When writing code for the Web with 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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ANGLE_instanced_arraysAbortControllerAbortSignalAbsoluteOrientationSensorAbstractWorkerAccelerometerAddressErrorsAmbientLightSensorAnalyserNodeAnimationAnimationEffectAnimationEventAnimationPlaybackEventAnimationTimelineArrayBufferViewAttrAudioBufferAudioBufferSourceNodeAudioConfigurationAudioContextAudioContextLatencyCategoryAudioContextOptionsAudioDestinationNodeAudioListenerAudioNodeAudioNodeOptionsAudioParamAudioParamMapAudioProcessingEventAudioScheduledSourceNodeAudioTrackAudioTrackListAuthenticatorAssertionResponseAuthenticatorAttestationResponseAuthenticatorResponse
BaseAudioContextBasicCardRequestBasicCardResponseBatteryManagerBeforeInstallPromptEventBeforeUnloadEventBiquadFilterNodeBlobBlobBuilderBlobEventBluetoothBluetoothAdvertisingDataBluetoothCharacteristicPropertiesBluetoothRemoteGATTCharacteristicBluetoothRemoteGATTDescriptorBluetoothRemoteGATTServerBluetoothRemoteGATTServiceBluetoothStatusChangedEventBodyBroadcastChannelBudgetServiceBudgetStateBufferSourceByteLengthQueuingStrategyByteString
CDATASectionCSSCSSConditionRuleCSSCounterStyleRuleCSSGroupingRuleCSSKeyframeRuleCSSKeyframesRuleCSSMatrixCSSMediaRuleCSSNamespaceRuleCSSOMStringCSSPageRuleCSSPrimitiveValueCSSRuleCSSRuleListCSSStyleDeclarationCSSStyleRuleCSSStyleSheetCSSStyleValueCSSSupportsRuleCSSValueCSSValueListCacheCacheStorageCanvasCaptureMediaStreamTrackCanvasGradientCanvasImageSourceCanvasPatternCanvasRenderingContext2DCaretPositionChannelMergerNodeChannelSplitterNodeCharacterDataChildNodeClientClientsClipboardClipboardEventCloseEventCommentCompositionEventConsoleConstantSourceNodeConstrainBooleanConstrainDOMStringConstrainDoubleConstrainLongConvolverNodeCoordinatesCountQueuingStrategyCredentialCredentialsContainerCryptoCryptoKeyCustomElementRegistryCustomEvent
DOMConfigurationDOMErrorDOMExceptionDOMHighResTimeStampDOMImplementationDOMImplementationListDOMLocatorDOMMatrixDOMMatrixReadOnlyDOMObjectDOMParserDOMPointDOMPointInitDOMPointReadOnlyDOMQuadDOMRectDOMRectReadOnlyDOMStringDOMStringListDOMStringMapDOMTimeStampDOMTokenListDOMUserDataDataTransferDataTransferItemDataTransferItemListDedicatedWorkerGlobalScopeDelayNodeDeviceAccelerationDeviceLightEventDeviceMotionEventDeviceOrientationEventDeviceProximityEventDeviceRotationRateDirectoryEntrySyncDirectoryReaderSyncDocumentDocumentFragmentDocumentOrShadowRootDocumentTimelineDocumentTouchDocumentTypeDoubleRangeDragEventDynamicsCompressorNode
EXT_blend_minmaxEXT_color_buffer_floatEXT_color_buffer_half_floatEXT_disjoint_timer_queryEXT_frag_depthEXT_sRGBEXT_shader_texture_lodEXT_texture_filter_anisotropicEffectTimingElementElementTraversalErrorEventEventEventListenerEventSourceEventTargetExtendableEventExtendableMessageEvent
FederatedCredentialFetchEventFileFileEntrySyncFileErrorFileExceptionFileListFileReaderFileReaderSyncFileRequestFileSystemFileSystemDirectoryEntryFileSystemDirectoryReaderFileSystemEntryFileSystemEntrySyncFileSystemFileEntryFileSystemFlagsFileSystemSyncFocusEventFontFaceFontFaceSetFontFaceSetLoadEventFormData
GainNodeGamepadGamepadButtonGamepadEventGamepadHapticActuatorGamepadPoseGeolocationGeometryUtilsGestureEventGlobalEventHandlersGyroscope
