The geometrychange event is fired when the position, size, or visibility of a Progressive Web App's title bar area changes.

This only applies to Progressive Web Apps installed on desktop operating systems and use the Window Controls Overlay API.

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("geometrychange", (event) => {});

ongeometrychange = (event) => {};

A WindowControlsOverlayGeometryChangeEvent. Inherits from Event.

In addition to the properties listed below, properties from the parent interface, Event, are available.

titlebarAreaRect

A DOMRect representing the position and size of the title bar area within the app's content.

visible

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

Using addEventListener():

navigator.windowControlsOverlay.addEventListener("geometrychange", (event) => {
  const { x, y, width, height } = event.titlebarAreaRect;
  console.log(
    `The titlebar area coordinates are x:${x}, y:${y}, width:${width}, height:${height}`,
  );
});

Using the ongeometrychange event handler property:

navigator.windowControlsOverlay.ongeometrychange = (event) => {
  const { x, y, width, height } = event.titlebarAreaRect;
  console.log(
    `The titlebar area coordinates are x:${x}, y:${y}, width:${width}, height:${height}`,
  );
};