# Safari Technology Preview 190 Release Notes Learn about the latest web technology updates in Safari Technology Preview: Authentication, CSS, History, HTML, JavaScript, Media, Networking, Rendering, SVG, URLs, Web API, Web Inspector, and WebGPU. ## Overview [Safari Technology Preview](https://webkit.org/blog/6017/introducing-safari-technology-preview/) Release 190 is now [available for download](https://developer.apple.com/safari/resources/) 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](https://github.com/WebKit/WebKit/compare/d6d2602cfff3fe9880f243845a21f868166cef0b...37058f49d69567fee5bf978118d9b1fdc3e31f1b). ### Authentication #### New Features - Added support for CTAP to set a pin. ([274385@main](https://commits.webkit.org/274385@main)) (113573055) ### CSS #### New Features - Added support for the `safe` keyword in flexbox properties. ([274304@main](https://commits.webkit.org/274304@main)) (118000717) - Added support for CSS style container queries. ([274481@main](https://commits.webkit.org/274481@main)) (122800215) #### Resolved Issues - Fixed `getComputedStyle()` to work with functional pseudo-elements like `::highlight()`. ([274846@main](https://commits.webkit.org/274846@main)) (117864743) ### History #### Resolved Issues - Fixed the properties of `History` to throw a SecurityError when not in a fully active Document. ([274260@main](https://commits.webkit.org/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](https://commits.webkit.org/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](https://commits.webkit.org/274109@main)) (121961421) ### Media #### Resolved Issues - Fixed pseudo-element font size calculation to fix subtitle size in fullscreen mode. ([274480@main](https://commits.webkit.org/274480@main)) (122584350) #### Deprecations - Removed non-standard `VTTRegion.track`. ([274936@main](https://commits.webkit.org/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](https://commits.webkit.org/274409@main)) (101678657) - Fixed loading WebArchives with a non-persistent datastore. ([274565@main](https://commits.webkit.org/274565@main)) (122290562) ### Rendering #### Resolved Issues - Fixed `backdrop-filter` to apply to the border area of an element with a `border-radius`. ([274757@main](https://commits.webkit.org/274757@main)) (122295068) ### SVG #### New Features - Added support for the `turn` unit in ``. ([274778@main](https://commits.webkit.org/274778@main)) (120840743) #### Resolved Issues - Fixed the UA stylesheet for links in SVGs to apply `cursor: pointer` matching standards. ([274422@main](https://commits.webkit.org/274422@main)) (122715957) ### URLs #### Resolved Issues - Fixed the URL parser to parse URLs that include authority and a backslash after the host. ([274915@main](https://commits.webkit.org/274915@main)) (119219832) ### Web API #### Resolved Issues - Fixed changing HTMLCanvasElement width or height causing intermediate buffer allocations. ([274135@main](https://commits.webkit.org/274135@main)) (122309325) - Fixed canvas `captureStream` stuttering with WebGL. ([274454@main](https://commits.webkit.org/274454@main)) (122471664) - Fixed DOM Range to correctly account for CDATASection nodes. ([274346@main](https://commits.webkit.org/274346@main)) (122608224) ### Web Inspector #### Deprecations - Disabled the network throttling experimental feature. ([274112@main](https://commits.webkit.org/274112@main)) (122327408) ### WebGPU #### New Features - Enabled preview support for WebGPU. ([274784@main](https://commits.webkit.org/274784@main)) (122988764) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)