httpstatus.io is actually a good tool that I've been using for over 3 years now so I think it isn't that domain that got acquired?

Yeah I did some mild research and the domain I'm thinking of was httpstatuses.com which was acquired by WebFX and turned useless. jkulton revived it at https://httpstatuses.io/ which they document in their blog https://jkulton.com/2022/reviving-httpstatuses/

So in a way we do TDD and let the vibe machine code the system against the tests :)

That's why I like using PicoCSS on small projects, it instantly adds style without much classes needed.