diff --git a/README.md b/README.md
index 657a5fdb..3a5a1e9a 100644
--- a/README.md
+++ b/README.md
@@ -22,6 +22,9 @@ There's a top-level directory for each broad area covered: for example, "api",
 "css", "svg". Inside each of these directories is one or more
 JSON files containing the data.
 
+### api
+Contains data about Web APIs:
+* API inheritance (interface inheritance and mixin implementations)
 
 ### css
  Contains data about:
diff --git a/api/index.js b/api/index.js
new file mode 100644
index 00000000..4c1ec9b6
--- /dev/null
+++ b/api/index.js
@@ -0,0 +1,3 @@
+module.exports = {
+  inheritance: require('./inheritance'),
+}
diff --git a/api/inheritance.json b/api/inheritance.json
new file mode 100644
index 00000000..aa33db73
--- /dev/null
+++ b/api/inheritance.json
@@ -0,0 +1,2509 @@
+{
+  "SVGSymbolElement": {
+    "inherits": "SVGElement",
+    "implements": [
+      "SVGFitToViewBox",
+      "SVGTests"
+    ]
+  },
+  "TVChannel": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "SVGPolygonElement": {
+    "inherits": "SVGGeometryElement",
+    "implements": [
+      "SVGAnimatedPoints"
+    ]
+  },
+  "HTMLDataElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "MozCdmaIccInfo": {
+    "inherits": "MozIccInfo",
+    "implements": []
+  },
+  "TreeBoxObject": {
+    "inherits": "BoxObject",
+    "implements": []
+  },
+  "CSSStyleDeclaration": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "Selection": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "XULElement": {
+    "inherits": "Element",
+    "implements": [
+      "GlobalEventHandlers",
+      "TouchEventHandlers",
+      "MozFrameLoaderOwner",
+      "OnErrorEventHandlerForNodes"
+    ]
+  },
+  "XMLHttpRequestUpload": {
+    "inherits": "XMLHttpRequestEventTarget",
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "WindowRoot": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "BrowserElement": {
+    "inherits": null,
+    "implements": [
+      "BrowserElementCommon",
+      "BrowserElementPrivileged"
+    ]
+  },
+  "IDBTransaction": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "TVTuner": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "ScrollViewChangeEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "SVGPathSegCurvetoCubicSmoothAbs": {
+    "inherits": "SVGPathSeg",
+    "implements": []
+  },
+  "CameraControl": {
+    "inherits": "MediaStream",
+    "implements": []
+  },
+  "SVGFEMorphologyElement": {
+    "inherits": "SVGElement",
+    "implements": [
+      "SVGFilterPrimitiveStandardAttributes"
+    ]
+  },
+  "FetchEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "DeviceOrientationEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "HTMLBRElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "MozWifiConnectionInfoEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "BroadcastChannel": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "IDBDatabase": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "HTMLFormControlsCollection": {
+    "inherits": "HTMLCollection",
+    "implements": []
+  },
+  "WebSocket": {
+    "inherits": "EventTarget",
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "SVGDescElement": {
+    "inherits": "SVGElement",
+    "implements": []
+  },
+  "SVGCircleElement": {
+    "inherits": "SVGGeometryElement",
+    "implements": []
+  },
+  "SVGCursorElement": {
+    "inherits": "SVGElement",
+    "implements": [
+      "SVGURIReference"
+    ]
+  },
+  "DOMDownload": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "SVGPathSegArcAbs": {
+    "inherits": "SVGPathSeg",
+    "implements": []
+  },
+  "ArchiveRequest": {
+    "inherits": "DOMRequest",
+    "implements": []
+  },
+  "SharedWorkerGlobalScope": {
+    "inherits": "WorkerGlobalScope",
+    "implements": []
+  },
+  "Exception": {
+    "inherits": null,
+    "implements": [
+      "ExceptionMembers"
+    ]
+  },
+  "BluetoothAdapterEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "HTMLParagraphElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "AudioDestinationNode": {
+    "inherits": "AudioNode",
+    "implements": []
+  },
+  "ProcessingInstruction": {
+    "inherits": "CharacterData",
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "BeforeUnloadEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "PseudoElement": {
+    "inherits": null,
+    "implements": [
+      "GeometryUtils"
+    ]
+  },
