[danheberden]

For the most part the compatibility modes work, but there are inconsistencies - such as bugs that appear in IE7, but not in IE8 in compatibility mode. Its a headache, and one that's somewhat remedied by just using the actual browsers.

[saurik]

Does Microsoft Expression Web SuperPreview (Microsoft's official tool for this purpose, which comes with the various rendering engines plugged into a meta-browser) have these same deficiencies?

[robflynn]

Thanks for the info. That's what I was hoping to find out by having these. They now live happily within my suite of various development/testing tools.