Index

Elements

List of elements
Element	Description	Categories	Parents†	Children	Attributes	Interface
`a`	Hyperlink	flow; phrasing*; interactive	phrasing	transparent*	globals; `href`; `target`; `download`; `ping`; `rel`; `media`; `hreflang`; `type`	`HTMLAnchorElement`
`abbr`	Abbreviation	flow; phrasing	phrasing	phrasing	globals	`HTMLElement`
`address`	Contact information for a page or `article` element	flow	flow	flow*	globals	`HTMLElement`
`area`	Hyperlink or dead area on an image map	flow; phrasing	phrasing*	empty	globals; `alt`; `coords`; `shape`; `href`; `target`; `download`; `ping`; `rel`; `media`; `hreflang`; `type`	`HTMLAreaElement`
`article`	Self-contained syndicatable or reusable composition	flow; sectioning	flow	flow	globals	`HTMLElement`
`aside`	Sidebar for tangentially related content	flow; sectioning	flow	flow	globals	`HTMLElement`
`audio`	Audio player	flow; phrasing; embedded; interactive	phrasing	`source`; transparent	globals; `src`; `crossorigin`; `preload`; `autoplay`; `mediagroup`; `loop`; `muted`; `controls`	`HTMLAudioElement`
`b`	Keywords	flow; phrasing	phrasing	phrasing	globals	`HTMLElement`
`base`	Base URL and default target browsing context for hyperlinks and forms	metadata	`head`	empty	globals; `href`; `target`	`HTMLBaseElement`
`bdi`	Text directionality isolation	flow; phrasing	phrasing	phrasing	globals	`HTMLElement`
`bdo`	Text directionality formatting	flow; phrasing	phrasing	phrasing	globals	`HTMLElement`
`blockquote`	A section quoted from another source	flow; sectioning root	flow	flow	globals; `cite`	`HTMLQuoteElement`
`body`	Document body	sectioning root	`html`	flow	globals; `onafterprint`; `onbeforeprint`; `onbeforeunload`; `onblur`; `onerror`; `onfocus`; `onhashchange`; `onload`; `onmessage`; `onoffline`; `ononline`; `onpagehide`; `onpageshow`; `onpopstate`; `onresize`; `onscroll`; `onstorage`; `onunload`	`HTMLBodyElement`
`br`	Line break, e.g. in poem or postal address	flow; phrasing	phrasing	empty	globals	`HTMLBRElement`
`button`	Button control	flow; phrasing; interactive; listed; labelable; submittable; form-associated	phrasing	phrasing*	globals; `autofocus`; `disabled`; `form`; `formaction`; `formenctype`; `formmethod`; `formnovalidate`; `formtarget`; `name`; `type`; `value`	`HTMLButtonElement`
`canvas`	Scriptable bitmap canvas	flow; phrasing; embedded	phrasing	transparent	globals; `width`; `height`	`HTMLCanvasElement`
`caption`	Table caption	none	`table`	flow*	globals	`HTMLTableCaptionElement`
`cite`	Title of a work	flow; phrasing	phrasing	phrasing	globals	`HTMLElement`
`code`	Computer code	flow; phrasing	phrasing	phrasing	globals	`HTMLElement`
`col`	Table column	none	`colgroup`	empty	globals; `span`	`HTMLTableColElement`
`colgroup`	Group of columns in a table	none	`table`	`col`	globals; `span`	`HTMLTableColElement`
`command`	Menu command	metadata; flow; phrasing	`head`; phrasing	empty	globals; `type`; `label`; `icon`; `disabled`; `checked`; `radiogroup`	`HTMLCommandElement`
`data`	Machine-readable equivalent	flow; phrasing	phrasing	phrasing	globals; `value`	`HTMLDataElement`
`datalist`	Container for options for combo box control	flow; phrasing	phrasing	phrasing; `option`	globals	`HTMLDataListElement`
`dd`	Content for corresponding `dt` element(s)	none	`dl`	flow	globals	`HTMLElement`
`del`	A removal from the document	flow; phrasing*	phrasing	transparent	globals; `cite`; `datetime`	`HTMLModElement`
`details`	Disclosure control for hiding details	flow; sectioning root; interactive	flow	`summary`*; flow	globals; `open`	`HTMLDetailsElement`
`dfn`	Defining instance	flow; phrasing	phrasing	phrasing*	globals	`HTMLElement`
`div`	Generic flow container	flow	flow	flow	globals	`HTMLDivElement`
`dl`	Association list consisting of zero or more name-value groups	flow	flow	`dt`; `dd`	globals	`HTMLDListElement`
`dt`	Legend for corresponding `dd` element(s)	none	`dl`	flow*	globals	`HTMLElement`
`em`	Stress emphasis	flow; phrasing	phrasing	phrasing	globals	`HTMLElement`
`embed`	Plugin	flow; phrasing; embedded; interactive	phrasing	empty	globals; `src`; `type`; `width`; `height`; any*	`HTMLEmbedElement`
`fieldset`	Group of form controls	flow; sectioning root; listed; form-associated	flow	`legend`*; flow	globals; `disabled`; `form`; `name`	`HTMLFieldSetElement`
