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HTML Class Attribute

HTML class attributes are used to specify one or more class names for an HTML element.

Multiple HTML elements can share the same class, and the class name can be used by CSS and JavaScript to perform certain tasks for elements with the specified class name.

How to Add Class Attributes in HTML

Here is an example of how to add a class attribute to an HTML element:

<p class="my-class">This is a paragraph.</p>

The class attribute specifies the name of the class, which can be used to style the element using CSS or manipulate it using JavaScript.

Using Class Attributes in CSS

CSS can be used to style elements with a specific class name using the .class-name selector. Here is an example of how to style a paragraph with a class name using CSS:

.my-class {
  color: red;
  font-size: 16px;
}

Using Class Attributes in JavaScript

JavaScript can access elements with a specific class name using the getElementsByClassName() method. Here is an example of how to manipulate elements with a class name using JavaScript:

var elements = document.getElementsByClassName("my-class");
for (var i = 0; i < elements.length; i++) {
  elements[i].style.color = "blue;
}

Importance of Class Attributes

  • Class attributes can be used to group related elements and apply styles or functionality to them.
  • Class attributes can be used to create reusable styles and functionality across multiple pages on a website.
  • Search engines use class attributes to index the structure and content of web pages.
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