inert-while-transitioning-to-display-none.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-transitions/inert-while-transitioning-to-display-none.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<link rel=author href="mailto:jarhar@chromium.org">

<link rel=help href="https://github.com/w3c/csswg-drafts/issues/8389">

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

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

<dialog>

  <button>button</button>

</dialog>

<style>

dialog.ready {

  transition: display 500ms;

</style>

<script>

promise_test(async () => {

  const dialog = document.querySelector('dialog');

  const button = document.querySelector('button');

  dialog.showModal();

  button.blur(); // Dialog initial focus focused the button

  dialog.classList.add('ready');

  dialog.close();

  await new Promise(resolve => requestAnimationFrame(resolve));

  button.focus();

  assert_not_equals(document.activeElement, button, 'Inert elements should not be focusable.');

}, 'Elements which are transitioning to display:none should be inert.');

</script>