+  "NetworkInformation": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "MutationObserver": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "NodeList": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "CloseEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "HTMLAreaElement": {
+    "inherits": "HTMLElement",
+    "implements": [
+      "HTMLHyperlinkElementUtils",
+      "URLUtilsSearchParams"
+    ]
+  },
+  "HTMLLegendElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "SVGMetadataElement": {
+    "inherits": "SVGElement",
+    "implements": []
+  },
+  "SVGPathSegList": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "SVGForeignObjectElement": {
+    "inherits": "SVGGraphicsElement",
+    "implements": []
+  },
+  "SVGPatternElement": {
+    "inherits": "SVGElement",
+    "implements": [
+      "SVGFitToViewBox",
+      "SVGURIReference",
+      "SVGUnitTypes"
+    ]
+  },
+  "Performance": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "HTMLElement": {
+    "inherits": "Element",
+    "implements": [
+      "GlobalEventHandlers",
+      "TouchEventHandlers",
+      "OnErrorEventHandlerForNodes"
+    ]
+  },
+  "HTMLHeadElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "MozIcc": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "UDPSocket": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "DocumentType": {
+    "inherits": "Node",
+    "implements": [
+      "ChildNode",
+      "LegacyQueryInterface"
+    ]
+  },
+  "SVGStopElement": {
+    "inherits": "SVGElement",
+    "implements": []
+  },
+  "ImageDocument": {
+    "inherits": "HTMLDocument",
+    "implements": []
+  },
+  "SVGElement": {
+    "inherits": "Element",
+    "implements": [
+      "GlobalEventHandlers",
+      "TouchEventHandlers",
+      "OnErrorEventHandlerForNodes"
+    ]
+  },
+  "GamepadEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "HTMLTableElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "PerformanceMark": {
+    "inherits": "PerformanceEntry",
+    "implements": []
+  },
+  "InstallEvent": {
+    "inherits": "ExtendableEvent",
+    "implements": []
+  },
+  "FocusEvent": {
+    "inherits": "UIEvent",
+    "implements": []
+  },
+  "OscillatorNode": {
+    "inherits": "AudioNode",
+    "implements": [
+      "AudioNodePassThrough"
+    ]
+  },
+  "PluginCrashedEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "SVGPathSegLinetoVerticalRel": {
+    "inherits": "SVGPathSeg",
+    "implements": []
+  },
+  "DocumentFragment": {
+    "inherits": "Node",
+    "implements": [
+      "ParentNode",
+      "LegacyQueryInterface"
+    ]
+  },
+  "OfflineAudioCompletionEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "SVGPoint": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "HTMLTitleElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "Window": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface",
+      "GlobalEventHandlers",
+      "WindowEventHandlers",
+      "GlobalCrypto",
+      "SpeechSynthesisGetter",
+      "WindowModal",
+      "TouchEventHandlers",
+      "OnErrorEventHandlerForWindow",
+      "ChromeWindow",
+      "WindowOrWorkerGlobalScope"
+    ]
+  },
+  "WindowClient": {
+    "inherits": "Client",
+    "implements": []
+  },
+  "ErrorEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "MessageEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "SVGPathSegCurvetoQuadraticAbs": {
+    "inherits": "SVGPathSeg",
+    "implements": []
+  },
+  "AudioNode": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "MediaDevices": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "CanvasCaptureMediaStream": {
+    "inherits": "MediaStream",
+    "implements": []
+  },
+  "DynamicsCompressorNode": {
+    "inherits": "AudioNode",
+    "implements": [
+      "AudioNodePassThrough"
+    ]
+  },
+  "SVGSVGElement": {
+    "inherits": "SVGGraphicsElement",
+    "implements": [
+      "SVGFitToViewBox",
+      "SVGZoomAndPan"
+    ]
+  },
+  "File": {
+    "inherits": "Blob",
+    "implements": []
+  },
+  "SVGAnimationElement": {
+    "inherits": "SVGElement",
+    "implements": [
+      "SVGTests"
+    ]
+  },
+  "BluetoothPairingEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "ShadowRoot": {
+    "inherits": "DocumentFragment",
+    "implements": []
+  },
+  "ExtendableEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "SVGFEOffsetElement": {
+    "inherits": "SVGElement",
+    "implements": [
+      "SVGFilterPrimitiveStandardAttributes"
+    ]
+  },
