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<!DOCTYPE html>
<html class="reftest-wait reftest-no-flush">
<style>
#outer {
  position: absolute;
  overflow: scroll;
  width: 50vw;
  height: 90vh;
  border: 1px solid black;
  scrollbar-width: none;
}
#inner {
  overflow-y: hidden;
  width: 100%;
}
.spacer {
  width: 60vw;
  height: 5000px;
  background-color: blue;
}
</style>
<div id="outer">
  <div id="inner">
    <div class="spacer"></div>
  </div>
</div>
<script>
document.addEventListener('MozReftestInvalidate', async () => {
  outer.style.width = "90vw";
  await new Promise(resolve => requestAnimationFrame(resolve));
  await new Promise(resolve => requestAnimationFrame(resolve));

  const scrollEndPromise = new Promise(resolve => outer.addEventListener("scrollend", resolve));
  outer.scrollBy({ top: 5000, behavior: "smooth" });
  await scrollEndPromise;

  document.documentElement.classList.remove('reftest-wait');
}, false);
</script>
</html>