[Kwpolska]

The linked post contains three cases of Markdown syntax (underscores) leaking into the text, where actual italics were likely intended. This is the most basic Markdown syntax element failing to work. The problem CommonMark is trying to solve is not adding new features (the only one they added to Gruber Markdown is fenced code blocks), but rather specifying how to interpret edge cases to ensure the same Markdown code produces the same HTML everywhere.

[awesan]

I understand the goal of the spec. In my experience once some spec document gets adapted widely enough, there's a strong incentive to add new features to it, which renderers would then be compelled to implement. Before you know it, MD is a complicated spec that doesn't serve its original purpose.

In this case a few minor edge cases is really not a big deal compared to that (in my opinion).