FocusEventFocus-related events like focus, blur, focusin, or focusout. interface FocusEvent extends UIEvent {readonly relatedTarget: EventTarget | null;}var FocusEvent: {prototype: FocusEvent; new (type: string, eventInitDict?: FocusEventInit): FocusEvent; };§Extends§UIEvent[src]§Properties§readonly relatedTarget: EventTarget | null[src]