Re: [w3c/webcomponents] ::slotted() should full support complex selector!! (#745)

> performance or functional, i prefer to first make it functional, then we talk the performance, otherwise, it is just a disability component

Thanks. Let me explain a brief history.
In Shadow DOM v0 era, we had a similar pseudo element "::content(selector)", where we support arbitrary selector. We preferred to make it functional. :)

However, it turned out that supporting arbitrary selector was the cause of performance issue here, we decided to introduce a new pseudo element, "::slotted()", for Shadow DOM v1. We learned and don't want to make it wrong again.

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