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The <integer> CSS data type denotes an integer number, positive or negative. There isn't any associated unit with the value. An integer consists of one or several decimal digit, 0 to 9, eventually preceded by one single + or - sign.

Integers are used in numerous CSS properties, e. g. z-index , line-height , counter-increment , column-count .

Also any <integer> CSS value is also a <number> CSS value, though the converse is not true.

There is no absolute range for <integer> values, but the specification requests that integer values in the range [-224-1; 224-1] must be supported. [1]


Values of the <integer> CSS data type can be interpolated in order to allow animations. In that case they are interpolated via integer discrete steps. The calculation is done as if they were real, floating-point, numbers and the discrete value is obtained using the floor function. [2] The speed of the interpolation is determined by the timing function associated with the animation.


These are valid integer values:

12          Positive integer (without a leading + sign)
+123        Positive integer (with a leading + sign)
-456        Negative integer
0           Zero
+0          Zero, with a leading +
-0          Zero, with a leading - (Though strange, this is an allowed value)

These are invalid integer values:

12.0        This is a <number>, not an <integer>, though it represents an integer
12.         The dot should not be part of an <integer>
+---12      Only one leading +/- is allowed
ten         Letters are not allowed
_5          Special characters are not allowed
\35         Escaped Unicode characters are not allowed, even if they are an integer (here: 5)
\4E94       Non-arabic numerals are not allowed, even escaped (here: the Japanese 5, 四)


Specification Status Comment
CSS Values and Units Level 3 Working Draft No significant change from CSS Level 2 (Revision 1)
CSS Level 2 (Revision 1) Recommendation Explicitly defined
CSS Level 1 Recommendation Implicitly defined

Browser Compatibility

  • Desktop
  • Mobile

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
basic 1.0 1.0 (1.0) 3.0 yes 1.0 (85)
Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support yes yes yes yes yes

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