export declare const isFirefox: () => boolean;
export declare const isChrome: () => boolean;
export declare const isSafari: () => boolean;
export declare const supportHLS: boolean;
/**
 * Check copied from Overlay.ts
 */
export declare const popoverSupported: boolean;
export declare function getNextAncestor(node: Element): HTMLElement | null;
export declare function findAncestorWithBuggyStyle(element: Element | null, predicate: (element: Element) => boolean): Element | null | undefined;
export declare function findCuttingAncestor(element: Element): Element | null | undefined;
export declare function findContainingBlock(element: Element): Element | null | undefined;
export declare function isIOS(): boolean;
