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Safari 4 is a high performance, modern Internet web browser for Mac OS X and Microsoft Windows.  It supports HTML 5 and CSS 3, and includes the Nitro Javascript Engine. Safari 4 includes features to help maximize your online experience. It is designed to use tabbed browsing to reduce browser window clutter; see your favorite web sites at a glance in Top Sites; perform full history searches to find a website you visited in the past, and use Cover Flow for history and bookmarked sites.  Safari 4 is also designed to block pop-up windows, and use powerful built-in development tools. This guide will help you familiarize yourself with the look and feel of Safari 4, as well as a few customizations that help you personalize your browsing experience