Are there any user documentations on how the hashtag bar works? I.e. how placing hashtags at the end of a posts create an expandable bar at the end of the post and also how hashtags with certain characters like in will normalized to ascii and placed there.

The doc on docs.joinmastodon.org/user/pos doesn't mention this.

@MastodonEngineering

RE: activitypub.blog/2025/11/12/7-

Mastodon's web client also show the hashtag bar when the hashtag are «out of band» in hashtag-tag w3.org/TR/activitystreams-voca but not in the post itself, e.g. like some posts from as quoted here.

Maybe other clients should display something similar to the hashtag bar? @phanpy, @tootappToot!.app ↙︎↙︎↙︎ @ivoryIvory by Tapbots :emoji_wink: ?

Event tough some clients don't show the out-of-band-hashtags, they are still searchable.

@MastodonEngineering

Screenshot of the hashtag bar of the quoted WordPress-post. Some clients might not show the hashtag associated with the post.

It show the hashtags #activitypub #CommandPalete #fediverse and in Norwegian indicating that there are 3 more hashtags
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If you have a fediverse account, you can quote this note from your own instance. Search https://mastodon.social/users/aslakr/statuses/115561804914993025 on your instance and quote it. (Note that quoting is not supported in Mastodon.)