Install and run 'mpv' and the following problems occur:

1. There are no window decorations
2. Window is not resizable due to #1
3. The OSD appears at the top instead of the bottom, and it leaves solid black when hidden rather than transparency. Compare this with running it in weston and you can see a difference with what should be the smaller sized surface corresponding to the OSD.
4. Using 'Close' from the shelf menu doesn't close the application