Interop 2026 Launches With Cross‑Browser Priorities From Apple, Google, Microsoft, Mozilla and Igalia

Overview

• The Interop group published its 2026 focus areas, aligning engineering and tests across major browsers to reduce web fragmentation.
• Priorities span core CSS and platform APIs, including attr(), contrast-color(), container style queries, custom highlights, dialogs and popovers, Fetch, IndexedDB getAllRecords(), JSPI for Wasm, media state pseudo-classes, the Navigation API, scoped custom element registries, scroll-driven animations, scroll snap, shape(), View Transitions, Web compat, WebRTC, and WebTransport.
• Microsoft Edge introduced a Top Developer Needs dashboard for long‑running interoperability issues and plans a refresh soon, while advocating for greater transparency in how focus areas are chosen.
• Participants also launched investigation efforts to expand testing infrastructure for accessibility, JPEG XL, mobile features, and WebVTT to prepare potential future focus areas.
• Interop 2025 closed with all participating browsers at or above a 98% score, and vendors pointed developers to the Interop 2026 dashboard and GitHub repository to follow progress.