Expression Web SuperPreview speeds the essential task of debugging your web sites for cross-browser compatibility. With Expression Web SuperPreview, you don't need a web service to debug your pages on the same machine that you use for development. Expression Web SuperPreview is a standalone visual debugging tool for cross-browser testing. With Expression Web SuperPreview, you can ensure that your Web sites work correctly in today's popular web browsers.
Expression Web SuperPreview shows your web pages rendered in all versions of Internet Explorer. It also includes support for rendering in Firefox for Windows. Additional browser support is provided through the online service beta, which currently includes Chrome, Safari for Mac, Firefox, Internet Explorer 8, and Internet Explorer 9. You can view the pages side by side or as an onion-skin overlay and use rulers, guides and zoom/pan tools to precisely identify differences in layout. You can even compare your page comp to how the targeted browsers render the page.