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Spec
http://rawgit.com/w3c/touch-events/master/touchevents.html#touch-interface
Summary
Enable the unprefixed version of the touch rotation angle attribute in Touch Events spec extension. Touch.rotationAngle gives the orientation (clockwise in degrees) of the elliptical touch surface described by Touch.radiusX and Touch.radiusY.
Link to “Intent to Implement” blink-dev discussion
Is this feature supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?
Yes.
Demo link
https://plus.google.com/+RickByers/posts/EcxNyw5WHg8
Debuggability
Developers can easily check the attribute through devtools, as in the case for other Touch attributes.
Compatibility Risk
Low. The prefixed version of the attribute (Touch.webkitRotationAngle) is available since M39.
OWP launch tracking bug?
Link to entry on the feature dashboard
N/A.
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Have you investigated whether it's appropriate to try to remove the prefixed one and replace with non-prefixed in one release? 0.02% is low.
Have you seen any interest from other browsers in implementing this? This isn’t on our roadmap at the moment and I hadn’t seen signs from Mozilla or Apple either.
-Jacob