HTML

Living Standard — Last Updated ~~29 September~~ 1 October 2025

Index

Index

The following sections only cover conforming elements and features.

Elements

This section is non-normative.

List of elements
Element	Description	Categories	Parents†	Children	Attributes	Interface
`a`	Hyperlink	flow ; phrasing *; interactive ; palpable	phrasing	transparent *	globals ; `href` ; `target` ; `download` ; `ping` ; `rel` ; `hreflang` ; `type` ; `referrerpolicy`	`HTMLAnchorElement`
`abbr`	Abbreviation	flow ; phrasing ; palpable	phrasing	phrasing	globals	`HTMLElement`
`address`	Contact information for a page or `article` element	flow ; palpable	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` ; `referrerpolicy`	`HTMLAreaElement`
`article`	Self-contained syndicatable or reusable composition	flow ; sectioning ; palpable	flow	flow	globals	`HTMLElement`
`aside`	Sidebar for tangentially related content	flow ; sectioning ; palpable	flow	flow	globals	`HTMLElement`
`audio`	Audio player	flow ; phrasing ; embedded ; interactive ; palpable *	phrasing	`source` ; `track` ; transparent *	globals ; `src` ; `crossorigin` ; `preload` ; `autoplay` ; `loop` ; `muted` ; `controls`	`HTMLAudioElement`
`b`	Keywords	flow ; phrasing ; palpable	phrasing	phrasing	globals	`HTMLElement`
`base`	Base URL and default target navigable for hyperlinks and forms	metadata	`head`	empty	globals ; `href` ; `target`	`HTMLBaseElement`
`bdi`	Text directionality isolation	flow ; phrasing ; palpable	phrasing	phrasing	globals	`HTMLElement`
`bdo`	Text directionality formatting	flow ; phrasing ; palpable	phrasing	phrasing	globals	`HTMLElement`
`blockquote`	A section quoted from another source	flow ; palpable	flow	flow	globals ; `cite`	`HTMLQuoteElement`
`body`	Document body	none	`html`	flow	globals ; `onafterprint` ; `onbeforeprint` ; `onbeforeunload` ; `onhashchange` ; `onlanguagechange` ; `onmessage` ; `onmessageerror` ; `onoffline` ; `ononline` ; `onpageswap` ; `onpagehide` ; `onpagereveal` ; `onpageshow` ; `onpopstate` ; `onrejectionhandled` ; `onstorage` ; `onunhandledrejection` ; `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 ; palpable	phrasing	phrasing *	globals ; `command` ; `commandfor` ; `disabled` ; `form` ; `formaction` ; `formenctype` ; `formmethod` ; `formnovalidate` ; `formtarget` ; `name` ; `popovertarget` ; `popovertargetaction` ; `type` ; `value`	`HTMLButtonElement`
`canvas`	Scriptable bitmap canvas	flow ; phrasing ; embedded ; palpable	phrasing	transparent	globals ; `width` ; `height`	`HTMLCanvasElement`
`caption`	Table caption	none	`table`	flow *	globals	`HTMLTableCaptionElement`
`cite`	Title of a work	flow ; phrasing ; palpable	phrasing	phrasing	globals	`HTMLElement`
`code`	Computer code	flow ; phrasing ; palpable	phrasing	phrasing	globals	`HTMLElement`
`col`	Table column	none	`colgroup`	empty	globals ; `span`	`HTMLTableColElement`
`colgroup`	Group of columns in a table	none	`table`	`col` ; `template`	globals ; `span`	`HTMLTableColElement`
`data`	Machine-readable equivalent	flow ; phrasing ; palpable	phrasing	phrasing	globals ; `value`	`HTMLDataElement`
`datalist`	Container for options for combo box control	flow ; phrasing	phrasing	phrasing ; `option` ; script-supporting elements *	globals	`HTMLDataListElement`
