Tested. Mozilla on my mac is fine.
Safari came up with a white blank area.
this doesn't mean it doesn't support iframes, or the warning of "your browser doesn't support iframes", between the <iframe></iframe> tags would have been displayed.
After more testing, I found that the problem has nothing to do with the iframe itself, but with the pages you're including.
They just don't load on a mac.
I believe it is due to the frameset. That probably just screws things up. Framesets are a page, then they call pages... you just have done a frameset ON the page, and specified no frames... just content.
Safari appears, in this case, to be following what makes sense... don't display the improperly coded page, while the other browsers are being nice and ignoring it.
w3school's web validator shows this (and a couple other things)....
http://validator.w3.org/check?uri=ht...2Fmedianew.htm
Also, in Mozilla (didn't notice it in safari) the CAST menu button/image is offset vertically by a pixel or two. The rest seem ok.
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