Apple Releases Safari Technology Preview 176 – Brings Bug Fixes and Performance Improvements

Apple has released Safari Technology Preview 176, 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 176 brings fixes and updates for CSS, Rendering, Accessibility, Media, and Web API.

Overview

Safari Technology Preview Release 176 is now available for download for macOS Sonoma beta 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: 266088@main…266418@main.

CSS

• Added support for contain-intrinsic-size: inherit (266100@main)
• Implemented linear(...) timing function for CSS animations & transitions (266195@main)
• Corrected auto none support for contain-intrinsic-size (266136@main)
• Made <hr> width attribute set to 0 or 0px compute to 1px (266418@main)

Rendering

• Fixed out-of-flow boxes not showing (266366@main)
• Fixed canvas not showing the results of CanvasRenderingContext2D.putImageData until a forced re-render (266397@main)
• Fixed scrollbar not updating on CSS color-scheme change (266176@main)
• Prevented invalidating columns when the entire table is being destroyed (266344@main)

Accessibility

• Fixed display: contents elements sometimes missing their children (266407@main)
• Fixed incorrect accessible name from multiple <label> elements (266151@main)
• Fixed unexpected speech synthesis behavior for unordered lists (266383@main)

Media

• Implemented automatic text track selection for 'metadata' tracks (266380@main)
• Fixed RTCRtpSender maxFramerate encoding parameter having no effect (266128@main)
• Fixed updating time stamps on media controls to update while scrubbing the timeline (266339@main)

Web API

• Added support for the title attribute for pattern validation errors (266311@main)
• Aligned naturalWidth and naturalHeight with spec, changing from int to unsigned (266302@main)
• Changed to return opaque origin for blob: URL containing inner non-http(s): URL (266247@main)
• Converted embed hidden into a proper boolean attribute (266399@main)
• Fixed ElementInternals.setFormValue(<nullish value>) to clear the submission value (266126@main)
• Fixed custom highlight logic for checking author and set text color (266117@main)
• Fixed custom highlight text decoration to respect priority (266184@main)
• Fixed emoji characters sometimes getting incorrectly drawn in text style (266089@main)
• Fixed URL pathname and search setter incorrectly stripping trailing spaces (266252@main)
• Handled focusability for plugin elements which have browsing context (266286@main)
• Throttled mousemove events to one per rendering update (266341@main)

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.