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The <number> CSS data type represents a number, either integer or fractional. Its syntax extends the one of the <integer> data value. To represent a fractional value, add the fractional part — a '.' followed by one or several decimal digits — to any <integer> data value. Like for <integer> data type, there isn't any unit associated to a <number>, which is not a CSS dimension.


Values of the <number> CSS data type can be interpolated in order to allow animations. In that case they are interpolated as real, floating-point, numbers. The speed of the interpolation is determined by the timing function associated with the animation.


These are valid number values:

12          A raw <integer> is also a <number>
4.01        A positive non-integer <number>
-456.8      Negative non-integer <number>
0.0         Zero
+0.0        Zero, with a leading +
-0.0        Zero, with a leading - (Though strange, this is an allowed value)
.60         Digits are optional before the dot
10e3        The scientific notation is allowed
-3.4e-2     Most complex case of scientific notation

These are invalid number values:

12.         The dot should be followed by a number
+-12.2      Only one leading +/- is allowed
12.1.1      Only one dot is allowed


Specification Status Comment
CSS Values and Units Module Level 3
The definition of '<number>' in that specification.
Candidate Recommendation No significant change from CSS Level 2 (Revision 1)
CSS Level 2 (Revision 1)
The definition of '<number>' in that specification.
Recommendation Explicitly defined
CSS Level 1
The definition of '<number>' in that specification.
Recommendation Implicitly defined

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 1.0 1.0 (1.0) 5.0 (Yes) 1.0 (85)
Scientific notation 43.0 29 11 ? ?
Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes) (Yes) (Yes)
Scientific notation (Yes) (Yes) (Yes) (Yes) (Yes)

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 Last updated by: Sebastianz,