How is it possible for an iframe to access its parents DOM?

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If the content of the iframe and its parent have the same domain, you can access the parent pages DOM from the iframe by using parent.document.getElement....

However you can’t do this cross-domain (not even across different subdomains) as it will result in:

Uncaught DOMException: Blocked a frame with origin "https://example.com" from accessing a cross-origin frame.

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