0 and 0px are the same thing - that is strictly a preference and makes no difference.
http://www.w3.org/TR/CSS2/syndata.html#length-units
Quote:
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The format of a length value (denoted by <length> in this specification) is a <number> (with or without a decimal point) immediately followed by a unit identifier (e.g., px, em, etc.). After a zero length, the unit identifier is optional.
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History will be kind to me for I intend to write it.
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