List of attributes (excluding event handler content attributes)

Attribute	Element(s)	Description	Value
abbr	th	Alternative label to use for the header cell when referencing the cell in other contexts	Text*
accept	input	Hint for expected file type in file upload controls	Set of comma-separated tokens* consisting of valid MIME types with no parameters or audio/*, video/*, or image/*
accept-charset	form	Character encodings to use for form submission	Ordered set of unique space-separated tokens, ASCII case-insensitive, consisting of labels of ASCII-compatible character encodings*
accesskey	HTML elements	Keyboard shortcut to activate or focus element	Ordered set of unique space-separated tokens, case-sensitive, consisting of one Unicode code point in length
action	form	URL to use for form submission	Valid non-empty URL potentially surrounded by spaces
alt	area; img; input	Replacement text for use when images are not available	Text*
async	script	Execute script asynchronously	Boolean attribute
autocomplete	form	Default setting for autofill feature for controls in the form	"on"; "off"
autocomplete	input; select; textarea	Hint for form autofill feature	Autofill field name and related tokens*
autofocus	button; input; keygen; select; textarea	Automatically focus the form control when the page is loaded	Boolean attribute
autoplay	audio; video	Hint that the media resource can be started automatically when the page is loaded	Boolean attribute
border	table	Explicit indication that the table element is not being used for layout purposes	The empty string, or "1"
challenge	keygen	String to package with the generated and signed public key	Text
charset	meta	Character encoding declaration	Encoding label*
charset	script	Character encoding of the external script resource	Encoding label*
checked	input	Whether the control is checked	Boolean attribute
cite	blockquote; del; ins; q	Link to the source of the quotation or more information about the edit	Valid URL potentially surrounded by spaces
class	HTML elements	Classes to which the element belongs	Set of space-separated tokens
cols	textarea	Maximum number of characters per line	Valid non-negative integer greater than zero
colspan	td; th	Number of columns that the cell is to span	Valid non-negative integer greater than zero
content	meta	Value of the element	Text*
contenteditable	HTML elements	Whether the element is editable	"true"; "false"
controls	audio; video	Show user agent controls	Boolean attribute
coords	area	Coordinates for the shape to be created in an image map	Valid list of integers*
crossorigin	audio; img; link; script; video	How the element handles crossorigin requests	"anonymous"; "use-credentials"
data	object	Address of the resource	Valid non-empty URL potentially surrounded by spaces
datetime	del; ins	Date and (optionally) time of the change	Valid date string with optional time
datetime	time	Machine-readable value	Valid month string, valid date string, valid yearless date string, valid time string, valid floating date and time string, valid time-zone offset string, valid global date and time string, valid week string, valid non-negative integer, or valid duration string
default	track	Enable the track if no other text track is more suitable	Boolean attribute
defer	script	Defer script execution	Boolean attribute
dir	HTML elements	The text directionality of the element	"ltr"; "rtl"; "auto"
dir	bdo	The text directionality of the element	"ltr"; "rtl"
dirname	input; textarea	Name of form field to use for sending the element's directionality in form submission	Text*
disabled	button; fieldset; input; keygen; optgroup; option; select; textarea	Whether the form control is disabled	Boolean attribute
download	a; area	Whether to download the resource instead of navigating to it, and its file name if so	Text
enctype	form	Form data set encoding type to use for form submission	"application/x-www-form-urlencoded"; "multipart/form-data"; "text/plain"
for	label	Associate the label with form control	ID*
for	output	Specifies controls from which the output was calculated	Unordered set of unique space-separated tokens, case-sensitive, consisting of IDs*
form	button; fieldset; input; keygen; label; object; output; select; textarea	Associates the control with a form element	ID*
formaction	button; input	URL to use for form submission	Valid non-empty URL potentially surrounded by spaces
formenctype	button; input	Form data set encoding type to use for form submission	"application/x-www-form-urlencoded"; "multipart/form-data"; "text/plain"
formmethod	button; input	HTTP method to use for form submission	"GET"; "POST"
formnovalidate	button; input	Bypass form control validation for form submission	Boolean attribute
formtarget	button; input	Browsing context for form submission	Valid browsing context name or keyword
headers	td; th	The header cells for this cell	Unordered set of unique space-separated tokens, case-sensitive, consisting of IDs*
height	canvas; embed; iframe; img; input; object; video	Vertical dimension	Valid non-negative integer
hidden	HTML elements	Whether the element is relevant	Boolean attribute
high	meter	Low limit of high range	Valid floating-point number*
href	a; area	Address of the hyperlink	Valid URL potentially surrounded by spaces
href	link	Address of the hyperlink	Valid non-empty URL potentially surrounded by spaces
href	base	Document base URL	Valid URL potentially surrounded by spaces
hreflang	a; area; link	Language of the linked resource	Valid BCP 47 language tag
http-equiv	meta	Pragma directive	Text*
id	HTML elements	The element's ID	Text*
ismap	img	Whether the image is a server-side image map	Boolean attribute
keytype	keygen	The type of cryptographic key to generate	Text*
kind	track	The type of text track	"subtitles"; "captions"; "descriptions"; "chapters"; "metadata"
label	optgroup; option; track	User-visible label	Text
lang	HTML elements	Language of the element	Valid BCP 47 language tag or the empty string
