It is supported and implemented by most modern browsers today, including Firefox, Internet Explorer, Safari, and Chrome.
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This is all processed by a computer server at Google HQ—the client itself just has an interface where they can interact with it.
The result would be an application that is unable to determine your location, crash frequently, and so on!
These contexts include the Window object, governed by the Window context, and Document objects associated with webpages, governed by the Document context.
Contexts also determine what kind of events specific code can react to. For example, Event Listeners in the Window context can only react to events related to window objects, whereas Event Listeners in the Document context may also be able to detect changes made within that webpage’s body tag.