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Cross-domain communication

If I have an aspx site on one server, let’s call it and I have a php site on another server, let’s call it, and I want to use an iframe to include data from within the site, security for iframes prevents this correct?

So, if I instead create a subdomain of, let’s call it and use for the aspx site, does that overcome the cross-domain security issue since both sites are now part of the domain or does the nature of being a tertiary domain still create the security issue since is technically different than

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