HTML & XHTML: The Definitive Guide, 5th Edition

Appendix B. HTML/XHTML Tag Quick Reference

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.

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 16 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 content display area
ondblclick= applet	Specify an applet to be executed when the user double-clicks the mouse button on the tag’s content 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 ...