HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>counter-increment: none</title>
  <style>
    body {
      counter-reset: section;
    }

    h2 {
      counter-increment: section;
    }

    h2.skip {
      counter-increment: none;
    }

    h2::before {
      content: counter(section) ". ";
    }
  </style>
</head>
<body>
  <h2>First</h2>
  <h2 class="skip">No increment</h2>
  <h2>Second</h2>
</body>
</html>

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CSS counter-increment Property — none