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Re: Updated filters specification

From: Erik Dahlstrom <ed@opera.com>
Date: Tue, 26 Apr 2011 09:20:29 +0200
To: "Rik Cabanier" <cabanier@gmail.com>, "Dean Jackson" <dino@apple.com>
Cc: robert@ocallahan.org, "Dirk Schulze" <vbs85@gmx.de>, public-fx@w3.org, "Anthony Grasso" <anthony.grasso@cisra.canon.com.au>
Message-ID: <op.vujaofmkgeuyw5@localhost>
Deprecating (or dropping) 'enable-background' would essentially mean that  
BackgroundImage and BackgroundAlpha would always generate a transparent  
black result in the context of filters (I presume this is what the  
browsers that don't support enable-background already do, and it follows  
the error handling that is defined for when there was no  
"enable-background:new" parent element). Typically that means that things  
still render without errors but probably not as intended by the author.

I think that we'd still need to keep some wording there to say what  
'enable-background' is/was for the BackgroundImage/BackgroundAlpha cases,  
but I'd prefer to keep it short and to link to SVG 1.1 for the full  
definition. How does that sound?


On Tue, 26 Apr 2011 02:50:11 +0200, Dean Jackson <dino@apple.com> wrote:

> What does this mean for existing content that uses 'enable-background'?  
> I doubt there is much of it, but still, there are a couple of existing  
> recommendations that define it. Typically things get deprecated before  
> being removed.
> Dean
> On 22/04/2011, at 1:59 PM, Rik Cabanier wrote:
>> I guess this means that section 7 can be completely removed.
>> Rik
>> On Wed, Apr 20, 2011 at 9:21 PM, Robert O'Callahan  
>> <robert@ocallahan.org> wrote:
>> On Thu, Apr 21, 2011 at 12:54 AM, Dirk Schulze <vbs85@gmx.de> wrote:
>> Am 20.04.2011 um 09:41 schrieb Erik Dahlstrom:
>> > As much as I like having backwards compatibility with SVG 1.1 this is  
>> one of the things I'm happy to drop from the spec. The reason for that  
>> is that few implementations support enable-background anyway, and  
>> there's very little content that depends on it. And as you said, it's  
>> possible to find workarounds. For example one can use feImage to pull  
>> in some subtree as the filter input image.
>> >
>> > Any objections to dropping 'enable-background' from the filters spec?
>> I definitely support dropping 'enable-background' from Filter!
>> Me too!
>> Rob
>> --
>> "Now the Bereans were of more noble character than the Thessalonians,  
>> for they received the message with great eagerness and examined the  
>> Scriptures every day to see if what Paul said was true." [Acts 17:11]

Erik Dahlstrom, Core Technology Developer, Opera Software
Co-Chair, W3C SVG Working Group
Personal blog: http://my.opera.com/macdev_ed
Received on Tuesday, 26 April 2011 07:21:11 UTC

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