function prefixed(obj, property) {
	    var prefix, prop;
	    var camelProp = property[0].toUpperCase() + property.slice(1);
	
	    var i = 0;
	    while (i < VENDOR_PREFIXES.length) {
	        prefix = VENDOR_PREFIXES[i];
	        prop = (prefix) ? prefix + camelProp : property;
	
	        if (prop in obj) {
	            return prop;
	        }
	        i++;
	    }
	    return undefined;
	}
get the prefixed property
@param {Object} obj
@param {String} property
@returns {String|Undefined} prefixed