files/en-us/web/css/reference/values/number/index.md
The <number> CSS data type represents a number, being either an integer, a number with a fractional component, or a base-ten exponent in scientific notation.
The syntax of <number> extends the syntax of {{CSSxRef("<integer>")}}. A fractional value is represented by a . followed by one or more decimal digits, and may be appended to an integer. A <number> can also end with the letter e or E followed by an integer, which indicates a base-ten exponent in scientific notation. There is no unit associated with numbers.
As with integers, the first character of the number can be immediately preceded by - or + to indicate the number's sign: whether the number is positive or negative.
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 easing function associated with the animation.
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
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.
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