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I have locked down Chrome to be very strict on the cookies and data it stores both temporarily and long term. I have ticked the following boxes in cookie settings:

Cookie Settings

and I currently have an exception list which looks like this [that's the complete list]:

Cookie Exception List

However, if I look at the currently saved cookies:

Current cookies

Notice there is youtube.com, microsoft.com, msn.com. I know that subdomains are permitted, but I would have expected cross domains to be blocked but yet somehow these are still being set. If I go to www.youtube.com and click the cookie icon in the omnnibox I can see that I definitely haven't allowed youtube.com cookies:

Youtube cookies blocked

Am I missing something?

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Sorry I can't help but what a wonderfully clear question! +1 –  Dave May 8 '13 at 14:33
    
You have allowed Google which shares Cookies among all its sites (because it has a single login service). I assume you cleared out your cookies before you blocked all third-party cookies? A YouTube cookie created by Google isn't considerd a third-party –  Ramhound May 8 '13 at 15:18
    
Yep I did a complete clear out of current site data (initially didn't want to because of the site data I wanted to keep but decided to take the plunge) so it's a fresh start. The way I understand it, I have allowed Google.com and it's subdomains, NOT Google the company. Regardless of the single sign on, I have not allowed Youtube.com to save a cookie, and yet it has. Same applies to Microsoft.com and Msn.com (in case Chrome, being made by Google, gave special privelages). –  Chris May 8 '13 at 15:36

1 Answer 1

Did you cleared your cookies after blocking them? I think blocking cookies will not delete existing items. It'll only prevent setting new cookies.

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Yep I deleted all my existing cookies, I think you're correct it won't delete existing cookies so I made sure to rule that out of the equation. –  Chris May 8 '13 at 15:38

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