D3 Scatterplot

<!DOCTYPE html>
<html>
<meta charset="utf-8">

.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.dot {
  stroke: #000;
}

.tooltip {
  position: absolute;
  width: 200px;
  height: 28px;
  pointer-events: none;
}
</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>

/* 
 * value accessor - returns the value to encode for a given data object.
 * scale - maps value to a visual display encoding, such as a pixel position.
 * map function - maps from data value to display value
 * axis - sets up axis
 */

// setup x 
var xValue = function(d) { return d.Calories;}, // data -> value
    xScale = d3.scale.linear().range([0, width]), // value -> display
    xMap = function(d) { return xScale(xValue(d));}, // data -> display
    xAxis = d3.svg.axis().scale(xScale).orient("bottom");

// setup y
var yValue = function(d) { return d["Protein (g)"];}, // data -> value
    yScale = d3.scale.linear().range([height, 0]), // value -> display
    yMap = function(d) { return yScale(yValue(d));}, // data -> display
    yAxis = d3.svg.axis().scale(yScale).orient("left");

// setup fill color
var cValue = function(d) { return d.Manufacturer;},
    color = d3.scale.category10();

// add the graph canvas to the body of the webpage
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 + ")");

// add the tooltip area to the webpage
var tooltip = d3.select("body").append("div")
    .attr("class", "tooltip")
    .style("opacity", 0);

