Re: [css3-background] 'background-size: auto auto' and images with intrinsic size in one dimension

On Mon, Aug 8, 2011 at 11:24 AM, Brian Manthos <> wrote:
> I forgot to mention this linkage in the chain of evaluation ...
> My recollection is that this explains how the percentages interact with the attachment location.
> My other recollection is that, although it's in SVG Tiny 1.2, it was the preferred model and that it was going to be moved or replicated somewhere else in spec land.
> Like I said, I'm fuzzy on this area but this combined with the other references led some of us (and definitely me) to the conclusion that we had no SVG-provided examples of the absence of intrinsic ratio during IE9 development.  And none of the new feature set of IE10 has shaken that understanding.

Read that section you linked again - it still agrees with what we've
said, and in fact does so in much clearer terms than SVG1.1 did.  In
particular, note this fragment: "Specifically, percentage values do
not provide an intrinsic width or height, and do not indicate a
percentage of the containing block. Rather, they indicate the portion
of the viewport that is actually covered by image data."

Thus, in the example I gave, there is no intrinsic height (as it took
the lacuna value of 100%), and there is no intrinsic aspect ratio (as
there was no viewBox, and one of the width/height values was a
percentage).  There is only an intrinsic width.


Received on Monday, 8 August 2011 19:25:22 UTC