position-visibility-anchors-visible-change-css-visibility-ref.html

<!DOCTYPE html>
<meta charset="utf-8">
<style>
  #anchor {
    width: 100px;
    height: 100px;
    background: orange;
  }
  #target {
    width: 100px;
    height: 100px;
    background: green;
  }
</style>
<div id="anchor">anchor</div>
<div id="target">target</div>

chromium/third_party/blink/web_tests/external/wpt/css/css-anchor-position/position-visibility-anchors-visible-change-css-visibility-ref.html