Apple has released Safari Technology Preview 230, 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 231 includes fixes and updates for CSS, JavaScript, Media, Rendering, Web API, Web Inspector, and WebDriver.

The current ‌Safari Technology Preview‌ release is compatible with machines running macOS Sequoia and macOS Tahoe, the newest version of macOS that launched earlier this year.

Overview

Safari Technology Preview Release 231 is now available for download for macOS Tahoe and macOS Sequoia. 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: 300987@main…301765@main.

CSS

New Features

Added support for the safe keyword with anchor-center in CSS Anchor Positioning. (301301@main) (155767796)

Added support for flip-x and flip-y options in position-try-fallback for CSS Anchor Positioning. (302057@main) (163282036)

Resolved Issues

Fixed handling of padding and margins for flex and grid layouts across all writing modes. (301814@main) (71046552)

Fixed position-visibility: no-overflow to respond correctly to scrolling. (301211@main) (162173481)

Fixed: Renamed position-area keywords from x-self-start, x-self-end, y-self-start, and y-self-end to self-x-start, self-x-end, self-y-start, and self-y-end respectively to align with updated CSSWG specifications.(301226@main) (162214793)

Fixed <iframe> elements so their content correctly respects the page’s usedZoom(). (302097@main) (162314059)

Fixed auto margins by converting them to zero when position-area or anchor-center is applied in CSS Anchor Positioning. (301662@main) (162809291)

JavaScript

Resolved Issues

Fixed TypeError messages when calling class or function constructors without new to include the constructor name. (301023@main) (161152354)

Media

Resolved Issues

Fixed an issue where custom WebVTT caption text size settings did not propagate to cue child elements by moving the font-size definition into the cue’s shared <style> block. (301681@main) (162547969)

Rendering

New Features

Added support for text shaping across inline boxes. (301354@main) (162430932)

Resolved Issues

Fixed an issue where selecting table cells could cause overlapping selections in flex and grid layouts. (294464@main) (160805174)

Fixed a performance issue on layouts with long pre blocks and word-break: break-all by including whitespace in overflow width calculations. (301657@main) (162695099)

Fixed Largest Contentful Paint to optimize text paints by performing an early area comparison when an element has only one text box. (301895@main) (163067611)

Fixed Largest Contentful Paint to skip tracking loadTime for data URI images. (301988@main) (163213487)

Fixed how Largest Contentful Paint performs area checks for text nodes, optimizing calculations when all rects are collected and ancestor transforms are absent. (302072@main) (163285757)

Web API

Resolved Issues

Fixed Navigation API WPT tests failing due to a WebDriver error. (161199777)

Fixed PerformanceEventTiming so that keydown and pointerdown entries no longer wait for their corresponding keyup or pointerup events before assigning a duration, preventing durations from appearing too long. (302107@main) (161911473)

Fixed attachShadow() to use the global custom element registry by default when customElementRegistry is null, aligning with the WHATWG DOM specification (300996@main). (161949493)

Fixed navigate() with { history: "replace" } to correctly update the current History item instead of adding a new one during same-document navigations. (302130@main) (163323288)

Web Inspector

Resolved Issues

Fixed an issue where the Sources tab won’t show contents of a script that contains a for statement with optional chaining in the test condition. (301197@main) (160617913)

WebDriver

Resolved Issues

Fixed an issue where element references nested inside Array or Object arguments were not properly extracted when executing scripts. (301445@main) (162571946)

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 macOS News Safari Technology Preview