API Catalog

Visualize and analyze the API overlap between standards specifications and type systems within browsers.

Browser information was gathered by traversing the type system within the latest available version of the top browsers. Specification data was gathered by extracting Web IDL definitions from notable web specifications. Note that an API that is shown as detected does not necessarily mean it functions per specification; where the absence of an API under an interface could be due to the browser supporting an API in a different part of the prototype chain. This data is made publicly available to help each browser vendor work toward the goal of a more interoperable web platform. For more information, visit our FAQ page.

APIs by interface

API NameSpecificationsMicrosoft EdgeGoogle ChromeMozilla FirefoxApple Safari
HTMLElement
@@toStringTag   
accessKey
arguments   
blur
caller   
click
constructor
contentEditable
dataset
dir
draggable
forceSpellCheck    
hidden
isContentEditable
lang
length
name
nonce   
onabort
onblur
oncancel   
oncanplay
oncanplaythrough
onchange
onclick
onclose  
oncopy  
oncuechange 
oncut  
ondblclick
ondrag
ondragend
ondragenter
ondragexit   
ondragleave
ondragover
ondragstart
ondrop
ondurationchange
onemptied
onended
onerror
onfocus
oninput
oninvalid
onkeydown
onkeypress
onkeyup
onload
onloadeddata
onloadedmetadata
onloadstart
onmousedown
onmouseenter
onmouseleave
onmousemove
onmouseout
onmouseover
onmouseup
onpaste  
onpause
onplay
onplaying
onprogress
onratechange
onreset
onresize 
onscroll
onseeked
onseeking
onselect
onshow   
onstalled
onsubmit
onsuspend
ontimeupdate
ontoggle 
onvolumechange
onwaiting
onwheel
prototype
spellcheck
tabIndex
title
translate  
HTMLEmbedElement
@@toStringTag   
align 
arguments   
caller   
constructor
height
length
name
prototype
type 
width
HTMLFieldSetElement
@@toStringTag   
arguments   
caller   
checkValidity
constructor
disabled
elements
form
length
name
prototype
reportValidity
setCustomValidity
type
validationMessage
validity
willValidate
HTMLFontElement
@@toStringTag   
arguments   
caller   
constructor
face
length
name
prototype
size
HTMLFormControlsCollection
@@toStringTag   
arguments   
caller   
name
namedItem
HTMLFormElement
@@iterator 
@@toStringTag   
acceptCharset
arguments   
autocomplete
caller   
checkValidity
constructor
elements
encoding
enctype
length
method
name
noValidate
prototype
reportValidity
reset
submit
target
HTMLFrameElement
@@toStringTag   
arguments   
caller   
constructor
contentDocument
contentWindow
frameBorder
length
longDesc
name
noResize
prototype
scrolling
src
HTMLFrameSetElement
@@toStringTag   
arguments   
caller   
cols
constructor
length
name
onafterprint 
onbeforeprint 
onbeforeunload
onhashchange
onlanguagechange 
onmessage
onoffline
ononline
onpagehide
onpageshow
onpopstate
onrejectionhandled   
onstorage
onunhandledrejection   
onunload
prototype
rows
HTMLHRElement
@@toStringTag   
align
arguments   
caller   
color
constructor
length
name
noShade
prototype
size
width
HTMLHeadElement
@@toStringTag   
arguments   
caller   
constructor
length
name
prototype