Real time d3

No style but works fine.

HTML

<body>
    <h4>Animated stacked bar chart</h4>		
</body>

CSS

body {
        font-family: Verdana, sans-serif;
        font-size: 8pt;
        line-height: 12pt;
        background: #ffffff;
        color: #555555;
    }

    .axis path, .axis line {
        fill: none;
        stroke: #555555;
        shape-rendering: crispEdges;
    }
	
    .line {
        fill: none;
        stroke: orange;
        stroke-width: 1px;
    }
	
	.bar {
		stroke: #333333;
		stroke-width: 1px;
		fill: orange;
		shape-rendering: crispEdges;
	}

JavaScript

var t = -1;
    //var v = 0;
	var n = 23; 
    var data = d3.range(23).map(next); 
    
    function getRand(){return Math.floor(Math.random()*20)}
 
    function next () {
        return {
            time: ++t,
            value: d3.range(3).map(getRand)
        };
    }
	
    setInterval(function () {
        data.shift();
        data.push(next());
        redraw();
    }, 1000);	
	
	
    var margin = {top: 20, right: 20, bottom: 30, left: 40},
        width = 560 - margin.left - margin.right,
        height = 300 - margin.top - margin.bottom;

	var x = d3.scale.linear().domain([0, 23]).range([0, width]);
	var y = d3.scale.linear().domain([0, 80]).range([height, 0]);
	
	var barWidth = (width / 23) - 5;
    
    var svg = d3.select("body").append("svg")
			.attr("width", width + margin.left + margin.right)
			.attr("height", height + margin.top + margin.bottom);
			
	var g = svg.append("g")
			.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
	
	var graph = g.append("svg")
				.attr("width", width)
				.attr("height", height + margin.top + margin.bottom);	
	
	var xAxis = d3.svg.axis().scale(x).orient("bottom");
	var axis = graph.append("g")
			.attr("class", "x axis")
			.attr("transform", "translate(0," + height + ")")
			.call(xAxis);

	var yAxis = d3.svg.axis().scale(y).orient("left");
    g.append("g")
        .attr("class", "y axis")
        .call(yAxis);		

	/*graph.selectAll("rect")
        .data(data)
        .enter().append("rect")
            .attr("class", "bar")
            .attr("x", function(d) { return x(d.time); })
            .attr("width", barWidth) 
            .attr("y", function(d) { return y(d.value); })
            .attr("height", function(d) { return (height - y(d.value)); });	
	*/

  var color = d3.scale.ordinal()
    .range(["#98abc5", "#8a89a6", "#7b6888", "#6b486b", "#a05d56", "#d0743c", "#ff8c00"])
    .domain([0, data[0].lenght])
  


    function redraw()
    {
      customData = data.map(function(d){
     ...