The text and background colors are generated from the album artwork (like in yesterday's Panic post) using a modified version of the Color Thief library. More info about the demo here: <a href="http://thomaspark.me/2012/12/the-itunes-expanding-album-effect-in-css-js/" rel="nofollow">http://thomaspark.me/2012/12/the-itunes-expanding-album-effe...</a>
I shared it here: <a href="http://dot-js.com/posts/ed7625ba-1349-4330-8edf-4e888b25fff0" rel="nofollow">http://dot-js.com/posts/ed7625ba-1349-4330-8edf-4e888b25fff0</a>
Really cool animation. It seems like this could be done in pure HTML/CSS if you used the checkbox (radio button would probably work better) or (possibly) focus hacks.