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Note: When I say “top-level” I am talking about the URL that you see in the address bar. So if you load fun-games.example in your URL bar and it makes a request to your-bank.example then fun-games.example is the top-level site.
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Meaning explicit creds won’t be sent. Even if fun-games knows how to send explicit creds, it can’t because fun-games does not have access to creds which stored for your-bank. Say suppose your-bank creds stored in local store. Since current URL is fun-games it can only access local storage of fun-games, not your-bank.