grouped bar chart

<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  width: 960px;
  height: 500px;
  position: relative;
}

svg {
    width: 100%;
    height: 100%;
    position: center;
}

text{
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}

.toolTip {
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    position: absolute;
    display: none;
    width: auto;
    height: auto;
    background: none repeat scroll 0 0 white;
    border: 0 none;
    border-radius: 8px 8px 8px 8px;
    box-shadow: -3px 3px 15px #888888;
    color: black;
    font: 12px sans-serif;
    padding: 5px;
    text-align: center;
}

.legend {
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 60%;
}

rect {
    stroke-width: 2;
}

text {
  font: 10px sans-serif;
}

.axis text {
  font: 10px sans-serif;
}

.axis path{
  fill: none;
  stroke: #000;
}

.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.axis .tick line {
  stroke-width: 1;
  stroke: rgba(0, 0, 0, 0.2);
}

.axisHorizontal path{
  fill: none;
}

.axisHorizontal line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.axisHorizontal .tick line {
  stroke-width: 1;
  stroke: rgba(0, 0, 0, 0.2);
}

.bar {
  fill: steelblue;
  fill-opacity: .9;
}

.x.axis path {
  display: none;
}

</style>
<body>

var margin = {top: (parseInt(d3.select('body').style('width'), 10)/10), right: (parseInt(d3.select('body').style('width'), 10)/20), bottom: (parseInt(d3.select('body').style('width'), 10)/5), left: (parseInt(d3.select('body').style('width'), 10)/20)},
    width = parseInt(d3.select('body').style('width'), 10) - margin.left - margin.right,
    height = parseInt(d3.select('body').style('height'), 10) - margin.top - margin.bottom;

var x0 = d3.scale.ordinal()
    .rangeRoundBands([0, width], .1);

var x1 = d3.scale.ordinal();

var y = d3.scale.linear()
    .range([height, 0]);

var colorRange = d3.scale.category20();
var color = d3.scale.ordinal()
    .range(colorRange.range());

var xAxis = d3.svg.axis()
    .scale(x0)
    .orient("bottom");

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left")
    .tickFormat(d3.format(".2s"));

var divTooltip = d3.select("body").append("div").attr("class", "toolTip");

var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
    .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

dataset = [
    {label:"Men", "Not Satisfied":20, "Not Much Satisfied":10, "Satisfied": 50, "Very Satisfied":20},
    {label:"Women", "Not Satisfied":15, "Not Much Satisfied":30, "Satisfied":40, "Very Satisfied":15}
];

var options = d3.keys(dataset[0]).filter(function(key) { return key !== "label"; });

dataset.forEach(function(d) {
    d.valores = options.map(function(name) { return {name: name, value: +d[name]}; });
});

x0.domain(dataset.map(function(d) { return d.label; }));
x1.domain(options).rangeRoundBands([0, x0.rangeBand()]);
y.domain([0, d3.max(dataset, function(d) { return d3.max(d.valores, function(d) { return d.value; }); })]);

svg.append("g")
    .attr("class", "x axis")
    .attr("transform", "translate(0," + height + ")")
    .call(xAxis);

svg.append("g")
    .attr("class", "y axis")
    .call(yAxis)
    .append("text")
    .attr("transform", "rotate(-90)")
    .attr("y", 6)
    .attr("dy", ".71em")
    .style("text-anchor", "end")
    .text("Satisfaction %");

var bar = svg.selectAll(".bar")
    .data(dataset)
    .enter().append("g")
    .attr("class", "rect")
    .attr("transform", function(d) { return "translate(" + x0(d.label) + ",0)"; });

bar.selectAll("rect")
    .data(function(d) { return d.valores; })
    .enter().append("rect")
    .attr("width", x1.rangeBand())
    .attr("x", function(d) { return x1(d.name); })
    .attr("y", function(d) { return y(d.value); })
    .attr("value", function(d){return d.name;})
    .attr("height", function(d) { return height - y(d.value); })
    .style("fill", function(d) { return color(d.name); });

bar
    .on("mousemove", function(d){
        divTooltip.style("left", d3.event.pageX+10+"px");
        divTooltip.style("top", d3.event.pageY-25+"px");
        divTooltip.style("display", "inline-block");
        var x = d3.event.pageX, y = d3.event.pageY
        var elements = document.querySelectorAll(':hover');
        l = elements.length
        l = l-1
        elementData = elements[l].__data__
        divTooltip.html((d.label)+"<br>"+elementData.name+"<br>"+elementData.value+"%");
    });
bar
    .on("mouseout", function(d){
        divTooltip.style("display", "none");
    });

var legend = svg.selectAll(".legend")
    .data(options.slice())
    .enter().append("g")
    .attr("class", "legend")
    .attr("transform", function(d, i) { return "translate(0," + i * 20 + ")"; });

legend.append("rect")
    .attr("x", width - 18)
    .attr("width", 18)
    .attr("height", 18)
    .style("fill", color);

legend.append("text")
    .attr("x", width - 24)
    .attr("y", 9)
    .attr("dy", ".35em")
    .style("text-anchor", "end")
    .text(function(d) { return d; });
    
</script>
</body>

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js