Re: Shadow tree style isolation primitive

On Jan 9, 2015 8:43 AM, "Anne van Kesteren" <annevk@annevk.nl> wrote:
>
> I'm wondering if it's feasible to provide developers with the
> primitive that the combination of Shadow DOM and CSS Scoping provides.
> Namely a way to isolate a subtree from selector matching (of document
> stylesheets, not necessarily user and user agent stylesheets) and
> requiring a special selector, such as >>>, to pierce through the
> boundary.
>
> This is a bit different from the `all` property as that just changes
> the values of all properties, it does not make a selector such as
> "div" no longer match.
>
> So to be clear, the idea is that if you have a tree such as
>
>   <section class=example>
>     <h1>Example</h1>
>     <div> ... </div>
>   </section>
>
> Then a simple div selector would not match the innermost div if we
> isolated the section. Instead you would have to use section >>> div or
> some such. Or perhaps associate a set of selectors and style
> declarations with that subtree in some manner.
>
>
> --
> https://annevankesteren.nl/
>

For clarity, are you suggesting you'd control the matching boundary via CSS
somehow or you'd need an indicator in the tree?  A new element/attribute or
something like a "fragment root" (sort of a shadowroot-lite)?