/**
 * Anchor resolution (#141).
 *
 * Anchors are a declarative DOM convention, not a ref registry: any element that
 * wants to be spotlightable carries `data-xp-anchor="<id>"`. Built-in chrome and
 * apps set it; custom apps add it too — so authoring a lesson for a custom app
 * needs only the attribute + lesson JSON, no engine change. The overlay resolves
 * the current step's anchor to a live rect (polled each frame, so it tracks
 * window drag/resize). Queries are scoped to a desktop-root element to stay
 * embedding-safe (never reaches into the host page).
 */
export declare const ANCHOR_ATTR = "data-xp-anchor";
/** The desktop-root element enclosing `from` (falls back to document). */
export declare const findDesktopRoot: (from: Element | null) => ParentNode;
/** Resolve an anchor id to its live element within `root`, or null. */
export declare const resolveAnchorEl: (root: ParentNode, id: string) => Element | null;
/** Resolve an anchor id to its live bounding rect within `root`, or null. */
export declare const resolveAnchorRect: (root: ParentNode, id: string) => DOMRect | null;