Fixed-width SIMD (WebAssembly)Baseline · Widely available
128-bit SIMD (Single Instruction Multiple Data) performs one instruction on multiple units of data, when running on hardware that supports such instructions. Also known as vector instructions.
Supported in all major browsers for at least 30 months — safe to use without fallbacks. Baseline since Mar 27, 2023. Widely available since Sep 27, 2025.
Browser support
DesktopChrome
1–90Not supported
91+Supportedsince May 25, 2021
Current: 155Edge
12–90Not supported
91+Supportedsince May 27, 2021
Current: 154Firefox
1–88Not supported
89+Supportedsince Jun 1, 2021
Current: 157Safari
1–16.3Not supported
16.4+Supportedsince Mar 27, 2023
Current: 27MobileChrome Android
18–90Not supported
91+Supportedsince May 25, 2021
Current: 155Firefox Android
4–88Not supported
89+Supportedsince Jun 1, 2021
Current: 157Safari iOS
1–16.3Not supported
16.4+Supportedsince Mar 27, 2023
Current: 27How to use
This feature is Baseline widely available — use it freely, no fallback needed.
Example
Full syntax and examples are on MDN — see the links below.
Feature detection
There’s no simple runtime check for this feature; rely on the support table and test in your target browsers.