Apple released Safari Technology Preview 243, the newest build of its experimental browser first shown in March 2016. The preview lets developers and power users trial features earmarked for future Safari releases, including new rendering paths and web standards. It can be downloaded from Apple’s site and installed via macOS’s Software Update pane, running alongside stable Safari.

Version 243 ships with a laundry list of fixes across Accessibility, CSS, JavaScript, WebGPU, WebRTC and dozens of other subsystems. Apple confirms compatibility with both macOS Sequoia and the freshly released macOS Tahoe, meaning anyone on the latest OS can run the preview alongside stable Safari without a developer account.

The update arrives through the same System Settings channel used for regular macOS patches, and full release notes are hosted on Apple’s developer site. By keeping the preview easy to install and side‑by‑side with production Safari, Apple continues to crowdsource real‑world performance data that can shape the next generation of its browser.

Apple uses the preview as a feedback conduit; crash reports and performance metrics flow back to its Safari engineering team. By exposing APIs like WebGPU early, the company nudges the broader web ecosystem toward adoption, while giving Mac users a glimpse of the browser’s direction without sacrificing their primary Safari experience.