Apple talking :
" Safari 4 features the Nitro engine which runs JavaScript up to 4.5 times faster than Safari 3. Safari 4 makes browsing more intuitive and enjoyable with innovative features, such as Top Sites, Full History Search and Cover Flow, and support for modern web standards like HTML 5 and advanced CSS Effects.
Safari is designed to emphasize the browsing, not the browser. The browser frame is a single pixel wide. You see a scroll bar only when needed. By default, there’s no status bar. Instead, a progress gear turns as your page loads. And if you so choose, you can hide almost the entire interface, removing virtually every distraction from the browser window. A great browser should get out of your way and let you simply enjoy the web. Safari does just that. And it does it regardless of platform."
Read more and download Safari 4 browser
