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The ::before and ::after Pseudo-element in CSS
The CSS ::before and ::after pseudo-elements are used to insert content before and after an element's actual content, respectively. These pseudo-elements create virtual elements that can be styled and positioned like regular HTML elements.
Syntax
element::before {
content: "text or value";
/* other styles */
}
element::after {
content: "text or value";
/* other styles */
}
Key Points
- The
contentproperty is required for pseudo-elements to appear - Content can be text, images, or empty strings
- Pseudo-elements are inline by default but can be styled as block elements
- They inherit from their parent element
Example 1: Using ::after Pseudo-element
The following example adds content after paragraph elements −
<!DOCTYPE html>
<html>
<head>
<style>
p {
background-color: #2196F3;
color: white;
padding: 10px;
margin: 5px 0;
}
p::after {
content: " ?";
background-color: #FF5722;
padding: 5px;
font-weight: bold;
margin-left: 10px;
}
</style>
</head>
<body>
<h2>Favorite Sports</h2>
<p>Football</p>
<p>Basketball</p>
</body>
</html>
Two blue paragraphs appear with "Football" and "Basketball" text, each followed by a red star symbol with orange background.
Example 2: Using ::before Pseudo-element
The following example adds content before paragraph elements −
<!DOCTYPE html>
<html>
<head>
<style>
.quote {
background-color: #f0f0f0;
padding: 15px;
margin: 10px 0;
border-left: 4px solid #4CAF50;
}
.quote::before {
content: "? ";
font-size: 1.2em;
color: #4CAF50;
}
</style>
</head>
<body>
<div class="quote">Success is not final, failure is not fatal.</div>
<div class="quote">It is the courage to continue that counts.</div>
</body>
</html>
Two gray quote boxes appear with green left borders, each prefixed with a green speech bubble emoji.
Example 3: Creating Decorative Elements
This example demonstrates creating a simple tooltip using both pseudo-elements −
<!DOCTYPE html>
<html>
<head>
<style>
.tooltip {
position: relative;
display: inline-block;
background-color: #007BFF;
color: white;
padding: 10px;
cursor: pointer;
border-radius: 5px;
}
.tooltip::before {
content: "Click me for info";
position: absolute;
bottom: 125%;
left: 50%;
transform: translateX(-50%);
background-color: #333;
color: white;
padding: 8px;
border-radius: 4px;
font-size: 14px;
opacity: 0;
transition: opacity 0.3s;
}
.tooltip::after {
content: "";
position: absolute;
bottom: 115%;
left: 50%;
transform: translateX(-50%);
border: 5px solid transparent;
border-top-color: #333;
opacity: 0;
transition: opacity 0.3s;
}
.tooltip:hover::before,
.tooltip:hover::after {
opacity: 1;
}
</style>
</head>
<body>
<p>Hover over the button below:</p>
<div class="tooltip">Hover Me</div>
</body>
</html>
A blue button appears. When hovered, a dark tooltip with white text and a small arrow appears above it.
Conclusion
The ::before and ::after pseudo-elements are powerful tools for adding decorative content and UI elements without cluttering your HTML. They require the content property and can be styled just like regular elements.
Updated on: 2026-03-15T14:01:06+05:30
569 Views
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