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This is enforced through the following constraints: The API is designed to limit the potential storage exceptions to origins for which the user has shown an intent to interact. The embedding website needs to add this to allow storage access requests to be successful, along with allow-scripts and allow-same-origin to allow it to call the API, and execute in an origin that can have cookies: The API therefore also adds the allow-storage-access-by-user-activation sandbox token. In addition, sandboxed s cannot be granted storage access by default for security reasons. The Storage Access API is intended to solve this problem embedded cross-origin content can request unrestricted access to its first-party storage on a site-by-site basis via the Document.requestStorageAccess() method, and check whether it already has access via the Document.hasStorageAccess() method. As a consequence, users who wish to continue to interact with embedded content are forced to greatly relax their blocking policy for resources loaded from all embedded origins and possibly across all websites. In the case of breakage, site owners have often encouraged users to add their site as an exception or to disable the policy entirely. As an example, federated logins often require access to authentication cookies stored in first-party storage, and will require the user to sign in on each site separately (or completely break) if those cookies are not available. These cookie blocking policies are known to break embedded cross-origin content that requires access to its first-party storage.

The semantics around third-party cookie blocking policies in particular differ from browser to browser, but the core functionality is similar: cross-origin resources embedded in a third-party context are not given access to the same cookies and site storage that they would have access to when loaded in a first-party context. These restrictions range from giving embedded resources under each top-level origin a unique storage space to outright blocking of storage access when resources are loaded in a third-party context. Most browsers implement a number of storage access policies that restrict access to cookies and site data for embedded, cross-origin resources.