update-callback-timeout.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /css/css-view-transitions/update-callback-timeout.html - WPT Dashboard Interop Dashboard

<!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>