A deep dive into building a highly customized select dropdown using the new `appearance: base-select` CSS property. The implementation combines modern CSS features including anchor positioning, scroll-state queries, spring easing animations, and custom pseudo-elements with minimal JavaScript. Key features include automatic light/dark theming, RTL support, scroll-driven animations, sticky group headers, and progressive enhancement that falls back to native selects on unsupported browsers and mobile devices. The component maintains full accessibility through native browser controls while achieving a polished, modern aesthetic with superellipse corners and physics-based motion.
Table of contents
Core Architecture #Alignment & Positioning #Animation & Transitions #Theming & Color Handling #Layout & Spacing #Scrolling & Overflow #Customizable Select Features #Accessibility & UX #Performance Optimizations #Example Variations #Try It #Wrapping Up #Sort: