D3 Examples - Caramel slice prototype

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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;top:0;right:0;bottom:0;left:0; }
    
  </style>
</head>
​
<body>
  <script>
    
    var colour = {};
    colour.chocolate = "#8B4513"    // CSS SaddleBrown  
    colour.caramel = "#DAA520"      // CSS GoldenRod 
    colour.base = "#A0522D"             // CSS Sienna
​
    var data = [
      {"id": 1, "base": 10, "caramel": 50, "chocolate": 5, "location": "Cafe X"},
      {"id": 2, "base": 15, "caramel": 45, "chocolate": 2, "location": "Cafe y"},
    ];
    
    data.forEach(function(d){ drawSlice(d.base, d.caramel, d.chocolate); });
    
    function drawSlice(base, caramel, chocolate) {
      
      const margin = {"top": 10, "left": 10, "right": 10, "bottom": 10};
      const width = 100;
      const height = width;
      
      var csHeight = base + caramel + chocolate;
      var csWidth = caramel;
      
      var svg = d3.select("body").append("svg")
      .attr("width", width + margin.left + margin.right)
      .attr("height", height + margin.top + margin.bottom)
      
      var g = svg.append("g")
      .attr("transform", "translate(" + margin.left +"," + margin.top + ")")
      
      var caramelSlice = g.append("g")
      .attr("class", "caramel-slice")
      .attr("transform", "translate(" + ((width - csWidth)/2) +"," + ((height - csHeight)/2) + ")");
      
      caramelSlice.append("rect")
      .attr("class", "chocolate-layer")
      .attr("x", 0)
      .attr("y", 0)
      .attr("width", csWidth)
      .attr("height", chocolate)
      .style("fill", colour.chocolate);
      
      caramelSlice.append("rect")
      .attr("class", "caramel-layer")
      .attr("x", 0)
      .attr("y", chocolate)
      .attr("width", csWidth)
      .attr("height", caramel)
      .style("fill", colour.caramel);
      
      caramelSlice.append("rect")
      .attr("class", "base-layer")
      .attr("x", 0)
      .attr("y", chocolate + caramel)
      .attr("width", csWidth)
      .attr("height", base)
      .style("fill", colour.base);
      
      
    };
​
  </script>
</body>
​
    