4 CSS Features Every Front-End Developer Should Know In 2026 · January 7, 2026
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Four modern CSS features shipped in 2025 enable powerful new capabilities: sibling-index() and sibling-count() for position-based calculations and staggered animations, scroll-state container queries for detecting stuck/snapped/scrollable states, text-box for trimming typographic whitespace to achieve pixel-perfect alignment, and typed attr() for passing type-safe values from HTML attributes to CSS with validation and fallbacks.
Table of contents
sibling-index() and sibling-count() #@container scroll-state() #text-box #typed attr() #Sort: