5.25.3 Can you answer these questions?

5.25.3.1 How to reproduce the beautiful LIB style box as in the tcolorbox document using mdframed package?

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=501044

I tried to reproduce the beautiful LIB type box as in tcolorbox document using mdframed package. But I failed, I don't know how to produce the clip effects using mdframed package. The rotated  ... 
[tikz-pgf] [tcolorbox] [mdframed]
 

asked by C. Davide https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=136916 1 vote

5.25.3.2 Use \apptocmd to redefine \chapter

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=500604

I am trying to write the style name into the marginal part, e.g., CN&CT to come at marginal note for \chapter tag, for this, I tried with the code, which are follows as: 
\documentclass{book} 
... 
[chapters] [etoolbox]
                                                                                  

                                                                                  
 

asked by MadyYuvi https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=121024 1 vote

5.25.3.3 Evaluate variables for positioning multiple times

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=500931

Here is a working code (I'll describe it just after) : 
\documentclass[border=2pt]{standalone} 
\usepackage[utf8]{inputenc} 
\usepackage{graphics} 
\usepackage{tikz,pgfplots} 
... 
[nodes] [coordinates] [evaluat]
 

asked by LMT-PhD https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=48185 1 vote