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

@robglidden This didn't answer my question, or if it did I didn't understand.  Sorry if this is wordy, I just want to be sure it's clear.   Specifically I am asking about this one line:

> I am hoping that the implementation blocker to https://github.com/WICG/webcomponents/issues/909#issuecomment-742851382 doesn't apply to layers, after all user-agent styles are already layer-like allowed in.

Given...

```html
<div class="foo">
   #shadowRoot
       <div class="bar">
          <button>Go</button>
       </div>
</div>
```

Assume that at some point we will be able to declaratively adopt stylesheets, maybe as @layers (I hope so)...Then it is possible for the page to provide a stylesheet with styles like 

```css
button { background: blue; color: white; }
.bar button { font-size: 2rem; }
```

And those would work fine in all browsers (if you do it functionally, this works today) because it's not really changing what a selector matches, the stylesheet is adopted and it is matching that selector within it's own shadow tree.

What would take a change is if you wanted to write a style that somehow considered _across_ the shadow boundary.  Are you suggesting that it should? How? With a new combinator? Magically as an effect of it being a shadow @layer?



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