/**
 * jsdom does not run a layout engine (offsetHeight / getBoundingClientRect stay 0).
 * This harness resolves a minimal column-flex / percentage-height tree from a
 * definite parent size so tests can assert measured fill / footer pin.
 */
export interface JsdomLayoutBox {
    readonly top: number;
    readonly left: number;
    readonly width: number;
    readonly height: number;
}
/**
 * Install measured boxes for `root` and descendants using flex-column / % height rules.
 */
export declare function applyJsdomColumnFillLayout(root: HTMLElement, box: JsdomLayoutBox): void;
/** Resolve definite parent size then fill the subtree (parent itself is measured). */
export declare function applyJsdomColumnFillFromParent(parent: HTMLElement, widthPx: number, heightPx: number): void;
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