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chromium/third_party/blink/web_tests/fast/forms/time-multiple-fields/time-includes-seconds.html 

<!DOCTYPE html>
<link rel="author" title="Joey Arhar" href="mailto:[email protected]">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1182180">

<script src="../../../resources/testharness.js"></script>
<script src="../../../resources/testharnessreport.js"></script>

<input type=time step=1 id=secondstep value="12:34:56">
<input type=time step="0.001" id=msstep value="12:34:56.789">

<script>
test(() => {
  secondstep.focus();
  eventSender.keyDown('ArrowRight');
  eventSender.keyDown('ArrowRight');
  eventSender.keyDown('0');
  assert_equals(secondstep.value, '12:34:00');
}, `<input type=time> should always include seconds in .value if the seconds portion is visible.`);

test(() => {
  msstep.focus();
  eventSender.keyDown('ArrowRight');
  eventSender.keyDown('ArrowRight');
  eventSender.keyDown('ArrowRight');
  eventSender.keyDown('0');
  assert_equals(msstep.value, '12:34:56.000');
}, `<input type=time> should always include milliseconds in .value if the milliseconds portion is visible.`);
</script>