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
DedicatedWorkerGlobalScope
@@toStringTag    
arguments    
caller    
onmessage    
ServiceWorker
@@toStringTag   
arguments   
caller   
name
onerror
SharedWorker
@@toStringTag   
arguments   
caller   
constructor  
length  
name  
onerror  
port  
prototype  
SharedWorkerGlobalScope
@@toStringTag    
applicationCache    
arguments    
caller    
name    
onconnect    
Worker
@@toStringTag   
arguments   
caller   
constructor
length
name
onerror
onmessage
prototype
terminate
WorkerGlobalScope
@@toStringTag    
arguments    
caller    
close    
location    
name    
navigator    
onerror    
onlanguagechange    
onoffline    
ononline    
self    
WorkerLocation
@@toStringTag    
arguments    
caller    
name    
WorkerNavigator
@@toStringTag    
arguments    
caller    
name