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It works on hover for me. The orange text is hard to read against that background, though.

>(Click the pictures to reveal them)

Not working for me (iOS/safari). That's a bit weird.

Works fine in Firefox and Chrome in both Android and Windows. Looks like a Safari bug.

What's with the crabs? Is it an inside joke I'm not getting?

I think it started with the name given to Rust programmers: Rustaceans.

It is close to crustaceans so I think the puns just got out of hand from there :D

Ah, makes sense. I wondered if it had anything to do with the internet's recent rediscovery of carcinization.

"crustacean" > crab

"rust-acean"

That particular crab also happens to be the language's (unofficial) mascot character, Ferris.