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chromium/third_party/blink/web_tests/external/wpt/css/css-view-transitions/view-transition-types-mutable.html 

<!DOCTYPE html>
<title>View behavior of ViewTransitionTypeSet</title>
<link rel="help" href="https://www.w3.org/TR/css-transitions-2/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>

    test(() => {
    assert_implements(document.startViewTransition);
    const { types } = document.startViewTransition();
    assert_true(types instanceof ViewTransitionTypeSet);
  }, "ViewTransition.types is a ViewTransitionTypeSet");

  test(() => {
    assert_implements(document.startViewTransition);
    const { types } = document.startViewTransition();
    types.add("a");
    types.add("b");
    assert_array_equals([...types], ["a", "b"]);
    assert_array_equals(Array.from(types), ["a", "b"]);
    types.delete("b");
    assert_array_equals([...types], ["a"]);
    assert_true(types.has("a"));
    types.add("a");
    assert_array_equals([...types], ["a"]);
    types.add(".");
    types.add("");
    types.add("123");
    assert_array_equals([...types], ["a", ".", "", "123"]);
  }, "ViewTransitionTypeSet behaves like an ordinary Set of strings");

  promise_test(async () => {
    assert_implements(document.startViewTransition);
    const transition = document.startViewTransition();
    transition.types.add("a");
    await transition.finished;
    assert_array_equals([...transition.types], ["a"]);
    transition.types.add("b");
    assert_array_equals([...transition.types], ["a", "b"]);
  }, "ViewTransitionTypeSet should reflect its members for a non-active transition");
</script>

</html>