If you're using XHTML 1.1 correctly then it shouldn't even be working in IE The XHTML 1.0 specification makes it clear that "application/xhtml+xml" is the only truly correct content type for XHTML, but it also allows websites to send the document as "text/html" as long as certain compatibility guidelines are followed. This provision only applies to XHTML 1.0. According to the specification, XHTML 1.1 must be sent as "application/xhtml+xml" or one of the other XML content types, not "text/html". Any website sending a document labeled XHTML 1.1 as "text/html" is in violation of the specification.Internet Explorer only works correctly when sending as text/html. :)Btw, as an example, try viewing this page in various browsers, it won't work in IEhttp://clifford.excelitehost.com/xhtml11test.php