[w3ctag/design-reviews] `prefers-reduced-data` CSS Media Query (Issue #705)

Braw mornin' TAG!

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

This feature indicates explicit user opt-in for a reduced data experience that when communicated to origins allows them to deliver alternate content honoring such preference - e.g. smaller or no images, less/no web fonts, smaller video resources, alternate markup, etc.

  - Explainer¹ (minimally containing user needs and example code): https://github.com/w3c/csswg-drafts/issues/2370

  - Specification URL: https://www.w3.org/TR/mediaqueries-5/#prefers-reduced-data

  - Tests: https://github.com/web-platform-tests/wpt/blob/master/css/mediaqueries/prefers-reduced-data.html

  - User research: https://github.com/w3c/csswg-drafts/issues/2370

  - Security and Privacy self-review²: https://github.com/w3c/csswg-drafts/issues/4832

  - GitHub repo (if you prefer feedback filed there): n/a
  - Primary contacts (and their relationship to the specification):
      - [Adam Argyle](https://github.com/argyleink), Google
      - [Yoav Weiss](https://github.com/yoavweiss), Google
  - Organization(s)/project(s) driving the specification: 
    - [HJ Chen](https://github.com/huijing) with [this PR](https://github.com/w3c/csswg-drafts/pull/4575)
  - Key pieces of existing multi-stakeholder review or discussion of this specification:
    - [CSSWG Github issue](https://github.com/w3c/csswg-drafts/issues/2370)
    - [Intent to Prototype](https://groups.google.com/a/chromium.org/g/blink-dev/c/oNJTem41LBs/m/CA4Nx05aAwAJ)
    - [Related TAG review of saveData](https://github.com/w3ctag/design-reviews/issues/204)
  - External status/issue trackers for this specification (publicly visible, e.g. Chrome Status):
    - [Chrome Status](https://chromestatus.com/feature/5922192355229696)

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: Google is implementing and [HJ Chen](https://github.com/huijing) did the spec work

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 @argyleink and @yoavweiss

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