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chromium/third_party/blink/web_tests/external/wpt/css/css-anchor-position/reference/anchor-position-circular-ref.html 

<!DOCTYPE html>
<style>
div {
  width: 100px;
  height: 100px;
}

#anchored1 {
  position: absolute;
  left: 0;
  top: 0;
  background: orange;
}

#anchored2 {
  position: absolute;
  left: 0;
  top: 100px;
  background: green;
}
</style>

<div id="anchored1"></div>
<div id="anchored2"></div>