[w3ctag/design-reviews] Layout Instability Metric (#393)

こんにちはTAG!

I'm requesting a TAG review of:

  - Name: Layout Instability Metric
  - Specification URL: https://wicg.github.io/layout-instability/

  - Explainer (containing user needs and example code)¹: https://github.com/WICG/layout-instability/blob/master/README.md

  - GitHub issues (if you prefer feedback filed there): https://github.com/WICG/layout-instability/issues

  - Tests: wpt/layout-instability (more coming soon)
  - Primary contacts (and their relationship to the specification): @skobes

Further details:

  - Relevant time constraints or deadlines: [please provide]
  - [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://docs.google.com/document/d/1hS6NEap7tIli4uou4Vf8A0c8BSbVo-yrxa9FwSc7DME/edit).
  - [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: WICG

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://discourse.wicg.io/t/proposal-layout-stability-metric/3187


  - Links to major unresolved issues or opposition with this specification:

https://github.com/WICG/layout-instability/issues


You should also know that...

- some tests are not yet in WPT
- some properties (hadRecentInput, lastInputTime) are not yet described in the spec

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

  - [X] 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 [github usernames]

--------------------------

_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/393