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HTML Class Attribute

The class attribute in HTML is used to assign one or more classes to an element. A class is a way of grouping and applying styles to one or more HTML elements. By assigning the same class to multiple elements, you can apply the same styles to all of them at once. Classes are used to group elements with similar styles or behaviors together, making it easier to apply CSS styles or JavaScript functionality to those elements.

The class attribute can be used on any HTML element, and its value is a space-separated list of class names. For example, you could add a class to a <div> element like this:

<div class="my-class">This is a div with a class</div>

In this example, the class attribute has a value of "my-class". You can then use CSS to apply styles to all elements with the "my-class" class.

You can also assign multiple classes to an element by separating them with spaces, like this:

<div class="class1 class2 class3">This is a div with multiple classes</div>

In this example, the class attribute has a value of "class1 class2 class3". You can then use CSS to apply styles to all elements with any of these classes.

Using the class attribute is a powerful way to add structure and consistency to your HTML and CSS. By grouping elements together with similar styles, you can easily make changes to your website's design without having to update every individual element.


Apply CSS style using class name

One of the main uses of the class attribute is to point to a class name in a style sheet. A style sheet is a file that defines how HTML elements should look on the web page. You can use a period (.) followed by the class name to select elements with that class in the style sheet. For example:

.my-class {
 background-color: tomato;
 color: white;
 border: 2px solid black;
 margin: 20px;
 padding: 20px;

This style sheet will apply the same style to all elements with the class "my-class". You can use any CSS property inside the curly braces to customize the appearance of the elements.


Manipulate class element using JavaScript

Another use of the class attribute is to access and manipulate elements with a specific class name using JavaScript. JavaScript is a programming language that can add interactivity and functionality to your web pages. You can use the document.getElementsByClassName() method to get a collection of elements with a given class name. For example:

var cities = document.getElementsByClassName("my-class");

This JavaScript code will store all elements with the class "my-class" in a variable called cities. You can then use a loop or an index to access each element and perform some actions on them.

The HTML class attribute is a powerful and flexible way of grouping and identifying HTML elements. You can use it to style, script, or select elements with ease. I hope this blog post has helped you understand what the HTML class attribute is and how to use it in your web pages.