# Safari Technology Preview 239 Release Notes Learn about the latest web technology updates in Safari Technology Preview: Accessibility, CSS, Editing, Forms, MathML, Media, PDF, Rendering, Scrolling, Web API, Web Inspector, WebAssembly, and WebRTC. ## Overview [Safari Technology Preview](https://webkit.org/blog/6017/introducing-safari-technology-preview/) Release 239 is now [available for download](https://developer.apple.com/safari/resources/) for macOS Tahoe and macOS Sequoia. 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: [307619@main…308417@main](https://github.com/WebKit/WebKit/compare/43f381aada9d3b9b13985746b74a0d6a362d3cd2...1c537b0aea640597681150878d85e1bc0bc9ab09). ### Accessibility #### Resolved Issues - Fixed an issue where SVG `` elements referencing `` elements inside an `` were incorrectly included as unnamed images in VoiceOver’s Images web rotor. ([308126@main](https://commits.webkit.org/308126@main)) (98999595) - Fixed an issue where VoiceOver was unable to access `aria-owned` rows and their cells in grids and tables. ([308087@main](https://commits.webkit.org/308087@main)) (168770938) - Fixed an issue where VoiceOver could not find focusable splitter elements when navigating to the next or previous form control. ([308089@main](https://commits.webkit.org/308089@main)) (170187464) - Fixed an issue where controls with `aria-labelledby` did not use the native label’s geometry when both the control and its ARIA label had no visible bounding box. ([307727@main](https://commits.webkit.org/307727@main)) (170518900) ### CSS #### New Features - Added support for the `:open` pseudo-class for `` elements. ([308148@main](https://commits.webkit.org/308148@main)) (170804152) #### Resolved Issues - Fixed an issue where tables with collapsed borders incorrectly calculated the first row width, causing excess border width to spill into the table’s margin area. ([308311@main](https://commits.webkit.org/308311@main)) (149675907) - Fixed an issue where `inset` `box-shadow` was incorrectly positioned on table cells with collapsed borders. ([307661@main](https://commits.webkit.org/307661@main)) (169254286) - Fixed an issue where `display: grid` subgrids inside `grid-lanes` containers incorrectly contributed their item intrinsic sizes to the parent’s track sizing algorithm. ([308253@main](https://commits.webkit.org/308253@main)) (170168798) - Fixed the baseline calculation for `inline-block` elements so that when `overflow` is not `visible`, the baseline is correctly set to the bottom margin edge. ([307718@main](https://commits.webkit.org/307718@main)) (170575015) - Fixed an issue where replaced elements did not correctly apply `min-height` and `min-width` constraints in certain configurations. ([308212@main](https://commits.webkit.org/308212@main)) (170765025) - Fixed an issue where children with percentage heights inside absolutely positioned elements using intrinsic height values (`fit-content`, `min-content`, `max-content`) incorrectly resolved against the containing block’s height instead of being treated as `auto`. ([308226@main](https://commits.webkit.org/308226@main)) (171179193) ### Editing #### Resolved Issues - Fixed an issue where `execCommand('FormatBlock')` did not preserve inline styles of replaced block elements, causing text formatting to be lost when pasting content. ([308365@main](https://commits.webkit.org/308365@main)) (157657531) - Fixed an issue where `text-indent` flickered or was ignored on `contenteditable` elements while typing. ([307646@main](https://commits.webkit.org/307646@main)) (170280101) ### Forms #### Resolved Issues - Fixed an issue where a `readonly` date `` could still be edited via keyboard using the date picker. ([307934@main](https://commits.webkit.org/307934@main)) (169488939) ### MathML #### Resolved Issues - Fixed an issue where dynamic changes to `` element attributes did not trigger a relayout. ([308014@main](https://commits.webkit.org/308014@main)) (170907029) - Fixed positioning of the `` element within `` layout. ([308013@main](https://commits.webkit.org/308013@main)) (170909975) - Fixed an issue where the MathML fraction bar was not painted when its thickness was equal to its width. ([308025@main](https://commits.webkit.org/308025@main)) (170934351) - Fixed an issue where `` and `` elements were not laid out as `` elements in MathML. ([308050@main](https://commits.webkit.org/308050@main)) (170940035) ### Media #### Resolved Issues - Fixed an issue where the `VideoFrame` constructor did not handle the video color range correctly for NV12 (I420 BT601) video frames. ([307649@main](https://commits.webkit.org/307649@main)) (170299037) ### PDF #### Resolved Issues - Fixed a regression where form fields in PDF documents were not readable when editing in dark mode. ([308330@main](https://commits.webkit.org/308330@main)) (171198060) ### Rendering #### Resolved Issues - Fixed an issue where images were incorrectly stretched in certain page layouts. ([307751@main](https://commits.webkit.org/307751@main)) (170270187) ### Scrolling #### Resolved Issues - Fixed an issue where interrupting scroll momentum caused the scrolling container to stop rendering and hit-testing to be misplaced. ([308215@main](https://commits.webkit.org/308215@main)) (116205365) - Fixed an issue where pages could become blank and jump to the top after dynamically loading new content when scroll anchoring was enabled. ([308352@main](https://commits.webkit.org/308352@main)) (170889205) - Fixed an issue where scroll anchoring could cause pages to scroll to negative offsets. ([308320@main](https://commits.webkit.org/308320@main)) (171221075) ### Web API #### Resolved Issues - Fixed an issue where the `change` event was not fired on `` and `