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

<!DOCTYPE html>
<title>Counter style references are tree-scoped, the same name may dereference to different rules</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="fallbacks-in-shadow-dom-ref.html">

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

@counter-style bar {
  system: fixed 4;
  symbols: D E F;
  fallback: foo;
}
</style>

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

<script>
document.getElementById("host").attachShadow({mode: 'open'}).innerHTML = `
<style>
@counter-style foo {
  system: cyclic;
  symbols: X Y Z;
}

@counter-style baz {
  system: fixed 4;
  symbols: G H I;
  fallback: foo;
}
</style>

<ol style="list-style-type: bar; list-style-position: inside">
  <div>This list style should fallback to 'foo' in the parent tree scope</div>
  <li></li>
  <li></li>
  <li></li>
</ol>

<ol style="list-style-type: baz; list-style-position: inside">
  <div>This list style should fallback to 'foo' in the shadow tree scope</div>
  <li></li>
  <li></li>
  <li></li>
</ol>
`
</script>