HMDVRDeviceHTMLAnchorElementHTMLAreaElementHTMLAudioElementHTMLBRElementHTMLBaseElementHTMLBaseFontElementHTMLBodyElementHTMLButtonElementHTMLCanvasElementHTMLCollectionHTMLContentElementHTMLDListElementHTMLDataElementHTMLDataListElementHTMLDetailsElementHTMLDialogElementHTMLDivElementHTMLDocumentHTMLElementHTMLEmbedElementHTMLFieldSetElementHTMLFontElementHTMLFormControlsCollectionHTMLFormElementHTMLFrameSetElementHTMLHRElementHTMLHeadElementHTMLHeadingElementHTMLHtmlElementHTMLHyperlinkElementUtilsHTMLIFrameElementHTMLImageElementHTMLInputElementHTMLIsIndexElementHTMLKeygenElementHTMLLIElementHTMLLabelElementHTMLLegendElementHTMLLinkElementHTMLMapElementHTMLMarqueeElementHTMLMediaElementHTMLMetaElementHTMLMeterElementHTMLModElementHTMLOListElementHTMLObjectElementHTMLOptGroupElementHTMLOptionElementHTMLOptionsCollectionHTMLOutputElementHTMLParagraphElementHTMLParamElementHTMLPictureElementHTMLPreElementHTMLProgressElementHTMLQuoteElementHTMLScriptElementHTMLSelectElementHTMLShadowElementHTMLSlotElementHTMLSourceElementHTMLSpanElementHTMLStyleElementHTMLTableCaptionElementHTMLTableCellElementHTMLTableColElementHTMLTableDataCellElementHTMLTableElementHTMLTableHeaderCellElementHTMLTableRowElementHTMLTableSectionElementHTMLTemplateElementHTMLTextAreaElementHTMLTimeElementHTMLTitleElementHTMLTrackElementHTMLUListElementHTMLUnknownElementHTMLVideoElementHashChangeEventHeadersHistory
IDBCursorIDBCursorSyncIDBCursorWithValueIDBDatabaseIDBDatabaseExceptionIDBDatabaseSyncIDBEnvironmentIDBEnvironmentSyncIDBFactoryIDBFactorySyncIDBIndexIDBIndexSyncIDBKeyRangeIDBLocaleAwareKeyRangeIDBMutableFileIDBObjectStoreIDBObjectStoreSyncIDBOpenDBRequestIDBRequestIDBTransactionIDBTransactionSyncIDBVersionChangeEventIDBVersionChangeRequestIIRFilterNodeIdleDeadlineImageBitmapImageBitmapRenderingContextImageCaptureImageDataIndexInputDeviceCapabilitiesInputEventInstallEventInstallTriggerIntersectionObserverIntersectionObserverEntry
L10n.formatValueL10n.getL10n.language.codeL10n.language.directionL10n.onceL10n.readyL10n.readyStateL10n.setAttributesLinearAccelerationSensorLinkStyleLocalFileSystemLocalFileSystemSyncLocalMediaStreamLocationLockLockManagerLockedFileLongRange
MIDIAccessMIDIConnectionEventMIDIInputMIDIInputMapMIDIOutputMapMSCandidateWindowHideMSCandidateWindowShowMSCandidateWindowUpdateMSGestureEventMSGraphicsTrustMSRangeCollectionMSSiteModeEventMagnetometerMediaCapabilitiesInfoMediaConfigurationMediaDecodingConfigurationMediaDeviceInfoMediaDevicesMediaElementAudioSourceNodeMediaEncodingConfigurationMediaErrorMediaKeyMessageEventMediaKeySessionMediaKeyStatusMapMediaKeySystemAccessMediaKeySystemConfigurationMediaKeysMediaMetadataMediaQueryListMediaQueryListEventMediaQueryListListenerMediaRecorderMediaRecorderErrorEventMediaSessionMediaSettingsRangeMediaSourceMediaStreamMediaStreamAudioDestinationNodeMediaStreamAudioSourceNodeMediaStreamConstraintsMediaStreamEventMediaStreamTrackMediaStreamTrackEventMediaTrackConstraintsMediaTrackSettingsMediaTrackSupportedConstraintsMerchantValidationEventMessageChannelMessageEventMessagePortMetadataMimeTypeMimeTypeArrayMouseEventMouseScrollEventMouseWheelEventMutationEventMutationObserverMutationObserverInitMutationRecord
NameListNamedNodeMapNavigationPreloadManagerNavigatorNavigator.msLaunchUri()NavigatorConcurrentHardwareNavigatorGeolocationNavigatorIDNavigatorLanguageNavigatorOnLineNavigatorPluginsNavigatorStorageNetworkInformationNodeNodeFilterNodeIteratorNodeListNonDocumentTypeChildNodeNotationNotificationNotificationEventNotifyAudioAvailableEvent
