What is it now possible to develop applications for both web and mobile at the same time?

Question

Mobile development

We are starting to make a service, there will be small online games on the service. Over time, the same service is planned for mobile devices. One app, all games.
back-end will be: scala + java, play framework, mongodb.
What mini-games will be written on has not been decided yet, in connection with this the question is, if it is possible to develop games for the web now in such a way that it would be as easy as possible to port them to mobile?
Ideally, this is one code for both web and mobile, native look and feel, the ability to work offline.
I would also like to have good opportunities for integration with mobile markets.
So what do you recommend for this?
Maybe GWT + MGWT?
Any handy js+html5 wrappers for mobile?
Are there alternatives to js in this regard?

Answer 1

I use JS+HTML5 and phonegap (as a multi-platform wrapper with native access to a number of device functions via JS)
But not sure if it's the best...

Answer 2

Angularjs + Ionic.
You can create basic libraries in Angular, and use them already in the web, application programs, and mobile devices. Ionic is a multi-platform framework for mobile applications based on Angular.
This is what was confusing. Why will there be a separate service for mobile devices? I think the service should be the same for all clients. It is necessary to write so that both the web and mobile could use one service.