Apple has released Safari Technology Preview 233, 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 233 includes fixes and updates for Animations, HTML, MathML, Rendering, Web API, and Web Inspector.

The current ‌Safari Technology Preview‌ release is compatible with machines running macOS Sequoia and macOS Tahoe, the newest version of macOS that launched earlier this year. The ‌update is available through the Software Update mechanism in System Preferences or System Settings to anyone who has downloaded the browser from Apple’s website.

Overview

Safari Technology Preview Release 233 is now available for download for macOS Tahoe and macOS Sequoia. 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: 302450@main…303091@main.

Animations

Resolved Issues

Fixed incorrect overlap calculations for transform animations including translate, scale, and rotate properties. (303045@main) (88383253)

HTML

New Features

Added support for enhanced HTML select parsing to allow <select> elements to include <optgroup>, <option>, and <hr> at deeper nesting levels. (302480@main) (163927485)

MathML

New Features

Added support for the MathML scriptlevel attribute, mapping it to CSS math-depth as a presentational hint. (302841@main) (164469677)

Resolved Issues

Fixed mpadded elements in RTL (dir="rtl") to respect lspace. (303070@main) (164740784)

Rendering

Resolved Issues

Fixed an issue where fixed positioned elements were not rendered correctly in right-to-left pages using the vertical-rl writing mode. (302542@main) (161712734)

Web API

New Features

Added support for reading Blob.stream() with a BYOB (getReader({mode:'byob'})) reader. ( 302787@main ) (164307723)

Resolved Issues

Fixed Trusted Types to correctly send CSP violation reports when a default policy returns an invalid javascript: URL or throws an exception. (302543@main) (160960418)

Fixed NavigateEvent to correctly fire an AbortSignal when a navigation is aborted. (302591@main) (163957784)

Fixed NavigateEvent.sourceElement to correctly reference elements from different browsing contexts. (302504@main) (163962362)

Web Inspector

New Features

Added support for capturing console.screenshot images within a Worker, including handling of ImageData, ImageBitmap, OffscreenCanvas, various CanvasRenderingContext types, and valid base64 data: URLs. (302778@main) (98223234)

Apple’s aim with ‌Safari Technology Preview‌ is to gather feedback from developers and users on its browser development process. ‌Safari Technology Preview‌ can run side-by-side with the existing Safari browser and while it is designed for developers, it does not require a developer account to download and use.

Topics Apps macOS News Safari Technology Preview