CSS easing curves are Bezier handles. If you have touched the pen tool, you already know the underlying mechanic.
The article maps the direct relationship between cubic-bezier() control points and the drag behavior designers use daily in vector tools. The value is in the translation: it gives developers a spatial, tactile mental model instead of an abstract numerical one.
Worth reading for the specific cubic-bezier() values it walks through and how it reframes easing not as a timing afterthought, but as a design decision with the same precision as any path you have ever drawn.
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