Safari Technology Preview for Mac Get a sneak peek at upcoming web technologies in OS X and iOS.
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Safari Technology Preview for Mac Description

Get a sneak peek at upcoming web technologies in OS X and iOS and experiment with these technologies in your websites and extensions. This release of Safari Technology Preview contains the most recent additions and improvements to WebKit and the latest advances in Safari web technologies. Browser DifferencesSafari Technology Preview can be run side-by-side with Safari and set as the default browser Separate local data stores are used for history, bookmarks, cookies, and cache Browsing history and bookmarks are synced over iCloud when iCloud sync is enabled The Develop menu is enabled by defaultReceives regular updates through the Updates tab of the Mac App Store Bug reports made on bugreport.apple.com should specify Safari Technology Preview JavaScript ImprovementsECMAScript 6 support including lexical scoping, iterators, generators, arrow functions, default parameter values and many new built-in APIs Better standards compliant IndexedDB support with more stability Included the B3 JavaScript JIT compiler with low-latency, high-throughput that boosts performance Added the ability to use `document.execCommand('copy')` and `document.execCommand('cut')` in response to a user gesture to copy and cut text programmatically HTML EnhancementsThe latest implementation of the Shadow DOM specification Added support for Content Security Policy Level 2 Web Inspector ChangesAdded memory summary and JavaScript allocations timelines Added a fast JavaScript sampling profiler Improved JavaScript profiling timeline view Behavior ChangesIncluded many web compatibility fixes and bug fixes

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