Bug in HTML5 localStorage implementation

There is bug in HTML5 localStorage implementation in webkit engine that allows websites to bypass localStorage limit and fill users disc entirely.

Everything about that it is described here: Introducing the HTML5 Hard Disk Filler™ API » Feross.org
And here is demo that shows how website may that bug and abuse localStorage: http://www.filldisk.com/
Tested on Comodo Dragon

All browsers based on webkit (including Comodo Dragon) are vulnerable and also Opera and Internet Explorer are too, but Opera asks user when website want to use more than 76MB if browser should allow it.