Re: [webcomponents] Should shadow host have `display: block` by default? (#426)

I see. I wish we could use `:host` to select all nodes that are shadow hosts, and `:ancestor-host` or `:closest-host` or something to select the host element of the current shadow tree. Maybe that does not match the terminology well though.

In general I think these are good ideas and it would be best to just come up with names. I suggest `:potentially-custom` for the one that selects elements with valid custom element names, but do not have any good suggestions for the host situation. `:host` and `:shadow-host` together are too confusing IMO.

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