Release Notes for Safari Technology Preview 208

Nov 21, 2024

by Jon Davis

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)