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
MessageChannel
@@toStringTag   
arguments   
caller   
constructor
length
name
port1
port2
prototype
MessageEvent
@@toStringTag   
arguments   
caller   
constructor
data
initMessageEvent
lastEventId
length
name
origin
ports
prototype
source
MessagePort
@@toStringTag   
arguments   
caller   
close
name
onmessage
postMessage
start