`dd`	Content for corresponding `dt` element(s)	none	`dl` ; `div` *	flow	globals	`HTMLElement`
`del`	A removal from the document	flow ; phrasing *; palpable	phrasing	transparent	globals ; `cite` ; `datetime`	`HTMLModElement`
`details`	Disclosure control for hiding details	flow ; interactive ; palpable	flow	`summary` *; flow	globals ; `name` ; `open`	`HTMLDetailsElement`
`dfn`	Defining instance	flow ; phrasing ; palpable	phrasing	phrasing *	globals	`HTMLElement`
`dialog`	Dialog box or window	flow	flow	flow	globals ; `open`	`HTMLDialogElement`
`div`	Generic flow container, or container for name-value groups in `dl` elements	flow ; palpable ; `select` element inner content elements ; `optgroup` element inner content elements ; `option` element inner content elements	flow ; `dl` ; `select` element inner content elements ; `optgroup` element inner content elements ; `option` element inner content elements	flow `select` element inner content elements ; `optgroup` element inner content elements ; `option` element inner content elements *	globals	`HTMLDivElement`
`dl`	Association list consisting of zero or more name-value groups	flow ; palpable	flow	`dt` ; `dd` ; `div` *; script-supporting elements	globals	`HTMLDListElement`
`dt`	Legend for corresponding `dd` element(s)	none	`dl` ; `div` *	flow *	globals	`HTMLElement`
`em`	Stress emphasis	flow ; phrasing ; palpable	phrasing	phrasing	globals	`HTMLElement`
`embed`	Plugin	flow ; phrasing ; embedded ; interactive ; palpable	phrasing	empty	globals ; `src` ; `type` ; `width` ; `height` ; any*	`HTMLEmbedElement`
`fieldset`	Group of form controls	flow ; listed ; form-associated ; palpable	flow	`legend` *; flow	globals ; `disabled` ; `form` ; `name`	`HTMLFieldSetElement`
`figcaption`	Caption for `figure`	none	`figure`	flow	globals	`HTMLElement`
`figure`	Figure with optional caption	flow ; palpable	flow	`figcaption` *; flow	globals	`HTMLElement`
`footer`	Footer for a page or section	flow ; palpable	flow	flow *	globals	`HTMLElement`
`form`	User-submittable form	flow ; palpable	flow	flow *	globals ; `accept-charset` ; `action` ; `autocomplete` ; `enctype` ; `method` ; `name` ; `novalidate` ; `rel` ; `target`	`HTMLFormElement`
`h1`, `h2`, `h3`, `h4`, `h5`, `h6`	Heading	flow ; heading ; palpable	`legend` ; `summary` ; 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 ; palpable	flow	flow *	globals	`HTMLElement`
`hgroup`	Heading container	flow ; palpable	`legend` ; `summary` ; flow	`h1` ; `h2` ; `h3` ; `h4` ; `h5` ; `h6` ; `p` ; script-supporting elements	globals	`HTMLElement`
`hr`	Thematic break	flow ; `select` element inner content elements	flow ; `select` element inner content elements	empty	globals	`HTMLHRElement`
`html`	Root element	none	none*	`head` ; `body`	globals	`HTMLHtmlElement`
`i`	Alternate voice	flow ; phrasing ; palpable	phrasing	phrasing	globals	`HTMLElement`
`iframe`	Child navigable	flow ; phrasing ; embedded ; interactive ; palpable	phrasing	empty	globals ; `src` ; `srcdoc` ; `name` ; `sandbox` ; `allow` ; `allowfullscreen` ; `width` ; `height` ; `referrerpolicy` ; `loading`	`HTMLIFrameElement`
