d3-fun

<!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; }
    * {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
      }

body {
        height: 100vh;
        width: 100vw;
      }

svg {
        height: 100%;
        width: 100%;
      }
  </style>
</head>

<body>
  <svg>
  </svg>
  <script>
    var rectWidth = 50;
    var height = 600;
    var data = [100, 250, 175, 200, 120, 140, 500];

https://d3js.org/d3.v4.min.js