1. Index
    1. Elements
    2. Element content categories
    3. Attributes
    4. Element Interfaces
    5. All Interfaces
    6. Events
    7. MIME Types

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
aHyperlinkflow; phrasing*; interactive; palpablephrasingtransparent*globals; href; target; download; ping; rel; hreflang; type; referrerpolicyHTMLAnchorElement
abbrAbbreviationflow; phrasing; palpablephrasingphrasingglobalsHTMLElement
addressContact information for a page or article elementflow; palpableflowflow*globalsHTMLElement
areaHyperlink or dead area on an image mapflow; phrasingphrasing*emptyglobals; alt; coords; shape; href; target; download; ping; rel; referrerpolicyHTMLAreaElement
articleSelf-contained syndicatable or reusable compositionflow; sectioning; palpableflowflowglobalsHTMLElement
asideSidebar for tangentially related contentflow; sectioning; palpableflowflowglobalsHTMLElement
audioAudio playerflow; phrasing; embedded; interactive; palpable*phrasingsource*; track*; transparent*globals; src; crossorigin; preload; autoplay; loop; muted; controls controlslistHTMLAudioElement
bKeywordsflow; phrasing; palpablephrasingphrasingglobalsHTMLElement
baseBase URL and default target browsing context for hyperlinks and formsmetadataheademptyglobals; href; targetHTMLBaseElement
bdiText directionality isolationflow; phrasing; palpablephrasingphrasingglobalsHTMLElement
bdoText directionality formattingflow; phrasing; palpablephrasingphrasingglobalsHTMLElement
blockquoteA section quoted from another sourceflow; sectioning root; palpableflowflowglobals; citeHTMLQuoteElement
bodyDocument bodysectioning roothtmlflowglobals; onafterprint; onbeforeprint; onbeforeunload; onhashchange; onlanguagechange; onmessage; onoffline; ononline; onpagehide; onpageshow; onpopstate; onrejectionhandled; onstorage; onunhandledrejection; onunloadHTMLBodyElement
brLine break, e.g. in poem or postal addressflow; phrasingphrasingemptyglobalsHTMLBRElement
buttonButton controlflow; phrasing; interactive; listed; labelable; submittable; form-associated; palpablephrasingphrasing*globals; autofocus; disabled; form; formaction; formenctype; formmethod; formnovalidate; formtarget; name; type; valueHTMLButtonElement
canvasScriptable bitmap canvasflow; phrasing; embedded; palpablephrasingtransparentglobals; width; heightHTMLCanvasElement
captionTable captionnonetableflow*globalsHTMLTableCaptionElement
citeTitle of a workflow; phrasing; palpablephrasingphrasingglobalsHTMLElement
codeComputer codeflow; phrasing; palpablephrasingphrasingglobalsHTMLElement
colTable columnnonecolgroupemptyglobals; spanHTMLTableColElement
colgroupGroup of columns in a tablenonetablecol*; template*globals; spanHTMLTableColElement
dataMachine-readable equivalentflow; phrasing; palpablephrasingphrasingglobals; valueHTMLDataElement
datalistContainer for options for combo box controlflow; phrasingphrasingphrasing*; option*; script-supporting elements*globalsHTMLDataListElement
ddContent for corresponding dt element(s)nonedl; div*flowglobalsHTMLElement
delA removal from the documentflow; phrasing*phrasingtransparentglobals; cite; datetimeHTMLModElement
detailsDisclosure control for hiding detailsflow; sectioning root; interactive; palpableflowsummary*; flowglobals; openHTMLDetailsElement
dfnDefining instanceflow; phrasing; palpablephrasingphrasing*globalsHTMLElement
dialogDialog box or windowflow; sectioning rootflowflowglobals; openHTMLDialogElement
divGeneric flow container, or container for name-value groups in dl elementsflow; palpableflow; dlflowglobalsHTMLDivElement
dlAssociation list consisting of zero or more name-value groupsflow; palpableflowdt*; dd*; div*; script-supporting elementsglobalsHTMLDListElement
dtLegend for corresponding dd element(s)nonedl; div*flow*globalsHTMLElement
emStress emphasisflow; phrasing; palpablephrasingphrasingglobalsHTMLElement
embedPluginflow; phrasing; embedded; interactive; palpablephrasingemptyglobals; src; type; width; height; any*HTMLEmbedElement
fieldsetGroup of form controlsflow; sectioning root; listed; form-associated; palpableflowlegend*; flowglobals; disabled; form; nameHTMLFieldSetElement
figcaptionCaption for figurenonefigureflowglobalsHTMLElement
figureFigure with optional captionflow; sectioning root; palpableflowfigcaption*; flowglobalsHTMLElement
footerFooter for a page or sectionflow; palpableflowflow*globalsHTMLElement
formUser-submittable formflow; palpableflowflow*globals; accept-charset; action; autocomplete; enctype; method; name; novalidate; targetHTMLFormElement
h1, h2, h3, h4, h5, h6Section headingflow; heading; palpablehgroup; flowphrasingglobalsHTMLHeadingElement
headContainer for document metadatanonehtmlmetadata content*globalsHTMLHeadElement
