When writing code for the Web, there are a large number of Web APIs available. Below is a list of all the APIs and interfaces (object types) that you may be able to use while developing your Web app or site.
Web APIs are typically used with JavaScript, although this doesn't always have to be the case.
Specifications
This is a list of all the APIs that are available.
ABC
- CSS Counter Styles
- CSS Font Loading API
- CSSOM
- Canvas API
- Channel Messaging API
- Console API
- Credential Management API
- Media Capabilities API
- Media Capture and Streams
- Media Session API
- Media Source Extensions
- MediaStream Recording
- Page Visibility API
- Payment Request API
- Performance API
- Performance Timeline API
- Permissions API
- Pointer Events
- Pointer Lock API
- Proximity Events
- Push API
Interfaces
This is a list of all the interfaces (that is, types of objects) that are available.
A
ANGLE_instanced_arraysAbortControllerAbortSignalAbsoluteOrientationSensorAbstractRangeAbstractWorkerAccelerometerAddressErrorsAesCbcParamsAesCtrParamsAesGcmParamsAesKeyGenParamsAmbientLightSensorAnalyserNodeAnimationAnimationEffectAnimationEventAnimationPlaybackEventAnimationTimelineArrayBufferViewAttrAudioBufferAudioBufferSourceNodeAudioConfigurationAudioContextAudioContextLatencyCategoryAudioContextOptionsAudioDestinationNodeAudioListenerAudioNodeAudioNodeOptionsAudioParamAudioParamDescriptorAudioParamMapAudioProcessingEventAudioScheduledSourceNodeAudioTrackAudioTrackListAudioWorkletAudioWorkletGlobalScopeAudioWorkletNodeAudioWorkletNodeOptionsAudioWorkletProcessorAuthenticatorAssertionResponseAuthenticatorAttestationResponseAuthenticatorResponse
BaseAudioContextBasicCardRequestBasicCardResponseBatteryManagerBeforeInstallPromptEventBeforeUnloadEventBiquadFilterNodeBlobBlobBuilderBlobEventBluetoothBluetoothAdvertisingDataBluetoothCharacteristicPropertiesBluetoothDeviceBluetoothRemoteGATTCharacteristicBluetoothRemoteGATTDescriptorBluetoothRemoteGATTServerBluetoothRemoteGATTServiceBodyBroadcastChannelBudgetServiceBudgetStateBufferSourceByteLengthQueuingStrategyByteString
CDATASectionCSSCSSConditionRuleCSSCounterStyleRuleCSSGroupingRuleCSSImageValueCSSKeyframeRuleCSSKeyframesRuleCSSKeywordValueCSSMathSumCSSMathValueCSSMediaRuleCSSNamespaceRuleCSSNumericValueCSSOMStringCSSPageRuleCSSPositionValueCSSPrimitiveValueCSSPseudoElementCSSRuleCSSRuleListCSSStyleDeclarationCSSStyleRuleCSSStyleSheetCSSStyleValueCSSSupportsRuleCSSUnitValueCSSUnparsedValueCSSValueCSSValueListCSSVariableReferenceValueCacheCacheStorageCanvasCaptureMediaStreamTrackCanvasGradientCanvasImageSourceCanvasPatternCanvasRenderingContext2DCaretPositionChannelMergerNodeChannelSplitterNodeCharacterDataChildNodeClientClientsClipboardClipboardEventCloseEventCommentCompositionEventConstantSourceNodeConstrainBooleanConstrainDOMStringConstrainDoubleConstrainULongConvolverNodeCountQueuingStrategyCrashReportBodyCredentialCredentialsContainerCryptoCryptoKeyCryptoKeyPairCustomElementRegistryCustomEvent
