Apple Releases Safari Technology Preview 174 – Brings Safari 17 Features, Bug Fixes and Performance Improvements

Apple has released Safari Technology Preview 174, 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 174 includes fixes and updates for CSS, CSS Container Queries, Layout, JavaScript, Media, Popover, Accessibility, SVG, and Web API.

Safari Technology Preview Release 174 is now available for download for macOS Monterey 12.3 or later and macOS Ventura. If you already have Safari Technology Preview installed, you can update it in the Software Update pane of System Preferences on macOS Monterey, or System Settings under General → Software Update on macOS Ventura.

Overview

Safari Technology Preview Release 174 is now available for download for macOS Sonoma beta 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: 265305@main…265693@main.

CSS

Added support for contain-intrinsic-size: auto none property syntax (265617@main)

Fixed text-overflow: ellipsis so it works with overflow: clip (265445@main)

Fixed cjk-earthly-branch and cjk-heavenly-stem counter styles to fallback to cjk-decimal (265474@main)

Fixed inline-flex and inline-grid boxes to stop propagating underlines to align with other browsers (265471@main)

Fixed CSS accelerated animation handling with multiple effects on the stack (265498@main)

Fixed cursor style to respect explicitly set cursor type over system default (265597@main)

CSS Container Queries

Fixed container units in a container query to evaluate against the ancestor container (265583@main)

Fixed container units to consider writing mode for unit resolution (265654@main)

Fixed how text decorations propagate into tables to align with other browsers (265488@main)

Layout

Fixed list alignment when a list item has a flex container (265464@main)

Fixed font size to allow use of fractional pixel values (265657@main)

Fixed bordercolor attribute on table elements to not create a visible border (265670@main)

JavaScript

Renamed .groupByToMap() on Array to .groupBy() on Object and Map in order to align with latest TC-39 proposal (265632@main)

Media

Added support for WebCodecs temporal scalabilityMode for software codecs, including parsing and error handling (265561@main)

Added support for WebM files with no track ID (265425@main)

Updated VTTCue to match latest W3C specification, including support for CSS updated default CSS properties, as well as support for vh, vw, cqh, and cqw units. (265596@main)

Popover

Fixed togglePopover() to always throw an exception if it’s disconnected or not a popover (265589@main)

Accessibility

Improved accessibility for tables and table components with display: flex, grid, block, inline-block, and contents (265486@main)

Prioritized HTML required attribute over aria-required when both are present (265552@main)

SVG

Fixed dominant-baseline CSS property to be inherited (265525@main)

Fixed references for SVG fragments in shadow DOM trees (265565@main)

Web API

Fixed constructing a SharedWorker in a detached document so it throws an exception (265483@main)

Removed artificial memory limit for canvas context, given it the same memory restrictions as other Web features (265628@main)

While the preview is intended for use by developers and advanced users, in order 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 macOS News Safari Technology Preview 174