REFERRER_POLICY_REDUCE_REFERRER_GRANULARITY_ON_TRANSITION_CROSS_ORIGIN

A slight variant on CLEAR_REFERRER_ON_TRANSITION_FROM_SECURE_TO_INSECURE: If the request destination is HTTP, an HTTPS referrer will be cleared. If the request's destination is cross-origin with the referrer (but does not downgrade), the referrer's granularity will be stripped down to an origin rather than a full URL. Same-origin requests will send the full referrer.