January 2026 Baseline monthly digest

The January 2026 Baseline digest covers web platform features that reached new milestones. Newly available features include the :active-view-transition CSS pseudo-class, JavaScript modules in service workers, the Navigation API for SPAs, and four new root-relative CSS units (rcap, rch, rex, ric). Widely available features include the multi-keyword CSS display property syntax, the animation-composition CSS property, and JavaScript's non-mutating array methods (toReversed, toSorted, toSpliced).