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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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AbstractWorkerAnalyserNodeAnimationAnimationEventArrayBufferViewAttrAudioBufferAudioBufferSourceNodeAudioChannelManagerAudioContextAudioDestinationNodeAudioListenerAudioNodeAudioParamAudioProcessingEvent
BatteryManagerBeforeInstallPromptBeforeUnloadEventBiquadFilterNodeBlobBlobBuilderBlobEventBluetoothAdapter(Firefox OS)BluetoothAdapterEvent(Firefox OS)BluetoothAttributeEvent(Firefox OS)BluetoothClassOfDevice(Firefox OS)BluetoothDevice(Firefox OS)BluetoothDeviceEvent(Firefox OS)BluetoothDiscoveryHandle(Firefox OS)BluetoothGATTServiceBluetoothGatt(Firefox OS)BluetoothGattCharacteristic(Firefox OS)BluetoothGattCharacteristicEvent(Firefox OS)BluetoothGattDescriptor(Firefox OS)BluetoothGattServer(Firefox OS)BluetoothGattService(Firefox OS)BluetoothLeDeviceEvent(Firefox OS)BluetoothManager(Firefox OS)BluetoothPairingEvent(Firefox OS)BluetoothPairingHandle(Firefox OS)BluetoothPairingListener(Firefox OS)BluetoothStatusChangedEventBodyBroadcastChannelByteString
CDATASectionCSSCSSConditionRuleCSSCounterStyleRuleCSSGroupingRuleCSSKeyframeRuleCSSKeyframesRuleCSSMatrixCSSMediaRuleCSSNamespaceRuleCSSPageRuleCSSRuleCSSRuleListCSSStyleDeclarationCSSStyleRuleCSSStyleSheetCSSSupportsRuleCacheCacheStorageCallEventCameraCapabilitiesCameraControlCameraManagerCanvasCaptureMediaStreamCanvasGradientCanvasImageSourceCanvasPatternCanvasRenderingContext2DCaretPositionChannelMergerNodeChannelSplitterNodeCharacterDataChildNodeChromeWorkerClientClientsClipboardEventCloseEventCommentCompositionEventConnectionConsoleContactManagerConvolverNodeCoordinatesCreateImageBitmapCryptoCryptoKeyCustomEvent
DOMApplicationDOMApplicationsManagerDOMApplicationsRegistryDOMConfigurationDOMCursorDOMErrorDOMErrorHandlerDOMExceptionDOMHighResTimeStampDOMImplementationDOMImplementationListDOMImplementationRegistryDOMImplementationSourceDOMLocatorDOMMatrixDOMMatrixReadOnlyDOMObjectDOMParserDOMPointDOMPointReadOnlyDOMRectDOMRectReadOnlyDOMRequestDOMStringDOMStringListDOMStringMapDOMTimeStampDOMTokenListDOMUserDataDataStoreDataStoreChangeEventDataStoreCursorDataStoreTaskDataTransferDedicatedWorkerGlobalScopeDelayNodeDeviceAccelerationDeviceLightEventDeviceMotionEventDeviceOrientationEventDeviceProximityEventDeviceRotationRateDeviceStorageDeviceStorageChangeEventDirectoryEntryDirectoryEntrySyncDirectoryReaderDirectoryReaderSyncDocumentDocumentFragmentDocumentTouchDocumentTypeDragEventDynamicsCompressorNode
ElementElementTraversalEntityEntityReferenceEntryEntrySyncErrorEventEventEventListenerEventSourceEventTargetExtendableEvent
FMRadioFetchEventFileFileEntryFileEntrySyncFileErrorFileExceptionFileHandleFileListFileReaderFileReaderSyncFileRequestFileSystemFileSystemSyncFocusEventFontFaceSetFormData
