> based on, compatible with, or is common mark? The first two. [The GFM spec][1] is literally just CommonMark with a few extra extensions added. They even high

> based on, compatible with, or is common mark? The first two. [The GFM spec][1] is literally just CommonMark with a few extra extensions added. They even highlighted the new sections green in the spec to make it clear where the GFM spec differs from CommonMark. Everything else is word-for-word identical. [1]: https://github.github.com/gfm/ https://github.github.com/gfm/