File: select-initial-focus-display-animation.html

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<!DOCTYPE html>
<link rel=author href="mailto:jarhar@chromium.org">
<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="/resources/testdriver-actions.js"></script>

<select>
  <option>option</option>
</select>

<style>
select, ::picker(select) {
  appearance: base-select;
}

::picker(select) {
  transition: display allow-discrete 1s, opacity 1s;
}

select:not(:open)::picker(select) {
  opacity: 0;
}
</style>

<script>
const select = document.querySelector('select');
const option = document.querySelector('option');
promise_test(async () => {
  await test_driver.click(select);
  await new Promise(requestAnimationFrame);
  await new Promise(requestAnimationFrame);
  assert_equals(document.activeElement, option);
}, 'Option initial focus should still work when a display animation is present.');
</script>