# Safari Technology Preview 212 Release Notes Learn about the latest web technology updates in Safari Technology Preview: Authentication, Canvas, CSS, Forms, JavaScript, Loading, Networking, SVG, Text, Web API, and Web Inspector. ## Overview [Safari Technology Preview](https://webkit.org/blog/6017/introducing-safari-technology-preview/) Release 212 is now [available for download](https://developer.apple.com/safari/resources/) for macOS Sequoia and macOS Sonoma. If you already have Safari Technology Preview installed, you can update it in System Settings under General → Software Update. This release includes WebKit changes between: [287863@main…288540@main](https://github.com/WebKit/WebKit/compare/71d72ae1c7cd3df4175dd1eeb890ecde16744d97...3e422be93723642dc34ce6855d0520403ea63469). ### Authentication #### New Features - Added support for setting a pin on a security key when a registration requires it. ([288259@main](https://commits.webkit.org/288259@main)) (122660610) ### Canvas #### Deprecations - Removed non-standard legacy alias of Canvas Compositing including `setAlpha` and `setCompositeOperation`. ([287871@main](https://commits.webkit.org/287871@main)) (141510218) ### CSS #### New Features - Added support for `view-transition-name: match-element`. ([288102@main](https://commits.webkit.org/288102@main)) (138932551) #### Resolved Issues - Fixed CSSPageRule to derive from CSSGroupingRule. ([288443@main](https://commits.webkit.org/288443@main)) (69847560) - Fixed `animation-name` set from the view transitions dynamic UA stylesheet having extra quotes. ([288417@main](https://commits.webkit.org/288417@main)) (142298840) - Fixed the serialization and parsing of `animation-name` strings. ([288404@main](https://commits.webkit.org/288404@main)) (142318879) #### Deprecations - Removed the non-standard `CSSUnknownRule` interface. ([288453@main](https://commits.webkit.org/288453@main)) (142380626) ### Forms #### Resolved Issues - Fixed the hover state getting lost when moving from a checkbox input to the parent label. ([288449@main](https://commits.webkit.org/288449@main)) (107220591) ### JavaScript #### New Features - Added support for an in-place interpreter for Wasm. ([288385@main](https://commits.webkit.org/288385@main)) (113768719) - Updated `JSON.parse` to provide the reviver function access to the input source text and extended `JSON.stringify` behavior to support object placeholders. ([288223@main](https://commits.webkit.org/288223@main)) (131579181) #### Resolved Issues - Fixed calendar canonicalization logic in `DateTimeFormat`. ([288143@main](https://commits.webkit.org/288143@main)) (141792829) - Fixed broken output for `Intl.DurationFormat` digital style when `hoursDisplay` is `"auto"`. ([288277@main](https://commits.webkit.org/288277@main)) (141969050) - Fixed `Intl.DurationFormat` to print a negative sign for minutes after hidden hours. ([288317@main](https://commits.webkit.org/288317@main)) (142119353) - Fixed `Array.prototype.toReversed` to fill holes with `undefined`. ([288339@main](https://commits.webkit.org/288339@main)) (142197604) ### Loading #### Resolved Issues - Fixed `javascript:` URL navigation to another browsing context created from `window.open` not checking the source’s Content Security Policy. (137941234) ### Networking #### New Features - Added support for cookies’ `Partitioned` attribute (opt-in partitioned cookies). ([288413@main](https://commits.webkit.org/288413@main)) (142317056) ### PDF #### Resolved Issues - Fixed main frame PDFs served with a CSP sandbox header not loading. ([288060@main](https://commits.webkit.org/288060@main)) (141166987) ### Rendering #### Resolved Issues - Fixed handling inline-box trailing content. ([288082@main](https://commits.webkit.org/288082@main)) (112409103) - Fixed grid layout animation performance by caching intrinsic logical heights during the first row sizing pass, improving efficiency and preventing invalidation issues with complex grid configurations. ([287890@main](https://commits.webkit.org/287890@main)) (135791322) - Fixed incorrect horizontal writing mode state when nested in a vertical block container. ([287877@main](https://commits.webkit.org/287877@main)) (141543326) - Fixed baseline calculation few cases for tables with empty rows. ([288314@main](https://commits.webkit.org/288314@main)) (142046863) - Fixed to refuse to break inside replaced content. ([288354@main](https://commits.webkit.org/288354@main)) (142224455) ### SVG #### New Features - Added support for the `lh` length type. ([288448@main](https://commits.webkit.org/288448@main)) (142068343) #### Resolved Issues - Fixed synthesizing a `viewBox` in `` only for the document element ``. ([288134@main](https://commits.webkit.org/288134@main)) (141733733) #### Deprecations - Removed SVGDocument alias to XMLDocument. ([288135@main](https://commits.webkit.org/288135@main)) (123121696) ### Text #### Resolved Issues - Fixed bold synthesis to be less aggressive. ([288130@main](https://commits.webkit.org/288130@main)) (138047199) ### Web API #### New Features - Added support for `element.focus({ focusVisible: true })`. ([287959@main](https://commits.webkit.org/287959@main)) (97021844) ### Web Inspector #### New Features - Exposed cookie Partition Key in Web Inspector. ([288103@main](https://commits.webkit.org/288103@main)) (136293236) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)