Must be seen to be believed

You need to be using Google Chrome (download link) to view this. If you don’t already have Chrome installed, it’s worth downloading to just see this video.

It demonstrates what can be done with HTML5 (among other things). Even the song is catchy.

Note: it’s best to close any open programs you have before you watch the video. It’s fairly resource heavy, and the more CPU and memory you can ‘spare’, the better.