The book segment header links (in italic [0]) serve raw html which is probably not the intention (unless its an exercise for the reader that I've missed in my quickscan :-)

The section on mobile clients seems very timely. At least one fediverse server [1] is adopting elements of htmx and it would seem that the corresponding clients would be a canonical example using this technology.

[0] https://hypermedia.systems/book/part/htmx

[1] https://github.com/jointakahe/takahe