Apple today released Safari Technology Preview 222 for macOS Tahoe and macOS Sequoia. This preview release allows developers and early adopters to use new features of Safari before they could be seen publicly available. Version 222 brings improvements in accessibility, CSS, media playback, page rendering, scrolling accuracy, and web API behavior.
Safari Technology Preview is available through System Settings under Software Update once the app is installed. No developer account is required to download it from Apple’s website. Users can run it alongside the regular Safari browser without conflict.
Accessibility Updates
In this release, Apple fixed several screen‑reader issues. Figcaption tags now only add to an image’s accessible name when no alt text or ARIA labels exist. Invalid aria‑setsize and aria‑posinset values now follow the latest ARIA rules. VoiceOver no longer reports pages as “Processing page infinity” when loading large documents.
CSS Enhancements
Safari Technology Preview 222 adds support for implicit anchor elements in pseudo‑elements that use anchor functions. Designers can now position generated content more precisely without extra markup. CSS filters also correctly create containing blocks as transforms do, and gradient interpolation for long‑hue gradients now matches expectations when an end color stop is omitted.
Media Playback Fixes
Video elements using WebM object URLs had been crashing with MediaError code 2. The new preview build resolves this issue, so WebM content plays without error.
Rendering and Scrolling Accuracy
Pages using CSS filters now render correctly with the proper containing block. Sticky elements now report exact decimal positions when using getBoundingClientRect, eliminating layout shifts on scroll.
Web API Corrections
Option elements in forms now preserve their full label text and handle empty labels correctly. This update ensures form controls work as developers expect.
Safari Technology Preview 222 contains the WebKit commits 295661-295967 on the trunk. It also requires either macOS Sequoia or the recently released macOS Tahoe. Apple takes the output of this preview channel to refine the features before these features are released in the mainstream Safari. To download the preview, developers and other interested users should visit the Safari Technology Preview page on Apple.