Consider the below scenario:
There's a checkout webpage that can be accessed at checkout.example.com. This page has decent security policy. But just to prevent any credit card info leakage, credit card information editing panel is in an iframe and this panel can be loaded from cc.example.com.
Now, are there any security benefits for having a good Content Security Policy for cc.example.com when we are loading it in an iframe in checkout.example.com?