Here are the issues concerning the CSS part, we encountered with @julien-deramond.
The commits can be splited if needed or wanted or even be in another PR. I'm open to every comment that could help fix these issues.
Issues tackled by this PR:
New helper with (https://github.com/twbs/bootstrap/pull/36395/commits/47a4d3deaf7effa0b0bcd3434dceca27ce13f45c)
Using the new helper in doc and examples whenever it's feasible.
tabindex="-1" with (https://github.com/twbs/bootstrap/pull/36395/commits/73a86e8248980ce846db0e15894be3ba4732150f)
Remove the access, for keyboard users, to the input that is unused and here to avoid a Safari bug (https://github.com/twbs/bootstrap/pull/36176#discussion_r877120781)
Scrollspy examples with (https://github.com/twbs/bootstrap/pull/36395/commits/651d66ec40cd5385501195bc0eb8db90bbf899c5)
Change scrollspy code examples to be closer to the real implementation
Re-order js tables in doc with (https://github.com/twbs/bootstrap/pull/36395/commits/6c9b30a62a75b5839fbd1013b8b7c88cd756dc6f)
Re-ordering alphabetically js tables in doc to be more comprehensive and user friendly (except hide with hidden to keep logic)
Parcel with (https://github.com/twbs/bootstrap/pull/36395/commits/f7b83ca2d613e266f6b27887ebbe50413d85b791)
Fix some doc inconsistencies in parcel.md.
Align center with (https://github.com/twbs/bootstrap/pull/36395/commits/212ffe0894dc52ae46cd73bb1f4d7393cfb9e697)
Align center almost all the texts in examples in Category Layout. I found it more visual and followed the CSS-grid example. If these are approved, it might be good to backport it to flex utilities, etc...
Re-order helpers with (https://github.com/twbs/bootstrap/pull/36395/commits/eb4dc49a3792eb0dc1e1f7ae69891c1bb4a9f935)
Re-ordering alphabetically helpers. if these changes are approved, might be great to bring it back to other main categories such as Layout, Forms, etc...