Re: [css-compositing] blending and inline SVG

On May 20, 2013, at 4:05 PM, Rik Cabanier <cabanier@gmail.com> wrote:

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> On Mon, May 20, 2013 at 3:42 PM, Dirk Schulze <dschulze@adobe.com> wrote:
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> On May 20, 2013, at 3:39 PM, Rik Cabanier <cabanier@gmail.com> wrote:
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> >
> >
> > On Mon, May 20, 2013 at 1:55 PM, Dirk Schulze <dschulze@adobe.com> wrote:
> >
> > On May 20, 2013, at 11:16 AM, Rik Cabanier <cabanier@gmail.com> wrote:
> >
> > > All,
> > >
> > > I was editing the chapter on isolation [1] and wondered if inline svg should happen in an isolated group. (So the <svg> tag would establish a new group/stacking context)
> > > It seems that it would be very hard to implement if this was not the case.
> > >
> > > Is everyone that inline SVG is always isolated?
> > >
> > > We also need to discuss what other constructs in SVG create isolation. The current filter spec assumes that nothing does, but that doesn't correspond with reality.
> >
> > The first question is how inline SVG cooperates with HTML in general. We did not specify that anywhere to my knowledge. In Blink and WebKit inline SVG elements are handled as replacement elements, same as <img>, <video> or <canvas>. It would make sense to not treat inline SVG elements different from the other elements for these two engines. However, I would like to understand where you see the technical difference to other "graphical" HTML elements like <div> or <p>.
> >
> > I'm unsure what you are asking.
> > Browser are indeed treating svg as a canvas (and not as a change from the css box model to the svg drawing model) so it makes sense to have the content isolated.
> 
> I was more revering to the sentence "It seems that it would be very hard to implement if this was not the case.". The question is why it would be harder for SVG. Treating SVG as replacement element is not necessarily a problem for not having an isolation group IMO.
> 
> Not neccesarily, but as you know, the graphics engines that the browser rely on, are not set up to deal with non-isolated groups.
> Do browsers create a new context when they see an inline SVG?  

Blink and WebKit do not create a new context at this point and the content could blend with it's backdrop at this point IIRC. I don't think that this is much different from Firefox.

Greetings,
Dirk

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>  
> The question is although: Should <video> always create an isolation group?
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> Does it matter? There is no visible content inside the video tag.

Received on Monday, 20 May 2013 23:27:47 UTC