anchor.diff:  
   	<script src="//cdn.bootcss.com/jquery/1.11.3/jquery.min.js"></script>
   	<script src="//cdn.bootcss.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
  +	<script src="https://cdn.jsdelivr.net/sockjs/0.3.4/sockjs.min.js"></script>
  +	<script type="text/javascript">
  +	var ws = null;
  +	function setConnected(connected) {
  +		document.getElementById('connect').disabled = connected;
  +		document.getElementById('disconnect').disabled = !connected;
  +		document.getElementById('echo').disabled = !connected;
  +	}
  +	function connect() {
  +		ws = new SockJS("/echo");
  +		ws.onopen = function () {
  +			setConnected(true);
  +			log('Info: WebSocket connection opened.');
  +		};
  +		ws.onmessage = function (event) {
  +			log('Received: ' + event.data);
  +		};
  +		ws.onclose = function () {
  +			setConnected(false);
  +			log('Info: WebSocket connection closed.');
  +		};
  +	}
  +	function disconnect() {
  +		if (ws != null) {
  +			ws.close();
  +			ws = null;
  +		}
  +		setConnected(false);
  +	}
  +	function echo() {
  +		if (ws != null) {
  +			var message = document.getElementById('message').value;
  +			log('Sent: ' + message);
  +			ws.send(message);
  +		} else {
  +			alert('WebSocket connection not established, please connect.');
  +		}
  +	}
  +	function log(message) {
  +		var console = document.getElementById('console');
  +		var p = document.createElement('p');
  +		p.style.wordWrap = 'break-word';
  +		p.appendChild(document.createTextNode(message));
  +		console.appendChild(p);
  +		while (console.childNodes.length > 25) {
  +			console.removeChild(console.firstChild);
  +		}
  +		console.scrollTop = console.scrollHeight;
  +	}
  +	</script>
   </body>
   </html>
positive.code: <link rel="stylesheet"
  	href="//cdn.bootcss.com/bootstrap/3.3.5/css/bootstrap-theme.min.css">
  </head>
  <body>
  
  	<div class="container-fluid">
  
negative.code: 		<div class="row">
  			<div class="col-md-4"></div>
  			<div class="col-md-4 text-center">
  				<div id="connect-container">
  					<div>
  						<button id="connect" onclick="connect();">Connect</button>
  						<button id="disconnect" disabled="disabled" onclick="disconnect();">Disconnect</button>
  					</div>
  					<div>
  						<textarea id="message" style="width: 350px">Welcome to you!</textarea>
  					</div>
  					<div>
  						<button id="echo" onclick="echo();" disabled="disabled">Send</button>
  					</div>
  				</div>
  				<div id="console-container">
  					<div id="console"></div>
  				</div>
  			</div>
  			<div class="col-md-4"></div>
  		</div>
  