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chromium/third_party/blink/web_tests/fast/forms/time/time-picker-click.html 

<!DOCTYPE html>
<meta name=fuzzy content="maxDifference=0-3; totalPixels=0-1000">
<p>The test passes if when you click on the number 12 below it gets highlighted.</p>
<input type="time" id="time" value="12:00">
<script>
  if (window.testRunner) {
    testRunner.waitUntilDone();

    eventSender.mouseMoveTo(time.offsetLeft + 10, time.offsetTop + 10);
    eventSender.mouseDown();
    eventSender.mouseUp();

    testRunner.notifyDone();
  }
</script>