[xul-interop] Using colorpicker in xul

I have problem to  see how's colorpicker work in Mozilla by trying the following
.xul get from net. Anyone has any idea?

<?xml version="1.0"?>
<!DOCTYPE window>
<window 
    xmlns:html="http://www.w3.org/1999/xhtml"
    xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">

<html:script>
  function doSomethingUseful(cp)
  {
    var color = cp.getAttribute('color');

    document.getElementById("input").value = color;
    document.getElementById("mydiv").style.backgroundColor = color;
  }
</html:script>

<colorpicker id="cp" onclick="doSomethingUseful(this);"/>
<html:p/>
<html:input id="input"/>
<html:p/>
<html:div id="mydiv" style="width:100px; height:100px; background-color:white"/>
 

<html:hr/>
</window>



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