--- title: Safari Technology Preview 208 Release Notes framework: safari-technology-preview-release-notes role: article role_heading: Article path: safari-technology-preview-release-notes/stp-release-208 --- # Safari Technology Preview 208 Release Notes Learn about the latest web technology updates in Safari Technology Preview: CSS, JavaScript, Rendering, Scrolling, Web API, Web Authentication, Web Extensions, Web Inspector, and WebRTC. ## Overview Overview Safari Technology Preview Release 208 is now available for download 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: 285487@main…286403@main. CSS New Features Added attr() fallback support. (285849@main) (136763160) Resolved Issues Fixed combining CSS clip-path with any property that creates a new stacking context makes element disappear. (286172@main) (86091397) Fixed resize to not be applied to generated content. (285644@main) (121348638) Fixed :not(:has(...)) invalidation. (285987@main) (122689282) Fixed @scope start and end to be a forgiving selector list. (286393@main) (139471866) JavaScript New Features Added support for Iterator.concat. (285587@main) (138013723) Implemented relaxed laneselect SIMD instructions. (286162@main) (138484223) Enabled support for Iterator Helpers. (285734@main) (138520150) Added support for Map.prototype.getOrInsert and WeakMap..prototype.getOrInsert. (286377@main) (138955824) Rendering Resolved Issues Fixed element with height: min-content getting streteched vertically. (286284@main) (137063317) Fixed support for CSS width and height properties on MathML elements. (285892@main) (138174295) Fixed Inline content incorrectly positioning around right-to-left and/or vertical shape-outside floats. (286007@main) (139076129) Fixed incorrectly overlapping when a float has shape-outside: inset. (286054@main) (139133291) Fixed right-to-left content failing with a shape-outside float. (286079@main) (139198865) Fixed incorrectly overlapping a float that has shape-outside: ellipse in vertical mode. (286088@main) (139208636) Fixed incorrectly overlapping a float that has shape-outside: polygon in right-to-left. (286099@main) (139215719) Scrolling Resolved Issues Fixed scrollbar appearance when the used color scheme changes. (286229@main) (138108344) Web API Resolved Issues Fixed Gamepad rumble issue where sending two sequential playEffect() requests prevents reset() from working as expected. (286286@main) (126589062) (FB13733668) Web Authentication Resolved Issues Fixed .catch() for conditional mediation not getting passed the abort reason that was thrown. (286208@main) (112178073) Web Extensions New Features Added declarativeNetRequest support for initiatorDomains and excludedInitiatorDomains. (286340@main) (97014647) (FB10684115) Added support for unless-frame-url to content blockers. (286310@main) (139456686) Resolved Issues Fixed an issue causing content blockers to not hide content in “about:blank” frames. (286221@main) (134273470) Fixed storage.onChanged returning undefined as the areaName. (285510@main) (138086765) Fixed es-419 support in Web Extensions. (285875@main) (138857112) Web Inspector Resolved Issues Fixed the Elements tab DOM tree view reducing deeply-nested nodes to one character wide. (286163@main) (86833831) Fixed error cases to match new source map specification. (285541@main) (137934436) WebRTC Resolved Issues Fixed voice search to not re-prompt for camera or microphone permission after a page-initiated same origin navigation.(285950@main) (138122655) ## See Also ### 2024 - [Safari Technology Preview 210 Release Notes](safari-technology-preview-release-notes/stp-release-210.md) - [Safari Technology Preview 209 Release Notes](safari-technology-preview-release-notes/stp-release-209.md) - [Safari Technology Preview 207 Release Notes](safari-technology-preview-release-notes/stp-release-207.md) - [Safari Technology Preview 206 Release Notes](safari-technology-preview-release-notes/stp-release-206.md) - [Safari Technology Preview 205 Release Notes](safari-technology-preview-release-notes/stp-release-205.md) - [Safari Technology Preview 204 Release Notes](safari-technology-preview-release-notes/stp-release-204.md) - [Safari Technology Preview 203 Release Notes](safari-technology-preview-release-notes/stp-release-203.md) - [Safari Technology Preview 202 Release Notes](safari-technology-preview-release-notes/stp-release-202.md) - [Safari Technology Preview 201 Release Notes](safari-technology-preview-release-notes/stp-release-201.md) - [Safari Technology Preview 200 Release Notes](safari-technology-preview-release-notes/stp-release-200.md) - [Safari Technology Preview 199 Release Notes](safari-technology-preview-release-notes/stp-release-199.md) - [Safari Technology Preview 198 Release Notes](safari-technology-preview-release-notes/stp-release-198.md) - [Safari Technology Preview 197 Release Notes](safari-technology-preview-release-notes/stp-release-197.md) - [Safari Technology Preview 196 Release Notes](safari-technology-preview-release-notes/stp-release-196.md) - [Safari Technology Preview 195 Release Notes](safari-technology-preview-release-notes/stp-release-195.md)