Apple Releases Safari Technology Preview 181 – Brings Bug Fixes and Performance Improvements

Apple has released Safari Technology Preview 181, 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 181 includes fixes and updates for CSS, HTML, JavaScript, Media, Rendering, and SVG.

Overview

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…268366@main.

CSS

New Featuresin

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

Resolved Issues

• Fixed <position> to never serialize to a single value. (268291@main) (111750372)
• Fixed <family-name> to forbid generic families. (268203@main) (113746537)
• 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)

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

Resolved Issues

• 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)

Media

New Features

• Added MediaStream support for whiteBalanceMode. (268102@main) (115552800)

Rendering

Resolved Issues

• Fixed resizing behavior with writing-mode: vertical-rl or direction: rtl. (268157@main) (102620110)
• Fixed handling iframes with display: none. (268148@main) (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 Issuesin page link

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

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.