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HTML
Living Standard — Last Updated 8 January 2026
Index
The following sections only cover conforming elements and features.
Elements
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.
Element content categories
This section is non-normative.
Attributes
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“;
the empty string
|
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 |
closedby
| dialog
| Which user actions will close the dialog | “any“;
“closerequest“;
“none“;
|
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 |
command
| button
| Indicates to the targeted element which action to take. | “toggle-popover“;
“show-popover“;
“hide-popover“;
“close“;
“request-close“;
“show-modal“;
a custom command keyword
|
commandfor
| button
| Targets another element to be invoked. | ID* |
content
| meta
| Value of the element | Text* |
contenteditable
| HTML elements | Whether the element is editable | “true“;
“false“;
“plaintext-only“;
the empty string
|
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“;
the empty string
|
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* |
headingoffset
| HTML elements | Offsets heading levels for descendants | Valid non-negative integer between 0 and 8 |
headingreset
| HTML elements | Prevents a heading offset computation from traversing beyond the element with the attribute | Boolean attribute |
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“;
“hint“;
the empty string
|
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“;
the empty string
|
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 |
shadowrootcustomelementregistry
| template
| Enables declarative shadow roots to indicate they will use a custom element registry | 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“; the empty string
|
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“; “importmap“; “speculationrules“; 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.
Firefox9+Safari3.1+Chrome1+
Opera12+Edge79+
Edge (Legacy)12+Internet Explorer9+
Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android12+
Opera12+Edge79+
Edge (Legacy)12+Internet Explorer9+
Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android12+
Support in all current engines.
Firefox9+Safari3.1+Chrome1+
Opera12+Edge79+
Edge (Legacy)12+Internet Explorer9+
Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android12+
Opera12+Edge79+
Edge (Legacy)12+Internet Explorer9+
Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android12+
Support in all current engines.
Firefox9+Safari3.1+Chrome1+
Opera12+Edge79+
Edge (Legacy)12+Internet Explorer9+
Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android12+
Opera12+Edge79+
Edge (Legacy)12+Internet Explorer9+
Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android12+
Support in all current engines.
Firefox9+Safari3.1+Chrome1+
Opera12+Edge79+
Edge (Legacy)12+Internet Explorer9+
Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android12+
Opera12+Edge79+
Edge (Legacy)12+Internet Explorer9+
Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android12+
Support in all current engines.
Firefox9+Safari3.1+Chrome1+
Opera12+Edge79+
Edge (Legacy)12+Internet Explorer9+
Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android12+
Opera12+Edge79+
Edge (Legacy)12+Internet Explorer9+
Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android12+
Support in all current engines.
Firefox9+Safari3.1+Chrome1+
Opera12+Edge79+
Edge (Legacy)12+Internet Explorer9+
Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android12+
Opera12+Edge79+
Edge (Legacy)12+Internet Explorer9+
Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android12+
Support in all current engines.
Firefox9+Safari3.1+Chrome1+
Opera12+Edge79+
Edge (Legacy)12+Internet Explorer9+
Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android12+
Opera12+Edge79+
Edge (Legacy)12+Internet Explorer9+
Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android12+
Element interfaces
This section is non-normative.
All interfaces
This section is non-normative.
