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Re: [css3-images] Generalize the notion of 'invalid images' for image() fallback

From: Bert Bos <bert@w3.org>
Date: Wed, 7 Mar 2012 19:58:49 +0100
To: www-style@w3.org
Message-Id: <201203071958.49869.bert@w3.org>
On Tuesday 28 February 2012 02:22:12 Tab Atkins Jr. wrote:
> On Wed, Feb 22, 2012 at 10:57 AM, Tab Atkins Jr. 
<jackalmage@gmail.com> wrote:
> > This is something I meant to file on myself a while ago, but forgot
> > about. :/
> > 
> > Before this morning, the image() function only skipped an image if
> > it was a format that the UA couldn't decode or knew wasn't an
> > image. While addressing some LC feedback, I broadened this to also
> > skip an image if it's a URL that uses a fragment identifier syntax
> > the UA doesn't understand.
> > 
> > I'd like to slightly broaden this "invalid image" definition so
> > that other features can hook into it.  Specifically, I'd like to
> > allow element() to trigger fallback in image() if it hits one of
> > the "error" cases that currently produce a transparent image.  If
> > element() is used alone, it would still produce a transparent
> > image as currently specified; it would just trigger fallback if
> > used in image().
> > 
> > With an explicit hook, other sources of <image> could potentially
> > hook into this as well, though I'm not currently aware of anything
> > else that would want to.

You mean like linear-gradient() and radial-gradient()? Why wouldn't they 
make sense inside image()?

> > 
> > Any objections?
> 
> I've heard no objections since Wednesday, so I've made this change.



Bert
-- 
  Bert Bos                                ( W 3 C ) http://www.w3.org/
  http://www.w3.org/people/bos                               W3C/ERCIM
  bert@w3.org                             2004 Rt des Lucioles / BP 93
  +33 (0)4 92 38 76 92            06902 Sophia Antipolis Cedex, France
Received on Wednesday, 7 March 2012 18:59:19 GMT

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