root-scrollbar-with-fixed-background-ref.html

<!DOCTYPE html>
<html class="reftest-wait">
<title>View transitions: capture root element with scrollbar (ref)</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:[email protected]">

<style>
#container {
  background: lightblue;
}
#first {
  width: 10px;
  background: linear-gradient(green, blue);
  height: 1000px;
}
body {
  margin: 0px;
  padding: 0px;
  filter: invert(1);
}
</style>

  <div id=container>
    <div id=first></div>
  </div>

<script>
  function scrollContainer() {
    addEventListener("scroll", () => {
      requestAnimationFrame(() => {
        requestAnimationFrame(() => {
          document.documentElement.classList.remove("reftest-wait");
        });
      });
    }, { once: true, capture: true });
    document.documentElement.scrollTop = 500;
  }

  onload = scrollContainer();
</script>
</html>

chromium/third_party/blink/web_tests/external/wpt/css/css-view-transitions/root-scrollbar-with-fixed-background-ref.html