Than cross-domain request is different from loading js from cdn or iframe?

Can't understand where this boundary. Why load images from another domain is not considered cross-domain. What are the ways to get a html page from another page, without a server purely in the browser, something like a small online aggregator.
July 12th 19 at 16:39
1 answer
July 12th 19 at 16:41
javascript.ru/ajax/cross-domain-scripting it's all quite simple painted.

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