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chromium/third_party/blink/web_tests/external/wpt/css/css-anchor-position/anchor-inside-outside.html 

<!DOCTYPE html>
<title>CSS Anchor Positioning: anchor(inside/outside)</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#valdef-anchor-inside">
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#valdef-anchor-outside">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<style>
  #cb {
    position: relative;
    width: 400px;
    height: 400px;
    border: 1px solid black;
  }
  #anchor {
    position: absolute;
    top: 250px;
    left: 150px;
    background-color: skyblue;
    width: 50px;
    height: 50px;
    anchor-name: --a;
  }
  .target {
    position: absolute;
    position-anchor: --a;
    background-color: tomato;
    width: 10px;
    height: 10px;
  }
</style>
<div id=cb>
  <div id=anchor></div>
  <div class=target style="left:anchor(inside)" data-offset-x=150></div>
  <div class=target style="left:anchor(outside)" data-offset-x=200></div>
  <div class=target style="right:anchor(inside)" data-offset-x=190></div>
  <div class=target style="right:anchor(outside)" data-offset-x=140></div>
  <div class=target style="top:anchor(inside)" data-offset-y=250></div>
  <div class=target style="top:anchor(outside)" data-offset-y=300></div>
  <div class=target style="bottom:anchor(inside)" data-offset-y=290></div>
  <div class=target style="bottom:anchor(outside)" data-offset-y=240></div>
  <!-- Logical -->
  <div class=target style="inset-inline-start:anchor(inside)" data-offset-x=150></div>
  <div class=target style="inset-inline-start:anchor(outside)" data-offset-x=200></div>
  <div class=target style="inset-inline-end:anchor(inside)" data-offset-x=190></div>
  <div class=target style="inset-inline-end:anchor(outside)" data-offset-x=140></div>
  <div class=target style="inset-block-start:anchor(inside)" data-offset-y=250></div>
  <div class=target style="inset-block-start:anchor(outside)" data-offset-y=300></div>
  <div class=target style="inset-block-end:anchor(inside)" data-offset-y=290></div>
  <div class=target style="inset-block-end:anchor(outside)" data-offset-y=240></div>
</div>
<script>
  addEventListener('load', () => checkLayout('.target'));
</script>