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Local Storage

Web Security

Tracking XSS (Cross‑Site Scripting) Cookie Storage Partitioning

Browser storage that can keep data even after you close the tab.

Definition

Local storage is a browser feature that lets websites store data on your device and keep it for a long time.

In plain English Browser storage that can keep data even after you close the tab.

Why this matters

Why it matters: It can store identifiers for tracking, and it can be exposed if a site has an XSS bug.

Example

Example: A site stores your “theme” setting or a tracking ID in local storage.