Given that XSLT transforms XML into HTML, why has no one simply built a server side XSLT system? So these existing sites that use XSLT can just adopt that, and not need to rely on browser support.
They moved everything into a wiki later.
EDIT: Oh, their developers' manual is still done like that: https://github.com/gentoo/devmanual into https://devmanual.gentoo.org/
I specifically want it to be served as XML so it can still be an RSS feed: I don't even need the HTML to look that great: I have the actually website for that.