[Bug 17591] [Shadow]: Should insertion point nodes have styles?

https://www.w3.org/Bugs/Public/show_bug.cgi?id=17591

--- Comment #2 from Takashi Sakamoto <tasak@google.com> 2012-06-26 10:54:10 UTC ---
Thank  you for answering.

(In reply to comment #1)
> (In reply to comment #0)
> > According to the shadow dom spec:
> > http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#styles,
> > insertion point nodes have styles:
> > 
> > - the styles of the insertion point node are inherited by those child nodes of
> > the shadow host that are assigned to this insertion point
> > - the styles of the shadow insertion point node are inherited by the child
> > nodes of the shadow root of the shadow DOM subtree, distributed to this shadow
> > insertion point
> 
> I think there's a bug in spec here. What we need to convey is that the styles
> of the parent of the insertion point are inherited.

I see. 

> > I think, this behavior looks natural for web developers.
> > 
> > However, the spec also says:
> > "To enable composition of shadow host's children and the shadow DOM subtree, a
> > notion of insertion points is added to the abstraction. An insertion point is a
> > defined location in the shadow DOM subtree, to which the shadow host's children
> > are transposed when rendering."
> > in
> > http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#shadow-dom-subtrees
> > 
> > So no insertion point nodes appear in a composed tree. If insertion point nodes
> > have styles and the styles are inherited by distributed nodes, styles of nodes,
> > which are not in a composed tree, will affect rendering result. I think, it
> > looks a little odd.
> 
> Right.
> 
> > 
> > The following is an example:
> > 
> > <div>
> >    <span>This is an example.</span>
> > </div>
> > 
> > And a shadow root is attached to the div and the shadow root's innerHTML is:
> > 
> > <div>!!!!
> >   <content style="color: red"></content>
> > !!!!</div>
> > 
> > What color is the text: "This is an example."?
> 
> The color should be whatever the color of <div> in the shadow DOM subtree is.
> style="color:red" is not used.

I see. The color of <div>, the parent of the insertion point node, is applied.

> However, we could consider that a <content> element does have styles, but has
> the initial style of display:contents and thus is not rendered. If the
> developer chooses to surface the <content> element, they could give it a
> different "display" value. This seems more flexible and less magical. However,
> we need to have "display:contents" spec'd in CSS first.
> 
> Bug 16294 is related to this.

I will look at the bug.

Best regards,
Takashi Sakamoto

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Received on Tuesday, 26 June 2012 10:54:17 UTC