CSS counter-set Property
Example
Create a counter ("my-counter"), set it to 5, and increase it by one for each occurrence of the <h2> selector:
body {
/* Set "my-counter" to 5 */
counter-set: my-counter 5;
}
h2::before {
/* Increment "my-counter" by 1 */
counter-increment:
my-counter;
content: "Section "
counter(my-counter) ". ";
}
Try it Yourself »
More "Try it Yourself" examples below.
Definition and Usage
The counter-set property creates and sets a CSS counter
to a specific value.
The counter-set property is usually used together with the
counter-increment property and the
content property.
| Default value: | none |
|---|---|
| Inherited: | no |
| Animatable: | no. Read about animatable |
| Version: | CSS2 |
| JavaScript syntax: | object.style.counterSet="4" Try it |
Browser Support
The numbers in the table specify the first browser version that fully supports the property.
| Property | |||||
|---|---|---|---|---|---|
| counter-set | 85.0 | 85.0 | 68.0 | Not supported | 71.0 |
CSS Syntax
counter-set: none|counter-name number|initial|inherit;
Property Values
| Value | Description |
|---|---|
| none | Default value. No counter set is to be performed |
| counter-name number | The name of the counter to set and the value to set the counter to on each occurrence of the selector. The default number value is 0 |
| initial | Sets this property to its default value. Read about initial |
| inherit | Inherits this property from its parent element. Read about inherit |
More Examples
Example
Create a counter ("my-counter"), set it to 5, and decrease it by one for each occurrence of the <h2> selector:
body {
/* Set "my-counter" to 5 */
counter-set: my-counter 5;
}
h2::before {
/* Decrement "my-counter" by 1 */
counter-increment:
my-counter -1;
content: "Section "
counter(my-counter) ". ";
}
Try it Yourself »
Example
Numbering sections and sub-sections with "Section 10:", "10.1", "10.2", etc.:
body
{
/* Set "section" to 9 */
counter-set: section 9;
}
h1
{
/* Set "subsection" to 0 */
counter-set: subsection 0;
}
h1::before
{
/* Increment "section" by 1 */
counter-increment: section;
content: "Section " counter(section) ": ";
}
h2::before {
/* Increment "subsection" by 1 */
counter-increment: subsection;
content: counter(section) "." counter(subsection) " ";
}
Try it Yourself »
Example
Create a counter, set it to 9, and increase it by one (using Roman numerals) for each occurrence of the <h2> selector:
body {
/* Set "my-counter" to 9 */
counter-set: my-counter 9;
}
h2::before {
/* Increment "my-counter" by 1 */
counter-increment:
my-counter;
content: counter(my-counter,
upper-roman) ". ";
}
Try it Yourself »
Related Pages
CSS reference: ::before pseudo element
CSS reference: ::after pseudo element
CSS reference: content property
CSS reference: counter-increment property
CSS functions: counter() function