File: pseudo-element-with-slotted-anchor.html

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<!DOCTYPE html>
<title>Slotted anchor with anchored pseudo-element</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#target-anchor-element">
<link rel="match" href="pseudo-element-with-slotted-anchor-ref.html">
<my-anchor>
  <template shadowrootmode="open">
    <style>
    :host {
      display: block;
    }

    ::slotted(*) {
      display: block;
      anchor-name: --anchor;
      padding: 2rem;
      background: red;
      color: white;
      inline-size: fit-content;
    }

    :host::after {
      content: 'target';
      position: absolute;
      position-anchor: --anchor;
      position-area: bottom center;
      background: lightblue;
      padding: 1rem;
    }
    </style>
    <slot></slot>
  </template>
  <span>anchor</span>
</my-anchor>