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In jQuery, you can manipulate CSS classes in HTML elements using several methods provided by the library. The following are some common methods for working with CSS classes using jQuery:
### 1. **addClass() Method:**
The `addClass()` method adds one or more classes to the selected elements.
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>jQuery Add Class Example</title>
<style>
.highlight {
color: red;
}
</style>
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
</head>
<body>
<p id="myParagraph">This is a paragraph.</p>
<script>
$(document).ready(function () {
// Add the 'highlight' class to the paragraph
$("#myParagraph").addClass("highlight");
});
</script>
</body>
</html>
```
### 2. **removeClass() Method:**
The `removeClass()` method removes one or more classes from the selected elements.
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>jQuery Remove Class Example</title>
<style>
.highlight {
color: red;
}
</style>
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
</head>
<body>
<p id="myParagraph" class="highlight">This is a highlighted paragraph.</p>
<script>
$(document).ready(function () {
// Remove the 'highlight' class from the paragraph
$("#myParagraph").removeClass("highlight");
});
</script>
</body>
</html>
```
### 3. **toggleClass() Method:**
The `toggleClass()` method adds a class if it's not present and removes it if it's already present.
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>jQuery Toggle Class Example</title>
<style>
.highlight {
color: red;
}
</style>
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
</head>
<body>
<p id="myParagraph">This is a paragraph.</p>
<script>
$(document).ready(function () {
// Toggle the 'highlight' class on the paragraph
$("#myParagraph").toggleClass("highlight");
});
</script>
</body>
</html>
```
These examples demonstrate the basic usage of `addClass()`, `removeClass()`, and `toggleClass()` methods in jQuery for manipulating CSS classes. Depending on your requirements, you can use these methods to dynamically change the styling of HTML elements based on user interactions, events, or other conditions.
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