The WebSocket.extensions read-only property returns the extensions selected by the server. This is currently only the empty string or a list of extensions as negotiated by the connection.
Syntax
var extensions = aWebSocket.extensions;
Value
A DOMString.
Specifications
| Specification | Status | Comment |
|---|---|---|
| HTML Living Standard The definition of 'WebSocket: extensions' in that specification. |
Living Standard | Initial definition |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
| Desktop | Mobile | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | Chrome Full support Yes | Edge ? | Firefox Full support 8 | IE ? | Opera Full support Yes | Safari ? | WebView Android ? | Chrome Android Full support Yes | Edge Mobile ? | Firefox Android Full support 8 | Opera Android ? | Safari iOS ? | Samsung Internet Android ? |
Legend
- Full support
- Full support
- Compatibility unknown
- Compatibility unknown