Balise meta et erreur W3C

bonjours,

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<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
			<link rel="stylesheet" type="text/css" href="../../design/Basic/style.css" />
 
<title>Document sans nom</title>
</head>
 
<body>
															   <?php
 
                                                                                                                           include "includes/menu_haut.php";
                                                                                                                           ?>
 
 
<section>
    <h6>slideshow</h6>
<article> <h6>slideshow</h6></article>
 
 
 
 
</section>
 
 
 
															   <?php
 
                                                                                                                           include "includes/menu_bas.php";
                                                                                                                           ?>
 
 
 
 
 
 
 
 
</body>
</html>

il me dit

Citation:

alidation Output: 1 Error

Warning Line 3, Column 74: Using windows-1252 instead of the declared encoding iso-8859-1.
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
✉
Warning Legacy encoding windows-1252 used. Documents should use UTF-8. ✉
Error Line 3, Column 74: Bad value text/html; charset=iso-8859-1 for attribute content on element meta: iso-8859-1 is not a preferred encoding name. The preferred label for this encoding is windows-1252.
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
Syntax of legacy character encoding declaration:
The string text/html;, optionally followed by whitespace, followed by charset=, followed by a preferred encoding name according to the Encoding Standard. Example: text/html; charset=utf-8

merci