This example dynamically creates an iframe and assigns a function to its
onload event handler.
This typically works in only Internet Explorer and Firefox so long as the iframe just loads a local resource. The problem is that I've changed
document.domain to be "nczonline.net", which makes the page a member of
nczonline.net while the iframe is a member of
www.nczonline.net. This difference causes a security issue and the assignment to
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