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chromium/third_party/blink/web_tests/fast/forms/color/color-suggestion-picker-with-scrollbar-appearance.html 

<!DOCTYPE html>
<meta name=fuzzy content="maxDifference=0-3; totalPixels=0-1000">
<script src="../../../resources/testdriver.js"></script>
<script src="../../../resources/testdriver-vendor.js"></script>
<script src="../resources/picker-common.js"></script>

<input type=color value="#ff0000" list=many focus>
<datalist id=many>
    <option>#000000</option>
    <option>#070707</option>
    <option>#0e0e0e</option>
    <option>#151515</option>
    <option>#1d1d1d</option>
    <option>#242424</option>
    <option>#2b2b2b</option>
    <option>#333333</option>
    <option>#3a3a3a</option>
    <option>#414141</option>
    <option>#484848</option>
    <option>#505050</option>
    <option>#575757</option>
    <option>#5e5e5e</option>
    <option>#666666</option>
    <option>#6d6d6d</option>
    <option>#747474</option>
    <option>#7b7b7b</option>
    <option>#838383</option>
    <option>#8a8a8a</option>
    <option>#919191</option>
    <option>#999999</option>
    <option>#a0a0a0</option>
    <option>#a7a7a7</option>
    <option>#aeaeae</option>
    <option>#b6b6b6</option>
    <option>#bdbdbd</option>
    <option>#c4c4c4</option>
    <option>#cccccc</option>
    <option>#d3d3d3</option>
    <option>#dadada</option>
    <option>#e1e1e1</option>
    <option>#e9e9e9</option>
    <option>#f0f0f0</option>
    <option>#f7f7f7</option>
    <option>#ffffff</option>
</datalist>

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