Appendix 2: Tools for Debugging Web Applications and Add-ons
Windows XP Mode
You can use Windows XP Mode in Windows® 7 to run Internet Explorer® 6, Internet Explorer 7, or Internet Explorer 8 side-by-side with Windows Internet Explorer 9. For more information, download Windows XP Mode with Virtual PC.
Microsoft Expression Web SuperPreview
You can use Microsoft Expression Web SuperPreview to see rendering differences between different versions of Internet Explorer. Internet Explorer 9 is included in the new SuperPreview Online Service. For more information about Microsoft Expression Web SuperPreview, see SuperPreview online service.
For more information, see the blog Microsoft Expression Web SuperPreview.
Internet Explorer Compatibility Test Tool (IECTT)
The Internet Explorer Compatibility Test Tool (IECTT) – a component of the Microsoft Application Compatibility Toolkit – can help you diagnose issues in your web applications by logging compatibility events. The tool displays issues in real time, and optionally uploads results to an Application Compatibility Toolkit (ACT) database. The results include details about potential compatibility issues, and links for more information about each compatibility issue.
For more information about this issue and others related to Developers tools, see What is the Internet Explorer Compatibility Test Tool?.
For a list of events logged by IECTT, see Internet Explorer Application Compatibility.