Does Chrome’s SameSite cookie policy affect Piwik PRO tracking?

On February 4, 2020, Google introduced a Chrome browser update called the SameSite update. This update requires website owners to label their third-party cookies, otherwise, these cookies won’t work properly in Chrome.

Does the SameSite update influence your tracking? No, it doesn’t. Here’s why:

  • Piwik PRO only uses first-party cookies, which are fully accepted by the Chrome browser.
  • Starting with version 17.4.0, we add the SameSite=Lax parameter to tracking cookies. This tells browsers to set these cookies only if the website domain matches the cookie domain for same-site requests or top-level navigation. We also include the SameSite=Strict parameter for container cookies, which prevents them from being shared across different domains, even if they belong to the same company. This means that our cookies are marked as not shareable.
  • In versions below 17.4.0, we apply the SameSite=Lax parameter to both tracking and container cookies.

For more about Chrome’s SameSite cookie policy, see “Cookies default to SameSite=Lax” and “Reject insecure SameSite=None cookies.”

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