Apple Releases Safari Technology Preview 219 Brings Bug Fixes and Performance Improvements

Apple has released Safari Technology Preview 219, 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 219 includes fixes and updates for Canvas, CSS, JavaScript, Media, Rendering, Web API, Web Extensions, and WebRTC.

The current ‌Safari Technology Preview‌ release is compatible with machines macOS Sonoma and macOS Sequoia, the newest version of macOS.

Overview

Safari Technology Preview Release 219 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: 293899@main…294487@main

Canvas

Resolved Issues

• Fixed re-drawing a canvas with relative width when the parent element is resized. (294401@main) (121996660)

CSS

New Features

• Added support for the margin-trim: block inline syntax for trimming in both directions. (294190@main) (141784069)

JavaScript

Resolved Issues

• Fixed Array.prototype.pop to throw an exception when the array is frozen. (293907@main) (141805240)
• Fixed f() = 1 behavior with other engines when not using strict mode. (293996@main) (149831750)

Media

Resolved Issues

• Fixed ensuring SVG images have the correct pixels when used in MediaSession. (294334@main) (148089535)

Rendering

Resolved Issues

• Fixed an issue where feMerge incorrectly positioned HTML elements when merging the same feMergeNode multiple times. (294088@main) (149431216)
• Fixed an issue in determining when a flex item should be used for percentage resolution during intrinsic width computation. (293901@main) (149615295)

Web API

Resolved Issues

• Fixed an overly broad fullscreen exit trigger by restricting it to only text-entry elements gaining focus, preventing non-text input types from causing unexpected fullscreen exits. (294284@main) (136726993)

Web Extensions

Resolved Issues

• Fixed 'allowAllRequests' for declarativeNetRequest. (294041@main) (72203692)
• Fixed a non-fatal webRequest error for non-persistent background content. (294142@main) (150051544)

WebRTC

New Features

• Added support for RTCEncodedAudioFrame and RTCEncodedVideoFrame constructors. (293951@main) (149541424)

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.