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HTML 

              
                <html>
<title>PubNub ChatEngine</title>

<head>
    <link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.4.0/css/font-awesome.min.css"></link>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/handlebars.js/3.0.0/handlebars.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/list.js/1.1.1/list.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/chat-engine@0.8.4/dist/chat-engine.min.js" type="text/javascript"></script>
</head>

<body>
    <audio id="audioElement" style="display: none;"></audio>
    <div class="container clearfix">
        <div class="people-list" id="people-list">
            <ul class="list">
            </ul>
        </div>
        <div class="chat">
            <div class="chat-header clearfix">
                <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/195612/chat_avatar_01_green.jpg" alt="avatar" />
                <div class="chat-about">
                    <div class="chat-with">ChatEngine Demo Chat</div>
                </div>
            </div>
            <div class="chat-history">
                <ul></ul>
            </div>
            <form id="sendMessage" class="chat-message clearfix">
                <input type="text" name="message-to-send" id="message-to-send" placeholder="Type your message" rows="1"></input>
                <input type="submit" value="Send"></input>
            </form>
            <!-- end chat-message -->
        </div>
        <!-- end chat -->
    </div>
    <!-- end container -->
    
    <script id="message-template" type="text/x-handlebars-template">
        <li class="clearfix">
            <div class="message-data align-right">
                <span class="message-data-time">{{time}}, Today</span> &nbsp; &nbsp;
                <span class="message-data-name">{{user.first}}</span> <i class="fa fa-circle me"></i>
            </div>
            <div class="message other-message float-right">
                <button class="polly" data-text="{{messageOutput}}" onclick="textToSpeech(this)"></button>
                {{messageOutput}}
            </div>
        </li>
    </script>
    <script id="message-response-template" type="text/x-handlebars-template">
        <li>
            <div class="message-data">
                <span class="message-data-name"><i class="fa fa-circle online"></i> {{user.first}}</span>
                <span class="message-data-time">{{time}}, Today</span>
            </div>
            <div class="message my-message">
                <button class="polly" data-text="{{messageOutput}}" onclick="textToSpeech(this)"></button>
                {{messageOutput}}
            </div>
        </li>
    </script>
    <script id="person-template" type="text/x-handlebars-template">
        {{#if state.full}}
        <li class="clearfix" id="{{uuid}}">
            <img src="{{state.avatar}}" alt="avatar" />
            <div class="about">
                <div class="name">{{state.full}}</div>
                <div class="status">
                    <i class="fa fa-circle online"></i> online
                </div>
            </div>
        </li>
        {{/if}}
    </script>
  
</body>

</html>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Lato:400,700);

$green: #86BB71;
$blue: #94C2ED;
$orange: #E38968;
$gray: #92959E;

*, *:before, *:after {
  box-sizing: border-box;
}

body {
  background: #C5DDEB;
  font: 14px/20px "Lato", Arial, sans-serif;
  padding: 20px 0;
  color: white;
}

.container {
  margin: 0 auto;
  width: 750px;
  background: #444753;
  border-radius: 5px;
}

.people-list {
  width:260px;
  float: left;
  overflow-y: auto; 
  max-height: 532px;
  .search {
    padding: 20px;
  }
  
  input {
    border-radius: 3px;
    border: none;
    padding: 14px;
    color: white;
    background: #6A6C75;
    width: 90%;
    font-size: 14px;
  }
  
  .fa-search {
    position: relative;
    left: -25px;
  }
  
  ul {
    padding: 20px;
    height: 500px;
 
    
    
    
    li {
      padding-bottom: 20px;
    }
  }
  
  img {
    float: left;
  }
  
  .about {
    float: left;
    margin-top: 8px;
  }
  
  .about {
    padding-left: 8px;
  }
  
  .status {
    color: $gray;
  }
  
}

.chat {
  width: 490px;
  float:left;
  background: #F2F5F8;
  border-top-right-radius: 5px;
  border-bottom-right-radius: 5px;
  
  color: #434651;
  
