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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

              <h1>Prototyping IoT Demo UI</h1>

<button class="on">Blink LED</button>

<script src="//cdn.pubnub.com/pubnub-3.14.5.min.js"></script>
              button {
  font-size: 2em;
  padding: 10px 20px;
              // Use the same keys that you are going to use for Arduino code with Johnny-Five

var pubnub = PUBNUB.init({
  publish_key: 'pub-c-0b43969b-341d-41f5-a85e-0bd9d30404b8',
  subscribe_key: 'sub-c-cb24903e-c9f4-11e5-b684-02ee2ddab7fe'

// Use the same channel name
var channel = 'led';

var button = document.querySelector('button.on');

Setting a state to lable the button.
This example is simplified for the tutorail, however,
in reality, you need to subscribe the channel to set the state, 
rather than toggling the boolian variable.
Why? because multiple people may be accessing this UI to control 
your LED on Arduino! So we need to listen all data coming from the
subscribers of the channel!

See: https://codepen.io/girliemac/pen/jqeqje 
for the completed code

var blinkState = true;

Upon a button click, publish the data.
Arduino will subscribe it and blink LED
button.addEventListener('click', function(e) {
    channel: channel, 
    message: {blink: blinkState},
    callback: function(m) {
      blinkState = !blinkState;
      button.textContent = (blinkState) ? 'Blink LED' : 'Stop LED'; 
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