// load data
//d3.csv("cereal.csv", function(error, data) {
var data = [
  {
    "Cereal Name": "100%_Bran",
    "Manufacturer": "Nabisco",
    "Type": "C",
    "Calories": 70,
    "Protein (g)": 4,
    "Fat": 1,
    "Sodium": 130,
    "Dietary Fiber": 10,
    "Carbs": 5,
    "Sugars": 6,
    "Display Shelf": 3,
    "Potassium": 280,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 0.33
  },
  {
    "Cereal Name": "100%_Natural_Bran",
    "Manufacturer": "Quaker Oats",
    "Type": "C",
    "Calories": 120,
    "Protein (g)": 3,
    "Fat": 5,
    "Sodium": 15,
    "Dietary Fiber": 2,
    "Carbs": 8,
    "Sugars": 8,
    "Display Shelf": 3,
    "Potassium": 135,
    "Vitamins and Minerals": 0,
    "Serving Size Weight": 1,
    "Cups per Serving": -1
  },
  {
    "Cereal Name": "All-Bran",
    "Manufacturer": "Kelloggs",
    "Type": "C",
    "Calories": 70,
    "Protein (g)": 4,
    "Fat": 1,
    "Sodium": 260,
    "Dietary Fiber": 9,
    "Carbs": 7,
    "Sugars": 5,
    "Display Shelf": 3,
    "Potassium": 320,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 0.33
  },
  {
    "Cereal Name": "All-Bran_with_Extra_Fiber",
    "Manufacturer": "Kelloggs",
    "Type": "C",
    "Calories": 50,
    "Protein (g)": 4,
    "Fat": 0,
    "Sodium": 140,
    "Dietary Fiber": 14,
    "Carbs": 8,
    "Sugars": 0,
    "Display Shelf": 3,
    "Potassium": 330,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 0.5
  },
  {
    "Cereal Name": "Almond_Delight",
    "Manufacturer": "Ralston Purina",
    "Type": "C",
    "Calories": 110,
    "Protein (g)": 2,
    "Fat": 2,
    "Sodium": 200,
    "Dietary Fiber": 1,
    "Carbs": 14,
    "Sugars": 8,
    "Display Shelf": 3,
    "Potassium": -1,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 0.75
  },
  {
    "Cereal Name": "Apple_Cinnamon_Cheerios",
    "Manufacturer": "General Mills",
    "Type": "C",
    "Calories": 110,
    "Protein (g)": 2,
    "Fat": 2,
    "Sodium": 180,
    "Dietary Fiber": 1.5,
    "Carbs": 10.5,
    "Sugars": 10,
    "Display Shelf": 1,
    "Potassium": 70,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 0.75
  },
  {
    "Cereal Name": "Apple_Jacks",
    "Manufacturer": "Kelloggs",
    "Type": "C",
    "Calories": 110,
    "Protein (g)": 2,
    "Fat": 0,
    "Sodium": 125,
    "Dietary Fiber": 1,
    "Carbs": 11,
    "Sugars": 14,
    "Display Shelf": 2,
    "Potassium": 30,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 1
  },
  {
    "Cereal Name": "Basic_4",
    "Manufacturer": "General Mills",
    "Type": "C",
    "Calories": 130,
    "Protein (g)": 3,
    "Fat": 2,
    "Sodium": 210,
    "Dietary Fiber": 2,
    "Carbs": 18,
    "Sugars": 8,
    "Display Shelf": 3,
    "Potassium": 100,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1.33,
    "Cups per Serving": 0.75
  },
  {
    "Cereal Name": "Bran_Chex",
    "Manufacturer": "Ralston Purina",
    "Type": "C",
    "Calories": 90,
    "Protein (g)": 2,
    "Fat": 1,
    "Sodium": 200,
    "Dietary Fiber": 4,
    "Carbs": 15,
    "Sugars": 6,
    "Display Shelf": 1,
    "Potassium": 125,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 0.67
  },
  {
    "Cereal Name": "Bran_Flakes",
    "Manufacturer": "Post",
    "Type": "C",
    "Calories": 90,
    "Protein (g)": 3,
    "Fat": 0,
    "Sodium": 210,
    "Dietary Fiber": 5,
    "Carbs": 13,
    "Sugars": 5,
    "Display Shelf": 3,
    "Potassium": 190,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 0.67
  },
  {
    "Cereal Name": "Cap'n'Crunch",
    "Manufacturer": "Quaker Oats",
    "Type": "C",
    "Calories": 120,
    "Protein (g)": 1,
    "Fat": 2,
    "Sodium": 220,
    "Dietary Fiber": 0,
    "Carbs": 12,
    "Sugars": 12,
    "Display Shelf": 2,
    "Potassium": 35,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 0.75
  },
  {
    "Cereal Name": "Cheerios",
    "Manufacturer": "General Mills",
    "Type": "C",
    "Calories": 110,
    "Protein (g)": 6,
    "Fat": 2,
    "Sodium": 290,
    "Dietary Fiber": 2,
    "Carbs": 17,
    "Sugars": 1,
    "Display Shelf": 1,
    "Potassium": 105,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 1.25
  },
  {
    "Cereal Name": "Cinnamon_Toast_Crunch",
    "Manufacturer": "General Mills",
    "Type": "C",
    "Calories": 120,
    "Protein (g)": 1,
    "Fat": 3,
    "Sodium": 210,
    "Dietary Fiber": 0,
    "Carbs": 13,
    "Sugars": 9,
    "Display Shelf": 2,
