File: pseudo-element-implicit-anchor-center.html

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<!DOCTYPE html>
<title>CSS Anchor Positioning: Originating element implicit anchor for pseudo elements using anchor-center</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#implicit">
<link rel="match" href="/css/reference/ref-filled-green-100px-square-only.html">
<style>
  #anchor {
    display: flow-root;
    margin-left: -50px;
    margin-top: -50px;
    width: 200px;
    height: 200px;
  }
  #anchor::after {
    content: "";
    position: absolute;
    width: 100px;
    height: 100px;
    background: green;
    /* Should be centered inside #anchor */
    place-self: anchor-center;
  }
  #ref {
    margin-left: 50px;
    margin-top: 50px;
    width: 100px;
    height: 100px;
    background-color: red;
  }
</style>
<p>Test passes if there is a filled green square.</p>
<div id="wrapper">
  <div id="anchor">
    <div id="ref"></div>
  </div>
</div>