Plaintext
I like plain text and simple HTML sites because they’re fast, open, and will run on pretty much anything. Plain text is also Lindy. You can view plain text and plain HTML sites on a Kindle. You can view them on vintage computers, especially easily with tools like 68k news and frog find from Action Retro.
The no css club is be too puritan for my tastes, but you might like it! I’m sure you’ve seen motherfucking website, but I think this is far more usable.