I really like the paper, though I'm not sure the world needs another Turing-complete document language however well-motivated ;) As SGML pedant however, I can't resist commenting on the following: > The second offspring of SGML is XML, specified by the World Wide Web Consortium (W3C) in 1998. It has a reduced feature set compared to SGML (for example, it forbids unclosed tags and concurrent markup). But it retains th…
And in fact, in practice you could just use your own custom elements without worrying about validity and it’d mostly just work. This wasn’t even particularly rare. (There was the whole “CSS doesn’t work on them until you call document.createElement("…")” bug in IE, but that’s the only problem I can think of, and it was easily worked around.)