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Section B.1. Core Attributes

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  



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