  .chat-header {
    padding: 20px;
    border-bottom: 2px solid white;
    
    img {
      float: left;
    }
    
    .chat-about {
      float: left;
      padding-left: 10px;
      margin-top: 6px;
    }
    
    .chat-with {
      font-weight: bold;
      font-size: 16px;
    }
    
    .chat-num-messages {
      color: $gray;
    }
    
    .fa-star {
      float: right;
      color: #D8DADF;
      font-size: 20px;
      margin-top: 12px;
    }
  }
  
  .chat-history {
    padding: 30px 30px 20px;
    border-bottom: 2px solid white;
    overflow-y: scroll;
    height: 300px;
    
    .message-data {
      margin-bottom: 15px;
    }
    
    .message-data-time {
      color: lighten($gray, 8%);
      padding-left: 6px;
    }
    
    .message {      
      color: white;
      padding: 8px 10px;
      line-height: 26px;
      font-size: 16px;
      border-radius: 7px;
      margin-bottom: 15px;
      width: 90%;
      position: relative;
      
      &:after {
        bottom: 100%;
        left: 7%;
        border: solid transparent;
        content: " ";
        height: 0;
        width: 0;
        position: absolute;
        pointer-events: none;
        border-bottom-color: $green;
        border-width: 10px;
        margin-left: -10px;
      }
    }
    
    .my-message {
      background: $green;
    }
    
    .other-message {
      background: $blue;
      
      &:after {
        border-bottom-color: $blue;
        left: 93%;
      }
    }
    
  }
  
  .chat-message {
    padding: 30px;
    
    input[type="text"] {
      width: 100%;
      border: none;
      padding: 10px 20px;
      font: 14px/22px "Lato", Arial, sans-serif;
      margin-bottom: 10px;
      border-radius: 5px;
      resize: none;
      background-color: #fff;
    }
    
    .fa-file-o, .fa-file-image-o {
      font-size: 16px;
      color: gray;
      cursor: pointer;
      
    }
    
    input[type="submit"] {
      float: right;
      color: $blue;
      font-size: 16px;
      text-transform: uppercase;
      border: none;
      cursor: pointer;
      font-weight: bold;
      background: #F2F5F8;
      
      &:hover {
        color: darken($blue, 7%);
      }
    }
  }
}

.online, .offline, .me {
    margin-right: 3px;
    font-size: 10px;
  }
  
.online {
  color: $green;
}
  
.offline {
  color: $orange;
}

.me {
  color: $blue;
}

.align-left {
  text-align: left;
}

.align-right {
  text-align: right;
}

.float-right {
  float: right;
}

.clearfix:after {
	visibility: hidden;
	display: block;
	font-size: 0;
	content: " ";
	clear: both;
	height: 0;
}

.chat .chat-history .polly {
  width: 25px;
  height: 25px;
  margin-right: 6px;
  background-color: #FFFFFF;
  border-radius: 50%;
  border: solid 1px #404040;
  vertical-align: top;
  outline: none;
  cursor: pointer;
  background-image: url("data:image/svg+xml;base64,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");
}
!

JS 

              
                // Setup Chat
ChatEngine = ChatEngineCore.create({
    publishKey: 'pub-c-c15809de-713c-4e15-b53d-a37e5af52e6c',
    subscribeKey: 'sub-c-6a9e7a02-32d1-11e8-a385-722195e66eb1'
});

const pollyFunctionURI = "https://pubsub.pubnub.com/v1/blocks/sub-key/sub-c-6a9e7a02-32d1-11e8-a385-722195e66eb1/polly-endpoint";

const source_language = "en";
const target_language = "es";

// use a helper function to generate a new profile
let newPerson = generatePerson(true);

// create a bucket to store our ChatEngine Chat object
let myChat;

// create a bucket to store 
let me;

