> Is that about right? Progressive Web Apps are strictly defined: 1. The app has an app manifest describing metadata about the web app, enabling it to be trea

> Is that about right? Progressive Web Apps are strictly defined: 1. The app has an app manifest describing metadata about the web app, enabling it to be treated like an app (e.g. it can be installed) 2. The app has a service worker, enabling it to work offline like a native app. 3. It's served over HTTPS. Those are the 3 technical requirements of a PWA. There's also the philosophical direction of Progressive Web Apps: they're progressive, meaning they offer the app's essential experience no matter the device, but enhance progressively based on the device they're running on. That is, more capable devices let the app offer more functionality without blocking out users on lower-end devices.