# Safari Technology Preview 219 Release Notes Learn about the latest web technology updates in Safari Technology Preview: Canvas, CSS, JavaScript, Media, Rendering, Web API, Web Extensions, and WebRTC. ## Overview [Safari Technology Preview](https://webkit.org/blog/6017/introducing-safari-technology-preview/) Release 219 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: [293899@main…294487@main](https://github.com/WebKit/WebKit/compare/c82dcaa5c84f2b04b05756afbf2e3fa7b3356392...cbf24c0d5470db8030d01b052f7d963474fcfe59) ### Canvas #### Resolved Issues - Fixed re-drawing a canvas with relative width when the parent element is resized. ([294401@main](https://commits.webkit.org/294401@main)) (121996660) ### CSS #### New Features - Added support for the `margin-trim: block inline` syntax for trimming in both directions. ([294190@main](https://commits.webkit.org/294190@main)) (141784069) ### JavaScript #### Resolved Issues - Fixed `Array.prototype.pop` to throw an exception when the array is frozen. ([293907@main](https://commits.webkit.org/293907@main)) (141805240) - Fixed `f() = 1` behavior with other engines when not using strict mode. ([293996@main](https://commits.webkit.org/293996@main)) (149831750) ### Media #### Resolved Issues - Fixed SVG images with sub-resources to appear correctly when used in MediaSession. ([294334@main](https://commits.webkit.org/294334@main)) (148089535) ### Rendering #### Resolved Issues - Fixed an issue where `feMerge` incorrectly positioned HTML elements when merging the same `feMergeNode` multiple times. ([294088@main](https://commits.webkit.org/294088@main)) (149431216) - Fixed an issue in determining when a flex item should be used for percentage resolution during intrinsic width computation. ([293901@main](https://commits.webkit.org/293901@main)) (149615295) ### Web API #### Resolved Issues - Fixed an overly broad fullscreen exit trigger by restricting it to only text-entry elements gaining focus, preventing non-text input types from causing unexpected fullscreen exits. ([294284@main](https://commits.webkit.org/294284@main)) (136726993) ### Web Extensions #### Resolved Issues - Fixed `'allowAllRequests'` for `declarativeNetRequest`. ([294041@main](https://commits.webkit.org/294041@main)) (72203692) - Fixed a non-fatal `webRequest` error for non-persistent background content. ([294142@main](https://commits.webkit.org/294142@main)) (150051544) ### WebRTC #### New Features - Added support for RTCEncodedAudioFrame and RTCEncodedVideoFrame constructors. ([293951@main](https://commits.webkit.org/293951@main)) (149541424) --- 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)