> WHATWG’s officially recommended[1] ways of keeping up are commit history (quite messy), Twitter feed (primarily channeling commit history as it seems), and—I kid you not—manual diffing of Git revisions.

That is mostly meaningful for browser makers and Web authors that want to interact with the development of the HTML specification.

Web developers that simply want to make things are rather encouraged to search MDN and caniuse.com[0], which provide information about the availability and potential quirks of HTML features across browsers, and link to sections of the appropriate specifications.

[0]: https://github.com/whatwg/html/blob/f8f9c6c222ce79c2f8df1855...