basic d3 bar chart

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v3.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>

var dataset = [ 5, 10, 13, 19, 21, 25, 22, 18, 15, 13,
                11, 12, 15, 20, 18, 17, 16, 18, 23, 25 ];
    
    
//Width and height
var w = 500;
var h = 100;
var barPadding = 1;
    
    
var vscale = d3.scale.linear()
    	.domain([0, d3.max(dataset)])
    	.range([0, h]);

//Create SVG element
var svg = d3.select("body")
            .append("svg")
            .attr("width", w)
            .attr("height", h);
    
svg.selectAll("rect")
   .data(dataset)
   .enter()
   .append("rect")
   .attr("x", function(d, i) {
    return i * (w / dataset.length);
})
   .attr("width", w / dataset.length - barPadding)
  .attr("height", function(d) {
      return vscale(d);  //Just the data value
  })
  .attr("y", function(d) {
      return h - vscale(d);  //Height minus data value
  })

</script>
</body>

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