date-picker-month-year-selector.html

<!DOCTYPE html>
<meta name="color-scheme" content="dark">
<script src="../../../resources/testdriver.js"></script>
<script src="../../../resources/testdriver-vendor.js"></script>
<script src="../../../fast/forms/resources/common.js"></script>
<script src="../../../fast/forms/resources/picker-common.js"></script>
<script
  src="../../../fast/forms/calendar-picker/resources/calendar-picker-common.js"></script>

<input type=date value="2019-07-31">
<script>
  openPickerAppearanceOnly(document.querySelector('input'), () => {
    clickMonthPopupButton();
    skipAnimation();
  });
</script>

chromium/third_party/blink/web_tests/virtual/dark-color-scheme/date/date-picker-month-year-selector.html