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Re: CSS Charter

From: Erik Dahlström <ed@opera.com>
Date: Wed, 26 Mar 2008 12:33:44 +0100
To: "Maciej Stachowiak" <mjs@apple.com>, "Daniel Glazman" <daniel.glazman@disruptive-innovations.com>
Cc: www-style@w3.org
Message-ID: <op.t8mfqihpgqiacl@gnorps>

On Wed, 26 Mar 2008 08:12:23 +0100, Maciej Stachowiak <mjs@apple.com>  
wrote:

> On Mar 25, 2008, at 11:54 PM, Daniel Glazman wrote:
>
>> Maciej Stachowiak wrote:
>>
>>> I hope this information is helpful to the Working Group.
...

> 2) It would be unfortunate if using a filter intrinsically required  
> inserting presentational SVG markup in your document, or alternately  
> loading an additional external resource, for the filter specification.  
> At least for simple filters it seems desirable to be able to specify  
> them full in CSS without reference to additional markup defining the  
> filter.

Agreed, but what is a sufficiently simple filter?

> 3) It is not even clear to me if the SVG "filter" property is intended  
> to work with references to external documents. The SVG 1.1 spec does not  
> make this clear.

I find SVG 1.1 to be quite clear on this, the filter property value can be  
a <uri>[1] (further described in the uri reference definitions[2]). The  
only restriction is that it must point to an <svg:filter> element to be  
valid. It's explictly stated that uri:s can be both local and non-local.

> SVG 1.2 Tiny has a table with lots of clarifications, and many similar  
> references to specific kinds of elements are restricted to  
> same-document, but the table does not cover filters since they are not  
> in SVG 1.2 Tiny. In practice popular UAs often restrict such references  
> to same-document.

For reasons of simpler implementation sure, but it comes at little or no  
additional implementation cost when supporting the external references in  
svg in general.

Cheers
/Erik

[1] http://www.w3.org/TR/SVG11/filters.html#FilterProperty
[2] http://www.w3.org/TR/SVG11/struct.html#uriReferenceDefinition

-- 
Erik Dahlstrom, Core Technology Developer, Opera Software
Co-Chair, W3C SVG Working Group
Personal blog: http://my.opera.com/macdev_ed
Received on Wednesday, 26 March 2008 11:34:32 GMT

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