Refuse cookies functionality

There are some changes.
If you click “no” and check the status of “cookie-notice accepted” you see it is set on “false”. You can still see the (in my case) GA cookies in the site-cookie list but they are not executed. If you press “yes” the “cookie-notice-accepted” is set on “true” and the cookie are active.

You can further check this:
If you manually remove the GA cookies from the list and refresh the page they dont come back. In the second case they do.

How do you prevent third-party cookie execution when cookie-notice-accepted is set to false?

The key points about this plugin and about the use of 3rd party cookies in general are that 1) it can only manage the cookies that you, the site administrator, have explicitly set up via a script; and 2) the plugin does not delete any cookies that might already exist. It only allows or prevents the execution of the script that reads the cookie and sends the data to the third party.
The plugin does this by providing a place to record the script(s) that create cookies and read their values and send those data to the the third parties. If you create or read cookies anywhere else in the site (for example, via another plugin or a script that you run somewhere else), the plugin has no control at all over them.
If I am not mistaken, it is completely up to the site visitor to physically delete any cookies that might already exist, using the browser’s cookie management capabilities.
Logically, the plugin should be completed by yet another function in which you can record a script to delete a given cookie, should the visitor click on the appropriate button. Indeed, it would be even better if the plugin simply allowed you to list the cookies to delete should the visitor not give permission to use them. Unfortunately, that is not (yet) the case.

@josiah-s-carberry, @fermanus said “You can still see the (in my case) GA cookies in the site-cookie list but they are not executed”. This implies that no third-party cookie data is transmitted when cookie-notice-accepted is set to false. If that is correct, no third-party cookies would need deletion.

I don’t know if this is a theoretical issue or not. But once a cookie is saved on a visitor’s site, any other site could check for its presence and read it. Of course, the interest in doing so depends entirely on the contents and/or the name of the cookie. But some might prefer deleting the cookie completely.

Thanks all for the responses – much appreciated!