IconVault's Web Locks playground is an interactive lab for the Web Locks API, the browser's built-in way to coordinate work across tabs, workers, and iframes. Request real exclusive and shared locks by name, watch them queue and release in the live lock table, and run a two-request race to see ordering in action. It is free and runs fully in your browser with nothing uploaded.

Open the page in a second tab and request the same lock name to feel genuine cross-tab coordination. The playground covers exclusive vs shared modes, hold times, the pending queue, and navigator.locks.query(), with a timestamped event log so every acquire and release is visible. Whether you are guarding IndexedDB writes, serializing uploads, or just learning the API, this is the fastest way to build intuition for web locks.