[w3ctag/design-reviews] Review request: linear() easing function (Issue #761)

Wotcher TAG!

I'm requesting a TAG review of [the linear() CSS easing function](https://drafts.csswg.org/css-easing-2/#the-linear-easing-function).

This is a custom easing function that allows easings to be defined by a series of points that are linearly interpolated. The idea is that this allows to approximate a lot of custom easings in a simple way. There's a lot more of background in https://github.com/w3c/csswg-drafts/issues/229.


  - Explainer¹ (minimally containing user needs and example code): See discussion linked above. This is a relatively simple feature that allows you to provide the points of an easing function and interpolate linearly between them.
  - Specification URL: https://drafts.csswg.org/css-easing-2/#the-linear-easing-function

  - Tests: https://wpt.fyi/results/css/css-easing?label=master&label=experimental&aligned&q=linear-timing

  - User research: N/A
  - Security and Privacy self-review²: This doesn't expose any new information.
  - GitHub repo (if you prefer feedback filed there): https://github.com/w3c/csswg-drafts/

  - Primary contacts (and their relationship to the specification):
      - Jake Archibald (@jakearchibald), Google
      - David Shin (@dshin-moz), Mozilla
      - Emilio Cobos Álvarez (@emilio), Mozilla
  - Organization(s)/project(s) driving the specification: N/A
  - Key pieces of existing multi-stakeholder review or discussion of this specification:
    - https://github.com/w3c/csswg-drafts/issues/229

    - https://github.com/w3c/csswg-drafts/issues/7533

  - External status/issue trackers for this specification (publicly visible, e.g. Chrome Status):
    - https://bugzilla.mozilla.org/show_bug.cgi?id=1764126


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: Not super urgent, but I think it should be a relatively straight-forward review, it is relatively simple and allows extension / further improvements.
  - The group where the work on this specification is currently being done: CSSWG
  - Major unresolved issues with or opposition to this specification: None, I think

We'd prefer the TAG provide feedback as (please delete all but the desired option):

  🐛 open issues in our GitHub repo for **each point of feedback**

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