

Alongside yesterday's high-profile developer seeds of OS X Lion Developer Preview 4, the first iOS 5 beta, and several iCloud-related betas including iTunes 10.5 and iPhoto 9.2, Apple also provided developers with a developer preview version of Safari 5.1 for both Mac and Windows. According to an announcement on Apple's developer portal, Safari 5.1 brings a number of enhancements to the company's flagship browser and will be available to the public sometime this summer.
A number of new APIs supporting Safari Extensions are also included in the update, which will presumably be made available to the public alongside the release of OS X Lion.Safari and Mac Developer Program members can download Safari 5.1 Developer Preview and take advantage of new technologies, including support for full-screen webpages, media caching with the HTML5 application cache, and better graphics acceleration on Windows.
A separate Safari 5.0.6 release is available for developers to test on Mac OS X Leopard systems.
Article Link: Apple Seeds Safari 5.1 Developer Preview for Mac and Windows to Developers