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About Progressive Web Applications

Main Features of Progressive Web Apps

  • Progressive – It works for every user, no matter which browser they choose to use. It is because it’s built with progressive enhancement as its core tenet.
  • Responsive – It works for desktop, mobile, tablet or any other form which will is next in line.
  • Independent connectivity – It has been enhanced to work offline or even in low-quality networks.
  • App-like feature – It totally has the user-friendly app-style usage and navigation chiefly because it is built on the app shell model.
  • Fresh – It is always the up-to-date cause of the service worker update process.
  • Safe – Served via HTTPS it prevents snooping and ensures contents that cannot be tampered with.
  • Discoverable– It is easily discoverable by the search engines as it is backed by W3C manifests and service worker registration scope.
  • Re-engage able– Push notifications feature makes it easier for it to re-engage.
  • Installable– It allows the users to keep the apps they find most useful on their home screen without the hassles of an app store.
  • Linkable– It can be easily shared via URL. And does not require complex installations.

Service Workers

Service workers are the backbone technology behind Progressive Web App. They power offline functionality, push notifications, background content updating, content caching and a lot more of services and applications are herein attached with Service workers.

In other relative terms, we can say that Service worker is the worker script that works behind the scenes, independent of the app, and runs in response to events like network requests, push notifications, connectivity changes so on and so forth. In simpler terms, one can say that Service workers act as the proxy.

App Shell

The App Shell is a simple design concept where the initial load of a mobile web app provides a basic shell of an app UI, and the contents of the app are loaded after. It is not a Web API or a framework, but it is the design approach that developers can choose to adhere to enhanced caching abilities of service workers.