Re: Updated to the blending and compositing spec (was: minutes, December 10 2012, FXTF telcon)

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On Dec 30, 2012, at 1:20 AM, "Lea Verou" <lea@w3.org<mailto:lea@w3.org>> wrote:

Hi Rik,

Looks good to me.

One minor thing, I think <blendarea> = [<area>] <blendmode> should become:

<blendarea> = [<area>]? && <blendmode>

so that any order is permitted.

Btw, you can use the # combinator to avoid repetition, i.e. <blendarea>[, <blendarea>]* would become [<blendarea>]#.

The brackets can be omitted as well on single items.

Dirk


Lea Verou
W3C developer relations
http://w3.org/people/all#lea ✿ http://lea.verou.me ✿ @leaverou






On Dec 30, 2012, at 07:19, Rik Cabanier wrote:

Hi Lea,

I updated the spec. It still needs to be cleaned up a bit, but I believe that it reflects the latest proposal.
Can you take a look?

Rik

On Tue, Dec 11, 2012 at 3:34 PM, Rik Cabanier <cabanier@gmail.com<mailto:cabanier@gmail.com>> wrote:


On Tue, Dec 11, 2012 at 2:48 PM, Lea Verou <lea@w3.org<mailto:lea@w3.org>> wrote:
On Dec 12, 2012, at 00:40, Rik Cabanier wrote:

Hi Lea,

thanks for the clarification!

I don't particularly like that this forces you to always specify what part of the element you want to blend.
Most likely, 99% of blending will just target the element and now those users will have to write either 2 css properties or put 'element' in the shorthand.

It doesn’t :) `element` would just be the initial value for `mix-blend-area`, just like `normal` is for `mix-blend-mode`. I guess I should’ve mentioned that, but I assumed it was obvious. Mea culpa. :)

Ah! That makes sense.



How about we drop the '-area' property and assume in the shorthand that no area means that that blend should apply to the whole element?
So your case becomes:
mix-blend: screen, multiply box-shadow, multiply text-shadow;

Sounds like what I’m saying, without the longhands. The benefit of having the longhands is potential shorter code when you want the same blending mode to apply to multiple areas (check my example) and individual setting of the two components (area and blending mode), both of which are relatively rare I guess. The downside is more properties. No strong opinions here...

Yes, I don't think that it's very common to have the same blend mode on all the elements.
I believe that we're in agreement here and will update the spec accordingly unless someone voices an objection.

Rik