Web Fundamentals | Google Developers

Can I use... Support tables for HTML5, CSS3, etc

Notifications using Service Workers - Chrome Platform Status

Web notifications have an in page event delivery model by default which means that notifications cannot reliably outlive the page s lifetime allowing event delivery to be routed to a page s service worker provides a solid solution

Push API - Web APIs | MDN

The push api gives web applications the ability to receive messages pushed to them from a server whether or not the web app is in the foreground or even currently loaded on a user agent this lets developers deliver asynchronous notifications and updates to users that opt in resulting in better

web-push-libs

Web push libs has 8 repositories available follow their code on git hub