I am still a bit confused about textbackgrounds.
So I created a wiki page http://wiki.contextgarden.net/TextBackground
(in order to try to confuse others!)

I have two questions:
1. The live conTeXt of the wiki does not show the background,
whereas the code works using the context minimals.
Why?

2. Setting background=screen as opposed to background=color,backgroundcolor=middlegray
doesn't work (live & minimals). Why?

Can anyone help here? Beyond details.pdf, I have not found many explanations.

Thanks