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.
var extensions = aWebSocket.extensions;
A DOMString.
| Specification | Status | Comment |
|---|---|---|
| HTML Living Standard The definition of 'WebSocket: extensions' in that specification. | Living Standard | Initial definition |
| Desktop | ||||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
| Basic support | Yes | ? | 8 | ? | Yes | ? |
| Mobile | |||||||
|---|---|---|---|---|---|---|---|
| Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | ? | Yes | ? | 8 | ? | ? | ? |
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https://developer.mozilla.org/en-US/docs/Web/API/WebSocket/extensions