Expression Studio 3 has a great new feature that was announced and demonstrated back at the Mix 09 conference called SuperPreview. It allows you to compare how a page looks across multiple browsers including IE6, IE7, IE8 and FireFox (with more
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Read the complete post at http://weblogs.asp.net/dwahlin/archive/2009/07/24/previewing-websites-in-multiple-browsers-with-expression-web-3-s-superpreview.aspx