📄 tag_doctype.asp@output=print
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html lang="en-US" xml:lang="en-US" xmlns="http://www.w3.org/1999/xhtml">
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<title>HTML DOCTYPE TAG</title>
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<p>From <b>http://www.w3schools.com</b> (Copyright Refsnes Data)</p>
<h1>HTML <!DOCTYPE> tag</h1>
<hr />
<h2>Definition and Usage</h2>
<p>The <!DOCTYPE> declaration is the very first thing in your
document, before the <html> tag. This tag tells the browser which HTML
or XHTML specification the document uses.</p>
<hr />
<h2>Tips and Notes</h2>
<p><b>Note: </b>The <!DOCTYPE> tag does not have an end tag! </p>
<hr />
<h2>HTML</h2>
<p>HTML 4.01 specifies three document types: Strict, Transitional, and Frameset.</p>
<h3>HTML Strict DTD</h3>
<p>Use this when you want clean markup, free of presentational clutter. Use this
together with Cascading Style Sheets (CSS):</p>
<table class="ex" cellspacing="0" border="1" width="100%">
<tr>
<td><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"></td>
</tr>
</table>
<h3>HTML Transitional DTD</h3>
<p>
The Transitional DTD includes presentation attributes and elements that
W3C expects to move to a style sheet. Use this when you need to use HTML's
presentational features because your readers don't have browsers that support
Cascading Style Sheets (CSS):</p>
<table class="ex" cellspacing="0" border="1" width="100%">
<tr>
<td><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"></td>
</tr>
</table>
<h3>Frameset DTD</h3>
<p>
The Frameset DTD should be used for documents with frames. The Frameset DTD is
equal to the Transitional DTD except for the frameset element replaces the body
element:
</p>
<table class="ex" cellspacing="0" border="1" width="100%">
<tr>
<td><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN" "http://www.w3.org/TR/html4/frameset.dtd"></td>
</tr>
</table>
<br />
<hr />
<h2>XHTML</h2>
<p>XHTML 1.0 specifies three XML document types: Strict, Transitional, and Frameset.</p>
<h3>XHTML Strict DTD</h3>
<p>Use this DTD when you want clean markup, free of presentational clutter. Use
this together with Cascading Style Sheets (CSS):</p>
<table width="100%" border="1" class="ex" cellspacing="0"><tr><td valign="top">
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
</td></tr></table>
<h3>XHTML Transitional DTD</h3>
<p>Use this DTD when you need to use XHTML's presentational features because
your readers don't have browsers that support Cascading Style Sheets (CSS):</p>
<table width="100%" border="1" class="ex" cellspacing="0"><tr><td valign="top">
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
</td></tr></table>
<h3>XHTML Frameset DTD</h3>
<p>Use this DTD when you want to use frames!</p>
<table width="100%" border="1" class="ex" cellspacing="0"><tr><td valign="top">
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">
</td></tr></table>
<p>To check that you have written a valid XHTML document with a correct DTD,
you can link your XHTML page to an XHTML validator.</p>
<hr />
<p>Attributes: NONE</p>
<hr />
<p>From <b>http://www.w3schools.com</b> (Copyright Refsnes Data)</p>
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