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chromium/third_party/blink/web_tests/fast/forms/calendar-picker/month-picker-hotkeys.html 

<!DOCTYPE html>
<meta name=fuzzy content="maxDifference=0-3; totalPixels=0-1000">
<script src="../../../resources/testharness.js"></script>
<script src="../../../resources/testharnessreport.js"></script>
<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="../calendar-picker/resources/calendar-picker-common.js"></script>

<input type="month" id="month-0" value="2018-06">
<script>

promise_test(() => {
  let monthElement = document.getElementById('month-0');
  return openPicker(monthElement)
  .then(() => {
    eventSender.keyDown('Home');
    assert_equals(monthElement.value, "2018-01", "Home hotkey should go to the first of the year");

    eventSender.keyDown('Home');
    assert_equals(monthElement.value, "2017-01", "Home hotkey should go to the previous year");

    eventSender.keyDown('End');
    assert_equals(monthElement.value, "2017-12", "End hotkey should go to the end of the year");

    eventSender.keyDown('End');
    assert_equals(monthElement.value, "2018-12", "End hotkey should go to the next year");

    eventSender.keyDown('Enter');
    assert_equals(internals.pagePopupWindow, null, "Enter key should have closed popup.");
  });
}, "Month picker: Home/end month hotkeys");

</script>