# Safari Technology Preview 198 Release Notes Learn about the latest web technology updates in Safari Technology Preview: CSS, Forms, JavaScript, Media, Rendering, Safari Extensions, SVG, Web API, Web Inspector, and WebRTC. ## Overview [Safari Technology Preview](https://webkit.org/blog/6017/introducing-safari-technology-preview/) Release 198 is now [available for download](https://developer.apple.com/safari/resources/) for macOS Sequoia beta 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: [279855@main…280286@main](https://github.com/WebKit/WebKit/compare/4d06a3cab666d588be8081b3a898a55cbd673540...8ca6c3acfc2b6998b79a46502908cbb1b95ac71f). ### CSS #### New Features - Added support for the `:active-view-transition` pseudo-class. ([280027@main](https://commits.webkit.org/280027@main)) (129851076) ### Forms #### Resolved Issues - Fixed input elements to use the `[value]` as the first fallback step base. ([280127@main](https://commits.webkit.org/280127@main)) (107721910) ### JavaScript #### Resolved Issues - Fixed V128 values to be throwable to match the specification. ([279989@main](https://commits.webkit.org/279989@main)) (106030051) ### Media #### Resolved Issues - Fixed missing picture-in-picture when leaving Safari with picture-in-picture enabled from video viewer. ([279877@main](https://commits.webkit.org/279877@main)) (124376686) - Fixed the context menu to show “Exit Viewer” when using video viewer. ([280128@main](https://commits.webkit.org/280128@main)) (126300924) ### Rendering #### Resolved Issues - Fixed scrolling in a flexbox container. ([279992@main](https://commits.webkit.org/279992@main)) (129343181) ### Safari Extensions #### Resolved Issues - Fixed throwing an exception when calling `browser.storage.set` with `undefined` as a map value. ([280265@main](https://commits.webkit.org/280265@main)) (130282050) ### SVG #### Deprecations - Removed non-standard `getTransformToElement` from SVGGraphicsElement ([280208@main](https://commits.webkit.org/280208@main)) (122435702) ### Web API #### Resolved Issues - Fixed an issue when inserting writing suggestions into an editable `display: grid` container. ([279986@main](https://commits.webkit.org/279986@main)) (129366300) ### Web Inspector #### Resolved Issues - Fixed disappearing objects and disclosure triangles when Web Inspector is at narrow widths. ([279894@main](https://commits.webkit.org/279894@main)) (121861970) - Fixed the list of breakpoints in the Sources tab disappearing when Web Inspector is reloaded. ([279884@main](https://commits.webkit.org/279884@main)) (123641994) ### WebRTC #### Resolved Issues - Fixed RTCEncodedVideoFrame and RTCEncodedAudioFrame to match the WebIDL specification. ([280198@main](https://commits.webkit.org/280198@main)) (118607685) --- 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)