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): Custom pseudo-classes for host elements via shadow roots (:state) WICG/webcomponents#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.
• I have read and filled out the Self-Review Questionnare on Security and Privacy. The assessment is here.
• I have reviewed the TAG's API Design Principles
• The group where the work on this specification is: Web Components

We recommend the explainer to be in Markdown. On top of the usual information expected in the explainer, it is strongly recommended to add:

• Links to major pieces of multi-stakeholder review or discussion of this specification: Custom pseudo-classes for host elements via shadow roots (:state) WICG/webcomponents#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
• leave review feedback as a comment in this issue and @-notify [@rakina, @domenic, @tkent-google]