export declare const isElement: (n: unknown) => n is Element;
export declare const isImage: (n: unknown) => n is HTMLImageElement;
export declare const isHtmlElement: (n: unknown) => n is HTMLElement;
export declare const isInput: (n: unknown) => n is HTMLInputElement;
export declare const isTextArea: (n: unknown) => n is HTMLTextAreaElement;
export declare const isSelect: (n: unknown) => n is HTMLSelectElement;
export declare const isButton: (n: unknown) => n is HTMLButtonElement;
export declare const isForm: (n: unknown) => n is HTMLFormElement;
export declare const isFrame: (n: unknown) => n is HTMLIFrameElement;
export declare function valuePrototypeOf(el: Element): object | undefined;