The onappinstalled attribute of the Window object serves as an event handler for the appinstalled event, which is dispatched once the web application is successfully installed as a progressive web app. The event that is fired is a "simple event" that implements the Event interface. 
window.onappinstalled = function(event) { ... };
window.onappinstalled = function(ev) { console.log('The application was installed.'); };
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
onappinstalled | 
64  | 
79  | 
49-76  | 
No  | 
No  | 
No  | 
57  | 
57  | 
49  | 
No  | 
No  | 
7.0  | 
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    https://developer.mozilla.org/en-US/docs/Web/API/Window/onappinstalled