CSS参考手册
计数器样式 | Counter Styles
@counter-style.pad
pad
当需要标记表示具有最小长度时,描述符可以用于自定义计数器样式定义。如果标记表示小于指定的填充长度,则标记将填充指定的填充符号。比标记长度更长的标记表示是正常的。填充描述符将最小标记长度作为整数,将用于填充的符号作为第二个参数。pad描述符的一个常见用法是当你需要你的列表从01开始编号,然后经过02,03等,而不是只有1,2,3。
Related at-rule |
@counter-style |
---|---|
初始值 |
0 "" |
适用媒体 |
all |
计算值 |
as specified |
正规顺序 |
the unique non-ambiguous order defined by the formal grammar |
语法
pad: 3 "0";
值
<integer> && <symbol>
在<integer>
指定所有计数器表示必须达到的最小长度。该值必须是非负的。如果未达到最小长度,则将使用指定填充表示法<symbol>
。
正式语法
<integer> && <symbol>where
<symbol> = <string> | <image> | <ident>
where
<image> = <url> | <image()> | <image-set()> | <element()> | <cross-fade()> | <gradient>
where
<image()> = image( [ [ <image> | <string> ]? , <color>? ]! )
<image-set()> = image-set( <image-set-option># )
<element()> = element( <id-selector> )
<cross-fade()> = cross-fade( <cf-mixing-image> , <cf-final-image>? )
<gradient> = <linear-gradient()> | <repeating-linear-gradient()> | <radial-gradient()> | <repeating-radial-gradient()>
where
<color> = <rgb()> | <rgba()> | <hsl()> | <hsla()> | <hex-color> | <named-color> | currentcolor | <deprecated-system-color>
<image-set-option> = [ <image> | <string> ] <resolution>
<cf-mixing-image> = <percentage>? && <image>
<cf-final-image> = <image> | <color>
<linear-gradient()> = linear-gradient( [ <angle> | to <side-or-corner> ]? , <color-stop-list> )
<repeating-linear-gradient()> = repeating-linear-gradient( [ <angle> | to <side-or-corner> ]? , <color-stop-list> )
<radial-gradient()> = radial-gradient( [ <ending-shape> || <size> ]? [ at <position> ]? , <color-stop-list> )
<repeating-radial-gradient()> = repeating-radial-gradient( [ <ending-shape> || <size> ]? [ at <position> ]? , <color-stop-list> )
where
<rgb()> = rgb( [ [ <percentage>{3} | <number>{3} ] [ / <alpha-value> ]? ] | [ [ <percentage>#{3} | <number>#{3} ] , <alpha-value>? ] )
<rgba()> = rgba( [ [ <percentage>{3} | <number>{3} ] [ / <alpha-value> ]? ] | [ [ <percentage>#{3} | <number>#{3} ] , <alpha-value>? ] )
<hsl()> = hsl( [ <hue> <percentage> <percentage> [ / <alpha-value> ]? ] | [ <hue>, <percentage>, <percentage>, <alpha-value>? ] )
<hsla()> = hsla( [ <hue> <percentage> <percentage> [ / <alpha-value> ]? ] | [ <hue>, <percentage>, <percentage>, <alpha-value>? ] )
<side-or-corner> = [ left | right ] || [ top | bottom ]
<color-stop-list> = <color-stop>#{2,}
<ending-shape> = circle | ellipse
<size> = closest-side | farthest-side | closest-corner | farthest-corner | <length> | <length-percentage>{2}
<position> = [[ left | center | right | top | bottom | <length-percentage> ] | [ left | center | right | <length-percentage> ] [ top | center | bottom | <length-percentage> ] | [ center | [ left | right ] <length-percentage>? ] && [ center | [ top | bottom ] <length-percentage>? ]]
where
<alpha-value> = <number> | <percentage>
<hue> = <number> | <angle>
<color-stop> = <color> <length-percentage>?
<length-percentage> = <length> | <percentage>
示例
HTML
<ul class="list">
<li>One</li>
<li>Two</li>
<li>Three</li>
<li>Four</li>
<li>Five</li>
</ul>
CSS
@counter-style pad-example {
system: numeric;
symbols: "0" "1" "2" "3" "4" "5";
pad: 2 "0";
}
.list {
list-style: pad-example;
}
结果
规范
Specification |
Status |
Comment |
---|---|---|
CSS Counter Styles Level 3The definition of 'pad' in that specification. |
Candidate Recommendation |
Initial definition |
浏览器兼容性
Feature |
Chrome |
Firefox (Gecko) |
Internet Explorer |
Opera |
Safari |
---|---|---|---|---|---|
Basic support |
No support |
33 (33) |
No support |
No support |
No support |
Feature |
Android |
Firefox Mobile (Gecko) |
IE Mobile |
Opera Mobile |
Safari Mobile |
---|---|---|---|---|---|
Basic support |
No support |
33 (33) |
No support |
No support |
No support |
计数器样式 | Counter Styles相关
层叠样式表( Cascading Style Sheets )是一种用来表现 HTML 或 XML 等文件样式的计算机语言。CSS 不仅可以静态地修饰网页,还可以配合各种脚本语言动态地对网页各元素进行格式化。