headerIntroductory or navigational aids for a page or sectionflow; palpableflowflow*globalsHTMLElement
hgroupheading groupflow; heading; palpableflowOne or more h1, h2, h3, h4, h5, h6, and templateglobalsHTMLElement
hrThematic breakflowflowemptyglobalsHTMLHRElement
htmlRoot elementnonenone*head*; body*globals; manifestHTMLHtmlElement
iAlternate voiceflow; phrasing; palpablephrasingphrasingglobalsHTMLElement
iframeNested browsing contextflow; phrasing; embedded; interactive; palpablephrasingemptyglobals; src; srcdoc; name; sandbox; allowfullscreen; allowpaymentrequest; allowusermedia; width; height; referrerpolicyHTMLIFrameElement
imgImageflow; phrasing; embedded; interactive*; form-associated; palpablephrasing; pictureemptyglobals; alt; src; srcset; crossorigin; usemap; ismap; width; height; referrerpolicyHTMLImageElement
inputForm controlflow; phrasing; interactive*; listed; labelable; submittable; resettable; form-associated; palpable*phrasingemptyglobals; accept; alt; autocomplete; autofocus; checked; dirname; disabled; form; formaction; formenctype; formmethod; formnovalidate; formtarget; height; inputmode; list; max; maxlength; min; minlength; multiple; name; pattern; placeholder; readonly; required; size; src; step; type; value; widthHTMLInputElement
insAn addition to the documentflow; phrasing*; palpablephrasingtransparentglobals; cite; datetimeHTMLModElement
kbdUser inputflow; phrasing; palpablephrasingphrasingglobalsHTMLElement
labelCaption for a form controlflow; phrasing; interactive; palpablephrasingphrasing*globals; forHTMLLabelElement
legendCaption for fieldsetnonefieldsetphrasingglobalsHTMLLegendElement
liList itemnoneol; ul; menu*flowglobals; value*HTMLLIElement
linkLink metadatametadata; flow*; phrasing*head; noscript*; phrasing*emptyglobals; href; crossorigin; rel; as; media; hreflang; type; sizes; referrerpolicy; nonce; integrityHTMLLinkElement
mainContainer for the dominant contents of another elementflow; palpableflowflowglobalsHTMLElement
mapImage mapflow; phrasing*; palpablephrasingtransparent; area*globals; nameHTMLMapElement
markHighlightflow; phrasing; palpablephrasingphrasingglobalsHTMLElement
MathML mathMathML rootflow; phrasing; embedded; palpablephrasingper [MATHML]per [MATHML]Element
menuMenu of commandsflow; palpable*flow; menu*li*; flow*; menuitem*; hr*; menu*; script-supporting elements*globals; type; labelHTMLMenuElement
menuitemMenu commandnonemenu*text*globals; type; label; icon; disabled; checked; radiogroup; default HTMLMenuItemElement
metaText metadatametadata; flow*; phrasing*head; noscript*; phrasing*emptyglobals; name; http-equiv; content; charsetHTMLMetaElement
meterGaugeflow; phrasing; labelable; palpablephrasingphrasing*globals; value; min; max; low; high; optimumHTMLMeterElement
navSection with navigational linksflow; sectioning; palpableflowflowglobalsHTMLElement
noscriptFallback content for scriptmetadata; flow; phrasinghead*; phrasing*varies*globalsHTMLElement
objectImage, nested browsing context, or pluginflow; phrasing; embedded; interactive*; listed; submittable; form-associated; palpablephrasingparam*; transparentglobals; data; type; typemustmatch; name; usemap; form; width; heightHTMLObjectElement
olOrdered listflow; palpable*flowli; script-supporting elementsglobals; reversed; start; typeHTMLOListElement
optgroupGroup of options in a list boxnoneselectoption; script-supporting elementsglobals; disabled; labelHTMLOptGroupElement
optionOption in a list box or combo box controlnoneselect; datalist; optgrouptext*globals; disabled; label; selected; valueHTMLOptionElement
outputCalculated output valueflow; phrasing; listed; labelable; resettable; form-associated; palpablephrasingphrasingglobals; for; form; nameHTMLOutputElement
pParagraphflow; palpableflowphrasingglobalsHTMLParagraphElement
paramParameter for objectnoneobjectemptyglobals; name; valueHTMLParamElement
pictureImageflow; phrasing; embeddedphrasingsource*; one img; script-supporting elementsglobalsHTMLPictureElement
preBlock of preformatted textflow; palpableflowphrasingglobalsHTMLPreElement
progressProgress barflow; phrasing; labelable; palpablephrasingphrasing*globals; value; maxHTMLProgressElement
qQuotationflow; phrasing; palpablephrasingphrasingglobals; citeHTMLQuoteElement
rpParenthesis for ruby annotation textnonerubytextglobalsHTMLElement
rtRuby annotation textnonerubyphrasingglobalsHTMLElement
rubyRuby annotation(s)flow; phrasing; palpablephrasingphrasing; rt; rp*globalsHTMLElement
sInaccurate textflow; phrasing; palpablephrasingphrasingglobalsHTMLElement
sampComputer outputflow; phrasing; palpablephrasingphrasingglobalsHTMLElement
