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chromium/third_party/blink/web_tests/fast/forms/validation-bubble-blur.html 

<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<input required>
<script>
async_test(t => {
  let input = document.querySelector('input');
  assert_own_property(window, 'internals');
  input.reportValidity();
  assert_true(internals.isValidationMessageVisible(input));
  assert_equals(document.activeElement, input);

  input.blur();
  requestAnimationFrame(t.step_func_done(() => {
    assert_false(internals.isValidationMessageVisible(input));
  }));
}, 'Ensure that removing focus from an invalid control with ' +
    'a validation bubble closes the validation bubble.');
</script>