Hi again 
So, I am wondering if I can show the descriptions of the script attributes via the Editor UI. I found from the API that args.description should allow me to do just that, but there is no hover popup showing, like in Playcanvas own attributes:
Adjusted my previous example, where selecting one of the buttons in the view should show the script with attributes containing descriptions. However, nothing is showing on hover:

https://playcanvas.com/editor/scene/862943
