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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AbstractWorkerAnalyserNodeAnimationAnimationEventApps.mgmtArrayBufferViewAttrAudioBufferAudioBufferSourceNodeAudioChannelManagerAudioContextAudioDestinationNodeAudioListenerAudioNodeAudioParamAudioProcessingEvent
BatteryManagerBeforeInstallPromptEventBeforeUnloadEventBiquadFilterNodeBlobBlobBuilderBlobEventBluetoothAdapterBluetoothAdapterEventBluetoothAttributeEventBluetoothClassOfDeviceBluetoothDeviceBluetoothDeviceEventBluetoothDiscoveryHandleBluetoothGattBluetoothGattCharacteristicBluetoothGattCharacteristicEventBluetoothGattDescriptorBluetoothGattServerBluetoothGattServiceBluetoothLeDeviceEventBluetoothManagerBluetoothPairingEventBluetoothPairingHandleBluetoothPairingListenerBluetoothStatusChangedEventBodyBroadcastChannelByteString
CDATASectionCSSCSSConditionRuleCSSCounterStyleRuleCSSGroupingRuleCSSKeyframeRuleCSSKeyframesRuleCSSMatrixCSSMediaRuleCSSNamespaceRuleCSSPageRuleCSSRuleCSSRuleListCSSStyleDeclarationCSSStyleRuleCSSStyleSheetCSSSupportsRuleCacheCacheStorageCallEventCameraCapabilitiesCameraControlCameraManagerCanvasCaptureMediaStreamCanvasGradientCanvasImageSourceCanvasPatternCanvasRenderingContext2DCaretPositionChannelMergerNodeChannelSplitterNodeCharacterDataChildNodeChromeWorkerClientClientsClipboardEventCloseEventCommentCompositionEventConnectionConsoleContactManagerConvolverNodeCoordinatesCryptoCryptoKeyCustomEvent
DOMApplicationDOMApplicationsManagerDOMApplicationsRegistryDOMConfigurationDOMCursorDOMErrorDOMErrorHandlerDOMExceptionDOMHighResTimeStampDOMImplementationDOMImplementationListDOMImplementationRegistryDOMImplementationSourceDOMLocatorDOMMatrixDOMMatrixReadOnlyDOMObjectDOMParserDOMPointDOMPointReadOnlyDOMRectDOMRectReadOnlyDOMRequestDOMStringDOMStringListDOMStringMapDOMTimeStampDOMTokenListDOMUserDataDataStoreDataStoreChangeEventDataStoreCursorDataStoreTaskDataTransferDedicatedWorkerGlobalScopeDelayNodeDeviceAccelerationDeviceLightEventDeviceMotionEventDeviceOrientationEventDeviceProximityEventDeviceRotationRateDeviceStorageDeviceStorageChangeEventDirectoryEntryDirectoryEntrySyncDirectoryReaderDirectoryReaderSyncDocumentDocumentFragmentDocumentTouchDocumentTypeDragEventDynamicsCompressorNode
ElementElementTraversalEntityEntityReferenceEntryEntrySyncErrorEventEventEventListenerEventSourceEventTargetExtendableEvent
FMRadioFetchEventFileFileEntryFileEntrySyncFileErrorFileExceptionFileHandleFileListFileReaderFileReaderSyncFileRequestFileSystemFileSystemSyncFocusEventFormData
HMDVRDeviceHTMLAnchorElementHTMLAreaElementHTMLAudioElementHTMLBRElementHTMLBaseElementHTMLBaseFontElementHTMLBodyElementHTMLButtonElementHTMLCanvasElementHTMLCollectionHTMLContentElementHTMLDListElementHTMLDataElementHTMLDataListElementHTMLDialogElementHTMLDivElementHTMLDocumentHTMLElementHTMLEmbedElementHTMLFieldSetElementHTMLFormControlsCollectionHTMLFormElementHTMLFrameSetElementHTMLHRElementHTMLHeadElementHTMLHeadingElementHTMLHtmlElementHTMLIFrameElementHTMLImageElementHTMLInputElementHTMLIsIndexElementHTMLKeygenElementHTMLLIElementHTMLLabelElementHTMLLegendElementHTMLLinkElementHTMLMapElementHTMLMediaElementHTMLMetaElementHTMLMeterElementHTMLModElementHTMLOListElementHTMLObjectElementHTMLOptGroupElementHTMLOptionElementHTMLOptionsCollectionHTMLOutputElementHTMLParagraphElementHTMLParamElementHTMLPictureElementHTMLPreElementHTMLProgressElementHTMLQuoteElementHTMLScriptElementHTMLSelectElementHTMLShadowElementHTMLSourceElementHTMLSpanElementHTMLStyleElementHTMLTableCaptionElementHTMLTableCellElementHTMLTableColElementHTMLTableDataCellElementHTMLTableElementHTMLTableHeaderCellElementHTMLTableRowElementHTMLTableSectionElementHTMLTextAreaElementHTMLTimeElementHTMLTitleElementHTMLTrackElementHTMLUListElementHTMLUnknownElementHTMLVideoElementHashChangeEventHeadersHistory
IDBCursorIDBCursorSyncIDBCursorWithValueIDBDatabaseIDBDatabaseExceptionIDBDatabaseSyncIDBEnvironmentIDBEnvironmentSyncIDBFactoryIDBFactorySyncIDBIndexIDBIndexSyncIDBKeyRangeIDBObjectStoreIDBObjectStoreSyncIDBOpenDBRequestIDBRequestIDBTransactionIDBTransactionSyncIDBVersionChangeEventIDBVersionChangeRequestIdentityManagerImageDataIndexInputEventInstallEvent
L10n.formatValueL10n.getL10n.language.codeL10n.language.directionL10n.onceL10n.readyL10n.readyStateL10n.setAttributesLinkStyleLocalFileSystemLocalFileSystemSyncLocalMediaStreamLocationLockedFile
