Interop 2026: The Cross-Browser Collaboration That’s Actually Working
Mozilla, Google, Apple, Microsoft, and Igalia are working together to fix the web. Here’s what’s coming.
The Core Insight
Interop 2026 is the latest iteration of cross-browser compatibility efforts—and it’s delivering real results. Firefox’s score went from 46 to 99; the overall interop score reached 95. The focus isn’t just new features—it’s making existing ones actually work reliably.
Why This Matters
Web development shouldn’t mean testing in five browsers and discovering different behavior everywhere. Interop’s collaborative approach has tangible impact on developer productivity—and it’s working.
Key Takeaways
- New features coming: Cross-document View Transitions, Scroll-driven animations, WebTransport, CSS container style queries, CSS custom highlights
- Reliability focus: Edge cases in Navigation API, CSS scroll snap, anchor positioning, View Transitions, WebRTC
- Investigations: Accessibility testing, mobile testing, JPEG XL, WebVTT
- The numbers: 20 focus areas, 33 proposals, overall score now 95 (up from 25)
- Mozilla’s commitment: “The only engine not owned by billionaires”—and still delivering
Looking Ahead
The interoperability story isn’t sexy, but it matters. Every percentage point improvement means fewer developer hours lost to browser quirks. Interop 2026 shows that even competitors can collaborate when the user experience is at stake.
Based on analysis of Mozilla Hacks Interop 2026 article