`figcaption`	Caption for `figure`	none	`figure`	flow	globals	`HTMLElement`
`figure`	Figure with optional caption	flow; sectioning root	flow	`figcaption`*; flow	globals	`HTMLElement`
`footer`	Footer for a page or section	flow	flow	flow*	globals	`HTMLElement`
`form`	User-submittable form	flow	flow	flow*	globals; `accept-charset`; `action`; `autocomplete`; `enctype`; `method`; `name`; `novalidate`; `target`	`HTMLFormElement`
`h1`, `h2`, `h3`, `h4`, `h5`, `h6`	Section heading	flow; heading	`hgroup`; flow	phrasing	globals	`HTMLHeadingElement`
`head`	Container for document metadata	none	`html`	metadata content*	globals	`HTMLHeadElement`
`header`	Introductory or navigational aids for a page or section	flow	flow	flow*	globals	`HTMLElement`
`hgroup`	heading group	flow; heading	flow	One or more `h1`, `h2`, `h3`, `h4`, `h5`, and/or `h6`	globals	`HTMLElement`
`hr`	Thematic break	flow	flow	empty	globals	`HTMLHRElement`
`html`	Root element	none	none*	`head`; `body`	globals; `manifest`	`HTMLHtmlElement`
`i`	Alternate voice	flow; phrasing	phrasing	phrasing	globals	`HTMLElement`
`iframe`	Nested browsing context	flow; phrasing; embedded; interactive	phrasing	text*	globals; `src`; `srcdoc`; `name`; `sandbox`; `seamless`; `width`; `height`	`HTMLIFrameElement`
`img`	Image	flow; phrasing; embedded; interactive*	phrasing	empty	globals; `alt`; `src`; `crossorigin`; `usemap`; `ismap`; `width`; `height`	`HTMLImageElement`
`input`	Form control	flow; phrasing; interactive*; listed; labelable; submittable; resettable; form-associated	phrasing	empty	globals; `accept`; `alt`; `autocomplete`; `autofocus`; `checked`; `dirname`; `disabled`; `form`; `formaction`; `formenctype`; `formmethod`; `formnovalidate`; `formtarget`; `height`; `list`; `max`; `maxlength`; `min`; `multiple`; `name`; `pattern`; `placeholder`; `readonly`; `required`; `size`; `src`; `step`; `type`; `value`; `width`	`HTMLInputElement`
`ins`	An addition to the document	flow; phrasing*	phrasing	transparent	globals; `cite`; `datetime`	`HTMLModElement`
`kbd`	User input	flow; phrasing	phrasing	phrasing	globals	`HTMLElement`
`keygen`	Cryptographic key-pair generator form control	flow; phrasing; interactive; listed; labelable; submittable; resettable; form-associated	phrasing	empty	globals; `autofocus`; `challenge`; `disabled`; `form`; `keytype`; `name`	`HTMLKeygenElement`
`label`	Caption for a form control	flow; phrasing; interactive; form-associated	phrasing	phrasing*	globals; `form`; `for`	`HTMLLabelElement`
`legend`	Caption for `fieldset`	none	`fieldset`	phrasing	globals	`HTMLLegendElement`
`li`	List item	none	`ol`; `ul`; `menu`	flow	globals; `value`*	`HTMLLIElement`
`link`	Link metadata	metadata; flow; phrasing	`head`; `noscript`; phrasing	empty	globals; `href`; `rel`; `media`; `hreflang`; `type`; `sizes`	`HTMLLinkElement`
`map`	Image map	flow; phrasing*	phrasing	transparent; `area`*	globals; `name`	`HTMLMapElement`
`mark`	Highlight	flow; phrasing	phrasing	phrasing	globals	`HTMLElement`
`menu`	Menu of commands	flow; interactive*	flow	`li`*; flow	globals; `type`; `label`	`HTMLMenuElement`
`meta`	Text metadata	metadata; flow; phrasing	`head`; `noscript`; phrasing	empty	globals; `name`; `http-equiv`; `content`; `charset`	`HTMLMetaElement`
`meter`	Gauge	flow; phrasing; labelable	phrasing	phrasing*	globals; `value`; `min`; `max`; `low`; `high`; `optimum`; `form`	`HTMLMeterElement`
`nav`	Section with navigational links	flow; sectioning	flow	flow	globals	`HTMLElement`
`noscript`	Fallback content for script	metadata; flow; phrasing	`head`; phrasing	varies*	globals	`HTMLElement`
`object`	Image, nested browsing context, or plugin	flow; phrasing; embedded; interactive*; listed; submittable; form-associated	phrasing	`param`*; transparent	globals; `data`; `type`; `typemustmatch`; `name`; `usemap`; `form`; `width`; `height`	`HTMLObjectElement`
`ol`	Ordered list	flow	flow	`li`	globals; `reversed`; `start`	`HTMLOListElement`
`optgroup`	Group of options in a list box	none	`select`	`option`	globals; `disabled`; `label`	`HTMLOptGroupElement`
`option`	Option in a list box or combo box control	none	`select`; `datalist`; `optgroup`	text	globals; `disabled`; `label`; `selected`; `value`	`HTMLOptionElement`
