W3cubDocs

/CSS

fallback

The fallback descriptor can be used to specify a counter style to fall back to if the current counter style cannot create a marker representation for a particular counter value.

Syntax

/* Keyword values */
fallback: lower-alpha;
fallback: custom-gangnam-style;

Description

If the specified fallback style is also unable to construct a representation, then its fallback style will be used. If a valid fallback style is not specified, it defaults to decimal.

A couple of scenarios where a fallback style will be used are:

When the range descriptor is specified for a counter style, the fallback style will be used to represent values that fall outside the range.
When the fixed system is used and there are not enough symbols to cover all the list items, the fallback style will be used for the rest of the list items.

Formal definition

Related at-rule	`@counter-style`
Initial value	`decimal`
Computed value	as specified

Formal syntax

fallback = 
  <counter-style-name>

Examples

Specifying a fallback counter style

HTML

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

CSS

@counter-style fallback-example {
  system: fixed;
  symbols: "\24B6""\24B7""\24B8";
  fallback: upper-alpha;
}

.list {
  list-style: fallback-example;
}

Result

Specifications

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

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
`fallback`	91	91	33	No	77	No	91	91	33	64	No	16.0