`img`	Image	flow ; phrasing ; embedded ; interactive *; form-associated ; palpable	phrasing ; `picture`	empty	globals ; `alt` ; `src` ; `srcset` ; `sizes` ; `crossorigin` ; `usemap` ; `ismap` ; `width` ; `height` ; `referrerpolicy` ; `decoding` ; `loading` ; `fetchpriority`	`HTMLImageElement`
`input`	Form control	flow ; phrasing ; interactive ; listed ; labelable ; submittable ; resettable ; form-associated ; palpable	phrasing	empty	globals ; `accept` ; `alpha` ; `alt` ; `autocomplete` ; `checked` ; `colorspace` ; `dirname` ; `disabled` ; `form` ; `formaction` ; `formenctype` ; `formmethod` ; `formnovalidate` ; `formtarget` ; `height` ; `list` ; `max` ; `maxlength` ; `min` ; `minlength` ; `multiple` ; `name` ; `pattern` ; `placeholder` ; `popovertarget` ; `popovertargetaction` ; `readonly` ; `required` ; `size` ; `src` ; `step` ; `type` ; `value` ; `width`	`HTMLInputElement`
`ins`	An addition to the document	flow ; phrasing *; palpable	phrasing	transparent	globals ; `cite` ; `datetime`	`HTMLModElement`
`kbd`	User input	flow ; phrasing ; palpable	phrasing	phrasing	globals	`HTMLElement`
`label`	Caption for a form control	flow ; phrasing ; interactive ; palpable	phrasing	phrasing *	globals ; `for`	`HTMLLabelElement`
`legend`	Caption for `fieldset`	none	`fieldset` ; `optgroup`	phrasing *; heading content	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` ; `crossorigin` ; `rel` ; `as` ; `media` ; `hreflang` ; `type` ; `sizes` ; `imagesrcset` ; `imagesizes` ; `referrerpolicy` ; `integrity` ; `blocking` ; `color` ; `disabled` ; `fetchpriority`	`HTMLLinkElement`
`main`	Container for the dominant contents of the document	flow ; palpable	flow *	flow	globals	`HTMLElement`
`map`	Image map	flow ; phrasing *; palpable	phrasing	transparent ; `area` *	globals ; `name`	`HTMLMapElement`
`mark`	Highlight	flow ; phrasing ; palpable	phrasing	phrasing	globals	`HTMLElement`
MathML `math`	MathML root	flow ; phrasing ; embedded ; palpable	phrasing	per [MATHML]	per [MATHML]	`Element`
`menu`	Menu of commands	flow ; palpable *	flow	`li` ; script-supporting elements	globals	`HTMLMenuElement`
`meta`	Text metadata	metadata ; flow ; phrasing	`head` ; `noscript` ; phrasing	empty	globals ; `name` ; `http-equiv` ; `content` ; `charset` ; `media`	`HTMLMetaElement`
`meter`	Gauge	flow ; phrasing ; labelable ; palpable	phrasing	phrasing *	globals ; `value` ; `min` ; `max` ; `low` ; `high` ; `optimum`	`HTMLMeterElement`
`nav`	Section with navigational links	flow ; sectioning ; palpable	flow	flow	globals	`HTMLElement`
`noscript`	Fallback content for script	metadata ; flow ; phrasing ; `select` element inner content elements ; `optgroup` element inner content elements	`head` ; phrasing	varies*	globals	`HTMLElement`
`object`	Image, child navigable , or plugin	flow ; phrasing ; embedded ; interactive *; listed ; form-associated ; palpable	phrasing	transparent	globals ; `data` ; `type` ; `name` ; `form` ; `width` ; `height`	`HTMLObjectElement`
`ol`	Ordered list	flow ; palpable *	flow	`li` ; script-supporting elements	globals ; `reversed` ; `start` ; `type`	`HTMLOListElement`
`optgroup`	Group of options in a list box	`select` element inner content elements	`select` ; `div` *	`optgroup element inner content elements` ; `legend` *	globals ; `disabled` ; `label`	`HTMLOptGroupElement`
