GoKawiilApple’s WebKit team is inviting developers to submit their ideas for Interop 2027, the next edition of the cross-browser initiative aimed at improving web interoperability. Here are the details.
A bit of context
Over the past few years, Apple has collaborated with Google, Microsoft, Mozilla, Bocoup, and Igalia on Interop, an annual effort to make modern web technologies work more consistently across different browsers.
The project began in 2022, building on the earlier Compat initiative, with participating browser makers and organizations identifying 15 key areas where interoperability issues were creating problems for web developers. While Compat was originally conceived as a one-off effort, it proved successful, and Interop has returned every year since.
Each year, the group selects a new set of focus areas, based in part on proposals from the web development community. Browser makers then work to improve their implementations in those areas, with progress measured through a shared set of Web Platform Tests.
Earlier this year, the WebKit team shared the results of Interop 2025, which saw the percentage of selected tests passing across all browsers jump from just 29% at the beginning of the year to 97% by the end.
They also outlined the 20 focus areas selected for Interop 2026, spanning CSS features and technologies such as the Navigation API, View Transitions, WebRTC, and WebTransport, partly based on proposals submitted by the web development community during last year’s open call.
Which brings us to this year’s open call, which officially opened on September 3 and will accept proposals through September 23.
Interop 2027 entries now open
Apple says that proposals must be based on mature web standards and be testable, since nascent technologies aren’t ready to become Interop Focus Areas, and the project relies on automated Web Platform Tests to measure progress across browsers. The company also notes that technologies that lack sufficient tests or testing infrastructure should instead be proposed as Interop Investigations.
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