Maybe one day someone will invent a rounder wheel.
The wheel is what I would call, passé.
Soon we'll be optimizing for minimizing the sides of a wheel (triangles are not the final form here...) /s
What are some of the ugly hacks you've seen that were applied?
[given what CSS has incrementally and inevitably become, it's my ever-firmer belief that DSSSL would've been the right choice in the first place]
Perhaps "WWW SPA document"? Using markdown with highly-progressive fenced blocks?
Hypertext (one word, coined 1960s) is quite a broad category. Subcategory "WWW" could fit, as TFA seems WWW-ish. A markdown document format, and progressive rendering of tags and code, seems HTML-like. Though with greater progressiveness - code blocks with streamed execution rather than merely compilation. The progressive JSON callbacks, React, integrated client and server code execution, and server-side rendering, seem closer to WWW SPA than to HTML. Though SPA files often seem more "source" than "document". And the multiple-page "App"-ness of SPA doesn't fit well. SPA seems a better fit than "full-stack". Perhaps some name analogous to "isomorphic javascript"...?
It embodies the whole idea of having data, code and presentation at the same place.
If you're open for contributions I already have an idea for cascading styles system in mind.