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chromium/third_party/blink/web_tests/external/wpt/css/css-counter-styles/counter-style-at-rule/access-from-shadow-dom.html 

<!DOCTYPE html>
<title>Counter styles defined in the document tree scope should be globally accessible</title>
<link rel="help" href="https://drafts.csswg.org/css-counter-styles-3/#the-counter-style-rule">
<link rel="help" href="https://drafts.csswg.org/css-scoping/#shadow-names">
<link rel="author" href="mailto:[email protected]">
<link rel="match" href="access-from-shadow-dom-ref.html">

<style>
@counter-style foo {
  system: fixed;
  symbols: A B C;
}
</style>

<div id="host"></div>

<script>
document.getElementById("host").attachShadow({mode: 'open'}).innerHTML = `
<ol style="list-style-type: foo; list-style-position: inside">
  <li></li>
  <li></li>
  <li></li>
</ol>
`
</script>