On Jun 14, 2013, at 10:42 AM, Ian Hickson <[email protected]> wrote:

> I think before we add more features, it's important that we figure out 
> which browsers want to implement which features, and that we start with 
> the highest priority ones.

I think that is exactly the point of Rik's mail. Figure out if people are 
interested and get the propriety of this feature. I think this is a very 
important part and I would like to see blending and filters on groups. I think 
using layers is the way to go for that. It is also the way graphic libraries 
group elements internally for graphical operations. I checked CG, Cairo 
Graphics, Rik checked Direct2D/3D and it is possible to implement there. Brian 
confirms that Skia does it the same way. (As a matter of fact, if it wouldn't, 
it would never have been possible to run WebKit/Blink on top of Skia.)

So other than a lot of the not implemented parts of the spec, this is something 
that can be implemented cross browsers. As you say, the question is just if 
browser vendors will support it.

Greetings,
Dirk

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