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As a developer, can I safely upgrade to IE8 and use its IE7 compatibility mode to test how sites look in IE7? For IE6, I have a virtual machine and it is quite inconvenient. I don’t want to upgrade to IE8 and then have another virtual machine now for IE7.
Or is IE7 compatibility mode really different and I can’t rely on that?
Compatibility mode in IE8 is not a 100% emulation of IE7. Security changes were not versioned, and some DOM operations were not versioned. Check out this blog post form Microsoft for a list of changes.
http://blogs.msdn.com/ie/archive/2009/03/12/site-compatibility-and-ie8.aspx