The locks read-only property of the WorkerNavigator interface returns a LockManager object which provides methods for requesting a new Lock object and querying for an existing Lock object. 
 The locks read-only property of the WorkerNavigator interface returns a LockManager object which provides methods for requesting a new Lock object and querying for an existing Lock object. 
A LockManager object.
| Specification | 
|---|
| Web Locks API  # dom-navigatorlocks-locks  | 
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
locks | 
69 | 79 | 96 | No | 56 | 15.4 | 69 | 69 | 96 | 48 | 15.4 | 10.0 | 
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    https://developer.mozilla.org/en-US/docs/Web/API/WorkerNavigator/locks