`output`	Calculated output value	flow; phrasing; listed; labelable; resettable; form-associated	phrasing	phrasing	globals; `for`; `form`; `name`	`HTMLOutputElement`
`p`	Paragraph	flow	flow	phrasing	globals	`HTMLParagraphElement`
`param`	Parameter for `object`	none	`object`	empty	globals; `name`; `value`	`HTMLParamElement`
`pre`	Block of preformatted text	flow	flow	phrasing	globals	`HTMLPreElement`
`progress`	Progress bar	flow; phrasing; labelable	phrasing	phrasing*	globals; `value`; `max`; `form`	`HTMLProgressElement`
`q`	Quotation	flow; phrasing	phrasing	phrasing	globals; `cite`	`HTMLQuoteElement`
`rp`	Parenthesis for ruby annotation text	none	`ruby`	phrasing	globals	`HTMLElement`
`rt`	Ruby annotation text	none	`ruby`	phrasing	globals	`HTMLElement`
`ruby`	Ruby annotation(s)	flow; phrasing	phrasing	phrasing; `rt`; `rp`*	globals	`HTMLElement`
`s`	Inaccurate text	flow; phrasing	phrasing	phrasing	globals	`HTMLElement`
`samp`	Computer output	flow; phrasing	phrasing	phrasing	globals	`HTMLElement`
`script`	Embedded script	metadata; flow; phrasing	`head`; phrasing	script, data, or script documentation*	globals; `src`; `async`; `defer`; `type`; `charset`	`HTMLScriptElement`
`section`	Generic document or application section	flow; sectioning	flow	flow	globals	`HTMLElement`
`select`	List box control	flow; phrasing; interactive; listed; labelable; submittable; resettable; form-associated	phrasing	`option`, `optgroup`	globals; `autofocus`; `disabled`; `form`; `multiple`; `name`; `required`; `size`	`HTMLSelectElement`
`small`	Side comment	flow; phrasing	phrasing	phrasing	globals	`HTMLElement`
`source`	Media source for `video` or `audio`	none	`video`; `audio`	empty	globals; `src`; `type`; `media`	`HTMLSourceElement`
`span`	Generic phrasing container	flow; phrasing	phrasing	phrasing	globals	`HTMLSpanElement`
`strong`	Importance	flow; phrasing	phrasing	phrasing	globals	`HTMLElement`
`style`	Embedded styling information	metadata; flow	`head`; `noscript`; flow	varies*	globals; `media`; `type`; `scoped`	`HTMLStyleElement`
`sub`	Subscript	flow; phrasing	phrasing	phrasing	globals	`HTMLElement`
`summary`	Caption for `details`	none	`details`	phrasing	globals	`HTMLElement`
`sup`	Superscript	flow; phrasing	phrasing	phrasing	globals	`HTMLElement`
`table`	Table	flow	flow	`caption`; `colgroup`; `thead`; `tbody`; `tfoot`; `tr`	globals; `border`	`HTMLTableElement`
`tbody`	Group of rows in a table	none	`table`	`tr`	globals	`HTMLTableSectionElement`
`td`	Table cell	sectioning root	`tr`	flow	globals; `colspan`; `rowspan`; `headers`	`HTMLTableDataCellElement`
`textarea`	Multiline text field	flow; phrasing; interactive; listed; labelable; submittable; resettable; form-associated	phrasing	text	globals; `autofocus`; `cols`; `dirname`; `disabled`; `form`; `maxlength`; `name`; `placeholder`; `readonly`; `required`; `rows`; `wrap`	`HTMLTextAreaElement`
`tfoot`	Group of footer rows in a table	none	`table`	`tr`	globals	`HTMLTableSectionElement`
`th`	Table header cell	none	`tr`	flow*	globals; `colspan`; `rowspan`; `headers`; `scope`	`HTMLTableHeaderCellElement`
`thead`	Group of heading rows in a table	none	`table`	`tr`	globals	`HTMLTableSectionElement`
`time`	Machine-readable equivalent of date- or time-related data	flow; phrasing	phrasing	phrasing	globals; `datetime`	`HTMLTimeElement`
`title`	Document title	metadata	`head`	text	globals	`HTMLTitleElement`
`tr`	Table row	none	`table`; `thead`; `tbody`; `tfoot`	`th`*; `td`	globals	`HTMLTableRowElement`
`track`	Timed text track	none	`audio`; `video`	empty	globals; `default`; `kind`; `label`; `src`; `srclang`	`HTMLTrackElement`
`u`	Keywords	flow; phrasing	phrasing	phrasing	globals	`HTMLElement`
`ul`	List	flow	flow	`li`	globals	`HTMLUListElement`
`var`	Variable	flow; phrasing	phrasing	phrasing	globals	`HTMLElement`
`video`	Video player	flow; phrasing; embedded; interactive	phrasing	`source`; transparent	globals; `src`; `crossorigin`; `poster`; `preload`; `autoplay`; `mediagroup`; `loop`; `muted`; `controls`; `width`; `height`	`HTMLVideoElement`
`wbr`	Line breaking opportunity	flow; phrasing	phrasing	empty	globals	`HTMLElement`

