          <th scope="row">
                <code>tabindex="0"</code>
              </th>
              <td>
                <code>span</code>
              </td>
              <td>
                <ul>
                  <li>Makes the <code>menuitem</code> element keyboard focusable and part of the <kbd>tab</kbd> sequence of the page.</li>
                  <li>Only one <code>menuitem</code> in the <code>menubar</code> has <code>tabindex="0"</code>.</li>
                  <li>When the page loads, the first i