D3 Examples - d3 vertical bar graph

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    #chart {
      shape-rendering: crispEdges;
      display: block;
        margin: 0 auto;
            margin-top: 100px;
    }
  </style>
</head>
<body>
  <script>
    const data = [100, 200, 175, 200, 120];
    const w = 350;
    const h = 250;
    
    const x = d3.scaleLinear()
                                .domain([0, data.length])
                            .range([0, w]);
    
    const y = d3.scaleLinear()
                            .domain([0, d3.max(data)])
                            .range([0, h]);
    
    const svg = d3.select('body')
                            .append('svg')
                            .attr('id', 'chart')
                            .attr('width', w)
                            .attr('height', h);
    
    svg.selectAll('.bar')
         .data(data).enter()
         .append('rect')
         .classed('.bar', true)
         .attr('x', (d, i) => x(i))
         .attr('y', d => h - y(d))
         .attr('width', x(1) - 2)
         .attr('height', d => y(d))
         .attr('fill', 'steelblue')
         .attr('stroke', 'black');
    
  </script>
</body>
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