<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Test: scroll tracking for ::scroll-marker with overflow: hidden</title>
<link rel="help" href="https://drafts.csswg.org/css-overflow-5/#scroll-container-scroll">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/css-transitions/support/helper.js"></script>
<style>
  #scroller {
    overflow: scroll;
    scroll-marker-group: before;
    height: 100px;
  }

  #scroller::scroll-marker-gro