Sites can definitely work offline using the new Service Worker system: http://www.html5rocks.com/en/tutorials/service-worker/introd.... Try this example: https://voice-memos.appspot.com.
Re:Goodbye, Native Mobile Apps
by icebraining on Thursday September 24, 2015 @07:07PM
(#10275413)
Between Application Cache and various data storage solutions (local storage, the File API, etc), webapps can do that.
Or when you want to own your own data, or work offline…