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additive-symbols

The additive-symbols descriptor lets you specify symbols when the value of a counter system descriptor is additive. The additive-symbols descriptor defines additive tuples, each of which is a pair containing a symbol and a non-negative integer weight. The additive system is used to construct sign-value numbering systems such as Roman numerals.

Syntax

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

When the system descriptor is cyclic, numeric, alphabetic, symbolic, or fixed, use the symbols() descriptor instead of additive-symbols.

Formal definition

Related at-rule	`@counter-style`
Initial value	`n/a (required)`
Computed value	as specified

Formal syntax

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

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

<image> = 
  <url>       |
  <gradient>  

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

Examples

Specifying additive symbols

HTML

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

CSS

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

Result

Specifications

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

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`additive-symbols`	91	91	33	No	77	No	91	91	33	64	No	16.0