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Basically whatever page you're loading into the iframe will control the background color.
P.S. - iframes suck in soooooo many ways ;)
iframeelement won't have any effect unless the
bodyelement of the framed page has its
backgroundproperty set to
Just setting the background-color doesn't seem to work, but creating a small gif of the appropriate color and setting the background-image: (whatevercolourwant.gif) will do the trick.