AudioTrackAudioTrackListBarPropBeforeUnloadEventBroadcastChannelCanvasGradientCanvasPatternCanvasRenderingContext2DCloseWatcherCommandEventCustomElementRegistryCustomStateSetDOMParserDOMStringListDOMStringMapDataTransferDataTransferItemDataTransferItemListDedicatedWorkerGlobalScopeDocument, partial 1 2DragEventElement, partialElementInternalsErrorEventEventSourceExternalFormDataEventHTMLAllCollectionHTMLAnchorElement, partialHTMLAreaElement, partialHTMLAudioElementHTMLBRElement, partialHTMLBaseElementHTMLBodyElement, partialHTMLButtonElementHTMLCanvasElementHTMLDListElement, partialHTMLDataElementHTMLDataListElementHTMLDetailsElementHTMLDialogElementHTMLDirectoryElementHTMLDivElement, partialHTMLElementHTMLEmbedElement, partialHTMLFieldSetElementHTMLFontElementHTMLFormControlsCollectionHTMLFormElementHTMLFrameElementHTMLFrameSetElementHTMLHRElement, partialHTMLHeadElementHTMLHeadingElement, partialHTMLHtmlElement, partialHTMLIFrameElement, partialHTMLImageElement, partialHTMLInputElement, partialHTMLLIElement, partialHTMLLabelElementHTMLLegendElement, partialHTMLLinkElement, partialHTMLMapElementHTMLMarqueeElementHTMLMediaElementHTMLMenuElement, partialHTMLMetaElement, partialHTMLMeterElementHTMLModElementHTMLOListElement, partialHTMLObjectElement, partialHTMLOptGroupElementHTMLOptionElementHTMLOptionsCollectionHTMLOutputElementHTMLParagraphElement, partialHTMLParamElementHTMLPictureElementHTMLPreElement, partialHTMLProgressElementHTMLQuoteElementHTMLScriptElement, partialHTMLSelectElementHTMLSelectedContentElementHTMLSlotElementHTMLSourceElementHTMLSpanElementHTMLStyleElement, partialHTMLTableCaptionElement, partialHTMLTableCellElement, partialHTMLTableColElement, partialHTMLTableElement, partialHTMLTableRowElement, partialHTMLTableSectionElement, partialHTMLTemplateElementHTMLTextAreaElementHTMLTimeElementHTMLTitleElementHTMLTrackElementHTMLUListElement, partialHTMLUnknownElementHTMLVideoElementHashChangeEventHistoryImageBitmapImageBitmapRenderingContextImageDataLocationMediaErrorMessageChannelMessageEventMessagePortMimeTypeMimeTypeArrayNavigateEventNavigationNavigationActivationNavigationCurrentEntryChangeEventNavigationDestinationNavigationHistoryEntryNavigationPrecommitControllerNavigationTransitionNavigator, partialNotRestoredReasonDetailsNotRestoredReasonsOffscreenCanvasOffscreenCanvasRenderingContext2DOriginPageRevealEventPageSwapEventPageTransitionEventPath2DPluginPluginArrayPopStateEventPromiseRejectionEventRadioNodeListRange, partialShadowRoot, partialSharedWorkerSharedWorkerGlobalScopeStorageStorageEventSubmitEventTextMetricsTextTrackTextTrackCueTextTrackCueListTextTrackListTimeRangesToggleEventTrackEventUserActivationValidityStateVideoTrackVideoTrackListVisibilityStateEntryWindow, partialWorkerWorkerGlobalScopeWorkerLocationWorkerNavigatorWorkletWorkletGlobalScopeXMLSerializer
Events
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
Support in all current engines. Firefox1+Safari3.1+Chrome1+ Opera9+Edge79+ Edge (Legacy)12+Internet Explorer9+ Firefox Android?Safari iOS?Chrome Android?WebView Android37+Samsung Internet?Opera Android10.1+ | Event
| Document
| Fired at the Document once the parser has finished
|
afterprint
Support in all current engines. Firefox6+Safari13+Chrome63+ Opera?Edge79+ Edge (Legacy)12+Internet Explorer9+ Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android? | Event
| Window
| Fired at the Window after printing
|
beforeprint
Support in all current engines. Firefox6+Safari13+Chrome63+ Opera?Edge79+ Edge (Legacy)12+Internet Explorer9+ Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android? | Event
| Window
| Fired at the Window before printing
|
beforematch
Support in one engine only. FirefoxNoSafariNoChrome102+ OperaNoEdge102+ Edge (Legacy)?Internet ExplorerNo Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android? | Event
| Elements | Fired on elements with the attribute before they are revealed. |
beforetoggle
HTMLElement/beforetoggle_event Support in all current engines. Firefox🔰 114+Safaripreview+Chrome114+ Opera?Edge114+ Edge (Legacy)?Internet ExplorerNo Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android? | ToggleEvent
| Elements | Fired on elements with the popover attribute when they
are transitioning between showing and hidden
|
beforeunload
Support in all current engines. Firefox1+Safari3+Chrome1+ Opera12+Edge79+ Edge (Legacy)12+Internet Explorer4+ Firefox Android?Safari iOS1+Chrome Android?WebView Android?Samsung Internet?Opera Android12+ | BeforeUnloadEvent
| Window
