The <!DOCTYPE> tag indicates to the Web server what type
of document it's parsing. The <!DOCTYPE> tag below supports
both HTML and XHTML. It should be placed at the top of all of
your documents.
It is interesting to note that the <!DOCTYPE> tag, which is
the first tag at the top of an XHTML document, is defined as
uppercase "DOCTYPE", yet the rules of XHTML state that all tags
and attributes should be lowercase. There is no good explanation
for this deviation from the standard.
NOTE: This tag is required for an XHTML document to validate.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>Welcome to HTML</title>
</head>
<body>
Welcome to the world of HTML!
</body>
</html>
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