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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>rowspan — 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 1rem;font-size:1.25rem;color:#0f172a}table{border-collapse:collapse;max-width:360px}td{padding:.55rem .75rem;border:1px solid #cbd5e1}.merged{background:#f8fafc}.note{margin-top:.75rem;font-size:.875rem;color:#475569}</style>
</head>
<body>
  <h1>Dynamic rowSpan</h1>
  <table>
    <tr>
      <td id=dynamicCell class=merged>Spans 3 rows</td>
      <td>Row 1, Col 2</td>
    </tr>
    <tr>
      <td>Row 2, Col 2</td>
    </tr>
    <tr>
      <td>Row 3, Col 2</td>
    </tr>
  </table>
  <p class=note><strong>Note:</strong> <code>rowSpan</code> is set to <strong>3</strong> on load (capital S in JavaScript).</p>
  <script>document.getElementById("dynamicCell").rowSpan=3</script>
</body>
</html>

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HTML rowspan Attribute — JavaScript rowSpan