+  "DesktopNotification": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "SVGGradientElement": {
+    "inherits": "SVGElement",
+    "implements": [
+      "SVGURIReference",
+      "SVGUnitTypes"
+    ]
+  },
+  "HTMLMetaElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "Text": {
+    "inherits": "CharacterData",
+    "implements": [
+      "LegacyQueryInterface",
+      "GeometryUtils"
+    ]
+  },
+  "DOMApplication": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "InstallTrigger": {
+    "inherits": null,
+    "implements": []
+  },
+  "MutationEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "HTMLLabelElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "SVGGeometryElement": {
+    "inherits": "SVGGraphicsElement",
+    "implements": []
+  },
+  "SVGPathElement": {
+    "inherits": "SVGGeometryElement",
+    "implements": [
+      "SVGAnimatedPathData"
+    ]
+  },
+  "HTMLTemplateElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "SVGAnimatedInteger": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "SVGFEDisplacementMapElement": {
+    "inherits": "SVGElement",
+    "implements": [
+      "SVGFilterPrimitiveStandardAttributes"
+    ]
+  },
+  "SVGPathSegMovetoAbs": {
+    "inherits": "SVGPathSeg",
+    "implements": []
+  },
+  "XULCommandEvent": {
+    "inherits": "UIEvent",
+    "implements": []
+  },
+  "Crypto": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "Response": {
+    "inherits": null,
+    "implements": [
+      "Body"
+    ]
+  },
+  "SVGZoomEvent": {
+    "inherits": "UIEvent",
+    "implements": []
+  },
+  "SVGLinearGradientElement": {
+    "inherits": "SVGGradientElement",
+    "implements": []
+  },
+  "WebGLContextEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "WebGL2RenderingContext": {
+    "inherits": "WebGLRenderingContext",
+    "implements": []
+  },
+  "SVGFEDistantLightElement": {
+    "inherits": "SVGElement",
+    "implements": []
+  },
+  "MouseScrollEvent": {
+    "inherits": "MouseEvent",
+    "implements": []
+  },
+  "DOMStringMap": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "SVGAnimateMotionElement": {
+    "inherits": "SVGAnimationElement",
+    "implements": []
+  },
+  "ChannelSplitterNode": {
+    "inherits": "AudioNode",
+    "implements": []
+  },
+  "ListBoxObject": {
+    "inherits": "BoxObject",
+    "implements": []
+  },
+  "MozGsmIccInfo": {
+    "inherits": "MozIccInfo",
+    "implements": []
+  },
+  "TrackEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "SVGStyleElement": {
+    "inherits": "SVGElement",
+    "implements": []
+  },
+  "PresentationDeviceInfoManager": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "NodeIterator": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "SVGAltGlyphElement": {
+    "inherits": "SVGTextPositioningElement",
+    "implements": [
+      "SVGURIReference"
+    ]
+  },
+  "SVGFEGaussianBlurElement": {
+    "inherits": "SVGElement",
+    "implements": [
+      "SVGFilterPrimitiveStandardAttributes"
+    ]
+  },
+  "MozMobileConnection": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "SVGFEConvolveMatrixElement": {
+    "inherits": "SVGElement",
+    "implements": [
+      "SVGFilterPrimitiveStandardAttributes"
+    ]
+  },
+  "FileList": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "Document": {
+    "inherits": "Node",
+    "implements": [
+      "XPathEvaluator",
+      "GlobalEventHandlers",
+      "TouchEventHandlers",
+      "ParentNode",
+      "OnErrorEventHandlerForNodes",
+      "GeometryUtils",
+      "FontFaceSource",
+      "LegacyQueryInterface"
+    ]
+  },
+  "SVGAnimatedEnumeration": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "MozStkCommandEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "HTMLFontElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "SharedWorker": {
+    "inherits": "EventTarget",
+    "implements": [
+      "AbstractWorker"
+    ]
+  },
+  "RecordErrorEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "DelayNode": {
+    "inherits": "AudioNode",
+    "implements": [
+      "AudioNodePassThrough"
+    ]
+  },
+  "SVGPathSegCurvetoCubicAbs": {
+    "inherits": "SVGPathSeg",
+    "implements": []
+  },
+  "BluetoothGatt": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "CameraClosedEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "SVGMaskElement": {
+    "inherits": "SVGElement",
+    "implements": [
+      "SVGUnitTypes"
+    ]
+  },
