Interop is a cross-browser initiative by Apple, Google, Igalia, Microsoft, and Mozilla that selects well-defined, stable web standard features with good test coverage for focused implementation. The project balances developer priorities gathered from surveys and bug reports with available engineering resources to choose a manageable subset of proposals. Progress is measured by pass-rates in Web Platform Tests and shown on the Interop dashboard. Interop 2025 raised the overall combined score from 25 to 95 and enabled features like Same-Document View Transitions, CSS Anchor Positioning, the Navigation API, CSS @scope, and the URLPattern API. The project also improved reliability in areas such as WebRTC, Flexbox, Grid, Pointer Events, and backdrop-filter and repeats the cycle annually.
"The group, including Apple, Google, Igalia, Microsoft, and Mozilla, takes proposals of features that are well defined in a sufficiently stable web standard, and have good test suite coverage. Then, we come up with a subset of those proposals that balances web developer priorities (via surveys and bug reports) with our collective resources. We focus on features that are well-represented in Web Platform Tests as the pass-rate is how we measure progress, which you can track on the Interop dashboard."
"Firefox started Interop 2025 with a score of 46, so we're really proud to finish the cycle on 99. But the number that really matters is the overall Interop score, which is a combined score for all four browsers - and the higher this number is, the fewer developer hours are lost to frustrating browser differences. The overall Interop score started at 25, and it's now 95."
Read at Mozilla Hacks - the Web developer blog
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