WindowControlsOverlay

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

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

The WindowControlsOverlay interface of the Window Controls Overlay API exposes information about the geometry of the title bar area in desktop Progressive Web Apps, and an event to know whenever it changes. This interface is accessible from Navigator.windowControlsOverlay.

EventTarget WindowControlsOverlay

Instance properties

WindowControlsOverlay.visible Read only

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

Instance methods

WindowControlsOverlay.getTitlebarAreaRect()

Returns the size and position of the title bar.

Events

Listen to these events using EventTarget.addEventListener() or by assigning an event listener to the relevant oneventname property of this interface.

geometrychange

Fired when the geometry of the title bar area changes.

Examples

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