SuzyUK - 10:25 pm on Jun 24, 2011 (gmt 0)
There is nothing wrong with using negative values.. of margin especially! - in fact it can help with those JS/JQuery scripts, it is a perfectly valid CSS value.
forget all the rubbish about negative indenting or negative offsets, which are also both valid - the myths have become intertwined.
It is perfectly OK to use negative (minus) values you would just need to understand when to use one over the other.
Negative padding is not allowed, that makes sense, when on earth would you need to use negative padding?
Negative margins are great - want a slideshow or CSS3 transition? that's your property
Negative offset, also useful but watch out - remember that offsets leave space for the original element
Negative indenting, also perfectly fine or it wouldn't exist!