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Mandatory XHTML Elements
All XHTML documents must have a DOCTYPE declaration. The html, head, title, and body elements must be present.
This is an XHTML document with a minimum of required tags:
<!DOCTYPE Doctype goes here>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Title goes here</title>
</head>
<body>
</body>
</html>
Note: The DOCTYPE declaration is not a part of the XHTML document itself. It is not an XHTML element. You will learn more about the XHTML DOCTYPE in the next chapter.
Note: The xmlns attribute in <html>, specifies the xml namespace for a document, and is required in XHTML documents. However, the HTML validator at w3.org does not complain when the xmlns attribute is missing. This is because the namespace "xmlns=http://www.w3.org/1999/xhtml" is default, and will be added to the <html> tag even if you do not include it.
