File: update-callback-timeout.html

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<!DOCTYPE html>
<html>
  <title>View transitions: Transition has implementation-defined timeout.</title>
  <link rel="author" title="Tim Nguyen" href="https://github.com/nt1m">
  <link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
  <meta name="timeout" content="long">
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
  <script>
    promise_test(async t => {
      assert_implements(document.startViewTransition, "Missing document.startViewTransition");
      const transition = document.startViewTransition(() => {
        return new Promise(() => {});
      });
      transition.updateCallbackDone.then(() => {
        assert_unreached();
      });
      transition.finished.then(() => {
        assert_unreached();
      });
      await promise_rejects_dom(t, "TimeoutError", transition.ready);
    }, "View transition should have an implementation-defined timeout on the update callback");
</script>
</body>
</html>