File: pagereveal-updatecallbackdone-promise.html

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<!DOCTYPE html>
<title>
  View transitions: Test pagereveal.updateCallbackDone promise is immediately resolved.
</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-2/">
<link rel="author" href="mailto:bokan@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
@view-transition {
  navigation: auto;
}
</style>
<script>
const params = new URLSearchParams(location.search);

// Ensures microtasks in the current event loop are flushed before control flow
// resumes.
function flushMicrotasks() {
  return new Promise(resolve => resolve());
}

switch (params.get("mode") || "test") {
case "test":
  promise_test(async t => {
    await new Promise(resolve => {
      window.did_finish_callback = resolve;
      const popup = window.open("?mode=old");
      t.add_cleanup(() => popup.close());
    });
  });
  break;
case "old":
  onload = () => requestAnimationFrame(() => requestAnimationFrame(() => {
      location.replace('?mode=new');
  }));
  break;
case "new":
  onpagereveal = e => {
    e.viewTransition.updateCallbackDone.then(() => {
      window.opener.did_finish_callback();
    });
  }
  break;
}
</script>