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CommonMark – highly compatible specification of Markdown

CommonMark is a strongly defined, highly compatible specification of Markdown, along with a suite of comprehensive tests to validate implementations against the specification. It was originally called Standard Markdown but renamed to CommonMark following objections from John Gruber, the original creator of Markdown. CommonMark is released under the Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) License.