W3C home > Mailing lists > Public > www-style@w3.org > December 2013

Re: [css-compositing] Request to move Compositing and Blending spec to CR

From: Nikos Andronikos <nikos.andronikos@cisra.canon.com.au>
Date: Fri, 13 Dec 2013 16:13:15 +1100
Message-ID: <52AA976B.7090405@cisra.canon.com.au>
To: <robert@ocallahan.org>, Rik Cabanier <cabanier@gmail.com>
CC: James Robinson <jamesr@google.com>, www-svg <www-svg@w3.org>, "www-style list" <www-style@w3.org>, "public-fx@w3.org" <public-fx@w3.org>
On 13/12/2013 2:29 PM, Robert O'Callahan wrote:
On Fri, Dec 13, 2013 at 4:13 PM, Rik Cabanier <cabanier@gmail.com<mailto:cabanier@gmail.com>> wrote:
No, the spec should not refer to blogs. Also, this is not 'potentially' useful as the absence of this description has caused confusion in the past.

I agree with James. Having the spec define behavior that is never used by any Web feature is very confusing.
I can see where the confusion is coming from.

The Blending and Compositing specification is intended to provide a general method for blending and compositing that can be applied in various places and so is comprehensive in it's description.
The draft originally included attributes/properties to control compositing in CSS and SVG but as these were lagging behind the mix-blend-mode property (which has implementations), it was felt that it was worth removing those and publishing incrementally in levels.
They will be back in level 2 and SVG (at a minimum) will use clip-to-self [1].

Another very important reason is also that if this property/behavior is included in the spec, the W3C patent policy will apply.
I might be totally wrong here, but since clip-to-self is not required to implement the level 1 spec, it seems like the patent policy would not apply to it anyway?

Describing something in a W3C spec that is not actually used by any features in that spec, just so we can get the patent policy to apply to it, borders on bad faith.

There was no intent to include clip-to-self just for that sake.

Cheers,
Nikos

1. An old draft that includes the 'alpha-compositing' property for SVG: http://www.w3.org/TR/2012/WD-compositing-20120816/#alpha-compositing

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Received on Friday, 13 December 2013 05:13:50 UTC

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