"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."
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.
Read at Mozilla Hacks - the Web developer blog
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