An asterisk (*) in a cell indicates that the actual rules are more complicated than indicated in the table above.

† Categories in the "Parents" column refer to parents that list the given categories in their content model, not to elements that themselves are in those categories. For example, the a element's "Parents" column says "phrasing", so any element whose content model contains the "phrasing" category could be a parent of an a element. Since the "flow" category includes all the "phrasing" elements, that means the address element could be a parent to an a element.

Element content categories

List of element content categories
Category	Elements	Elements with exceptions
Metadata content	`base`; `command`; `link`; `meta`; `noscript`; `script`; `style`; `title`	—
Flow content	`a`; `abbr`; `address`; `article`; `aside`; `audio`; `b`; `bdi`; `bdo`; `blockquote`; `br`; `button`; `canvas`; `cite`; `code`; `command`; `data`; `datalist`; `del`; `details`; `dfn`; `div`; `dl`; `em`; `embed`; `fieldset`; `figure`; `footer`; `form`; `h1`; `h2`; `h3`; `h4`; `h5`; `h6`; `header`; `hgroup`; `hr`; `i`; `iframe`; `img`; `input`; `ins`; `kbd`; `keygen`; `label`; `map`; `mark`; `math`; `menu`; `meter`; `nav`; `noscript`; `object`; `ol`; `output`; `p`; `pre`; `progress`; `q`; `ruby`; `s`; `samp`; `script`; `section`; `select`; `small`; `span`; `strong`; `sub`; `sup`; `svg`; `table`; `textarea`; `time`; `u`; `ul`; `var`; `video`; `wbr`; Text	`area` (if it is a descendant of a `map` element); `link` (if the `itemprop` attribute is present); `meta` (if the `itemprop` attribute is present); `style` (if the `scoped` attribute is present)
Sectioning content	`article`; `aside`; `nav`; `section`	—
Heading content	`h1`; `h2`; `h3`; `h4`; `h5`; `h6`; `hgroup`	—
Phrasing content	`abbr`; `audio`; `b`; `bdi`; `bdo`; `br`; `button`; `canvas`; `cite`; `code`; `command`; `data`; `datalist`; `dfn`; `em`; `embed`; `i`; `iframe`; `img`; `input`; `kbd`; `keygen`; `label`; `mark`; `math`; `meter`; `noscript`; `object`; `output`; `progress`; `q`; `ruby`; `s`; `samp`; `script`; `select`; `small`; `span`; `strong`; `sub`; `sup`; `svg`; `textarea`; `time`; `u`; `var`; `video`; `wbr`; Text	`a` (if it contains only phrasing content); `area` (if it is a descendant of a `map` element); `del` (if it contains only phrasing content); `ins` (if it contains only phrasing content); `link` (if the `itemprop` attribute is present); `map` (if it contains only phrasing content); `meta` (if the `itemprop` attribute is present)
Embedded content	`audio` `canvas` `embed` `iframe` `img` `math` `object` `svg` `video`	—
Interactive content	`a`; `button`; `details`; `embed`; `iframe`; `keygen`; `label`; `select`; `textarea`;	`audio` (if the `controls` attribute is present); `img` (if the `usemap` attribute is present); `input` (if the `type` attribute is not in the Hidden state); `menu` (if the `type` attribute is in the toolbar state); `object` (if the `usemap` attribute is present); `video` (if the `controls` attribute is present)
Sectioning roots	`blockquote`; `body`; `details`; `fieldset`; `figure`; `td`	—
Form-associated elements	`button`; `fieldset`; `input`; `keygen`; `label`; `object`; `output`; `select`; `textarea`	—
Listed elements	`button`; `fieldset`; `input`; `keygen`; `object`; `output`; `select`; `textarea`	—
Submittable elements	`button`; `input`; `keygen`; `object`; `select`; `textarea`	—
Resettable elements	`input`; `keygen`; `output`; `select`; `textarea`	—
Labelable elements	`button`; `input`; `keygen`; `meter`; `output`; `progress`; `select`; `textarea`	—
Palpable content	`a`; `abbr`; `address`; `article`; `aside`; `b`; `bdi`; `bdo`; `blockquote`; `button`; `canvas`; `cite`; `code`; `data`; `details`; `dfn`; `div`; `em`; `embed`; `fieldset`; `figure`; `footer`; `form`; `h1`; `h2`; `h3`; `h4`; `h5`; `h6`; `header`; `hgroup`; `i`; `iframe`; `img`; `ins`; `kbd`; `keygen`; `label`; `map`; `mark`; `math`; `meter`; `nav`; `object`; `output`; `p`; `pre`; `progress`; `q`; `ruby`; `s`; `samp`; `section`; `select`; `small`; `span`; `strong`; `sub`; `sup`; `svg`; `table`; `textarea`; `time`; `u`; `var`; `video`	`audio` (if the `controls` attribute is present); `dl` (if the element's children include at least one name-value group); `input` (if the `type` attribute is not in the Hidden state); `menu` (if the `type` attribute is in the toolbar state or the list state); `ol` (if the element's children include at least one `li` element); `ul` (if the element's children include at least one `li` element); Text that is not inter-element whitespace

