The <html> section
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
<head>
<title>Title of the document</title>
</head>
<body>
Contents of the document
</body>
</html>
Both, the
<head>
and the
<body>
sections must be nested inside the
<html>
section.
The
<html>
opening tag must include the mandatory
xmlns attribute with the
http://www.w3.org/1999/xhtml value (again, refering to the XHML standard).
The
<html>
opening tag can also include the optional
lang attribute to define the language you will use for the contents of your web page. The language value must be a two-letter code.
eg.
en = English
fr = French
es = Spanish
For the complete list of language codes, please refer to
http://xml.coverpages.org/iso639a.html.
Remember, although the lang attribute is optional, its proper use will greatly help search engines to index your site correctly.
