Apple Calls for Developer Input on Browser Interoperability for Interop 2027
Tech giant seeks proposals to enhance cross-browser compatibility in next year's initiative.
1Interop 2027 Initiative Launch
Apple's WebKit team has opened submissions for Interop 2027, the latest edition of their cross-browser compatibility project. Running from September 3-23, 2024, this call invites developers to propose areas needing standardization. The initiative builds on previous successes where interoperability test pass rates jumped from 29% to 97% across browsers. Proposals must address mature web standards with measurable testing potential.
2Collaborative Tech Industry Effort
Since 2022, Apple has partnered with Google, Microsoft, Mozilla, and tech organizations through the Interop program. This annual collaboration identifies 15-20 key web technology areas needing standardization. The project evolved from the earlier Compat initiative, proving so successful it became a recurring effort. Each year's focus areas are selected based partly on developer community input.
32025's Remarkable Progress
Earlier this year, WebKit revealed Interop 2025 achieved 97% test pass rates across browsers, up from just 29% at year's start. This dramatic improvement covered 20 focus areas including CSS features, Navigation API, and WebRTC. The results demonstrate how concentrated industry collaboration can rapidly solve long-standing web compatibility issues affecting developers and users globally.
42026's Technical Focus Areas
For Interop 2026, the consortium selected 20 technical areas spanning modern web technologies. These include View Transitions, WebTransport, and various CSS capabilities. The choices reflect both current web development pain points and emerging standards needing broader implementation. Many selections originated from developer proposals during last year's open call period.
5Proposal Requirements
Apple specifies Interop 2027 proposals must address mature, testable web standards - excluding nascent technologies. Each submission should demonstrate why the area matters, how current inconsistencies affect developers/users, and the technology's adoption level. The company emphasizes proposals must stand independently, as reviewers may lack context about previous years' submissions.
6Submission Guidelines
Developers can submit proposals via GitHub issues or support existing ones with constructive comments. Apple discourages duplicate submissions, recommending collaboration on existing ideas instead. The company provides detailed guidelines, stressing proposals should clearly prioritize why their focus area deserves attention over other potential candidates in the competitive selection process.
7Testing Infrastructure Importance
A key Interop requirement involves measurable progress through Web Platform Tests. Technologies lacking sufficient testing infrastructure may qualify as Interop Investigations instead. This emphasis on quantifiable results ensures the initiative delivers concrete improvements. Automated testing allows consistent progress measurement across all participating browsers throughout the year.
8Industry-Wide Impact
The Interop initiative represents a rare case of tech competitors collaborating to solve shared challenges. By standardizing critical web technologies across browsers, it reduces development overhead and improves user experiences. The program's success demonstrates how structured industry cooperation can advance web standards faster than individual company efforts.