[Params] DOM value of attribute that references a parameter

What is the DOM value of an attribute that references a parameter?

In the following snipet:

  <param name="color" value="blue" />
  <circle id="c" fill="param(color) red" />

what is the value of document.getElementById("c").getAttributeNS(null, "fill") ?

Is it the resolved value ("blue") or the raw string ("param(color)
red").  Either way it seems some information is lost...

Regards,
Jeff Schiller