vertical collapsible tree diagram

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<!DOCTYPE html>
<meta charset="UTF-8">
<style>
​
.node rect {
  fill: #fff;
  stroke: steelblue;
  stroke-width: 3px;
}
​
.node text {
  font: 12px sans-serif;
}
​
.link {
  fill: none;
  stroke: steelblue;
  stroke-width: 5px;
}
​
</style>
​
<body>
​
<!-- load the d3.js library --> 
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="vertical_tree.js"></script>
</body>
​
    

https://d3js.org/d3.v4.min.js