ript src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/util.js"></script>
<script>

promise_test(async () => {
  const watcher = new ScoreWatcher;

  // Wait for the initial render to complete.
  await waitForAnimationFrames(2);

  let scroller = document.querySelector("#s");
  let changer = document.querySelector("#ch");

  changer.style.top = "200px";
  scroller.scrollTop = 100;

  await waitForAnimationFrames(3);
  assert_equals(watch