As I suspected, the iframe suggestion did not make a difference. I asked Support to keep working on it.
FYI, I was just looking at Magix / Xara support pages. I searched for "external code" and was presented with a page of suggested help topics and answers. This page is a prime opportunity for an accordion style question and answer format. Instead, what is there is a list of links to additional pages with the first few words of the answer below the link. So, if they can't do it, neither can I?
After seeing that, I'll likely adopt a similar format for the page I'm trying to design, rather than keep banging my head against the wall.
Thanks for the help Egg Bramhill and Acorn. I appreciate your efforts.
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