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

From: <bugzilla@jessica.w3.org>
Date: Sun, 29 Apr 2012 14:19:25 +0000
To: public-css-bugzilla@w3.org
Message-Id: <E1SOUyD-0007td-By@jessica.w3.org>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=15937

--- Comment #6 from Dirk Schulze <dschulze@adobe.com> 2012-04-29 14:19:24 UTC ---
(In reply to comment #5)

> I don't think we need to say this explicitly.  Instead, we should say how the
> matrices are used to transform coordinates, and make it clear that the input
> and output coordinates are in pixels.  The units of the matrix entries will
> follow from that without having to introduce confusing and unhelpful stuff like
> 1/px explicitly.

I fully agree. Introducing units for matrices, just to clarify how they are
supposed to work is more confusing. But it is more than pixels. How does a
matrix reflect a rotation or skewing that use <angle>?

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