CSS Easing Functions Level 1 published as Candidate Recommendation! w3.org/blog/CSS/2019/05/02/c… This spec is very stable and well-implemented already, hopefully can get to REC soon!
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CSS easing determines the speed of an animation or transition; how it speeds up at the start, and slows down at the end. Check out this pen (one out of many other ones) which demonstrates the predefined easing functions: codepen.io/KeenanC/pen/EqHbp via @CodePen

May 6, 2019 · 4:10 PM UTC

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The #CSS easing module gives keywords and other syntaxes to use inside the #transition and #animation properties. Smooth #timing/easing functions correlate a time ratio to an output ratio, both expressed as <number>s.
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Check out the current browser compatibility at developer.mozilla.org/en-US/… and do not hesitate to suggest an edit for this specification: github.com/w3c/csswg-drafts/…