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How do you even know? Don't those both just generate static html?

Footer. also Jekyll/Hugo sites use generator so you can mostly find it in the meta generator tag.

Next.js sites are also a super easy find like this.

You can trivially remove it e.g. `disableHugoGeneratorInject = true` in `config.toml`.

It says "Powered by Hugo" at the bottom of the page.

Depending on the theme.

I build my own themes and don’t include that either

Same here