Push notify to a browser on mobile phone

[nitiphone2021]

According to I create a mobile app by Flutter and I also build it to web base also.
But I want to send some notify to mobile web browser to alert them come back to do sometask.
I ever see it on other website but I don't know how to make it. Is it on PWA?
Please guide me how can I make it like that

[requinix]

You can do it on mobile the same way you can do it on the desktop: with AJAX polling or websockets.

Polling is easier to implement but not instantaneous - which is probably fine for you.

[nitiphone2021]

18 hours ago, requinix said:

You can do it on mobile the same way you can do it on the desktop: with AJAX polling or websockets.

Polling is easier to implement but not instantaneous - which is probably fine for you.

But I want to send them some notify when the user is not open the browser. How can i send to it?

[requinix]

You'll need to use service workers.