I use formattable a lot for the nice html tables (I think this is what an html widget is?) but when I am using a dark theme the inline output text seems to get converted to a light color without the background getting converted to dark:
This isn't much of an issue for me since I usually go through and pipe (then?) all the outputs to formattable once my analysis is done, but the Using Theme with Preview reminded me of it and I thought it might be helpful to have this pointed out too. I think I remember it affecting another widget too but for the life of me, I can't remember which.