For math, theirs no consensus, and pulldown cmark doesn't support (theirs a PR, but it's bad)
Zulip does
Inline: $$O(n^2)$$
Displayed:
\int_a^b f(t)\, dt = F(b) - F(a)
![image](https://user-images.githubusercontent.com/28781354/103207416-2384ea00-48f6-11eb-88b1-19841900cdb4.png)
Also I need to do links + static images
I either want zulip style or full mdx
The main non standard requirements are
For diagrams, I can detect eg
Inline: $$O(n^2)$$
Displayed: