Javascript Super Mario Kart

I can't believe it, the author finished this game only by Javascript. I tried it, it runs smoothly. He also provided your the source code with a small size 11Kb.
Now, try this game.

The author said:

So far, it's just racing. No weapons or any of that fancy stuff. At the moment, you can choose from 3 different drivers (Mario, Luigi and Princess Peach) and 2 different maps (Mushroom Cup Round 1 and 2). There is no lap count, no timer and no finish. You can just race around forever and try to beat the others (it's not hard, especially if cut a few corners). The AI is rather crude, but seems to work ok for the time being.

There is (simple) collision detection against the boundaries of the map and the colored "blocking" blocks, but not against the karts, so you can't crash into the other drivers. Drive safely, anyway!

SOURCE