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
CSSFontFaceRule
constructor 
family    
featureSettings    
length  
name 
prototype
src    
stretch    
style
unicodeRange    
variant    
weight    
CSSFontFeatureValuesMap
constructor    
length    
name    
prototype    
set    
CSSFontFeatureValuesRule
annotation    
characterVariant    
constructor    
fontFamily   
length    
name    
ornaments    
prototype   
styleset    
stylistic    
swash    
CSSRule
constructor 
FONT_FEATURE_VALUES_RULE   
length  
name 
prototype
CSSStyleDeclaration
constructor
font
fontFamily
font-family   
fontFeatureSettings
font-feature-settings   
fontKerning  
font-kerning   
fontLanguageOverride   
font-language-override   
fontSize
font-size   
fontSizeAdjust 
font-size-adjust   
fontStretch
font-stretch   
fontStyle
font-style   
fontSynthesis  
font-synthesis   
fontVariant
font-variant   
fontVariantAlternates  
font-variant-alternates   
fontVariantCaps 
font-variant-caps   
fontVariantEastAsian  
font-variant-east-asian   
fontVariantLigatures 
font-variant-ligatures   
fontVariantNumeric 
font-variant-numeric   
fontVariantPosition  
font-variant-position   
fontWeight
font-weight   
name
prototype