Non so più cosa fare
Non riesco a convalidare il documento iniziando dal doctype, disperato allora sono andato nel sito ed ho copiato il template messo a disposizione:
codice:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

<head>
	<title>An XHTML 1.0 Strict standard template</title>
	<meta http-equiv="content-type" 
		content="text/html;charset=utf-8" />
	<meta http-equiv="Content-Style-Type" content="text/css" />
</head>
Ma alla convalida mi dice:

Contradictory Parse Modes Detected! The MIME Media Type () indicated parse mode should be SGML, but the DOCTYPE Declaration indicates XML mode. Using SGML mode based on the Content-Type header.

Namespace Found in non-XML Document Namespace "" found, but document type is not XML!

This page is not Valid XHTML 1.0 Strict!
Below are the results of attempting to parse this document with an SGML parser.

Error Line 9 column 68: character data is not allowed here.
...content-type" content="text/html;charset=utf-8" />
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

aragraph</p>) or forgetting to quote an attribute value (where characters such as "%" and "/" are common, but cannot appear without surrounding quotes).
Datemi un mano perfavore