Re: [w3c/webcomponents] Expose shadowRoot on element internals (#871)

@rniwa 

> attachShadow during custom element constructor returns the declarative Shadow DOM instead of creating one.

that seems a lot more complicated, `Element.prototype.shadowRoot` getter will return the instance during construction, and return `null` after the construction phase when declarative is closed. Sounds like hazardous for developers.

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