Jemima Abu, a senior product engineer and award-winning developer educator, shows how she replaced 150+ lines of JavaScript with just a few new CSS features.

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Modern CSS now handles complex interactions previously requiring JavaScript. New features like customizable select elements (appearance: base-select), scroll markers, tree counting functions (sibling-index, sibling-count), and typed attr() enable building interactive components with pure CSS. A practical example demonstrates replacing 150+ lines of JavaScript with CSS-only code for a fully styled, animated dropdown selector while maintaining native accessibility. These features are rolling out in Chrome 135+ but aren't production-ready yet across all browsers.

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