MIDIAccessMIDIConnectionEventMIDIInputMIDIInputMapMIDIOutputMapMediaDevicesMediaElementAudioSourceNodeMediaKeyMessageEventMediaKeySessionMediaKeyStatusMapMediaKeySystemAccessMediaKeySystemConfigurationMediaKeysMediaQueryListMediaQueryListListenerMediaRecorderMediaSourceMediaStreamMediaStreamAudioDestinationNodeMediaStreamAudioSourceNodeMediaStreamEventMediaStreamTrackMessageChannelMessageEventMessagePortMouseEventMouseScrollEventMouseWheelEventMozActivityMozActivityOptionsMozActivityRequestHandlerMozAlarmsManagerMozContactMozContactChangeEventMozIccManagerMozMmsEventMozMmsMessageMozMobileCFInfoMozMobileCellInfoMozMobileConnectionMozMobileConnectionInfoMozMobileICCInfoMozMobileMessageManagerMozMobileMessageThreadMozMobileNetworkInfoMozNDEFRecordMozNFCMozNFCPeerMozNFCTagMozNetworkStatsMozNetworkStatsDataMozNetworkStatsManagerMozSettingsEventMozSmsEventMozSmsFilterMozSmsManagerMozSmsMessageMozSmsSegmentInfoMozSocialMozTimeManagerMozVoicemailMozVoicemailEventMozVoicemailStatusMozWifiConnectionInfoEventMozWifiP2pGroupOwnerMozWifiP2pManagerMozWifiStatusChangeEventMutationEventMutationObserver
NameListNamedNodeMapNavigatorNavigatorGeolocationNavigatorIDNavigatorLanguageNavigatorOnLineNavigatorPluginsNetworkInformationNodeNodeFilterNodeIteratorNodeListNonDocumentTypeChildNodeNotationNotificationNotificationEventNotifyAudioAvailableEvent
PageTransitionEventPannerNodeParentNodePath2DPerformancePerformanceNavigationPerformanceTimingPeriodicSyncEventPeriodicSyncManagerPeriodicSyncRegistrationPeriodicWavePermissionSettingsPermissionStatusPermissionsPluginPluginArrayPointPopStateEventPortCollectionPositionPositionErrorPositionOptionsPositionSensorVRDevicePowerManagerProcessingInstructionProgressEventPromiseResolverPushEventPushManagerPushMessageDataPushSubscription
RTCConfigurationRTCDataChannelRTCDataChannelEventRTCIdentityErrorEventRTCIdentityEventRTCPeerConnectionRTCPeerConnectionIceEventRTCSessionDescriptionRTCSessionDescriptionCallbackRadioNodeListRandomSourceRangeRenderingContextRequestResponse
SVGAElementSVGAngleSVGAnimateColorElementSVGAnimateElementSVGAnimateMotionElementSVGAnimateTransformElementSVGAnimatedAngleSVGAnimatedBooleanSVGAnimatedEnumerationSVGAnimatedIntegerSVGAnimatedLengthSVGAnimatedLengthListSVGAnimatedNumberSVGAnimatedNumberListSVGAnimatedPointsSVGAnimatedPreserveAspectRatioSVGAnimatedRectSVGAnimatedStringSVGAnimatedTransformListSVGAnimationElementSVGCircleElementSVGClipPathElementSVGCursorElementSVGDefsElementSVGDescElementSVGElementSVGEllipseElementSVGEventSVGFilterElementSVGFontElementSVGFontFaceElementSVGFontFaceFormatElementSVGFontFaceNameElementSVGFontFaceSrcElementSVGFontFaceUriElementSVGForeignObjectElementSVGGElementSVGGlyphElementSVGGradientElementSVGHKernElementSVGImageElementSVGLengthSVGLengthListSVGLineElementSVGLinearGradientElementSVGMPathElementSVGMaskElementSVGMatrixSVGMissingGlyphElementSVGNumberSVGNumberListSVGPathElementSVGPatternElementSVGPointSVGPolygonElementSVGPolylineElementSVGPreserveAspectRatioSVGRadialGradientElementSVGRectSVGRectElementSVGSVGElementSVGScriptElementSVGSetElementSVGStopElementSVGStringListSVGStylableSVGStyleElementSVGSwitchElementSVGSymbolElementSVGTRefElementSVGTSpanElementSVGTestsSVGTextElementSVGTextPositioningElementSVGTitleElementSVGTransformSVGTransformListSVGTransformableSVGUseElementSVGVKernElementSVGViewElementScreenScriptProcessorNodeSelectionServiceWorkerServiceWorkerContainerServiceWorkerGlobalScopeServiceWorkerRegistrationSettingsLockSettingsManagerSharedWorkerSharedWorkerGlobalScopeStereoPannerNodeStorageStorageEventStyleSheetStyleSheetListSubtleCryptoSyncEventSyncManagerSyncRegistration
TCPServerSocketTCPSocketTelephonyTelephonyCallTelephonyCallGroupTextTextDecoderTextEncoderTextMetricsTimeEventTimeRangesTouchTouchEventTouchListTransferableTransitionEventTreeWalkerTypeInfo
VRDeviceVREyeParametersVRFieldOfViewVRFieldOfViewReadOnlyVRPositionStateValidityStateVideoPlaybackQuality
WaveShaperNodeWebGLProgramWebGLRenderingContextWebGLShaderWebSocketWheelEventWifiManagerWindowWindowBase64WindowClientWindowEventHandlersWindowEventHandlers.onbeforeprintWindowTimersWorkerWorkerGlobalScopeWorkerLocationWorkerNavigator
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