Nonetheless, nice work on theming a native checkbox so well. I'd love to use it if it were cross-browser compatible.
It looks like it's relying on the webkit-only "-webkit-appearance" property, as you can see here: http://jsfiddle.net/DArcMattr/uhwQp/1/show/
edit: added an attempt at making it cross-browser
Nonetheless, nice work on theming a native checkbox so well. I'd love to use it if it were cross-browser compatible.