# Safari Technology Preview 197 Release Notes Learn about the latest web technology updates in Safari Technology Preview: Canvas, CSS, Forms, JavaScript, Rendering, Security, SVG, Web Inspector, WebDriver, and WebGL. ## Overview [Safari Technology Preview](https://webkit.org/blog/6017/introducing-safari-technology-preview/) Release 197 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: [279361@main…279854@main](https://github.com/WebKit/WebKit/compare/279f09128a7c6ecbb4812584d9946908eb0a8498...6311892c70d834b4aede4a04d4ce4ccc136063f4). ### Canvas #### Resolved Issues - Fixed a detached OffscreenCanvas to not transfer an ImageBuffer. ([279775@main](https://commits.webkit.org/279775@main)) (129270155) ### CSS #### Resolved Issues - Fixed custom counter styles `disclosure-open` and `disclosure-closed` to point to the correct direction in right-to-left. ([279404@main](https://commits.webkit.org/279404@main)) (109014745) ### Forms #### Resolved Issues - Fixed form controls drawing with an active appearance when the window is inactive. ([279458@main](https://commits.webkit.org/279458@main)) (127391198) ### JavaScript #### Resolved Issues - Fixed `fractionalDigits` of `Intl.DurationFormat` to be treated as at most 9 digits if it is omitted. ([279632@main](https://commits.webkit.org/279632@main)) (129145390) ### Media #### Resolved Issues - Fixed multiple cases of audio distortion occurring when using AudioWorklets. ([279409@main](https://commits.webkit.org/279409@main)) (128551401) ### Rendering #### Resolved Issues - Fixed `min-content` calculation for unstyled `only-child` inlines elements. ([273633@main](https://commits.webkit.org/273633@main)) (128348427) - Fixed ellipsis rendering multiple times when `position: relative` and `top` are used. ([279645@main](https://commits.webkit.org/279645@main)) (128394449) - Fixed a bug for inline elements inserted in reverse order after a block in a continuation. ([279422@main](https://commits.webkit.org/279422@main)) (128826228) - Fixed the flash of a page background-colored bar in the footer when the window is resized. ([279562@main](https://commits.webkit.org/279562@main)) (128940179) ### Security #### Resolved Issues - Fixed CORS bypass on private localhost domain using 0.0.0.0 host and mode “no-cors”. ([279835@main](https://commits.webkit.org/279835@main)) (125913679) ### SVG #### Resolved Issues - Fixed error handling for invalid filter primitive references. ([279421@main](https://commits.webkit.org/279421@main)) (104262208) - Fixed `SVGLength` to sync with the WebIDL specification. ([279659@main](https://commits.webkit.org/279659@main)) (129169603) ### Web Inspector #### Resolved Issues - Fixed Web Inspector to show nested workers. ([279793@main](https://commits.webkit.org/279793@main)) (108322385) - Fixed Accessibility inspector for switch controls to report “State: on/off” instead of “Checked: true/false”. ([279772@main](https://commits.webkit.org/279772@main)) (128952449) ### WebDriver #### Resolved Issues - Fixed retrieving titles containing multibyte characters. ([279767@main](https://commits.webkit.org/279767@main)) (123987149) ### WebGL #### Resolved Issues - Fixed `OffscreenCanvas.transferToImageBuffer()` to clear the WebGL drawing buffer. ([279434@main](https://commits.webkit.org/279434@main)) (126738038) --- 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)