+  "ContactManager": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "ProgressEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "ServiceWorker": {
+    "inherits": "EventTarget",
+    "implements": [
+      "AbstractWorker"
+    ]
+  },
+  "SVGPathSegLinetoHorizontalAbs": {
+    "inherits": "SVGPathSeg",
+    "implements": []
+  },
+  "CharacterData": {
+    "inherits": "Node",
+    "implements": [
+      "ChildNode",
+      "NonDocumentTypeChildNode"
+    ]
+  },
+  "KeyboardEvent": {
+    "inherits": "UIEvent",
+    "implements": [
+      "KeyEvent"
+    ]
+  },
+  "TelephonyCall": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "WorkerNavigator": {
+    "inherits": null,
+    "implements": [
+      "NavigatorID",
+      "NavigatorLanguage",
+      "NavigatorOnLine",
+      "NavigatorDataStore"
+    ]
+  },
+  "PopupBlockedEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "MediaElementAudioSourceNode": {
+    "inherits": "AudioNode",
+    "implements": [
+      "AudioNodePassThrough"
+    ]
+  },
+  "HTMLFrameSetElement": {
+    "inherits": "HTMLElement",
+    "implements": [
+      "WindowEventHandlers"
+    ]
+  },
+  "BluetoothManager": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "SVGFilterElement": {
+    "inherits": "SVGElement",
+    "implements": [
+      "SVGURIReference",
+      "SVGUnitTypes"
+    ]
+  },
+  "SVGClipPathElement": {
+    "inherits": "SVGElement",
+    "implements": [
+      "SVGUnitTypes"
+    ]
+  },
+  "SVGLineElement": {
+    "inherits": "SVGGeometryElement",
+    "implements": []
+  },
+  "SpeechRecognitionEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "SVGPointList": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "SVGFEDropShadowElement": {
+    "inherits": "SVGElement",
+    "implements": [
+      "SVGFilterPrimitiveStandardAttributes"
+    ]
+  },
+  "HTMLQuoteElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "SVGFESpotLightElement": {
+    "inherits": "SVGElement",
+    "implements": []
+  },
+  "ServiceWorkerContainer": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "HTMLContentElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "HTMLOutputElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "DataStoreChangeEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "Plugin": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "SVGStringList": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "SVGRectElement": {
+    "inherits": "SVGGeometryElement",
+    "implements": []
+  },
+  "HTMLUListElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "History": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "SpeechRecognition": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "AnimationEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "TouchEvent": {
+    "inherits": "UIEvent",
+    "implements": []
+  },
+  "IDBMutableFile": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "Range": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "CameraStateChangeEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "MediaStreamAudioDestinationNode": {
+    "inherits": "AudioNode",
+    "implements": []
+  },
+  "HTMLMenuItemElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "MediaSource": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "PannerNode": {
+    "inherits": "AudioNode",
+    "implements": [
+      "AudioNodePassThrough"
+    ]
+  },
+  "MozNFCPeerEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "GamepadButtonEvent": {
+    "inherits": "GamepadEvent",
+    "implements": []
+  },
+  "IDBRequest": {
+    "inherits": "EventTarget",
+    "implements": []
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+  "HTMLAudioElement": {
+    "inherits": "HTMLMediaElement",
+    "implements": []
+  },
+  "SVGViewElement": {
+    "inherits": "SVGElement",
+    "implements": [
+      "SVGFitToViewBox",
+      "SVGZoomAndPan"
+    ]
+  },
+  "SVGTextPositioningElement": {
+    "inherits": "SVGTextContentElement",
+    "implements": []
+  },
+  "SVGTextContentElement": {
+    "inherits": "SVGGraphicsElement",
+    "implements": []
+  },
+  "Location": {
+    "inherits": null,
+    "implements": []
+  },
+  "FontFaceSet": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "TVCurrentSourceChangedEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "Touch": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "MozSettingsEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "BluetoothAdapter": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "SVGPathSegMovetoRel": {
