HTML Attributes

  • HTML elements can have attributes
  • Attributes provide additional information about an element
  • Attributes are always specified in the start tag
  • Attributes come in name/value pairs like: name=”value”

Attribute Example

HTML links are defined with the <a> tag. The link address is specified in the href attribute:

Example

<a href=”http://www.w3schools.com”>This is a link</a>

Always Quote Attribute Values

Attribute values should always be enclosed in quotes.

Double style quotes are the most common, but single style quotes are also allowed.

Remark Tip: In some rare situations, when the attribute value itself contains quotes, it is necessary to use single quotes: name=’John “ShotGun” Nelson’


HTML Tip: Use Lowercase Attributes

Attribute names and attribute values are case-insensitive.

However, the World Wide Web Consortium (W3C) recommends lowercase attributes/attribute values in their HTML 4 recommendation.

Newer versions of (X)HTML will demand lowercase attributes.


HTML Attributes Reference

A complete list of legal attributes for each HTML element is listed in our:

Ordered Alphabetically

DTD: indicates in which HTML 4.01 / XHTML 1.0 DTD the tag is allowed. S=Strict, T=Transitional, and F=Frameset

Tag Description DTD
<!–…–> Defines a comment STF
<!DOCTYPE> Defines the document type STF
<a> Defines an anchor STF
<abbr> Defines an abbreviation STF
<acronym> Defines an acronym STF
<address> Defines contact information for the author/owner of a document STF
<applet> Deprecated. Defines an embedded applet TF
<area /> Defines an area inside an image-map STF
<b> Defines bold text STF
<base /> Defines a default address or a default target for all links on a page STF
<basefont /> Deprecated. Defines a default font, color, or size for the text in a page TF
<bdo> Defines the text direction STF
<big> Defines big text STF
<blockquote> Defines a long quotation STF
<body> Defines the document’s body STF
<br /> Defines a single line break STF
<button> Defines a push button STF
<caption> Defines a table caption STF
<center> Deprecated. Defines centered text TF
<cite> Defines a citation STF
<code> Defines computer code text STF
<col /> Defines attribute values for one or more columns in a table STF
<colgroup> Defines a group of columns in a table for formatting STF
<dd> Defines a description of a term in a definition list STF
<del> Defines deleted text STF
<dfn> Defines a definition term STF
<dir> Deprecated. Defines a directory list TF
<div> Defines a section in a document STF
<dl> Defines a definition list STF
<dt> Defines a term (an item) in a definition list STF
<em> Defines emphasized text STF
<fieldset> Defines a border around elements in a form STF
<font> Deprecated. Defines font, color, and size for text TF
<form> Defines an HTML form for user input STF
<frame /> Defines a window (a frame) in a frameset F
<frameset> Defines a set of frames F
<h1> to <h6> Defines HTML headings STF
<head> Defines information about the document STF
<hr /> Defines a horizontal line STF
<html> Defines an HTML document STF
<i> Defines italic text STF
<iframe> Defines an inline frame TF
<img /> Defines an image STF
<input /> Defines an input control STF
<ins> Defines inserted text STF
<isindex> Deprecated. Defines a searchable index related to a document TF
<kbd> Defines keyboard text STF
<label> Defines a label for an input element STF
<legend> Defines a caption for a fieldset element STF
<li> Defines a list item STF
<link /> Defines the relationship between a document and an external resource STF
<map> Defines an image-map STF
<menu> Deprecated. Defines a menu list TF
<meta /> Defines metadata about an HTML document STF
<noframes> Defines an alternate content for users that do not support frames TF
<noscript> Defines an alternate content for users that do not support client-side scripts STF
<object> Defines an embedded object STF
<ol> Defines an ordered list STF
<optgroup> Defines a group of related options in a select list STF
<option> Defines an option in a select list STF
<p> Defines a paragraph STF
<param /> Defines a parameter for an object STF
<pre> Defines preformatted text STF
<q> Defines a short quotation STF
<s> Deprecated. Defines strikethrough text TF
<samp> Defines sample computer code STF
<script> Defines a client-side script STF
<select> Defines a select list (drop-down list) STF
<small> Defines small text STF
<span> Defines a section in a document STF
<strike> Deprecated. Defines strikethrough text TF
<strong> Defines strong text STF
<style> Defines style information for a document STF
<sub> Defines subscripted text STF
<sup> Defines superscripted text STF
<table> Defines a table STF
<tbody> Groups the body content in a table STF
<td> Defines a cell in a table STF
<textarea> Defines a multi-line text input control STF
<tfoot> Groups the footer content in a table STF
<th> Defines a header cell in a table STF
<thead> Groups the header content in a table STF
<title> Defines the title of a document STF
<tr> Defines a row in a table STF
<tt> Defines teletype text STF
<u> Deprecated. Defines underlined text TF
<ul> Defines an unordered list STF
<var> Defines a variable part of a text STF
<xmp> Deprecated. Defines preformatted text

Below is a list of some attributes that are standard for most HTML elements:

Attribute Value Description
class classname Specifies a classname for an element
id id Specifies a unique id for an element
style style_definition Specifies an inline style for an element
title tooltip_text Specifies extra information about an element (displayed as a tool tip)

For more information about standard attributes:

The attributes listed below are standard, and are supported by all HTML and XHTML tags, with a few exceptions.


Core Attributes

Not valid in base, head, html, meta, param, script, style, and title elements.

Attribute Value Description
class classname Specifies a classname for an element
id id Specifies a unique id for an element
style style_definition Specifies an inline style for an element
title text Specifies extra information about an element

Language Attributes

Not valid in base, br, frame, frameset, hr, iframe, param, and script elements.

Attribute Value Description
dir ltr
rtl
Specifies the text direction for the content in an element
lang language_code Specifies a language code for the content in an element. Language code reference
xml:lang language_code Specifies a language code for the content in an element, in XHTML documents. Language code reference

Keyboard Attributes

Attribute Value Description
accesskey character Specifies a keyboard shortcut to access an element
tabindex number Specifies the tab order of an element


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