Progressive Web App Browser Support

All major browsers are shipping PWA technologies. ServiceWorker is supported from the following versions onward.

You can follow the status of ServiceWorker here.

Progressive Web Apps are a progressive enhancement

Even though all browsers do not ship ServiceWorker support in their production versions, it is safe to add one in your application. It will enhance the user experience for a large number of your users but won't break the experience for anyone. As browsers add support, more and more of your users will get access to the enhanced functionality.