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
HTMLBodyElement
@@toStringTag   
arguments   
background
caller   
constructor
length
name
onafterprint 
onbeforeprint 
onbeforeunload
onhashchange
onlanguagechange 
onmessage
onoffline
ononline
onpagehide
onpageshow
onpopstate
onrejectionhandled   
onstorage
onunhandledrejection   
onunload
prototype
HTMLButtonElement
@@toStringTag   
arguments   
autofocus
caller   
checkValidity
constructor
disabled
form
formEnctype
formMethod
formNoValidate
formTarget
labels 
length
name
prototype
reportValidity
setCustomValidity
type
validationMessage
validity
value
willValidate
HTMLCanvasElement
@@toStringTag   
arguments   
caller   
constructor
height
length
name
probablySupportsContext    
prototype
width
HTMLDListElement
@@toStringTag   
arguments   
caller   
compact
constructor
length
name
prototype
HTMLDataElement
@@toStringTag   
arguments   
caller   
constructor
length
name
prototype
value
HTMLDataListElement
@@toStringTag   
arguments   
caller   
constructor 
length 
name 
options 
prototype 
HTMLDetailsElement
@@toStringTag   
arguments   
caller   
constructor 
length 
name 
open 
prototype 
HTMLDialogElement
@@toStringTag   
arguments   
caller   
close  
constructor  
length  
name  
open  
prototype  
returnValue  
HTMLDirectoryElement
@@toStringTag   
arguments   
caller   
compact
constructor
length
name
prototype
HTMLDivElement
@@toStringTag   
align
arguments   
caller   
constructor
length
name
prototype