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

@domenic 
You should use `:shadow-host` in `<style>` in the same component tree as the target shadow host,
while `:host` has to be used from inside its shadow root.

Thus if a document has several shadow dom components, one `:shadow-host` rule can match all the shadow hosts, while `:host` has to be used in each component.

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