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chromium/third_party/blink/web_tests/external/wpt/css/css-counter-styles/counter-style-at-rule/system-extends.html 

<!DOCTYPE html>
<meta charset="UTF-8">
<title>CSS Test: system extends</title>
<link rel="author" title="Xidorn Quan" href="https://www.upsuper.org/">
<link rel="help" href="https://drafts.csswg.org/css-counter-styles-3/#extends-system">
<link rel="match" href="system-extends-ref.html">
<link rel="stylesheet" href="support/test-common.css">
<style type="text/css">
  @counter-style a {
    system: extends upper-roman;
    prefix: "Chapter ";
    range: 1 5;
  }
  @counter-style b {
    system: extends a;
    prefix: "Section ";
    range: 1 6;
  }
</style>
<ol start="-2" style="list-style-type: a">
  <li><li><li><li><li>
  <li><li><li><li><li>
</ol>
<ol start="-2" style="list-style-type: b">
  <li><li><li><li><li>
  <li><li><li><li><li>
</ol>