vhero wrote:1. whether X3 can be used as PWA.
With PWA, I assume you mean "progressive web app"? All modern mobile-friendly javascript-based websites are basically "progressive web apps". The only difference is that some PWA's can perhaps work without an internet connection, but X3 will not work without internet.
vhero wrote:2. Is it possible to show the visitor a banner after some time (delayed) that will allow the X3 to be placed on the home screen (bookmark- add to home screen icon - for mobile devices) ?
There are some options for this, but it definitely does NOT work on iPhone/iOS at least.
https://developer.mozilla.org/en-US/doc ... ome_screen
On iPhone, adding to home screen is done manually by the user from Safari share options.