> XSLT lets you build completely static websites without having to use copy paste or a static website generator to handle the common stuff like menus.

How many people ever do this?

Skip parses plain text, markup and Markdown to HTML with XSLT.

REPO: https://github.com/gregabbott/skip

DEMO: https://gregabbott.pages.dev/skip

(^ View Source: 2 lines of XML around a .md file)

If this is "declarative XSL Processing Instructions", apparently 0.001% of global page loads.

I did that. You can write .rst, then transform it into XML with 'rst2xml' and then generate both HTML and PDF (using XSL-FO). (I myself also did a little literate programming this way: I added a special reStructuredText directive to mark code snippets, then extracted and joined them together into files.)