[w3ctag/design-reviews] CSS if() function (Issue #1045)

こんにちは TAG-さん!

I'm requesting a TAG review of CSS if() function.

"The if() notation is an [arbitrary substitution function](https://drafts.csswg.org/css-values-5/#arbitrary-substitution-function) that represents conditional values. Its argument consists of an ordered semi-colon–separated list of statements, each consisting of a condition followed by a colon followed by a value. An [if()](https://drafts.csswg.org/css-values-5/#funcdef-if) notation represents the value corresponding to the first condition in its argument list to be true; if no condition matches, then the if() notation represents an empty token stream." (From the spec.)

  - Explainer¹: https://docs.google.com/document/d/1mbHBUR40jUBay7QZxgbjX7qixs5UZXkdL9tVwGvbmt0/edit?usp=sharing
  - Specification: https://drafts.csswg.org/css-values-5/#if-notation
  - WPT Tests: 
  - User research: 
  - Security and Privacy self-review²:
  - GitHub repo: https://github.com/w3c/csswg-drafts/tree/main/css-values-5
  - Primary contacts:
      - @tursunova, Google, working on the feature in Chromium.
  - Organization/project driving the specification: Chromium
  - Multi-stakeholder support³:
    - Chromium comments: Positive.
    - Mozilla comments: https://github.com/mozilla/standards-positions/issues/1167
    - WebKit comments: https://github.com/WebKit/standards-positions/issues/453
  - Status/issue trackers for implementations⁴: https://issues.chromium.org/issues/346977961

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:
  - 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 different from the current group): CSSWG
  - Major unresolved issues with or opposition to this specification:
  - This work is being funded by:


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