Most things, including graphics, sound and loading and running disc images.
What does not
In fullscreen under gnome-shell the gnome menus are still visible pushing the whole window down.
Menu bar is not very visible #37591 as colours are incorrect.
Large directories are hard to navigate because of a problem in the file dialog where it re-draws with a smaller size font, causing the highlight to be incorrect, it's worse as you can't resize this in beebem.
What was not tested
|Ubuntu 17.04 "Zesty" amd64 (+ variants like Kubuntu)
|Aug 28 2017
|Ubuntu 14.10 "Utopic" amd64 (+ variants like Kubuntu)
|Nov 21 2014
|an anonymous user