Hi,
HTML5 apps (converted into PP i.e. .apk or other formats) need internet to fetch data from the server.
The app should only have .html/.css/.JS(vanilla/frameworks) code and the code needs to be responsive, then by using phonegap build we can produce mobile installable files.
Please lets us know if any more clarification needed and we can go ahead and start off with the work.
Regards,
Shams