As in it runs in full full screen? I am trying it out on an iphone 11 in safari, when I tap fullscreen nothing happens, it just highlights the button white but the search bar and tabs still appear. Perhaps it is something with apple or safari, for example the purple enemies in the ball dodge game appear jittery on my iphone 11, but not on my friend's android phone using chrome.
Viewing post in Fullscreen on Mobile?
Yes, it launches in full screen just as a video would. I just have to tap the button to start the game, it instantly gets maximized.
The way you describe it, I would also assume that it is either an OS or browser related issue. I sadly have no knowledge about Apple/Safari, beside the fact that Android and iOS apps are two different things to do. You would assume HTML5 gets rid of incompatibilities, but maybe it is not that easy. Maybe you can find something of note by doing a google research?