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.
Safari 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 default
Receives regular updates through the Updates tab of the Mac App Store
Bug reports made on bugreport.apple.com should specify Safari Technology Preview
ECMAScript 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
Added the ability to use `document.execCommand('copy')` and `document.execCommand('cut')` in response to a user gesture to copy and cut text programmatically
The latest implementation of the Shadow DOM specification
Added support for Content Security Policy Level 2
Web Inspector Changes
Included many web compatibility fixes and bug fixes