Is there a solution that work in the thread?

There is currently no working solution in the thread for safari. The user needs to open the iframe url directly, then its possible to set a cookie. I'm not sure, how you can implement this. Maybe as extra button?

See also #2930

Same problem applies when using Puffin trying to opt out (browser from the apple store using a user agent).

Am I doing something wrong here? I created a .htaccess simply including header append P3P "CP="CAO PSA OUR"" and nothing else, that doesn't work. Putting header('P3P: CP="CAO PSA OUR"'); into index.php (just below the use commands) doesn't do the job for me either... did I misunderstand something there?
This solution partly works for puffin though (the .htaccess one), as I can now unhook in the iframe. Yet it still shows any activity in piwik when using this browser...

I believe the problem "may" be that these browsers don't accept third party cookies, and that opt-out iframe works by setting an "opt-out" cookie which is third party.

(as opposed to our other tracking cookies which are first party).

Not sure what the best solution would be, to have opt-out work on all browsers?
How could we make the iframe work for all browsers?

Another solution would be to add the opt-out feature to the Piwik tracker itself. eg. Piwik.showOptOutMessage()

A website operator could be put this code in the Privacy Policy page, or other places. This would show a message with a checkbox, letting visitors know whether they are tracked or not. A visitor is not tracked if he has the first party cookie "donottrack" or if DoNotTrack feature is enabled in browser. Visitor can click on checkbox to set a first party cookie "donottrack" which will exclude them from tracking.

The disadvantage of first party cookies is that tracking will be enabled only on this website and not all websites within Piwik.

A new idea was suggested: make opt-out iframe redirect to piwik server, set the cookie, then silently redirect back to the page where the opt-out iframe was included. Maybe in this case the opt-out cookie would be properly set?

This could work. Not sure how a silent redirect will be implemented. Maybe as blank page with a redirect in the meta data? The form in the Opt-out frame could use "_top", so the whole tab is loading the piwik server page.

@ryrun good idea to use _"top" so the iframe simply redirects the whole page back, this would make a smooth user experience.

Hey Guys,

the most important features of Piwik are: Privacy protection and complaint with the privacy regulation of the European Union. The opt-out is a very important feature there, because the opt-out is requested i.e. by the German law!

I would like to ask you to increase the importance of this Issue and start solving this.

Can this be possible?

Br, Alex

After some testing, everything appears to work on IE7/8/9. I can confirm it's broken for Safari.

Is there any timeline when this Issue will be solved? It is very important!
@mattab could you schedule this fix?

It is scheduled for 2.14.0 (as you can see in the Milestone section on the right). I've assigned myself to fix it.

This issue does still exist for me with Piwik 2.14.3 and Internet Explorer 11 if third party cookies are disabled.
The optout checkbox will stay checked even if I click on it.

@Cruiser13 thanks for the report. Created an issue: #8578