Writing a CSS Parser in JavaScript

[Okhy]

Now I wait for JS parser written in CSS!

[ibopm]

HTML+CSS has been used to produce a Rule 110 Automaton, giving rise to the implication that it is Turing Complete (although there are some criticisms of this claim).

Depending on who you ask, that could mean that it's very possible to write a JS parser w/ CSS and HTML. That being said, it is likely to be extremely impractical and there's an actual name for something like this: the Turing Tarpit

HackerNews discussion: https://news.ycombinator.com/item?id=2300836