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Re: [css3-images] Images with an intrinsic aspect ratio and exactly one of an intrinsic height or width

From: L. David Baron <dbaron@dbaron.org>
Date: Wed, 14 Mar 2012 16:44:03 -0700
To: "Tab Atkins Jr." <jackalmage@gmail.com>
Cc: www-style@w3.org
Message-ID: <20120314234403.GB22221@pickering.dbaron.org>
On Wednesday 2012-03-14 14:54 -0700, Tab Atkins Jr. wrote:
> On Wed, Mar 14, 2012 at 2:04 PM, L. David Baron <dbaron@dbaron.org> wrote:
> > The prose in http://dev.w3.org/csswg/css3-images/#default-sizing
> > (5.3, Default Concrete Object Size Resolution) seems to assume that
> > if an image has an intrinsic aspect ratio, it either has neither or
> > both of an intrinsic width and height.
> That's not an assumption, it's a basic fact.  You can't have only two
> of them; the third is automatically determined by the other two.
> Should I make this more obvious somehow?
> > However,
> > http://www.w3.org/TR/2011/REC-SVG11-20110816/coords.html#IntrinsicSizing
> > certainly defines cases where there's an intrinsic aspect ratio
> > (from a viewBox) and only one of an intrinsic width or height.
> What cases are these?

An SVG image that has a viewBox attribute and a non-percentage value
for exactly one of the height or width attributes.

It's reasonable to want to describe such an image as having both an
intrinsic width and an intrinsic height, but if you want that to be
the case, something should say so.  (I'd suggest putting it in the
definition of "intrinsic dimensions" in 5.1 (Object-Sizing


𝄞   L. David Baron                         http://dbaron.org/   𝄂
𝄢   Mozilla                           http://www.mozilla.org/   𝄂
Received on Thursday, 15 March 2012 03:54:28 UTC

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