This is a work in progress! For the latest updates from the HTML WG, possibly including important bug fixes, please look at the editor's draft instead.
The following sections only cover conforming elements and features.
This section is non-normative.
An asterisk (*) in a cell indicates that the actual rules are more complicated than indicated in the table above.
This section is non-normative.
This section is non-normative.
Attribute | Element(s) | Description | Value |
---|---|---|---|
accept
| input
| Hint for expected file type in file upload controls | Set of comma-separated tokens* consisting of valid MIME types with no parameters or audio/* , video/* , or image/*
|
accept-charset
| form
| Character encodings to use for form submission | Ordered set of unique space-separated tokens, ASCII case-insensitive, consisting of preferred MIME names of ASCII-compatible character encodings* |
accesskey
| HTML elements | Keyboard shortcut to activate or focus element | Ordered set of unique space-separated tokens, case-sensitive, consisting of one Unicode code point in length |
action
| form
| URL to use for form submission | Valid URL potentially surrounded by spaces |
alt
| area ;
img ;
input
| Replacement text for use when images are not available | Text* |
async
| script
| Execute script asynchronously | Boolean attribute |
autocomplete
| form ;
input
| Prevent the user agent from providing autocompletions for the form control(s) | "on "; "off "
|
autofocus
| button ;
input ;
keygen ;
select ;
textarea
| Automatically focus the form control when the page is loaded | Boolean attribute |
autoplay
| audio ;
video
| Hint that the media resource can be started automatically when the page is loaded | Boolean attribute |
challenge
| keygen
| String to package with the generated and signed public key | Text |
charset
| meta
| Character encoding declaration | Preferred MIME name of an encoding* |
charset
| script
| Character encoding of the external script resource | Preferred MIME name of an encoding* |
checked
| command ;
input
| Whether the command or control is checked | Boolean attribute |
cite
| blockquote ;
del ;
ins ;
q
| Link to the source of the quotation or more information about the edit | Valid URL potentially surrounded by spaces |
class
| HTML elements | Classes to which the element belongs | Set of space-separated tokens |
cols
| textarea
| Maximum number of characters per line | Valid non-negative integer greater than zero |
colspan
| td ;
th
| Number of columns that the cell is to span | Valid non-negative integer greater than zero |
content
| meta
| Value of the element | Text* |
contenteditable
| HTML elements | Whether the element is editable | "true "; "false "
|
contextmenu
| HTML elements | The element's context menu | ID* |
controls
| audio ;
video
| Show user agent controls | Boolean attribute |
coords
| area
| Coordinates for the shape to be created in an image map | Valid list of integers* |
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
| Value of the element | Valid date or time string* |
default
| track
| Enable the track if no other text track is more suitable. | Boolean attribute |
defer
| script
| Defer script execution | Boolean attribute |
dir
| HTML elements | The text directionality of the element | "ltr "; "rtl "
|
dirname
| input ;
textarea
| Name of form field to use for sending the element's directionality in form submission | Text* |
disabled
| button ;
command ;
fieldset ;
input ;
keygen ;
optgroup ;
option ;
select ;
textarea
| Whether the form control is disabled | Boolean attribute |
draggable
| HTML elements | Whether the element is draggable | "true "; "false "
|
dropzone
| HTML elements | Accepted item types for drag-and-drop | Unordered set of unique space-separated tokens, ASCII case-insensitive, consisting of accepted types and drag feedback* |
enctype
| form
| Form data set encoding type to use for form submission | "application/x-www-form-urlencoded "; "multipart/form-data "; "text/plain "
|
for
| label
| Associate the label with form control | ID* |
for
| output
| Specifies controls from which the output was calculated | Unordered set of unique space-separated tokens, case-sensitive, consisting of IDs* |
form
| button ;
fieldset ;
input ;
keygen ;
label ;
meter ;
object ;
output ;
progress ;
select ;
textarea
| Associates the control with a form element
| ID* |
formaction
| button ;
input
| URL to use for form submission | Valid URL potentially surrounded by spaces |
formenctype
| button ;
input
| Form data set encoding type to use for form submission | "application/x-www-form-urlencoded "; "multipart/form-data "; "text/plain "
|
formmethod
| button ;
input
| HTTP method to use for form submission | "GET "; "POST "
|
formnovalidate
| button ;
input
| Bypass form control validation for form submission | Boolean attribute |
formtarget
| button ;
input
| Browsing context for form submission | Valid browsing context name or keyword |
headers
| td ;
th
| The header cells for this cell | Unordered set of unique space-separated tokens, case-sensitive, consisting of IDs* |
height
| canvas ;
embed ;
iframe ;
img ;
input ;
object ;
video
| Vertical dimension | Valid non-negative integer |
hidden