    "Potassium": 45,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 0.75
  },
  {
    "Cereal Name": "Clusters",
    "Manufacturer": "General Mills",
    "Type": "C",
    "Calories": 110,
    "Protein (g)": 3,
    "Fat": 2,
    "Sodium": 140,
    "Dietary Fiber": 2,
    "Carbs": 13,
    "Sugars": 7,
    "Display Shelf": 3,
    "Potassium": 105,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 0.5
  },
  {
    "Cereal Name": "Cocoa_Puffs",
    "Manufacturer": "General Mills",
    "Type": "C",
    "Calories": 110,
    "Protein (g)": 1,
    "Fat": 1,
    "Sodium": 180,
    "Dietary Fiber": 0,
    "Carbs": 12,
    "Sugars": 13,
    "Display Shelf": 2,
    "Potassium": 55,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 1
  },
  {
    "Cereal Name": "Corn_Chex",
    "Manufacturer": "Ralston Purina",
    "Type": "C",
    "Calories": 110,
    "Protein (g)": 2,
    "Fat": 0,
    "Sodium": 280,
    "Dietary Fiber": 0,
    "Carbs": 22,
    "Sugars": 3,
    "Display Shelf": 1,
    "Potassium": 25,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 1
  },
  {
    "Cereal Name": "Corn_Flakes",
    "Manufacturer": "Kelloggs",
    "Type": "C",
    "Calories": 100,
    "Protein (g)": 2,
    "Fat": 0,
    "Sodium": 290,
    "Dietary Fiber": 1,
    "Carbs": 21,
    "Sugars": 2,
    "Display Shelf": 1,
    "Potassium": 35,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 1
  },
  {
    "Cereal Name": "Corn_Pops",
    "Manufacturer": "Kelloggs",
    "Type": "C",
    "Calories": 110,
    "Protein (g)": 1,
    "Fat": 0,
    "Sodium": 90,
    "Dietary Fiber": 1,
    "Carbs": 13,
    "Sugars": 12,
    "Display Shelf": 2,
    "Potassium": 20,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 1
  },
  {
    "Cereal Name": "Count_Chocula",
    "Manufacturer": "General Mills",
    "Type": "C",
    "Calories": 110,
    "Protein (g)": 1,
    "Fat": 1,
    "Sodium": 180,
    "Dietary Fiber": 0,
    "Carbs": 12,
    "Sugars": 13,
    "Display Shelf": 2,
    "Potassium": 65,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 1
  },
  {
    "Cereal Name": "Cracklin'_Oat_Bran",
    "Manufacturer": "Kelloggs",
    "Type": "C",
    "Calories": 110,
    "Protein (g)": 3,
    "Fat": 3,
    "Sodium": 140,
    "Dietary Fiber": 4,
    "Carbs": 10,
    "Sugars": 7,
    "Display Shelf": 3,
    "Potassium": 160,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 0.5
  },
  {
    "Cereal Name": "Cream_of_Wheat_(Quick)",
    "Manufacturer": "Nabisco",
    "Type": "H",
    "Calories": 100,
    "Protein (g)": 3,
    "Fat": 0,
    "Sodium": 80,
    "Dietary Fiber": 1,
    "Carbs": 21,
    "Sugars": 0,
    "Display Shelf": 2,
    "Potassium": -1,
    "Vitamins and Minerals": 0,
    "Serving Size Weight": 1,
    "Cups per Serving": 1
  },
  {
    "Cereal Name": "Crispix",
    "Manufacturer": "Kelloggs",
    "Type": "C",
    "Calories": 110,
    "Protein (g)": 2,
    "Fat": 0,
    "Sodium": 220,
    "Dietary Fiber": 1,
    "Carbs": 21,
    "Sugars": 3,
    "Display Shelf": 3,
    "Potassium": 30,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 1
  },
  {
    "Cereal Name": "Crispy_Wheat_&_Raisins",
    "Manufacturer": "General Mills",
    "Type": "C",
    "Calories": 100,
    "Protein (g)": 2,
    "Fat": 1,
    "Sodium": 140,
    "Dietary Fiber": 2,
    "Carbs": 11,
    "Sugars": 10,
    "Display Shelf": 3,
    "Potassium": 120,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 0.75
  },
  {
    "Cereal Name": "Double_Chex",
    "Manufacturer": "Ralston Purina",
    "Type": "C",
    "Calories": 100,
    "Protein (g)": 2,
    "Fat": 0,
    "Sodium": 190,
    "Dietary Fiber": 1,
    "Carbs": 18,
    "Sugars": 5,
    "Display Shelf": 3,
    "Potassium": 80,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 0.75
  },
  {
    "Cereal Name": "Froot_Loops",
    "Manufacturer": "Kelloggs",
    "Type": "C",
    "Calories": 110,
    "Protein (g)": 2,
    "Fat": 1,
    "Sodium": 125,
    "Dietary Fiber": 1,
    "Carbs": 11,
    "Sugars": 13,
    "Display Shelf": 2,
    "Potassium": 30,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 1
  },
  {
    "Cereal Name": "Frosted_Flakes",
    "Manufacturer": "Kelloggs",
    "Type": "C",
    "Calories": 110,
    "Protein (g)": 1,
    "Fat": 0,
    "Sodium": 200,
    "Dietary Fiber": 1,
    "Carbs": 14,
    "Sugars": 11,
    "Display Shelf": 1,
    "Potassium": 25,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 0.75
