position-visibility-no-overflow-scroll-ref.html

<!DOCTYPE html>
<style>
  #scroll-container {
    overflow: hidden scroll;
    width: 400px;
    height: 150px;
  }

  .anchor {
    width: 100px;
    height: 100px;
    background: orange;
    display: inline-block;
  }

  .target {
    width: 100px;
    height: 100px;
  }
</style>

<div id="scroll-container">
  <div class="anchor">anchor1</div>
  <div class="anchor" style="position: relative; top: 100px">anchor2</div>
  <div id="target1" class="target" style="background: green">target1</div>
  <div style="height: 200px"></div>
</div>
<script>
document.getElementById('scroll-container').scrollTop = 50;
</script>

chromium/third_party/blink/web_tests/external/wpt/css/css-anchor-position/position-visibility-no-overflow-scroll-ref.html