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CSS Counters




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CSS counters are "variables" maintained by CSS whose values can
be incremented by CSS rules (to track how many times they are used). Counters
let you adjust the appearance of content based on its placement in the document.

Automatic Numbering With Counters
CSS counters are like "variables". The variable values can be incremented by CSS rules
(which will
track how many times they are used).
To work with CSS counters we will use the following properties:

counter-reset - Creates or resets a counter
counter-increment - Increments a counter value
content - Inserts generated
content
counter() or counters() function - Adds the
value of a counter to an element

To use a CSS counter, it must first be created with counter-reset.
The following example creates a counter for the page (in the body selector),
then increments the counter value for each <h2> element and adds "Section <value of the counter>:"
to the beginning of each <h2> element:

Example

body {  counter-reset: section;}h2::before {  counter-increment: section;  content: "Section " counter(section) ": ";}

Try it Yourself »








Nesting Counters
The following example creates one counter for the page (section) and one
counter for each <h1> element (subsection). The "section" counter will be
counted for each <h1> element with "Section <value of the
section counter>.", and the "subsection" counter will be counted
for each <h2> element with "<value of the section counter>.<value of the
subsection counter>":

Example

body {  counter-reset: section;}h1 { 
counter-reset: subsection;}h1::before {  counter-increment:
section;  content: "Section " counter(section) ". ";
}h2::before { 
counter-increment: subsection;  content:
counter(section) "." counter(subsection) " ";}
Try it Yourself »

A counter can also be useful to make outlined lists because a new
instance of a counter is automatically created in child elements. Here we use the
counters() function to insert a string between different levels of nested
counters:

Example

ol {  counter-reset: section; 
list-style-type: none;}
li::before {  counter-increment: section; 
content: counters(section,".") " ";}
Try it Yourself »


 CSS Counter Properties


Property
Description


content
Used with the ::before and ::after pseudo-elements, to insert generated content


counter-increment
Increments one or more counter values


counter-reset
Creates or resets one or more counters


counter()
Returns the current value of the named counter














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Reference: https://www.w3schools.com/css/css_counters.asp