this post was submitted on 13 Jan 2025
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[โ€“] smeg@feddit.uk 2 points 4 days ago (1 children)

Are sub and superscript officially supported by markdown now? Or is that a Lemmy-specific extension?

[โ€“] infeeeee@lemm.ee 3 points 4 days ago

Lemmy-ui uses markdown-it: https://github.com/LemmyNet/lemmy-ui/blob/main/package.json#L65

Markdown-it follows the CommonMark spec with extensions: https://spec.commonmark.org/current/ As I see superscript is not part of the spec, but listed in the markdown-it readme as a plugin, so I guess it's coming from there: https://github.com/markdown-it/markdown-it?tab=readme-ov-file#syntax-extensions

They are also listed in package.json:

    "markdown-it-sub": "^2.0.0",
    "markdown-it-sup": "^2.0.0",

https://github.com/LemmyNet/lemmy-ui/blob/main/package.json#L73

Lemmy docs about markdown support: https://join-lemmy.org/docs/users/02-media.html#text