// compile handlebars templates and store them for use later
let peopleTemplate = Handlebars.compile($("#person-template").html());
let meTemplate = Handlebars.compile($("#message-template").html());
let userTemplate = Handlebars.compile($("#message-response-template").html());

// this is our main function that starts our chat app
const init = () => {
  
  // connect to ChatEngine with our generated user
  ChatEngine.connect(newPerson.uuid, newPerson);

  // when ChatEngine is booted, it returns your new User as `data.me`
  ChatEngine.on('$.ready', function(data) {

      // store my new user as `me`
      me = data.me;

      // create a new ChatEngine Chat
      myChat = new ChatEngine.Chat('chatengine-demo-chat');

      // when we recieve messages in this chat, render them
      myChat.on('message', (message) => {
          renderMessage(message);
      });

      // when a user comes online, render them in the online list
      myChat.on('$.online.*', (data) => {   
        $('#people-list ul').append(peopleTemplate(data.user));
      });

      // when a user goes offline, remove them from the online list
      myChat.on('$.offline.*', (data) => {
        $('#people-list ul').find('#' + data.user.uuid).remove();
      });

      // wait for our chat to be connected to the internet
      myChat.on('$.connected', () => {

          // search for 50 old `message` events
          myChat.search({
            event: 'message',
            limit: 50
          }).on('message', (data) => {
            
            console.log(data)
            
            // when messages are returned, render them like normal messages
            renderMessage(data, true);
            
          });
        
      });

      // bind our "send" button and return key to send message
      $('#sendMessage').on('submit', sendMessage)

  });

};

// send a message to the Chat
const sendMessage = () => {

    // get the message text from the text input
    let message = $('#message-to-send').val().trim();
  
    // if the message isn't empty
    if (message.length) {
      
        // emit the `message` event to everyone in the Chat
        myChat.emit( 'message', {
            text: message,
            translate: {
                text: message,
                source: source_language,
                target: target_language
            }
        } );

        // clear out the text input
        $('#message-to-send').val('');
    }
    
    // stop form submit from bubbling
    return false;
  
};

// render messages in the list
const renderMessage = (message, isHistory = false) => {

    // use the generic user template by default
    let template = userTemplate;

    // if I happened to send the message, use the special template for myself
    if (message.sender.uuid == me.uuid) {
        template = meTemplate;
    }

    let el = template({
        messageOutput: message.data.text,
        time: getCurrentTime(),
        user: message.sender.state
    });
  
    // render the message
    if(isHistory) {
      $('.chat-history ul').prepend(el); 
    } else {
      $('.chat-history ul').append(el); 
    }
  
    // scroll to the bottom of the chat
    scrollToBottom();

};

// scroll to the bottom of the window
const scrollToBottom = () => {
    $('.chat-history').scrollTop($('.chat-history')[0].scrollHeight);
};

// get the current time in a nice format
const getCurrentTime = () => {
    return new Date().toLocaleTimeString().replace(/([\d]+:[\d]{2})(:[\d]{2})(.*)/, "$1$3");
};

function play(audioDataURI){
  console.log(audioDataURI);
  let $audioElement = $('#audioElement');
  $audioElement.attr( 'src', audioDataURI );
  $audioElement.trigger('play');
}

function textToSpeech(e) {
  console.log($(e.target).html());  
  if (e.dataset.voiceAudioContent) {
    return play(e.dataset.voiceAudioContent);
  }

  $.ajax({
    method: "POST",
    url: pollyFunctionURI,
    data: JSON.stringify({
      "data": {
        "text": e.dataset.text,
        "polly": {
          "voice": "Miguel",
          "format": "mp3",
          "location": "text"
        }
      }
    })
  }).done(function(res) {
    e.dataset.voiceAudioContent = 'data:audio/mp3;base64,' + res.polly_sound;
    play(e.dataset.voiceAudioContent);
  });
}

// boot the app
init();
!
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Console