Apple announced the immediate availability of Safari 4 for Mac OS X and Windows on Monday during its World Wide Developer Conference keynote presentation. Versions are available for Mac OS X 10.4 and 10.5 as well as Windows XP and Vista.
According to Apple's Bertrand Serlet, Safari 4 scores 100% on the Acid3 standards test, where Microsoft's Internet Explorer Web browser scores only 21 percent. He added that when Safari 4 is running on a Mac with Snow Leopard, or Mac OS X 10.6, plug-ins that crash won't cause the browser to crash, too.
Safari 4 is also 50 percent faster at running 64-bit Java.
Safari 4 is free and will be available for download some time today at the Apple Web site.