Re: [whatwg/dom] Declarative Shadow DOM (#831)

From @sebmarkbage: 

> My initial reaction is very positive. It will take a long time until this ships in enough browsers that we'll actually consider using it.
> We'd have to really shift the CSS strategy. Even then, I don't think we'd use shadow DOM as the *primary* encapsulation mechanism given the relative overhead on each level given that our components are so small and many. You might call them micro-components - you heard the buzzword here first.
> However, for larger encapsulation of large third party or legacy parts of an app inside another one this would be very useful as an alternative to iframes.
> I'd like to see this exist but probably won't make any immediate plans to adopt it.

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