Release Notes for Safari Technology Preview 191

Mar 28, 2024

by Jon Davis

Safari Technology Preview Release 191 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: 274942@main…276246@main.

Accessibility

New Features

  • Added support for ariaBrailleLabel and ariaBrailleRoleDescription element reflection properties. (275591@main) (123926949)

Resolved Issues

  • Fixed a bug preventing VoiceOver word echoing in some text fields. (275694@main) (122451549) (FB13592798)
  • Fixed time input accessibility by adding labels to subfields. (275301@main) (122590568)
  • Fixed datetime values being exposed to assistive technologies in the wrong timezone. (275265@main) (123522296)
  • Fixed time control accessibility by adding a label to the meridiem component. (276195@main) (123781149)
  • Fixed wrong datetime value being exposed to assistive technologies for datetime-local inputs. (275548@main) (123803281)
  • Fixed the computed role for these elements: dd, details, dt, em, hgroup, option, s, and strong. (276240@main) (124641956)

Authentication

Resolved Issues

  • Fixed excludeCredentials property being ignored during a passkey registration request. (276006@main) (124405037)

CSS

Resolved Issues

  • Fixed getComputedStyle() to work with functional pseudo-elements like ::highlight(). (274846@main) (117864743)
  • Fixed changing color scheme to update gradients with system colors or light-dark(). (275645@main) (121285450)
  • Fixed :empty selector to work with animations. (275832@main) (122838142)
  • Fixed starting style to inherit from its parent’s after-change style. (275061@main) (123302667)
  • Fixed CSS container style queries to allow !important. (275104@main) (123374708)
  • Fixed preserving whitespace when serializing custom properties. (275236@main) (123491915)
  • Fixed updating style correctly for non-inherited custom property mutations. (275445@main) (123645196)
  • Fixed element removed by parent to end up losing the last remembered size. (275606@main) (123975513)
  • Fixed resolving container units in style queries. (275689@main) (124058441)

Forms

Resolved Issues

  • Fixed native text fields becoming invisible in dark mode. (275363@main) (123658326)
  • Fixed <select multiple> scrollbars to match the used color scheme. (275505@main) (123807167)
  • Fixed fallback native <select> rendering in dark mode. (275532@main) (123845293)

JavaScript

Resolved Issues

  • Fixed String.prototype.replace to not take the fast path if the pattern is RegExp Object and the lastIndex is not numeric. (275255@main) (101122567)
  • Fixed Symbol.species getters to not share a single JS Function. (275064@main) (120416817)
  • Fixed try/catch to not intercept errors originated in [[Construct]] of derived class. (275353@main) (121959506)
  • Fixed TypedArray sorting methods to have a special-case for camparator returning false. (276130@main) (122093956)
  • Fixed emitReturn() to load this value from arrow function lexical environment prior to the TDZ check. (275425@main) (122430056)
  • Fixed NFKC normalization to work with Latin-1 characters. (275062@main) (123328161)
  • Fixed parsing of private names with Unicode start characters. (275152@main) (123425805)
  • Fixed instanceof to not get RHS prototype when LHS is primitive. (275318@main) (123629166)
  • Fixed bracket update expression to resolve property key at most once. (275531@main) (123872374)
  • Fixed bracket compound assignement to resolve the property key at most once. (276014@main) (124420301)

Lockdown Mode

Resolved Issues

  • Fixed: Updated the trusted list of fonts to address missing glyphs on some sites. (275705@main) (123658932)

Media

New Features

  • Added support for WebCodecs AV1 when an AV1 hardware decoder is available. (275174@main) (123433815)

Resolved Issues

  • Fixed audio distortion over internal speakers when streaming content in web browsers. (275262@main) (122590884)
  • Fixed playback for MSE videos on some sites. (275443@main) (123528095)
  • Fixed firing loadeddata events for <audio> and <video> on page load. (275997@main) (124079735) (FB13675360)

SVG

Resolved Issues

  • Fixed returning the initial value for the SVG gradient stop-color if it is not rendered in the page. (274997@main) (123262508)
  • Fixed the SVG marker segment calculations if the marker path consists of sub-paths. (275167@main) (123434203)

Web API

Resolved Issues

  • Fixed cssTextsetter to change the style attribute when the serialization differs. (276176@main) (29861252) (FB5535475)
  • Fixed mousemove events in an iframe when the mouse is clicked from outside the iframe and then moves into it while the button is held down. (275157@main) (120540148) (FB13517196)
  • Fixed getGamepads() to no longer trigger an insecure contexts warning. (274962@main) (123039555)

Deprecations

  • Removed HashChangeEvent‘s non-standard initHashChangeEvent() method. (276232@main) (124736521)

Web Inspector

Resolved Issues

  • Fixed expanded sections of Storage to not collapse. (275783@main) (107687975)
  • Fixed CSS font property values marked !important not getting overridden when using the interactive editing controls. (275389@main) (112080113)
  • Fixed runtimes to be aligned in the Audit tab. (275298@main) (121810292)
  • Fixed info and debug buttons not appearing in the Console Tab until new console messages are displayed. (275914@main) (122923625)
  • Fixed remembering the message type selection in the Console tab. (275143@main) (122924275)
  • Fixed autocomplete for the text-indent property suggesting prefixed properties instead of each-line or hanging. (274979@main) (123240715)
  • Fixed background autocompletion suggestion to include repeating-conic-gradient. (275160@main) (123428709)

WebRTC

Resolved Issues