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chromium/third_party/blink/web_tests/external/wpt/css/css-position/overlay/overlay-transition-dialog.html 

<!DOCTYPE html>
<html class=reftest-wait>
<link rel=author href="mailto:[email protected]">
<link rel=help href="https://drafts.csswg.org/css-position-4/#overlay">
<link rel=help href="https://bugs.chromium.org/p/chromium/issues/detail?id=1451910">
<link rel=help href="https://github.com/whatwg/html/pull/9387">
<link rel=match href="overlay-transition-dialog-ref.html">

<dialog>dialog</dialog>

<style>
dialog.animate {
  transition: overlay 2s allow-discrete, display 2s allow-discrete;
}
</style>

<script>
const dialog = document.querySelector('dialog');
dialog.showModal();
dialog.classList.add('animate');
dialog.close();
requestAnimationFrame(() => {
  requestAnimationFrame(() => {
    document.documentElement.classList.remove('reftest-wait');
  });
});
</script>