ClassesBaseline · Widely available

Classes are an object-oriented syntax for JavaScript prototypes.

Supported in all major browsers for at least 30 months — safe to use without fallbacks. Baseline since Mar 8, 2016. Widely available since Sep 8, 2018.

How to use ↓Compare browsers

Browser support

DesktopChrome

1–41Not supported

42+Supportedsince Apr 14, 2015

Current: 155

Edge

12–12Not supported

13+Supportedsince Nov 12, 2015

Current: 154

Firefox

1–44Not supported

45+Supportedsince Mar 8, 2016

Current: 157

Safari

1–8Not supported

9+Supportedsince Sep 30, 2015

Current: 27

MobileChrome Android

18–41Not supported

42+Supportedsince Apr 15, 2015

Current: 155

Firefox Android

4–44Not supported

45+Supportedsince Mar 8, 2016

Current: 157

Safari iOS

1–8Not supported

9+Supportedsince Sep 16, 2015

Current: 27

How to use

This feature is Baseline widely available — use it freely, no fallback needed.

Example

Full syntax and examples are on MDN: Classes.

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

tc39.es#sec-class-definitions ↗

Usage share

caniuse.com/es6-class ↗

Sub-features

Support for each part of the feature (14). The overall table above shows when the whole feature works.

Sub-feature	Chrome	Edge	Firefox	Safari	Chrome Android	Firefox Android	Safari iOS
javascript.classes	42	13	45	9	42	45	9
javascript.classes.constructor	42	13	45	9	42	45	9
javascript.classes.extends	42	13	45	9	42	45	9
javascript.classes.private_class_fields	74	79	90	14.1	74	90	14.5
javascript.classes.private_class_fields_in	91	91	90	15	91	90	15
javascript.classes.private_class_methods	84	84	90	15	84	90	15
javascript.classes.public_class_fields	72	79	69	16	72	79	16
javascript.classes.static	42	13	45	9	42	45	9
javascript.classes.static.class_fields	72	79	75	14.1	72	79	14.5
javascript.classes.static.initialization_blocks	94	94	93	16.4	94	93	16.4
class	42	13	45	7	42	45	7
new_target	46	13	41	11	46	41	11
super	42	13	45	7	42	45	7
class	42	13	45	10.1	42	45	10.3