The content attribute specifies the mode for the page; to mimic the behavior of Internet Explorer 7, specify IE=EmulateIE7. Specify IE=5, IE=7, or IE=8 to select one of those compatibility modes. You can also specify IE=edge to tell Internet Explorer 8 to use the highest mode available.
If your site does not display correctly in Internet Explorer 8, you can update the site to support the latest Web standards (preferred) or you can add a meta element to your pages that tell Internet Explorer 8 to render your site as if it were being viewed in an older version of the browser.
In conjunction with the Beta 2 release of Internet Explorer 8, we are posting the set of tests we are using to validate our interpretation and implementation of the CSS 2.1 specification
Untrusted (Process can only write to low integrity locations, such
as the Temporary Internet Files\Low folder or the
HKEY_CURRENT_USER\Software\LowRegistry key)