Re: [w3c/webcomponents] Provide a lightweight mechanism to add styles to a custom element (#468)

@emilio CSS Scoping you quoted says:
> The :host pseudo-class, when evaluated in the context of a shadow tree, matches the shadow tree’s shadow host. In any other context, it matches nothing.

means if `:host > span` is evaluated in the context of a shadow tree, `:host` matches its shadow host, and `>` means its immediate children (relationship), which traverses into its shadow tree because the context is the shadow tree, and then finds `span`.

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