first, something old: html + fullscreen
in chrome, when the page is zoomed (ctrl +), and you set a cart fullscreen, the cart frame is zoomed accordingly and cropped top&bottom. this only happens on chrome, firefox & edge work ok. same thing here on the bbs or html export.
second, something I only just noticed, can't try on older versions right now: html + mouse + fullscreen
the mouse stays stuck on (0,0) when on fullscreen.
(all this on windows10, can't test linux for now)
edit: cart for testing