date-picker-month-selection-changed-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/common.js"></script>
<script src="../resources/picker-common.js"></script>
<script src="resources/calendar-picker-common.js"></script>

<input type="date" value="10000-08-15">

<script>
  window.onload = openPickerAppearanceOnly(document.querySelector('input'),() => {
    // Change the month a couple of times in the month picker menu.
    // Ensure that only the current month is highlighted when
    // the month picker menu is reopened.

    clickMonthPopupButton();
    eventSender.keyDown('ArrowRight');
    eventSender.keyDown('Enter');

    clickMonthPopupButton();
    eventSender.keyDown('ArrowRight');
    eventSender.keyDown('Enter');

    clickMonthPopupButton();
});
</script>

chromium/third_party/blink/web_tests/fast/forms/calendar-picker/date-picker-month-selection-changed-appearance.html