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.
WebSocket.extensions
Value
A DOMString.
Specifications
| Specification |
|---|
| WebSockets Standard # ref-for-dom-websocket-extensions① |
Browser compatibility
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
extensions |
16
|
12
|
8
|
10
|
12.1
|
6
|
4.4
|
18
|
8
|
12.1
|
6
|
1.0
|
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https://developer.mozilla.org/en-US/docs/Web/API/WebSocket/extensions
