tus.innerHTML = CONNECTION_LOST_MESSAGE;
            connectionStatus.style.color = '#e53935';

            let switcher = false;
            let backgroundInterval = setInterval(function () {
                if (!switcher) {
                    invisibleElement(connectionStatus);
                } else {
                    visibleElement(connectionStatus);
                }
                switcher = !switcher;
            }, 130);

            let backgroundTimeout = setTimeout(function () {
            