Exponentiation operatorBaseline · Widely available
The exponentiation (**) operator returns the result of raising the first operand to the power of the second operand.
Supported in all major browsers for at least 30 months — safe to use without fallbacks. Baseline since Mar 27, 2017. Widely available since Sep 27, 2019.
Browser support
DesktopChrome
1–51Not supported
52+Supportedsince Jul 20, 2016
Current: 155Edge
12–13Not supported
14+Supportedsince Aug 2, 2016
Current: 154Firefox
1–51Not supported
52+Supportedsince Mar 7, 2017
Current: 157Safari
1–10Not supported
10.1+Supportedsince Mar 27, 2017
Current: 27MobileChrome Android
18–51Not supported
52+Supportedsince Jul 27, 2016
Current: 155Firefox Android
4–51Not supported
52+Supportedsince Mar 7, 2017
Current: 157Safari iOS
1–10Not supported
10.3+Supportedsince Mar 27, 2017
Current: 27How to use
This feature is Baseline widely available — use it freely, no fallback needed.
Example
Full syntax and examples are on MDN: Exponentiation.
Feature detection
JS · check before using
// Syntax can't be tested with an if-statement — an unsupported
// browser fails to parse the whole script. Either transpile for older
// targets (e.g. Babel/TypeScript/esbuild), or probe in isolation:
let supported = true;
try {
new Function("/* code that uses the syntax */");
} catch {
supported = false;
}This is a language syntax feature.
Documentation (MDN)
Specification
Sub-features
Support for each part of the feature (2). The overall table above shows when the whole feature works.
| Sub-feature | Chrome | Edge | Firefox | Safari | Chrome Android | Firefox Android | Safari iOS |
|---|---|---|---|---|---|---|---|
| exponentiation | 52 | 14 | 52 | 10.1 | 52 | 52 | 10.3 |
| exponentiation_assignment | 52 | 14 | 52 | 10.1 | 52 | 52 | 10.3 |