/**
 * Mounts the cloned document into a hidden iframe and waits for it to become
 * paintable.
 *
 * Extracted from DocumentCloner so the cloner only owns node-cloning strategy;
 * this module owns the iframe lifecycle: container creation, document.write,
 * Trusted Types, load polling, webfont/image readiness, the onclone hook and
 * WebKit scroll-anchoring compensation.
 */
import { Bounds } from '../css/layout/bounds';
import { Context } from '../core/context';
export interface CloneMountOptions {
    /** Cloned <html> root to adopt into the iframe document. */
    documentElement: HTMLElement;
    /** Clone of the render target; must exist before mounting. */
    clonedReferenceElement: HTMLElement | undefined;
    /** nodeName of the original render target, for error messages. */
    referenceElementName: string;
    /** [clonedNode, scrollLeft, scrollTop] pairs captured during cloning. */
    scrolledElements: [Element, number, number][];
    /** Consumer hook, invoked with the cloned document before measuring. */
    onclone?: (document: Document, element: HTMLElement) => void;
    /** Mount the iframe inside a shadow root instead of <body>. */
    container?: HTMLElement | ShadowRoot;
    /**
     * Aborting rejects the mount (iframe poll, font/image waits) with an
     * AbortError instead of waiting out the readiness windows.
     */
    signal?: AbortSignal;
}
type TrustedTypePolicyLike = {
    createHTML: (s: string) => string;
};
/**
 * Resolve the Trusted Types policy used for writing the clone document.
 * Returns null when Trusted Types are unavailable or the policy could not be
 * created — document.write is not a Trusted Types sink, so the plain string
 * stays functional in both cases.
 * @internal – exported for testing only.
 */
export declare const resolveTrustedTypesPolicy: (ownerWindow: Window | null) => TrustedTypePolicyLike | null;
export declare const createIFrameContainer: (ownerDocument: Document, bounds: Bounds, customContainer?: HTMLElement | ShadowRoot) => HTMLIFrameElement;
/**
 * Serialise a document type declaration to an HTML string.
 * @internal – exported for testing only, not part of the public API.
 */
export declare const serializeDoctype: (doctype?: DocumentType | null) => string;
/**
 * Point the clone's relative URLs at the source document.
 * @internal – exported for testing only, not part of the public API.
 */
export declare const addBase: (targetELement: HTMLElement, baseUri: string) => void;
export declare const mountCloneInIFrame: (context: Context, ownerDocument: Document, windowSize: Bounds, mount: CloneMountOptions) => Promise<HTMLIFrameElement>;
export {};