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
CSS
constructor  
length 
name
prototype  
supports
CSSConditionRule
conditionText  
constructor  
length   
name  
prototype 
CSSGroupingRule
constructor  
cssRules  
deleteRule  
insertRule  
length   
name  
prototype 
CSSMediaRule
constructor 
length  
media
name 
prototype
CSSRule
constructor 
length  
name 
prototype
SUPPORTS_RULE
CSSSupportsRule
constructor  
length   
name  
prototype