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The <integer> CSS data type is a special type of number that represents a whole number, whether positive or negative. Integers can be used in numerous CSS properties, such as column-count, counter-increment, grid-column, grid-row, and z-index.

语法

The <integer> data type consists of one or several decimal digits, 0 through 9 inclusive, optionally preceded by a single + or - sign. There is no unit associated with integers.

Note: There is no official range of valid <integer> values. Opera 12.1 supports values up to 215-1, IE up to 220-1, and other browsers even higher. During the CSS3 Values cycle there was a lot of discussion about setting a minimum range to support: the latest decision, in April 2012 during the LC phase, was [-227-1; 227-1], but other values like 224-1 and 230-1 were also proposed. However, the latest spec doesn't specify a range anymore.

Interpolation

When animated, values of the <integer> data type are interpolated using discrete, whole steps. The calculation is done as if they were real, floating-point numbers; the discrete value is obtained using the floor function. The speed of the interpolation is determined by the timing function associated with the animation.

示例

合法整型

12          Positive integer (without a leading + sign)
+123        Positive integer (with a leading + sign)
-456        Negative integer
0           Zero
+0          Zero, with a leading +
-0          Zero, with a leading -

非法整型

12.0        This is a <number>, not an <integer>, though it represents an integer.
12.         Decimal points are not allowed.
+---12      Only one leading +/- is allowed.
ten         Letters are not allowed.
_5          Special characters are not allowed.
\35         Escaped Unicode characters are not allowed, even if they are an integer (here: 5).
\4E94       Non-arabic numerals are not allowed, even when escaped (here: the Japanese 5, 五).
3e4         Scientific notation is not allowed.

规范

Specification Status Comment
CSS Values and Units Module Level 3
<integer>
Candidate Recommendation No significant change.
CSS Level 2 (Revision 1)
<integer>
Recommendation Explicit definition.
CSS Level 1
<integer>
Recommendation Implicit definition.

浏览器兼容性

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
basic 1.0 1.0 (1.7 or earlier) 3.0 (Yes) 1.0 (85)
Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes) (Yes) (Yes)

参考

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