The Proximity Events API detects the closeness of devices to objects and initiates appropriate reactions, such as shutting down a phone’s screen when it is close to a user's ear. Its sensors notify the browser of the device-object distance changes, which in turn responds with appropriate instructions for reacting to device and user proximity events. The API is compatible with only Firefox (Gecko) browser for desktop and Firefox Mobile (Gecko) browser for mobile. It is currently a beta release and subject to future changes.
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