ISSUE-2383: Last Call Comment: pAR on image, and defer

par image defer

Last Call Comment: pAR on image, and defer

State:

RAISED

Product:

SVG 1.1 F2 Last Call

Raised by:

Chris Lilley

Opened on:

2010-10-12

Description:

http://lists.w3.org/Archives/Public/www-svg/2010Oct/0047.html

Hi www-svg,

I'm writing to request a modification to the SVG 1.1 spec, to clear up
an inconsistency.

The inconsistent sections are quoted at the bottom of this post.

The inconsistency is as follows:
- The <image> documentation[1] says that the referenced SVG root node's
preserveAspectRatio attribute is "ignored". It doesn't mention any
exceptions to this rule.
- BUT, the preserveAspectRatio documentation[2] says that this
attribute might **not** be ignored -- in particular, if we have
<image preserveAspectRatio="defer" ...>
then the root node's preserveAspectRatio value will be honored.

Please consider editing the <image> documentation to be less absolute
(and more consistent with the preserveAspectRatio documentation).

For example, the <image> documentation[1] could be modified to say
something like:
> When an ‘image’ element references an SVG image, the
> clip and overflow properties on the root element in the
> referenced SVG image are ignored. The ‘preserveAspectRatio’
> attribute on the root element might also be ignored, depending
> on the value of the ‘image’ element's ‘preserveAspectRatio’
> attribute -- see the ‘preserveAspectRatio’ documentation
> for more details.

(I'm not sure if 'might' is the right word above -- sadly I'm not fluent
in spec-speak. :))

Thanks!
Daniel Holbert
Mozilla Corporation

[1] Section 5.7, on image:
> When an ‘image’ element references an SVG image the
>‘preserveAspectRatio’ attribute as well as the clip
> and overflow properties on the root element in the
> referenced SVG image are ignored
http://www.w3.org/TR/SVG11/struct.html#ImageElement

[2] Section 7.8, on preserveAspectRatio:
> If the value of ‘preserveAspectRatio’ on an ‘image’
> element starts with 'defer' then the value of the
> ‘preserveAspectRatio’ attribute on the referenced
> content if present should be used.
http://www.w3.org/TR/SVG11/coords.html#PreserveAspectRatioAttribute

Related Actions Items:

• ACTION-2881 on Chris Lilley to Add wording to the specification to address issue raised in Inconsistency about preserveAspectRatio for <image> element - due 2010-10-19, closed

Related emails:

1. SVG/profiles/1.1F2/DoC disco.xsl,1.4,1.5 dump.html,1.3,1.4 (from cvsmail@w3.org on 2011-05-04)
2. SVG/profiles/1.1F2/master struct.html,1.30,1.31 (from cvsmail@w3.org on 2010-11-29)
3. Re: inconsistency about preserveAspectRatio for <image> element (from chris@w3.org on 2010-11-29)
4. SVG/profiles/1.1F2/master struct.html,1.29,1.30 (from cvsmail@w3.org on 2010-11-29)
5. status update (from cam@mcc.id.au on 2010-11-25)
6. Agenda Nov 18 2010 SVG WG telcon (from ed@opera.com on 2010-11-17)
7. Minutes, 12 Oct 2010 SVG WG telcon (from chris@w3.org on 2010-10-12)
8. Re: inconsistency about preserveAspectRatio for <image> element (from dholbert@mozilla.com on 2010-10-12)
9. Re: inconsistency about preserveAspectRatio for <image> element (from chris@w3.org on 2010-10-12)
10. ISSUE-2383 (par image defer): Last Call Comment: pAR on image, and defer [SVG 1.1 F2 Last Call] (from sysbot+tracker@w3.org on 2010-10-12)

Related notes:

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