You can implement an adder in CSS? Somehow this reminds me of C++ templates. These things seem to gain power and have new features until they become turing-complete. And beyond...
I still say that doesn't count as long as you have to make the user click on all the cells. CSS by itself is capable of doing a single row of rule 110, but that's not enough.
It's not really any surprise that templates (or CSS) could be Turing complete, as all the lambda() function does is the same thing a template does - replacing the macros in a template with an argument.
This is actually an important lesson that is often missed: if the app you're writing gives the anonymous users any kind of find/replace macro capability, you're giving them a fully Turing complete language (though it's probably not easy, but that rarely stops anyone) and all the potential problems that can bring.
haha, thats a funny thought. I like CSS. I would love for it to have variables so I could consolidate changes and edit them via JS. Sorta like all the CSS-libraries.