D3 Examples - first test

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:auto;display:block;position:absolute;top:0;right:0;bottom:0;left:0; }
    svg {
      margin: auto;
      width: 100%;
      height: 100%;
    }
  </style>
</head>
​
<body>
  <svg>
    <rect />
    <rect />
    <rect />
    <rect />
    <rect />
    <rect />
    <rect />
  </svg>
  <script>
        var rectWidth = 50;
    var height = 500;
    var data = [50, 100, 150, 200, 150, 100, 50];
    
    var rect = d3.selectAll('rect')
        .data(data)
        .attr('x', (d, i) => i * rectWidth)
        .attr('y', d => height - d)
        .attr('width', rectWidth * 0.5)
        .attr('height', d => d * 2)
        .attr('fill', 'black')
        .attr('stroke', '#fff');
  </script>
</body>
    