| HTML elements | Whether the element is relevant | Boolean attribute |
high
| meter
| Low limit of high range | Valid floating point number* |
href
| a ;
area
| Address of the hyperlink | Valid URL potentially surrounded by spaces |
href
| link
| Address of the hyperlink | Valid non-empty URL potentially surrounded by spaces |
href
| base
| Document base URL | Valid URL potentially surrounded by spaces |
hreflang
| a ;
area ;
link
| Language of the linked resource | Valid BCP 47 language tag |
http-equiv
| meta
| Pragma directive | Text* |
icon
| command
| Icon for the command | Valid non-empty URL potentially surrounded by spaces |
id
| HTML elements | The element's ID | Text* |
ismap
| img
| Whether the image is a server-side image map | Boolean attribute |
keytype
| keygen
| The type of cryptographic key to generate | Text* |
kind
| track
| The type of text track | "subtitles ";
"captions ";
"descriptions ";
"chapters ";
"metadata "
|
label
| command ;
menu ;
optgroup ;
option ;
track
| User-visible label | Text |
lang
| HTML elements | Language of the element | Valid BCP 47 language tag or the empty string |
list
| input
| List of autocomplete options | ID* |
loop
| audio ;
video
| Whether to loop the media resource | Boolean attribute |
low
| meter
| High limit of low range | Valid floating point number* |
manifest
| html
| Application cache manifest | Valid non-empty URL potentially surrounded by spaces |
max
| input
| Maximum value | varies* |
max
| meter ;
progress
| Upper bound of range | Valid floating point number* |
maxlength
| input ;
textarea
| Maximum length of value | Valid non-negative integer |
media
| a ;
area ;
link ;
source ;
style
| Applicable media | Valid media query |
method
| form
| HTTP method to use for form submission | "GET "; "POST "
|
min
| input
| Minimum value | varies* |
min
| meter
| Lower bound of range | Valid floating point number* |
multiple
| input ;
select
| Whether to allow multiple values | Boolean attribute |
name
| button ;
fieldset ;
input ;
keygen ;
output ;
select ;
textarea
| Name of form control to use for form submission and in the form.elements API
| Text* |
name
| form
| Name of form to use in the document.forms API
| Text* |
name
| iframe ;
object
| Name of nested browsing context | Valid browsing context name or keyword |
name
| map
| Name of image map to reference from the usemap attribute
| Text* |
name
| meta
| Metadata name | Text* |
name
| param
| Name of parameter | Text |
novalidate
| form
| Bypass form control validation for form submission | Boolean attribute |
open
| details
| Whether the details are visible | Boolean attribute |
optimum
| meter
| Optimum value in gauge | Valid floating point number* |
pattern
| input
| Pattern to be matched by the form control's value | Regular expression matching the JavaScript Pattern production |
placeholder
| input ;
textarea
| User-visible label to be placed within the form control | Text* |
poster
| video
| Poster frame to show prior to video playback | Valid non-empty URL potentially surrounded by spaces |
preload
| audio ;
video
| Hints how much buffering the media resource will likely need | "none ";
"metadata ";
"auto "
|
pubdate
| time
| Whether the element's value represents a publication time for the nearest article or body
| Boolean attribute |
radiogroup
| command
| Name of group of commands to treat as a radio button group | Text |
readonly
| input ;
textarea
| Whether to allow the value to be edited by the user | Boolean attribute |
rel
| a ;
area ;
link
| Relationship between the document containing the hyperlink and the destination resource | Set of space-separated tokens* |
required
| input ;
select ;
textarea
| Whether the control is required for form submission | Boolean attribute |
reversed
| ol
| Number the list backwards | Boolean attribute |
rows
| textarea
| Number of lines to show | Valid non-negative integer greater than zero |
rowspan
| td ;
th
| Number of rows that the cell is to span | Valid non-negative integer |
sandbox
| iframe
| Security rules for nested content | Unordered set of unique space-separated tokens, ASCII case-insensitive, consisting of
"allow-same-origin ",
"allow-forms ", and
"allow-scripts "
|
spellcheck
| HTML elements | Whether the element is to have its spelling and grammar checked | "true "; "false "
|
scope
| th
| Specifies which cells the header cell applies to | "row ";
"col ";
"rowgroup ";
"colgroup "
|
scoped
| style
| Whether the styles apply to the entire document or just the parent subtree | Boolean attribute |
seamless
| iframe
| Whether to apply the document's styles to the nested content | Boolean attribute |
selected
| option
| Whether the option is selected by default | Boolean attribute |
shape
| area
| The kind of shape to be created in an image map | "circle ";
"default ";
"poly ";
"rect "
|
size
| input ;
select
| Size of the control | Valid non-negative integer greater than zero |
sizes
| link
| Sizes of the icons (for rel ="icon ")
| Unordered set of unique space-separated tokens, ASCII case-insensitive, consisting of sizes* |
span
| col ;
colgroup
| Number of columns spanned by the element | Valid non-negative integer greater than zero |
src
| audio ;
embed ;
iframe ;
img ;
input ;
script ;
source ;
track ;
