Designers and developers want their Web applications to render as intended in various browsers. You can now code your markup, and compare to Firefox, Safari, IE6, Internet Explorer 8 and even to your PhotoShop comps to make sure that your design is pixel-perfect.
Expression Web SuperPreview simplifies testing and debugging layout issues across different web browsers and platforms. You can view your pages in multiple browsers simultaneously or view how a page renders in a browser and compare it to a comp or mock-up image of a page. You can even do overlays to see exactly where mismatches may occur. To help you quickly figure out where the problem is, DOM highlighting shows absolute positions of the rendered elements and HTML elements display CSS properties.
Here is an in-depth interview and demo from VisitMix.You can get it from Microsoft Expression Web SuperPreview for Windows Internet Explorer.For more information, see Expression Web SuperPreview.