+    "inherits": "SVGPathSeg",
+    "implements": []
+  },
+  "RTCDataChannelEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "HTMLModElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "BluetoothStatusChangedEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "SpeechSynthesisEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "SVGTitleElement": {
+    "inherits": "SVGElement",
+    "implements": []
+  },
+  "DOMApplicationsManager": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "SettingsManager": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "MenuBoxObject": {
+    "inherits": "BoxObject",
+    "implements": []
+  },
+  "Screen": {
+    "inherits": "EventTarget",
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "MozClirModeEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "HTMLEmbedElement": {
+    "inherits": "HTMLElement",
+    "implements": [
+      "MozImageLoadingContent",
+      "MozFrameLoaderOwner",
+      "MozObjectLoadingContent"
+    ]
+  },
+  "OfflineResourceList": {
+    "inherits": "EventTarget",
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "SVGPathSegClosePath": {
+    "inherits": "SVGPathSeg",
+    "implements": []
+  },
+  "ConvolverNode": {
+    "inherits": "AudioNode",
+    "implements": [
+      "AudioNodePassThrough"
+    ]
+  },
+  "BluetoothDiscoveryStateChangedEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "PropertyNodeList": {
+    "inherits": "NodeList",
+    "implements": []
+  },
+  "HTMLStyleElement": {
+    "inherits": "HTMLElement",
+    "implements": [
+      "LinkStyle"
+    ]
+  },
+  "DataStore": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "CDATASection": {
+    "inherits": "Text",
+    "implements": []
+  },
+  "SourceBufferList": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "StorageEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "MozEmergencyCbModeEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "PluginArray": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "SVGFETurbulenceElement": {
+    "inherits": "SVGElement",
+    "implements": [
+      "SVGFilterPrimitiveStandardAttributes"
+    ]
+  },
+  "MozInterAppMessagePort": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "SVGNumberList": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "MozWifiStatusChangeEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "SVGFETileElement": {
+    "inherits": "SVGElement",
+    "implements": [
+      "SVGFilterPrimitiveStandardAttributes"
+    ]
+  },
+  "CaretPosition": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "SVGPathSegCurvetoCubicRel": {
+    "inherits": "SVGPathSeg",
+    "implements": []
+  },
+  "Request": {
+    "inherits": null,
+    "implements": [
+      "Body"
+    ]
+  },
+  "SVGAnimatedNumber": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "SVGFEDiffuseLightingElement": {
+    "inherits": "SVGElement",
+    "implements": [
+      "SVGFilterPrimitiveStandardAttributes"
+    ]
+  },
+  "TreeWalker": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "BarProp": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "HTMLLinkElement": {
+    "inherits": "HTMLElement",
+    "implements": [
+      "LinkStyle"
+    ]
+  },
+  "SVGUseElement": {
+    "inherits": "SVGGraphicsElement",
+    "implements": [
+      "SVGURIReference"
+    ]
+  },
+  "HTMLCanvasElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "SVGPathSegLinetoHorizontalRel": {
+    "inherits": "SVGPathSeg",
+    "implements": []
+  },
+  "HTMLParamElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "SourceBuffer": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "HashChangeEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "PointerEvent": {
+    "inherits": "MouseEvent",
+    "implements": []
+  },
+  "FileReader": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "Comment": {
+    "inherits": "CharacterData",
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "MozMmsEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "BatteryManager": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "DOMMatrix": {
+    "inherits": "DOMMatrixReadOnly",
+    "implements": []
+  },
+  "SVGSwitchElement": {
+    "inherits": "SVGGraphicsElement",
+    "implements": []
+  },
+  "SVGFEImageElement": {
+    "inherits": "SVGElement",
+    "implements": [
+      "SVGFilterPrimitiveStandardAttributes",
+      "SVGURIReference"
+    ]
+  },