Attributes

List of attributes (excluding event handler content attributes)
Attribute	Element(s)	Description	Value
`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 preferred MIME names 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`; `input`	Prevent the user agent from providing autocompletions for the form control(s)	"`on`"; "`off`"
`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	Preferred MIME name of an encoding*
`charset`	`script`	Character encoding of the external script resource	Preferred MIME name of an encoding*
`checked`	`command`; `input`	Whether the command or 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`"
`contextmenu`	HTML elements	The element's context menu	ID*
`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`; `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 local 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`"
`dirname`	`input`; `textarea`	Name of form field to use for sending the element's directionality in form submission	Text*
`disabled`	`button`; `command`; `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 filename if so	Text
`draggable`	HTML elements	Whether the element is draggable	"`true`"; "`false`"
`dropzone`	HTML elements	Accepted item types for drag-and-drop	Unordered set of unique space-separated tokens, ASCII case-insensitive, consisting of accepted types and drag feedback*
`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*
`icon`	`command`	Icon for the command	Valid non-empty URL potentially surrounded by spaces
`id`	HTML elements	The element's ID	Text*
`ismap`	`img`	Whether the image is a server-side image map	Boolean attribute
`itemid`	HTML elements	Global identifier for a microdata item	Valid URL potentially surrounded by spaces
`itemprop`	HTML elements	Property names of a microdata item	Unordered set of unique space-separated tokens, case-sensitive, consisting of valid absolute URLs, defined property names, or text*
`itemref`	HTML elements	Referenced elements	Unordered set of unique space-separated tokens, case-sensitive, consisting of IDs*
`itemscope`	HTML elements	Introduces a microdata item	Boolean attribute
`itemtype`	HTML elements	Item types of a microdata item	Unordered set of unique space-separated tokens, case-sensitive, consisting of valid absolute URL*
`keytype`	`keygen`	The type of cryptographic key to generate	Text*
`kind`	`track`	The type of text track	"`subtitles`"; "`captions`"; "`descriptions`"; "`chapters`"; "`metadata`"
`label`	`command`; `menu`; `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`	`a`; `area`; `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*
`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
`open`	`details`	Whether the details are visible	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
`ping`	`a`; `area`	URLs to ping	Set of space-separated tokens consisting of valid non-empty URLs
`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`"
`radiogroup`	`command`	Name of group of commands to treat as a radio button group	Text
`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-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`"
`scoped`	`style`	Whether the styles apply to the entire document or just the parent subtree	Boolean attribute
`seamless`	`iframe`	Whether to apply the document's styles to the nested content	Boolean attribute
`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`	`command`	Hint describing the command	Text
`title`	`link`	Title of the link	Text
`title`	`link`; `style`	Alternative style sheet set name	Text
`type`	`a`; `area`; `link`	Hint for the type of the referenced resource	Valid MIME type
`type`	`button`	Type of button	"`submit`"; "`reset`"; "`button`"
`type`	`command`	Type of command	"`command`"; "`checkbox`"; "`radio`"
`type`	`embed`; `object`; `script`; `source`; `style`	Type of embedded resource	Valid MIME type
`type`	`input`	Type of form control	`input` type keyword
`type`	`menu`	Type of menu	"`context`"; "`toolbar`"
`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`"

An asterisk (*) in a cell indicates that the actual rules are more complicated than indicated in the table above.

