The <number> CSS data type represents a number, being either an integer or a number with a fractional component.


The syntax of <number> extends the syntax of <integer>. A fractional value is represented by a . followed by one or more decimal digits, and may be appended to an integer. There is no unit associated with numbers.


When animated, values of the <number> CSS data type are interpolated as real, floating-point numbers. The speed of the interpolation is determined by the timing function associated with the animation.


Valid numbers

12          A raw <integer> is also a <number>.
4.01        Positive fraction
-456.8      Negative fraction
0.0         Zero
+0.0        Zero, with a leading +
-0.0        Zero, with a leading -
.60         Fractional number without a leading zero
10e3        Scientific notation
-3.4e-2     Complicated scientific notation

Invalid numbers

12.         Decimal points must be followed by at least one digit.
+-12.2      Only one leading +/- is allowed.
12.1.1      Only one decimal point is allowed.


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

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support1 Yes15 Yes1
Scientific notation43 Yes2911 ? ?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes Yes Yes Yes Yes Yes ?
Scientific notation Yes Yes Yes Yes Yes Yes ?

See also

Document Tags and Contributors

 Last updated by: fscholz,