| 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
| Window, elements
| Fired at nodes when they stop being focused |
cancel
HTMLDialogElement/cancel_event Support in all current engines. Firefox98+Safari15.4+Chrome37+ Opera?Edge79+ Edge (Legacy)?Internet ExplorerNo Firefox Android?Safari iOS?Chrome AndroidNoWebView Android?Samsung Internet?Opera Android? | Event
| CloseWatcher, dialog elements, input elements
| Fired at CloseWatcher objects or dialog elements when they receive a close request, or at input elements whose type attribute is in the File state when the user does not change their selection
|
change
Support in all current engines. Firefox1+Safari3+Chrome1+ Opera9+Edge79+ Edge (Legacy)12+Internet Explorer9+ Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android10.1+ | Event
| Form controls | Fired at controls when the user commits a value change (see also the input event)
|
click
| PointerEvent
| Elements | Normally a mouse event; also synthetically fired at an element before its activation behavior is run, when an element is activated from a non-pointer input device (e.g. a keyboard) |
close
Support in all current engines. Firefox98+Safari15.4+Chrome37+ Opera?Edge79+ Edge (Legacy)?Internet ExplorerNo Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android? | Event
| CloseWatcher, dialog elements, MessagePort
| Fired at CloseWatcher objects or dialog elements when they are closed via a close request or via web developer code, or at MessagePort objects when disentangled
|
command
| CommandEvent
| Elements | Fired at elements when they handle a user invocation, via a commandfor attribute.
|
connect
SharedWorkerGlobalScope/connect_event Support in all current engines. Firefox29+Safari16+Chrome4+ Opera10.6+Edge79+ Edge (Legacy)?Internet ExplorerNo Firefox Android?Safari iOS16+Chrome Android?WebView Android37+Samsung Internet?Opera Android11+ | MessageEvent
| SharedWorkerGlobalScope
| Fired at a shared worker's global scope when a new client connects |
contextlost
HTMLCanvasElement/webglcontextlost_event Support in one engine only. FirefoxNoSafariNoChrome98+ Opera?Edge98+ Edge (Legacy)?Internet ExplorerNo Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android? | Event
| canvas elements, OffscreenCanvas objects
| Fired when the corresponding CanvasRenderingContext2D or OffscreenCanvasRenderingContext2D is lost
|
contextrestored
HTMLCanvasElement/contextrestored_event Support in one engine only. FirefoxNoSafariNoChrome98+ Opera?Edge98+ Edge (Legacy)?Internet ExplorerNo Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android? | Event
| canvas elements, OffscreenCanvas objects
| Fired when the corresponding CanvasRenderingContext2D or OffscreenCanvasRenderingContext2D is restored after being lost
|
currententrychange
| NavigationCurrentEntryChangeEvent
| Navigation
| Fired when navigation.currentEntry changes
|
dispose
| Event
| NavigationHistoryEntry
| Fired when the session history entry corresponding to the NavigationHistoryEntry has been permanently evicted from session history and can no longer be traversed to
|
error
Support in all current engines. Firefox6+Safari5+Chrome6+ Opera12+Edge79+ Edge (Legacy)?Internet ExplorerNo Firefox Android45+Safari iOS5+Chrome Android?WebView Android?Samsung Internet?Opera Android12+ Support in all current engines. Firefox6+Safari5.1+Chrome10+ Opera?Edge79+ Edge (Legacy)12+Internet Explorer9+ Firefox Android?Safari iOS?Chrome Android?WebView Android37+Samsung Internet?Opera Android? | Event or ErrorEvent
| Global scope objects, Worker objects, elements, networking-related objects
| Fired when unexpected errors occur (e.g. networking errors, script errors, decoding errors) |
focus
| Event
| Window, elements
| Fired at nodes gaining focus |
formdata
HTMLFormElement/formdata_event Support in all current engines. Firefox72+Safari15+Chrome77+ Opera?Edge79+ Edge (Legacy)?Internet ExplorerNo Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android? | FormDataEvent
| form elements
| Fired at a form element when it is constructing the entry list
|
hashchange
Support in all current engines. Firefox3.6+Safari5+Chrome8+ Opera10.6+Edge79+ Edge (Legacy)12+Internet Explorer8+ Firefox Android?Safari iOS5+Chrome Android?WebView Android37+Samsung Internet?Opera Android11+ | HashChangeEvent
| Window
| Fired at the Window when the fragment part of the document's URL changes
|
input
| Event
| Elements | Fired when the user changes the contenteditable element's content, or the form control's value. See also the change event for form controls.
