additive-symbols

Baseline 2023
Newly available

Since September 2023, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.

additive-symbols 描述符定义符号,用于值可累积的可数的 system的项。 additive-symbols 定义累积的元组(tuples),每个元组项都包含一个符号和一个非负整数的权重。additive system 被用于构造 sign-value numbering (符号 - 值,指数字的值就是是符号加在一起的值)系统,比如罗马数字。

css
additive-symbols: 3 "0";
additive-symbols:
  3 "0",
  2 "\2E\20";
additive-symbols:
  3 "0",
  2 url(symbol.png);

当系统描述符是循环,数字,拼音,象征,或固定的时候,使用 symbols()代替additive-symbols

Related at-rule@counter-style
初始值n/a (required)
计算值as specified

语法

Formal syntax

additive-symbols = 
[ <integer [0,∞]> && <symbol> ]#

<symbol> =
<string> |
<image> |
<custom-ident>

<image> =
<url> |
<gradient>

<url> =
<url()> |
<src()>

<url()> =
url( <string> <url-modifier>* ) |
<url-token>

<src()> =
src( <string> <url-modifier>* )

示例

HTML

html
<ul class="list">
  <li>One</li>
  <li>Two</li>
  <li>Three</li>
  <li>Four</li>
  <li>Five</li>
</ul>

CSS

css
@counter-style additive-symbols-example {
  system: additive;
  additive-symbols:
    V 5,
    IV 4,
    I 1;
}
.list {
  list-style: additive-symbols-example;
}

结果

规范

Specification
CSS Counter Styles Level 3
# counter-style-symbols

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
additive-symbols

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support

相关链接