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6 posts · webkit.org
Safari 27.0 adds a local MCP server for AI‑driven automation, a fully stylable `<select>` via `appearance: base-select` and new pseudo‑elements, the `<model>` element for embedding 3D assets, `sizes="auto"` for responsive images, a `shadowrootslotassignment` attribute for declarative shadow roots, and a large set of quality‑focused fixes (844 resolved issues).
Safari Technology Preview 252 adds several WebKit platform updates, including new CSS features like named-feature() in @supports and unprefixed user-select, plus bug fixes across accessibility, animations, HTML, and JavaScript. The release also corrects worker termination, Promise.try behavior, and line‑clamp rendering, which can affect Safari‑targeted web apps.
WebKit invites the community to submit Interop 2027 focus‑area proposals, emphasizing testability and existing standards. Submissions should be specific, impactful, and include links to specs and tests, and must be filed as GitHub issues by Sep 23 2026.
Safari’s module loader was rewritten in C++ to follow the ECMAScript spec, fixing ordering and uninitialized‑export bugs that broke top‑level await. The new loader passes test262, WPT, and a custom fuzzer, and restores reliable module loading performance.
Safari Technology Preview 251 introduces new CSS features like `@supports at-rule()` and `object-view-box`, alongside new JavaScript capabilities including `Iterator.prototype.includes()` and WebAssembly Memory64. This release also includes numerous bug fixes across HTML, CSS, and Canvas, and deprecates several non-standard CSS properties.
Safari Technology Preview 250 ships a batch of web‑platform updates, including new JavaScript resource‑management syntax, several CSS properties, streaming fetch bodies, and WebAssembly SIMD extensions. It also fixes a range of accessibility, rendering, and networking bugs.
