Living Standard — Last Updated 1 November 2024
The following sections only cover conforming elements and features.
This section is non-normative.
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.
This section is non-normative.
This section is non-normative.
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 | Boolean attribute |
alt
| area ;
img ;
input
| Replacement text for use when images are not available | Text* |
as
| link
| Potential destination for a preload request (for rel ="preload " and rel ="modulepreload ")
| Potential destination, for rel ="preload "; script-like destination, for rel ="modulepreload "
|
async
| script
| Execute script when available, without blocking while fetching | Boolean attribute |
autocapitalize
| HTML elements | Recommended autocapitalization behavior (for supported input methods) | "on ";
"off ";
"none ";
"sentences ";
"words ";
"characters "
|
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* |
autocorrect
| HTML elements | Recommended autocorrection behavior (for supported input methods) | "on ";
"off "
|
autofocus
| HTML elements | Automatically focus the element 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 |
blocking
| link ;
script ;
style
| Whether the element is potentially render-blocking | Unordered set of unique space-separated tokens* |
charset
| meta
| Character encoding declaration | "utf-8 "
|
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 |
color
| link
| Color to use when customizing a site's icon (for rel ="mask-icon ")
| CSS <color> |
colorspace
| input
| The color space of the serialized color | "limited-srgb ";
"display-p3 "
|
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 "; "plaintext-only ";
"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 floating-point numbers* |
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 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 |
decoding
| img
| Decoding hint to use when processing this image for presentation | "sync ";
"async ";
"auto "
|
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 control to use for sending the element's directionality in form submission | Text* |
disabled
| button ;
input ;
optgroup ;
option ;
select ;
textarea ;
form-associated custom elements
| Whether the form control is disabled | Boolean attribute |
disabled
| fieldset
| Whether the descendant form controls, except any inside legend , are disabled
| Boolean attribute |
disabled
| link
| Whether the link 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 "
|
enctype
| form
| Entry list encoding type to use for form submission | "application/x-www-form-urlencoded "; "multipart/form-data "; "text/plain "
|
enterkeyhint
| HTML elements | Hint for selecting an enter key action | "enter ";
"done ";
"go ";
"next ";
"previous ";
"search ";
"send "
|
fetchpriority
| img ;
link ;
script
| Sets the priority for fetches initiated by the element | "auto ";
"high ";
"low "
|
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 consisting of IDs* |
form
| button ;
fieldset ;
input ;
object ;
output ;
select ;
textarea ;
form-associated custom elements
| Associates the element 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
| Entry list encoding type to use for form submission | "application/x-www-form-urlencoded "; "multipart/form-data "; "text/plain "
|
formmethod
| button ;
input
| Variant to use for form submission | "GET ";
"POST ";
"dialog "
|
formnovalidate
| button ;
input
| Bypass form control validation for form submission | Boolean attribute |
formtarget
| button ;
input
| Navigable for form submission | Valid navigable target name or keyword |
headers
| td ;
th
| The header cells for this cell | Unordered set of unique space-separated tokens consisting of IDs* |
height
| canvas ;
embed ;
iframe ;
img ;
input ;
object ;
source (in picture );
video
| Vertical dimension | Valid non-negative integer |
hidden
| Whether the element is relevant | " | "; " "; the empty string|
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 ;
link
| Language of the linked resource | Valid BCP 47 language tag |
http-equiv
| meta
| Pragma directive | "content-type ";
"default-style ";
"refresh ";
"x-ua-compatible ";
"content-security-policy "
|
id
| HTML elements | The element's ID | Text* |
imagesizes
| link
| Image sizes for different page layouts (for rel ="preload ")
| Valid source size list |
imagesrcset
| link
| Images to use in different situations, e.g., high-resolution displays, small monitors, etc. (for rel ="preload ")
| Comma-separated list of image candidate strings |
inert
| HTML elements | Whether the element is inert. | Boolean attribute |
inputmode
| HTML elements | Hint for selecting an input modality | "none ";
"text ";
"tel ";
"email ";
"url ";
"numeric ";
"decimal ";
"search "
|
integrity
| link ;
script
| Integrity metadata used in Subresource Integrity checks [SRI] | Text |
is
| HTML elements | Creates a customized built-in element | Valid custom element name of a defined customized built-in element |
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 consisting of valid absolute URLs, defined property names, or text* |
itemref
| HTML elements | Referenced elements | Unordered set of unique space-separated tokens 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 consisting of valid absolute URLs* |
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* |
loading
| iframe ;
img
| Used when determining loading deferral | "lazy ";
