11.54.3 Can you answer these questions?

11.54.3.1 Chapter title on two lines

https://tex.stackexchange.com/landing/r/digest?cta=question&id=749340

I'm looking for help because I'm having trouble writing very long chapter titles on two lines. 
Can you help me ? 
\documentclass[a4paper,11pt,french]{book} 
\usepackage{lmodern} 
\usepackage[T1]{fontenc} 
... 
[tikz-pgf]
 

asked by Matmat81 https://tex.stackexchange.com/landing/r/digest?cta=user&id=194189 Score of 1

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

11.54.3.2 Is there a process for creating WCAG 2.1 AA compliant files using LaTeX?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=749359

In April of 2026, all publicly funded institution in the United States will be required to comply with the WCAG 2.1, level AA standards.  More information about this is provided on an ADA factsheet. 
... 
[accessibility]
 

asked by Xander Henderson https://tex.stackexchange.com/landing/r/digest?cta=user&id=299781 Score of 4

11.54.3.3 Preprocessing an environment body and replacing certain environments: Nesting aligns

https://tex.stackexchange.com/landing/r/digest?cta=question&id=749502

I want to learn some advanced token manipulation techniques and set myself the following "academic" challenge: Write an environment that takes its body, places certain elements of said body ... 
[align] [nesting] [argument-processors]
 

asked by sqrt6 https://tex.stackexchange.com/landing/r/digest?cta=user&id=339675 Score of 1