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Showing content from https://developer.mozilla.org/en-US/docs/Web/CSS/number below:

<number> - CSS | MDN

Syntax

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. 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.

Interpolation

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.

Examples 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.
Specifications Browser compatibility

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