Force-Directed Graph With Selection

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<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>d3.js selection frame example</title>
    <link rel="stylesheet" href="app.css">
  </head>
  
  <body>
    <svg width="960" height="600"></svg>
  </body>
​
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <script src="https://d3js.org/d3-selection-multi.v0.3.min.js"></script>
  <script src="force.js"></script>
  <script src="selection.js"></script>
</html>
    

Modified http://d3js.org/d3.v4.min.js to a secure url

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

https://d3js.org/d3-selection-multi.v0.3.min.js