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HTML <!DOCTYPE> tag

Syntax

<!DOCTYPE>

Definition and Usage

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.

HTML

HTML 4.01 specifies three document types: Strict, Transitional, and Frameset.

HTML Strict DTD

Use this when you want clean markup, free of presentational clutter. Use this together with Cascading Style Sheets (CSS):

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

HTML Transitional DTD

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):

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

Frameset DTD

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:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN" "http://www.w3.org/TR/html4/frameset.dtd">

XHTML

XHTML 1.0 specifies three XML document types: Strict, Transitional, and Frameset.

XHTML Strict DTD

Use this DTD when you want clean markup, free of presentational clutter. Use this together with Cascading Style Sheets (CSS):

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

XHTML Transitional DTD

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):

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

XHTML Frameset DTD

Use this DTD when you want to use frames!

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">

To check that you have written a valid XHTML document with a correct DTD,  you can link your XHTML page to an XHTML validator.

Attributes: NONE

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Top-Level Elements
<!--...-->
<!DOCTYPE> 
<html>
<head>
<body>
<frameset>
Head Elements
<base>
<isindex>
<link>
<meta>
<script>
<style>
<title>
Generic Block-level Elements
<address>
<blockquote>
<center>
<del>
<div>
<h1> to <h6>
<hr>
<ins>
<isindex>
<noscript>
<p>
<pre>
Lists
<dd>
<dir>
<dl>
<dt>
<li>
<menu>
<ol>
<ul>
Tables
<caption>
<col>
<colgroup>
<table>
<tbody>
<td>
<tfoot>
<th>
<thead>
<tr>
Forms
<button>
<fieldset>
<form>
<input>
<label>
<legend>
<option>
<optgroup>
<select>
<textarea>
Special Inline Elements
<a>
<applet>
<area>
<basefont>
<bdo>
<br>
<font>
<iframe>
<img>
<map>
<object>
<param>
<q>
<script>
<span>
<sub>
<sup>
Phrase Elements
<abbr>
<acronym>
<cite>
<code>
<del>
<dfn>
<em>
<ins>
<kbd>
<samp>
<strong>
<var>
Font Style Elements
<b>
<big>
<i>
<s>
<small>
<strike>
<tt>
<u>
Frames
<frame>
<frameset>
<noframes>

 

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