css3prop.js

var css3prop = (function () {
    'use strict';

    function dashedToCamelCase(string) {
        return string.replace(/(\-[a-z])/g, function($1) {
            return $1.charAt(1).toUpperCase();
        });
    }
    function camelCaseToDashed(string) {
        return string.replace(/([A-Z])/g, function($1) {
            return '-' + $1.toLowerCase();
        });
    }
    
    var css3prop = {};
    var map = {};

    css3prop.js = function (property) {
        if (!property) {
            return undefined;
        }
        if (property in map) {
            return map[property];
        }
        
        var result = undefined;

        var style = document.documentElement.style;
        if (property in style) {
            result = property;
        } else {
            var vendors = ['ms', 'Moz', 'Webkit', 'O'];
            var suffix = property.charAt(0).toUpperCase() + property.slice(1);
            for (var i = 0; i < vendors.length; ++i) {
                var prop = vendors[i] + suffix;
                if (prop in style) {
                    result = prop;
                    break;
                }
            }
        }

        map[property] = result;
        return result;
    };
    
    css3prop.css = function (property) {
        var result = css3prop.js(dashedToCamelCase(property));
        if (result) {
            result = camelCaseToDashed(result);
            return (result.substring(0, 3) === 'ms-') ? '-' + result : result;
        }
        return undefined;
    };
    
    return css3prop;
}());