HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>Dynamic border 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}td,th{padding:.55rem .75rem;text-align:left}th{font-weight:600}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}</style>
</head>
<body>
  <h1>Dynamic border</h1>
  <table id=dynamicElement>
    <tr>
      <th>Name</th>
      <th>Age</th>
    </tr>
    <tr>
      <td>Alice</td>
      <td>25</td>
    </tr>
    <tr>
      <td>Bob</td>
      <td>30</td>
    </tr>
  </table>
  <p class=hint>JavaScript sets <code>border="2"</code> for a 2-pixel table border. For border color and style, use CSS instead.</p>
  <script>document.getElementById("dynamicElement").setAttribute("border","2")</script>
</body>
</html>

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HTML border Attribute — Dynamic JavaScript