HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>colgroup Column Widths</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}table{border-collapse:collapse;width:100%;max-width:400px;background:#fff;table-layout:fixed}td,th{border:1px solid #cbd5e1;padding:.5rem .75rem;text-align:left}th{background:#f1f5f9;color:#0f172a}</style>
</head>
<body>
  <h1>Column Widths</h1>
  <table>
    <colgroup>
      <col style=width:30%>
      <col style=width:70%>
    </colgroup>
    <tr>
      <th>Item</th>
      <th>Description</th>
    </tr>
    <tr>
      <td>Apple</td>
      <td>Red and sweet fruit</td>
    </tr>
    <tr>
      <td>Carrot</td>
      <td>Orange crunchy vegetable</td>
    </tr>
  </table>
</body>
</html>

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Column Widths with colgroup