Apple’s WebKit blog published a post today highlighting the results of Interop 2025, an industry-wide effort to improve cross-browser interoperability. Here are the details.
‘A year of convergence’
Interop is the result of a joint effort between Apple, Bocoup, Google, Igalia, Microsoft, and Mozilla, which aims to “improve interoperability in 15 key areas that will have the most impact on web developer experience.”
As Apple explains it:
“Each year, the Interop project chooses its focus areas through a collaborative process with proposals, research into what web developers need, and debates about priorities. For Interop 2025, our team advocated for including focus areas that we knew would require significant engineering investment from WebKit — because we knew those areas would make a real difference to you. The results show that commitment paid off. Safari made the largest jump of any browser this year, climbing from 43 to 99.”
Moreover, Apple says that for Interop 2025, there were roughly 20 focus and interest areas related to CSS, JavaScript, Web APIs, and performance.
And while just 29% of the selected tests passed across all browsers at the start of the year, that pass rate skyrocketed to 97% at the end of the year, with “all four experimental browsers (Chrome Canary, Edge Dev, Firefox Nightly, and Safari Technology Preview) reached 99%.”
In the post, Apple highlights and details three particularly meaningful focus areas for Interop 2026, which were anchor positioning, same-document View Transitions, and Navigation API.
Apple also lists additional areas where it made contributions across Interop 2025, which includes all 19 focus areas and five investigation areas spanning CSS and UI with @scope, backdrop-filter, and text-decoration, APIs with Storage Access API, URLPattern, and accessibility testing, Gamepad API testing, and mobile testing.
To read Apple’s full post, follow this link.
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