Apple has released Safari Technology Preview 208, the latest version of their developer preview web browser. The preview version of Apple’s popular browser offers developers and other interested users the ability to try out features that may or may not, debut in future public release versions of Safari.

‌Safari Technology Preview‌ 208 includes fixes and updates for CSS, JavaScript, Rendering, Scrolling, Web API, Web Authentication, Web Extensions, Web Inspector, and WebRTC.

The current ‌Safari Technology Preview‌ release is compatible with machines macOS Sonoma and macOS Sequoia, the newest version of macOS.

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 <img> 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 <img> 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)

While the preview is intended for use by developers and advanced users, to provide Apple with feedback on the development of the Safari browser, it can be run side-by-side with the release version of Safari. The app doesn’t require a developer account to download and install. For more information, visit the Safari Technology Preview website.

Topics Apps macOS News Safari Technology Preview 208