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This approach wasn??™t
as silly as it may seem at first glance: in cases in which you have an element with
a width of 100%, the IE5 box model allows you to add padding and borders safely.
Compare this to the correct CSS box model, in which you cannot add any padding
or borders to an element with a width of 100% without breaking the layout.
Although the IE5 box model appears superior in this example, the correct box model
is more useful in nearly all other cases. No other browser implemented the IE5 box
model, and Microsoft eventually complied with the CSS standards and corrected
its box model implementation in Internet Explorer 6 (when in standards mode).
Before that, though, there was a long period in which CSS authors were forced to
deal with two competing box model implementations??”a situation that explains
why so many CSS hacks (p. 391) were created.
As the IE5 box model had some merit, it has been proposed that CSS3 will provide
authors with the choice of specifying which model to use via a box-sizing
property.


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