How does a site send spam via browser notifications if the tab with this site is not open?

Question

JavaScript

Although in the Chrome settings it is worth allowing notifications by this site, but nevertheless, the tab is closed. It turns out that the browser in the background, without any extension, polls this site with some frequency?

Answer 1

Well, yes, this is such a technology, notifications from sites like youtube, so that new videos are not missed. And the spammers are right there. Therefore, I cut down these notifications to hell everywhere and completely.