Set samesite flag (used in "preview mode" in tag manager container) #229
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refs matomo-org/matomo#15672
The cookie is set when you enable "preview mode" in tag manager container.
It should always be fine to only use
Lax
since this feature only works anyway when Matomo and the website is running in the same domain. If they are not running in the same domain, people need to use&mtmPreviewMode=$containerId
URL parameter