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I was going to post that. Either as subtext, or as explanations below, or whatever xkcd does.

• junon 5y ago
  Xkcd uses alt text or titles, can't remember which, to pop up an accessibility tooltip. Clever and fun but it's quite dated and doesn't work on most (all?) mobile browsers.
  • macintux 5y ago
    Using mobile safari, at least, you can tap and hold to see the alt text.
    • junon 5y ago
      Ah yeah but that's not very good typical UX, is it? To have to rely on the save menu to see alt text.
      • macintux 5y ago
        Definitely lacking in discoverability.