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.


Browser compatibilityUpdate compatibility data on GitHub

Chrome Edge Firefox Internet Explorer Opera Safari
<number> 1 12 1 5 2 1
Scientific notation 43 12 29 11 30 10.1
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
<number> 1 18 4 10.1 1 1.0
Scientific notation 43 43 29 30 10.3 4.0

See also

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