Web Storage (localStorage, sessionStorage, cookies)

Updates are automatically synchronized
Last write always wins without notification
Updates are blocked to prevent conflicts
Changes trigger storage events in other tabs
When dealing with concurrent updates, changes trigger storage events in other tabs: 1) The 'storage' event notifies other tabs of changes, 2) Each tab maintains its own view of the storage, 3) No automatic conflict resolution is provided, 4) Applications must implement their own synchronization logic, 5) The last write to storage persists, but other tabs are notified, 6) This enables building cooperative multi-tab applications, 7) The event system allows for custom conflict resolution strategies, 8) Understanding this behavior is crucial for multi-tab application architecture.