NOTE: The following instructions describe working with an iPhone, but they work just as well with an iPad or iPod. Once connected to your iOS device from your Mac, you can easily debug your web site just as you would if you were testing a web site locally.
NOTE: If you do not have any web page open on your iOS device, you will see a message saying “No Inspectable Applications”.
You will now see the iOS device you connected to your Mac. On recent versions of iOS (v6 and up), Apple offers a remote debugger for your iPhone, iPod or iPad’s Safari web browser. This post describes how to set one up, connected to your phone so you can figure out what went wrong. When we were testing our implementation of Apple Pay on our iPhones, we found a few issues where we needed a proper debugger.