How to add push notifications to the site?

Question

Google

Hello, how to add push notifications to the site? Are there any services or can be done without resorting to them, at the program level?

Answer 1

For example, PushAll.ru is designed as a platform, i.e. in fact, you don't even need to have a website to send out alerts. Plus, notifications can come to phones and computers, and to telegrams and even to mail.