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

@TakayoshiKochi @emilio 

I think what you might want to take a look is [3.2.1. Matching Selectors Against Shadow Trees](https://drafts.csswg.org/css-scoping/#selectors-data-model) and [3.2.2. Selecting Shadow Hosts from within a Shadow Tree](https://drafts.csswg.org/css-scoping/#host-element-in-tree), instead of [3.2.3. Selecting Into the Light: the :host, :host(), and :host-context() pseudo-classes](https://drafts.csswg.org/css-scoping/#host-selector).

I think 3.2.1 and 3.2.3 explains well.


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