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

The implication of the case 1+ above is that once you attach a shadow root, then `:host > span` starts to indicate the direct children of shadow root which is `<span>`. 

The actual `<span>Hello World</span>` is still a child of shadow host, and even though it is slotted to appear as if it's a child of `<my-element>`, it's not an immediate child of the shadow root, therefore `:host > span` selector doesn't match.

I hope we are on the same page.

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