+  "HTMLScriptElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "HTMLPictureElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "ServiceWorkerRegistration": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "HTMLVideoElement": {
+    "inherits": "HTMLMediaElement",
+    "implements": []
+  },
+  "IDBFileRequest": {
+    "inherits": "DOMRequest",
+    "implements": []
+  },
+  "SVGAnimatedNumberList": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "RTCPeerConnectionIceEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "PaintRequest": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "HTMLMenuElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "EngineeringMode": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "BluetoothDeviceEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "DeviceLightEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "GainNode": {
+    "inherits": "AudioNode",
+    "implements": [
+      "AudioNodePassThrough"
+    ]
+  },
+  "MozApplicationEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "SVGFEFuncAElement": {
+    "inherits": "SVGComponentTransferFunctionElement",
+    "implements": []
+  },
+  "StyleSheetApplicableStateChangeEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "TVEITBroadcastedEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "UndoManager": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "XMLSerializer": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "SVGPathSegCurvetoQuadraticSmoothAbs": {
+    "inherits": "SVGPathSeg",
+    "implements": []
+  },
+  "WaveShaperNode": {
+    "inherits": "AudioNode",
+    "implements": [
+      "AudioNodePassThrough"
+    ]
+  },
+  "VideoStreamTrack": {
+    "inherits": "MediaStreamTrack",
+    "implements": []
+  },
+  "DOMImplementation": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "HTMLTableCaptionElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "SVGMarkerElement": {
+    "inherits": "SVGElement",
+    "implements": [
+      "SVGFitToViewBox"
+    ]
+  },
+  "MozWifiManager": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "HTMLPreElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "Rect": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "DeviceStorageChangeEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "DOMMobileMessageError": {
+    "inherits": "DOMError",
+    "implements": []
+  },
+  "CSSFontFaceLoadEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "HTMLHeadingElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "SVGRadialGradientElement": {
+    "inherits": "SVGGradientElement",
+    "implements": []
+  },
+  "DeviceProximityEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "EventSource": {
+    "inherits": "EventTarget",
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "StereoPannerNode": {
+    "inherits": "AudioNode",
+    "implements": [
+      "AudioNodePassThrough"
+    ]
+  },
+  "AutocompleteErrorEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "HTMLFrameElement": {
+    "inherits": "HTMLElement",
+    "implements": [
+      "MozFrameLoaderOwner"
+    ]
+  },
+  "HTMLOListElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "RadioNodeList": {
+    "inherits": "NodeList",
+    "implements": []
+  },
+  "StyleSheetChangeEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "TextTrack": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "HTMLBaseElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "AnalyserNode": {
+    "inherits": "AudioNode",
+    "implements": [
+      "AudioNodePassThrough"
+    ]
+  },
+  "MediaStream": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "HTMLTableRowElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "UserProximityEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "DragEvent": {
+    "inherits": "MouseEvent",
+    "implements": []
+  },
+  "HTMLHRElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "BiquadFilterNode": {
+    "inherits": "AudioNode",
+    "implements": [
+      "AudioNodePassThrough"
+    ]
+  },
+  "ScriptProcessorNode": {
+    "inherits": "AudioNode",
+    "implements": [
+      "AudioNodePassThrough"
+    ]
+  },
+  "MimeTypeArray": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "HTMLIFrameElement": {
+    "inherits": "HTMLElement",
+    "implements": [
+      "MozFrameLoaderOwner",
+      "BrowserElement"
+    ]
+  },
+  "FormData": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "MediaKeyMessageEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "MozNFC": {
