<number>

<number> 的语法扩展了 <integer> 的语法。小数部分由一个 . 后面跟着一个或多个十进制数字表示，可以附加到整数后面。数字没有单位。

动画时，<number> CSS 数据类型的数值被插值为真实的浮点数。插值的速率由与动画关联的 缓动函数 决定。

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.

• <整数>