According to this document they are : http://caniuse.com/websockets
But this document http://msdn.microsoft.com/en-us/library/ie/hh673567(v=vs.85).aspx seems to suggest that the earliest version is ie10
Are Spring4 websockets (or web sockets in general) supported in ie8 ?
Update : Actually, I read that document http://caniuse.com/websockets) incorrectly, they are not supported.