How do you get the width of an element without a defined width?

Posted by Moak on Stack Overflow See other posts from Stack Overflow or by Moak
Published on 2010-04-26T14:38:15Z Indexed on 2010/04/26 14:43 UTC
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html

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css

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elements

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width

How would you find out the width of a element that is wrapped by 20 odd other elements, but the only fixed width I know is the main wrapper's which is 800px. All child elements are generally blocks, floating or not, with different paddings and margins.
I don't really need the answer to a specific case, I'm just wondering if there are tools or tricks to quickly calculate such things.
Thanks

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