11.77.3 Can you answer these questions?

11.77.3.1 XeLaTeX vs. LuaLaTeX with special font

https://tex.stackexchange.com/landing/r/digest?cta=question&id=755049

This time from me a question around a set of issues that can maybe actually be resolved in the near future, even though more likely via code changes than just configuration, but I am asking here first ... 
[xetex] [luatex] [harfbuzz]
 

asked by Alain Stalder https://tex.stackexchange.com/landing/r/digest?cta=user&id=193511 Score of 4

11.77.3.2 How to make a `tcolorbox` appear empty first, then reveal its content on click (Beamer pause)?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=755029

I am preparing a Beamer presentation and I am using several tcolorbox environments (custom theorem, definition boxes, etc.). 
What I want is the following animation: 
The tcolorbox frame should appear ... 
[beamer]
                                                                                  

                                                                                  
 

asked by Student https://tex.stackexchange.com/landing/r/digest?cta=user&id=141229 Score of 1

answered by samcarter_is_at_topanswers.xyz https://tex.stackexchange.com/landing/r/digest?cta=user&id=36296 Score of 0

11.77.3.3 Custom Nested List in Beamer

https://tex.stackexchange.com/landing/r/digest?cta=question&id=755071

I would like to create a custom nested list environment in Beamer that automatically becomes the default list style for every frame, so that I can place all the definitions in the preamble instead of ... 
[beamer] [lists] [enumerate] [itemize] [subitem]
 

asked by wrb98 https://tex.stackexchange.com/landing/r/digest?cta=user&id=83183 Score of 1