Tests the optional properties of DeviceProximityEvent. Each property should be null if not set, or set to null or undefined. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". event = document.createEvent('DeviceProximityEvent') PASS event.value == Number.POSITIVE_INFINITY is true PASS event.min == Number.NEGATIVE_INFINITY is true PASS event.max == Number.POSITIVE_INFINITY is true PASS successfullyParsed is true TEST COMPLETE