`option`	Option in a list box or combo box control	`select` element inner content elements ; `optgroup` element inner content elements	`select` ; `datalist` ; `optgroup` ; `div` *	text ; `option` element inner content elements	globals ; `disabled` ; `label` ; `selected` ; `value`	`HTMLOptionElement`
`output`	Calculated output value	flow ; phrasing ; listed ; labelable ; resettable ; form-associated ; palpable	phrasing	phrasing	globals ; `for` ; `form` ; `name`	`HTMLOutputElement`
`p`	Paragraph	flow ; palpable	flow	phrasing	globals	`HTMLParagraphElement`
`picture`	Image	flow ; phrasing ; embedded ; palpable	phrasing	`source` *; one `img` ; script-supporting elements	globals	`HTMLPictureElement`
`pre`	Block of preformatted text	flow ; palpable	flow	phrasing	globals	`HTMLPreElement`
`progress`	Progress bar	flow ; phrasing ; labelable ; palpable	phrasing	phrasing *	globals ; `value` ; `max`	`HTMLProgressElement`
`q`	Quotation	flow ; phrasing ; palpable	phrasing	phrasing	globals ; `cite`	`HTMLQuoteElement`
`rp`	Parenthesis for ruby annotation text	none	`ruby`	text	globals	`HTMLElement`
`rt`	Ruby annotation text	none	`ruby`	phrasing	globals	`HTMLElement`
`ruby`	Ruby annotation(s)	flow ; phrasing ; palpable	phrasing	phrasing ; `rt` ; `rp` *	globals	`HTMLElement`
`s`	Inaccurate text	flow ; phrasing ; palpable	phrasing	phrasing	globals	`HTMLElement`
`samp`	Computer output	flow ; phrasing ; palpable	phrasing	phrasing	globals	`HTMLElement`
`script`	Embedded script	metadata ; flow ; phrasing ; script-supporting	`head` ; phrasing ; script-supporting	script, data, or script documentation*	globals ; `src` ; `type` ; `nomodule` ; `async` ; `defer` ; `crossorigin` ; `integrity` ; `referrerpolicy` ; `blocking` ; `fetchpriority`	`HTMLScriptElement`
`search`	Container for search controls	flow ; palpable	flow	flow	globals	`HTMLElement`
`section`	Generic document or application section	flow ; sectioning ; palpable	flow	flow	globals	`HTMLElement`
`select`	List box control	flow ; phrasing ; interactive ; listed ; labelable ; submittable ; resettable ; form-associated ; palpable	phrasing	`select` element inner content elements ; `button` *	globals ; `autocomplete` ; `disabled` ; `form` ; `multiple` ; `name` ; `required` ; `size`	`HTMLSelectElement`
`selectedcontent`	Mirrors content from an `option`	none	`button`	empty	globals	`HTMLSelectedContentElement`
`slot`	Shadow tree slot	flow ; phrasing	phrasing	transparent	globals ; `name`	`HTMLSlotElement`
`small`	Side comment	flow ; phrasing ; palpable	phrasing	phrasing	globals	`HTMLElement`
`source`	Image source for `img` or media source for `video` or `audio`	none	`picture` ; `video` ; `audio`	empty	globals ; `type` ; `media` ; `src` ; `srcset` ; `sizes` ; `width` ; `height`	`HTMLSourceElement`
`span`	Generic phrasing container	flow ; phrasing ; palpable	phrasing ; `option` element inner content elements *	phrasing	globals	`HTMLSpanElement`
`strong`	Importance	flow ; phrasing ; palpable	phrasing	phrasing	globals	`HTMLElement`
`style`	Embedded styling information	metadata	`head` ; `noscript` *	text*	globals ; `media` ; `blocking`	`HTMLStyleElement`
