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
CSSStyleDeclaration
@@iterator 
@@toStringTag   
arguments   
breakAfter 
break-after    
breakBefore 
break-before    
breakInside 
break-inside    
caller   
flowFrom    
flow-from    
flowInto    
flow-into    
name
regionFragment    
region-fragment    
Document
@@toStringTag   
@@unscopables
arguments   
caller   
constructor
length
name
namedFlows    
prototype
Element
@@toStringTag   
@@unscopables
arguments   
caller   
getRegionFlowRanges    
name
regionOverset    
NamedFlow
@@toStringTag    
arguments    
caller    
firstEmptyRegionIndex    
getContent    
getRegions    
getRegionsByContent    
name    
overset    
NamedFlowMap
@@toStringTag    
arguments    
caller    
delete    
get    
has    
name    
set