+    "inherits": "EventTarget",
+    "implements": [
+      "MozNFCManager"
+    ]
+  },
+  "HTMLLIElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "DOMTokenList": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "XMLStylesheetProcessingInstruction": {
+    "inherits": "ProcessingInstruction",
+    "implements": []
+  },
+  "MozSettingsTransactionEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "SVGFEComponentTransferElement": {
+    "inherits": "SVGElement",
+    "implements": [
+      "SVGFilterPrimitiveStandardAttributes"
+    ]
+  },
+  "MozSmsEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "HTMLDirectoryElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "MediaEncryptedEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "CFStateChangeEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "HTMLTrackElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "SVGPathSegLinetoRel": {
+    "inherits": "SVGPathSeg",
+    "implements": []
+  },
+  "WheelEvent": {
+    "inherits": "MouseEvent",
+    "implements": []
+  },
+  "Node": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "MozWifiStationInfoEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "SVGRect": {
+    "inherits": null,
+    "implements": [
+      "LegacyQueryInterface"
+    ]
+  },
+  "DOMSettableTokenList": {
+    "inherits": "DOMTokenList",
+    "implements": []
+  },
+  "HTMLImageElement": {
+    "inherits": "HTMLElement",
+    "implements": [
+      "MozImageLoadingContent"
+    ]
+  },
+  "DOMRequest": {
+    "inherits": "EventTarget",
+    "implements": [
+      "DOMRequestShared"
+    ]
+  },
+  "HTMLFormElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "SVGGraphicsElement": {
+    "inherits": "SVGElement",
+    "implements": [
+      "SVGTests"
+    ]
+  },
+  "DeviceMotionEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "CompositionEvent": {
+    "inherits": "UIEvent",
+    "implements": []
+  },
+  "SpeechRecognitionError": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "CallGroupErrorEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "MozInputMethod": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "UDPMessageEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "MediaStreamEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "HTMLTextAreaElement": {
+    "inherits": "HTMLElement",
+    "implements": []
+  },
+  "XMLHttpRequestEventTarget": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "HTMLAnchorElement": {
+    "inherits": "HTMLElement",
+    "implements": [
+      "HTMLHyperlinkElementUtils",
+      "URLUtilsSearchParams"
+    ]
+  },
+  "HTMLPropertiesCollection": {
+    "inherits": "HTMLCollection",
+    "implements": []
+  },
+  "SVGFEFuncGElement": {
+    "inherits": "SVGComponentTransferFunctionElement",
+    "implements": []
+  },
+  "ImageCaptureErrorEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "SVGSetElement": {
+    "inherits": "SVGAnimationElement",
+    "implements": []
+  },
+  "ChannelMergerNode": {
+    "inherits": "AudioNode",
+    "implements": []
+  },
+  "SyncEvent": {
+    "inherits": "ExtendableEvent",
+    "implements": []
+  },
+  "OffscreenCanvas": {
+    "inherits": "EventTarget",
+    "implements": []
+  },
+  "PromiseRejectionEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "CSSCounterStyleRule": {
+    "inherits": "CSSRule",
+    "implements": []
+  },
+  "PerformanceLongTaskTiming": {
+    "inherits": "PerformanceEntry",
+    "implements": []
+  },
+  "TaskAttributionTiming": {
+    "inherits": "PerformanceEntry",
+    "implements": []
+  },
+  "BeforeInstallPromptEvent": {
+    "inherits": "Event",
+    "implements": []
+  },
+  "PerformanceNavigationTiming": {
+    "inherits": "PerformanceEntry",
+    "implements": []
+  },
+  "PerformancePaintTiming": {
+    "inherits": "PerformanceEntry",
+    "implements": []
+  }
+}
diff --git a/api/inheritance.md b/api/inheritance.md
new file mode 100644
index 00000000..5927b0ea
--- /dev/null
+++ b/api/inheritance.md
@@ -0,0 +1,25 @@
+# Inheritance
+
+[data](https://github.com/mdn/data/blob/master/api/inheritance.json) |
+[schema](https://github.com/mdn/data/blob/master/css/inheritance.schema.json)
+
+Interfaces of Web APIs can inherit from other interfaces or implement [mixins](https://developer.mozilla.org/en-US/docs/Glossary/Mixin). For each interface, this data informs about the inherited (parent) interface and the implemented mixins.
