/*!
 * Jodit Editor (https://xdsoft.net/jodit/)
 * Released under MIT see LICENSE.txt in the project root for license information.
 * Copyright (c) 2013-2026 Valerii Chupurnov. All rights reserved. https://xdsoft.net
 */
/**
 * @module helpers/size
 */
import type { IPoint } from "../../../types/index";
/**
 * Returns the viewport offset of the containing block of a `position: fixed`
 * descendant of `elm`. A fixed element is normally positioned relative to the
 * viewport, but an ancestor with `transform`, `filter`, `perspective`, etc.
 * establishes a new containing block, shifting the fixed element by that
 * ancestor's top-left corner. The returned offset should be subtracted from
 * the desired viewport coordinates before applying them.
 *
 * Returns `{ x: 0, y: 0 }` when no such ancestor exists (the common case), so
 * call sites keep their previous behaviour unchanged.
 */
export declare function getFixedPositionOffset(elm: HTMLElement): IPoint;