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if (window.PointerEvent) { ... } else { // use mouse events } should work just fine.
+1. Unless absolutely necessary tacking more properties on navigator should be avoided.
The Pointer Events WG discussed this bug on 10-Sep-2013 and the minutes from that discussion are <http://www.w3.org/2013/09/10-pointerevents-minutes.html#item04>.
Per 11/19 telecon resolution [1], I have removed pointerEnabled from the latest Editor's Draft [2]. [1]http://www.w3.org/2013/11/19-pointerevents-minutes.html#item04 [2] https://dvcs.w3.org/hg/pointerevents/raw-file/c16e5fe3ff87/pointerEvents.html