I asked at Stack Overflow yesterday, but here is probably the better place. I could not find an overview of extensions from different Markdown flavors. I remain wondering if someone actually has already done the work to collect all those syntactic additions and compare them? I’m particularly interested in incompatible ones and different approaches to solve the same task. This should be really helpful if one would like to write a guide for syntax extensions.
As a start, prior to my SO question, I had compiled a table based upon the Pandoc documentation which shows how that implementation handles its compatibility modes for other Markdown variants (GFM, MMD, MD Extra and classic
markdown.pl), but I’m afraid I can’t post a real table here either.