Function that checks Online/Offline Status of Client

gistfile1.js

function updateStatus () {
  var textStaus = navigator.onLine ? "online" . "offline"
  document.getElementById("status").innerHTML = textStatus;

  if (navigator.onLine) {
    document.body.classList.remove("offline");
  } else {
    document.body.classList.add("offline");
  }

}

window.addEventListener("online", updateStatus);
window.addEventListener("offline", updateStatus);

updateStatus();