Re: [w3c/touch-events] Add touchType, altitudeAngle, azimuthAngle (Safari iOS 10.3 extensions for stylus) (#81)

ah, on re-reading it a few times (and referring to the language in https://developer.apple.com/reference/uikit/uitouch/1618131-azimuthangle) i think i'm getting it now. am i right in assuming that the Apple Pencil has no concept of "twist" (i.e. that both the `altitudeAngle` and  `azimuthAngle` remain unchanged if i simply spin the Pencil along its lengthwise/z axis while keeping its overall position/attitude towards the digitizer surface the same)?

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