|
invalid
HTMLInputElement/invalid_event Support in all current engines. Firefox4+Safari5+Chrome10+ Opera10+Edge79+ Edge (Legacy)12+Internet Explorer10+ Firefox Android64+Safari iOS5+Chrome Android?WebView Android4+Samsung Internet4.0+Opera Android12+ | Event
| Form controls | Fired at controls during form validation if they do not satisfy their constraints |
languagechange
Support in all current engines. Firefox32+Safari10.1+Chrome37+ Opera?Edge79+ Edge (Legacy)?Internet ExplorerNo Firefox Android4+Safari iOS?Chrome Android?WebView Android?Samsung Internet4.0+Opera Android? WorkerGlobalScope/languagechange_event Support in all current engines. Firefox74+Safari4+Chrome4+ Opera11.5+Edge79+ Edge (Legacy)?Internet ExplorerNo Firefox Android?Safari iOS5+Chrome Android?WebView Android37+Samsung Internet?Opera Android? | Event
| Global scope objects | Fired at the global scope object when the user's preferred languages change |
load
| Event
| Window, elements
| 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
BroadcastChannel/message_event Support in all current engines. Firefox38+Safari15.4+Chrome54+ Opera?Edge79+ Edge (Legacy)?Internet ExplorerNo Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android? DedicatedWorkerGlobalScope/message_event Support in all current engines. Firefox3.5+Safari4+Chrome4+ Opera10.6+Edge79+ Edge (Legacy)12+Internet Explorer10+ Firefox Android?Safari iOS5+Chrome Android?WebView Android37+Samsung Internet?Opera Android11.5+ Support in all current engines. Firefox6+Safari5+Chrome6+ Opera12+Edge79+ Edge (Legacy)?Internet ExplorerNo Firefox Android45+Safari iOS5+Chrome Android?WebView Android?Samsung Internet?Opera Android12+ Support in all current engines. Firefox41+Safari5+Chrome2+ Opera10.6+Edge79+ Edge (Legacy)12+Internet Explorer10+ Firefox Android?Safari iOS?Chrome Android?WebView Android37+Samsung Internet?Opera Android11.5+ Support in all current engines. Firefox9+Safari4+Chrome60+ Opera?Edge79+ Edge (Legacy)12+Internet Explorer8+ Firefox Android?Safari iOS4+Chrome Android?WebView Android?Samsung Internet?Opera Android47+ Support in all current engines. Firefox3.5+Safari4+Chrome4+ Opera10.6+Edge79+ Edge (Legacy)12+Internet Explorer10+ Firefox Android?Safari iOS5+Chrome Android?WebView Android?Samsung Internet?Opera Android11.5+ | MessageEvent
| Window, EventSource, MessagePort, BroadcastChannel, DedicatedWorkerGlobalScope, Worker, ServiceWorkerContainer
| Fired at an object when it receives a message |
messageerror
BroadcastChannel/messageerror_event Support in all current engines. Firefox57+Safari15.4+Chrome60+ Opera?Edge79+ Edge (Legacy)?Internet ExplorerNo Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android47+ DedicatedWorkerGlobalScope/messageerror_event Support in all current engines. Firefox57+Safari16.4+Chrome60+ Opera?Edge79+ Edge (Legacy)18Internet ExplorerNo Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android47+ MessagePort/messageerror_event Support in all current engines. Firefox57+Safari16.4+Chrome60+ Opera?Edge79+ Edge (Legacy)18Internet ExplorerNo Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android47+ Support in all current engines. Firefox57+Safari16.4+Chrome60+ Opera?Edge79+ Edge (Legacy)18Internet ExplorerNo Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android47+ Support in all current engines. Firefox57+Safari16.4+Chrome60+ Opera?Edge79+ Edge (Legacy)18Internet ExplorerNo Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android47+ | MessageEvent
| Window, MessagePort, BroadcastChannel, DedicatedWorkerGlobalScope, Worker, ServiceWorkerContainer
| Fired at an object when it receives a message that cannot be deserialized |
navigate
| NavigateEvent
| Navigation
| Fired before the navigable navigates, reloads, traverses, or otherwise changes its URL |
navigateerror
