I am testing things out in QuestJS, and I believe I have found a way to check for mobile browsers.
I cannot test this on Mac or any other Apple devices.
I would be grateful to anyone who entered BROWSER with this game loaded in a Mac, an iPhone, or an iPad then posted the output here.
You are in a room.
5.0 (iPhone; CPU iPhone OS 11_2_1 like Mac OS X) AppleWebKit/604.4.7 (KHTML, like Gecko) Version/11.0 Mobile/15C153 Safari/604.1