Re: [w3c/webcomponents] Slots in a flat tree (#308)

Looking at WebKit I think right now slotted elements inherit from the parent of the `<slot>`, and webkit only respects display: none. That is doing `slot { display: block; }` has no effect. 

I'm very hesitant to ship with matching behavior, it doesn't seem like that's how display: contents was supposed to work. display: contents also has implications, for example are counters increments considered when declared on the slot? What about quoting level? Does slot::before and slot::after work? does display: contents display ::before? (I hope so).

I'd like to work out the details before we commit to making display: contents be a thing, and slot having a dependency on that technology. The current system is easy to explain, <slot> is just gone by the time styles are computed. There's no subtle rules for what does and does not apply.

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