Safari version 11 released at September 19, 2017, use this tag in addition of safari tag when you want to ask specific question related with this version.
Safari version 11 released at September 19, 2017.
Safari 11 includes several new features such a Intelligent Tracking Prevention feature which prevents websites from cross-site tracking:
prevents audio from auto-playing on "most" websites, according to Apple. Users can also configure things like auto-play, content blockers, and Reader on a per-site basis, or make settings universal.
The browser also includes performance boosts, new controls for HTML audio and video, and better AutoFill accuracy when pulling data from Contacts.
Wiki: https://en.wikipedia.org/wiki/Safari_(web_browser)#Safari_11
Update announcement: http://appleinsider.com/articles/17/09/19/apple-issues-safari-11-update-for-macos-sierra-os-x-el-capitan