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

@mirisuzanne:

> I think it's a good idea to allow layering of external styles, but dangerous to use layers as the way we define access to those styles. I think @scope would be a much better control for defining what styles are pulled in - and then layers could be used on both ends to help define the cascade of those styles when applied.

Separate from syntax, I am not sure I fully understand.

To me, "access" couldn't happen at either the layers or scope proximity step in the cascade.  It must happen before, I assume in the context step, and would pass first through the element-attached styles (style attribute in cascade 6) step.

So [to me](https://github.com/WICG/webcomponents/issues/909#issuecomment-1971878378), between an attribute syntax and @layer syntax, an @layer syntax just seems more intuitive because it states access and priority in a single declarative syntax, though not a single operation, and other syntaxes could be fine too.  But I assume a web browser implementor might look at this differently.

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