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onavailabilitychanged property of the
Bluetooth interface is an
EventHandler that processes
availabilitychanged events that fire when the Bluetooth system as a whole becomes available or unavailable to the User Agent.
Bluetooth.onavailabilitychanged = functionRef;
functionRef is the handler function to be called when the Bluetooth
availabilitychanged event fires.
The definition of 'Bluetooth' in that specification.