Third-party cookies. Example 2. allow cross domain cookies chrome The smartest solution is to follow facebook's path on this. How does facebook know who you are when you visit any domain? It's actually very simpl... Developers can start testing their sites to see how the cookie-handling changes will affect their sites in the latest developer version of Chrome. 3. allow cross domain cookies chrome. Allow CORS: Access-Control-Allow-Origin - Chrome Web Store But once a cookie is set by site A, you can send that cookie even in requests from site B to site A (i.e. Cookieless Tracking For Cross-site Iframes | Simo Ahava's blog Specifying a cookie as “SameSite=Strict” allows no cross-site sharing. unblock cross domain cookies chrome