Edit in JSFiddle

write("Step 1. Creating the WebSocket");
var socket = new WebSocket("wss://cloud.mofowallet.org:7986/ws/");
write("Step 2. Registering WebSocket listeners");
socket.onopen = function (e) {
    write("socket opened");
    write("Step 3. Closing the socket");
    socket.close();
};
socket.onclose = function (e) {
    write("socket closed");
};

<script type="text/javascript">
function write (text) {
    var p = document.createElement('p');
    p.textContent = text;
    document.getElementById("output").appendChild(p);
}
</script>
<div id="output"></div>