Following is a list of some of the standard features and functions of SharePoint 2010 that you should check against your visual design build. All of these components have their own unique CSS and styles. Testing these features and functions helps you find and change any out-of-the-box styles.
The Ribbon can be a complex element to test against. At minimum you will want to make sure the Ribbon does not display any unnecessary extra space above and below it. Figure 7-10 shows the default look and feel of the Ribbon.