Man, I can understand people writing Firefox-hating demos if they're trying to show off some feature that recently landed in WebKit, I can almost understand it if they just did a weekend-hack and couldn't be bothered testing in any browsers other than their own.

I can't understand this - in 2013, how on earth do you break mouse events in JavaScript? We've had events like onmousedown working reliably across browser implementations for a decade or more, what on earth is going on?