User blog comment:Martirsadota/The Great HTML5 Switcheroo: How it Affects TTKs Like You/@comment-68.146.133.92-20180804174708/@comment-26461371-20180805120503

Easy: just play in any modern Android browser. They support HTML5 natively.

I'm still not sure about how they would handle the actual app, but you're probably right: an app that eventually invokes a browser, with the app handling logon and stuff.