window.addEventListener("online");
window.addEventListener('load', function() {
var status = document.getElementById("status");
var log = document.getElementById("log");
function updateOnlineStatus(event) {
var condition = navigator.onLine ? "online" : "offline";
status.className = condition;
status.innerHTML = condition.toUpperCase();
log.insertAdjacentHTML("beforeend", "Event: " + event.type + "; Status: " + condition);
}
window.addEventListener('online', updateOnlineStatus);
window.addEventListener('offline', updateOnlineStatus);
});