/**
 * Browser full screen support — probed once at module load via the
 * unprefixed `fullscreenEnabled` field with vendor-prefixed fallbacks.
 */
export declare const hasFullscreenSupport: boolean;
/**
 * Returns true if the browser/device is in full screen mode.
 *
 * Pure document-state probe — no Application context needed, since the
 * browser tracks exactly one fullscreen element per document regardless
 * of how many Applications are running.
 * @category Application
 * @returns true when any of the four vendor variants of `fullscreenElement` is non-null
 */
export declare function isFullscreen(): boolean;
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