ocument
        and and the [=window controls=]. Modern applications can take advantage
        of the area in the title bar in order to display UI content to create a
        better UX.
      </p>
      <p>
        For installed web apps hosted within a user agent (UA) frame, it is
        possible to get some form of customization in the frame by declaring
        which type of display mode is preferred. Developers can select the mode
        that best meets the needs of the application via the [=manifest