Re: [WICG/webcomponents] "open-stylable" Shadow Roots (#909)

@robglidden 

> I am working on a project with declarative shadow DOM and cascade layers and it has changed my approach to this longstanding issue.

I hadn't considered this, and it's pretty clever.

> with declarative shadow DOM, selector shadow-crossing no longer needed

Maybe less needed, but I believe the core "it does not match" issue will come up, and the remaining problems are not just cascade related as it seems you're suggesting.

In particular, consider scope-crossing selectors for  **nested components** . For example, from your declarative stylesheet you might still want to match something that without shadow DOM would look like:

`.foo .bar button` 

if the actual structure within your declarative shadowRoot is more like:

 `my-element.foo #shadowRoot my-view.bar #shadowRoot button`


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