Web platform features explorer - Relaxed-width SIMD (WebAssembly)

Relaxed SIMD (Single Instruction Multiple Data) introduces local non-determinism, where the results of the instructions may vary based on hardware support.

Status

Limited availability

MDN documentation

No MDN documentation found. You can search for the feature on MDN. If you believe that MDN has no documentation about this feature, you can open an issue on MDN's GitHub repository.

Specifications

https://github.com/WebAssembly/relaxed-simd/blob/main/proposals/relaxed-simd/Overview.md

Browser support

Chrome 114 Released on 2023-05-30
Chrome Android 114 Released on 2023-05-30
Edge 114 Released on 2023-06-02
Firefox 146 Released on 2025-12-09
Firefox for Android 146 Released on 2025-12-09
Safari ❌ Vendor position : neutral
Safari on iOS ❌ Vendor position : neutral

Baseline availability blocked since December 2025 by Safari (2 months)

Usage (according to Chrome Platform Status)

~0.011% of page loads. More data at chromestatus.com.

Web Platform Tests (WPT)

View the latest WPT test results for this feature

Developer votes

👍
2

Do you need this feature?
Let us know by leaving a 👍 reaction on the feedback issue. Don't forget to also leave a comment explaining your specific use case.

View as JSON | Edit this feature | Report an issue | Web-features entry: source, dist