When specifying a 0 value in CSS, should I explicitly mark the units or omit?

Question

This is more of a \'philosophy\' argument, but I\'d like to know what the recommended practice here. I\'m not setting it up as a Wiki yet in case there is an \'official\' an

Answer 1

The CSS specification says (quote):

After a zero length, the unit identifier is optional.

And I've read many times that it is suggested to omit the unit, I can't remember where.

So omit them.