Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The WindowControlsOverlayGeometryChangeEvent interface of the Window Controls Overlay API is passed to geometrychange when the size or visibility of a desktop Progress Web App's title bar region changes.

Event WindowControlsOverlayGeometryChangeEvent


WindowControlsOverlayGeometryChangeEvent() Experimental

Creates a WindowControlsOverlayGeometryChangeEvent event with the given parameters.

Instance properties

Also inherits properties from its parent Event.

WindowControlsOverlayGeometryChangeEvent.titlebarAreaRect Read only Experimental

A DOMRect representing the position and size of the title bar region.

WindowControlsOverlayGeometryChangeEvent.visible Read only Experimental

A Boolean that indicates whether the window controls overlay is visible or not.


The following example shows how to use a WindowControlsOverlayGeometryChangeEvent instance by adding an event handler on the Navigator.windowControlsOverlay property, to listen to geometry changes of a PWA's title bar region.

if ("windowControlsOverlay" in navigator) {
    (event) => {
      if (event.visible) {
        const rect = event.titlebarAreaRect;
        // Do something with the coordinates of the title bar area.


Window Controls Overlay
# windowcontrolsoverlay-interface

Browser compatibility

BCD tables only load in the browser

See also