Class vs Id

Class and ID are two different attributes used in HTML and CSS to select and style elements on a web page. They have distinct purposes and use cases:

1. Class:

• The class attribute is used to group elements with similar properties, allowing you to apply the same CSS styles to multiple elements.
• A class name can be reused on different elements throughout the HTML document.
• You can assign multiple class names to a single element, separated by spaces. This allows an element to belong to multiple class-based groups.
• In CSS, you select elements with a specific class using the class selector (.classname).

HTML Example:

<p class="highlight-text">This is a paragraph with a highlighted text.</p>
<p class="highlight-text">Another paragraph with a highlighted text.</p>

CSS Example:

.highlight-text {
  color: blue;
  font-weight: bold;
}

In this example, both paragraphs will be styled with the specified CSS properties since they share the same highlight-text class.

2. ID:

• The id attribute is used to uniquely identify a single element on a web page.
• An element can have only one unique ID within the entire HTML document. IDs must be unique.
• IDs are typically used when you need to apply specific styles or JavaScript functionality to a particular element.
• In CSS, you select an element with a specific ID using the ID selector (#idname).

HTML Example:

<h1 id="main-heading">Main Heading</h1>

CSS Example:

#main-heading {
  color: red;
  font-size: 24px;
}

In this example, the CSS styles will be applied specifically to the element with the ID main-heading.

To summarize, use classes when you want to apply the same styles to multiple elements, and use IDs when you want to uniquely identify a single element for specific styling or JavaScript manipulation. As a best practice, it’s generally a good idea to use classes for styling common elements and IDs for elements that require unique styles or functionality.