Markdown has a declarative syntax that is both powerful and easy to learn for technical and non-technical folks. However, due to the consequential ambiguities in its original specification, there have been a number of distinct flavors (or custom versions). This has led to a steep divergence from what can be parsed and what is rendered. Find out how CommonMark provides a standardized specification of Markdown that reflects its real-world usage.

https://smashingmagazine.com/2020/12/commonmark-formal-specification-markdown/