# Safari Technology Preview 240 Release Notes Learn about the latest web technology updates in Safari Technology Preview: CSS, Editing, Forms, HTML, Media, PDF, Rendering, SVG, Scrolling, Web API, Web Extensions, Web Inspector, and WebAssembly. ## Overview [Safari Technology Preview](https://webkit.org/blog/6017/introducing-safari-technology-preview/) Release 240 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: [308418@main…309286@main](https://github.com/WebKit/WebKit/compare/92d46f7506c61bfcdb73d36c2f5dffc87844eeea...4d96716c8dc8eb15bea579d6097eba53ec4d3ed4). ### CSS #### New Features - Added support for the `revert-rule` CSS keyword, which rolls back the cascade to behave as if the current style rule had not been present. ([308733@main](https://commits.webkit.org/308733@main)) (171132753) #### Resolved Issues - Fixed an issue on macOS where custom CSS scrollbars could be cut off and the scrollbar corner rect was sized incorrectly. ([309119@main](https://commits.webkit.org/309119@main)) (168566468) - Fixed `hanging-punctuation` to support U+0027 (apostrophe) and U+0022 (quotation mark) as hangable quotes. ([308597@main](https://commits.webkit.org/308597@main)) (171672576) - Fixed `hanging-punctuation` to allow ideographic space (U+3000) to hang when used with the `first` value. ([308605@main](https://commits.webkit.org/308605@main)) (171679311) ### Editing #### Resolved Issues - Fixed an issue where the Font Picker style selection became unusable after changing fonts when editing multiple lines of text. ([308562@main](https://commits.webkit.org/308562@main)) (110651645) - Fixed an issue where emoji images were not preserved correctly when copying and pasting content across different websites. ([309176@main](https://commits.webkit.org/309176@main)) (162708499) - Fixed an issue where text selection would jump unexpectedly when selecting absolutely-positioned content inside an element with `user-select: none`. ([308451@main](https://commits.webkit.org/308451@main)) (170475401) ### Forms #### Resolved Issues - Fixed an issue where keyboard tabbing position was lost when a focused button became disabled, causing focus to jump to the beginning of the page. ([308991@main](https://commits.webkit.org/308991@main)) (120676409) ### HTML #### Resolved Issues - Fixed viewport `` parsing to correctly treat form feed as ASCII whitespace per the HTML specification. ([309044@main](https://commits.webkit.org/309044@main)) (108440799) - Fixed incorrect parsing of pixel-length margin attributes on ``, `