How does the site display a notification if it is not open?

Question

Android

Android, Chrome.
Today I saw this notification:

I am subscribed to this magazine in telegram and sometimes I go to the site to read an article from it. But when this message got out, the log page was not open. How did she do it and how to prevent it?

Answer 1

https://habrahabr.ru/post/321924/
Desktop browsers ask permission to receive notifications

Answer 2

To do this, they came up with a Service Worker

Answer 3

How to enable or disable alerts in google help wikipedia
push technology

Answer 4

You must have allowed the site to send notifications. Look in your browser settings, maybe there you can adjust this matter.