Test for CSS3 support in browser.

supports.js

var supports = (function(prop) {
    var
    div = doc.createElement('div')
    , vendors = 'Khtml Ms O Moz Webkit'.split(' ')
    ;

    return function (prop) {
        var len = vendors.length;

        if (prop in div.style) return true;

        prop = prop.replace(/^[a-z]/, function(val) {
            return val.toUpperCase();
        });

        while (len--) {
            if (vendors[len] + prop in div.style) {
                return true;
            }
        }

        return false;
    };
})();