The new CSS corner-shape() property is mathematical, so it’s easily animated. Author Daniel Schwarz pokes at animating the property for interesting UI effects.

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A hands-on exploration of combining CSS scroll-driven animations with the new `corner-shape` property (Chrome 139+). Covers animating `superellipse()` values tied to scroll position, using `mix-blend-mode: difference` for color inversion effects, masking techniques with `corner-shape: notch`, integrating scroll snapping, and animating multiple nested `corner-shape` elements. Includes practical code snippets and tips for refining animation start/end points by extending shapes beyond the viewport.

Experimenting With Scroll-Driven corner-shape Animations