export declare enum PopoverBackdropDataAttributes {
    /**
     * Present when the popup is open.
     */
    open = "data-open",
    /**
     * Present when the popup is closed.
     */
    closed = "data-closed",
    /**
     * Present when the popup is animating in.
     */
    startingStyle = "data-starting-style",
    /**
     * Present when the popup is animating out.
     */
    endingStyle = "data-ending-style"
}