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<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>summary — JavaScript 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 .75rem;font-size:1.25rem;color:#0f172a}table{border-collapse:collapse;width:100%;max-width:360px;font-size:.9375rem}td,th{border:1px solid #cbd5e1;padding:.45rem .65rem;text-align:left}th{background:#f1f5f9}.hint{font-size:.8125rem;color:#64748b;margin-top:.75rem}</style>

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<body>

  <h1>Dynamic summary (legacy)</h1>



  <table id=salesTable>

    <thead>

      <tr>

        <th>Quarter</th>

        <th>Sales</th>

      </tr>

    </thead>

    <tbody>

      <tr><td>Q1</td><td>$10,000</td></tr>

      <tr><td>Q2</td><td>$15,000</td></tr>

      <tr><td>Q3</td><td>$20,000</td></tr>

      <tr><td>Q4</td><td>$25,000</td></tr>

    </tbody>

  </table>



  <script>document.getElementById("salesTable").setAttribute("summary","Dynamically added summary describing the sales table.")</script>



  <p class=hint>JavaScript adds <code>summary</code> after load. Prefer migrating to <code>&lt;caption&gt;</code> instead.</p>

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HTML summary Attribute — JavaScript