[w3ctag/design-reviews] Declarative Shadow DOM (#494)

Hello TAG!

I'm requesting a TAG review of Declarative Shadow DOM.

A declarative API to allow the creation of `#shadowroot`s using only HTML and no Javascript. This API allows Web Components that use Shadow DOM to also make use of Server-Side Rendering (SSR), to get rendered content onscreen quickly without requiring Javascript for shadow root attachment and population.

  - Explainer¹: https://github.com/mfreed7/declarative-shadow-dom/blob/master/README.md

  - Security and Privacy self-review²: https://github.com/mfreed7/declarative-shadow-dom/blob/master/Security_And_Privacy_Self_Review.md

  - GitHub repo (if you prefer feedback filed there): https://github.com/mfreed7/declarative-shadow-dom

  - Primary contacts (and their relationship to the specification):
      - Mason Freed (@mfreed7), Google / Chromium
  - Organization/project driving the design: Google / Chromium 
  - External status/issue trackers for this feature: https://www.chromestatus.com/features/5191745052606464


Further details:

  - [X] I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/)
  - The group where the incubation/design work on this is being done: WhatWG
  - The group where standardization of this work is intended to be done: WhatWG HTML spec
  - Existing major pieces of multi-stakeholder review or discussion of this design: https://github.com/whatwg/dom/issues/831

  - Major unresolved issues with or opposition to this design: Discussion is still underway, but we're mostly talking about smaller issues at this point.
  - This work is being funded by: Google / Chromium


We'd prefer the TAG provide feedback as:

  ☂️ open a single issue in [our GitHub repo](https://github.com/mfreed7/declarative-shadow-dom/issues) **for the entire review**

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