Bug 1818287 - Part 2: Add tests for the propagation of focusin and focusout...

</form>

<script>

  let focusinPropagated = false;

  let focusoutPropagated = false;

  const form = document.querySelector("form");

  form.addEventListener("focusin", () => focusinPropagated = true);

  form.addEventListener("focusout", () => focusoutPropagated = true);

  test(() => {

    const element = document.querySelector("custom-control");

    element.focus();

    assert_true(element.eventFired, "Focus event fired on custom control");

    assert_true(focusinPropagated, "FocusIn event propagated through control");

    element.blur();

    assert_true(focusoutPropagated, "FocusOut event propagated through control");

  }, "Focus events fire on disabled form-associated custom elements with delegatesFocus");

</script>