/**
 * Determines which element is on top when multiple elements overlap.
 * Priority:
 * 1. If pointer coordinates are available, use elementsFromPoint (most accurate)
 * 2. If elements are nested, the most-nested (contained) element is on top
 * 3. Otherwise, elements that appear later in DOM order are on top
 */
export declare function getTopmostElement(elements: HTMLElement[], pointerEvent?: Event): HTMLElement | null;