HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>rules — JavaScript</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}.note{margin-top:.75rem;font-size:.875rem;color:#475569}.warn{margin-top:.75rem;padding:.75rem 1rem;border-radius:8px;font-size:.875rem;max-width:480px;background:#fef3c7;border:1px solid #fde68a;color:#92400e}</style>
</head>
<body>
  <h1>Dynamic table.rules</h1>
  <p>Script sets <code>rules</code> to <code>"cols"</code> on load:</p>

  <table id=dynamicTable border=1>
    <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=note id=status aria-live=polite>rules: (default)</p>
  <p class=warn><strong>Note:</strong> Changing <code>rules</code> may not visibly affect the table in modern browsers.</p>

  <script>const table=document.getElementById("dynamicTable");table.rules="cols",document.getElementById("status").textContent='rules: "'+table.rules+'"'</script>
</body>
</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

HTML rules Attribute — JavaScript table.rules