1) Offline support. You can read any previously viewed articles on my blog without a network connection. Also, if you attempt to read a new article while offline I display an offline page rather than failing altogether.
2) App install banners: With an app manifest in place, Chrome for Android and Opera for Android now prompt users to install my blog as an app on their device’s home screen. The screenshot below shows the workflow in Chrome for Android:
If you wanna see a progressive web app in action, check out devdocs.io. I use it everyday on both my phone and laptop without a network connection.