Threads in WebAssembly run code in parallel, while atomic memory instructions can guarantee that no two threads can read or write to shared memory at the same time.

Learning resources on MDN

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Browser support (view on caniuse.com)

• Chrome 74 Released on 2019-04-23
• Chrome Android 88 Released on 2021-01-19
• Edge 79 Released on 2020-01-15
• Firefox 79 Released on 2020-07-28
• Firefox for Android 79 Released on 2020-07-28
• Safari 15.2 Released on 2021-12-13
• Safari on iOS 15.2 Released on 2021-12-13

View web-platform-tests results for this feature - View the feature source file - Edit the feature - Report an issue about this feature