Privacy concerns are at an all-time high, and browsers have begun enforcing limitations on third-party cookie functionality to phase them out. In 2019, Safari started forcing a 7-day expiration for third-party cookies, and Firefox started blocking them by default. In Q1 of 2024, Google Chrome will start blocking third-party cookies for 1% of its users by default, increasing to all users in the second half of 2024.
How does this affect you?
Without third-party cookies to identify them, users are considered new users. In Safari this happens 7 days after the most recent visit, and if cookies are completely blocked, the user is considered a new user upon every pageview. The implications can be significant: An inflated number of users, broken variation stickiness in A/B testing, detached historical data, and more.
To overcome this limitation, you must serve our DYID cookie from your server, making it a first-party cookie that isn't affected by these restrictions.
See our Developer Docs to learn how to serve the DYID cookie from your server.
Dynamic Yield by Mastercard Chrome extension
As of the beginning of 2024, Google has started the rollout of a stricter third-party cookies policy. If third-party cookies are blocked, several capabilities relating to editing and debugging content on your site won't work. Learn more about how to overcome this restriction.