[basic transitions] changing colors

Changing SVG text property.

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>

<body>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)

var g = svg.append("g");
    
    g.append("text")
      .text("Watch me!")
      .attr("y", 100)
      .attr("x", 290)
      .style("font-size", 46)
      .style("font-family", "monospace")
    
    g.append("text")
    	.text("I'm a chameleon!")
      .attr("y", 200)
      .attr("x", 240)
      .style("font-size", 36)
      .style("font-family", "monospace")

var my_colors = ["blue", "green", "purple", "orange", "red", "black"]
    
    d3.range(my_colors.length).map(function (d){
      d3.select("g").transition()
        .delay(1200*d)
        .style("fill", my_colors[d])
    });
    
  </script>
</body>

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