scriptEmbedded scriptmetadata; flow; phrasing; script-supportinghead; phrasing; script-supportingscript, data, or script documentation*globals; src; type; charset; async; defer; crossorigin; nonce; integrityHTMLScriptElement
sectionGeneric document or application sectionflow; sectioning; palpableflowflowglobalsHTMLElement
selectList box controlflow; phrasing; interactive; listed; labelable; submittable; resettable; form-associated; palpablephrasingoption; optgroup; script-supporting elementsglobals; autocomplete; autofocus; disabled; form; multiple; name; required; sizeHTMLSelectElement
slotShadow tree slotflow; phrasingphrasingtransparentglobals; nameHTMLSlotElement
smallSide commentflow; phrasing; palpablephrasingphrasingglobalsHTMLElement
sourceImage source for img or media source for video or audiononepicture; video; audioemptyglobals; src; type srcset; sizes; mediaHTMLSourceElement
spanGeneric phrasing containerflow; phrasing; palpablephrasingphrasingglobalsHTMLSpanElement
strongImportanceflow; phrasing; palpablephrasingphrasingglobalsHTMLElement
styleEmbedded styling informationmetadatahead; noscript*varies*globals; media; nonce; typeHTMLStyleElement
subSubscriptflow; phrasing; palpablephrasingphrasingglobalsHTMLElement
summaryCaption for detailsnonedetailsphrasingglobalsHTMLElement
supSuperscriptflow; phrasing; palpablephrasingphrasingglobalsHTMLElement
SVG svgSVG rootflow; phrasing; embedded; palpablephrasingper [SVG]per [SVG]SVGSVGElement
tableTableflow; palpableflowcaption*; colgroup*; thead*; tbody*; tfoot*; tr*; script-supporting elementsglobalsHTMLTableElement
tbodyGroup of rows in a tablenonetabletr; script-supporting elementsglobalsHTMLTableSectionElement
tdTable cellsectioning roottrflowglobals; colspan; rowspan; headersHTMLTableCellElement
templateTemplatemetadata; flow; phrasing; script-supportingmetadata; phrasing; script-supporting; colgroup*emptyglobalsHTMLTemplateElement
textareaMultiline text controlsflow; phrasing; interactive; listed; labelable; submittable; resettable; form-associated; palpablephrasingtextglobals; autofocus; cols; dirname; disabled; form; inputmode; maxlength; minlength; name; placeholder; readonly; required; rows; wrapHTMLTextAreaElement
tfootGroup of footer rows in a tablenonetabletr; script-supporting elementsglobalsHTMLTableSectionElement
thTable header cellinteractive*trflow*globals; colspan; rowspan; headers; scope; abbrHTMLTableCellElement
theadGroup of heading rows in a tablenonetabletr; script-supporting elementsglobalsHTMLTableSectionElement
timeMachine-readable equivalent of date- or time-related dataflow; phrasing; palpablephrasingphrasingglobals; datetimeHTMLTimeElement
titleDocument titlemetadataheadtext*globalsHTMLTitleElement
trTable rownonetable; thead; tbody; tfootth*; td; script-supporting elementsglobalsHTMLTableRowElement
trackTimed text tracknoneaudio; videoemptyglobals; default; kind; label; src; srclangHTMLTrackElement
uKeywordsflow; phrasing; palpablephrasingphrasingglobalsHTMLElement
ulListflow; palpable*flowli; script-supporting elementsglobalsHTMLUListElement
varVariableflow; phrasing; palpablephrasingphrasingglobalsHTMLElement
videoVideo playerflow; phrasing; embedded; interactive; palpablephrasingsource*; track*; transparent*globals; src; crossorigin; poster; preload; autoplay; playsinline; loop; muted; controls; controlslist; width; heightHTMLVideoElement
wbrLine breaking opportunityflow; phrasingphrasingemptyglobalsHTMLElement
autonomous custom elementsAuthor-defined elementsflow; phrasing; palpableflow; phrasingtransparentglobals; any, as decided by the element's authorSupplied 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; main; map; mark; MathML math; menu; meter; nav; noscript; object; ol; output; p; picture; pre; progress; q; ruby; s; samp; script; 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); 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; 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); object (if the usemap attribute is present); video (if the controls attribute is present)
Sectioning roots blockquote; body; details; dialog; fieldset; figure; td
Form-associated elements button; fieldset; input; label; object; output; select; textarea; img
Listed elements button; fieldset; input; object; output; select; textarea
Submittable elements button; input; object; select; textarea
Resettable elements input; output; select; textarea
Labelable elements button; input; 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; label; main; map; mark; MathML math; meter; nav; object; output; p; pre; progress; q; ruby; s; samp; 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 type attribute is in the toolbar 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
Script-supporting elements script; template

