   </td>
              <td>
                A [=struct=] that stores the values of the area that defines
                the title bar region. These values are `x`, `y`, `width`,
                `height`.
              </td>
            </tr>
          </tbody>
        </table>
      </section>
    </section>
    <section data-dfn-for='WindowControlsOverlay' data-link-for=
    'WindowControlsOverlay'>
      <h2>
        <dfn>WindowControlsOverlay</dfn> interface
      </h2>
      <pre class='idl' data-cite=