History explains why HTML is now a living standard: https://whatwg.org/faq (Ctrl+F Living and keep reading).

> A published version of the standard NEVER, EVER, EVER, EVER changes.

WhatWG does have per-commit snapshots of the standard. They're just not semantically versioned because it is a living standard.

I think what the author wants is something like Gemini instead of HTML, but that has its own set of problems. My plea for Dillo would be to instead just support a text/markdown mime-type natively and we can try for adoption in more browsers.

> The objective is not to create a feature-by-feature clone of the Web, but to create an specification that allows humans to exchange knowledge, notes, and other forms of information without the imposed requirement of having to run a full blown VM to read it.

Markdown in browsers fits your objective! Only gotcha is commonmark extensions, and they can work with sub-type declarations in the mimetype.