        region of the window frame occupied by the title bar without the area
          corresponding to the [=overlay=] that houses the [=controls of the
          window=].
        </li>
        <li>
          <dfn data-lt="controls of the window">Window controls</dfn>:
          interface elements that the operating system uses consistently across
          applications to enable the user to perform certain actions to control
          the application. Common actions in the [=window controls=] include
  