Wotcher TAG!

I'm requesting a TAG review of the linear() CSS 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/7508
• External status/issue trackers for this specification (publicly visible, e.g. Chrome Status):
  • https://bugzilla.mozilla.org/show_bug.cgi?id=1764126

Further details:

• I have reviewed the TAG's Web Platform 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