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I think 7.1 uses the gecko engine, and that small difference could be due to yuor specified height/width attributes and the different way browsers show it.
The gecko engine renders CSS exactly as the W3C recommends, which is not always the best way.
IE uses a non-standard box-model, which is actually easier to work with most of the time.
I think they are talking about recommending a property that can be used to specify which box model you want used and when.
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