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So you have to pick your lock-in for a Markdown processor? Once you step outside of CommonMark, nothing is compatible. Compare that to AsciiDoc, reStructuredTex

So you have to pick your lock-in for a Markdown processor? Once you step outside of CommonMark, nothing is compatible. Compare that to AsciiDoc, reStructuredText, Org mode… these support metadata as a first-class feature (as you would expect from almost every other creative format: *.ogg, *.webm, *.odf, *.png, *.svg, *.html, etc.). Choosing such tools makes it a) harder to migrate to another tool & b) difficult/impossible for other tools to render it properly. You can skip that nonsense by just choosing a better format.

Seirdy 3y ago
It's a very common Markdown extension supported by PHP-Markdown-Extra, Goldmark, Pandoc, Kramdown, and dozens of others. Several of these have supported it for almost ten years now, with the same syntax. PHP-Markdown-Extra is the closest thing to a standard with more than GitHub-Flavored-Markdown; several other Markdown engines use its featureset as a baseline for compatibility for anything not present in GFM, even blocking the shipping of new features until after PME agrees on a syntax. So you can think of CommonMark as the lowest common denominator, GFM for an intermediate version, and PHP-Markdown-Extra as something suitable for building more advanced websites.