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by d-z-m 930 days ago
> but it is not immediately clear to me if posting a form cross domain will send cookies.

As sibling comment says, this is what SameSite is for.

If it's a POST form, SameSite=Lax or SameSite=Strict won't send the cookie.

If it's a GET form, SameSite=Strict won't send the cookie. SameSite=Lax might, I'm not entirely sure.