D3 Examples - simple transition animation

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<!DOCTYPE html>
<html>
   <head>
      <script type = "text/javascript" src = "https://d3js.org/d3.v4.min.js"></script>
   </head>
​
   <body>
      <h3>Simple transitions</h3>
      <p>Reference: <a href="https://www.tutorialspoint.com/d3js/d3js_animation.htm">
        https://www.tutorialspoint.com/d3js/d3js_animation.htm</a></p>
      <script>
        var body = d3.select("body");
        body.style("background-color", "lightblue");
        // make the background-color lightblue.transition()
        body.transition()
           .style("background-color", "gray")
           .duration(5000);
        // make the background-color gray
      </script>
   </body>
</html>
    