CSS FIzzBuzz
Knowing the answer to the FizzBuzz riddle when asked in an interview is supposedly the mark of a good programmer so here's how I'd do it in CSS.
li:nth-child(3n), li:nth-child(5n) {
list-style-type: none;
}
li:nth-child(3n):before {
content: "fizz";
}
li:nth-child(5n):after {
content: "buzz";
}
But if you think CSS isn't a real programming language this answer probably doesn't count.