DOMConfigurationDOMErrorDOMExceptionDOMHighResTimeStampDOMImplementationDOMImplementationListDOMLocatorDOMMatrixDOMMatrixReadOnlyDOMObjectDOMParserDOMPointDOMPointInitDOMPointReadOnlyDOMQuadDOMRectDOMRectReadOnlyDOMStringDOMStringListDOMStringMapDOMTimeStampDOMTokenListDOMUserDataDataTransferDataTransferItemDataTransferItemListDedicatedWorkerGlobalScopeDelayNodeDeprecationReportBodyDeviceLightEventDeviceMotionEventDeviceMotionEventAccelerationDeviceMotionEventRotationRateDeviceOrientationEventDeviceProximityEventDirectoryEntrySyncDirectoryReaderSyncDisplayMediaStreamConstraintsDocumentDocumentFragmentDocumentOrShadowRootDocumentTimelineDocumentTouchDocumentTypeDoubleRangeDragEventDynamicsCompressorNode
EXT_blend_minmaxEXT_color_buffer_floatEXT_color_buffer_half_floatEXT_disjoint_timer_queryEXT_float_blendEXT_frag_depthEXT_sRGBEXT_shader_texture_lodEXT_texture_compression_bptcEXT_texture_compression_rgtcEXT_texture_filter_anisotropicEcKeyGenParamsEcKeyImportParamsEcdhKeyDeriveParamsEcdsaParamsEffectTimingElementElementCSSInlineStyleElementTraversalErrorEventEventEventListenerEventSourceEventTargetExtendableEventExtendableMessageEvent
FeaturePolicyFederatedCredentialFetchEventFileFileEntrySyncFileErrorFileExceptionFileListFileReaderFileReaderSyncFileRequestFileSystemFileSystemDirectoryEntryFileSystemDirectoryReaderFileSystemEntryFileSystemEntrySyncFileSystemFileEntryFileSystemFlagsFileSystemSyncFocusEventFontFaceFontFaceSetFontFaceSetLoadEventFormDataFormDataEntryValueFormDataEventFullscreenOptions
GainNodeGamepadGamepadButtonGamepadEventGamepadHapticActuatorGamepadPoseGeolocationGeolocationCoordinatesGeolocationPositionGeolocationPositionErrorGeometryUtilsGestureEventGlobalEventHandlersGyroscope
HMDVRDeviceHTMLAnchorElementHTMLAreaElementHTMLAudioElementHTMLBRElementHTMLBaseElementHTMLBaseFontElementHTMLBodyElementHTMLButtonElementHTMLCanvasElementHTMLCollectionHTMLContentElementHTMLDListElementHTMLDataElementHTMLDataListElementHTMLDetailsElementHTMLDialogElementHTMLDivElementHTMLDocumentHTMLElementHTMLEmbedElementHTMLFieldSetElementHTMLFontElementHTMLFormControlsCollectionHTMLFormElementHTMLFrameSetElementHTMLHRElementHTMLHeadElementHTMLHeadingElementHTMLHtmlElementHTMLHyperlinkElementUtilsHTMLIFrameElementHTMLImageElementHTMLInputElementHTMLIsIndexElementHTMLKeygenElementHTMLLIElementHTMLLabelElementHTMLLegendElementHTMLLinkElementHTMLMapElementHTMLMarqueeElementHTMLMediaElementHTMLMenuElementHTMLMenuItemElementHTMLMetaElementHTMLMeterElementHTMLModElementHTMLOListElementHTMLObjectElementHTMLOptGroupElementHTMLOptionElementHTMLOptionsCollectionHTMLOrForeignElementHTMLOutputElementHTMLParagraphElementHTMLParamElementHTMLPictureElementHTMLPreElementHTMLProgressElementHTMLQuoteElementHTMLScriptElementHTMLSelectElementHTMLShadowElementHTMLSlotElementHTMLSourceElementHTMLSpanElementHTMLStyleElementHTMLTableCaptionElementHTMLTableCellElementHTMLTableColElementHTMLTableElementHTMLTableRowElementHTMLTableSectionElementHTMLTemplateElementHTMLTextAreaElementHTMLTimeElementHTMLTitleElementHTMLTrackElementHTMLUListElementHTMLUnknownElementHTMLVideoElementHashChangeEventHeadersHistoryHkdfParamsHmacImportParamsHmacKeyGenParams
IDBCursorIDBCursorSyncIDBCursorWithValueIDBDatabaseIDBDatabaseExceptionIDBDatabaseSyncIDBEnvironmentIDBEnvironmentSyncIDBFactoryIDBFactorySyncIDBIndexIDBIndexSyncIDBKeyRangeIDBLocaleAwareKeyRangeIDBMutableFileIDBObjectStoreIDBObjectStoreSyncIDBOpenDBRequestIDBRequestIDBTransactionIDBTransactionSyncIDBVersionChangeEventIDBVersionChangeRequestIIRFilterNodeIdleDeadlineImageBitmapImageBitmapRenderingContextImageCaptureImageDataIndexInputDeviceCapabilitiesInputEventInstallEventInstallTriggerIntersectionObserverIntersectionObserverEntryInterventionReportBody
