[Webkit-unassigned] [Bug 189045] New: Recent change in ITP2 behaviour blocks 3rd party cookies

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=189045

            Bug ID: 189045
           Summary: Recent change in ITP2 behaviour blocks 3rd party
                    cookies
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bugreporter0001 at gmail.com

Since Release 62 of the Safari technology preview we have seen a change in ITP behaviour which causes 3rd party cookies to be purged rather than partitioned.

Visit Domain 1 with 3rd party cookies - 3rd party cookies there
Visit Domain 2 with 3rd party cookies - 3rd party cookies there
Visit Domain 3 with 3rd party cookies - 3rd party cookies purged from all 3 domains. 
Even after visiting the 3rd party domain in the 1st party context cookies continue to be purged (not expected behaviour from https://webkit.org/blog/8311/intelligent-tracking-prevention-2-0/)

On release 61 we can get cookies into a partitioned state as per the blog.

We cannot get 3rd party cookies into a partitioned state, only into a purged state (on Release 63)

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