Unable to see Prototype in fullscreen mode

Right now when a prototype is shared for review and viewed on a mobile device with the "Open in fullscreen" option checked it still renders within the browser "chrome". Is there a way to have it truly appear in fullscreen, similar to what Marvel and InVision have done? I would very much like to use XD as a primary prototyping and user testing tool, but not having the app simulate the "real thing" is a deal breaker. Please, if anyone has any info on this, it would be greatly appreciated.

And yes, I'm aware that it works fullscreen in the dedicated XD mobile app. I am looking for a solution in which I can send a client or potential user a link and have them use it sans any additional barriers.

Adobe XD

Marvel

{Renamed By MOD}