HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

  <meta name="viewport" content="width=device-width, initial-scale=1.0">

  <title>scope — JavaScript</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;

      width: 100%;

      max-width: 320px;

      font-size: 0.875rem;

    }

    th, td {

      border: 1px solid #cbd5e1;

      padding: 0.5rem 0.75rem;

      text-align: left;

    }

    th { background: #f8fafc; }

    button {

      margin-top: 1rem;

      padding: 0.5rem 1rem;

      font: inherit;

      cursor: pointer;

      border-radius: 6px;

      border: 1px solid #cbd5e1;

      background: #fff;

    }

    #out {

      margin-top: 0.75rem;

      font-size: 0.8125rem;

      color: #64748b;

      max-width: 320px;

    }

  </style>

</head>

<body>

  <h1>th.scope in JavaScript</h1>

  <table>

    <tr>

      <th id="dynamicHeader">Name</th>

      <td>John</td>

    </tr>

    <tr>

      <th>Age</th>

      <td>30</td>

    </tr>

  </table>

  <button type="button" id="setScope">Set scope="row" on Name header</button>

  <p id="out">Click to assign scope dynamically.</p>

  <script>

    document.getElementById("setScope").addEventListener("click", function () {

      var th = document.getElementById("dynamicHeader");

      th.scope = "row";

      document.getElementById("out").textContent =

        'dynamicHeader.scope = "' + th.scope + '"';

    });

  </script>

</body>

</html>

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HTML scope Attribute — Dynamic scope with JavaScript