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chromium/third_party/blink/web_tests/external/wpt/css/css-anchor-position/anchor-scroll-position-try-012-ref.html 

<!DOCTYPE html>
<style>
#scroller {
  width: 400px;
  height: 400px;
  overflow-y: scroll;
}

.box {
  min-height: 100px;
  width: 100px;
}

#anchor {
  background: orange;
}

#anchored {
  width: 100px;
  height: 100px;
  background: green;
}
</style>

<div id="scroller">
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box" id="anchor"></div>
  <div id="anchored"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
</div>

<script>
scroller.scrollTop = 150;
</script>