import { IRenderer, ISpecification, IRenderable } from '../../api';
/**
 * Implementation of the 'headline' markup element.
 * With no level set, a h2 HTML element is created and the class
 * lto-headline is added to allow CSS manipulations.
 *
 * @see {@link IRenderable}
 */
export declare class Headline implements IRenderable {
    private readonly spec;
    constructor(spec: ISpecification);
    /**
     * @inheritDoc
     */
    render(renderer: IRenderer, isNested: boolean): HTMLElement;
}