le">
          <thead>
            <tr>
              <th>
                Internal slot
              </th>
              <th>
                Initial value
              </th>
              <th>
                Description
              </th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td>
                <dfn data-dfn-for="Window">[[\TitleBarArea]]</dfn>
              </td>
              <td>
                Empty [=struct=] for the title bar region.
           