I honestly wasn't aware that was the law. I thought it was all cookies, that's what the warning messages are worded to sound like they are saying, thank you for

I honestly wasn't aware that was the law. I thought it was all cookies, that's what the warning messages are worded to sound like they are saying, thank you for correcting me. My question then is, websites are phoning home through use of iframes? Because those cookies aren't accessible on different domains than the ones they were issued. Am I to understand companies are loading their own domain in hidden iframes that phone home when I visit a website? Like it checks the iframe's top window location and tracks what pages I'm on? Now you have me feeling paranoid. What can be done about that. Google analytics arguably is a very useful service.