Re: [w3c/webcomponents] Observe ShadowRoot attachment (#204)

Any advice on how to efficiently polyfill this? Is patching of `attachShadow` the only way to do this?

I'm implementing the support of shadow dom for the [`inert` polyfill](https://github.com/WICG/inert/), and I need to observe shadowRoot creation and mutations in order to keep an inert element's content in the shadowDOM inert as well ([see issue](https://github.com/WICG/inert/issues/17) and [proposed solution with patching](https://github.com/WICG/inert/issues/17)).

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