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
Document
@@toStringTag   
@@unscopables
all 
anchors 
applets  
arguments   
body
caller   
captureEvents 
clear 
close 
constructor
cookie 
currentScript
defaultView
designMode 
dir
domain 
embeds 
execCommand 
forms 
getElementsByName
hasFocus
head 
images 
lastModified
length
links 
location
name
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
onreadystatechange
onreset
onresize 
onscroll
onseeked
onseeking
onselect
onshow   
onstalled
onsubmit
onsuspend
ontimeupdate
ontoggle 
onvolumechange
onwaiting
onwheel
plugins 
prototype
queryCommandEnabled 
queryCommandIndeterm 
queryCommandState 
queryCommandSupported 
queryCommandValue 
readyState
referrer
releaseEvents 
scripts 
title
write 
writeln 
DragEvent
@@toStringTag   
arguments   
caller   
constructor 
dataTransfer 
length 
name 
prototype 
ErrorEvent
@@toStringTag   
arguments   
caller   
colno
constructor
error
length
lineno
message
name
prototype
HTMLAllCollection
@@iterator 
@@toStringTag   
arguments   
caller   
item
length
name
namedItem
HTMLAnchorElement
@@toStringTag   
arguments   
caller   
charset
constructor
coords
download
hash
host
hostname
href
hreflang
length
name
origin
password 
pathname
port
protocol
prototype
referrerPolicy  
rel
relList 
rev
search
shape
target
text
type
username 
HTMLAppletElement
@@toStringTag    
_object    
align   
alt   
archive   
arguments    
caller    
code   
codeBase   
height   
hspace   
name   
vspace   
width   
HTMLAreaElement
@@toStringTag   
alt
arguments   
caller   
constructor
coords
download
hash
host
hostname
href
hreflang    
length
name
noHref
origin
password 
pathname
port
protocol
prototype
referrerPolicy  
rel
relList 
search
shape
target
type    
username 
HTMLAudioElement
@@toStringTag   
arguments   
caller   
constructor
length
name
prototype
HTMLBRElement
@@toStringTag   
arguments   
caller   
clear
constructor
length
name
prototype
HTMLBaseElement
@@toStringTag   
arguments   
caller   
constructor
length
name
prototype
target