How to make push like on mail.ru?

Question

Push technologies

Good evening,
when you visit a page, for example https://news.mail.ru/society/27513369 , a message appears in the upper left corner Do you want to be the first to receive the most important news? Sign up for notifications! .
How can this be implemented on your landing page? those. not to faceless and ugly standard push, but like this

Answer 1

Push API html5 on Google and whether here is a link to MDN like what you need.
https://developer.mozilla.org/en/docs/Web/API/Push_API