Hyperfiddle markdown integrations (2017)

Hyperfiddle has been through all of the markdown renderers (both clojure and javascript). The different types of features to balance, and implementation-specific nuances / issues / bugs are too many and too complicated to list (though reddit votes do have a way of helping me find time to elucidate).
We settled on https://github.com/remarkjs/remark, so far, which meets our requirements of

cljs eval from markdown

(1 1 2 3 5 8 13 21 34 55)

inline styles

hello world

inline codemirror, try typing in it

Here is the Reagent integrations