How to make notifications to clients in browsers (see description)?

Hi all. Often began to pop up notifications from various sites. Actually the question, what is this notification and how to add them to your website?
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1 answer
June 8th 19 at 17:21
Solution
It's free embedded on the website and notifications will be just for PC or phone, too? - nedra.Mills31 commented on June 8th 19 at 17:24
,
free integrates the website

Yes.
will be just for PC or phone too

https://caniuse.com/#feat=push-api - chaz commented on June 8th 19 at 17:27
Then I do not understand why a lot of services, where push notifications allegedly paid and advertising - the price is lower than the text?) - nedra.Mills31 commented on June 8th 19 at 17:30
as this "why do people earn money"? Because can! - chaz commented on June 8th 19 at 17:33

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