eu.org is a public suffix (check the list), which means that every domain below it is treated as it's own seperate security context. Meaning cookies are not sha

eu.org is a public suffix (check the list), which means that every domain below it is treated as it's own seperate security context. Meaning cookies are not shared between domain-a.eu.org and domain-b.eu.org. If they weren't on the public suffix list, cookies would be shared. This also affect a myriad of other contexts that the browser applies against the public suffix list.