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If the page loads any element from youtube.com, your browser will retrieve any youtube.com cookie it has stored and send it with the request to youtube.
The same-origin policy enforced by browsers means that the only thing I cookie I can manipulate are cookies from my own domain. Other cookies I can only block by preventing the resources from loading. The resources I load from youtube on playback don't set cookies, so if one appeared - it was already in your browser and there's no way for me to detect that (same-origin policy)
I believe that if you delete that cookie, you'll find that you're logged out of youtube, which means it's the youtube login/session cookie (set when you log into youtube/google)
I thought that we are responsible for all third party stuff on our website. So if a user says DECLINE ALL COOKIES, somehow we have to not affect the user's pc with cookies at all. Even if this means to make our website completely dysfunctional.
When you load the page, go to your "network" tab, and down the list of loaded elements until you see a "Set-Cookie" header. for an element coming from youtube-nocookies.com
I tried but could not follow your instructions. Here s what I got:
Here is what I did:
1) Go to Chrome Incognito mode.
2) Go to chrome settings (cookies) page.
3) Clean all cookies.
4) Add a page tab (google.com)
5) Clean cookies again (obviously created from google.com).
6) In the new tab, paste the url :
and Decline Cookies.
7) Chrome-Inspect shows no cookies on this page.
8 ) Go to chrome settings, there are 6 cookie entries. I assume they came from your page, but I am not sure.
9) Start the video on your page.
10) Chrome-Inspect still shows no cookies on this page. Contrary to what I had noticed before (
11) Go to chrome settings, there are at least 11 cookie entries. I assume the new ones came from the video that just started, but again I cannot be sure.
Using the network tab, you can track every element loaded from every resource to see where cookies come from. I've done this many times for my no-cookies extensions. These cookies can come from browser extensions, or even other browser windows you have open.
The incognito window doesn't have separate settings - when you open the cookie view, it's all of chrome, not just the incognito window. If you have another window open, it can affect the contents of that list.
you might also try looking at the content of those cookies, not just the list of domains. Like the applications tab, it may be listing domains that have no cookies (Normal operation in the applications tab)