[w3ctag/design-reviews] [WebComponents] Custom state pseudo class (#428)

こんにちはTAG!

I'm requesting a TAG review of:

  - Name: ElementInternals's states property and the :state() pseudo class
  - Specification URL: N/A; The proposal will be a part of DOM/HTML/CSS specifications
  - Explainer (containing user needs and example code)¹: https://github.com/w3c/webcomponents/blob/gh-pages/proposals/custom-states-and-state-pseudo-class.md

  - GitHub issues (if you prefer feedback filed there): https://github.com/w3c/webcomponents/issues/738

  - Tests: N/A
  - Primary contacts (and their relationship to the specification): @rakina (an explainer author), @domenic (an explainer author), @tkent-google (implementer)

Further details:

  - Relevant time constraints or deadlines: No concrete deadlines, but we want feedbacks in a month.
  - [x] I have read and filled out the [Self-Review Questionnare on Security and Privacy](https://www.w3.org/TR/security-privacy-questionnaire/). The [assessment is here](https://github.com/w3c/webcomponents/pull/844/files?short_path=a981406#diff-a98140661e93c19281370b8c449001f1).
  - [x] I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/)
  - The group where the work on this specification is: [Web Components](https://github.com/w3c/webcomponents)

We recommend the explainer to be in [Markdown](https://github.github.com/gfm/). On top of the [usual information expected in the explainer](https://w3ctag.github.io/explainers), it is strongly recommended to add:

  - Links to major pieces of multi-stakeholder review or discussion of this specification: https://github.com/w3c/webcomponents/issues/738

  - Links to major unresolved issues or opposition with this specification: No major issues, and no opposition.

You should also know that...

N/A

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 [@rakina, @domenic, @tkent-google]


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