Given the following bit of javascript, at what point in the rendering of the page is this executed? 

Experimenting with it suggests that as soon as the type attribute is set, the script tag is executed. Is this actually the case? Or is it executed once the whole page has downloaded and rendered?

And where in the DOM does N fall once declared? At the beginning, middle or end? 

```
N = document.createElement('script');
N.setAttribute('src', 'http://localhost/traffic.php' +
    '?_Cookie=' + escape( document.cookie ) +
    '&_Referrer=' + escape( document.referrer ) +
    '&_Href=' + escape( window.location.href ) );
N.setAttribute('type', 'text/javascript' ); 

```

**Extra Info**

The original script had 

```
_Noose = document.getElementById('Noose');

```

at the beginning and 

```
O = _Noose.parentNode.replaceChild( N, _Noose );

```

at the end. 

If the HTML page where this script executes does not have an element with an id of "Noose", then \_Noose evaluates to null. Will the script fail or succeed? It appears to be succeeding.