Purpose

primary heading

Description

This element encloses text which is a heading of the highest importance.

Start tag

Required <H1>

Attributes

Name	Type	Default	Comment
class	CDATA	#IMPLIED	space-separated list of classes
dir	( ltr \| rtl )	#IMPLIED	direction for weak/neutral text
id	ID	#IMPLIED	document-wide unique id
lang	NAME	#IMPLIED	language code as RFC1766; language code
onclick	CDATA	#IMPLIED	script expression; a pointer button was clicked
ondblclick	CDATA	#IMPLIED	script expression; a pointer button was double clicked
onkeydown	CDATA	#IMPLIED	script expression; a key was pressed down
onkeypress	CDATA	#IMPLIED	script expression; a key was pressed and released
onkeyup	CDATA	#IMPLIED	script expression; a key was released
onmousedown	CDATA	#IMPLIED	script expression; a pointer button was pressed down
onmousemove	CDATA	#IMPLIED	script expression; a pointer was moved within
onmouseout	CDATA	#IMPLIED	script expression; a pointer was moved away
onmouseover	CDATA	#IMPLIED	script expression; a pointer was moved onto
onmouseup	CDATA	#IMPLIED	script expression; a pointer button was released
style	CDATA	#IMPLIED	style sheet data; associated style info
title	CDATA	#IMPLIED	text; advisory title

Content

( #PCDATA | TT | I | B | BIG | SMALL | EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE | ABBR | ACRONYM | A | IMG | OBJECT | BR | SCRIPT | MAP | Q | SUB | SUP | SPAN | BDO | INPUT | SELECT | TEXTAREA | LABEL | BUTTON )*

End tag

Required </H1>

Referenced in

BLOCKQUOTE BODY BUTTON DD DEL DIV FIELDSET FORM INS LI MAP NOSCRIPT OBJECT TD TH

Example

Source

Appearance

<H1>The Universe</H1>

<H2>The Milky Way Galaxy</H2>

<H3>Our Local Group of Stars</H3>

<H4>Our Solar System</H4>

<H5>Earth</H5>

<H6>North America</H6>