Launching Interop 2026 – Mozilla Hacks - the Web developer blog
Hacker News
February 13, 2026
AI-Generated Deep Dive Summary
Mozilla's Interop 2026 initiative aims to enhance web platform compatibility by focusing on a curated set of features and improvements that address developer needs. The project, led by major browser vendors including Apple, Google, Microsoft, and Mozilla, prioritizes proposals based on developer feedback, bug reports, and standards alignment. This year, over 150 proposals were reviewed, with 20 focus areas and 4 investigation topics selected for implementation across browsers. Key new features include Cross-document View Transitions, which enable seamless animations across documents without JavaScript, and Scroll-driven Animations, designed to reduce reliance on heavy JavaScript solutions by leveraging scroll position for dynamic effects.
The initiative also emphasizes improving the reliability of existing web technologies. In Interop 2025, significant progress was made in areas like WebRTC, CSS Flexbox, and Grid, with a focus on reducing inconsistencies and enhancing test coverage. The overall Interop score increased from 25 to 95, reflecting a substantial reduction in browser compatibility issues that cost developers time and effort. However, challenges remained, such as features passing tests but behaving inconsistently across browsers due to ambiguous specs or poorly aligned test cases.
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Originally published on Hacker News on 2/13/2026