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(Cascading Style Sheets) CSS 2.1 Reference

Number Values

Numbers are decimal values that may or may not contain a decimal point. Numbers are comprised of one or more of the following digits: 0 thru 9. Examples: 12.5 and 62. A plus sign (+) or minus sign (-) can precede the number to indicate its sign. Examples: -15.3 and -24.

Some properties may restrict number values. There may be property values, for example, that only allow positive numbers.