Web platform features explorer - __proto__

Web platform features explorer

Tags: javascript

This feature is discouraged. For the rationale, see:

https://tc39.es/ecma262/multipage/additional-ecmascript-features-for-web-browsers.html#sec-additional-ecmascript-features-for-web-browsers

The __proto__ property of objects partially exposes the prototype of an object.

Learning resources on MDN

Object.prototype.__proto__

Browser support

Chrome 1 Released on 2008-12-11
Chrome Android 18 Released on 2012-06-27
Edge 12 Released on 2015-07-29
Firefox 1 Released on 2004-11-09
Firefox for Android 4 Released on 2011-03-29
Safari 3 Released on 2007-10-26
Safari on iOS 1 Released on 2007-06-29

Specifications

ECMAScript® 2025 Language Specification (#sec-object.prototype.__proto__), from TC39 (Ecma International).

View web-platform-tests results for this feature - View the feature source file (dist) - Edit the feature - Report an issue about this feature