Re: [w3c/touch-events] Specify what browsers do on non-touch devices (#64)

For proximity, the spec says

> Not all devices contain a proximity sensor, and when there is no proximity sensor, this API is still exposed to the scripting environment but it does nothing.

Testing this in Firefox on my Surface 3 (which, as far as I know, doesn't have the relevant sensor) using https://www.audero.it/demo/proximity-api-demo.html the API is indeed exposed, but returns no meaningful data when queried.

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