Service Workers are the hot new thing in web APIs. They’re designed to be like the HTML5 Application Cache, but without being objectionable.

Can you image your favorite web app working offline? Well, Progressive Web Apps (PWA) are here. One of their main benefits is that Service Workers will allow you to continue loading your apps even when there’s no internet connection.

Service Workers are also helpful for offline caching and performance. You can write code to cache your application shell to work offline and populate its content using JavaScript.

For example, your application should work offline, but it doesn’t mean that you must set-up a background queue or store your data in a persistent storage – a offline message (e.g. “You’re offline, check your network status.”) is enough.