declare global {
    interface Document {
        mozSetImageElement?: (imageElementId: string, imageElement: HTMLCanvasElement) => void;
        getCSSCanvasContext?: (contextId: string, name: string, width: number, height: number) => CanvasRenderingContext2D;
    }
}
export type FeatureDetectFn = (targetWindow: Window | undefined) => boolean;
/**
 * Test if the APIs neccessary for the Firefox fallback exist.
 *
 * @returns `true` if the browser supports the necessary APIs, `false` otherwise.
 */
export declare const hasMozElement: FeatureDetectFn;
/**
 * Test if the APIs necessary for the Safari fallback exist.
 *
 * @returns `true` if the browser supports the necessary APIs, `false` otherwise.
 */
export declare const hasWebkitCanvas: FeatureDetectFn;
/**
 * Test if CSS Houdini APIs are available.
 *
 * @returns `true` if the browser supports necessary Houdini APIs, `false` otherwise.
 */
export declare const hasHoudini: FeatureDetectFn;