<html><head> <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/d3@7"></script></head><body><h3>Simple transitions</h3><script> d3.select("body").transition().duration(2000).style("background-color", "red") // make the background-color lightblue.transition() .transition().duration(1000).style("background-color", "green"); // make the background-color gray </script></body></html>