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chromium/third_party/blink/web_tests/fast/forms/color/color-suggestion-picker-appearance-two-rows.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='rainbow'>
<datalist id='rainbow'>
    <option>#ff0000</option>
    <option>#ffa500</option>
    <option>#ffff00</option>
    <option>#00ff00</option>
    <option>#0000ff</option>
    <option>#4b0082</option>
    <option>#ee82ee</option>
</datalist>

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