[w3ctag/design-reviews] Default accessibility semantics for custom elements (#401)

こんにちはTAG!

I'm requesting a TAG review of:

  - Name: Default accessibility semantics for custom elements
  - Specification URL: https://github.com/whatwg/html/pull/4658, https://github.com/w3c/aria/pull/984

  - Explainer (containing user needs and example code)¹: https://github.com/alice/aom/blob/gh-pages/explainer.md#per-instance-dynamic-semantics-via-the-elementinternals-object

  - Tests: none yet
  - Primary contacts (and their relationship to the specification): @alice @domenic @tkent-google @rakina

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 one of the primary contacts above

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_Please preview the issue and check that the links work before submitting._ In particular, if anything links to a URL which requires authentication (e.g. Google document), please make sure anyone with the link can access the document.

¹ For background, see our [explanation of how to write a good explainer](https://w3ctag.github.io/explainers).


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https://github.com/w3ctag/design-reviews/issues/401