HTML5 browser can retrive the gps position of a computer. http://diveintohtml5.ep.io/geolocation.html
I would like to create an application that fakes a GPS device, but I couldn't read anywhere how the browser gets GPS data from the computer.
Your browser uses different types and sources of information to identify your location. These include your IP address, geolocation via HTML5 in your browser, and your PC's language and time settings.
How Chrome shares your location. If you let Chrome share your location with a site, Chrome sends information to Google Location Services to get an estimate of where you are. Chrome can then share that info with the site that wants your location.
Your browser knows your location because your location isn't determined based on information about IP Address in most cases. Window and most mobile devices use your access points around you to determine your location. The other possibility is the VPN is configured to leak your information.
Chrome and Firefox:
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