Launching Interop 2025

The Interop Project is a collaboration between browser vendors and other platform implementors to provide users and web developers with high quality implementations of the web platform.

Each year we select a set of focus areas representing key areas where we want to improve interoperability. Encouraging all browser engines to prioritize common features ensures they become usable for web developers as quickly as possible.

Progress in each engine and the overall Interop score are measured by tracking the pass rate of a set of web-platform tests for each focus area using the Interop dashboard.

Interop 2024

Before introducing the new focus areas for this year, we should look at the successes of Interop 2024.

The Interop score, measuring the percentage of tests that pass in all of the major browser engines, has reached 95% in latest browser releases, up from only 46% at the start of the year. In pre-release browsers it’s even higher — over 97%.…