;">Sans serif</option>
    <option style="font-family: monospace;">Monospace</option>
  </optgroup>
  <optgroup label="Script fonts">
    <option style="font-family: cursive;">Cursive</option>
    <option style="font-family: fantasy;">Fantasy</option>
  </optgroup>
  <option style="font-family: system-ui;">System UI</option>
</select>

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