Re: [w3c/webcomponents] Support Custom Pseudo-elements (#300)

Say you're using an `<x-button>` component in your own shadow tree, and it exposes a "label" part that you'd like to expose as part of your own API. You can do `<x-button part="label => button-label">`, and now `::part(button-label)` will work on you, and target the `<x-button>`s `::part(label)`.

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