D3 Examples - Step 3 - Voronoi Scatterplot - Tooltip attached to circle

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<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
    <title>Scatterplot with Voronoi</title>
​
    <!-- D3.js -->  
    <script src="https://d3js.org/d3.v3.js"></script>
​
    <!-- Pym.js - iframe height handler for the Blog -->
    <script src="pym.min.js"></script>
    
    <!-- jQuery -->
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
    <!-- Latest compiled and minified CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css">
    <!-- Latest compiled and minified JavaScript -->
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js"></script>
    
    <!-- Open Sans & CSS -->
    <link href='https://fonts.googleapis.com/css?family=Open+Sans:700,400,300' rel='stylesheet' type='text/css'>
      <style>
        body {
          font-family: 'Open Sans', sans-serif;
          font-size: 12px;
          font-weight: 400;
          color: #525252;
          text-align: center;
        }
        
        html, body { 
            width:auto; 
            height:auto; 
        }
        
        .axis path,
        .axis line {
            fill: none;
            stroke: #B3B3B3;
            shape-rendering: crispEdges;
        }
        .axis text {
            font-size: 10px;
            fill: #6B6B6B;
        }
        
        .popover {
            pointer-events: none;
        }
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        .legendTitle {
            fill: #1A1A1A;
            color: #1A1A1A;
            text-anchor: middle;
            font-size: 10px;
        }
​
        .legendText {
            fill: #949494;
            text-anchor: start;
            font-size: 9px;
        }
        
        @media (min-width: 500px) {
          .col-sm-3, .col-sm-9 {
            float: left;
          }
          .col-sm-9 {
            width: 75%;
          }
          .col-sm-3 {
            width: 25%;
          }
        }
      </style>
  </head>
  <body>
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    <div id="cont" class="container-fluid text-center">
        <div class="row scatter">
            <h5 style="color: #3B3B3B;">Life expectancy versus GDP per Capita</h5>
            <h6 style="color: #A6A6A6;">Voronoi - Tooltip attached to circles</h6>
            <div class="col-sm-9">
                <div id="chart"></div>
            </div>
            <div id = "legend" class="col-sm-3">
                <div class="legendTitle" style="font-size: 12px;">REGION</div>
                <div id="legend"></div>
            </div>
        </div>
    </div>
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    <script src="worldbank.js"></script>
    <script src="script.js"></script>
    
  </body>
</html>
    