+
+## Structure for inheritance data of a specific name
+
+The overall inheritance data is an object with one property per interface.
+Each interface entry looks like the following example (E.g. for the DocumentFragment interface).
+
+```json
+"DocumentFragment": {
+  "inherits": "Node",
+  "implements": [
+    "ParentNode",
+    "LegacyQueryInterface"
+  ]
+}
+```
+
+The 2 properties are both required.
+* `inherits` (a string or null): the name of the interface it inherits properties and methods from. If null, it means it doesn't inherit from any interface.
+* `implements` (array of strings): the list of mixins the interface implements. The array can be empty.
diff --git a/api/inheritance.schema.json b/api/inheritance.schema.json
new file mode 100644
index 00000000..706abbc1
--- /dev/null
+++ b/api/inheritance.schema.json
@@ -0,0 +1,31 @@
+{
+  "type": "object",
+  "additionalProperties": {
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {
+      "inherits": {
+        "oneOf": [
+          {
+            "type": "null"
+          },
+          {
+            "type": "string",
+            "minLength": 1
+          }
+        ]
+      },
+      "implements": {
+        "minItems": 0,
+        "uniqueItems": true,
+        "items": {
+          "type": "string"
+        }
+      }
+    },
+    "required": [
+      "inherits",
+      "implements"
+    ]
+  }
+}
diff --git a/index.js b/index.js
index 8552ad9b..3b0f09ff 100644
--- a/index.js
+++ b/index.js
@@ -1,4 +1,5 @@
 module.exports = {
+  api: require('./api'),
   css: require('./css'),
   l10n: require('./l10n'),
 }
diff --git a/package.json b/package.json
index 210f5b43..776d06f7 100644
--- a/package.json
+++ b/package.json
@@ -4,6 +4,7 @@
   "description": "Open Web data by the Mozilla Developer Network",
   "main": "index.js",
   "files": [
+    "api/*.json",
     "css/*.json",
     "l10n/*.json"
   ],
diff --git a/test/lint.js b/test/lint.js
index df3e9027..782e39db 100644
--- a/test/lint.js
+++ b/test/lint.js
@@ -2,7 +2,7 @@ var fs = require('fs');
 var path = require('path');
 var Ajv = require('ajv');
 var ajv = new Ajv({ $data: true, allErrors: true });
-var dictPaths = ['css', 'l10n'];
+var dictPaths = ['api', 'css', 'l10n'];
 var hasErrors = false;
 
 ajv.addKeyword('property-reference', {
@@ -38,7 +38,7 @@ function jsonDiff(actual, expected) {
 function checkStyle(filename) {
   var actual = fs.readFileSync(filename, 'utf-8').trim();
   var expected = JSON.stringify(JSON.parse(actual), null, 2);
-  
+
   if (actual === expected) {
     console.log('  Style – OK');
   } else {