List of event handler content attributes
Attribute	Element(s)	Description	Value
`onabort`	HTML elements	`abort` event handler	Event handler content attribute
`onafterprint`	`body`	`afterprint` event handler for `Window` object	Event handler content attribute
`onbeforeprint`	`body`	`beforeprint` event handler for `Window` object	Event handler content attribute
`onbeforeunload`	`body`	`beforeunload` event handler for `Window` object	Event handler content attribute
`onblur`	`body`	`blur` event handler for `Window` object	Event handler content attribute
`onblur`	HTML elements	`blur` event handler	Event handler content attribute
`oncanplay`	HTML elements	`canplay` event handler	Event handler content attribute
`oncanplaythrough`	HTML elements	`canplaythrough` event handler	Event handler content attribute
`onchange`	HTML elements	`change` event handler	Event handler content attribute
`onclick`	HTML elements	`click` event handler	Event handler content attribute
`oncontextmenu`	HTML elements	`contextmenu` event handler	Event handler content attribute
`oncuechange`	HTML elements	`cuechange` event handler	Event handler content attribute
`ondblclick`	HTML elements	`dblclick` event handler	Event handler content attribute
`ondrag`	HTML elements	`drag` event handler	Event handler content attribute
`ondragend`	HTML elements	`dragend` event handler	Event handler content attribute
`ondragenter`	HTML elements	`dragenter` event handler	Event handler content attribute
`ondragleave`	HTML elements	`dragleave` event handler	Event handler content attribute
`ondragover`	HTML elements	`dragover` event handler	Event handler content attribute
`ondragstart`	HTML elements	`dragstart` event handler	Event handler content attribute
`ondrop`	HTML elements	`drop` event handler	Event handler content attribute
`ondurationchange`	HTML elements	`durationchange` event handler	Event handler content attribute
`onemptied`	HTML elements	`emptied` event handler	Event handler content attribute
`onended`	HTML elements	`ended` event handler	Event handler content attribute
`onerror`	`body`	`error` event handler for `Window` object, and handler for script error notifications	Event handler content attribute
`onerror`	HTML elements	`error` event handler	Event handler content attribute
`onfocus`	`body`	`focus` event handler for `Window` object	Event handler content attribute
`onfocus`	HTML elements	`focus` event handler	Event handler content attribute
`onhashchange`	`body`	`hashchange` event handler for `Window` object	Event handler content attribute
`oninput`	HTML elements	`input` event handler	Event handler content attribute
`oninvalid`	HTML elements	`invalid` event handler	Event handler content attribute
`onkeydown`	HTML elements	`keydown` event handler	Event handler content attribute
`onkeypress`	HTML elements	`keypress` event handler	Event handler content attribute
`onkeyup`	HTML elements	`keyup` event handler	Event handler content attribute
`onload`	`body`	`load` event handler for `Window` object	Event handler content attribute
`onload`	HTML elements	`load` event handler	Event handler content attribute
`onloadeddata`	HTML elements	`loadeddata` event handler	Event handler content attribute
`onloadedmetadata`	HTML elements	`loadedmetadata` event handler	Event handler content attribute
`onloadstart`	HTML elements	`loadstart` event handler	Event handler content attribute
`onmessage`	`body`	`message` event handler for `Window` object	Event handler content attribute
`onmousedown`	HTML elements	`mousedown` event handler	Event handler content attribute
`onmousemove`	HTML elements	`mousemove` event handler	Event handler content attribute
`onmouseout`	HTML elements	`mouseout` event handler	Event handler content attribute
`onmouseover`	HTML elements	`mouseover` event handler	Event handler content attribute
`onmouseup`	HTML elements	`mouseup` event handler	Event handler content attribute
`onmousewheel`	HTML elements	`mousewheel` event handler	Event handler content attribute
`onoffline`	`body`	`offline` event handler for `Window` object	Event handler content attribute
`ononline`	`body`	`online` event handler for `Window` object	Event handler content attribute
`onpagehide`	`body`	`pagehide` event handler for `Window` object	Event handler content attribute
`onpageshow`	`body`	`pageshow` event handler for `Window` object	Event handler content attribute
`onpause`	HTML elements	`pause` event handler	Event handler content attribute
`onplay`	HTML elements	`play` event handler	Event handler content attribute
`onplaying`	HTML elements	`playing` event handler	Event handler content attribute
`onpopstate`	`body`	`popstate` event handler for `Window` object	Event handler content attribute
`onprogress`	HTML elements	`progress` event handler	Event handler content attribute
`onratechange`	HTML elements	`ratechange` event handler	Event handler content attribute
`onreset`	HTML elements	`reset` event handler	Event handler content attribute
`onresize`	`body`	`resize` event handler for `Window` object	Event handler content attribute
`onscroll`	`body`	`scroll` event handler for `Window` object	Event handler content attribute
`onscroll`	HTML elements	`scroll` event handler	Event handler content attribute
`onseeked`	HTML elements	`seeked` event handler	Event handler content attribute
`onseeking`	HTML elements	`seeking` event handler	Event handler content attribute
`onselect`	HTML elements	`select` event handler	Event handler content attribute
`onshow`	HTML elements	`show` event handler	Event handler content attribute
`onstalled`	HTML elements	`stalled` event handler	Event handler content attribute
`onstorage`	`body`	`storage` event handler for `Window` object	Event handler content attribute
`onsubmit`	HTML elements	`submit` event handler	Event handler content attribute
`onsuspend`	HTML elements	`suspend` event handler	Event handler content attribute
`ontimeupdate`	HTML elements	`timeupdate` event handler	Event handler content attribute
`onunload`	`body`	`unload` event handler for `Window` object	Event handler content attribute
`onvolumechange`	HTML elements	`volumechange` event handler	Event handler content attribute
`onwaiting`	HTML elements	`waiting` event handler	Event handler content attribute

