This is why you shouldn't trust unknown websites!
Like this one...
Joking... joking...
This video descibes how the website works by demonstrating the functionality of it.
Then, I also elaborate on how geolocations are obtained with respect to Internet Service Providers.
Lastly, I demonstrate the HTML and Javascript used to create this latitude/longitude coordinate output used on this website.
Side Note: I had to finish off the video rather quickly to not go over 5 minutes, but everything is explained.