When writing code for the Web using JavaScript, there are a great many APIs available. Below is a list of all the interfaces (that is, types of objects) that you may be able to use while developing your Web app or site.
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AbstractWorkerAnalyserNodeAnimationEventAppAppsArrayBufferViewAttrAudioBufferAudioBufferSourceNodeAudioChannelManagerAudioContextAudioDestinationNodeAudioListenerAudioNodeAudioParamAudioProcessingEvent
BatteryManagerBiquadFilterNodeBlobBlobBuilderBlobEventBluetoothAdapterBluetoothDeviceBluetoothDeviceEventBluetoothManagerBluetoothStatusChangedEvent
CacheCacheStorageCallEventCameraCapabilitiesCameraControlCameraManagerCanvasCanvasGradientCanvasImageSourceCanvasPatternCanvasRenderingContext2DCaretPositionCDATASectionChannelMergerNodeChannelSplitterNodeCharacterDataChildNodeChromeWorkerClipboardEventCloseEventCommentCompositionEventConnectionConsoleContactManagerContactsConvolverNodeCoordinatesCryptoCSSCSSConditionRuleCSSGroupingRuleCSSKeyframeRuleCSSKeyframesRuleCSSMediaRuleCSSNamespaceRuleCSSPageRuleCSSRuleCSSRuleListCSSStyleDeclarationCSSStyleRuleCSSStyleSheetCSSSupportsRuleCustomEvent
DataStoreDataStoreChangeEventDataStoreCursorDataStoreTaskDataTransferDedicatedWorkerGlobalScopeDelayNodeDeviceAccelerationDeviceLightEventDeviceMotionEventDeviceOrientationEventDeviceProximityEventDeviceRotationRateDeviceStorageDeviceStorageChangeEventDirectoryEntryDirectoryEntrySyncDirectoryReaderDirectoryReaderSyncDocumentDocumentFragmentDocumentTouchDocumentTypeDOMConfigurationDOMCursorDOMErrorDOMErrorHandlerDOMExceptionDOMHighResTimeStampDOMImplementationDOMImplementationListDOMImplementationRegistryDOMImplementationSourceDOMLocatorDOMMatrixDOMMatrixReadOnlyDOMObjectDOMParserDOMRequestDOMStringDOMStringListDOMStringMapDOMTimeStampDOMTokenListDOMUserDataDragEventDynamicsCompressorNode
ElementElementTraversalEntityEntityReferenceEntryEntrySyncErrorEventEventEventListenerEventSourceEventTargetExtendableEventExtensions
FetchEventFileFileEntryFileEntrySyncFileErrorFileExceptionFileHandleFileListFileReaderFileReaderSyncFileRequestFileSystemFileSystemSyncFMRadioFocusEventFormData
HashChangeEventHistoryHTMLAnchorElementHTMLAreaElementHTMLAudioElementHTMLBaseElementHTMLBaseFontElementHTMLBodyElementHTMLBRElementHTMLButtonElementHTMLCanvasElementHTMLCollectionHTMLDataElementHTMLDataListElementHTMLDialogElementHTMLDivElementHTMLDListElementHTMLDocumentHTMLElementHTMLEmbedElementHTMLFieldSetElementHTMLFormControlsCollectionHTMLFormElementHTMLFrameSetElementHTMLHeadElementHTMLHeadingElementHTMLHRElementHTMLHtmlElementHTMLIFrameElementHTMLImageElementHTMLInputElementHTMLIsIndexElementHTMLKeygenElementHTMLLabelElementHTMLLegendElementHTMLLIElementHTMLLinkElementHTMLMapElementHTMLMediaElementHTMLMetaElementHTMLMeterElementHTMLModElementHTMLObjectElementHTMLOListElementHTMLOptGroupElementHTMLOptionElementHTMLOptionsCollectionHTMLOutputElementHTMLParagraphElementHTMLParamElementHTMLPictureElementHTMLPreElementHTMLProgressElementHTMLQuoteElementHTMLScriptElementHTMLSelectElementHTMLSourceElementHTMLSpanElementHTMLStyleElementHTMLTableCaptionElementHTMLTableCellElementHTMLTableColElementHTMLTableDataCellElementHTMLTableElementHTMLTableHeaderCellElementHTMLTableRowElementHTMLTableSectionElementHTMLTextAreaElementHTMLTimeElementHTMLTitleElementHTMLTrackElementHTMLUListElementHTMLUnknownElementHTMLVideoElement
IDBCursorIDBCursorSyncIDBCursorWithValueIDBDatabaseIDBDatabaseExceptionIDBDatabaseSyncIDBEnvironmentIDBEnvironmentSyncIDBFactoryIDBFactorySyncIDBIndexIDBIndexSyncIDBKeyRangeIDBObjectStoreIDBObjectStoreSyncIDBOpenDBRequestIDBRequestIDBTransactionIDBTransactionSyncIDBVersionChangeEventIDBVersionChangeRequestImageDataIndexedDBInputEvent
