Javascript alerts not working for browser MSIE on Xbox One

Question

This one may be simple. Javascript alerts are not working on MSIE for Xbox One. I've tested them on a PC, OSX, Nokia phone, iPhone.

Javascript obviously works as I'm using socket.io.

Here is the code:

function changeGamerTag() {
    if (socket.socket.connected) {
        socket.emit('partyup add user', prompt("Enter GAMERTAG: ") + '['+ masterrace + ']');
    } else {
      alert('Party server offline.');
    }
}

Answer 1

I've found the answer:

IE 10 for XBox does not support Javascript prompt.

The JavaScript prompt() method isn’t supported.