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

Hi, this should not be standard, since it is rather a hydration technique that can be easily adopted by any library, [please analyze the example attached in the documentation](https://github.com/mfreed7/declarative-shadow-dom/blob/master/README.md#feature-detection-and-polyfilling), it should generate the polyfill in connectedCallback and not in the constructor.

**I think the standards associated with the web should not cover the SSR**, this is the work of libraries.

Summary: as a technique it is excellent and I think I'll adopt it [atomico](https://github.com/atomicojs/atomico) , but not this should be a standard

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