HTML/XHTML Tag Quick Reference (HTML & XHTML: The Definitive Guide, 4th Edition)

In this appendix, we list in alphabetical order all the known and some undocumented HTML and XHTML tags and attributes currently supported by one or more of today's popular browsers.

B.1. Core Attributes

Prior to HTML 4.0, there were few attributes that could be used consistently for all the HTML tags. HTML 4.0 changed this, defining a set of sixteen core attributes that can be applied to almost all the elements in both HTML 4.01 and XHTML 1.0. For brevity, we list these core attributes in this section and spare you the redundancies in the table that follows:

`class=`name	Specify a style class controlling the appearance of the tag's contents
`dir=`dir	Specify the rendering direction for text, either left-to-right (`ltr`) or right-to-left (`rtl`)
`id=`name	Define a reference name for the tag that is unique in the document
`lang=`language	Specify the human language for the tag's contents with an ISO 639 standard two-character name and optional dialect subcode
`onclick=`applet	Specify an applet to be executed when the user clicks the mouse on the tag's contents display area
`ondblclick=`applet	Specify an applet to be executed when the user double-clicks the mouse button on the tag's contents display area
`onkeydown=`applet	Specify an applet to be executed when the user presses down on a key while the tag's contents have input focus
`onkeypress=`applet	Specify an applet to be executed when the user presses and releases a key while the tag's contents have focus
`onkeyup=`applet	Specify an applet to be executed when the user releases a pressed key while the tag's contents have focus
`onmousedown=`applet	Specify an applet to be executed when the user presses down on the mouse button when pointing to the tag's contents display area
`onmousemove=`applet	Specify an applet to be executed when the user moves the mouse in the tag's contents display area
`onmouseout=`applet	Specify an applet to be executed when the user moves the mouse off the tag's contents display area
`onmouseover=`applet	Specify an applet to be executed when the user moves the mouse into the tag's contents display area
`onmouseup=`applet	Specify an applet to be executed when the user releases the mouse button when in the tag's contents display area
`style=`style	Specify an inline style for the tag
`title=`string	Specify a title for the tag

Only a small handful of tags accept none or only some, but not all, of these attributes. They are:

<applet>
<base>
<basefont>
<bdo>
<br>
<comment>
<embed>
<font>
<frame>
<frameset>
<head>
<hr>
<html>
<iframe>
<ilayer>
<isindex>
<keygen>
<layer>
<marquee>
<meta>
<multicol>
<nobr>
<noembed>
<param>
<script>
<server>
<spacer>
<style>
<title>
<wbr>

For convenience, we've marked each of these tags with an asterisk (*) in the following table, and list all of the attributes supported by these special tags, including the common ones. For all other tags (those without an asterisk), assume the common attributes listed above apply. Do note, however, that the popular browsers do not support all the HTML standard 4.0 attributes, common or not. Please refer to the main text for details.

Appendix B. HTML/XHTML Tag Quick Reference

Contents:

B.1. Core Attributes