- CSS Introduction
- CSS Syntax
- CSS Selectors
- How To Add CSS
- CSS Comments
- CSS Backgrounds
- CSS Borders
- CSS Margins
- CSS Padding
- CSS Height - Width
- CSS Box Model
- CSS Outline
- CSS Text
- CSS Links
- CSS Lists
- CSS Tables
- CSS Display
- CSS Max-width
- CSS Position
- CSS Overflow
- CSS Float
- CSS Inline-block
- CSS Align
- CSS Combinators
- CSS Pseudo-classes
- CSS Pseudo-elements
- CSS Opacity
- CSS Navigation Bar
- CSS Dropdowns
- CSS Image Gallery
- CSS Attr Selectors
- CSS Forms
- CSS Counters
- CSS Website Layout
- CSS !important
- CSS Rounded Corners
- CSS Border Images
- CSS Backgrounds
- CSS Colors
- CSS Color Keywords
- CSS Gradients
- CSS Radial Gradients
- CSS Text Effects
- CSS Web Fonts
- CSS 2D Transforms
- CSS 3D Transforms
- CSS Transitions
- CSS Animations
- CSS Tooltip
- CSS Image Reflection
- CSS The Object-fit
- CSS Object-position
- CSS Button
- CSS Pagination
- CSS Multiple Columns
- CSS User Interface
- CSS Variables
- CSS Box-sizing
- CSS Media Queries
- CSS Flexbox
CSS Counters
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 countercounter-increment
- Increments a counter valuecontent
- Inserts generated contentcounter()
orcounters()
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:
<html>
<head>
<style>
body {
counter-reset: section;
}
h2::before {
counter-increment: section;
content: "Section " counter(section) ": ";
}
</style>
</head>
<body>
<h1>Using CSS Counters:</h1>
<h2>HTML Tutorial</h2>
<h2>CSS Tutorial</h2>
<h2>JavaScript Tutorial</h2>
</body>
</html>
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>":
<html>
<head>
<style>
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) " ";
}
</style>
</head>
<body>
<h1>HTML tutorials:</h1>
<h2>HTML Tutorial</h2>
<h2>CSS Tutorial</h2>
<h1>Scripting tutorials:</h1>
<h2>JavaScript</h2>
<h2>VBScript</h2>
<h1>XML tutorials:</h1>
<h2>XML</h2>
<h2>XSL</h2>
</body>
</html>
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