[w3ctag/design-reviews] [CSS-Values-4] FYI review of Allow infinity, -infinity and NaN in CSS calc() (Issue #708)

Braw mornin' TAG!

I'm requesting a TAG review of Allow infinity, -infinity and NaN in CSS calc().

Per the Chromium Intent to Ship, [it was requested that I file a TAG review as a FYI](https://groups.google.com/a/chromium.org/g/blink-dev/c/C-qitIHpE9o/m/6ZRog-2KEAAJ) - hence this request.

- Explainer: https://github.com/DevSDK/calc-infinity-and-NaN/blob/master/explainer.md

- Specification URL: https://www.w3.org/TR/css-values-4/#calc-error-constants

- Tests: 
  * https://wpt.fyi/results/css/css-values/calc-infinity-nan-computed.html

  * https://wpt.fyi/results/css/css-values/calc-infinity-nan-serialize-angle.html

  * https://wpt.fyi/results/css/css-values/calc-infinity-nan-serialize-length.html

  * https://wpt.fyi/results/css/css-values/calc-infinity-nan-serialize-time.html

  * https://wpt.fyi/results/css/css-values/calc-catch-divide-by-0.html

  * https://wpt.fyi/results/css/css-values/animations/calc-interpolation.html

- Primary contacts (and their relationship to the specification):
  - Seokho Song, (@DevSDK), Chromium Community Contributor
- Organization(s)/project(s) driving the specification: W3C/CSSWG
- External status/issue trackers for this specification (publicly visible, e.g. Chrome Status): https://chromestatus.com/feature/5657825571241984


Further details:
  - [x] I have reviewed the TAG's [Web Platform Design Principles](https://www.w3.org/TR/design-principles/)

You should also know that...

[please tell us anything you think is relevant to this review]

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 @DevSDK


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