Posted inFront-End

Browsers Achieve Near-Universal Web API Compatibility Under Interop Project

Posted inFront-End
Browsers Achieve Near-Universal Web API Compatibility Under Interop Project
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Major browser vendors have reported significant progress in cross-browser interoperability, reducing long-standing inconsistencies in how modern Web APIs behave across platforms.

The update comes from the Interop Project, a joint industry effort involving teams behind Chrome, Firefox, Edge, and Safari. The initiative tracks hundreds of Web Platform Tests (WPT) to measure how consistently browsers implement standardized web features.

According to the latest Interop 2025 results, participating browsers now pass nearly all targeted interoperability tests. Selected focus areas, including modern CSS features, navigation behavior, and core JavaScript APIs, reached compliance levels close to 97 percent by the end of the cycle. This marks a sharp improvement compared to early benchmarks, where less than one-third of tests passed across all engines.

For developers, this shift translates into fewer browser-specific workarounds, reduced reliance on polyfills, and more predictable behavior when using modern standards. Features that previously behaved differently across engines now show consistent results in production environments.

Browser teams attribute the progress to tighter collaboration, shared test suites, and faster feedback loops between specification authors and engine implementers. The work is ongoing, with Interop 2026 already underway and new focus areas identified for further alignment.

Overall, the update signals a structural improvement in the web platform. As interoperability gaps continue to close, developers can increasingly rely on standards-based code working uniformly across major browsers.

Source: https://9to5mac.com/2026/02/06/apple-highlights-cross-browser-compatibility-progress-in-2025/ https://planet.webkit.org/