  },
  {
    "Cereal Name": "Frosted_Mini-Wheats",
    "Manufacturer": "Kelloggs",
    "Type": "C",
    "Calories": 100,
    "Protein (g)": 3,
    "Fat": 0,
    "Sodium": 0,
    "Dietary Fiber": 3,
    "Carbs": 14,
    "Sugars": 7,
    "Display Shelf": 2,
    "Potassium": 100,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 0.8
  },
  {
    "Cereal Name": "Fruitful_Bran",
    "Manufacturer": "Kelloggs",
    "Type": "C",
    "Calories": 120,
    "Protein (g)": 3,
    "Fat": 0,
    "Sodium": 240,
    "Dietary Fiber": 5,
    "Carbs": 14,
    "Sugars": 12,
    "Display Shelf": 3,
    "Potassium": 190,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1.33,
    "Cups per Serving": 0.67
  },
  {
    "Cereal Name": "Fruity_Pebbles",
    "Manufacturer": "Post",
    "Type": "C",
    "Calories": 110,
    "Protein (g)": 1,
    "Fat": 1,
    "Sodium": 135,
    "Dietary Fiber": 0,
    "Carbs": 13,
    "Sugars": 12,
    "Display Shelf": 2,
    "Potassium": 25,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 0.75
  },
  {
    "Cereal Name": "Golden_Crisp",
    "Manufacturer": "Post",
    "Type": "C",
    "Calories": 100,
    "Protein (g)": 2,
    "Fat": 0,
    "Sodium": 45,
    "Dietary Fiber": 0,
    "Carbs": 11,
    "Sugars": 15,
    "Display Shelf": 1,
    "Potassium": 40,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 0.88
  },
  {
    "Cereal Name": "Golden_Grahams",
    "Manufacturer": "General Mills",
    "Type": "C",
    "Calories": 110,
    "Protein (g)": 1,
    "Fat": 1,
    "Sodium": 280,
    "Dietary Fiber": 0,
    "Carbs": 15,
    "Sugars": 9,
    "Display Shelf": 2,
    "Potassium": 45,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 0.75
  },
  {
    "Cereal Name": "Grape_Nuts_Flakes",
    "Manufacturer": "Post",
    "Type": "C",
    "Calories": 100,
    "Protein (g)": 3,
    "Fat": 1,
    "Sodium": 140,
    "Dietary Fiber": 3,
    "Carbs": 15,
    "Sugars": 5,
    "Display Shelf": 3,
    "Potassium": 85,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 0.88
  },
  {
    "Cereal Name": "Grape-Nuts",
    "Manufacturer": "Post",
    "Type": "C",
    "Calories": 110,
    "Protein (g)": 3,
    "Fat": 0,
    "Sodium": 170,
    "Dietary Fiber": 3,
    "Carbs": 17,
    "Sugars": 3,
    "Display Shelf": 3,
    "Potassium": 90,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 0.25
  },
  {
    "Cereal Name": "Great_Grains_Pecan",
    "Manufacturer": "Post",
    "Type": "C",
    "Calories": 120,
    "Protein (g)": 3,
    "Fat": 3,
    "Sodium": 75,
    "Dietary Fiber": 3,
    "Carbs": 13,
    "Sugars": 4,
    "Display Shelf": 3,
    "Potassium": 100,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 0.33
  },
  {
    "Cereal Name": "Honey_Graham_Ohs",
    "Manufacturer": "Quaker Oats",
    "Type": "C",
    "Calories": 120,
    "Protein (g)": 1,
    "Fat": 2,
    "Sodium": 220,
    "Dietary Fiber": 1,
    "Carbs": 12,
    "Sugars": 11,
    "Display Shelf": 2,
    "Potassium": 45,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 1
  },
  {
    "Cereal Name": "Honey_Nut_Cheerios",
    "Manufacturer": "General Mills",
    "Type": "C",
    "Calories": 110,
    "Protein (g)": 3,
    "Fat": 1,
    "Sodium": 250,
    "Dietary Fiber": 1.5,
    "Carbs": 11.5,
    "Sugars": 10,
    "Display Shelf": 1,
    "Potassium": 90,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 0.75
  },
  {
    "Cereal Name": "Honey-comb",
    "Manufacturer": "Post",
    "Type": "C",
    "Calories": 110,
    "Protein (g)": 1,
    "Fat": 0,
    "Sodium": 180,
    "Dietary Fiber": 0,
    "Carbs": 14,
    "Sugars": 11,
    "Display Shelf": 1,
    "Potassium": 35,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 1.33
  },
  {
    "Cereal Name": "Just_Right_Crunchy__Nuggets",
    "Manufacturer": "Kelloggs",
    "Type": "C",
    "Calories": 110,
    "Protein (g)": 2,
    "Fat": 1,
    "Sodium": 170,
    "Dietary Fiber": 1,
    "Carbs": 17,
    "Sugars": 6,
    "Display Shelf": 3,
    "Potassium": 60,
    "Vitamins and Minerals": 100,
    "Serving Size Weight": 1,
    "Cups per Serving": -1
  },
  {
    "Cereal Name": "Just_Right_Fruit_&_Nut",
    "Manufacturer": "Kelloggs",
    "Type": "C",
    "Calories": 140,
    "Protein (g)": 3,
    "Fat": 1,
    "Sodium": 170,
    "Dietary Fiber": 2,
    "Carbs": 20,
    "Sugars": 9,
    "Display Shelf": 3,
    "Potassium": 95,
