Apple’s WebKit blog published a post today highlighting the results of Interop 2025, an industry-wide effort to improve interoperability between different browsers. Here are the details.
“The Year of Convergence”
Interop is the result of a joint effort by Apple, Bocoup, Google, Igalia, Microsoft, and Mozilla to “improve interoperability in 15 key areas that will have the greatest impact on the experience of web developers.”
As Apple explains it:
“Each year, the Interop Project selects focus areas through a collaborative process of proposals, surveys of what web developers need, and debates about priorities. For Interop 2025, our team advocated for the inclusion of focus areas that we knew would require significant technical investment from WebKit—because we knew those areas could make a real difference to you. The results show that the commitment paid off from any browser to Safari4 in this year 3.”
In addition, Apple says there were roughly 20 focuses and areas of interest for Interop 2025 related to CSS, JavaScript, web APIs, and performance.

And while at the beginning of the year only 29% of selected tests passed across all browsers, by the end of the year that success rate had jumped to 97%, with “all four experimental browsers (Chrome Canary, Edge Dev, Firefox Nightly, and Safari Technology Preview) achieving 99%.”
In the post, Apple highlights and details three particularly meaningful areas of focus for Interop 2026, which were anchor placement, same-document view transitions, and navigation APIs.
Apple also lists other areas it has contributed to as part of Interop 2025, which includes all 19 areas of focus and five areas of investigation involving CSS and UI. @scope, backdrop-filterand text-decoration,API with Storage Access API, URLPatternand accessibility testing, Gamepad API testing, and mobile device testing.
To read Apple’s full post, click this link.
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