Sets site_for_cookies
as the policy URL for same-site cookies for this.
It is either the URL of the top-level document or null depending on whether the registrable domain of this document's URL matches the registrable domain of its parent's/opener's URL. For the top-level document it is set to the document's URL.
See the same-site spec for more information.
this |
a Message |
site_for_cookies |
the Uri for the this's site for cookies |