- From: Tab Atkins Jr. <jackalmage@gmail.com>
- Date: Sat, 15 Mar 2014 09:49:33 -0700
- To: Steve Orvell <sorvell@google.com>
- Cc: www-style list <www-style@w3.org>
On Fri, Mar 14, 2014 at 10:01 AM, Steve Orvell <sorvell@google.com> wrote: > This section (http://dev.w3.org/csswg/shadow-styling/#shadow-trees) defines > the `active shadow tree`, but the spec does not mention the importance this > has for styling. The spec does say, > > "The descendants of a shadow host must not generate boxes as normal. > Instead, the contents of the active shadow tree generates boxes as if it > were the contents of the element instead." > > It's unclear to me if "generate boxes" is connected with the application of > a stylesheet. Regardless, the spec needs to clarify the following behavior. This is me hooking into the in-the-process-of-acquiring-spec-language concept of the box tree. Elements generate boxes, which generate fragments, which are rendered. If you don't generate boxes, you don't do anything - this is what display:none does. On Fri, Mar 14, 2014 at 1:00 PM, Steve Orvell <sorvell@google.com> wrote: > Upon further reflection, I think it would be better if the `active shadow > tree` and the <shadow> element had *no influence* on whether or not a > stylesheet applies. > > Instead, all stylesheets in all sibling shadowRoots should always apply. This is what the spec currently says, so that's good. ^_^ > For > rules without :host, there would be no detectable change since the styles > are still scoped to individual shadowRoots. However, there are implications > for the :host selector since it reaches up to the host element. In > particular, this means if there's a :host rule in an older shadowRoot, it > always applies to the host element. > > I believe 90% of the time, this will be what the author wants. In the case > where it's not, the onus is on the author to override the :host styling in > the younger shadowRoot. This seems like a good tradeoff. Just to make sure - multiple shadow roots can style the host element, but they can't style elements in other shadow roots. Assuming this is true, then yeah, this is already implied by the spec. ~TJ
Received on Saturday, 15 March 2014 16:50:22 UTC