text: require("./../lib/env-js/envjs/node");
  require("./../lib/sizzle/sizzle");
  require("./../d3");
  
  var body = d3.select("body")
      .style("background-color", "white");
  
  console.log("transition start:");
  console.log("  ", body.style("background-color"));
  console.log("");
  
  body.transition()
      .style("background-color", "red")
      .each("end", function() {
        console.log("transition end:");
        console.log("  ", body.style("background-color"));
        console.log("");
      });
  