D3 Examples - [basic shapes] circle and rectangle (d3 v4)

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <script src="https://d3js.org/d3-selection-multi.v1.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>
​
<body>
  <script>
    var svg = d3.select("body").append("svg")
      .attrs({"width": 960,
                  "height": 500,
              "bgcolor": "black"})
    
    /*
    var background = svg.append("rect")
            .attrs({
          "width": "100%",
          "height": "100%",
          "fill": "black"
        })
        */
​
    var retangulo = svg.append("rect")
            .attrs({
          "x": 480,
          "y": 141,
          "width": 40,
          "height": 30
        })
            .style("fill", "blue");
    var ball = svg.append("circle")
        .attrs({  // provided by selection-multi module
          "r": 73,
          "cx": 480,
          "cy": 250
          })
        .style("fill", "#ffe41e");
    
  </script>
</body>
​
    