[w3ctag/design-reviews] WG New Spec: CSS-MIXINS-1 (Issue #1290)

thejohnjansen created an issue (w3ctag/design-reviews#1290)

### Specification

https://drafts.csswg.org/css-mixins/#defining-mixins

### Explainer

https://css.oddbird.net/sasslike/mixins-functions/

### Links

- The WG's request for this TAG review: Putting this on the Agenda for next week. We've discussed them with the TAG previous as part of the @functions dicussion (linked next)
- Previous early design review, if any: https://github.com/w3ctag/design-reviews/issues/1031
- An introduction to the feature, aimed at unfamiliar audiences: https://drafts.csswg.org/css-mixins/#defining-mixins
- A description of the problems that end-users were facing before this proposal: https://css.oddbird.net/sasslike/mixins-functions/#intro
- Examples of how to use the proposal to solve the end-users' problems: https://css.oddbird.net/sasslike/mixins-functions/#intro
- What do the end-users experience with this proposal: https://chromestatus.com/feature/5108022310469632
- User research you did to validate the problem and/or design, if any: https://github.com/w3c/csswg-drafts/issues/5798; https://front-end.social/@mia/110833306689188274
- Web Platform Tests: https://wpt.fyi/results/css/css-mixins/mixins?label=experimental&label=master&aligned


### The specification

- [x] Follows the [Web Platform Design Principles](https://www.w3.org/TR/design-principles/).
- [x] Includes Security and Privacy Considerations sections based on answers to the [Security/Privacy Questionnaire](https://www.w3.org/TR/security-privacy-questionnaire/).

### Where and by whom is the work is being done?

- GitHub repo: https://drafts.csswg.org/css-mixins/#defining-mixins
- Primary contacts:
  - @johnjansen, Microsoft, Product Manager; CSS-WG Co-Chair
  - @tabatkins, Google, Spec Editor
  - @kevinbabbitt, Microsoft, Software Engineer
- Organization/project driving the specification: CSSWG
- This work is being funded by: N/A
- Primary standards group developing this feature: CSSWG
- Incubation and standards groups that have discussed the design:
  - https://github.com/w3c/csswg-drafts/issues?q=is%3Aissue+state%3Aopen+CSS-Mixins-1


### Feedback so far

- Active horizontal reviews: https:// <!-- Link to an issue like https://github.com/webmachinelearning/webnn/issues/239, https://github.com/WebAssembly/spec/issues/1804, or https://github.com/w3c/did/issues/885, which itself links to the other horizontal reviews. If you haven't started the rest of the horizontal reviews, please consider doing so. -->
- Multi-stakeholder feedback:
  - Mozilla comments: https://github.com/mozilla/standards-positions/issues/1459
  - WebKit comments: https://github.com/WebKit/standards-positions/issues/727
- Major unresolved issues with or opposition to this specification: N/A
- Status/issue trackers for implementations: https://chromestatus.com/feature/5108022310469632


### You should also know that...

_No response_

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