XHTML in IE9

IE9 is the first version of Internet Explorer to natively support XHTML. For those not familiar, XHTML is the XML serialization of HTML. Among other benefits, XHTML can help maintain cleaner markup due to its fail-fast nature in the face of parsing errors. You can see IE9 running XHTML for yourself by visiting examples on the Internet Explorer Test Drive site like SVG Helicopter, IE Beatz, and