random-color.xml

<scene>
  <spawn position="0 0 10" />
  <box id="home" color="#ff00aa" position='-3 1.5 0' scale="3 3 3" />
  <box id="two" color="#0033aa" position='3 1.5 0' scale="3 3 3" />
  <skybox style="color: linear-gradient(#fff, #acf)" />

  <billboard position="0 1 0">
    <![CDATA[
      <center style="padding: 40px; font-size: 2em">
        This is a simple demo that shows how you can change the color
        of a box.
      </center>
    ]]>
  </billboard>

  <script>
    function randomColor(){
      return (0x100000 + ~~(Math.random() * 0xEFFFFF)).toString(16);
    }

    document.addEventListener("ready", function(event) {
      setInterval(function(){
        document.getElementById("home").style.color = '#' + randomColor();
      }, 800);

      setInterval(function(){
        document.getElementById("two").style.color = '#' + randomColor();
      }, 1000);
    });
  </script>
</scene>