Release Notes for Safari Technology Preview 52

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Mar 21, 2018by Jon DavisSafari Technology Preview Release 52 is now available for download for macOS Sierra and macOS High 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 228856-229535.Legacy NPAPI Plug-insRemoved support for running legacy NPAPI plug-ins other than Adobe FlashService WorkerChanged Fetch event release assert to take into account the fetch mode (r228930)Changed to not use a Service Worker in the case of document redirection if it will be already served by AppCache (r229086)Fix loads for a Document controlled by a Service Worker to not use AppCache (r229181)Updated Service Worker to respect IndexedDB and DOM cache partitioning (r229483)LoadingAdded support for preconnect link headers (r229308)Fixed converting a load to a download to work with async policy delegates (r229177)Prevented DNS prefetching from being re-enabled (r229061)JavaScriptFixed handling undefined…