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chromium/third_party/blink/web_tests/fast/forms/calendar-picker/date-picker-today-button.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="date" id="date" value="2019-02-14">
<script>

promise_test(() => {
  let dateElement = document.getElementById('date');
  return openPicker(dateElement)
  .then(() => {
    // Make the picker dismiss synchronously so we don't need to insert
    // an artificial delay in the test
    internals.pagePopupWindow.CalendarPicker.commitDelayMs = 0;

    clickTodayButton();

    let splitDate = dateElement.value.split('-');
    let actualTodayDateString = new Date(splitDate[0], splitDate[1] - 1, [splitDate[2]]).toDateString();
    let expectedTodayDateString = new Date().toDateString();

    assert_equals(actualTodayDateString, expectedTodayDateString, "Today button should have updated in-page control to today's date");
    assert_equals(internals.pagePopupWindow, null, "Click on Today button should close popup.");
  });
}, "Date picker: Today button should select today's date");

</script>