D3 Examples - Dot Map

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<!DOCTYPE HTML>
<meta charset="utf-8">
<html>
<head>
​
<link rel="stylesheet" type="text/css" href="https://fonts.googleapis.com/css?family=Source+Sans+Pro:400italic,600italic,700italic,200,300,400,600,700,900">
<script src="https://d3js.org/d3.v3.min.js"></script>
​
<style>
​
body, h1, h2, h3, p {
  margin: 0;
  padding: 0;
  font-family: 'Source Sans Pro', sans-serif;
  font-size: 1em;
  color: #333;
  font-weight: 400;
}
​
#content {
  margin: 5px;
  padding: 20px;
  width: 805px;
  border: 1px solid #ccc;
}
​
#map {
  margin: 10px 0px 0px 0px;
  padding: 0px;
}
​
h1, h2 {
  line-height: 1em;
  font-size: 1.75em;
  font-weight: 900;
  color: #000;
}
​
h2.year, h2.count {
  margin: 5px 0px 0px 0px;
  font-size: 1.3em;
  font-weight: 700;
}
​
p {
  margin: 10px 0px 0px 0px;
}
​
input {
  display: block;
  width: 200px;
  margin: 10px 0px 0px 0px;
}
​
.states {
  fill: #f5eede;
  stroke: #fff;
  stroke-width: 2;
  stroke-linejoin: round;
}
​
.openings {
  fill: #f5eede;
  stroke: #8D0600;
  stroke-width: 2;
}
​
.openings:hover {
  fill: #8D0600;
}
​
.locations{
  fill: #f5eede;
  stroke: #C0392B;
  stroke-width: 1;
  opacity: 0.7;
}
​
.tooltip {
  position: absolute;
  padding: 7px;
  font-size: 0.9em;
  pointer-events: none;
  background: #fff;
  border: 1px solid #ccc;
  border-radius: 4px;
​
  -moz-box-shadow:    3px 3px 10px 0px rgba(0, 0, 0, 0.25);
  -webkit-box-shadow: 3px 3px 10px 0px rgba(0, 0, 0, 0.25);
  box-shadow:         3px 3px 10px 0px rgba(0, 0, 0, 0.25);
}
​
.tooltip p {
  margin: 0;
  padding: 0;
}
​
</style>
</head>
​
<body>
<div id="content">
    <h1>Walmart Store Openings, 1962-2013</h1>
    <h2 class="year"></h2>
    <h2 class="count"></h2>
    <input id="menu" type="range" min="1962" max="2013" step="1" value ="1962"/>
    <div id="map"></div>
    <script type="text/javascript" src="map.js"></script>
</div>
</body>
</html>
    