* The tabindex attribute can also make any element into interactive content.

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 types with no parameters or audio/*, video/*, or image/*
accept-charset form Character encodings to use for form submission Ordered set of unique space-separated tokens, ASCII case-insensitive, consisting of labels of ASCII-compatible 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
allowfullscreen iframe Whether to allow the iframe's contents to use requestFullscreen() Boolean attribute
allowpaymentrequest iframe Whether the iframe's contents are allowed to use the PaymentRequest interface to make payment requests Boolean attribute
allowusermedia iframe Whether to allow the iframe's contents to use getUserMedia() Boolean attribute
alt area; img; input Replacement text for use when images are not available Text*
as link Destination for a preload request (for rel="preload") Destination keyword
async script Execute script when available, without blocking Boolean attribute
autocomplete form Default setting for autofill feature for controls in the form "on"; "off"
autocomplete input; select; textarea Hint for form autofill feature Autofill field name and related tokens*
autofocus button; input; 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
charset meta Character encoding declaration Encoding label*
charset script Character encoding of the external script resource Encoding label*
checked menuitem; 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
color link Color to use when customizing a site's icon (for rel="mask-icon") CSS <color>
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
controlslist audio; video Show/hide specific user agent controls Unordered set of unique space-separated tokens, ASCII case-insensitive, consisting of "nodownload", "nofullscreen", and "noremoteplayback".
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
default menuitem Mark the command as being a default command Boolean attribute
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; menuitem; fieldset; input; optgroup; option; select; textarea Whether the form control is disabled Boolean attribute
download a; area Whether to download the resource instead of navigating to it, and its file name if so Text
draggable HTML elements Whether the element is draggable "true"; "false"
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; 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; link Language of the linked resource Valid BCP 47 language tag
http-equiv meta Pragma directive Text*
icon menuitem Icon for the command Valid non-empty URL potentially surrounded by spaces
id HTML elements The element's ID Text*
inputmode input; textarea Hint for selecting an input modality "verbatim"; "latin"; "latin-name"; "latin-prose"; "full-width-latin"; "kana"; "kana-name"; "katakana"; "numeric"; "tel"; "email"; "url"
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, 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*
kind track The type of text track "subtitles"; "captions"; "descriptions"; "chapters"; "metadata"
label menuitem; 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 link; source; style Applicable media Valid media query list
method form HTTP method 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 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
name slot Name of shadow tree slot Text
nomodule script Prevents execution in user agents that support module scripts Boolean attribute
nonce link; script; style 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
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 menuitem 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
referrerpolicy a; area; iframe; img; link Determines the 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 Set of space-separated tokens*
rel 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-modals", "allow-orientation-lock", "allow-pointer-lock", "allow-popups", "allow-popups-to-escape-sandbox", "allow-presentation", "allow-same-origin", "allow-scripts" and "allow-top-navigation"
scope th Specifies which cells the header cell applies to "row"; "col"; "rowgroup"; "colgroup"
scope link A scope url service worker registration (for rel="serviceworker") Valid URL potentially surrounded by spaces
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*
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"
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
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 the relative order of the element for the purposes of sequential focus navigation Valid integer
target a; area Browsing context for hyperlink navigation Valid browsing context name or keyword
target base Default browsing context for hyperlink navigation and form submission Valid browsing context name or keyword
target form Browsing context for form submission Valid browsing context name or keyword
title HTML elements Advisory information for the element Text
title abbr; dfn Full term or expansion of abbreviation Text
title input Description of pattern (when used with pattern attribute) Text
title menuitem Hint describing the command 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
type button Type of button "submit"; "reset"; "button"
type embed; object; script; source; style Type of embedded resource Valid MIME type
type input Type of form control input type keyword
type menu Type of menu "context"; "toolbar"
type menuitem Type of command "command"; "checkbox"; "radio"
type ol Kind of list marker "1"; "a"; "A"; "i"; "I"
typemustmatch object Whether the type attribute and the Content-Type value need to match for the resource to be used Boolean attribute
usecache link Whether to set use cache to true for a service worker registration (for rel="serviceworker") 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
workertype link A service worker type for a service worker registration (for rel="serviceworker") "classic"; "module"
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
onauxclick HTML elements auxclick 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 HTML elements blur event handler Event handler content attribute
oncancel HTML elements cancel 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
onclose HTML elements close event handler Event handler content attribute
oncontextmenu HTML elements contextmenu event handler Event handler content attribute
oncopy HTML elements copy event handler Event handler content attribute
oncuechange HTML elements cuechange event handler Event handler content attribute
oncut HTML elements cut 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
ondragexit HTML elements dragexit 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 HTML elements error event handler 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
onlanguagechange body languagechange 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
onloadend HTML elements loadend 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
onmouseenter HTML elements mouseenter event handler Event handler content attribute
onmouseleave HTML elements mouseleave 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
onwheel HTML elements wheel 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
onpaste HTML elements paste event handler 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 HTML elements resize event handler Event handler content attribute
onrejectionhandled body rejectionhandled 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
ontoggle HTML elements toggle event handler Event handler content attribute
onunhandledrejection body unhandledrejection event handler for Window object 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

