[w3ctag/design-reviews] _FYI_ Review of CSS Fonts 4 `font-palette`and `@font-palette-values` (Issue #719)

Braw mornin' TAG!

### Review Request

I'm requesting a TAG review of `font-palette`and `@font-palette-values` and intent to inform the TAG about the existing plans to ship this feature in two engines, see below.

  - Explainer¹: https://github.com/w3c/csswg-drafts/pull/7138 & https://github.com/drott/csswg-drafts/blob/paletteExplainer/css-fonts-4/palette-explainer.md

  - Specification URL: https://www.w3.org/TR/css-fonts-4/#font-palette-prop

  - Tests: https://wpt.fyi/results/css/css-fonts?label=master&label=experimental&aligned&q=palette

  - User research: 
  - Security and Privacy self-review²: https://www.w3.org/TR/css-fonts-4/#security

  - Primary contacts (and their relationship to the specification):
      - @drott, @litherum, @svgeesus
  - Organization(s)/project(s) driving the specification: Google, Apple
  - Key pieces of existing multi-stakeholder review or discussion of this specification:
     - Previous issues ([non-exhaustive list](https://github.com/w3c/csswg-drafts/issues?q=is%3Aissue+font-palette)) that @litherum, @drott and @svgeesus discussed while WebKit and Blink were implementing this.
  - External status/issue trackers for this specification (publicly visible, e.g. Chrome Status):
    - https://chromestatus.com/feature/5674031696052224

    - [Mozilla Standards Position Request](https://github.com/mozilla/standards-positions/issues/617) and [tracking bug #1461588](https://bugzilla.mozilla.org/show_bug.cgi?id=1461588)
    - [WebKit Tracking Bug #230446](https://bugs.webkit.org/show_bug.cgi?id=230446) and [Safari 15.4 Beta Release Notes](https://developer.apple.com/documentation/safari-release-notes/safari-15_4-release-notes)

Further details:

  - ✅ I have reviewed the TAG's [Web Platform Design Principles](https://www.w3.org/TR/design-principles/)
  - The group where the work on this specification is currently being done: CSS WG
  - The group where standardization of this work is intended to be done: CSS WG
  - Major unresolved issues with or opposition to this specification: None that I knew off.
  - This work is being funded by: Google, Apple

You should also know that...

### Real word example
There's a polyfilled example of custom palette usage at https://underware.nl/fonts/plakato/features/color/ where font foundry Underware hosts their Plakato Color Grade experiment.

### Shipping intentions
Safari publishes this feature in their [Safari 15.4 Beta Release Notes](https://developer.apple.com/documentation/safari-release-notes/safari-15_4-release-notes), indicating a plan to ship this soon. 
For Blink @drott posted an [intent-to ship](https://groups.google.com/a/chromium.org/g/blink-dev/c/clspafOtM4Y/m/STns5fSEAAAJ) as well. So two engines are planning to ship this feature in the near future.

### Feedback Channel

We'd prefer the TAG provide feedback as comments on this issue.



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