list	input	List of autocomplete options	ID*
loop	audio; video	Whether to loop the media resource	Boolean attribute
low	meter	High limit of low range	Valid floating-point number*
manifest	html	Application cache manifest	Valid non-empty URL potentially surrounded by spaces
max	input	Maximum value	Varies*
max	meter; progress	Upper bound of range	Valid floating-point number*
maxlength	input; textarea	Maximum length of value	Valid non-negative integer
media	link; source; style	Applicable media	Valid media query
mediagroup	audio; video	Groups media elements together with an implicit MediaController	Text
method	form	HTTP method to use for form submission	"GET"; "POST";
min	input	Minimum value	Varies*
min	meter	Lower bound of range	Valid floating-point number*
minlength	input; textarea	Minimum length of value	Valid non-negative integer
multiple	input; select	Whether to allow multiple values	Boolean attribute
muted	audio; video	Whether to mute the media resource by default	Boolean attribute
name	button; fieldset; input; keygen; output; select; textarea	Name of form control to use for form submission and in the form.elements API	Text*
name	form	Name of form to use in the document.forms API	Text*
name	iframe; object	Name of nested browsing context	Valid browsing context name or keyword
name	map	Name of image map to reference from the usemap attribute	Text*
name	meta	Metadata name	Text*
name	param	Name of parameter	Text
novalidate	form	Bypass form control validation for form submission	Boolean attribute
optimum	meter	Optimum value in gauge	Valid floating-point number*
pattern	input	Pattern to be matched by the form control's value	Regular expression matching the JavaScript Pattern production
placeholder	input; textarea	User-visible label to be placed within the form control	Text*
poster	video	Poster frame to show prior to video playback	Valid non-empty URL potentially surrounded by spaces
preload	audio; video	Hints how much buffering the media resource will likely need	"none"; "metadata"; "auto"
readonly	input; textarea	Whether to allow the value to be edited by the user	Boolean attribute
rel	a; area; link	Relationship between the document containing the hyperlink and the destination resource	Set of space-separated tokens*
required	input; select; textarea	Whether the control is required for form submission	Boolean attribute
reversed	ol	Number the list backwards	Boolean attribute
rows	textarea	Number of lines to show	Valid non-negative integer greater than zero
rowspan	td; th	Number of rows that the cell is to span	Valid non-negative integer
sandbox	iframe	Security rules for nested content	Unordered set of unique space-separated tokens, ASCII case-insensitive, consisting of "allow-forms", "allow-pointer-lock", "allow-popups", "allow-same-origin", "allow-scripts and "allow-top-navigation"
spellcheck	HTML elements	Whether the element is to have its spelling and grammar checked	"true"; "false"
scope	th	Specifies which cells the header cell applies to	"row"; "col"; "rowgroup"; "colgroup"
selected	option	Whether the option is selected by default	Boolean attribute
shape	area	The kind of shape to be created in an image map	"circle"; "default"; "poly"; "rect"
size	input; select	Size of the control	Valid non-negative integer greater than zero
sizes	link	Sizes of the icons (for rel="icon")	Unordered set of unique space-separated tokens, ASCII case-insensitive, consisting of sizes*
span	col; colgroup	Number of columns spanned by the element	Valid non-negative integer greater than zero
src	audio; embed; iframe; img; input; script; source; track; video	Address of the resource	Valid non-empty URL potentially surrounded by spaces
srcdoc	iframe	A document to render in the iframe	The source of an iframe srcdoc document*
srclang	track	Language of the text track	Valid BCP 47 language tag
start	ol	Ordinal value of the first item	Valid integer
step	input	Granularity to be matched by the form control's value	Valid floating-point number greater than zero, or "any"
style	HTML elements	Presentational and formatting instructions	CSS declarations*
tabindex	HTML elements	Whether the element is focusable, and the relative order of the element for the purposes of sequential focus navigation	Valid integer
target	a; area	Browsing context for hyperlink navigation	Valid browsing context name or keyword
target	base	Default browsing context for hyperlink navigation and form submission	Valid browsing context name or keyword
target	form	Browsing context for form submission	Valid browsing context name or keyword
title	HTML elements	Advisory information for the element	Text
title	abbr; dfn	Full term or expansion of abbreviation	Text
title	input	Description of pattern (when used with pattern attribute)	Text
title	link	Title of the link	Text
title	link; style	Alternative style sheet set name	Text
translate	HTML elements	Whether the element is to be translated when the page is localized	"yes"; "no"
type	a; area; link	Hint for the type of the referenced resource	Valid MIME type
type	button	Type of button	"submit"; "reset"; "button"
type	embed; object; script; source; style	Type of embedded resource	Valid MIME type
type	input	Type of form control	input type keyword
type	ol	Kind of list marker	"1"; "a"; "A"; "i"; "I"
typemustmatch	object	Whether the type attribute and the Content-Type value need to match for the resource to be used	Boolean attribute
usemap	img; object	Name of image map to use	Valid hash-name reference*
value	button; option	Value to be used for form submission	Text
value	data	Machine-readable value	Text*
value	input	Value of the form control	Varies*
value	li	Ordinal value of the list item	Valid integer
value	meter; progress	Current value of the element	Valid floating-point number
value	param	Value of parameter	Text
width	canvas; embed; iframe; img; input; object; video	Horizontal dimension	Valid non-negative integer
wrap	textarea	How the value of the form control is to be wrapped for form submission	"soft"; "hard"