Element Interfaces

This section is non-normative.

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
menuitem HTMLMenuItemElement : HTMLElement
data HTMLDataElement : HTMLElement
datalist HTMLDataListElement : HTMLElement
dd HTMLElement
del HTMLModElement : HTMLElement
details HTMLDetailsElement : HTMLElement
dfn HTMLElement
dialog HTMLDialogElement : 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
h1 HTMLHeadingElement : HTMLElement
h2 HTMLHeadingElement : HTMLElement
h3 HTMLHeadingElement : HTMLElement
h4 HTMLHeadingElement : HTMLElement
h5 HTMLHeadingElement : HTMLElement
h6 HTMLHeadingElement : HTMLElement
head HTMLHeadElement : 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
label HTMLLabelElement : HTMLElement
legend HTMLLegendElement : HTMLElement
li HTMLLIElement : HTMLElement
link HTMLLinkElement : HTMLElement
main 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
picture HTMLPictureElement : 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
slot HTMLSlotElement : 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 HTMLTableCellElement : HTMLElement
template HTMLTemplateElement : HTMLElement
textarea HTMLTextAreaElement : HTMLElement
tfoot HTMLTableSectionElement : HTMLElement
th 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
custom elements supplied by the element's author (inherits from HTMLElement)

All Interfaces

This section is non-normative.

Events

This section is non-normative.

List of events
Event Interface Interesting targets Description
abort Event Window Fired at the Window when the download was aborted by the user
DOMContentLoaded Event Document Fired at the Document once the parser has finished
afterprint Event Window Fired at the Window after printing
beforeprint Event Window Fired at the Window before printing
beforeunload 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 Event dialog elements Fired at dialog elements when they are canceled by the user (e.g. by pressing the Escape key)
change Event Form controls Fired at controls when the user commits a value change (see also the input event)
click MouseEvent 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 Event dialog elements, WebSocket Fired at dialog elements when they are closed, and at WebSocket elements when the connection is terminated
connect MessageEvent SharedWorkerGlobalScope Fired at a shared worker's global scope when a new client connects
contextmenu Event Elements Fired at elements when the user requests their context menu
copy Event Elements Fired at elements when the user copies data to the clipboard
cut Event Elements Fired at elements when the user copies the selected data on the clipboard and removes the selection from the document
error 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
hashchange HashChangeEvent Window Fired at the Window when the fragment part of the document's URL changes
input

