Apple today released a new update for Safari Technology Preview, the experimental browser Apple first introduced over two years ago in March of 2016. Apple designed the Safari Technology Preview to test features that may be introduced into future release versions of Safari.
Safari Technology Preview release 55 includes bug fixes and feature improvements for CSS, Web API, Rendering, Accessibility, JavaScript, Web Driver, Web Inspector, Media, WebRTC, and Security.
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.
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[doublepost=1525298585][/doublepost] The cost is for attending the weeklong conference with Apple's engineers to learn about the upcoming Apple platform major releases as well as attending the highly-useful engineering labs.
If you're referring to keynote, that's free to the whole world to watch as a live-stream.
As Apple is doing annual releases, major new features often get delegated to major releases rather than minor OS releases.
Dark mode may require system-wide changes that STP can't do because the rumors are that Safari would check for the macOS's system pref to detect if dark mode is on. In other words, Dark mode requires the upcoming macOS release before STP/Safari can use it.