LinearAccelerationSensorLinkStyleLocalFileSystemLocalFileSystemSyncLocalMediaStreamLocationLockLockManagerLockedFile
MIDIAccessMIDIConnectionEventMIDIInputMIDIInputMapMIDIMessageEventMIDIOutputMapMSCandidateWindowHideMSCandidateWindowShowMSCandidateWindowUpdateMSGestureEventMSGraphicsTrustMSManipulationEventMSRangeCollectionMSSiteModeEventMagnetometerMathMLElementMediaCapabilitiesMediaCapabilitiesInfoMediaConfigurationMediaDecodingConfigurationMediaDeviceInfoMediaDevicesMediaElementAudioSourceNodeMediaEncodingConfigurationMediaErrorMediaKeyMessageEventMediaKeySessionMediaKeyStatusMapMediaKeySystemAccessMediaKeySystemConfigurationMediaKeysMediaListMediaMetadataMediaQueryListMediaQueryListEventMediaQueryListListenerMediaRecorderMediaRecorderErrorEventMediaSessionMediaSettingsRangeMediaSourceMediaStreamMediaStreamAudioDestinationNodeMediaStreamAudioSourceNodeMediaStreamAudioSourceOptionsMediaStreamConstraintsMediaStreamEventMediaStreamTrackMediaStreamTrackAudioSourceNodeMediaStreamTrackAudioSourceOptionsMediaStreamTrackEventMediaTrackConstraintsMediaTrackSettingsMediaTrackSupportedConstraintsMerchantValidationEventMessageChannelMessageEventMessagePortMetadataMimeTypeMimeTypeArrayMouseEventMouseScrollEventMouseWheelEventMutationEventMutationObserverMutationObserverInitMutationRecord
NDEFMessageNDEFReaderNDEFReadingEventNDEFRecordNDEFWriterNameListNamedNodeMapNavigationPreloadManagerNavigatorNavigatorConcurrentHardwareNavigatorIDNavigatorLanguageNavigatorOnLineNavigatorPluginsNavigatorStorageNetworkInformationNodeNodeFilterNodeIteratorNodeListNonDocumentTypeChildNodeNotationNotificationNotificationActionNotificationEventNotifyAudioAvailableEvent
OES_element_index_uintOES_fbo_render_mipmapOES_standard_derivativesOES_texture_floatOES_texture_float_linearOES_texture_half_floatOES_texture_half_float_linearOES_vertex_array_objectOVR_multiview2OfflineAudioCompletionEventOfflineAudioContextOffscreenCanvasOrientationSensorOscillatorNodeOverconstrainedError
PageTransitionEventPaintWorkletPannerNodeParentNodePasswordCredentialPath2DPayerErrorsPaymentAddressPaymentCurrencyAmountPaymentDetailsBasePaymentDetailsUpdatePaymentItemPaymentMethodChangeEventPaymentRequestPaymentRequestEventPaymentRequestUpdateEventPaymentResponsePaymentValidationErrorsPbkdf2ParamsPerformancePerformanceEntryPerformanceFrameTimingPerformanceLongTaskTimingPerformanceMarkPerformanceMeasurePerformanceNavigationPerformanceNavigationTimingPerformanceObserverPerformanceObserverEntryListPerformancePaintTimingPerformanceResourceTimingPerformanceServerTimingPerformanceTimingPeriodicWavePermissionStatusPermissionsPhotoCapabilitiesPluginPluginArrayPointPointerEventPopStateEventPositionOptionsPositionSensorVRDevicePresentationPresentationAvailabilityPresentationConnectionPresentationConnectionAvailableEventPresentationConnectionCloseEventPresentationConnectionListPresentationReceiverPresentationRequestProcessingInstructionProgressEventPromiseRejectionEventPublicKeyCredentialPublicKeyCredentialCreationOptionsPublicKeyCredentialRequestOptionsPushEventPushManagerPushMessageDataPushRegistrationManagerPushSubscription
