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@lauti Trying to leave a comment, but Codeberg's bugging out on me right now.

“Hashtags are represented as type Hashtag just like mastodon does it. Is there a fep for this?”

Hashtag is additionally specified as a type in a Community Group draft report on miscellaneous terms: https://swicg.github.io/miscellany/#Hashtag

It might get added to a 1.1 version of a proper W3C standard (AS-vocab I assume) now that the Working Group is active again.