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chromium/third_party/blink/web_tests/fast/forms/datetimelocal/datetimelocal-today-button.html 

<!DOCTYPE html>
<html>
<head>
<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>
</head>
<body>
<input type="datetime-local" id="datetime-local" value="2019-02-14T13:02">
<script>

promise_test(() => {
  let dateTimeElement = document.getElementById('datetime-local');
  return openPicker(dateTimeElement)
  .then(() => {
    clickTodayButton();

    let actualTodayDateString = new Date(dateTimeElement.value).toDateString();
    let expectedTodayDateString = new Date().toDateString();

    assert_equals(actualTodayDateString, expectedTodayDateString, "Today button should have updated in-page control to today's date");
    assert_not_equals(internals.pagePopupWindow, null, "Click on Today button should not close popup.");

    eventSender.keyDown('Escape');
    eventSender.keyDown('Escape');
    assert_equals(internals.pagePopupWindow, null, "Double-Escape should dismiss popup.");
  });
}, "Datetimelocal picker: Today button should select today's date");

</script>
</body>
</html>