Support: input-eventChrome for Android 56+Chrome 15+UC Browser for Android 11+iOS Safari 5.0+Firefox 3.6+IE 10+Samsung Internet 4+Opera Mini NoneAndroid Browser 2.3+Safari 5.1+Edge 12+Opera 12.1+

Source: caniuse.com

Event Form controls Fired at controls when the user changes the value (see also the change event)
invalid Event Form controls Fired at controls during form validation if they do not satisfy their constraints
languagechange 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
loadend Event or ProgressEvent img elements Fired at img elements after a successful load
loadstart ProgressEvent img elements Fired at img elements when a load begins (see also media element events)
message MessageEvent Window, EventSource, WebSocket, MessagePort, BroadcastChannel, DedicatedWorkerGlobalScope, Worker, ServiceWorkerContainer Fired at an object when it receives a message
offline Event Global scope objects Fired at the global scope object when the network connections fails
online Event Global scope objects Fired at the global scope object when the network connections returns
open Event EventSource, WebSocket Fired at networking-related objects when a connection is established
pagehide PageTransitionEvent Window Fired at the Window when the page's entry in the session history stops being the current entry
pageshow

Support: page-transition-eventsChrome for Android 56+Chrome 4+UC Browser for Android 11+iOS Safari 5.0+Firefox 2+IE 11+Samsung Internet 4+Opera Mini NoneAndroid Browser 2.3+Safari 5+Edge 12+Opera 15+

Source: caniuse.com

PageTransitionEvent Window Fired at the Window when the page's entry in the session history becomes the current entry
paste Event Elements Fired at elements when the user will insert the clipboard data in the most suitable format (if any) supported for the given context
popstate PopStateEvent Window Fired at the Window when the user navigates the session history
progress ProgressEvent img elements Fired at img elements during a CORS-same-origin image load (see also media element events)
readystatechange 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 Event form elements Fired at a form element when it is reset
select Event Form controls Fired at form controls when their text selection is adjusted (whether by an API or by the user)
show RelatedEvent menu elements Fired at a menu element when it is shown as a context menu
storage StorageEvent Window Fired at Window event when the corresponding localStorage or sessionStorage storage areas change
submit Event form elements Fired at a form element when it is submitted
toggle Event details element Fired at details elements when they open or close
unhandledrejection PromiseRejectionEvent Global scope objects Fired at global scope objects when a promise rejection goes unhandled
unload Event Window Fired at the Window object when the page is going away

See also media element events, application cache events, and drag-and-drop events.

MIME Types

This section is non-normative.

The following MIME types are mentioned in this specification:

application/atom+xml
Atom [ATOM]
application/ecmascript
JavaScript (legacy type) [JAVASCRIPT]
application/javascript
JavaScript (legacy type) [JAVASCRIPT]
application/json
JSON [JSON]
application/x-ecmascript
JavaScript (legacy type) [JAVASCRIPT]
application/x-javascript
JavaScript (legacy type) [JAVASCRIPT]
application/octet-stream
Generic binary data [RFC2046]
application/microdata+json
Microdata as JSON
application/rss+xml
RSS
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/cache-manifest
Offline application cache manifests
text/css
CSS [CSS]
text/ecmascript
JavaScript (legacy type) [JAVASCRIPT]
text/event-stream
Server-sent event streams
text/javascript
JavaScript [JAVASCRIPT]
text/javascript1.0
JavaScript (legacy type) [JAVASCRIPT]
text/javascript1.1
JavaScript (legacy type) [JAVASCRIPT]
text/javascript1.2
JavaScript (legacy type) [JAVASCRIPT]
text/javascript1.3
JavaScript (legacy type) [JAVASCRIPT]
text/javascript1.4
JavaScript (legacy type) [JAVASCRIPT]
text/javascript1.5
JavaScript (legacy type) [JAVASCRIPT]
text/jscript
JavaScript (legacy type) [JAVASCRIPT]
text/json
JSON (legacy type)
text/livescript
JavaScript (legacy type) [JAVASCRIPT]
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/x-ecmascript
JavaScript (legacy type) [JAVASCRIPT]
text/x-javascript
JavaScript (legacy type) [JAVASCRIPT]
text/xml
XML [XML] [RFC7303]
video/mp4
MPEG-4 video [RFC4337]
video/mpeg
MPEG video [RFC2046]