Release Notes for Safari Technology Preview 24

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Feb 22, 2017by Jon DavisSafari Technology Preview Release 24 is now available for download for macOS Sierra. If you already have Safari Technology Preview installed, you can update from the Mac App Store’s Updates tab. This release covers WebKit revisions 211256-212356.User TimingAdded User Timing as an experimental feature (r211332)Implemented PerformanceObserver for User Timing (r211406)Added support for Performance API (performance.now(), UserTiming) in Workers (r211594)Link PreloadAdded <link preload> as an experimental feature (r211341)Added support for speculative resource loading (r211480)Prevented preloaded resources from being cleared after parsing is done (r211649)Addressed memory issues related to clearing preloaded resources (r211673)Web APIChanged Location object to throw a TypeError for Object.preventExtensions() (r211778)Changed Pointer Lock to require keyboard focus (r211652)Changed Pointer Lock events to be delivered directly to the target element (r211650)Changed th…