I think I would trust the actual CSS specs over a page at About.com. Sure; About.com does say
non negative integer, but so often, people use that term to mean the same as
positive integer, but from a strict defintion. the two are NOT the same.
From OEIS
Negative Integers
http://oeis.org/wiki/Negative_integers
Quote:
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The negative integers are real integers that are less than 0. For example, –147 and –4 are negative integers, but –0.4181554... and 10 are not (the former is a negative number but not an integer, the latter is a positive integer). The negative integers are listed in A001478, which can be thought of as the "negative equivalent" of A000027
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Positive Integers
http://oeis.org/wiki/Positive_integers
Quote:
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The positive integers (also called the counting numbers or the whole numbers) are most often what the set of natural numbers refers to, but not always. (Many authors consider zero to be a natural number, although it was not even a number for the ancient Greeks!)
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Zero
http://oeis.org/wiki/Zero
Quote:
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Zero is usually not considered to belong to the set N, of natural numbers, as it was not even considered a number by the ancient Greeks and Romans. The number zero is represented by the Hindu-Arabic numeral 0. As a digit, 0 is used as a placeholder in place-value numeral systems.
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