MediaElementAudioSourceNodeMediaQueryListMediaQueryListListenerMediaRecorderMediaSourceMediaStreamMediaStreamAudioDestinationNodeMediaStreamAudioSourceNodeMediaStreamEventMediaStreamTrackMessageEventMouseEventMouseScrollEventMouseWheelEventMozActivityMozActivityOptionsMozActivityRequestHandlerMozAlarmsManagerMozContactMozContactChangeEventMozIccManagerMozMmsEventMozMmsMessageMozMobileCellInfoMozMobileCFInfoMozMobileConnectionMozMobileConnectionInfoMozMobileICCInfoMozMobileMessageManagerMozMobileMessageThreadMozMobileNetworkInfoMozNDEFRecordMozNetworkStatsMozNetworkStatsDataMozNetworkStatsManagerMozNFCMozNFCPeerMozNFCTagMozSettingsEventMozSmsEventMozSmsFilterMozSmsManagerMozSmsMessageMozSmsSegmentInfoMozTimeManagerMozVoicemailMozVoicemailEventMozVoicemailStatusMozWifiConnectionInfoEventMozWifiStatusChangeEventMutationObserver
NamedNodeMapNameListNavigatorNavigatorGeolocationNavigatorIDNavigatorLanguageNavigatorOnLineNavigatorPluginsNetworkInformationNodeNodeFilterNodeIteratorNodeListNonDocumentTypeChildNodeNotationNotificationNotifyAudioAvailableEvent
PannerNodeParentNodePath2DPerformancePerformanceNavigationPerformanceTimingPeriodicWavePermissionsPermissionSettingsPluginPluginArrayPositionPositionErrorPositionOptionsPowerManagerProcessingInstructionProgressEventPromiseResolverPushManager
RadioNodeListRandomSourceRangeRenderingContextRTCConfigurationRTCDataChannelRTCDataChannelEventRTCIdentityErrorEventRTCIdentityEventRTCPeerConnectionRTCPeerConnectionIceEventRTCSessionDescriptionRTCSessionDescriptionCallback
ScriptProcessorNodeSelectionServiceWorkerServiceWorkerClientServiceWorkerClientsServiceWorkerContainerServiceWorkerGlobalScopeServiceWorkerRegistrationSettingsLockSettingsManagerSharedWorkerStorageEventStyleSheetStyleSheetListSubtleCryptoSVGAElementSVGAngleSVGAnimateColorElementSVGAnimatedAngleSVGAnimatedBooleanSVGAnimatedEnumerationSVGAnimatedIntegerSVGAnimatedLengthSVGAnimatedLengthListSVGAnimatedNumberSVGAnimatedNumberListSVGAnimatedPointsSVGAnimatedPreserveAspectRatioSVGAnimatedRectSVGAnimatedStringSVGAnimatedTransformListSVGAnimateElementSVGAnimateMotionElementSVGAnimateTransformElementSVGAnimationElementSVGCircleElementSVGClipPathElementSVGCursorElementSVGDefsElementSVGDescElementSVGElementSVGEllipseElementSVGFilterElementSVGFontElementSVGFontFaceElementSVGFontFaceFormatElementSVGFontFaceNameElementSVGFontFaceSrcElementSVGFontFaceUriElementSVGForeignObjectElementSVGGElementSVGGlyphElementSVGGradientElementSVGHKernElementSVGImageElementSVGLengthSVGLengthListSVGLinearGradientElementSVGLineElementSVGMaskElementSVGMatrixSVGMissingGlyphElementSVGMPathElementSVGNumberSVGNumberListSVGPathElementSVGPatternElementSVGPointSVGPolygonElementSVGPolylineElementSVGPreserveAspectRatioSVGRadialGradientElementSVGRectSVGRectElementSVGScriptElementSVGSetElementSVGStopElementSVGStringListSVGStylableSVGStyleElementSVGSVGElementSVGSwitchElementSVGSymbolElementSVGTestsSVGTextElementSVGTextPositioningElementSVGTitleElementSVGTransformSVGTransformableSVGTransformListSVGTRefElementSVGTSpanElementSVGUseElementSVGViewElementSVGVKernElement
TCPServerSocketTCPSocketTelephonyTelephonyCallTextTextDecoderTextEncoderTextMetricsTimeRangesTouchTouchEventTouchListTransferableTransitionEventTreeWalkerTypeInfo
WaveShaperNodeWebBluetoothWebGLRenderingContextWebSMSWebSocketWebVTTWheelEventWifiManagerWindowWindowBase64WindowEventHandlersWindowTimersWorkerWorkerGlobalScopeWorkerLocationWorkerNavigator
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