Re: [webcomponents] Composition Algorithm shouldn't unwrap slots (#308)

> We don't need to revise this sentence. Instead, we have to redefine the composition algorithm:
> https://w3c.github.io/webcomponents/spec/shadow/#composition-algorithm

We need to revise it because nodes assigned to a slot should inherit its CSS value from its parent in the light DOM (shadow host), not from the parent in the composed tree (slot into which it is assigned).

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