CSS Counters
CSS Counters
With CSS counters, you can create dynamic numbering of elements (like headings, sections, or list items) without using JavaScript.
CSS counters are "variables" maintained by CSS, and their values can be incremented (or decremented) by CSS rules.
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CSS Automatic Numbering With Counters
CSS counters are like "variables". The variable values can be incremented (or decremented) by CSS rules.
To work with CSS counters we will use the following properties:
counter-reset- Creates or resets a countercounter-increment- Increments or decrements a countercontent- Inserts generated contentcounter()- Adds the value of a counter to an element
To use a CSS counter, it must first be created with the
counter-reset property.
CSS Increase and Decrease Counter
The following example creates a counter for the page (in the body selector), then it increments the counter value by 1 for each <h2> element:
Example
body {
counter-reset: section;
}
h2::before {
counter-increment: section;
content: "Section " counter(section) ": ";
}
Try it Yourself »
Decrementing a Counter
The counter-increment
property has a second parameter. The default value is 1. To decrease the counter value, you can set it to
-1.
Example
body {
counter-reset: section;
}
h2::before {
counter-increment: section
-1;
content: "Section " counter(section) ": ";
}
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Incrementing by Custom Values
You can increment the counter by any value. Here we increment by 2:
Example
body {
counter-reset: section;
}
h2::before {
counter-increment: section
2;
content: "Section " counter(section) ": ";
}
Try it Yourself »
