Limited availability
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.
WindowControlsOverlay.visible Read only Experimental
A Boolean that indicates whether the window controls overlay is visible or not.
WindowControlsOverlay.getTitlebarAreaRect() Experimental
Returns the size and position of the title bar.
Listen to these events using EventTarget.addEventListener() or by assigning an event listener to the relevant oneventname property of this interface.
geometrychange Experimental
Fired when the geometry of the title bar area changes.
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.
}
},
);
}
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