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

`:host ` was born and shipped in Blink before we realize that we need a selector to select all nodes that are shadow hosts here. Given that, I am afraid that we can not have ideal naming sets here. That's the technical debt.

Thus, `:potentially-custom` and `:has-shadow-root` look promising to me.
However, I am okay with `:potentially-custom` and `:shadow-host`. Yeah, having `:host` and `:shadow-host` is confusing, but I would like to use `:shadow-host` here...




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