[css-compositing][css4-backgrounds] Updated to the blending and compositing

+www-style

On Dec 16, 2012, at 8:05 PM, "Rik Cabanier" <cabanier@gmail.com<mailto:cabanier@gmail.com>> wrote:



On Fri, Dec 14, 2012 at 10:13 AM, Dirk Schulze <dschulze@adobe.com<mailto:dschulze@adobe.com>> wrote:

On 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.

This wouldn't make it possible to blend at least multiple background images, right? This would be an interesting use case IMO (e.g water mark with a logo).

I agree that it would be very useful (and probably easy to implement).
However, I think that one should be in backgrounds and borders with a reference to the blending spec.

The first questions should be if and how.

Greetings,
Dirk



Rik

>
>
>>
>> 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
>