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chromium/third_party/blink/web_tests/fast/forms/color-scheme/month-picker/month-picker-appearance.html 

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

<input type=month value="2018-08">

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