"eager "
|
loop
| audio ;
video
| Whether to loop the media resource | Boolean attribute |
low
| meter
| High limit of low range | Valid floating-point number* |
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 ;
meta ;
source ;
style
| Applicable media | Valid media query list |
method
| form
| Variant to use for form submission | "GET ";
"POST ";
"dialog "
|
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 ;
output ;
select ;
textarea ;
form-associated custom elements
| Name of the element to use for form submission and in the form.elements API
| Text* |
name
| details
| Name of group of mutually-exclusive details elements
| Text* |
name
| form
| Name of form to use in the document.forms API
| Text* |
name
| iframe ;
object
| Name of content navigable | Valid navigable target name or keyword |
name
| map
| Name of image map to reference from the usemap attribute
| Text* |
name
| meta
| Metadata name | Text* |
name
| slot
| Name of shadow tree slot | Text |
nomodule
| script
| Prevents execution in user agents that support module scripts | Boolean attribute |
nonce
| HTML elements | Cryptographic nonce used in Content Security Policy checks [CSP] | Text |
novalidate
| form
| Bypass form control validation for form submission | Boolean attribute |
open
| details
| Whether the details are visible | Boolean attribute |
open
| dialog
| Whether the dialog box is showing | 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* |
playsinline
| video
| Encourage the user agent to display video content within the element's playback area | Boolean attribute |
popover
| HTML elements | Makes the element a popover element | "auto ";
"manual ";
|
popovertarget
| button ;
input
| Targets a popover element to toggle, show, or hide | ID* |
popovertargetaction
| button ;
input
| Indicates whether a targeted popover element is to be toggled, shown, or hidden | "toggle ";
"show ";
"hide "
|
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 |
readonly
| form-associated custom elements | Affects willValidate , plus any behavior added by the custom element author
| Boolean attribute |
referrerpolicy
| a ;
area ;
iframe ;
img ;
link ;
script
| Referrer policy for fetches initiated by the element | Referrer policy |
rel
| a ;
area
| Relationship between the location in the document containing the hyperlink and the destination resource | Unordered set of unique space-separated tokens* |
rel
| link
| Relationship between the document containing the hyperlink and the destination resource | Unordered set of unique 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 |
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 |
shadowrootclonable
| template
| Sets clonable on a declarative shadow root | Boolean attribute |
shadowrootdelegatesfocus
| template
| Sets delegates focus on a declarative shadow root | Boolean attribute |
shadowrootmode
| template
| Enables streaming declarative shadow roots | "open ";
"closed "
|
shadowrootserializable
| template
| Sets serializable on a declarative shadow root | 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* |
sizes
| img ;
source
| Image sizes for different page layouts | Valid source size list |
slot
| HTML elements | The element's desired slot | Text |
span
| col ;
colgroup
| Number of columns spanned by the element | Valid non-negative integer greater than zero |
spellcheck
| HTML elements | Whether the element is to have its spelling and grammar checked | "true ";
"false ";
the empty string
|
src
| audio ;
embed ;
iframe ;
img ;
input ;
script ;
source (in video or audio );
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 |
srcset
| img ;
source
| Images to use in different situations, e.g., high-resolution displays, small monitors, etc. | Comma-separated list of image candidate strings |
start
| ol
| Starting value of the list | 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 sequentially focusable, and the relative order of the element for the purposes of sequential focus navigation | Valid integer |
target
| a ;
area
| Navigable for hyperlink navigation | Valid navigable target name or keyword |
target
| base
| Default navigable for hyperlink navigation and form submission | Valid navigable target name or keyword |
target
| form
| Navigable for form submission | Valid navigable target 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
| CSS style sheet set name | Text |
translate
| HTML elements | Whether the element is to be translated when the page is localized | "yes "; "no "
|
type
| a ;
link
| Hint for the type of the referenced resource | Valid MIME type string |
type
| button
| Type of button | "submit ";
"reset ";
"button "
|
type
| embed ;
object ;
source
| Type of embedded resource | Valid MIME type string |
type
| input
| Type of form control | input type keyword
|
type
| ol
| Kind of list marker | "1 ";
"a ";
"A ";
"i ";
"I "
|
type
| script
| Type of script | "module "; a valid MIME type string that is not a JavaScript MIME type essence match
|
usemap
| img
| 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 |
width
| canvas ;
embed ;
iframe ;
img ;
input ;
object ;
source (in picture );
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 "
|
writingsuggestions
| HTML elements | Whether the element can offer writing suggestions or not. | "true ";
"false ";
the empty string
|
An asterisk (*) in a cell indicates that the actual rules are more complicated than indicated in the table above.
