> the closest you could get to mapping html flexibility without the annoying XML verbosity Aka SGML. Though while you can hide those away in an external DTD,

> the closest you could get to mapping html flexibility without the annoying XML verbosity Aka SGML. Though while you can hide those away in an external DTD, SGML of course needs lots of markup declaration ([1]) for HTML "void" (empty) elements, tag inference, and enumerated attribute short forms, and then still more for markdown short references. [1]: https://sgmljs.net/docs/whatwg-html200129-dtd.html https://sgmljs.net/docs/whatwg-html200129-dtd.html