this post was submitted on 18 Oct 2023
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Lemmy already has to deal with untrusted HTML since that's the "canonical" form of all ActivityPub Page/Note content.
I believe it converts to markdown when it receives it (if no markdown source is transmitted alongside, e.g. for posts from vanilla Mastodon) and stores/serves markdown from it's own API (to the webui and apps), so it wouldn't be much use for OP but in theory they can use a modified Lemmy or a different hypothetical fedi platform that supports HTML and it should work Mostly Fine™ (granted Lemmy already has trouble federating with itself most of the time so that may not be the best user experience, but it can work)
I didn't know that it accepted and translated HTML to be honest. Makes me wonder if there are any vulnerabilities based on the translation process, or if you can break out of it. Hmm.