It seems there were/are a couple of workarounds for setting third party cookies in Safari. One was to send a POST request in a hidden iframe using javascript.

It seems there were/are a couple of workarounds for setting third party cookies in Safari. One was to send a POST request in a hidden iframe using javascript. This was supposedly what Google used to bypass Safari's blocking of third party cookies[1]. Another is (was?) to redirect to the third party domain, and then back again[2]. This would supposedly work since the restriction on third party cookies doesn't apply to already visited domains. 1: https://stackoverflow.com/questions/9930671/safari-3rd-party-cookie-iframe-trick-no-longer-working https://stackoverflow.com/questions/9930671/safari-3rd-party... 2: http://www.mendoweb.be/blog/internet-explorer-safari-third-party-cookie-problem/ http://www.mendoweb.be/blog/internet-explorer-safari-third-p...