[w3ctag/design-reviews] `prefers-reduced-transparency` CSS Media Query (Issue #881)

こんにちは TAG-さん!

I'm requesting a TAG review of CSS `prefers-reduced-transparency`.

The `prefers-reduced-transparency` media feature is used to detect if the user has requested the system minimize the amount of transparent or translucent layer effects it uses.

  - Explainer¹ (minimally containing user needs and example code): https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-reduced-transparency
  - Specification URL: https://drafts.csswg.org/mediaqueries-5/#prefers-reduced-transparency
  - Tests: https://github.com/web-platform-tests/wpt/blob/master/css/mediaqueries/prefers-reduced-transparency.html
  - User research: https://github.com/w3c/csswg-drafts/issues/443
  - Security and Privacy self-review²: https://gist.github.com/lukewarlow/f515062a03def6f214f7a1fad5446eb2
  - GitHub repo (if you prefer feedback filed there): n/a
  - Primary contacts (and their relationship to the specification):
      - Dean Jackson, Apple
      - [Florian Rivoal](https://github.com/frivoal), Invited Expert
      - [Tab Atkins Jr](https://github.com/tabatkins), Google
      - Daniel Libby, Microsoft
  - Organization(s)/project(s) driving the specification: 
       - [cookiecrook](https://github.com/cookiecrook) by implementing [this PR](https://github.com/w3c/csswg-drafts/pull/1709)
  - Key pieces of existing multi-stakeholder review or discussion of this specification:
      - [CSSWG GitHub Issue](https://github.com/w3c/csswg-drafts/issues/443)
      - [Intent to Prototype Firefox](https://groups.google.com/a/mozilla.org/g/dev-platform/c/l410J8odZjA/m/JdWVMNtSAQAJ)
      - [Intent to Prototype Chromium](https://groups.google.com/a/chromium.org/g/blink-dev/c/pWonDP0g9Q4/m/iSVel0aBBgAJ)
  - External status/issue trackers for this specification (publicly visible, e.g. Chrome Status):
      -  [Chrome Status](https://chromestatus.com/feature/5191066147356672)

Further details:

  - [x] I have reviewed the TAG's [Web Platform Design Principles](https://www.w3.org/TR/design-principles/)
  - Relevant time constraints or deadlines: n/a
  - The group where the work on this specification is currently being done: CSSWG
  - The group where standardization of this work is intended to be done (if current group is a community group or other incubation venue): CSSWG
  - Major unresolved issues with or opposition to this specification: adds a fingerprinting vector
  - This work is being funded by:



We'd prefer the TAG provide feedback as (please delete all but the desired option):

  💬 leave review feedback as a **comment in this issue** and @-notify @lukewarlow



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