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chromium/third_party/blink/web_tests/wpt_internal/css/css-overflow/scroll-marker-008.html 

<!DOCTYPE html>
<title>Scroll marker group with out-of-flow children</title>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-overflow-5/#scroll-marker-group">
<link rel="help" href="https://github.com/flackr/carousel/issues/31">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<style>
  #scroller {
    overflow: hidden;
    scroll-marker-group: after;
  }
  #scroller::scroll-marker-group {
    contain: none; /* It should be impossible to disable layout containment for scroll marker groups, so this declaration should have no effect. */
    display: block;
    width: 100px;
    height: 100px;
    background: red;
  }
  #scroller > *::scroll-marker {
    display: block;
    position: absolute;
    right: 0;
    top: 0;
    width: 100px;
    height: 100px;
    content: "";
    background: green;
  }
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div id="scroller">
  <div></div>
</div>