File: anchor-scroll-update-006-ref.html

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<!DOCTYPE html>
<style>
  #cb {
    position: absolute;
    inset: 0;
  }
  #scroller {
    margin-top: 300px;
    overflow-y: scroll;
    height: 100px;
  }
  #spacer { height: 300px; }
  #anchor { anchor-name: --a; }
  #anchored {
    position: absolute;
    width: 100px;
    height: 100px;
    background-color: green;
    top: 100px;
    left: 0;
  }
</style>
<div id="cb">
  <div id="scroller">
    <div id="anchor"></div>
    <div id="spacer"></div>
  </div>
  <div id="anchored"></div>
</div>
<script>
const scroller = document.getElementById('scroller');
scroller.scrollTop = 200;
</script>