Web features explorer - Relaxed-width SIMD (WebAssembly)

Web features explorer

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

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 Not supported Position: neutral
Safari on iOS Not supported Position: neutral

Baseline availability blocked since December 2025 by Safari (7 months)

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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

Usage (according to Chrome Platform Status)

~0.079% of page loads. More data at chromestatus.com.

Web Platform Tests (WPT)

View the latest WPT test results for this feature

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