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<!DOCTYPE html>
<title>CSS Test Reference: ::scroll-marker dynamic creation and removal</title>
<style>
  #scroller {
    width: 600px;
    height: 300px;
    overflow: scroll;
  }
  #scroller div {
    width: 600px;
    height: 300px;
    margin-bottom: 20px;
    background: green;
  }
  #scroll-marker-group {
    border: 3px solid black;
    padding: 5px;
    height: 20px;
    display: block;
  }
  #scroll-marker {
    width: 10px;
    height: 10px;
    background-color: aqua;
    border-radius: 100%;
    display: inline-block;
  }
</style>
<div id="scroller">
  <div></div>
</div>
<div id="scroll-marker-group">
  <div id="scroll-marker"></div>
</div>