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counter-reset

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The counter-reset property allows for automatic numbering of elements. Like an ordered list (<ol>), but it works on any element. It is particularly useful in creating a table of contents or numbering headings for something like a thesis paper. The counters are applied via the content property. A simple example:

article {
  counter-reset: section;
}
section {
  counter-increment: section;
}
section h2:before {
  content: counter(section) '. ';
}

The counter-reset property is used to reset a CSS counter to a given value.

It is part of the CSS counter module which is part of the generated content, automatic numbering, and lists CSS2.1 specification, extended in Generated and Replaced Content Module CSS3 specification.

Syntax

counter-reset: [<user-ident> <integer>?]+ | none

Where...

  • <user-ident> is the name of the counter you want to reset
  • <integer> is the value to reset the counter to
  • none disable the counter
body {
  counter-reset: my-awesome-counter 0;
}

Note: the default value for the integer is 0. If no integer is set after the counter name, it will be reseted to 0. Thus, this works as expected:

body {
  counter-reset: my-awesome-counter;
}

You can reset several counters at once with a space-separated list, each one with its specific value if you wish so.

body {
  counter-reset: my-awesome-counter 5 my-other-counter;
}

This will reset my-awesome-counter to 5 and my-other-counter to the default value: 0.

You can see this list as: counter1 value1 counter2 value2 counter3 value3 .... If a value is omitted, it's 0.

Demo

In the following demo, article resets section counter to its default value (0), which is then incremented at each section occurrence, then displayed in front of section headings.

Check out this Pen!

Related properties

More Information

Browser Support

Chrome Safari Firefox Opera IE Android iOS
2+ 3.1+ Any 9.2+ 8+ Any Any

Comments

  1. Very useful! Thanks!!!

  2. Permalink to comment#

    Always learn a lot from CSS-Tricks.
    With counter-reset and this useful nth-child tip, I was able to make double digit ordered lists.

    With something along these lines…

    ol {
        counter-reset: li;
    }
    
    ol > li::before {
        content: counter(li);
        counter-increment: li;
        margin-right: 10px;
        line-height: 0;
    }
    
    ol > li:nth-child(-n+9)::before { /* 1 - 9 */
        content: "0" counter(li); /* becomes 01 - 09 */
    }
    

    I get the output:

    01 one
    02 two
    03 three
    04 four
    05 five
    06 six
    07 seven
    08 eight
    09 nine
    10 ten
    

    PS: Chris, you need to fix the padding on your ordered lists (gets cut off starting with double digits):

    one
    two
    three
    four
    five
    six
    seven
    eight
    nine
    ten
    eleven
    twelve
    thirtheen

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