hola, solo que esto no es reconocido:
<![if !IE]>
<![endif]>
pero aqui te va el detalle:
Cita:
Validation Output: 5 Errors
1. Error Line 8, Column 3: "if" is not a reserved name.
<![if !IE]>
Line 8, Column 6: character data is not allowed here.
<![if !IE]>
✉
You have used character data somewhere it is not permitted to appear. Mistakes that can cause this error include:
* putting text directly in the body of the document without wrapping it in a container element (such as a <p>aragraph</p>), or
* forgetting to quote an attribute value (where characters such as "%" and "/" are common, but cannot appear without surrounding quotes), or
* using XHTML-style self-closing tags (such as <meta ... />) in HTML 4.01 or earlier. To fix, remove the extra slash ('/') character. For more information about the reasons for this, see Empty elements in SGML, HTML, XML, and XHTML.
Line 10, Column 3: "endif" is not a reserved name.
<![endif]>
Line 8, Column 1: XML Parsing Error: StartTag: invalid element name.
<![if !IE]>
Line 1