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Example tests enter/update/exit
<!DOCTYPE html> <head> <meta charset="utf-8"> <link rel="stylesheet" href="testingExitEnter.css"> <link href='https://fonts.googleapis.com/css?family=Raleway:400,700' rel='stylesheet' type='text/css'> </head> <body> <h1>Mouse around the screen and see what you find... </h1> <script src="https://d3js.org/d3.v3.min.js"></script> <script src="testingExitEnter.js"></script> </body>
Modified
http://d3js.org/d3.v3.min.js
to a secure url
https://d3js.org/d3.v3.min.js