Tyme,
> 1. "0" values do not take a measurement. margin: 0; not margin:0px;
A minor quibble: when a length value is zero, a unit-of-measurement
identifier is optional, but still allowed [1]. For consistency, I personally
use them even for zero values.
James Aylard
1. http://www.w3.org/TR/REC-CSS2/syndata.html#length-units