[Bug 15937] Clarify that units in the matrices are CSS pixels (editorial)

https://www.w3.org/Bugs/Public/show_bug.cgi?id=15937

--- Comment #10 from Dirk Schulze <dschulze@adobe.com> ---
After reading the discussion on this bug, I still think a normative phrase is
simpler and still more exact then adding a matrix with px and 1/px. 

""
One translation unit on ''matrix()'' and ''matrix3d()'' is equivalent to 1
pixel in the local coordinate system of the ancestor element.
""

I don't think that we need too mention 1/pixel, since it falls out of the
calculation. The text to perspective already describes the relation to
translation values. See "3D rendering context"[1].

Any concerns? Otherwise I add it to matrix on the mathematical description
section.

[1] http://dev.w3.org/csswg/css3-transforms/#transform-3d-rendering

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