# System.Net.WebSockets

``` diff
 namespace System.Net.WebSockets {
     public sealed class ClientWebSocketOptions {
+        [UnsupportedOSPlatformAttribute("browser")]
+        public TimeSpan KeepAliveTimeout { get; set; }
     }
     public sealed class WebSocketCreationOptions {
+        public TimeSpan KeepAliveTimeout { get; set; }
     }
 }
```

