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Arizona Chess xkcd.com/3014

@xkcd.com I suggest you use Bluesky's alt tex feature for uploaded images. It assists visually impaired users, and would allow you to incorporate the beloved alt text from comics on your main site!

If it's being used for the alt text from the main site, that wouldn't assist visually impaired users. Also, I think it's probably being left out on purpose as a reason to go check the main site, I know some comic artists do that kind of thing.