File: scroll-marker-group-add-dynamic-001.html

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<!DOCTYPE html>
<title>CSS Overflow Test: Dynamically change a ::scroll-marker-group</title>
<link rel="help" href="https://drafts.csswg.org/css-overflow-5/#scroll-marker-group-pseudo">
<link rel="match" href="scroll-marker-group-add-dynamic-001-ref.html">
<style>
  #scroller {
    scroll-marker-group: before;
    overflow: auto;
    width: 200px;
    height: 200px;
  }

  #item::scroll-marker {
    content: "PASS"
  }

  #scroller::scroll-marker-group {
    display: flex;
  }

  #scroller.group::scroll-marker-group {
    display: block;
    height: 100px;
  }
</style>
<p>Test passes if there is the word "PASS" below.</p>
<div id="scroller">
  <div id="item"></div>
</div>
<script>
  scroller.offsetTop;
  scroller.className = "group";
</script>