Apple today released an update to Safari Technology Preview 143 to test features that may be introduced into future versions of Safari. Safari Technology Preview version 143 includes bug fixes for Web Inspector, CSS Container Queries, CSS Cascade Layers, Subgrid, CSS, JavaScript, Rendering, Web Animations, SVG, Scrolling, WebAuthn, WebGL, HTML, Web API, Media, Accessibility and performance improvements, file system access and web extensions.
The current Safari Technology Preview version is built on the Safari 15.4 update, which includes the Safari 15 features introduced in macOS Monterey. Users can get “Safari Technology Preview” updates through the software update mechanism in System Preferences.
Apple launched the Safari Technology Preview to gather feedback from developers and users on its browser development process. Safari Technology Preview runs side-by-side with the existing Safari browser, and although it is designed for developers, it does not require a developer account to download.