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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

  <meta name="viewport" content="width=device-width, initial-scale=1.0">

  <title>CSS counter-set multiple</title>

  <style>

    body {

      font-family: sans-serif;

      padding: 1.5rem;

      line-height: 1.6;

    }



    .outline {

      counter-reset: chapter section;

    }



    .outline h2 {

      counter-increment: chapter;

      counter-reset: section;

    }



    .outline h2::before {

      content: "Chapter " counter(chapter) ": ";

      color: #059669;

      font-weight: 600;

    }



    .outline h3 {

      counter-increment: section;

      margin-left: 1rem;

    }



    .outline h3::before {

      content: counter(chapter) "." counter(section) " ";

      color: #64748b;

      font-weight: 600;

    }



    .appendix {

      counter-set: chapter 3 section 2;

      margin-top: 1.5rem;

      padding-top: 1rem;

      border-top: 2px dashed #cbd5e1;

    }

  </style>

</head>

<body>

  <article class="outline">

    <h1>Document outline</h1>

    <h2>Basics</h2>

    <h3>Syntax</h3>

    <h3>Values</h3>

    <h2>Advanced</h2>

    <h3>Patterns</h3>



    <div class="appendix">

      <h2>Appendix (starts at Chapter 4)</h2>

      <h3>Reference (shows 4.3)</h3>

      <h3>Glossary (shows 4.4)</h3>

    </div>

  </article>

</body>

</html>

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CSS counter-set Property - Multiple Counters