training

<!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; }
    rect { fill: none; stroke: black; }
    .line {
      fill: none;
      stroke: steelblue;
      stroke-width: 1.5px;
    }
  </style>
</head>

<body>
  <script>
  // set the dimensions and margins of the graph
var margin = {top: 20, right: 20, bottom: 30, left: 50},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
    // set the ranges
    var x = d3.scaleLinear().range([0, width]);
    var y = d3.scaleLinear().range([height, 0]);
   var points = [
    { x: 10,  y: 10  },
    { x: 200, y: 200 },
    { x: 200, y: 400 },
    { x: 300, y: 100 },
    { x: 400, y: 150 }
  ]
   // define the line
var valueline = d3.line()
    .x(function(d) { return x(d.x); })
    .y(function(d) { return y(d.y); });
    
    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 + ")");
    
    // Get the data
    d3.data(points);
  </script>
</body>

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