The API thankfully allows for users to cloak their location, and many implementations ask the user for permission before revealing the geolocation object to the JavaScript code.

The Mozilla Hacks blog has posted a nice screencast overview of the HTML5 Geolocation API. The video is designed to help anyone competing in Mozilla’s September developer derby (which involves ...

Most of the HTML and JavaScript in the example above is to make it easier to see the results. The most important line from a Geolocation API perspective is these lines: ...

Secondly, there's the Google Maps Geolocation API, which "enables an application or device to determine its own location without the use of GPS by looking up the locations of nearby WiFi access ...