---
title: Safari Technology Preview 212 Release Notes
framework: safari-technology-preview-release-notes
role: article
role_heading: Article
path: safari-technology-preview-release-notes/stp-release-212
---
# 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
Overview Safari Technology Preview Release 212 is now available for download 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. Authentication New Features Added support for setting a pin on a security key when a registration requires it. (288259@main) (122660610) Canvas Deprecations Removed non-standard legacy alias of Canvas Compositing including setAlpha and setCompositeOperation. (287871@main) (141510218) CSS New Features Added support for view-transition-name: match-element. (288102@main) (138932551) Resolved Issues Fixed CSSPageRule to derive from CSSGroupingRule. (288443@main) (69847560) Fixed animation-name set from the view transitions dynamic UA stylesheet having extra quotes. (288417@main) (142298840) Fixed the serialization and parsing of animation-name strings. (288404@main) (142318879) Deprecations Removed the non-standard CSSUnknownRule interface. (288453@main) (142380626) Forms Resolved Issues Fixed the hover state getting lost when moving from a checkbox input to the parent label. (288449@main) (107220591) JavaScript New Features Added support for an in-place interpreter for Wasm. (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) (131579181) Resolved Issues Fixed calendar canonicalization logic in DateTimeFormat. (288143@main) (141792829) Fixed broken output for Intl.DurationFormat digital style when hoursDisplay is "auto". (288277@main) (141969050) Fixed Intl.DurationFormat to print a negative sign for minutes after hidden hours. (288317@main) (142119353) Fixed Array.prototype.toReversed to fill holes with undefined. (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) (142317056) PDF Resolved Issues Fixed main frame PDFs served with a CSP sandbox header not loading. (288060@main) (141166987) Rendering Resolved Issues Fixed handling inline-box trailing content. (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) (135791322) Fixed incorrect horizontal writing mode state when nested in a vertical block container. (287877@main) (141543326) Fixed baseline calculation few cases for tables with empty rows. (288314@main) (142046863) Fixed to refuse to break inside replaced content. (288354@main) (142224455) SVG New Features Added support for the lh length type. (288448@main) (142068343) Resolved Issues Fixed synthesizing a viewBox in only for the document element