<!doctype html>
<meta charset="utf-8">
<title>CSS Test: scroll container with ::scroll-marker-group before between other blocks</title>
<link rel="match" href="scroll-marker-003-ref.html">
<link rel="help" href="https://drafts.csswg.org/css-overflow-5/#scroll-marker-pseudo">
<style>
  #scroller {
    width: 600px;
    height: 300px;
    overflow: scroll;
    scroll-marker-group: before;
  }

  #scroller div {
    width: 600px;
    height: 300px;
    margin-bottom: 20px;
    background: green;
  }

  #scroll