| ErrorEvent
| Navigation
| Fired when a navigation does not complete successfully |
navigatesuccess
| Event
| Navigation
| Fired when a navigation completes successfully |
offline
Support in all current engines. Firefox9+Safari4+Chrome3+ Opera?Edge79+ Edge (Legacy)12+Internet Explorer9+ Firefox Android?Safari iOS3+Chrome Android?WebView Android37+Samsung Internet?Opera Android? | Event
| Global scope objects | Fired at the global scope object when the network connections fails |
online
Support in all current engines. Firefox9+Safari4+Chrome3+ Opera?Edge79+ Edge (Legacy)12+Internet Explorer9+ Firefox Android?Safari iOS3+Chrome Android?WebView Android37+Samsung Internet?Opera Android? | Event
| Global scope objects | Fired at the global scope object when the network connections returns |
open
Support in all current engines. Firefox6+Safari5+Chrome6+ Opera12+Edge79+ Edge (Legacy)?Internet ExplorerNo Firefox Android45+Safari iOS5+Chrome Android?WebView Android?Samsung Internet?Opera Android12+ | Event
| EventSource
| Fired at EventSource objects when a connection is established
|
pageswap
| PageSwapEvent
| Window
| Fired at the Window right before a document is unloaded as a result of a navigation.
|
pagehide
Support in all current engines. Firefox6+Safari5+Chrome3+ Opera?Edge79+ Edge (Legacy)12+Internet Explorer11 Firefox Android?Safari iOS?Chrome Android?WebView Android37+Samsung Internet?Opera Android? | PageTransitionEvent
| Window
| Fired at the Window when the page's session history entry stops
being the active entry
|
pagereveal
| PageRevealEvent
| Window
| Fired at the Window when the page begins to render for the first time after
it has been initialized or reactivated
|
pageshow
Support in all current engines. Firefox6+Safari5+Chrome3+ Opera?Edge79+ Edge (Legacy)12+Internet Explorer11 Firefox Android?Safari iOS?Chrome Android?WebView Android37+Samsung Internet?Opera Android? | PageTransitionEvent
| Window
| Fired at the Window when the page's session history entry
becomes the active entry
|
pointercancel
| PointerEvent
| Elements and Text nodes
| Fired at the source node when the user attempts to initiate a drag-and-drop operation |
popstate
Support in all current engines. Firefox4+Safari5+Chrome5+ Opera11.5+Edge79+ Edge (Legacy)12+Internet Explorer10+ Firefox Android?Safari iOS?Chrome Android?WebView Android37+Samsung Internet?Opera Android11.5+ | PopStateEvent
| Window
| Fired at the Window when in some cases of session history traversal
|
readystatechange
Document/readystatechange_event Support in all current engines. Firefox4+Safari5.1+Chrome9+ Opera12.1+Edge79+ Edge (Legacy)12+Internet Explorer4+ Firefox Android?Safari iOS?Chrome Android?WebView Android37+Samsung Internet?Opera Android12.1+ | Event
| Document
| Fired at the Document when it finishes parsing and again when all its subresources have finished loading
|
rejectionhandled
| PromiseRejectionEvent
| Global scope objects | Fired at global scope objects when a previously-unhandled promise rejection becomes handled |
reset
Support in all current engines. Firefox6+Safari3+Chrome1+ Opera12.1+Edge79+ Edge (Legacy)12+Internet Explorer9+ Firefox Android?Safari iOS1+Chrome Android?WebView Android37+Samsung Internet?Opera Android12.1+ | Event
| form elements
| Fired at a form element when it is reset
|
select
Support in all current engines. Firefox6+Safari1+Chrome1+ Opera12.1+Edge79+ Edge (Legacy)12+Internet Explorer9+ Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android12.1+ HTMLTextAreaElement/select_event Support in all current engines. Firefox6+Safari1+Chrome1+ Opera12.1+Edge79+ Edge (Legacy)12+Internet Explorer9+ Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android12.1+ | Event
| Form controls | Fired at form controls when their text selection is adjusted (whether by an API or by the user) |
