HTML*Element (most are partial), the base class being HTMLElement.
HashChangeEvent
History
ImageBitmap
ImageBitmapRenderingContext
ImageData
Location
MediaError
MessageChannel
MessageEvent
MessagePort
MimeType
MimeTypeArray
Navigator
OffscreenCanvas
OffscreenCanvasRenderingContext2D
PageTransitionEvent
Path2D
Plugin
PluginArray
PopStateEvent
PromiseRejectionEvent
RadioNodeList
SharedWorker
SharedWorkerGlobalScope
Storage
StorageEvent
SubmitEvent
TextMetrics
TextTrack
TextTrackCue
TextTrackCueList
TextTrackList
TimeRanges
TrackEvent
ValidityState
VideoTrack
VideoTrackList
WebSocket
Window, partial
Worker
WorkerGlobalScope
WorkerLocation
WorkerNavigator
Mixins:
AbstractWorker
AnimationFrameProvider
CanvasCompositing
CanvasDrawImage
CanvasDrawPath
CanvasFillStrokeStyles
CanvasFilters
CanvasGradient
CanvasImageData
CanvasImageSmoothing
CanvasPath
CanvasPathDrawingStyles
CanvasRect
CanvasShadowStyles
CanvasState
CanvasText
CanvasTextDrawingStyles
CanvasTransform
CanvasUserInterface
DocumentAndElementEventHandlers
DocumentOrShadowRoot
ElementContentEditable
GlobalEventHandlers
HTMLHyperlinkElementUtils
HTMLOrSVGElement
NavigatorConcurrentHardware
NavigatorContentUtils
NavigatorCookies
NavigatorID
NavigatorOnLine
NavigatorPlugins
WindowEventHandlers
WindowOrWorkerGlobalScope
WindowLocalStorage
WindowSessionStorage
ARIA (Accessible Rich Internet Applications) aims at making web content and web applications (especially if developed with JavaScript) more accessible to people with disabilities.