mastodon.social is one of the many independent Mastodon servers you can use to participate in the fediverse.
The original server operated by the Mastodon gGmbH non-profit

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@aartaka @esther@strangeobject.space @james@strangeobject.space @viernullvier@strangeobject.space As you can see there are lots of selectors meaning that this applies to a particular element on a particular website for which the value/semantics of alt are known