switch-picker-appearance-timing.tentative.html

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This test has a WPT meta file that expects 2 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/semantics/forms/the-select-element/customizable-select/switch-picker-appearance-timing.tentative.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<link rel=help href="https://github.com/whatwg/html/issues/13027">

<link rel=help href="https://html.spec.whatwg.org/multipage/webappapis.html#update-the-rendering">

<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="../../../popovers/resources/popover-utils.js"></script>

<style>

select, select::picker(select) {

  appearance: base-select;

.autoPicker::picker(select) {

  appearance: auto;

</style>

<select id=selectAppearance>

  <option>one</option>

  <option>two</option>

</select>

<select id=pickerAppearance>

  <option>one</option>

  <option>two</option>

</select>

<script>

promise_test(async t => {

  const select = selectAppearance;

  t.add_cleanup(() => select.remove());

  await test_driver.click(select);

  assert_true(select.matches(':open'), 'Select should be open after clicking it.');

  select.style.appearance = 'auto';

  assert_equals(getComputedStyle(select).appearance, 'auto');

  assert_true(select.matches(':open'), 'Computing style should not close the picker.');

  await waitForRender();

  assert_false(select.matches(':open'), 'The picker should be closed after a rendering update.');

}, 'A picker whose select stops having base appearance closes when the rendering is updated, not when style is computed.');

promise_test(async t => {

  const select = pickerAppearance;

  t.add_cleanup(() => select.remove());

  await test_driver.click(select);

  assert_true(select.matches(':open'), 'Select should be open after clicking it.');

  select.classList.add('autoPicker');

  assert_equals(getComputedStyle(select, '::picker(select)').appearance, 'auto');

  assert_true(select.matches(':open'), 'Computing style should not close the picker.');

  await waitForRender();

  assert_false(select.matches(':open'), 'The picker should be closed after a rendering update.');

}, 'A picker that stops having base appearance closes when the rendering is updated, not when style is computed.');

</script>