HMDVRDeviceHTMLAnchorElementHTMLAreaElementHTMLAudioElementHTMLBRElementHTMLBaseElementHTMLBaseFontElementHTMLBodyElementHTMLButtonElementHTMLCanvasElementHTMLCollectionHTMLContentElementHTMLDListElementHTMLDataElementHTMLDataListElementHTMLDialogElementHTMLDivElementHTMLDocumentHTMLElementHTMLEmbedElementHTMLFieldSetElementHTMLFormControlsCollectionHTMLFormElementHTMLFrameSetElementHTMLHRElementHTMLHeadElementHTMLHeadingElementHTMLHtmlElementHTMLIFrameElementHTMLImageElementHTMLInputElementHTMLIsIndexElementHTMLKeygenElementHTMLLIElementHTMLLabelElementHTMLLegendElementHTMLLinkElementHTMLMapElementHTMLMediaElementHTMLMetaElementHTMLMeterElementHTMLModElementHTMLOListElementHTMLObjectElementHTMLOptGroupElementHTMLOptionElementHTMLOptionsCollectionHTMLOutputElementHTMLParagraphElementHTMLParamElementHTMLPictureElementHTMLPreElementHTMLProgressElementHTMLQuoteElementHTMLScriptElementHTMLSelectElementHTMLShadowElementHTMLSourceElementHTMLSpanElementHTMLStyleElementHTMLTableCaptionElementHTMLTableCellElementHTMLTableColElementHTMLTableDataCellElementHTMLTableElementHTMLTableHeaderCellElementHTMLTableRowElementHTMLTableSectionElementHTMLTextAreaElementHTMLTimeElementHTMLTitleElementHTMLTrackElementHTMLUListElementHTMLUnknownElementHTMLVideoElementHashChangeEventHeadersHistory
IDBCursorIDBCursorSyncIDBCursorWithValueIDBDatabaseIDBDatabaseExceptionIDBDatabaseSyncIDBEnvironmentIDBEnvironmentSyncIDBFactoryIDBFactorySyncIDBIndexIDBIndexSyncIDBKeyRangeIDBObjectStoreIDBObjectStoreSyncIDBOpenDBRequestIDBRequestIDBTransactionIDBTransactionSyncIDBVersionChangeEventIDBVersionChangeRequestIdentityManagerImageBitmapImageDataIndexIndexedDBInputEventInstallEventInstallTrigger
L10nL10n.formatValueL10n.getL10n.language.codeL10n.language.directionL10n.onceL10n.readyL10n.readyStateL10n.setAttributesLinkStyleLocalFileSystemLocalFileSystemSyncLocalMediaStreamLocationLockedFile
MIDIAccessMIDIConnectionEventMIDIInputMIDIInputMapMIDIOutputMapMediaDevicesMediaElementAudioSourceNodeMediaKeyMessageEventMediaKeySessionMediaKeyStatusMapMediaKeySystemAccessMediaKeySystemConfigurationMediaKeysMediaQueryListMediaQueryListListenerMediaRecorderMediaSourceMediaStreamMediaStreamAudioDestinationNodeMediaStreamAudioSourceNodeMediaStreamEventMediaStreamTrackMessageChannelMessageEventMessagePortMouseEventMouseScrollEventMouseWheelEventMozActivityMozActivityOptionsMozActivityRequestHandlerMozAlarmsManagerMozContactMozContactChangeEventMozIccManagerMozMmsEventMozMmsMessageMozMobileCFInfoMozMobileCellInfoMozMobileConnectionMozMobileConnectionInfoMozMobileICCInfoMozMobileMessageManagerMozMobileMessageThreadMozMobileNetworkInfoMozNDEFRecordMozNFCMozNFCPeerMozNFCTagMozNetworkStatsMozNetworkStatsDataMozNetworkStatsManagerMozPowerManagerMozSettingsEventMozSmsEventMozSmsFilterMozSmsManagerMozSmsMessageMozSmsSegmentInfoMozTimeManagerMozVoicemailMozVoicemailEventMozVoicemailStatusMozWifiConnectionInfoEventMozWifiP2pGroupOwnerMozWifiP2pManagerMozWifiStatusChangeEventMutationEventMutationObserver
NameListNamedNodeMapNavigatorNavigatorGeolocationNavigatorIDNavigatorLanguageNavigatorOnLineNavigatorPluginsNetworkInformationNodeNodeFilterNodeIteratorNodeListNonDocumentTypeChildNodeNotationNotificationNotificationEventNotifyAudioAvailableEvent
