Release Notes for Safari Technology Preview 181

Oct 18, 2023

by Jon Davis

Safari Technology Preview Release 181 is now available for download for macOS Sonoma and macOS Ventura. 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: 268060@main…269057@main.

Accessibility

Resolved Issues

  • Fixed non-group and non-tree-item children of role="treeitem" elements becoming stale after dynamic changes. (268385@main) (115936550)

CSS

New Features

  • Added support for content-visibility. (268313@main) (114734606)

Resolved Issues

  • Fixed <position> to never serialize to a single value. (268291@main) (111750372)
  • Fixed computation of the from-font value for font-size-adjust. (269041@main) (113328110)
  • Fixed <family-name> to forbid generic families. (268203@main) (113746537)
  • Fixed nested subgrids from contributing to the calculation of the enclosing track size. (268947@main) (114271839)
  • Fixed offset path inset shapes with a border-radius. (268192@main) (115316728)
  • Fixed blend modes with Interoperability improvements. (268173@main) (115688282)
  • Fixed not serializing at <position> in circle() or ellipse() if unspecified. (268344@main) (115866108)
  • Fixed serialization of shape-outside. (268365@main) (115938310)
  • Fixed serialization issues with clip-path and offset-path. (268379@main) (115953688)
  • Fixed circle() and ellipse() to use non-offset starting position for CSS Motion Path. (268400@main) (115962433)
  • Fixed non-orthogonal subgrid margin, border, and padding to be considered for self-align baseline items in the same alignment context. (268804@main) (116206243)

DOM

Resolved Issues

  • Fixed handling tasks scheduled for web pages in the back-forward cache. (268782@main) (116349535)

Forms

Resolved Issues

  • Fixed serialization of autocomplete with a webauthn token. (268520@main) (116107937)

HTML

New Features

  • Added support for one-time-code as an allowed autocomplete field name. (268097@main) (115684196)

Resolved Issues

  • Fixed respecting the first parseable <meta name="color-scheme"> value. (268064@main) (64705222)
  • Fixed [dir=auto] invalidation with password fields. (268322@main) (115887776)

JavaScript

New Features

  • Implemented Annex B block-level function hoisting for global scope. (268553@main) (53234438)
  • Added support for Promise.withResolvers. (268892@main) (116473362)

Resolved Issues

  • Fixed stringification algorithm of the Function constructor to match specifications. (268633@main) (102065151)
  • Fixed generator functions to not be Annex B hoisting candidates. (268352@main) (114213642)
  • Fixed the algorithm determining Annex B hoisted functions to perform lexical scope chain walk. (268302@main) (115504046)
  • Fixed block-level function declarations to not allow shadow var bindings. (268634@main) (116202546)
  • Fixed duplicate lexical bindings to only be allowed for function declarations. (268671@main) (116252189)

Loading

Resolved Issues

  • Fixed Link-stylesheet elements to not fire load events for non-text/css and non-2XX responses. (268535@main) (116112223)
  • Fixed link-stylesheet elements to not fire load events for non-2XX responses such as 3XX responses that do not redirect. (268779@main) (116331826)

Media

New Features

  • Added support for variable packet durations in Vorbis streams. (268625@main) (99712672)
  • Added MediaStream support for whiteBalanceMode. (268102@main) (115552800)

Rendering

Resolved Issues

  • Fixed uses of backdrop-filter: blur() with mix-blend-mode to render properly. (268426@main) (34470317)
  • Fixed resizing behavior with writing-mode: vertical-rl or direction: rtl. (268157@main) (102620110)
  • Fixed handling iframes with display: none. (112494003)
  • Fixed opacity and rendering the root element background image. (268156@main) (115396444)
  • Fixed the color of the drop shadow to preserve its alpha channel. (268233@main) (115812347)
  • Fixed filters with outsets to repaint the entire filterRegion if GraphicsStyles are used. (268282@main) (115817290)
  • Fixed compositing the filter style transparency layers to not clip the destination context. (268341@main) (115901634)

Deprecations

  • Removed margin-trim behavior for floats to match specification changes. (268227@main) (115794102)

SVG

Resolved Issues

  • Fixed the SVG mask to work as a mask-resource for the CSS mask-image. (268272@main) (114465545)

Web API

New Features

  • Added support for CSS Custom Highlights API. (268673@main) (116255516)

Resolved Issues

  • Fixed formAssociated=true causing a custom element to become focusable. (268756@main) (115909679)
  • Fixed TextTrackCue constructor to match updated specifications. (268644@main) (116002871)

Web Inspector

Resolved Issues

  • Fixed resource sorting in the Sources tab to consider the filename and extensions separately. (268557@main) (72905353)

WebDriver

Resolved Issues

  • Fixed dispatched mouse events always having buttons property set to zero. (268529@main) (116049187)

WebGL

Resolved Issues

  • Fixed a bug where multi-level textures would lose levels in WebGL. (268819@main) (116362216)

WebRTC

Resolved Issues

  • Fixed media tracks obtained with {"width":1920,"height":1080,"frameRate":24}. (268386@main) (61747755)
  • Fixed video quality when using TransformStream with Simulcast. (268912@main) (110395571)