[w3ctag/design-reviews] Portals (#331)

こんにちはTAG！Bonjour le TAG!

I'm requesting a TAG review of:

  - Name: Portals
  - Specification URL: [very early draft](https://rawcdn.githack.com/KenjiBaheux/portals/a71dced7dac5aca657b2aa63d47c00c2d80a403e/index.html)
  - Explainer, Requirements Doc, or Example code: [explainer](https://github.com/KenjiBaheux/portals/blob/master/explainer.md), [use cases](https://github.com/KenjiBaheux/portals/blob/master/key-scenarios.md), [design considerations](https://github.com/KenjiBaheux/portals/blob/master/design-discussion.md)
  - Tests: N/A
  - Primary contacts: @KenjiBaheux, @jeremyroman, @lucasgadani

Further details (optional):

  - Relevant time constraints or deadlines: early feedback highly appreciated.
  - [ ] I have read and filled out the [Self-Review Questionnare on Security and Privacy](https://www.w3.org/TR/security-privacy-questionnaire/).
  - [ ] I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/)

You should also know that...

 - Background for this work:
  - [TAG finding](https://www.w3.org/2001/tag/doc/distributed-content/)
  - [AMP blog post](https://www.ampproject.org/latest/blog/standardizing-lessons-learned-from-amp/)
  - [WICG thread](https://discourse.wicg.io/t/proposal-for-promotable-iframe/2375)
 - [Demos at Chrome Dev Summit](https://www.youtube.com/watch?v=Ai4aZ9Jbsys&t=17m00s) with a prototype: this might help understand some of the use cases.
 - There is an experimental implementation in Chrome but it's missing key features. We expect to have something useful behind the flag in a couple of weeks.


We'd prefer the TAG provide feedback as (please select one):

  - [ ] open issues in our Github repo for each point of feedback
  - [ ] open a single issue in our Github repo for the entire review
  - [x] leave review feedback as a comment in this issue and @-notify: KenjiBaheux, jeremyroman, lucasgadani (because the repo is temporary)


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