This guide will introduce you how to implement Unity’s WebGL with WebSocket.
Part1
Prepare Javascript plugin function
First we will prepare the WebSocket library in javascript.
Here is my Javascript plugin for WebSocket, "WebSocket.jslib".
As you can see, we already have 5 functions (Hello,InitWebSocket,Send,State,Close) to use in Unity.
In the next part, I will show you how to create GameObject and Script.
Reference: webgl-interactingwithbrowserscripting WebSocket-echo WebSocket