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chromium/third_party/blink/web_tests/fast/forms/month/month-picker-appearance-disabled-today.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=month min="2018-06" value="2018-08" max="2018-10">

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