Interfaces

List of interfaces for elements
Element(s)	Interface(s)
`a`	`HTMLAnchorElement` : `HTMLElement`
`abbr`	`HTMLElement`
`address`	`HTMLElement`
`area`	`HTMLAreaElement` : `HTMLElement`
`article`	`HTMLElement`
`aside`	`HTMLElement`
`audio`	`HTMLAudioElement` : `HTMLMediaElement` : `HTMLElement`
`b`	`HTMLElement`
`base`	`HTMLBaseElement` : `HTMLElement`
`bdi`	`HTMLElement`
`bdo`	`HTMLElement`
`blockquote`	`HTMLQuoteElement` : `HTMLElement`
`body`	`HTMLBodyElement` : `HTMLElement`
`br`	`HTMLBRElement` : `HTMLElement`
`button`	`HTMLButtonElement` : `HTMLElement`
`canvas`	`HTMLCanvasElement` : `HTMLElement`
`caption`	`HTMLTableCaptionElement` : `HTMLElement`
`cite`	`HTMLElement`
`code`	`HTMLElement`
`col`	`HTMLTableColElement` : `HTMLElement`
`colgroup`	`HTMLTableColElement` : `HTMLElement`
`command`	`HTMLCommandElement` : `HTMLElement`
`data`	`HTMLDataElement` : `HTMLElement`
`datalist`	`HTMLDataListElement` : `HTMLElement`
`dd`	`HTMLElement`
`del`	`HTMLModElement` : `HTMLElement`
`details`	`HTMLDetailsElement` : `HTMLElement`
`dfn`	`HTMLElement`
`div`	`HTMLDivElement` : `HTMLElement`
`dl`	`HTMLDListElement` : `HTMLElement`
`dt`	`HTMLElement`
`em`	`HTMLElement`
`embed`	`HTMLEmbedElement` : `HTMLElement`
`fieldset`	`HTMLFieldSetElement` : `HTMLElement`
`figcaption`	`HTMLElement`
`figure`	`HTMLElement`
`footer`	`HTMLElement`
`form`	`HTMLFormElement` : `HTMLElement`
`head`	`HTMLHeadElement` : `HTMLElement`
`h1`	`HTMLHeadingElement` : `HTMLElement`
`h2`	`HTMLHeadingElement` : `HTMLElement`
`h3`	`HTMLHeadingElement` : `HTMLElement`
`h4`	`HTMLHeadingElement` : `HTMLElement`
`h5`	`HTMLHeadingElement` : `HTMLElement`
`h6`	`HTMLHeadingElement` : `HTMLElement`
`header`	`HTMLElement`
`hgroup`	`HTMLElement`
`hr`	`HTMLHRElement` : `HTMLElement`
`html`	`HTMLHtmlElement` : `HTMLElement`
`i`	`HTMLElement`
`iframe`	`HTMLIFrameElement` : `HTMLElement`
`img`	`HTMLImageElement` : `HTMLElement`
`input`	`HTMLInputElement` : `HTMLElement`
`ins`	`HTMLModElement` : `HTMLElement`
`kbd`	`HTMLElement`
`keygen`	`HTMLKeygenElement` : `HTMLElement`
`label`	`HTMLLabelElement` : `HTMLElement`
`legend`	`HTMLLegendElement` : `HTMLElement`
`li`	`HTMLLIElement` : `HTMLElement`
`link`	`HTMLLinkElement` : `HTMLElement`
`map`	`HTMLMapElement` : `HTMLElement`
`mark`	`HTMLElement`
`menu`	`HTMLMenuElement` : `HTMLElement`
`meta`	`HTMLMetaElement` : `HTMLElement`
`meter`	`HTMLMeterElement` : `HTMLElement`
`nav`	`HTMLElement`
`noscript`	`HTMLElement`
`object`	`HTMLObjectElement` : `HTMLElement`
`ol`	`HTMLOListElement` : `HTMLElement`
`optgroup`	`HTMLOptGroupElement` : `HTMLElement`
`option`	`HTMLOptionElement` : `HTMLElement`
`output`	`HTMLOutputElement` : `HTMLElement`
`p`	`HTMLParagraphElement` : `HTMLElement`
`param`	`HTMLParamElement` : `HTMLElement`
`pre`	`HTMLPreElement` : `HTMLElement`
`progress`	`HTMLProgressElement` : `HTMLElement`
`q`	`HTMLQuoteElement` : `HTMLElement`
`rp`	`HTMLElement`
`rt`	`HTMLElement`
`ruby`	`HTMLElement`
`s`	`HTMLElement`
`samp`	`HTMLElement`
`script`	`HTMLScriptElement` : `HTMLElement`
`section`	`HTMLElement`
`select`	`HTMLSelectElement` : `HTMLElement`
`small`	`HTMLElement`
`source`	`HTMLSourceElement` : `HTMLElement`
`span`	`HTMLSpanElement` : `HTMLElement`
`strong`	`HTMLElement`
`style`	`HTMLStyleElement` : `HTMLElement`
`sub`	`HTMLElement`
`summary`	`HTMLElement`
`sup`	`HTMLElement`
`table`	`HTMLTableElement` : `HTMLElement`
`tbody`	`HTMLTableSectionElement` : `HTMLElement`
`td`	`HTMLTableDataCellElement` : `HTMLTableCellElement` : `HTMLElement`
`textarea`	`HTMLTextAreaElement` : `HTMLElement`
`tfoot`	`HTMLTableSectionElement` : `HTMLElement`
`th`	`HTMLTableHeaderCellElement` : `HTMLTableCellElement` : `HTMLElement`
`thead`	`HTMLTableSectionElement` : `HTMLElement`
`time`	`HTMLTimeElement` : `HTMLElement`
`title`	`HTMLTitleElement` : `HTMLElement`
`tr`	`HTMLTableRowElement` : `HTMLElement`
`track`	`HTMLTrackElement` : `HTMLElement`
`u`	`HTMLElement`
`ul`	`HTMLUListElement` : `HTMLElement`
`var`	`HTMLElement`
`video`	`HTMLVideoElement` : `HTMLMediaElement` : `HTMLElement`
`wbr`	`HTMLElement`

