Limited Availability WebAssembly

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.

Baseline Status: This feature is currently Limited (not yet Baseline). Latest engine implementation shipped on Dec 9, 2025.

Desktop Browser Engine Support

Google Chrome

114

Supported

Mozilla Firefox

146

Supported

Apple Safari

—

Unsupported

Microsoft Edge

114

Supported

Mobile Browser Engine Support

Chrome Android

114

Firefox Android

146

Safari iOS

—

Specifications and References

Specification ↗ Feature XML ↗

MDN Browser Compat Data Keys:

webassembly.relaxed-SIMD ↗