[greggman3]

I believe the reason there's no if/else is because CSS is supposed to be easy enough to interpret relatively quickly (in a finite amount of time). The moment you add if/else you'd up with a full programming language and the halting problem and an arbitrary amount of calculations before the system can finally know what to render.

[valenterry]

So what's the issue here? Why is this not a problem for Javascript but for CSS?

In the worst case just put a 3sec limit on the evaluation and stop it if it doesn't complete in time, problem solved.

[cal85]

You solved the halting problem!

[erezsh]

I think that would require while/recursion? Afaik ifs are very quick to calculate.