fallback

Summary

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. 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 few scenarios where 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.

Related at-rule	`@counter-style`
Initial value	`decimal`
Media	all
Computed value	as specified
Canonical order	the unique non-ambiguous order defined by the formal grammar

Syntax

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

Formal syntax

<counter-style-name>where 
<counter-style-name> = <custom-ident>

Example

HTML Content

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

CSS Content

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

Result

Specifications

Specification	Status	Comment
CSS Counter Styles Level 3 The definition of 'fallback' in that specification.	Candidate Recommendation	Initial definition

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