Apple Releases Safari Technology Preview 190 – Brings Bug Fixes and Performance Improvements

Apple has released Safari Technology Preview 190, 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 190 brings fixes and updates for CSS, History, HTML, JavaScript, Media, Networking, SVG, URLs, Web API, and Web Inspector.

The current ‌Safari Technology Preview‌ release is compatible with machines running macOS Ventura and macOS Sonoma.

Overview

Safari Technology Preview Release 190 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: 274067@main…274941@main.

Authentication

New Features

• Added support for CTAP to set a pin. (274385@main) (113573055)

CSS

New Features

• Added support for the safe keyword in flexbox properties. (274304@main) (118000717)
• Added support for CSS style container queries. (274481@main) (122800215)

Resolved Issues

• Fixed getComputedStyle() to work with functional pseudo-elements like ::highlight(). (274846@main) (117864743)

History

Resolved Issues

• Fixed the properties of History to throw a SecurityError when not in a fully active Document. (274260@main) (118750576)

HTML

New Features

• Added support for the shadowrootclonable attribute and aligned with declarative shadow root standards changes. In particular, web developers will now have to set this attribute if they want their declarative shadow root to be clonable. (274727@main) (123006751)

JavaScript

Resolved Issues

• Fixed several issues:
  • direct eval() in a default value expression inside a rest parameter creates a variable in the environment of the function rather than the separate one of the parameters;
  • a ReferenceError is thrown when accessing a binding, which is defined inside rest parameter, in eval(), or a closure created in a default value expression of a preceding parameter, but only if there is a var binding by the same name;
  • a closure, created in the default value expression inside a rest parameter, is created in a different VariableEnvironment of the function than its counterparts in preceding parameters which causes the incorrect environment to be consulted when querying or modifying parameter names that are “shadowed” by var bindings. (274109@main) (121961421)

Media

Resolved Issues

• Fixed pseudo-element font size calculation to fix subtitle size in fullscreen mode. (274480@main) (122584350)

Deprecations

• Removed non-standard VTTRegion.track. (274936@main) (123172214)

Networking

Resolved Issues

• Fixed upgrading inactive or passive subresource requests and fetches in would-be mixed security contexts to match standards. (274409@main) (101678657)
• Fixed loading WebArchives with a non-persistent datastore. (274565@main) (122290562)

Rendering

Resolved Issues

• Fixed backdrop-filter to apply to the border area of an element with a border-radius. (274757@main) (122295068)

SVG

New Features

• Added support for the turn unit in <angle>. (274778@main) (120840743)

Resolved Issues

• Fixed the UA stylesheet for links in SVGs to apply cursor: pointer matching standards. (274422@main) (122715957)

URLs

Resolved Issues

• Fixed the URL parser to parse URLs that include authority and a backslash after the host. (274915@main) (119219832)

Web API

Resolved Issues

• Fixed changing HTMLCanvasElement width or height causing intermediate buffer allocations. (274135@main) (122309325)
• Fixed canvas captureStream stuttering with WebGL. (274454@main) (122471664)
• Fixed DOM Range to correctly account for CDATASection nodes. (274346@main) (122608224)

Web Inspector

Deprecations

• Disabled the network throttling experimental feature. (274112@main) (122327408)

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.