Creating Animated Accordions with the Details Element and Modern CSS

Modern CSS allows creating fancy accordions without JavaScript using HTML details elements, new CSS properties like interpolate-size and transition-behavior, and the :has() selector. This enables interactive accordions with sliding animations and image transitions, including smooth height changes and automatic image switching based on open state. Although some features are currently Chromium-only, the approach offers progressive enhancement across browsers, simplifying implementation and reducing the need for custom JavaScript.