Given that we build a javascript version of stanc3 with each release, it would be very simple to make a static web page hosted on github that would enable demos of pedantic mode, canonicalizer (--print-canonical) and other options like that. The "compiling/transpiling/formatting/...." steps are done on the users end.

If we make Github Pages for this repository, that could be hosted under https://mc-stan.org/stanc3/demo

It probably does not make sense to add printing of C++.

Any thoughts?