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

There is at least one case when it is not possible - when you extending native elements. They have UA's ShadowRoot, but you don't neither have access to it, nor have ability to create new one on them, look at #376 for more discussion. Also this particular issue is exactly about avoiding performance overhead of creating Shadow Root (see the first message in this thread).

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