RTCAnswerOptionsRTCCertificateRTCConfigurationRTCDTMFSenderRTCDTMFToneChangeEventRTCDataChannelRTCDataChannelEventRTCDtlsTransportRTCIceCandidateRTCIceCandidateInitRTCIceCandidatePairRTCIceCandidatePairStatsRTCIceCandidateStatsRTCIceCandidateTypeRTCIceComponentRTCIceCredentialTypeRTCIceGathererStateRTCIceParametersRTCIceProtocolRTCIceRoleRTCIceServerRTCIceTcpCandidateTypeRTCIceTransportRTCIceTransportStateRTCIdentityAssertionRTCIdentityErrorEventRTCIdentityEventRTCInboundRtpStreamStatsRTCNetworkTypeRTCOfferAnswerOptionsRTCOfferOptionsRTCOutboundRtpStreamStatsRTCPeerConnectionRTCPeerConnectionIceEventRTCRtpCodecParametersRTCRtpContributingSourceRTCRtpEncodingParametersRTCRtpReceiverRTCRtpSendParametersRTCRtpSenderRTCRtpStreamStatsRTCRtpSynchronizationSourceRTCRtpTransceiverRTCRtpTransceiverDirectionRTCRtpTransceiverInitRTCSctpTransportRTCSessionDescriptionRTCSessionDescriptionCallbackRTCStatsRTCStatsIceCandidatePairStateRTCStatsReportRTCStatsTypeRTCTrackEventRTCTrackEventInitRadioNodeListRangeReadableByteStreamControllerReadableStreamReadableStreamBYOBReaderReadableStreamBYOBRequestReadableStreamDefaultControllerReadableStreamDefaultReaderRelativeOrientationSensorRenderingContextReportReportingObserverReportingObserverOptionsRequestRequestDestinationResizeObserverResizeObserverEntryResponseRsaHashedImportParamsRsaHashedKeyGenParamsRsaOaepParamsRsaPssParams
SVGAElementSVGAltGlyphDefElementSVGAltGlyphElementSVGAltGlyphItemElementSVGAngleSVGAnimateColorElementSVGAnimateElementSVGAnimateMotionElementSVGAnimateTransformElementSVGAnimatedAngleSVGAnimatedBooleanSVGAnimatedEnumerationSVGAnimatedIntegerSVGAnimatedLengthSVGAnimatedLengthListSVGAnimatedNumberSVGAnimatedNumberListSVGAnimatedPointsSVGAnimatedPreserveAspectRatioSVGAnimatedRectSVGAnimatedStringSVGAnimatedTransformListSVGAnimationElementSVGCircleElementSVGClipPathElementSVGColorProfileElementSVGComponentTransferFunctionElementSVGCursorElementSVGDefsElementSVGDescElementSVGElementSVGEllipseElementSVGEventSVGExternalResourcesRequiredSVGFEBlendElementSVGFEColorMatrixElementSVGFEComponentTransferElementSVGFECompositeElementSVGFEConvolveMatrixElementSVGFEDiffuseLightingElementSVGFEDisplacementMapElementSVGFEDistantLightElementSVGFEDropShadowElementSVGFEFloodElementSVGFEFuncAElementSVGFEFuncBElementSVGFEFuncGElementSVGFEFuncRElementSVGFEGaussianBlurElementSVGFEImageElementSVGFEMergeElementSVGFEMergeNodeElementSVGFEMorphologyElementSVGFEOffsetElementSVGFEPointLightElementSVGFESpecularLightingElementSVGFESpotLightElementSVGFETileElementSVGFETurbulenceElementSVGFilterElementSVGFilterPrimitiveStandardAttributesSVGFontElementSVGFontFaceElementSVGFontFaceFormatElementSVGFontFaceNameElementSVGFontFaceSrcElementSVGFontFaceUriElementSVGForeignObjectElementSVGGElementSVGGeometryElementSVGGlyphElementSVGGlyphRefElementSVGGradientElementSVGGraphicsElementSVGHKernElementSVGImageElementSVGLengthSVGLengthListSVGLineElementSVGLinearGradientElementSVGMPathElementSVGMaskElementSVGMatrixSVGMeshElementSVGMetadataElementSVGMissingGlyphElementSVGNumberSVGNumberListSVGPathElementSVGPatternElementSVGPointSVGPolygonElementSVGPolylineElementSVGPreserveAspectRatioSVGRadialGradientElementSVGRectSVGRectElementSVGRenderingIntentSVGSVGElementSVGScriptElementSVGSetElementSVGSolidcolorElementSVGStopElementSVGStringListSVGStylableSVGStyleElementSVGSwitchElementSVGSymbolElementSVGTRefElementSVGTSpanElementSVGTestsSVGTextContentElementSVGTextElementSVGTextPathElementSVGTextPositioningElementSVGTitleElementSVGTransformSVGTransformListSVGTransformableSVGURIReferenceSVGUnitTypesSVGUseElementSVGVKernElementSVGViewElementSVGZoomAndPanScreenScreenOrientationScriptProcessorNodeScrollToOptionsSecurityPolicyViolationEventSelectionSensorSensorErrorEventServiceWorkerServiceWorkerContainerServiceWorkerGlobalScopeServiceWorkerMessageEventServiceWorkerRegistrationServiceWorkerStateShadowRootSharedWorkerSharedWorkerGlobalScopeSlotableSourceBufferSourceBufferListSpeechGrammarSpeechGrammarListSpeechRecognitionSpeechRecognitionAlternativeSpeechRecognitionErrorSpeechRecognitionErrorEventSpeechRecognitionEventSpeechRecognitionResultSpeechRecognitionResultListSpeechSynthesisSpeechSynthesisErrorEventSpeechSynthesisEventSpeechSynthesisUtteranceSpeechSynthesisVoiceStaticRangeStereoPannerNodeStorageStorageEstimateStorageEventStorageManagerStorageQuotaStylePropertyMapStylePropertyMapReadOnlyStyleSheetStyleSheetListSubmitEventSubtleCryptoSyncEventSyncManager
TaskAttributionTimingTextTextDecoderTextEncoderTextMetricsTextRangeTextTrackTextTrackCueTextTrackListTimeEventTimeRangesTouchTouchEventTouchListTrackDefaultTrackDefaultListTrackEventTransferableTransformStreamTransitionEventTreeWalkerTypeInfo
UIEventULongRangeURLURLSearchParamsURLUtilsReadOnlyUSBUSBDeviceUSVStringUserDataHandlerUserProximityEvent
VRDisplayVRDisplayCapabilitiesVRDisplayEventVREyeParametersVRFieldOfViewVRFrameDataVRLayerInitVRPoseVRStageParametersVTTCueVTTRegionValidityStateVideoConfigurationVideoPlaybackQualityVideoTrackVideoTrackListVisualViewport
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_contextWaveShaperNodeWebGL2RenderingContextWebGLActiveInfoWebGLBufferWebGLContextEventWebGLFramebufferWebGLProgramWebGLQueryWebGLRenderbufferWebGLRenderingContextWebGLSamplerWebGLShaderWebGLShaderPrecisionFormatWebGLSyncWebGLTextureWebGLTransformFeedbackWebGLUniformLocationWebGLVertexArrayObjectWebKitCSSMatrixWebSocketWheelEventWindowWindowClientWindowEventHandlersWindowOrWorkerGlobalScopeWorkerWorkerGlobalScopeWorkerLocationWorkerNavigatorWorkletWritableStreamWritableStreamDefaultControllerWritableStreamDefaultWriter
XDomainRequestXMLDocumentXMLHttpRequestXMLHttpRequestEventTargetXMLHttpRequestResponseTypeXMLSerializerXPathEvaluatorXPathExceptionXPathExpressionXPathNSResolverXPathResultXRBoundedReferenceSpaceXREnvironmentBlendModeXREyeXRFrameXRFrameRequestCallbackXRHandednessXRInputSourceXRInputSourceArrayXRInputSourceEventXRInputSourceEventInitXRInputSourcesChangeEventXRInputSourcesChangeEventInitXRPoseXRReferenceSpaceXRReferenceSpaceEventXRReferenceSpaceEventInitXRReferenceSpaceTypeXRRenderStateXRRenderStateInitXRRigidTransformXRSessionXRSessionEventXRSessionEventInitXRSessionInitXRSessionModeXRSpaceXRSystemXRTargetRayModeXRViewXRViewerPoseXRViewportXRVisibilityStateXRWebGLLayerXRWebGLLayerInitXSLTProcessor