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The CommonMark spec even has an example test case! The excuses for poor implementations are pretty thin.

• lilyball 9mo ago
  Not all markdown implementations are CommonMark
  • yencabulator 9mo ago
    There's not much reason to be anything else than CommonMark + extensions.
    • lilyball 9mo ago
      For new implementations, sure. But it's harder to change existing implementations (anything not already CommonMark-compatible will introduce unexpected changes to existing content if you switch to CommonMark), and especially for anything that's not being actively developed it's unlikely to ever change.