Re: [pointerevents] Touch-action should distinguish between single- vs multi-finger panning

I think the most important thing here is that implementations of 
'pan-x pan-y' disallow two-finger panning for scenarios like the 
above.  Now that we have a [formal pinch-zoom 
definition](https://compat.spec.whatwg.org/#touch-action) that says 
explicitly "two finger panning and zooming" I think this is covered by
 a spec, and Chrome is just in violation of it.  We should add a test 
that Chrome fails but Edge passes.

Being able to explicitly toggle this behavior might be nice, but I 
haven't heard of any use cases where people want the Chrome behavior 
(IIRC it was just simpler for us to implement).  It would also be hard
 to spec (out of scope for PE charter) and pretty niche and so hard to
 get broad support for.  I suggest we only consider expanding 
touch-action syntax for this if major use cases come up.

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Received on Thursday, 5 January 2017 13:12:51 UTC