While at the Olympiad a number of people asked me what my normal job is. While at some previous Olympiads I could impress them with 'Roboticist', these days I am more of a web programmer (CMS systems being my thing). As a result I do like to play around with html and css, especially now they can create some pretty cool websites with nary a line of program code to make them work.
An example I came across is a rotating chess board, with the animation handled entirely by css. You can see a demo here, and the author is kind enough to list the html and css code that made it all happen.