Window Message : window.message();

Plain JavaScript implementation :

Include the window-message.js file within your source code.
<script type="text/javascript" src="window-message.js"></script>
Send messages to the window simply by calling the function:
message('your message goes here');

Usage Examples :

'Hello World' Message
```
message('Hello World!');
```
Send a 'hello world' message to the output message window :

Arbitrary Message

var val = document.querySelector('#input-test-02').value;
    val = (val == '') ? 'no input message!!' : val;
    message(val);

Send an arbitrary message :

Multiple Messaging

var n = [];
    for ( var i in navigator ) { n.push(i +' : '+ navigator[i]); }
    function nn(i) {
        message(n[i]);
        if ( i < n.length-1 ) { setTimeout(function(){ nn(i+1) }, 200); }
    }
    nn(0);