Earlier quoted context omitted.
I find that syntax more palatable than what is going on in JSX to be honest. I actually like having a separate declarative syntax for describing the tree structure of a page. Some languages manage to actually seamlessly incorporate this, for example SXML libraries in Schemes, but I have not seen it being done in a mainstream language yet.
Yeah, not a huge fan of either either to be honest, but probably JSX slightly before Twig only because it's easier for someone who written lots of HTML. Best of them all has to be hiccup I think, smallest and most elegant way of describing HTML. Same template but in as a Clojure function returning hiccup: (defn template [user] [:html [:head [...]]] [:body (when (:logged-in user) [:div "Hello " (:name user)])]) Basica…
Have a look at: https://www.gnu.org/software/guile/manual/html_node/SXML.htm... or https://docs.racket-lang.org/sxml/SXML.html
And as you say, part of the language itself, which means no need to learn something different, and no need to learn a pseudo-HTML or lookalike like with JSX, which then needs to be actually parsed by the framework (or its dependencies), unlike SXML, which is already structured data, already understood perfectly in the same language and only needs to be rendered into HTML.