HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>Dynamic cellpadding 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:420px}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}</style>
</head>
<body>
  <h1>Dynamic cellPadding</h1>
  <table id=dynamicTable border=1>
    <tr>
      <td>Cell 1</td>
      <td>Cell 2</td>
    </tr>
    <tr>
      <td>Cell 3</td>
      <td>Cell 4</td>
    </tr>
  </table>
  <p class=hint>JavaScript sets <code>table.cellPadding = 15</code> (note the capital P in the DOM property).</p>
  <script>var table=document.getElementById("dynamicTable");table.cellPadding=15</script>
</body>
</html>

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HTML cellpadding Attribute — Dynamic JavaScript