[Webkit-unassigned] [Bug 175934] New: Third-party cookies shared when requesting video content

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=175934

            Bug ID: 175934
           Summary: Third-party cookies shared when requesting video
                    content
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tppiotrowski at gmail.com

To reproduce:
1. Under privacy settings choose:
   -Allow from current website only OR Allow from websites I visit
2. Confirm third-party cookies are disabled by visiting: https://alanhogan.github.io/web-experiments/3rd/third-party-cookies.html
3. Create a page on domain1.com that embeds a <video src="http://domain2.com"> and notice that domain2.com Cookies are sent with the request. 
   This behavior differs from both Firefox and Chrome which deny the cookies being sent.

Correct behavior:
domain2.com Cookies should not be sent.

I've documented a real world scenario in this blogpost: https://tedpiotrowski.svbtle.com/broken-video-attachments-in-gmail

My apologies if this behavior is intentional to prevent user pain/confusion.

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