File: host-nesting-001.html

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<!doctype html>
<meta charset="utf-8">
<title>:host and nesting (basic) </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/css-nesting/#nest-selector">
<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>
      :host {
        .nested {
          width: 100px;
          height: 100px;
          background-color: green;
        }
      }
    </style>
    <div class="nested"></div>
  `;
</script>