HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>CSS table borders (modern)</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}.data-table{border-collapse:collapse;width:100%;max-width:360px}.data-table td,.data-table th{border:1px solid #cbd5e1;padding:.55rem .75rem;text-align:left}.data-table th{background:#f1f5f9}.ok{margin-top:1rem;padding:.75rem 1rem;border-radius:8px;font-size:.875rem;max-width:480px;background:#ecfdf5;border:1px solid #bbf7d0;color:#166534}</style>
</head>
<body>
  <h1>CSS borders (recommended)</h1>
  <p>Use <code>border-collapse</code> and cell borders instead of <code>rules</code>:</p>

  <table class=data-table>
    <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=ok><strong>Best practice:</strong> CSS gives reliable grid lines in all modern browsers.</p>
</body>
</html>

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HTML rules Attribute — CSS border replacement