Limited Availability

Shared storage locks

The withLock option to set(), append(), delete(), clear(), and batchUpdate() methods of the sharedStorage API prevents duplicate reporting from cross-site race conditions.

Baseline Status: This feature is currently Limited (not yet Baseline). Latest engine implementation shipped on Mar 6, 2025.

Desktop Browser Engine Support

Google Chrome

134

Supported

Mozilla Firefox

—

Unsupported

Apple Safari

—

Unsupported

Microsoft Edge

134

Supported

Mobile Browser Engine Support

Chrome Android

134

Firefox Android

—

Safari iOS

—

Specifications and References

Specification ↗ Feature XML ↗

MDN Browser Compat Data Keys:

api.SharedStorage.batchUpdate ↗ api.SharedStorageAppendMethod ↗ api.SharedStorageAppendMethod.SharedStorageAppendMethod ↗ api.SharedStorageClearMethod ↗ api.SharedStorageClearMethod.SharedStorageClearMethod ↗ api.SharedStorageDeleteMethod ↗ api.SharedStorageDeleteMethod.SharedStorageDeleteMethod ↗ api.SharedStorageModifierMethod ↗ api.SharedStorageSetMethod ↗ api.SharedStorageSetMethod.SharedStorageSetMethod ↗