At first glance, there's a lot of words and not many examples. It's hard to quickly see what's different and special about this version of Markdown, other than "it's a formal subset of the other formats".

I see some examples for specific elements, but I'd love to see "here's an example demonstrating the problem(s) this addresses", and "here's the fixed version of that example".

There could be sub-sections of contrasting examples, like in coding style guides, showing the Old/New (Bad/Good?) styles.