This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
ondeviceproximity property of the
Window interface specifies an
EventHandler to receive
deviceproximity events. These events occur when the device sensor detects
that an object becomes closer to or farther from the device.
window.onuserproximity = funcRef
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