Support in all current engines.
Support in all current engines.
Support in all current engines.
Support in all current engines.
Support in all current engines.
Support in all current engines.
Support in all current engines.
This section is non-normative.
This section is non-normative.
AudioTrack
AudioTrackList
BarProp
BeforeUnloadEvent
BroadcastChannel
CanvasGradient
CanvasPattern
CanvasRenderingContext2D
CloseWatcher
CustomElementRegistry
CustomStateSet
DOMParser
DOMStringList
DOMStringMap
DataTransfer
DataTransferItem
DataTransferItemList
DedicatedWorkerGlobalScope
Document
, partial 1 2DragEvent
Element
, partialElementInternals
ErrorEvent
EventSource
External
FormDataEvent
HTMLAllCollection
HTMLAnchorElement
, partialHTMLAreaElement
, partialHTMLAudioElement
HTMLBRElement
, partialHTMLBaseElement
HTMLBodyElement
, partialHTMLButtonElement
HTMLCanvasElement
HTMLDListElement
, partialHTMLDataElement
HTMLDataListElement
HTMLDetailsElement
HTMLDialogElement
HTMLDirectoryElement
HTMLDivElement
, partialHTMLElement
HTMLEmbedElement
, partialHTMLFieldSetElement
HTMLFontElement
HTMLFormControlsCollection
HTMLFormElement
HTMLFrameElement
HTMLFrameSetElement
HTMLHRElement
, partialHTMLHeadElement
HTMLHeadingElement
, partialHTMLHtmlElement
, partialHTMLIFrameElement
, partialHTMLImageElement
, partialHTMLInputElement
, partialHTMLLIElement
, partialHTMLLabelElement
HTMLLegendElement
, partialHTMLLinkElement
, partialHTMLMapElement
HTMLMarqueeElement
HTMLMediaElement
HTMLMenuElement
, partialHTMLMetaElement
, partialHTMLMeterElement
HTMLModElement
HTMLOListElement
, partialHTMLObjectElement
, partialHTMLOptGroupElement
HTMLOptionElement
HTMLOptionsCollection
HTMLOutputElement
HTMLParagraphElement
, partialHTMLParamElement
HTMLPictureElement
HTMLPreElement
, partialHTMLProgressElement
HTMLQuoteElement
HTMLScriptElement
, partialHTMLSelectElement
HTMLSlotElement
HTMLSourceElement
HTMLSpanElement
HTMLStyleElement
, partialHTMLTableCaptionElement
, partialHTMLTableCellElement
, partialHTMLTableColElement
, partialHTMLTableElement
, partialHTMLTableRowElement
, partialHTMLTableSectionElement
, partialHTMLTemplateElement
HTMLTextAreaElement
HTMLTimeElement
HTMLTitleElement
HTMLTrackElement
HTMLUListElement
, partialHTMLUnknownElement
HTMLVideoElement
HashChangeEvent
History
ImageBitmap
ImageBitmapRenderingContext
ImageData
Location
MediaError
MessageChannel
MessageEvent
MessagePort
MimeType
MimeTypeArray
NavigateEvent
Navigation
NavigationActivation
NavigationCurrentEntryChangeEvent
NavigationDestination
NavigationHistoryEntry
NavigationTransition
Navigator
, partialNotRestoredReasonDetails
NotRestoredReasons
OffscreenCanvas
OffscreenCanvasRenderingContext2D
PageRevealEvent
PageSwapEvent
PageTransitionEvent
Path2D
Plugin
PluginArray
PopStateEvent
PromiseRejectionEvent
RadioNodeList
Range
, partialShadowRoot
, partialSharedWorker
SharedWorkerGlobalScope
Storage
StorageEvent
SubmitEvent
TextMetrics
TextTrack
TextTrackCue
TextTrackCueList
TextTrackList
TimeRanges
ToggleEvent
TrackEvent
UserActivation
ValidityState
VideoTrack
VideoTrackList
VisibilityStateEntry
Window
, partialWorker
WorkerGlobalScope
WorkerLocation
WorkerNavigator
Worklet
WorkletGlobalScope
This section is non-normative.
The following table lists events fired by this document, excluding those already defined in media element events and drag-and-drop events.
Event | Interface | Interesting targets | Description |
---|---|---|---|
DOMContentLoaded
|