`sub`	Subscript	flow ; phrasing ; palpable	phrasing	phrasing	globals	`HTMLElement`
`summary`	Caption for `details`	none	`details`	phrasing ; heading content	globals	`HTMLElement`
`sup`	Superscript	flow ; phrasing ; palpable	phrasing	phrasing	globals	`HTMLElement`
SVG `svg`	SVG root	flow ; phrasing ; embedded ; palpable	phrasing	per [SVG]	per [SVG]	`SVGSVGElement`
`table`	Table	flow ; palpable	flow	`caption` ; `colgroup` ; `thead` ; `tbody` ; `tfoot` ; `tr` ; script-supporting elements	globals	`HTMLTableElement`
`tbody`	Group of rows in a table	none	`table`	`tr` ; script-supporting elements	globals	`HTMLTableSectionElement`
`td`	Table cell	none	`tr`	flow	globals ; `colspan` ; `rowspan` ; `headers`	`HTMLTableCellElement`
`template`	Template	metadata ; flow ; phrasing ; script-supporting	metadata ; phrasing ; script-supporting ; `colgroup` *	empty	globals ; `shadowrootmode` ; `shadowrootdelegatesfocus` ; `shadowrootclonable` ; `shadowrootserializable` ; `shadowrootcustomelementregistry`	`HTMLTemplateElement`
`textarea`	Multiline text controls	flow ; phrasing ; interactive ; listed ; labelable ; submittable ; resettable ; form-associated ; palpable	phrasing	text	globals ; `autocomplete` ; `cols` ; `dirname` ; `disabled` ; `form` ; `maxlength` ; `minlength` ; `name` ; `placeholder` ; `readonly` ; `required` ; `rows` ; `wrap`	`HTMLTextAreaElement`
`tfoot`	Group of footer rows in a table	none	`table`	`tr` ; script-supporting elements	globals	`HTMLTableSectionElement`
`th`	Table header cell	interactive *	`tr`	flow *	globals ; `colspan` ; `rowspan` ; `headers` ; `scope` ; `abbr`	`HTMLTableCellElement`
`thead`	Group of heading rows in a table	none	`table`	`tr` ; script-supporting elements	globals	`HTMLTableSectionElement`
`time`	Machine-readable equivalent of date- or time-related data	flow ; phrasing ; palpable	phrasing	phrasing	globals ; `datetime`	`HTMLTimeElement`
`title`	Document title	metadata	`head`	text *	globals	`HTMLTitleElement`
`tr`	Table row	none	`table` ; `thead` ; `tbody` ; `tfoot`	`th` *; `td` ; script-supporting elements	globals	`HTMLTableRowElement`
`track`	Timed text track	none	`audio` ; `video`	empty	globals ; `default` ; `kind` ; `label` ; `src` ; `srclang`	`HTMLTrackElement`
`u`	Unarticulated annotation	flow ; phrasing ; palpable	phrasing	phrasing	globals	`HTMLElement`
`ul`	List	flow ; palpable *	flow	`li` ; script-supporting elements	globals	`HTMLUListElement`
`var`	Variable	flow ; phrasing ; palpable	phrasing	phrasing	globals	`HTMLElement`
`video`	Video player	flow ; phrasing ; embedded ; interactive ; palpable	phrasing	`source` ; `track` ; transparent *	globals ; `src` ; `crossorigin` ; `poster` ; `preload` ; `autoplay` ; `playsinline` ; `loop` ; `muted` ; `controls` ; `width` ; `height`	`HTMLVideoElement`
`wbr`	Line breaking opportunity	flow ; phrasing	phrasing	empty	globals	`HTMLElement`
autonomous custom elements	Author-defined elements	flow ; phrasing ; palpable	flow ; phrasing	transparent	globals ; any, as decided by the element's author	Supplied by the element's author (inherits from `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 th element could be a parent to an a element.