Events

List of events
Event	Interface	Description
`abort`	`Event`	Fired at the `Window` when the download was aborted by the user
`afterprint`	`Event`	Fired at the `Window` after printing
`beforeprint`	`Event`	Fired at the `Window` before printing
`beforeunload`	`BeforeUnloadEvent`	Fired at the `Window` when the page is about to be unloaded, in case the page would like to show a warning prompt
`blur`	`Event`	Fired at nodes losing focus
`change`	`Event`	Fired at controls when the user commits a value change
`click`	`Event`	Fired at an element before its activation behavior is run
`contextmenu`	`Event`	Fired at elements when the user requests their context menu
`DOMContentLoaded`	`Event`	Fired at the `Document` once the parser has finished
`error`	`Event`	Fired at elements when network and script errors occur
`focus`	`Event`	Fired at nodes gaining focus
`hashchange`	`HashChangeEvent`	Fired at the `Window` when the fragment identifier part of the document's current address changes
`input`	`Event`	Fired at controls when the user changes the value
`invalid`	`Event`	Fired at controls during form validation if they do not satisfy their constraints
`load`	`Event`	Fired at the `Window` when the document has finished loading; fired at an element containing a resource (e.g. `img`, `embed`) when its resource has finished loading
`message`	`MessageEvent`	Fired at an object when the object receives a message
`offline`	`Event`	Fired at the `Window` when the network connections fails
`online`	`Event`	Fired at the `Window` when the network connections returns
`pagehide`	`PageTransitionEvent`	Fired at the `Window` when the page's entry in the session history stops being the current entry
`pageshow`	`PageTransitionEvent`	Fired at the `Window` when the page's entry in the session history becomes the current entry
`popstate`	`PopStateEvent`	Fired at the `Window` when the user navigates the session history
`readystatechange`	`Event`	Fired at the `Document` when it finishes parsing and again when all its subresources have finished loading
`reset`	`Event`	Fired at a `form` element when it is reset
`show`	`Event`	Fired at a `menu` element when it is shown as a context menu
`submit`	`Event`	Fired at a `form` element when it is submitted
`unload`	`Event`	Fired at the `Window` object when the page is going away

HTML5

A technical specification for Web developers