>
> What kind of magic does Firebug use to get real values when the standard 
> ones don't work?
>
In this case none. You should be able to get the width via 
document.getElementById("ent-13").clientWidth. It's a property, so don't 
add brackets.
Note that the 
clientWidth<https://developer.mozilla.org/en-US/docs/Web/API/element.clientWidth>only
 includes the padding but not the border or the margin.

If it still doesn't work for you, please provide a URL to your side, so I 
can test it myself.

Sebastian

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