Element content categories

This section is non-normative.

List of element content categories
Category	Elements	Elements with exceptions
Metadata content	`base` ; `link` ; `meta` ; `noscript` ; `script` ; `style` ; `template` ; `title`	—
Flow content	`a` ; `abbr` ; `address` ; `article` ; `aside` ; `audio` ; `b` ; `bdi` ; `bdo` ; `blockquote` ; `br` ; `button` ; `canvas` ; `cite` ; `code` ; `data` ; `datalist` ; `del` ; `details` ; `dfn` ; `dialog` ; `div` ; `dl` ; `em` ; `embed` ; `fieldset` ; `figure` ; `footer` ; `form` ; `h1` ; `h2` ; `h3` ; `h4` ; `h5` ; `h6` ; `header` ; `hgroup` ; `hr` ; `i` ; `iframe` ; `img` ; `input` ; `ins` ; `kbd` ; `label` ; `map` ; `mark` ; MathML `math` ; `menu` ; `meter` ; `nav` ; `noscript` ; `object` ; `ol` ; `output` ; `p` ; `picture` ; `pre` ; `progress` ; `q` ; `ruby` ; `s` ; `samp` ; `script` ; `search` ; `section` ; `select` ; `slot` ; `small` ; `span` ; `strong` ; `sub` ; `sup` ; SVG `svg` ; `table` ; `template` ; `textarea` ; `time` ; `u` ; `ul` ; `var` ; `video` ; `wbr` ; autonomous custom elements ; Text	`area` (if it is a descendant of a `map` element); `link` (if it is allowed in the body ); `main` (if it is a hierarchically correct `main` element ); `meta` (if the `itemprop` attribute is present)
Sectioning content	`article` ; `aside` ; `nav` ; `section`	—
Heading content	`h1` ; `h2` ; `h3` ; `h4` ; `h5` ; `h6` ; `hgroup`	—
Phrasing content	`a` ; `abbr` ; `audio` ; `b` ; `bdi` ; `bdo` ; `br` ; `button` ; `canvas` ; `cite` ; `code` ; `data` ; `datalist` ; `del` ; `dfn` ; `em` ; `embed` ; `i` ; `iframe` ; `img` ; `input` ; `ins` ; `kbd` ; `label` ; `map` ; `mark` ; MathML `math` ; `meter` ; `noscript` ; `object` ; `output` ; `picture` ; `progress` ; `q` ; `ruby` ; `s` ; `samp` ; `script` ; `select` ; `selectedcontent` ; `slot` ; `small` ; `span` ; `strong` ; `sub` ; `sup` ; SVG `svg` ; `template` ; `textarea` ; `time` ; `u` ; `var` ; `video` ; `wbr` ; autonomous custom elements ; Text	`area` (if it is a descendant of a `map` element); `link` (if it is allowed in the body ); `meta` (if the `itemprop` attribute is present)
Embedded content	`audio` ; `canvas` ; `embed` ; `iframe` ; `img` ; MathML `math` ; `object` ; `picture` ; SVG `svg` ; `video`	—
Interactive content	`button` ; `details` ; `embed` ; `iframe` ; `label` ; `select` ; `textarea`	`a` (if the `href` attribute is present); `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); `video` (if the `controls` attribute is present)
Form-associated elements	`button` ; `fieldset` ; `input` ; `label` ; `object` ; `output` ; `select` ; `textarea` ; `img` ; form-associated custom elements	—
Listed elements	`button` ; `fieldset` ; `input` ; `object` ; `output` ; `select` ; `textarea` ; form-associated custom elements	—
Submittable elements	`button` ; `input` ; `select` ; `textarea` ; form-associated custom elements	—
Resettable elements	`input` ; `output` ; `select` ; `textarea` ; form-associated custom elements	—
Autocapitalize-and-autocorrect inheriting elements	`button` ; `fieldset` ; `input` ; `output` ; `select` ; `textarea`	—
Labelable elements	`button` ; `input` ; `meter` ; `output` ; `progress` ; `select` ; `textarea` ; form-associated custom elements	—
Palpable content	`a` ; `abbr` ; `address` ; `article` ; `aside` ; `b` ; `bdi` ; `bdo` ; `blockquote` ; `button` ; `canvas` ; `cite` ; `code` ; `data` ; `del` ; `details` ; `dfn` ; `div` ; `em` ; `embed` ; `fieldset` ; `figure` ; `footer` ; `form` ; `h1` ; `h2` ; `h3` ; `h4` ; `h5` ; `h6` ; `header` ; `hgroup` ; `i` ; `iframe` ; `img` ; `ins` ; `kbd` ; `label` ; `main` ; `map` ; `mark` ; MathML `math` ; `meter` ; `nav` ; `object` ; `output` ; `p` ; `picture` ; `pre` ; `progress` ; `q` ; `ruby` ; `s` ; `samp` ; `search` ; `section` ; `select` ; `small` ; `span` ; `strong` ; `sub` ; `sup` ; SVG `svg` ; `table` ; `textarea` ; `time` ; `u` ; `var` ; `video` ; autonomous custom elements	`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 element's children include at least one `li` element); `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
Script-supporting elements	`script` ; `template`	—
`select` element inner content elements	`option` ; `optgroup` ; `hr` ; script-supporting elements ; `noscript` ; `div`	—
`optgroup` element inner content elements	`option` ; script-supporting elements ; `noscript` ; `div`	—
`option` element inner content elements	`div`	phrasing content except for `datalist`, `object`, interactive content , or elements with `tabindex`

Attributes

This section is non-normative.

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 type strings with no parameters or `audio/`, `video/`, or `image/*`
`accept-charset`	`form`	Character encodings to use for form submission	ASCII case-insensitive match for " `UTF-8` "
`accesskey`	HTML elements	Keyboard shortcut to activate or focus element	Ordered set of unique space-separated tokens , none of which are identical to another, each consisting of one code point in length
`action`	`form`	URL to use for form submission	Valid non-empty URL potentially surrounded by spaces
`allow`	`iframe`	Permissions policy to be applied to the `iframe` 's contents	Serialized permissions policy
`allowfullscreen`	`iframe`	Whether to allow the `iframe` 's contents to use `requestFullscreen()`	Boolean attribute
`alpha`	`input`	Allow the color's alpha component to be set