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<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>rules — rows (legacy)</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 .75rem;font-size:1.25rem;color:#0f172a}table{border-collapse:collapse;max-width:360px}td,th{padding:.55rem .75rem;border:1px solid #cbd5e1;text-align:left}th{background:#f1f5f9}.warn{margin-top:1rem;padding:.75rem 1rem;border-radius:8px;font-size:.875rem;max-width:480px;background:#fef3c7;border:1px solid #fde68a;color:#92400e}</style>
</head>
<body>
  <h1>rules="rows"</h1>
  <p>The <code>rules</code> attribute specified which internal table borders to show (HTML 4).</p>

  <table border=1 rules=rows>
    <thead>
      <tr>
        <th>Name</th>
        <th>Age</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td>John</td>
        <td>30</td>
      </tr>
      <tr>
        <td>Jane</td>
        <td>25</td>
      </tr>
    </tbody>
  </table>

  <p class=warn><strong>Obsolete:</strong> Modern browsers often ignore <code>rules</code>. Use CSS borders instead.</p>
</body>
</html>

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HTML rules Attribute — rules=rows (legacy)