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
constructor    
length    
name    
onmessage    
postMessage    
prototype    
SharedWorker
constructor  
length  
name  
onerror  
port  
prototype  
SharedWorkerGlobalScope
applicationCache    
constructor    
length    
name    
onconnect    
prototype    
Worker
constructor
length 
name
onerror
onmessage
postMessage
prototype
terminate
WorkerGlobalScope
close    
constructor    
importScripts    
length    
location    
name    
navigator    
onerror    
onlanguagechange    
onoffline    
ononline    
prototype    
self    
WorkerLocation
constructor    
length    
name    
prototype    
WorkerNavigator
constructor    
length    
name    
prototype