2 CSS interpolate-size Examples: Animate Auto Height
Animating layout shifts requires native smoothness. The CSS interpolate-size examples in this updated collection remove the friction of transition constraints, enabling animations to and from intrinsic sizing keywords like auto. Utilizing these curated snippets eliminates the need for JavaScript calculation hacks. Direct animation. No bloat. No technical noise.
The logic relies on interpolate-size: allow-keywords applied to root or parent container elements. This enables the layout engine to interpolate values like height or width smoothly. Transitions leverage hardware acceleration, ensuring 60fps performance on the rendering thread. The HTML structure remains strictly semantic, maintaining high layout stability without breaking accessibility or DOM structures.
Every free demo is designed for modern browser environments. Users can instantly download the raw code or fork a specific layout on CodePen. These assets are optimized for performance, delivering a fast, transparent UI design experience across all modern devices.
Examples
Smooth Accordion with Parallax Images
An advanced semantic accordion using native <details> elements synchronized with a parallax image gallery. Height transitions are made fluid through modern interpolate-size: allow-keywords and complex linear() bounce easings. JavaScript connects active toggles to external navigation buttons, aligning the active image block to match disclosure states. (Requires: gsap.js, tweakpane.js)
Chrome 129+
Edge 129+
Firefox 121+
Safari 17.2+
See the Pen Smooth Accordion with Parallax Images.
Exclusive Accordion with Tailwind and interpolate-size
A high-performance, smooth accordion that expands to the content’s natural height, looking and feeling like a complex JS solution but running entirely on the browser engine.