/**
 * @license Copyright (c) 2003-2026, CKSource Holding sp. z o.o. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-licensing-options
 */
import { Plugin } from '@ckeditor/ckeditor5-core';
import { DataFilter } from '../datafilter.js';
/**
 * Provides the General HTML Support integration for `iframe` elements with a mandatory sandbox attribute.
 */
export declare class IframeElementSupport extends Plugin {
    /**
     * @inheritDoc
     */
    static get requires(): readonly [typeof DataFilter];
    /**
     * @inheritDoc
     */
    static get pluginName(): "IframeElementSupport";
    /**
     * @inheritDoc
     */
    static get isOfficialPlugin(): true;
    /**
     * @inheritDoc
     */
    init(): void;
    /**
     * Sets up the conversion to enforce the sandbox attribute on `iframe` elements.
     */
    private _setupSandboxConversion;
}