storage
Support in all current engines. Firefox45+Safari4+Chrome1+ Opera?Edge79+ Edge (Legacy)15+Internet Explorer9+ Firefox Android?Safari iOS4+Chrome Android?WebView Android37+Samsung Internet?Opera Android? | StorageEvent
| Window
| Fired at Window event when the corresponding localStorage or sessionStorage storage areas change
|
submit
Support in all current engines. Firefox1+Safari3+Chrome1+ Opera8+Edge79+ Edge (Legacy)12+Internet Explorer9+ Firefox Android?Safari iOS1+Chrome Android?WebView Android?Samsung Internet?Opera Android10.1+ | SubmitEvent
| form elements
| Fired at a form element when it is submitted
|
toggle
HTMLDetailsElement/toggle_event Support in all current engines. Firefox49+Safari10.1+Chrome36+ Opera?Edge79+ Edge (Legacy)?Internet ExplorerNo Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android? Support in all current engines. Firefox🔰 114+Safaripreview+Chrome114+ Opera?Edge114+ Edge (Legacy)?Internet ExplorerNo Firefox Android?Safari iOS?Chrome Android?WebView Android?Samsung Internet?Opera Android? | ToggleEvent
| details and popover elements
| Fired at details elements when they open or close; fired on elements with the
popover attribute when they are transitioning between
showing and hidden
|
unhandledrejection
Window/unhandledrejection_event Support in all current engines. Firefox69+Safari11+Chrome49+ Opera?Edge79+ Edge (Legacy)?Internet ExplorerNo Firefox Android?Safari iOS11.3+Chrome Android?WebView Android?Samsung Internet?Opera Android? | PromiseRejectionEvent
| Global scope objects | Fired at global scope objects when a promise rejection goes unhandled |
unload
Support in all current engines. Firefox1+Safari3+Chrome1+ Opera4+Edge79+ Edge (Legacy)12+Internet Explorer4+ Firefox Android?Safari iOS1+Chrome Android?WebView Android?Samsung Internet?Opera Android10.1+ | Event
| Window
| Fired at the Window object when the page is going away
|
visibilitychange
Document/visibilitychange_event Support in all current engines. Firefox56+Safari14.1+Chrome62+ Opera49+Edge79+ Edge (Legacy)18Internet Explorer🔰 10+ Firefox Android?Safari iOS?Chrome Android?WebView Android62+Samsung Internet?Opera Android46+ | Event
| Document
| Fired at the Document object when the page becomes visible or hidden to the
user
|
HTTP headers
This section is non-normative.
The following HTTP request headers are defined by this specification:
The following HTTP response headers are defined by this specification:
- `
Cross-Origin-Embedder-Policy` - `
Cross-Origin-Embedder-Policy-Report-Only` - `
Cross-Origin-Opener-Policy` - `
Cross-Origin-Opener-Policy-Report-Only` - `
Origin-Agent-Cluster` - `
Refresh` - `
X-Frame-Options`
MIME types
This section is non-normative.
The following MIME types are mentioned in this specification:
application/atom+xml- Atom [ATOM]
application/json- JSON [JSON]
application/octet-stream- Generic binary data [RFC2046]
application/microdata+json- Microdata as JSON
application/rss+xml- RSS
application/wasm- WebAssembly [WASM]
application/x-www-form-urlencoded- Form submission
application/xhtml+xml- HTML
application/xml- XML [XML] [RFC7303]
image/gif- GIF images [GIF]
image/jpeg- JPEG images [JPEG]
image/png- PNG images [PNG]
image/svg+xml- SVG images [SVG]
multipart/form-data- Form submission [RFC7578]
multipart/mixed- Generic mixed content [RFC2046]
multipart/x-mixed-replace- Streaming server push
text/css- CSS [CSS]
text/event-stream- Server-sent event streams
text/javascript- JavaScript [JAVASCRIPT] [RFC9239]
text/json- JSON (legacy type)
text/plain- Generic plain text [RFC2046] [RFC3676]
text/html- HTML
text/ping- Hyperlink auditing
text/uri-list- List of URLs [RFC2483]
text/vcard- vCard [RFC6350]
text/vtt- WebVTT [WEBVTT]
text/xml- XML [XML] [RFC7303]
video/mp4- MPEG-4 video [RFC4337]
video/mpeg- MPEG video [RFC2046]