[w3c/touch-events] Why don't Touch objects have offsetX and offsetY properties like MouseEvent does? (#62)

The [W3C CSSOM View Module draft defines](https://drafts.csswg.org/cssom-view/#dom-mouseevent-offsetx) `offsetX` and `offsetY` properties on the `MouseEvent` interface.

These seem very useful to me, and I want to be able to get the same value during touch events. When transforms are involved, calculating the equivalent position is very difficult (see [my related Stack Overflow question](http://stackoverflow.com/q/36373114/496046)).

[`Touch` objects](https://w3c.github.io/touch-events/#idl-def-Touch) don't define an equivalent, as far as I can see.

Is there a reason for this?

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