In case you're wondering what makes it tick:<p><a href="https://github.com/SLaks/Silon/blob/gh-pages/styles/basic-gates.css" rel="nofollow">https://github.com/SLaks/Silon/blob/gh-pages/styles/basic-ga...</a>
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...