popup-menu-appearance-minimum-font.html

<!DOCTYPE html>
<meta name=fuzzy content="maxDifference=0-3; totalPixels=0-100">
<script>
  if (window.testRunner)
    testRunner.overridePreference('WebKitMinimumFontSize', '12');
</script>
</script><script src="../../../resources/testdriver.js"></script>
<script src="../../../resources/testdriver-vendor.js"></script>
<script src="../resources/picker-common.js"></script>

<style>
  select, span {
      font-size: 6px;
  }
</style>
<select>
  <option>foo</option>
  <optgroup label="group" id="group">
      <option selected>bar</option>
  </optgroup>
  <option>baz</option>
</select>
<span>The font size in the popup content should be 12px, which is the same as this text.</span>

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

chromium/third_party/blink/web_tests/fast/forms/select-popup/popup-menu-appearance-minimum-font.html