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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>Dynamic colspan Example</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}table{border-collapse:collapse;max-width:480px}td,th{padding:.55rem .75rem;border:1px solid #cbd5e1;text-align:left}th{background:#f1f5f9}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:480px}</style>
</head>
<body>
  <h1>Dynamic colspan with JavaScript</h1>
  <table>
    <tr>
      <th>Header 1</th>
      <th>Header 2</th>
      <th>Header 3</th>
    </tr>
    <tr>
      <td id=dynamicCell>This cell will span 3 columns</td>
    </tr>
  </table>
  <script>document.getElementById("dynamicCell").colSpan=3</script>
  <p class=hint>Use <code>cell.colSpan = 3</code> (capital S) or <code>setAttribute("colspan", "3")</code> in JavaScript.</p>
</body>
</html>

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HTML colspan Attribute — Dynamic JavaScript