HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>Nested Ordered List</title>
  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 1rem;font-size:1.25rem;color:#0f172a}ol{padding-left:1.5rem}ol ol{margin-top:.35rem}</style>
</head>
<body>
  <h1>Nesting Lists</h1>
  <ol>
    <li>Main item 1</li>
    <li>Main item 2
      <ol>
        <li>Subitem 2.1</li>
        <li>Subitem 2.2</li>
      </ol>
    </li>
    <li>Main item 3</li>
  </ol>
</body>
</html>

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HTML ol Tag — Nesting Lists