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chromium/third_party/blink/web_tests/external/wpt/html/semantics/popovers/popover-anchor-scroll-display-ref.html 

<!DOCTYPE html>
<meta charset="utf-8">

<div class=spacer style="height: 200px"></div>

<p>There should be a green box attached to the right side of each orange box.</p>
<div class=ex id=ex1><div class=anchor></div><div class=popover></div></div>
<div class=ex id=ex2><div class=anchor></div><div class=popover></div></div>

<div class=spacer style="height: 200vh"></div>

<style>
  .ex {
    margin: 25px;
    font-size: 0;
  }
  .ex div {
    display:inline-block;
    width: 100px;
    height: 100px;
  }
  .anchor {
    background: orange;
  }
  .popover {
    background: lime;
  }
</style>

<script>
document.documentElement.scrollTop = 100;
</script>