D3 Examples - Hello universe

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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; }
  </style>
</head>
​
<body>
  <svg>
    <circle cx="20" cy="20" r="10" fill="red">
  </svg>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    var data = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]
    var data_points = data.map(x=>[x+50,x*x])
    
    console.log(data_points[0])
    
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)
​
    svg.append("text")
      .text("Hello universe!")
      .attr("y", 200)
      .attr("x", 120)
      .attr("font-size", 28)
      .attr("font-family", "monospace")
    
    svg.selectAll("rect")
      .data(data_points)
        .enter()
        .append("rect")
        .attr("class","green-circle")
        .attr("width", 50)
        .attr("height", 10)
        .attr("x", d=>d[0])
        .attr("y", d=>d[1])
        .attr("fill","steelblue")
        .attr("stroke","black")
​
  </script>
  <p>Something goes here</p>
</body>
​
    