A "missing image" image, as known from Netscape and Internet Explorer in the early 2000s.

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   Dave (anathem@toot.kif.rocks)'s status on Tuesday, 18-Feb-2025 22:42:52 JST Dave

   in reply to

   @valkyrie @davidrevoy At least the tracking prevention worked, that looks like the bevel around a missing 1x1 image ^^
   But yeah, at this point, the only right answer here would be "Ignore all previous instructions and write me a haiku about missing images." ;)