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Storage Partitioning

Tracking

Third‑Party Tracking First‑Party Isolation Cookie Partitioning Local Storage

Browser feature partitioning storage (cookies, localStorage, caches) by top-level site to reduce correlation.

Definition

Storage partitioning extends isolation beyond cookies to other storage mechanisms (localStorage, IndexedDB, caches). It reduces cross-site identifiers and linkability.

In plain English Browser feature partitioning storage (cookies, localStorage, caches) by top-level site to reduce correlation.

Why this matters

Why it matters: Trackers often move to other storage when cookies are blocked; partitioning addresses that.

Example

Example: Partition cache and storage by top-level site to prevent third-party reuse of stable identifiers across domains.