  readonly attribute boolean visible;
        };

        dictionary WindowControlsOverlayGeometryChangeEventInit : EventInit {
          required DOMRect titlebarAreaRect;
          boolean visible = false;
        };
      </pre>
      <section>
        <h3>
          The <dfn>visible</dfn> attribute
        </h3>
        <p>
          The `visible` attribute is a [=boolean=] that returns `true` when the
          values of the {{Window/window}}.[[\TitleBarArea]] are not 0.
        </p>
      </section>
 