Apple today released a new update for Safari Technology Preview, the experimental browser Apple first introduced four years ago in March 2016. Apple designed the Safari Technology Preview to test features that may be introduced into future release versions of Safari.
Safari Technology Preview release 104 includes extensive bug fixes and performance improvements for Web Inspector, Web API, CSS, Web Animations, Intersection Observer, Media, WebRTC, WebAuthn, and Safari Extensions.
The new Safari Technology Preview update is available for both macOS Mojave and macOS Catalina, the newest version of the Mac operating system that was released in October 2019.
The Safari Technology Preview update is available through the Software Update mechanism in the Mac App Store to anyone who has downloaded the browser. Full release notes for the update are available on the Safari Technology Preview website.
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 designed for developers, it does not require a developer account to download.