PageTransitionEventPannerNodeParentNodePath2DPerformancePerformanceNavigationPerformanceTimingPeriodicSyncEventPeriodicSyncManagerPeriodicSyncRegistrationPeriodicWavePermissionSettingsPermissionStatusPermissionsPluginPluginArrayPointPopStateEventPortCollectionPositionPositionErrorPositionOptionsPositionSensorVRDeviceProcessingInstructionProgressEventPromiseRejectionPromiseResolverPushEventPushManagerPushMessageDataPushRegistrationManagerPushSubscription
RTCConfigurationRTCDataChannelRTCDataChannelEventRTCIdentityErrorEventRTCIdentityEventRTCPeerConnectionRTCPeerConnectionIceEventRTCSessionDescriptionRTCSessionDescriptionCallbackRadioNodeListRandomSourceRangeRenderingContextRequestResponse
SVGAElementSVGAngleSVGAnimateColorElementSVGAnimateElementSVGAnimateMotionElementSVGAnimateTransformElementSVGAnimatedAngleSVGAnimatedBooleanSVGAnimatedEnumerationSVGAnimatedIntegerSVGAnimatedLengthSVGAnimatedLengthListSVGAnimatedNumberSVGAnimatedNumberListSVGAnimatedPointsSVGAnimatedPreserveAspectRatioSVGAnimatedRectSVGAnimatedStringSVGAnimatedTransformListSVGAnimationElementSVGCircleElementSVGClipPathElementSVGCursorElementSVGDefsElementSVGDescElementSVGElementSVGEllipseElementSVGEventSVGFilterElementSVGFontElementSVGFontFaceElementSVGFontFaceFormatElementSVGFontFaceNameElementSVGFontFaceSrcElementSVGFontFaceUriElementSVGForeignObjectElementSVGGElementSVGGlyphElementSVGGradientElementSVGHKernElementSVGImageElementSVGLengthSVGLengthListSVGLineElementSVGLinearGradientElementSVGMPathElementSVGMaskElementSVGMatrixSVGMissingGlyphElementSVGNumberSVGNumberListSVGPathElementSVGPatternElementSVGPointSVGPolygonElementSVGPolylineElementSVGPreserveAspectRatioSVGRadialGradientElementSVGRectSVGRectElementSVGSVGElementSVGScriptElementSVGSetElementSVGStopElementSVGStringListSVGStylableSVGStyleElementSVGSwitchElementSVGSymbolElementSVGTRefElementSVGTSpanElementSVGTestsSVGTextElementSVGTextPositioningElementSVGTitleElementSVGTransformSVGTransformListSVGTransformableSVGUseElementSVGVKernElementSVGViewElementScreenScriptProcessorNodeSelectionServiceWorkerServiceWorkerContainerServiceWorkerGlobalScopeServiceWorkerMessageEventServiceWorkerRegistrationSettingsLockSettingsManagerSharedWorkerSharedWorkerGlobalScopeStereoPannerNodeStorageStorageEventStyleSheetStyleSheetListSubtleCryptoSyncEventSyncManagerSyncRegistration
TCPServerSocketTCPSocketTelephonyTelephonyCallTelephonyCallGroupTextTextDecoderTextEncoderTextMetricsTimeEventTimeRangesTouchTouchEventTouchListTransferableTransitionEventTreeWalkerTypeInfo
UDPSocketUIEventURLURLSearchParamsURLUtilsURLUtilsReadOnlyUSVStringUserDataHandlerUserProximityEvent
VRDeviceVREyeParametersVRFieldOfViewVRFieldOfViewReadOnlyVRPositionStateValidityStateVideoPlaybackQuality
WaveShaperNodeWebGLWebGLProgramWebGLRenderingContextWebGLShaderWebSMSWebSocketWebSocketsWebVTTWheelEventWifiManagerWindowWindowBase64WindowClientWindowEventHandlersWindowTimersWorkerWorkerGlobalScopeWorkerLocationWorkerNavigator