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chromium/third_party/blink/web_tests/fast/forms/select-popup/popup-menu-appearance-zoom090.html 

<!DOCTYPE html>
<meta name=fuzzy content="maxDifference=0-3; totalPixels=0-100">
<script src="../../../resources/testdriver.js"></script>
<script src="../../../resources/testdriver-vendor.js"></script>
<script src="../resources/picker-common.js"></script>

<body style="zoom:0.9;">
<p>The bottom border of the popup should be visible in 90% zoom level.</p>
<select>
  <option>foo</option>
  <option selected>bar</option>
  <option hidden>qux</option>
  <option style="zoom:1.5;">baz</option>
  <optgroup label="Group">
    <option>foo</option>
    <option>bar</option>
  </optgroup>
</select>

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