>
> 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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