It's also why LaTeX/PDF to HTML converters are so difficult to build, because the underlying engine has no semantic information about the structure (this may be changing with LLMs and multimodal setups).
You could simply use a static layout for your html, and then add borders or zoom (just like in a pdf viewer).
Then you'd have the editability, accessibility and performance of html, with the same responsiveness as a pdf (none).
I've never really given this much thought, but html could reallly become the standard file format for documents.
True, but... we were very good at building unresponsive websites in the early 2000s. Can't we just return to tradition and disable a lot of the responsive behaviour that we've layered onto HTML with an off-the-shelf stylesheet? Hardcode some width properties, ya know? (This is not a rhetorical question, genuinely curious).
But "H" in "HTML" is for "Hyper(text)", which really talks about the interactivity. And then you get a really bad language for typesetting that simply lacks a gazillion features of true typesetting systems like TeX or even Typst.
It is much trickier if you are using tikz heavily, but it still doable.