javascript.builtins.Atomics.waitAsync - was incomplete in Chrome until Chrome 91

[RReverser]

What type of issue is this?

Browser bug (a bug with a feature that may impact site compatibility)

What information was incorrect, unhelpful, or incomplete?

Atomics.waitAsync was available since Chrome 87 as the data says, but it was incomplete / broken when using timeout params. The first correct implementation was in Chrome 91.

What browsers does this problem apply to, if applicable?

Chromium (Chrome, Edge 79+, Opera, Samsung Internet)

What did you expect to see?

It should note that implementation is broken under Chrome 91 or just say that Chrome 91 is the first version where feature appeared.

Did you test this? If so, how?

Not myself, but found via Emscripten sources which uses Chrome 91 as the minimum version below which it will use a custom polyfill instead.

Can you link to any release notes, bugs, pull requests, or MDN pages related to this?

• https://bugs.chromium.org/p/chromium/issues/detail?id=1167541
• https://github.com/emscripten-core/emscripten/blob/afa27abc054044455dc2a8dc6aa9d15b65788f04/src/library_atomic.js#L9-L17

Do you have anything more you want to share?

No response

MDN URL

No response

MDN metadata

No response