File: host-is-005.html

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<!doctype html>
<meta charset="utf-8">
<title>:host and :is() (with pseudos)</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<link rel="help" href="https://drafts.csswg.org/selectors/#featureless">
<link rel="match" href="/css/reference/ref-filled-green-100px-square-only.html">
<p>Test passes if there is a filled green square.</p>
<div id="host"></div>
<script>
  host.attachShadow({mode: "open"}).innerHTML = `
    <style>
      :is(:host)::before {
        display: block;
        content: "";
        width: 100px;
        height: 100px;
        background-color: green;
      }
    </style>
  `;
</script>