It also adds features such as Top Sites, Full History Search and Cover Flow, as well as support for modern web standards like HTML 5 and advanced CSS Effects.
"The successful beta release helped us fine tune Safari 4 into an even better, faster version that customers are going to love," said Philip Schiller, Apple's senior vice president of Worldwide Product Marketing, during his WWDC keynote. "Safari is enjoyed by 70 million users worldwide and with its blazing fast speed, innovative features and support for modern web standards, it's the best browser on any platform."
He added that Safari 4's Nitro JavaScript engine executes JavaScript nearly eight times faster than Internet Explorer 8 and more than four times faster than Firefox 3. Safari loads HTML web pages more than three times faster than IE 8 and three times faster than Firefox 3, Schiller said.
Starting with the development of the open source WebKit browser engine, Apple has been leading the industry in defining and implementing innovative web standards, he added. Safari 4 includes HTML 5 support for offline technologies and support for advanced CSS Effects, enabling an entirely new class of web applications that feature rich media, graphics and fonts. Safari 4 is the first browser to pass the Web Standards Project's Acid3 test, which examines how well a browser adheres to CSS, JavaScript, XML and SVG standards that are specifically designed for dynamic web applications.
Safari 4 includes Top Sites, for a visual preview of frequently visited and favorite pages; Full History Search, to search through titles, web addresses and the complete text of recently viewed pages; and Cover Flow, to flip through web history or bookmarks. Other features include Smart Address Fields for automatically completing web addresses from a list of suggestions; Search Fields, to fine tune searches with recommendations from Google Suggest or a list of recent searches; and Full Page Zoom, for a closer look at any web site without degrading the quality of the site's layout and text.
In Mac OS X Snow Leopard, available later this year, Safari runs as a 64-bit application, boosting the performance of the Nitro JavaScript engine by up to 50 percent., Schiller said. Snow Leopard makes Safari more resistant to crashes by running plug-ins in a separate process, so even if a plug-in crashes, Safari continues to run and the user simply has to reload the affected page.
Safari 4 is available for both Mac OS X and Windows as a free download. Safari 4 for Mac OS X requires Mac OS X Leopard 10.5.7 or Mac OS X Tigerv 10.4.11 and Security Update 2009-002, a minimum 256MB of memory and is designed to run on any Intel-based Mac or a Mac with a PowerPC G5, G4 or G3 processor and built-in FireWire. Safari 4 for Windows requires Windows XP SP2 or Windows Vista, a minimum 256MB of memory and a system with at least a 500 MHz Intel Pentium processor. Full system requirements and more information on Safari 4 can be found here.
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