[codingdave]

React works well for SPAs, but is not limited to them.

Either way, though, this does feel like an odd problem to be trying to solve. If you already are a JS app, just handle the blur events to stop them from going to another part of your page. The browser will still let them close the page (or the entire browser), but you can control the UX within your own app.

Whether or not that is a good idea is also a valid discussion. Because if you have to go to such lengths to get the UX you want on a mobile device, odds are you are going to end up with a sub-optimal UX, as mobile apps mostly match conventions.