-id="combobox-aria-activedescendant">
              <td></td>
              <th scope="row">
                <code>aria-activedescendant="ID_REF"</code>
              </th>
              <td><code>input[type="text"]</code></td>
              <td>
                <ul>
                  <li>When an option in the listbox is visually indicated as having keyboard focus, refers to that option.</li>
                  <li>When navigation keys, such as <kbd>Down Arrow</kbd>, are pressed, the JavaScript changes the v