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

From: <bugzilla@jessica.w3.org>
Date: Fri, 19 Oct 2012 04:03:21 +0000
To: public-css-bugzilla@w3.org
Message-ID: <bug-15937-5148-R6BkKNUxaq@http.www.w3.org/Bugs/Public/>

--- 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

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

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