    "Vitamins and Minerals": 100,
    "Serving Size Weight": 1.3,
    "Cups per Serving": 0.75
  },
  {
    "Cereal Name": "Kix",
    "Manufacturer": "General Mills",
    "Type": "C",
    "Calories": 110,
    "Protein (g)": 2,
    "Fat": 1,
    "Sodium": 260,
    "Dietary Fiber": 0,
    "Carbs": 21,
    "Sugars": 3,
    "Display Shelf": 2,
    "Potassium": 40,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 1.5
  },
  {
    "Cereal Name": "Life",
    "Manufacturer": "Quaker Oats",
    "Type": "C",
    "Calories": 100,
    "Protein (g)": 4,
    "Fat": 2,
    "Sodium": 150,
    "Dietary Fiber": 2,
    "Carbs": 12,
    "Sugars": 6,
    "Display Shelf": 2,
    "Potassium": 95,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 0.67
  },
  {
    "Cereal Name": "Lucky_Charms",
    "Manufacturer": "General Mills",
    "Type": "C",
    "Calories": 110,
    "Protein (g)": 2,
    "Fat": 1,
    "Sodium": 180,
    "Dietary Fiber": 0,
    "Carbs": 12,
    "Sugars": 12,
    "Display Shelf": 2,
    "Potassium": 55,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": 1
  },
  {
    "Cereal Name": "Maypo",
    "Manufacturer": "American Home Food Products",
    "Type": "H",
    "Calories": 100,
    "Protein (g)": 4,
    "Fat": 1,
    "Sodium": 0,
    "Dietary Fiber": 0,
    "Carbs": 16,
    "Sugars": 3,
    "Display Shelf": 2,
    "Potassium": 95,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1,
    "Cups per Serving": -1
  },
  {
    "Cereal Name": "Mueslix_Crispy_Blend",
    "Manufacturer": "Kelloggs",
    "Type": "C",
    "Calories": 160,
    "Protein (g)": 3,
    "Fat": 2,
    "Sodium": 150,
    "Dietary Fiber": 3,
    "Carbs": 17,
    "Sugars": 13,
    "Display Shelf": 3,
    "Potassium": 160,
    "Vitamins and Minerals": 25,
    "Serving Size Weight": 1.5,
    "Cups per Serving": 0.67
  },
  {
    "Cereal Name": "Multi-Grain_Cheerios",
    "Manufacturer": "General Mills",
    "Type": "C",
    "Calories": 100,
    "Protein (g)": 2,
    "Fat": 1,
    "Sodium": 220,
    "Dietary Fiber": 2,
    "Carbs": 15,
    "Sugars": 6,
    "Display Shelf": 1,
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    "Cereal Name": "Raisin_Nut_Bran",
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    "Cereal Name": "Raisin_Squares",
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    "Cereal Name": "Wheat_Chex",
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    "Cereal Name": "Wheaties",
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    "Cereal Name": "Wheaties_Honey_Gold",
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];
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  data.forEach(function(d) {
    d.Calories = +d.Calories;
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//    console.log(d);
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// x-axis
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      .call(xAxis)
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      .attr("x", width)
      .attr("y", -6)
      .style("text-anchor", "end")
      .text("Calories");

// y-axis
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      .call(yAxis)
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      .attr("class", "label")
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      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
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// draw dots
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               .style("opacity", .9);
          tooltip.html(d["Cereal Name"] + "<br/> (" + xValue(d) 
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               .style("left", (d3.event.pageX + 5) + "px")
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// draw legend
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    .enter().append("g")
      .attr("class", "legend")
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// draw legend colored rectangles
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      .attr("width", 18)
      .attr("height", 18)
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// draw legend text
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      .attr("dy", ".35em")
      .style("text-anchor", "end")
      .text(function(d) { return d;})
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</body>
</html>

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js