Since there is no update for Yahoo`s YUI Graded Browser Support in Q2 I`ve made my own list:

A-graded:

• Firefox 4
• Firefox 5
• Safari 5
• Safari for iOS 4
• Internet Explorer 9
• Internet Explorer 8
• Google Chrome 11
• Google Chrome 12
• WebKit for Android OS 2.2
• WebKit for Android OS 3.0