gistfile1.js

var messageElement =
  document.querySelector('#message');

cloak.configure({
  messages: {
    waitingForAnotherPlayer: function() {
      messageElement.innerText =
        'Waiting for another player...';
    },
    gameStart: function() {
      messageElement.innerText =
        'The game has begun!';
    }
  }
});
 
cloak.run(serverURL);