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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>col span Attribute</title>
  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}p{margin:0 0 1rem;font-size:.95rem}table{border-collapse:collapse;width:100%;max-width:480px;background:#fff}td,th{border:1px solid #cbd5e1;padding:.5rem .75rem;text-align:center}th{background:#f1f5f9;color:#0f172a}.tip{margin-top:.75rem;background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;padding:.75rem 1rem;font-size:.875rem;color:#1e40af;max-width:480px}</style>
</head>
<body>
  <h1>span on col</h1>
  <p>First col spans 3 columns; second col styles the last one:</p>
  <table>
    <colgroup>
      <col span=3 style=background:#f0fdf4>
      <col style=background:#fef2f2>
    </colgroup>
    <tr>
      <th>Q1</th>
      <th>Q2</th>
      <th>Q3</th>
      <th>Total</th>
    </tr>
    <tr>
      <td>10</td>
      <td>12</td>
      <td>15</td>
      <td>37</td>
    </tr>
    <tr>
      <td>8</td>
      <td>11</td>
      <td>14</td>
      <td>33</td>
    </tr>
  </table>
  <p class=tip><code>span="3"</code> applies the same col rule to the first three columns.</p>
</body>
</html>

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span Attribute on col