video
| Address of the resource | Valid non-empty URL potentially surrounded by spaces |
srcdoc
| iframe
| A document to render in the iframe
| The source of an iframe srcdoc document*
|
srclang
| track
| Language of the text track | Valid BCP 47 language tag |
start
| ol
| Ordinal value of the first item | Valid integer |
step
| input
| Granularity to be matched by the form control's value | Valid floating point number greater than zero, or "any "
|
style
| HTML elements | Presentational and formatting instructions | CSS declarations* |
summary
| table
| Explanatory text for complex tables for users of screen readers | Text* |
tabindex
| HTML elements | Whether the element is focusable, and the relative order of the element for the purposes of sequential focus navigation | Valid integer |
target
| a ;
area
| Browsing context for hyperlink navigation | Valid browsing context name or keyword |
target
| base
| Default browsing context for hyperlink navigation and form submission | Valid browsing context name or keyword |
target
| form
| Browsing context for form submission | Valid browsing context name or keyword |
title
| HTML elements | Advisory information for the element | Text |
title
| abbr ;
dfn
| Full term or expansion of abbreviation | Text |
title
| command
| Hint describing the command | Text |
title
| link
| Title of the link | Text |
title
| link ;
style
| Alternative style sheet set name | Text |
type
| a ;
area ;
link
| Hint for the type of the referenced resource | Valid MIME type |
type
| button
| Type of button | "submit ";
"reset ";
"button "
|
type
| button ;
input
| Type of form control | input type keyword
|
type
| command
| Type of command | "command ";
"checkbox ";
"radio "
|
type
| embed ;
object ;
script ;
source ;
style
| Type of embedded resource | Valid MIME type |
type
| menu
| Type of menu | "context "; "toolbar "
|
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
| input
| Value of the form control | varies* |
value
| li
| Ordinal value of the list item | Valid integer |
value
| meter ;
progress
| Current value of the element | Valid floating point number |
value
| param
| Value of parameter | Text |
width
| canvas ;
embed ;
iframe ;
img ;
input ;
object ;
video
| Horizontal dimension | Valid non-negative integer |
wrap
| textarea
| How the value of the form control is to be wrapped for form submission | "soft ";
"hard "
|
An asterisk (*) in a cell indicates that the actual rules are more complicated than indicated in the table above.
This section is non-normative.
This section is non-normative.
Event | Interface | Description |
---|---|---|
DOMContentLoaded
| Event
| Fired at the Document once it and its scripts have loaded, without waiting for other subresources
|
abort
| Event
| Fired at the Window when the download was aborted by the user
|
afterprint
| Event
| Fired at the Window after printing
|
beforeprint
| Event
| Fired at the Window before printing
|
beforeunload
| BeforeUnloadEvent
| Fired at the Window when the page is about to be unloaded, in case the page would like to show a warning prompt
|
blur
| Event
| Fired at nodes losing focus |
change
| Event
| Fired at controls when the user commits a value change |
click
| Event
| Fired at an element before its activation behavior is run |
contextmenu
| Event
| Fired at elements when the user requests their context menu |
error
| Event
| Fired at elements when network and script errors occur |
focus
| Event
| Fired at nodes gaining focus |
formchange
| Event
| Fired at form controls when the user commits a value change to a control on the form |
forminput
| Event
| Fired at form controls when the user changes the value of a control on the form |
hashchange
| HashChangeEvent
| Fired at the Window when the fragment identifier part of the document's current address changes
|
input
| Event
| Fired at controls when the user changes the value |
invalid
| Event
| Fired at controls during form validation if they do not satisfy their constraints |
load
| Event
| Fired at the Window when the document has finished loading; fired at an element containing a resource (e.g. img , embed ) when its resource has finished loading
|
message
| MessageEvent
| Fired at an object when the object receives a message |
offline
| Event
| Fired at the Window when the network connections fails
|
online
| Event
| Fired at the Window when the network connections returns
|
pagehide
| PageTransitionEvent
| Fired at the Window when the page's entry in the session history stops being the current entry
|
pageshow
| PageTransitionEvent
| Fired at the Window when the page's entry in the session history becomes the current entry
|
popstate
| PopStateEvent
| Fired at the Window when the user navigates the session history
|
readystatechange
| Event
| Fired at the Document when it finishes parsing and again when all its subresources have finished loading
|
reset
| Event
| Fired at a form element when it is reset
|
show
| Event
| Fired at a menu element when it is shown as a context menu
|
submit
| Event
| Fired at a form element when it is submitted
|
unload
| Event
| Fired at the Window object when the page is going away
|
See also media element events, application cache events, and drag-and-drop events.