Re: [webcomponents] Slots in a flat tree (#308)

In general, it's a good idea to minimize the number of new "magics" we introduce to the Web.  Being able to describe/de-sugar slot element's behavior in terms of `display: contents` would be "explaining" the platform and "building on top of primitives".  Introducing a shadow-DOM specific CSS box generation mechanism is anti-pattern in this regard (against the Extensible Web Manifest).

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