File: shift-with-counterscroll.html

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<!DOCTYPE html>
<title>Layout Instability: shift with counterscroll not counted</title>
<link rel="help" href="https://wicg.github.io/layout-instability/" />
<style>

#s {
  overflow: scroll;
  position: absolute;
  left: 20px;
  top: 20px;
  width: 200px;
  height: 200px;
}
#sp {
  width: 170px;
  height: 600px;
}
#ch {
  position: relative;
  background: yellow;
  left: 10px;
  top: 100px;
  width: 150px;
  height: 150px;
}

</style>
<div id="s">
  <div id="sp">
    <div id="ch"></div>
  </div>
</div>
<script 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(watcher.score, 0);
}, "Shift with counterscroll not counted.");

</script>