As more and more people visit your website with mobile devices, you’re going to need all the help you can get to figure out what the user’s device is. Sometimes you’ll need browser side detection for whatever reason and this function should return the device they’re running on according to the user agent string pulled from the browser. If you’re not seeing anything in the result panel, it’s because you’re viewing it on the desktop. The function will come handy when you hit the wall with Media Query.