OES_element_index_uintOES_standard_derivativesOES_texture_floatOES_texture_float_linearOES_texture_half_floatOES_texture_half_float_linearOES_vertex_array_objectOfflineAudioCompletionEventOfflineAudioContextOffscreenCanvasOrientationSensorOscillatorNode
PageTransitionEventPannerNodeParentNodePasswordCredentialPath2DPaymentAddressPaymentDetailsBasePaymentDetailsUpdatePaymentMethodChangeEventPaymentRequestPaymentRequestEventPaymentRequestUpdateEventPaymentResponsePerformancePerformanceEntryPerformanceFrameTimingPerformanceLongTaskTimingPerformanceMarkPerformanceMeasurePerformanceNavigationPerformanceNavigationTimingPerformanceObserverPerformanceObserverEntryListPerformancePaintTimingPerformanceResourceTimingPerformanceServerTimingPerformanceTimingPeriodicWavePermissionStatusPermissionsPhotoCapabilitiesPluginPluginArrayPointPointerEventPopStateEventPositionPositionErrorPositionOptionsPositionSensorVRDevicePresentationPresentationAvailabilityPresentationConnectionPresentationConnectionAvailableEventPresentationConnectionCloseEventPresentationConnectionListPresentationReceiverPresentationRequestProcessingInstructionProgressEventPromiseRejectionEventPublicKeyCredentialPublicKeyCredentialCreationOptionsPublicKeyCredentialRequestOptionsPushEventPushManagerPushMessageDataPushRegistrationManagerPushSubscription
RTCAnswerOptionsRTCCertificateRTCConfigurationRTCDTMFSenderRTCDTMFToneChangeEventRTCDataChannelRTCDataChannelEventRTCIceCandidateRTCIceCandidateInitRTCIceCandidatePairRTCIceCandidateTypeRTCIceComponentRTCIceGathererStateRTCIceParametersRTCIceProtocolRTCIceRoleRTCIceServerRTCIceTcpCandidateTypeRTCIceTransportRTCIceTransportStateRTCIdentityAssertionRTCIdentityErrorEventRTCIdentityEventRTCOfferAnswerOptionsRTCOfferOptionsRTCPeerConnectionRTCPeerConnectionIceEventRTCRtpCodecParametersRTCRtpContributingSourceRTCRtpEncodingParametersRTCRtpReceiverRTCRtpSenderRTCRtpStreamStatsRTCRtpSynchronizationSourceRTCRtpTransceiverRTCRtpTransceiverDirectionRTCRtpTransceiverInitRTCSctpTransportRTCSessionDescriptionRTCSessionDescriptionCallbackRTCStatsReportRTCTrackEventRTCTrackEventInitRadioNodeListRangeReadableByteStreamControllerReadableStreamReadableStreamBYOBReaderReadableStreamBYOBRequestReadableStreamDefaultControllerReadableStreamDefaultReaderRelativeOrientationSensorRenderingContextRequestRequestDestinationResponse
SVGAElementSVGAltGlyphDefElementSVGAltGlyphElementSVGAltGlyphItemElementSVGAngleSVGAnimateColorElementSVGAnimateElementSVGAnimateMotionElementSVGAnimateTransformElementSVGAnimatedAngleSVGAnimatedBooleanSVGAnimatedEnumerationSVGAnimatedIntegerSVGAnimatedLengthSVGAnimatedLengthListSVGAnimatedNumberSVGAnimatedNumberListSVGAnimatedPointsSVGAnimatedPreserveAspectRatioSVGAnimatedRectSVGAnimatedStringSVGAnimatedTransformListSVGAnimationElementSVGCircleElementSVGClipPathElementSVGColorProfileElementSVGComponentTransferFunctionElementSVGCursorElementSVGDefsElementSVGDescElementSVGElementSVGEllipseElementSVGEventSVGExternalResourcesRequiredSVGFEBlendElementSVGFEComponentTransferElementSVGFECompositeElementSVGFEConvolveMatrixElementSVGFEDiffuseLightingElementSVGFEDisplacementMapElementSVGFEDistantLightElementSVGFEDropShadowElementSVGFEFloodElementSVGFEFuncAElementSVGFEFuncBElementSVGFEFuncGElementSVGFEFuncRElementSVGFEGaussianBlurElementSVGFEImageElementSVGFEMergeElementSVGFEMergeNodeElementSVGFEMorphologyElementSVGFEOffsetElementSVGFEPointLightElementSVGFESpecularLightingElementSVGFESpotLightElementSVGFETileElementSVGFETurbulenceElementSVGFilterElementSVGFilterPrimitiveStandardAttributesSVGFontElementSVGFontFaceElementSVGFontFaceFormatElementSVGFontFaceNameElementSVGFontFaceSrcElementSVGFontFaceUriElementSVGForeignObjectElementSVGGElementSVGGeometryElementSVGGlyphElementSVGGlyphRefElementSVGGradientElementSVGGraphicsElementSVGHKernElementSVGImageElementSVGLengthSVGLengthListSVGLineElementSVGLinearGradientElementSVGMPathElementSVGMaskElementSVGMatrixSVGMeshElementSVGMetadataElementSVGMissingGlyphElementSVGNumberSVGNumberListSVGPathElementSVGPatternElementSVGPointSVGPolygonElementSVGPolylineElementSVGPreserveAspectRatioSVGRadialGradientElementSVGRectSVGRectElementSVGRenderingIntentSVGSVGElementSVGScriptElementSVGSetElementSVGSolidcolorElementSVGStopElementSVGStringListSVGStylableSVGStyleElementSVGSwitchElementSVGSymbolElementSVGTRefElementSVGTSpanElementSVGTestsSVGTextContentElementSVGTextElementSVGTextPathElementSVGTextPositioningElementSVGTitleElementSVGTransformSVGTransformListSVGTransformableSVGURIReferenceSVGUnitTypesSVGUseElementSVGVKernElementSVGViewElementSVGZoomAndPanScreenScreenOrientationScriptProcessorNodeSecurityPolicyViolationEventSelectionSensorSensorErrorEventServiceWorkerServiceWorkerContainerServiceWorkerGlobalScopeServiceWorkerMessageEventServiceWorkerRegistrationServiceWorkerStateShadowRootSharedWorkerSharedWorkerGlobalScopeSlotableSourceBufferSourceBufferListSpeechGrammarSpeechGrammarListSpeechRecognitionSpeechRecognitionAlternativeSpeechRecognitionErrorSpeechRecognitionEventSpeechRecognitionResultSpeechRecognitionResultListSpeechSynthesisSpeechSynthesisErrorEventSpeechSynthesisEventSpeechSynthesisUtteranceSpeechSynthesisVoiceStaticRangeStereoPannerNodeStorageStorageEstimateStorageEventStorageManagerStorageQuotaStylePropertyMapStylePropertyMapReadOnlyStyleSheetStyleSheetListSubtleCryptoSyncEventSyncManager
TaskAttributionTimingTextTextDecoderTextEncoderTextMetricsTextTrackTextTrackCueTimeEventTimeRangesTouchTouchEventTouchListTrackDefaultTrackDefaultListTransferableTransitionEventTreeWalkerTypeInfo
UIEventURLURLSearchParamsURLUtilsReadOnlyUSBUSBDeviceUSVStringUserDataHandlerUserProximityEvent
VRDisplayVRDisplayCapabilitiesVRDisplayEventVREyeParametersVRFieldOfViewVRFrameDataVRLayerInitVRPoseVRStageParametersVTTCueVTTRegionValidityStateVideoConfigurationVideoPlaybackQualityVisualViewport
WEBGL_color_buffer_floatWEBGL_compressed_texture_astcWEBGL_compressed_texture_atcWEBGL_compressed_texture_etcWEBGL_compressed_texture_etc1WEBGL_compressed_texture_pvrtcWEBGL_compressed_texture_s3tcWEBGL_compressed_texture_s3tc_srgbWEBGL_debug_renderer_infoWEBGL_debug_shadersWEBGL_depth_textureWEBGL_draw_buffersWEBGL_lose_contextWaveShaperNodeWebGL2RenderingContextWebGLActiveInfoWebGLBufferWebGLContextEventWebGLFramebufferWebGLProgramWebGLQueryWebGLRenderbufferWebGLRenderingContextWebGLSamplerWebGLShaderWebGLShaderPrecisionFormatWebGLSyncWebGLTextureWebGLTransformFeedbackWebGLUniformLocationWebGLVertexArrayObjectWebSocketWheelEventWindowWindowClientWindowEventHandlersWindowOrWorkerGlobalScopeWorkerWorkerGlobalScopeWorkerLocationWorkerNavigatorWorkletWritableStreamWritableStreamDefaultControllerWritableStreamDefaultWriter
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